WO2025135119A1 - Light radiation device - Google Patents

Abstract

Provided is a light radiation device with which it is possible to indicate a light radiation direction. The light radiation device has an elongated shape having a longitudinal direction and comprises a light emission part and a marker member that is directly or indirectly connected to the light emission part and is radiopaque. The marker member as viewed from a first direction in a direction orthogonal to the longitudinal direction differs in at least one among shape and position from the marker member as viewed from a second direction differing from the first direction in a direction orthogonal to the longitudinal direction, and it is possible to radiate light emitted from the light emission part in a predetermined direction crossing the longitudinal direction.

Description

Light Irradiation Device

This disclosure relates to a light irradiation device.

For example, Patent Document 1 discloses a light irradiation device that has a radiopaque marker portion and can selectively irradiate light to a specific position within a biological lumen.

JP 2020-185259 A

One aspect of the present disclosure aims to provide a light irradiation device that can indicate the direction of light irradiation.

In one embodiment, the light irradiation device is an elongated light irradiation device having a longitudinal direction, and includes a light emitting section and a radiopaque marker member that is directly or indirectly connected to the light emitting section, and the marker member viewed from a first direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker member viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction, and the light emitted from the light emitting section can be irradiated in a predetermined direction intersecting the longitudinal direction.

In one embodiment, the light irradiation device is an elongated light irradiation device having a longitudinal direction, and includes a light emitting section, a support to which the light emitting section is fixed, and a radiopaque marker section, in which the marker section viewed from a first direction perpendicular to the longitudinal direction differs in at least one of shape and position from the marker section viewed from a second direction perpendicular to the longitudinal direction that is different from the first direction, and the marker section is provided on the support, and is capable of irradiating light emitted from the light emitting section in a predetermined direction intersecting the longitudinal direction.

It is possible to provide a light irradiation device that can indicate the direction of light irradiation.

FIG. 2 is a schematic perspective view showing a configuration example of the light irradiation device according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing a first example of the configuration of the light irradiation device according to the first embodiment. FIG. 4 is a schematic cross-sectional view showing a second example of the configuration of the light irradiation device according to the first embodiment. 3 is a diagram showing a marker member included in the light irradiation device of the first embodiment, viewed from a first direction. FIG. 13 is a diagram showing the marker member included in the light irradiation device of the first embodiment as viewed from a second direction. FIG. FIG. 11 is a schematic cross-sectional view showing a configuration example of a light irradiation device according to a second embodiment. FIG. 13 is a schematic bottom view showing a configuration example of a light irradiation device according to a second embodiment. 4B is a schematic cross-sectional view showing a state in which the light irradiation device is rotated 180 degrees from the state shown in FIG. 4A around a central axis of the light irradiation device parallel to the longitudinal direction as a rotation axis. FIG. FIG. 13 is a schematic cross-sectional view showing a configuration example of a light irradiation device according to a third embodiment. FIG. 13 is a schematic cross-sectional view showing a configuration example of a light irradiation device according to a fourth embodiment. FIG. 13 is a schematic cross-sectional view showing a configuration example of a light irradiation device according to a fifth embodiment. FIG. 13 is a schematic bottom view showing a configuration example of a light irradiation device according to a fifth embodiment. FIG. 13 is a schematic cross-sectional view showing a configuration example of a light irradiation device according to a sixth embodiment. FIG. 13 is a schematic perspective view showing a configuration example of a light irradiation device according to a seventh embodiment. FIG. 23 is a diagram showing an example of an in vivo light irradiation assembly using the light irradiation device of the eighth embodiment. FIG. 13 is a schematic diagram showing a configuration example of a light irradiation device according to an eighth embodiment. 13 is a schematic diagram showing another configuration example of the light irradiation device according to the eighth embodiment. FIG. FIG. 2 is a perspective view of the light irradiation device body before being sealed with an insulating layer. FIG. 2 is a schematic diagram of a light-emitting element mounted on a support. 1 is a schematic diagram showing an example of lamination of a support and a light-emitting element. FIG. FIG. 13 is a diagram showing an example of an in vivo light irradiation assembly using the light irradiation device of the ninth embodiment. 13A to 13C are diagrams illustrating an example of the arrangement of optical elements in a light irradiation device according to a ninth embodiment. FIG. 23 is a schematic diagram of a light irradiation device according to a tenth embodiment. FIG. 23 is a schematic diagram showing an example of a light-emitting element used in the tenth embodiment. FIG. 23 is a perspective view of a light-emitting element mounting surface side of a support body used in a tenth embodiment. FIG. 23 is a perspective view of the rear surface side of a support body used in the tenth embodiment. 5A and 5B are diagrams illustrating electrical characteristics and optical output characteristics of the light irradiation device according to the embodiment. FIG. 4 is a diagram showing thermal resistance of the light irradiation device according to the embodiment. FIG. 23 is a schematic cross-sectional view showing a first example of the configuration of a light irradiation device according to an eleventh embodiment. FIG. 23 is a schematic cross-sectional view showing a second example of the configuration of the light irradiation device according to the eleventh embodiment. FIG. 23 is a schematic cross-sectional view showing a third example of the configuration of the light irradiation device according to the eleventh embodiment.

Below, with reference to the drawings, an embodiment for carrying out the present disclosure will be described. The following description is intended to concretize the technical ideas of the present disclosure, and unless otherwise specified, the present disclosure is not limited to the following description. In each drawing, the same reference numerals may be used for components having the same function. In consideration of the explanation of the main points or ease of understanding, the embodiments may be shown separately for convenience, but partial substitution or combination of the configurations shown in different embodiments or examples is possible. In the embodiments shown later, differences from the embodiments shown earlier will be mainly explained, and overlapping explanations of matters common to the embodiments shown earlier may be omitted. The sizes and positional relationships of the components shown in each drawing may be exaggerated to clarify the explanation.

First Embodiment
The configuration of the light irradiation device of the first embodiment will be described with reference to Figs. 1, 2A, 2B, 3A, and 3B. The light irradiation device 10C is, for example, inserted into a catheter and introduced into a living body. The light irradiation device 10C is inserted into the vicinity of a target site such as an affected part in a living body using a catheter, so that it is possible to directly irradiate light onto an affected part such as a tumor, or to inspect or confirm a target site for diagnosis, sensing, or the like. Fig. 1 is a schematic perspective view showing an example of the configuration of the light irradiation device 10C of the first embodiment. Fig. 2A is a schematic cross-sectional view showing a first example of the configuration of the light irradiation device 10C. Fig. 2B is a schematic cross-sectional view showing a second example of the configuration of the light irradiation device 10C. Figs. 2A and 2B show a cross section including a central axis C0 along the longitudinal direction P of the elongated light irradiation device 10C having the longitudinal direction P. Fig. 3A is a view of the marker member 20A provided in the light irradiation device 10C shown in Figs. 1 and 2A as viewed from a first direction Q1. FIG. 3B is a diagram of the marker member 20A included in the light irradiation device 10C shown in FIGS. 1 and 2A, viewed from the second direction Q2.

The central axis C0 is an axis parallel to the longitudinal direction P, passing through the center of the cross section of the light irradiation device 10C perpendicular to the axis parallel to the longitudinal direction P. Here, the center refers to the center of the circumscribed circle when the light irradiation device 10C is viewed from the +Z direction. In the example shown in FIG. 2A, the light irradiation device 10C has an outer shape of an approximately rectangular parallelepiped with the longitudinal direction P as the long direction, in which the housing 30A and the marker member 20A are joined. In the example shown in FIG. 2A, the cross section of the light irradiation device 10C perpendicular to the axis parallel to the longitudinal direction P is approximately rectangular. In the example shown in FIG. 2A, the center of the cross section of the light irradiation device 10C perpendicular to the axis parallel to the longitudinal direction P corresponds to the center of the cross section of the rectangular parallelepiped perpendicular to the axis parallel to the longitudinal direction P. However, the cross section of the light irradiation device 10C perpendicular to the axis parallel to the longitudinal direction P is not limited to being approximately rectangular, and may be any shape. The center of the cross section of the light irradiation device 10C perpendicular to an axis parallel to the longitudinal direction P may be approximately the center of any shape perpendicular to an axis parallel to the longitudinal direction P.

As shown in Figs. 1 and 2A, the light irradiation device 10C includes a light emitting section 60 and a marker member 20A that is directly or indirectly connected to the light emitting section 60 and has radiopaque properties. As shown in Figs. 3A and 3B, the marker member 20A viewed from a first direction Q1 perpendicular to the longitudinal direction P differs in at least one of the shape and position from the marker member 20A viewed from a second direction Q2 perpendicular to the longitudinal direction P, which is different from the first direction Q1. The light irradiation device 10C is capable of irradiating light emitted from the light emitting element 11 in a predetermined direction R that intersects with the longitudinal direction P.

For example, in a light irradiation device used for medical purposes, it may be necessary to grasp the direction of light irradiation from the light irradiation device when the light irradiation device is placed in a living body, in order to irradiate light to a targeted part in the living body. The light irradiation device 10C has a marker member 20A that is opaque to radiation such as X-rays and has at least one of a shape and a position different when viewed from a first direction Q1 and a second direction Q2. In addition, the members of the light irradiation device 10C other than the marker member 20A are transparent to radiation. Therefore, when a living body in which the light irradiation device 10C is placed is photographed with an X-ray CT (Computed Tomography) or the like, the image of the marker member 20A can be confirmed in the photographed image. By confirming at least one of the shape and the position of the image of the marker member 20A reflected in the photographed image by the X-ray CT, the orientation of the marker member 20A placed in the living body can be confirmed. The orientation of the marker member 20A is known with respect to the longitudinal direction P, and the light irradiation device 10C can irradiate the light emitted from the light emitting element 11 in a predetermined direction R that intersects with the longitudinal direction P. Therefore, in this embodiment, by using the light irradiation device 10C, the irradiation direction of light from the light irradiation device 10C can be grasped from the orientation of the marker member 20A confirmed based on the X-ray CT image. From another perspective, the light irradiation device 10C has the marker member 20A, and can indicate the irradiation direction of light from the light irradiation device 10C via X-ray CT or the like. In this embodiment, a light irradiation device 10C capable of indicating the irradiation direction of light can be provided.

Here, "at least one of the shape and position is different" means that it is different when viewed with the naked eye, and does not have to be different in the radiographic image. In the radiographic image, the marker member 20A shown in Figures 1 and 2A has the same shape and position when viewed from above (e.g., the +Y side) and when viewed from below (e.g., the -Y side). Therefore, the direction of light irradiation by the light irradiation device 10C cannot be determined from this image alone. However, because the shape of the marker member 20A differs in at least one of the shape and position when viewed with the naked eye, a slight change in the viewing direction will also cause a change in the radiographic image, making it possible to determine whether it is above or below.

The marker member 20A shown in Figures 3A and 3B has a long base 21 and a protrusion 22 provided on the surface of the base 21. This makes it possible to provide a marker member 20A that has a different shape in the first direction Q1 and the second direction Q2. The marker member 20A can be made of a metal material such as platinum that is opaque to radiation.

The marker member 20A is not limited to the convex portion 22, and at least one of a convex portion and a concave portion may be provided on the surface of the base portion 21. Furthermore, the marker member 20A is not limited to having the base portion 21 and at least one of a convex portion and a concave portion, and various shapes can be used as long as at least one of the shape and position differs between the first direction Q1 and the second direction Q2. One or more parts of the marker member 20A may be arranged separately from the other parts.

1 and 2A, the light emitting unit 60 has a light emitting element 11 and a support 12 that supports the light emitting element 11. The support 12 is disposed on the upper surface (e.g., the surface on the +Y side) of the base 21 of the marker member 20A. The light emitting element 11 is disposed on the upper surface of the support 12. The light emitting element 11 can emit light in a direction along the longitudinal direction P from a light emitting surface 111 that intersects with the longitudinal direction P. In the example shown in FIG. 1, the light emitting element 11 emits light in the +Z direction. In the light irradiation device 10C, the light emitting unit 60 has the light emitting element 11 and the support 12, and therefore the support 12 can be used as a heat dissipation member that dissipates heat from the light emitting element 11.

1 and 2A, the light irradiation device 10C has an optical component 40 that directs the light emitted from the light emitting element 11 in the longitudinal direction P in a direction R intersecting the longitudinal direction P. In the example shown in FIG. 1 and 2A, the optical component 40 is a prism that is disposed on the upper surface of the support 12 and includes a reflecting surface 41 that intersects with the upper surface of the support 12. The optical component 40 directs the light emitted from the light emitting element 11 in the direction R by reflecting it on the reflecting surface 41. Note that the optical component 40 is not limited to a prism, and may be a mirror, a lens, a diffractive optical element, or the like, as long as it is capable of directing light in a predetermined direction. The optical component 40 may be configured to include a resin material, a glass material, a metal material, or the like. As shown in FIG. 2B, the optical component 40 may be formed integrally with the support 12.

In the example shown in FIG. 2A, the entire surface of the light-emitting element 11 is covered with an insulating layer 16. This can prevent the light-emitting element 11 from being damaged by a short circuit between the marker member 20A and the light-emitting element 11 via the support 12. Note that in the light irradiation device 10C, at least one of the light-emitting element 11 and the support 12 may be covered with an insulating layer, not limited to the entire surface of the light-emitting element 11. By covering at least one of the light-emitting element 11 and the support 12 with an insulating layer, it is possible to prevent damage to the light-emitting element 11 due to a short circuit between the marker member 20A and the light-emitting element 11.

In the example shown in Figures 1 and 2A, the light irradiation device 10C has an insulated wire 14 electrically connected to the light emitting element 11, and the insulated wire 14 and the marker member 20A are electrically insulated from each other. As described above, the insulated wire 14 includes a first insulated wire 14a and a second insulated wire 14b. By having the insulated wire 14 electrically connected to the light emitting element 11, the light irradiation device 10C can prevent damage to the light emitting element 11 due to a short circuit through the marker member 20A.

1 and 2A, the light irradiation device 10C has a housing 30A including an opening 31A, in which at least a part of the light emitting element 11 and at least a part of the support 12 can be arranged, and a light-transmitting member 32 that seals the opening 31A of the housing 30A. The light-transmitting member 32 transmits light emitted from the light emitting portion 60 and irradiated in a predetermined direction R that intersects with the longitudinal direction P. With this configuration, the light irradiation device 10C can irradiate light from the light emitting element 11 arranged inside the housing 30A through the light-transmitting member 32. In addition, by sealing the opening 31A with the light-transmitting member 32, it is possible to reduce exposure of the inside of the housing 30A to the outside. The housing 30A can be configured to include a resin material or a metal material that has light-shielding or absorbing properties for the peak wavelength of the light emitted from the light emitting element 11. The light-transmitting member 32 can be made of a resin material, glass material, or the like that is translucent to the peak wavelength of the light emitted from the light-emitting element 11.

In the example shown in Fig. 1 and Fig. 2A, the light emitting element 11 is disposed inside the housing 30A, and the inside of the housing 30A is hermetically sealed. This makes it possible to prevent liquid from entering the inside of the housing 30A even when the light irradiation device 10C is disposed inside a biological lumen where liquid such as blood is present, and prevents the light emitting element from being damaged by a short circuit caused by the liquid.

The materials of the support 12, light emitting element 11, optical component 40, insulated wire 14, etc. can be the same as those of the eighth to tenth embodiments described below, and the same applies to the second to seventh embodiments. When the support 12 and optical component 40 are integrally formed as in the example shown in FIG. 2B, they may be integrally formed from the same material. They may contain aluminum nitride (AlN) as a main component because of its high thermal conductivity. Examples of methods for integrally forming the support 12 and optical component 40 include injection molding or pressing a ceramic green sheet.

Second Embodiment
The configuration of the light irradiating device of the second embodiment will be described with reference to Fig. 4A, Fig. 4B, and Fig. 5. Fig. 4A is a schematic cross-sectional view showing an example of the configuration of the light irradiating device 10D of the second embodiment. Fig. 4B is a schematic bottom view showing an example of the configuration of the light irradiating device 10D. Fig. 5 is a schematic cross-sectional view showing a state in which the light irradiating device 10D is rotated 180 degrees from the state shown in Fig. 4A around the central axis C0 of the light irradiating device 10D parallel to the longitudinal direction P as the rotation axis. Figs. 4A and 5 show a cross section including the central axis C0 along the longitudinal direction P of the elongated light irradiating device 10D having the longitudinal direction P.

As shown in Figs. 4A, 4B and 5, the light irradiation device 10D includes a light emitting element 11, a support 12 to which the light emitting element 11 is fixed, and a radiopaque marker section 20D. The marker section 20D viewed from a first direction Q1 perpendicular to the longitudinal direction P differs in at least one of shape and position from the marker section 20D viewed from a second direction Q2 perpendicular to the longitudinal direction P, which is different from the first direction Q1. The marker section 20D is provided on the support 12. The light irradiation device 10D can irradiate light emitted from the light emitting element 11 in a predetermined direction R intersecting the longitudinal direction. In this embodiment, the light emitting element 11 is an example of a light emitting section 60. In Fig. 4A, the light emitting element 11 and the light emitting section 60 are labeled with the same reference numerals in order to indicate that the light emitting element 11 and the light emitting section 60 are the same. In the following figures, the reference numerals may be labeled with the same reference numerals in the same manner.

In this embodiment, by having the marker part 20D, the light irradiation direction from the light irradiation device 10D can be indicated via X-ray CT or the like, as in the first embodiment described above, and a light irradiation device 10C capable of indicating the light irradiation direction can be provided. In addition, in this embodiment, since the marker part 20D is provided on the support 12, the configuration of the light irradiation device can be simplified compared to the case where a member functioning as a marker part is provided outside the support 12. Note that the marker part 20D is fixed to the support 12 and can move integrally with the support 12. In this embodiment, "at least one of the shape and the position is different" only needs to be different to the naked eye, and does not need to be different in the radiographic image. In the radiographic image, the marker part 20D shown in FIG. 4A, FIG. 4B, and FIG. 5 has the same shape and position when viewed from above (e.g., the +Y side) and when viewed from below (e.g., the -Y side). Therefore, the light irradiation direction by the light irradiation device 10D cannot be grasped from this image alone. However, the shape of the marker part 20D differs visually in at least one of the shape and position, so if you change the viewing direction slightly, the radiographic image also changes, making it possible to tell whether it is above or below.

In the example shown in FIG. 4A, FIG. 4B, and FIG. 5, the support 12 includes a first surface 12a on which the light emitting element 11 is arranged, and a second surface 12b located on the opposite side to the first surface 12a. The marker portion 20D is provided on the second surface 12b of the support 12. With this configuration, in the light irradiation device 10D, the marker portion 20D is provided on the second surface 12b of the support 12, which is opposite to the first surface 12a on which the light emitting element 11 is arranged, so that the area on the support 12 can be effectively utilized. The marker portion 20D on the first surface 12a has anisotropy when viewed from a direction parallel or perpendicular to the first surface 12a, and the marker portion 20D on the second surface 12b may have anisotropy in a direction different from the first surface 12a. The anisotropy of the marker portion 20D refers to a property in which at least one of the shape and the position of the marker portion 20D is different.

Furthermore, in the light irradiation device 10D, the marker portion 20D is made of a metal material, and at least a portion of the marker portion 20D has a thickness of 20 μm or more and 100 μm or less. In the example shown in FIG. 4A, FIG. 4B, and FIG. 5, the marker portion 20D is a plate-shaped member with a thickness t1. The thickness t1 is 20 μm or more and 100 μm or less. Making the thickness of at least a portion of the marker portion 20D 40 μm or more is preferable because it improves visibility in radiographic images. Furthermore, making the thickness 100 μm or less allows for a compact size.

The metal material constituting the marker portion 20D may be platinum or the like. The marker portion 20D is provided by, for example, plating platinum on the second surface 12b of the support body 12. However, the marker portion 20D is not limited to being provided on a part of another member such as the support body 12. The marker portion 20D may be an independent member that is joined to another member such as the support body 12 by an adhesive or the like.

In the light irradiation device 10D, the position of the marker part 20D when viewed from the third direction Q3, which is a direction parallel to the first surface 12a, differs from the position of the marker part 20D when viewed from the third direction Q3 by rotating the light irradiation device 10D 180 degrees around the central axis C0 of the light irradiation device 10D parallel to the longitudinal direction P as the axis of rotation by more than twice the distance t2 between the first surface 12a and the second surface 12b in the support 12. The first position 20v shown in FIG. 4A represents the position of the marker part 20D when viewed from the third direction Q3, which is a direction parallel to the first surface 12a. On the other hand, the second position 20u shown in FIG. 5 represents the position of the marker part 20D when viewed from the third direction Q3 by rotating the light irradiation device 10D 180 degrees around the central axis C0 of the light irradiation device 10D parallel to the longitudinal direction P as the axis of rotation. The second position 20u shown in FIG. 4A is a virtual representation of the second position 20u in the state shown in FIG. 5, in order to compare it with the first position 20v. The distance d between the first position 20v and the second position 20u is at least twice the distance t2. This configuration makes it easier to see the difference in the position of the marker unit 20D depending on the viewing direction. By making it easier to see the difference in the position of the marker unit 20D depending on the viewing direction, in this embodiment, the marker unit 20D can be used to clearly indicate the direction of light emitted from the light irradiation device 10D via X-ray CT or the like.

In the light irradiation device 10D, the light emitting portion is a light emitting element 11. The light emitting element 11 is disposed on a support 12. With this configuration, the light irradiation device 10D can be provided with a light source, and therefore the position control of the light irradiation device 10D can be easily performed.

In the examples shown in Figures 4A, 4B, and 5, the optical component 40 of the light irradiation device 10D is placed on the support 12.

Third Embodiment
The configuration of the light irradiating device of the third embodiment will be described with reference to Fig. 6. Fig. 6 is a schematic cross-sectional view showing an example of the configuration of the light irradiating device 10E of the third embodiment. Fig. 6 shows a cross section including a central axis C0 along the longitudinal direction P of the elongated light irradiating device 10E having the longitudinal direction P.

In the light irradiation device 10E, the marker section 20D is provided on both the first surface 12a and the second surface 12b. The marker section 20D provided on the first surface 12a differs from the marker section 20D provided on the second surface 12b in at least one of the size and the position of the marker section 20D. This configuration makes it easy to see the difference in the position of the marker section 20D depending on the viewing direction, so that the direction of the light irradiated from the light irradiation device 10E can be clearly indicated via X-ray CT or the like.

In the example shown in FIG. 6, the marker portion 20D includes a first marker portion 20Da and a second marker portion 20Db. The first marker portion 20Da is provided on the first surface 12a alongside the light-emitting element 11 in the direction along the longitudinal direction P. The second marker portion 20Db is provided on the second surface 12b. The first marker portion 20Da is provided at a position shifted in the longitudinal direction P from the second marker portion 20Db. The first marker portion 20Da is smaller than the second marker portion 20Db. In other words, the first marker portion 20Da differs from the second marker portion 20Db in both size and position. In this embodiment, "at least one of the shape and position is different" means that the marker portions are different to the naked eye, and do not need to be different in a radiological image. In the radiographic image, the marker unit 20D shown in FIG. 6 has the same shape and position when viewed from above (e.g., the +Y side) and from below (e.g., the -Y side). Therefore, the direction of light irradiation by the light irradiation device 10E cannot be determined from this image alone. However, since the shape of the marker unit 20D differs visually in at least one of the shape and position, a slight change in the viewing direction also causes a change in the radiographic image, making it possible to determine whether it is above or below. Note that there are two directions that are different to the naked eye but are not different in the radiographic image, as in the fourth to seventh embodiments described below, and therefore a description of this will be omitted in the fourth to seventh embodiments.

Fourth Embodiment
The configuration of the light irradiating device of the fourth embodiment will be described with reference to Fig. 7. Fig. 7 is a schematic cross-sectional view showing an example of the configuration of the light irradiating device 10F of the fourth embodiment. Fig. 7 shows a cross section including a central axis C0 along the longitudinal direction P of the elongated light irradiating device 10F having the longitudinal direction P.

In the light irradiation device 10F, the light output section is a fiber 18. The fiber 18 is disposed on the support 12. With this configuration, the light irradiation device 10F can guide light from a light source disposed remotely, so there is no need to provide a light source inside the light irradiation device. By not providing a light source in the light irradiation device 10F, the configuration of the light output section 60 of the light irradiation device 10F can be simplified.

Fifth Embodiment
The configuration of the light irradiating device of the fifth embodiment will be described with reference to Fig. 8A and Fig. 8B. Fig. 8A is a schematic cross-sectional view showing an example of the configuration of the light irradiating device 10G of the fifth embodiment. Fig. 8A shows a cross-section including a central axis C0 along the longitudinal direction P of the elongated light irradiating device 10G having the longitudinal direction P. Fig. 8B is a schematic bottom view showing an example of the configuration of the light irradiating device 10G.

As shown in FIG. 8B, in the light irradiation device 10G, the second surface 12b of the support 12 includes a first region 12b1 and a second region 12b2 different from the first region 12b1. A marker portion 20D is provided in the first region 12b1, and an insulated wire 14 is arranged in the second region 12b2. In the example shown in FIG. 8A and FIG. 8B, a second insulated wire 14b is arranged in the second region 12b2.

In the light irradiation device 10G, by providing a marker portion 20D on the second surface 12b of the support 12 and arranging an insulated electric wire 14, the thickness of the light irradiation device 10G can be made thinner than when the insulated electric wire 14 is arranged on the marker portion 20D provided on the second surface 12b.

Sixth Embodiment
The configuration of the light irradiating device of the sixth embodiment will be described with reference to Fig. 9. Fig. 9 is a schematic cross-sectional view showing an example of the configuration of the light irradiating device 10H of the sixth embodiment. Fig. 9 shows a cross section including a central axis C0 along the longitudinal direction P of the elongated light irradiating device 10H having the longitudinal direction P.

The light irradiation device 10H mainly differs from the above-described embodiment in that it has an optical component 40 that imparts at least one of the optical effects of reflection, refraction, and diffraction to the light emitted from the light emitting section 60, and the marker section 20D is provided on the optical component 40.

In the light irradiation device 10H, the light emitting section 60 emits light in a direction along the longitudinal direction P, and the optical component 40 includes a reflecting surface 41 that reflects the light from the light emitting section 60 in a direction intersecting the longitudinal direction P. The marker section 20D is provided in an area of the optical component 40 other than the area where the reflecting surface 41 is provided. In the example shown in FIG. 9, the optical component 40 is disposed on the upper surface of the support 12. The optical component 40 is a prism having a reflecting surface 41 and a surface 42 located on the opposite side of the reflecting surface 41. The marker section 20D is provided on the surface 42 of the optical component 40. In the light irradiation device 10H, the configuration of the light irradiation device can be simplified by providing the marker section 20D on the optical component 40. However, the marker section 20D may be provided on at least one of the side surfaces intersecting the surface 42 of the optical component 40, for example, the surface on the +X side and the surface on the -X side of the optical component 40.

Seventh Embodiment
The configuration of a light irradiating device according to the seventh embodiment will be described with reference to Fig. 10. Fig. 10 is a schematic perspective view showing an example of the configuration of a light irradiating device 10J according to the seventh embodiment.

The light irradiation device 10J includes a marker portion 20D and a second marker portion 20J in a portion other than the support 12 and the optical component 40. In the example shown in FIG. 10, the light irradiation device 10J includes a marker portion 20D provided on the support 12 and a second marker portion 20J arranged on the opposite side of the optical component 40 across the light emission portion 60. The second marker portion 20J is a cylindrical member inside which the insulated electric wire 14 can be arranged. However, the shape of the second marker portion 20J is not limited to a cylindrical shape and may be any shape.

By providing the second marker unit 20J, the light irradiation device 10J can make the marker unit that appears in the X-ray CT image larger than when only the marker unit 20D is provided. This improves the visibility of the marker unit, and it is possible to provide a light irradiation device 10J that allows the position of the light irradiation device 10J to be easily confirmed. On the other hand, when the second marker unit 20J is not provided and only the marker unit 20D is provided, the exact position and orientation can be confirmed with the marker unit 20D. This makes it possible to provide a light irradiation device 10J that can indicate the light irradiation direction with high accuracy.

The eighth to tenth embodiments will be described below. In the eighth to tenth embodiments, examples are described in which a marker member or marker portion is not provided, but the light irradiation device described in the eighth to tenth embodiments may be provided with the marker member or marker portion described in the first to seventh embodiments.

Eighth embodiment
FIG. 11 is a diagram showing an example of an in vivo light irradiation assembly 100 using the light irradiation device 10 of the eighth embodiment. The in vivo light irradiation assembly 100 includes a catheter 50 and a light irradiation device 10 inserted into the catheter 50, and the catheter 50 is filled with a refrigerant 51 at least during use. The in vivo light irradiation assembly 100 is used for treatment, diagnosis, sensing, and the like. The light irradiation device 10 is, for example, inserted into the catheter 50 in the direction indicated by the "insertion direction" of the white arrow in the figure, and introduced into a living body. Since the light irradiation device 10 is a heat generating body, the refrigerant 51 is supplied into the catheter 50, and the heat generating part is cooled when used. Therefore, the tip side of the light irradiation device 10 is integrally covered by an insulating layer 16. The refrigerant 51 is, for example, physiological saline, blood, lymph, etc., and the refrigerant temperature is, for example, about 10°C to 36°C. The light irradiation device 10 is inserted into the vicinity of the irradiation target site, such as an affected area, inside a living body using a catheter 50, so that it is possible to directly irradiate the affected area, such as a tumor, with light, and to inspect and confirm the target site for diagnosis, sensing, etc., without using an optical fiber.

12A and 12B are schematic diagrams showing an example of the configuration of the light irradiation device 10 of the eighth embodiment shown in FIG. 1. In both the light irradiation device 10A of FIG. 12A and the light irradiation device 10B of FIG. 12B, the light emitting element, the support on which the light emitting element is mounted, and the insulated electric wire electrically connected to the light emitting element are integrally covered with an insulating layer, but the covering state of the insulating layer is different. In the coordinate system of FIG. 12A and FIG. 12B, the optical axis direction is the Z direction, the mounting direction of the light emitting element on the support is the Y direction, and the direction perpendicular to the Z direction and the Y direction is the X direction. The light irradiation device 10A of FIG. 12A includes a light emitting element 11 that emits light of a predetermined wavelength, an optical component 17 into which the light emitted from the light emitting element 11 is incident, a support 12 that mounts the light emitting element 11 and the optical component 17, an insulated electric wire 14 electrically connected to the light emitting element 11, and an insulating layer 16A that integrally covers the outer surface of the structure including the light emitting element 11, the optical component 17, the support 12, and the insulated electric wire 14. The insulating layer 16A is a coating (hereinafter referred to as a polysilazane coating) formed by applying a polysilazane solution and silicifying it, and is transparent to the light emitted from the light emitting element 11. By adopting a polysilazane coating, the thickness of the insulating layer can be reduced to improve heat dissipation while ensuring insulation. The light emission surface 111 of the light emitting element 11 and the light incidence surface 171 of the optical component 17 face each other with the space 13 in between. The light emitted from the light emission surface 111 passes through the insulating layer 16A, the space 13, and the insulating layer 16A and enters the light incidence surface 171 of the optical component 17. The insulating layer 16A in FIG. 12A seals the stacked structure along the surface shape of the support 12 and the components such as the light emitting element 11 mounted on the support 12.

In this configuration example, the longitudinal direction of the support 12 is parallel to the Z direction. The light irradiation device 10 of the eighth embodiment is inserted into the catheter 50 in the +Z direction, and the insulated wires 14 including the first insulated wire 14a and the second insulated wire 14b extend in the -Z direction. The support 12 is formed of an insulating material such as silicon (Si), aluminum nitride (AlN), silicon nitride (SiN), alumina (Al ₂ O ₃ ), glass, quartz, ceramics, etc., and a material with a thermal conductivity of 100 W/m·K or more is preferable. In addition to the insulating material, a metal material such as copper or a resin material may be used. When a metal material is used, an insulation process is performed as appropriate to prevent short circuits and the like. The light emitting element 11 is mounted on the light emitting element mounting surface 121 of the support 12.

The optical component 17 is mounted on the light-emitting element mounting surface 121 of the support 12 together with the light-emitting element 11, and the light incident surface 171 of the optical component 17 is inclined with respect to the light-emitting element mounting surface 121. As a result, the light incident surface 171 of the optical component 17 functions as a reflecting surface, and the output light Lout of the light irradiation device 10A is extracted in the direction of the dashed arrow. In the configuration example of FIG. 12A, the optical component 17 is a reflecting member that guides the light emitted from the light-emitting element 11 in a direction intersecting with the light-emitting element mounting surface 121 of the support 12 (for example, the +Y direction). This allows the light to be emitted in the circumferential direction of the light irradiation device. The optical component 17 may be a mirror that reflects the light incident on the light incident surface 171. The mirror may have a reflective layer of metal and/or a dielectric multilayer film. This allows the light to be reflected efficiently.

The insulated wire 14 includes a first insulated wire 14a electrically connected to one electrode (also called the first electrode) of the light-emitting element 11 on the side of the light-emitting element mounting surface 121, which is the first surface of the support 12 on which the light-emitting element 11 is mounted, and a second insulated wire 14b electrically connected to the other electrode (also called the second electrode) of the light-emitting element 11 on the side of the back surface 122 (also called the second surface) opposite the light-emitting element mounting surface 121. By using the insulated wire, it is possible to pass electricity through the light-emitting element 11. One of the features of the light irradiation device 10A is that the electrical connection parts between the first insulated wire 14a and the second insulated wire 14b and the light-emitting element 11 are sealed together with the support 12, the light-emitting element 11, and the optical component 17 by an insulating layer 16A. The thickness of the insulating layer 16A is thinner than the thickness of the light-emitting element 11. By integrally covering the light irradiation device 10A with an insulating layer 16 that is thinner than the thickness of the light emitting element 11, a small light irradiation device 10A with ensured electrical insulation is realized, making it easier to insert into the catheter 50. In addition, by making the thickness of the insulating layer 16A thinner than the thickness of the light emitting element, the thermal resistance of the insulating layer 16 can be reduced, and heat dissipation can be improved.

The width of the support 12 in the X direction is such that it can be easily inserted into the catheter 50, but from the viewpoint of widening the cooling area (i.e., heat dissipation area) by the refrigerant 51, it may be set as wide as possible within the range that allows smooth insertion into the catheter 50. The thickness of the support 12 in the Y direction is such that it can stably support the light-emitting element 11 and can be smoothly inserted into the catheter 50 with the light-emitting element 11 mounted. As an example, the thickness of the support 12 is about 0.075 mm to 0.3 mm.

The insulating layer 16A, which seals the support 12 and the components on the support 12 together, is a polysilazane coat or an insulating resin such as an epoxy resin, a silicone resin, an acrylic resin, or a thermoplastic resin. By sealing the components together with the insulating layer, that is, in one process, the process can be simplified. When using these resins, it is preferable to use an insulating resin that is biocompatible and has high thermal conductivity and high transmittance for the emission wavelength for the insulating layer 16A. As such insulating resins, polycarbonate (PC), polyethylene terephthalate (PET), polyimide (PI), polyurethane, polyesterimide, etc., whose components and compositions are adjusted to reduce adverse effects on living bodies, can be used. The insulating layer 16A may be a biocompatible resin layer provided on the surface of a polysilazane coat. The insulating layer 16A isolates the electrical connection between the light emitting element 11 and the first insulated wire 14a and the second insulated wire 14b from the refrigerant 51. While maintaining this sealed state, the first insulated wire 14a and the second insulated wire 14b are pulled out from the insulating layer 16A in the -Z direction.

The first insulated wire 14a and the second insulated wire 14b are cooled by the refrigerant 51 and also function as a heat sink. The insulated wire 14 is, for example, an enameled wire, and the metal wiring of a good conductor such as Cu or Ni is insulated and coated with polyurethane, which is an insulating coating. Instead of polyurethane, coating with insulating resin such as polyester, polyesterimide, polyamideimide, or polyimide may be used. By using the insulating coating, which is the surface coating of the insulated wire 14, as a heat sink, the heat generated from the light emitting element 11 can be released to the outside. When a rectangular enameled wire is used as the first insulated wire 14a and the second insulated wire 14b, the wiring becomes wide, and the joint area with the support 12 can be increased. In addition, when the area of the circumscribed circle is the same, the area of the circumscribed circle of the rectangular enameled wire can be made smaller than that of the round enameled wire, so that the size can be reduced.

The light-emitting element 11 is, for example, an edge-emitting laser element, which resonates in a direction parallel to the Z-axis. When an edge-emitting laser element is used as the light-emitting element 11, one end face in the resonance direction becomes the light emission surface 111. An optical component 17 is arranged on the light-emitting element mounting surface 121 of the support 12 so as to face the light emission surface 111 of the light-emitting element 11, and guides the light emitted from the edge-emitting laser element in a direction intersecting with the light-emitting element mounting surface 121. The direction intersecting with the light-emitting element mounting surface 121 is all directions except for directions parallel to the light-emitting element mounting surface 121, but can be, for example, in the range of 50° to 130° with respect to the light-emitting element mounting surface 121. It may also be a direction perpendicular to the light-emitting element mounting surface 121. Here, the "perpendicular" direction does not need to be strictly perpendicular to the light-emitting element mounting surface 121, and includes a range of 90°±5° taking into account the manufacturing errors and surface conditions of the support 12 and the optical component 17. The light emitted from the light emitting element 11 is reflected by the light incident surface 171 of the optical component 17 and is irradiated in a predetermined direction. If a polysilazane coating is used for the insulating layer 16A, the light can also be reflected by the polysilazane coating. The optical component 17 may be composed of a combination of a first optical element that controls the spread angle of the light emitted from the light emitting element 11 and a second optical element that has a reflecting function, as long as a predetermined space 13 is maintained between the optical component 17 and the light emitting surface 111 of the light emitting element 11.

In the configuration example of FIG. 12A, the first insulated wire 14a and the second insulated wire 14b are connected to the upper surface of the light emitting element 11 and the back surface 122 of the support 12, respectively, so as not to interfere with the light emission in the Z direction of the light emitting element 11 and the reflection by the optical component 17. A conductive layer 124 is formed on at least a part of the surface of the support 12. In the example of FIG. 12A, the support 12 has a conductive layer 124 formed on at least a part of the light emitting element mounting surface 121, the back surface 122, and the side surface connecting the light emitting element mounting surface 121 and the back surface 122. As a result, the first insulated wire 14a is directly or indirectly electrically connected to one electrode of the light emitting element 11 on the side of the light emitting element mounting surface 121 of the support 12. The second insulated wire 14b is directly or indirectly electrically connected to the other electrode of the light emitting element 11 on the back surface 122 of the support 12 via the conductive layer 124 formed on the support 12.

The configuration of the light emitting element 11 mounted on the support 12 of the light irradiation device 10B in FIG. 12B and the insulated electric wire 14 electrically connected to the light emitting element 11 is the same as that of the light irradiation device 10A, but the covering state with the insulating layer 16B is different from that of FIG. 12A. The thickness of the insulating layer 16B may be thicker than the thickness of the light emitting element 11 in at least a part. In this case, the space between the light emitting surface 111 of the light emitting element 11 and the light incident surface 171 of the optical component 17 may be filled with the insulating layer 16B. The light emitted from the light emitting surface 111 of the light emitting element 11 passes through the insulating layer 16B and enters the light incident surface 171 of the optical component 17. The material of the insulating layer 16B can be the same as that of the insulating layer 16A described above. By making the insulating layer 16B thick, the support 12, the light emitting element 11, the optical component 17, and the insulated electric wire 14 can be stably held as a whole, and the optical coupling portion and the electrical connection portion can be reliably prevented from contacting the refrigerant. The thickness of the insulating layer 16B may be greater than the thickness of the light-emitting element 11 over the entire area.

FIG. 13 is a perspective view of the light irradiation device body before being sealed with the insulating layer 16 (or 16A or 16B). A predetermined space 13 is provided between the light emission surface 111 of the light emitting element 11 and the light incidence surface 171 of the optical component 17. The light emitted from the light emitting element 11 passes through the space 13 and enters the optical component 17, where it is reflected in a predetermined direction. A conductive layer 124 is formed covering at least a part of the light emitting element mounting surface 121 of the support 12, at least a part of the side surface, and at least a part of the back surface 122. The top surface of the light emitting element 11 is connected to the first insulated wire 14a, and the bottom surface of the light emitting element 11 is connected to the conductive layer 124 formed on the light emitting element mounting surface 121.

A part of the insulating coating of the first insulated wire 14a is removed, and the internal metal wiring is connected to one electrode of the light-emitting element 11. A part of the insulating coating of the second insulated wire 14b is removed, and the internal metal wiring is electrically connected to the other electrode of the light-emitting element 11. In the example of FIG. 13, a conductive layer 124 is formed from the light-emitting element mounting surface 121 of the support 12 through the side surface to the back surface 122, and the internal metal wiring of the second insulated wire 14b is connected to the conductive layer 124 on the back surface 122 of the support 12. This provides an electrical connection between the other electrode of the light-emitting element 11 and the second insulated wire 14b. By providing a conductive layer 124 for electrical connection on the surface of the support 12, the conductive layer 124 can be used as a heat dissipation member.

As described above, the optical component 17 is mounted on the support 12 and faces the light emission surface 111 of the light emitting element 11. The main body of the optical component 17 is formed of a dielectric material such as glass, and a thin silver film is formed on the light incidence surface 171, but this example is not limited to this. A thin film of aluminum, aluminum alloy, gold, nickel, platinum, etc. may be formed on the light incidence surface (i.e., the reflection surface) of the main body of an insulating material such as plastic, resin, silicon (Si), aluminum nitride (AlN), silicon nitride (SiN), alumina ( _{Al 2} O ₃ ), glass, quartz, ceramics, etc. Instead of a metal reflection film, a dielectric multilayer film may be formed. The support 12, the light emitting element 11, the optical component 17, and a part of the insulated electric wire 14 are covered with a light-transmitting insulating layer 16A or 16B by a dipping method, a spraying method, etc.

14 is a schematic diagram of the light-emitting element 11 mounted on the support 12. The light-emitting element 11 is, for example, an edge-emitting laser element having a ridge structure. The light-emitting element 11 has an n-side electrode 113, an n-side semiconductor layer 114, an active layer 115, a p-side semiconductor layer 116, and a p-side electrode 118. The n-side semiconductor layer 114 may include an optical guide layer, a cladding layer, a contact layer, etc., to which an n-type impurity is added. The p-side semiconductor layer 116 may include an optical guide layer, a cladding layer, a contact layer, etc., to which a p-type impurity is added. The p-side electrode 118 is electrically connected to the first insulated wire 14a. When an ITO electrode is used as the p-side electrode 118, the p-side electrode 118 may also serve as the cladding layer. The p-side electrode 118 is electrically connected to the second insulated wire 14b via a conductive layer 124 formed on the support 12. In the example of Figure 14, the n-side electrode 113 and the first insulated wire 14a are directly connected, but they may be indirectly connected, for example, a second support may be disposed between the n-side electrode 113 and the first insulated wire 14a. As will be described later with reference to Figure 15, by sandwiching the light-emitting element 11 between the two supports 12-1 and 12-2, heat dissipation can be improved.

The semiconductor material and its composition of the light-emitting element 11 are designed to emit laser light of a desired wavelength. When the light-emitting element 11 is used as an ultraviolet laser, a purple laser, a blue laser, or a green laser, GaN-based materials such as GaN, InGaN, and AlGaN are used. When the light-emitting element 11 is used as a red laser, an infrared laser, or a near-infrared laser, GaAs-based materials such as GaAs and AlGaAs, or InP-based materials such as InAlGaP and GaInP are used. In order to seal the light-emitting element 11 together with the first insulated wire 14a and the second insulated wire 14b with the insulating layer 16A or 16B while the light-emitting element 11 is mounted on the support 12, the width of the ridge may be formed wide to ensure the gain of the active layer 115. The width of the ridge may be designed to be, for example, 2 μm to 100 μm. The transverse mode may be a multimode or a single mode.

Unlike irradiation devices that irradiate laser light via optical fibers, the light emitted by the light emitting element 11 of this embodiment is linearly polarized, and the direction of the linear polarization after emission can be changed by changing the reflection direction using an optical component 17 such as a mirror. This makes it possible to reduce the reflectance when the light enters a living body, and to improve the transmittance through the living body. Even light that is in a specific polarization state when the laser light is emitted may have its polarization state fluctuate or become depolarized while passing through a transmission medium such as an optical fiber. In this embodiment, light can be directly irradiated to an affected area inside the body without using an optical fiber, so light can be irradiated to a target location such as an affected area while maintaining a specific polarization state.

Figure 15 is a schematic diagram showing an example of stacking of the support 12 and the light-emitting element 11. In this configuration example, the light-emitting element 11 is sandwiched between the first support 12-1 and the second support 12-2. The first support 12-1 is in contact with the top surface of the light-emitting element 11, and the second support 12-2 is in contact with the bottom surface of the light-emitting element 11. By sandwiching the light-emitting element 11 between the first support 12-1 and the second support 12-2, heat can be efficiently dissipated to the upper and lower sides of the light-emitting element 11, improving the heat dissipation properties of the light irradiation device 10. The rear end of at least one of the support 12-1 and the second support 12-2 may be extended in the -Z direction. In FIG. 15, it is assumed that the optical component 17 extracts light in a direction (for example, the Y direction) that is not parallel to the optical axis (Z axis), but as described in the second embodiment, if the light is extracted in a direction parallel to the light-emitting element mounting surface 121 of the support 12, the tip sides of the first support 12-1 and the second support 12-2 may be extended long in the +Z direction. The entire structure in FIG. 15 is covered with an insulating layer 16A or 16B.

Ninth embodiment
16 is a diagram showing an example of an in vivo light irradiation assembly 200 using the light irradiation device 20 of the ninth embodiment. The in vivo light irradiation assembly 200 includes a catheter 50 and the light irradiation device 20 inserted into the catheter 50, and the catheter 50 is filled with a refrigerant 51 at least during use. The in vivo light irradiation assembly 200 is used for treatment, diagnosis, sensing, and the like. As with the light irradiation device 10 of the eighth embodiment, the light irradiation device 20 is inserted into the catheter 50 in the "insertion direction" of the white arrow in the figure, and introduced into the living body.

The light irradiation device 20 is used with its heat generating portion cooled. In the ninth embodiment, the insulated wires 24 are pulled out from both sides along the optical axis of the insulating layer 26 to enhance heat dissipation. The insulated wires 24 include a first insulated wire 24a and a second insulated wire 14b that are electrically connected to the light emitting element 11. The length of the insulated wire 24 pulled out from the insulating layer 26 in the +Z direction may be shorter than the length of the insulated wire 24 pulled out from the insulating layer 26 in the -Z direction. To achieve this configuration, the light emitted from the light emitting element 11 is guided in a direction parallel to the light emitting element mounting surface or in a direction that is not obstructed by the first insulated wire 24a and the second insulated wire 24b. The covering form of the insulating layer 26 may be a thin covering along the surface shape of the support 12 and the components mounted on the support 12 as shown in FIG. 12A to enhance heat dissipation, or it may be partially thick by filling in the spaces between the components mounted on the support 12 as shown in FIG. 12B, while keeping the overall thickness of the light irradiation device as small as possible to ensure electrical insulation from the refrigerant 51.

FIG. 17 is a diagram showing an example of the arrangement of the optical components 27 of the light irradiation device 20. In order to clearly show the configuration, FIG. 17 shows the state before the first insulated wire 24a and the second insulated wire 24b are electrically connected to the light emitting element 11. The light emitted from the light emitting surface 111 of the light emitting element 11 is reflected by the optical components 27 in a direction approximately parallel to the light emitting element mounting surface 121, and the output light Lout of the light irradiation device 20 is extracted in the direction of the dashed arrow. As long as the reflected light from the optical components 27 is not blocked by the first insulated wire 24a and the second insulated wire 24b, the light may be reflected in a non-parallel direction from the light emitting element mounting surface 121.

In the actual light irradiation device 20, the light emitting element 11, the optical component 27, and the electrical connection parts between the light emitting element 11 and the first insulated wire 24a and the second insulated wire 24b are sealed with the insulating layer 26 integrally with the support 12. At least the part of the insulating layer 26 that exists between the light emitting element 11's light exit surface 111 and the light incident surface 171 of the optical component is translucent to the light emitted from the light emitting element 11.

The light-emitting element 11 is, for example, an edge-emitting laser element. The light-emitting element 11 may be a laser element having a wide ridge structure similar to that of the eighth embodiment. The direction parallel to the Z axis of the light-emitting element 11 is the resonance direction. An optical component 27 is disposed on the light-emitting element mounting surface 121 of the support 12, and guides the light emitted from the emission surface of the laser element in a direction parallel to the light-emitting element mounting surface 121 of the support 12. The first insulated electric wire 24a and the second insulated electric wire 24b (see FIG. 16) extend in the +Z direction and the -Z direction, sandwiching the light-emitting element 11 and the support 12, so that the light from the light-emitting element 11 is reflected by the optical component 27 in a direction that is not obstructed by the first insulated electric wire 24a and the second insulated electric wire 24b.

The optical component 27 reflects the light emitted from the light emission surface of the light emitting element 11, for example, in the X direction parallel to the light emitting element mounting surface 121. Here, the "parallel" direction does not need to be strictly parallel to the light emitting element mounting surface 121, and may have an error of about ±10°, including the surface state of the support 12 and the manufacturing error of the optical component 27. As long as the laser light reflected by the optical component 27 does not interfere with the first insulated electric wire 24a and the second insulated electric wire 24b, it may be extracted at an angle other than parallel. The optical component 27 is preferably as thick as the light emitting element 11 or thinner than the light emitting element 11. The optical component is a flat-processed mirror or prism, or a meta-polarizing element with a metasurface element inserted. The optical component 27 may also be an optical element having a lens function that controls the spread angle of the light emitted from the light emitting element 11. The optical component 27 may be composed of two or more optical elements. For example, the device may have an optical element that has a lens function to control the spread angle of the light emitted from the light-emitting element 11, and an optical element that reflects the light whose spread angle has been controlled by the optical element at a predetermined angle.

The insulating layer 26 integrally seals the locations where electrical insulation is required with the first insulated wire 24a and the second insulated wire 24b extended in the +Z and -Z directions from both ends of the optical axis direction of the support 12. The electrical connection between the light emitting element 11 and the first insulated wire 24a and the second insulated wire 24b, and at least the light emission surface 111 of the light emitting element 11 and the light incidence surface 171 of the optical component 17 are sealed by the insulating layer 26 and isolated from the refrigerant 51. The insulating layer 26 is preferably a biocompatible resin with high thermal conductivity.

At least one of the two ends in the longitudinal direction (Z direction) of the support 12 may protrude from the insulating layer 26. The support 12 protruding from the insulating layer 26 comes into contact with the refrigerant 51, thereby ensuring the heat dissipation of the light irradiation device 20. In addition, by drawing out the first insulated wire 24a and the second insulated wire 24b on both sides in the longitudinal direction of the support 12, the heat dissipation is further improved compared to the eighth embodiment. As in the eighth embodiment, the overall thickness and width of the light irradiation device 20 are about 0.5 mm, and an ultra-compact light irradiation device 20 that can be mounted on a catheter 50 is realized. In the configuration of the ninth embodiment, the light emitting element 11 may be sandwiched between two supports 12-1 and 12-2 as shown in FIG. 15. In the ninth embodiment, the light emitted from the light emitting element 11 is extracted in a direction that is not obstructed by the support 12, so that the heat dissipation of the light irradiation device 20 can be further improved by sandwiching it between two supports 12-1 and 12-2.

Tenth embodiment
Fig. 18 is a schematic diagram of a light irradiation device 30 according to a tenth embodiment. As in the eighth and ninth embodiments, the light irradiation device 30 is also mounted on a catheter 50 (see Figs. 11 and 16) for use, and the light irradiation device 30 and the catheter 50 can constitute an in-vivo light irradiation assembly. In the tenth embodiment, a vertical cavity surface emitting laser (VCSEL) is used as the light emitting element 31.

The light irradiation device 30 has two light emitting elements 31 that emit light of a predetermined wavelength, a support 12 on which the light emitting elements 31 are mounted, and an insulated wire 34 electrically connected to the light emitting elements 31. The insulated wire 34 includes a first insulated wire 34a connected to one electrode of each light emitting element 31 and a second insulated wire 34b connected to the other electrode. The light emitting surface of the light emitting element 31 and the electrical connection portion between the light emitting element 31 and the insulated wire 34 are integrally sealed with the support 12 by an insulating layer 36. At least one of both ends along the longitudinal direction (Z direction) of the support 12 may protrude from the insulating layer 36. At least the portion of the insulating layer 36 that covers the light emitting surface is translucent. The thickness of the insulating layer 36 may be thicker or thinner than the thickness of the light emitting element 31.

The light emission surface of the VCSEL used for the light-emitting element 31 is parallel to the light-emitting element mounting surface 121 of the support 12, and the laser light emitted from the VCSEL is emitted in a direction perpendicular to the light-emitting element mounting surface 121, as shown by the white arrow in the figure. With this configuration, no optical components such as mirrors are required.

The first insulated wire 34a and the second insulated wire 34b are, for example, two-core enameled wires. The first insulated wire 34a is connected to one electrode of each light-emitting element 31 on the side of the light-emitting element mounting surface 121 of the support 12, and the second insulated wire 34b is connected to the other electrode of each light-emitting element 31 on the back surface of the support 12 (the surface opposite the light-emitting element mounting surface 121). The first insulated wire 34a and the second insulated wire 34b are pulled out of the insulating layer 36 from at least one of both ends of the longitudinal direction of the support 12, with the support 12 sandwiched between them.

19 is a schematic diagram showing an example of a light-emitting element 31 used in the tenth embodiment. The VCSEL, which is the light-emitting element 31, has a laminated structure in which a semiconductor substrate 401, an n-side reflective film 402, an n-type semiconductor layer 403, an active layer 404, a p-type semiconductor layer 405, and a p-side reflective film 406 are laminated in this order in the -Y direction. The light emission direction is the +Y direction. The p-type and n-type conductivity types may be in an inverse relationship. The semiconductor substrate 401 may be removed. The n-type semiconductor layer 403 has a flat portion and a convex portion protruding from the flat portion in the -Y direction. An active layer 404 is provided on the upper surface of the convex portion of the n-type semiconductor layer 403. A p-type semiconductor layer 405 is provided on the upper surface of the active layer 404, and a p-side reflective film 406 is provided in the upper portion of the p-type semiconductor layer 405 in a region other than the peripheral region. A p-side contact layer may be provided between the p-type semiconductor layer 405 and the p-side reflective film 406.

The light-emitting element 31 includes an insulating layer 407 that covers the upper surface of the flat portion and the side surface of the convex portion of the n-type semiconductor layer 403, the side surface of the active layer 404, and the peripheral area of the side surface and upper surface of the p-type semiconductor layer 405. The light-emitting element 31 includes a p-side electrode 408 electrically connected to the p-type semiconductor layer 405, and an n-side electrode 409 electrically connected to the n-type semiconductor layer 403. The side on which the p-side electrode 408 and the n-side electrode 409 are provided is disposed on the light-emitting element mounting surface 121 of the support 12. A conductive connection layer (or bump) connected to the light-emitting element mounting surface 121 of the support 12 may be provided so that the heights of the p-side electrode 408 and the n-side electrode 409 in the -Y direction are aligned. When the light-emitting element 31 is flip-chip mounted on the support 12 with the conductive connection layer connected to the p-side electrode 408 and the n-side electrode 409, the p-side reflective film 406 does not interfere with the light-emitting element mounting surface of the support 12.

The n-side reflective film 402 and the p-side reflective film 406 may each be formed, for example, from a distributed Bragg reflector (DBR). A DBR has a structure in which multiple high-refractive index layers and multiple low-refractive index layers are alternately stacked. A DBR has a wavelength range of high reflectance called a stop band. The central wavelength and wavelength width of the stop band are determined by the refractive index and thickness of the high-refractive index layer and the refractive index and thickness of the low-refractive index layer. The reflectance in the stop band of a DBR increases with the refractive index difference between the high-refractive index layers and the number of layers stacked.

In the example shown in FIG. 19, a standing wave is formed between the n-side reflecting film 402 and the p-side reflecting film 406. The wavelength of the standing wave in air is within the stop band of the n-side reflecting film 402 and the p-side reflecting film 406, and this wavelength is the oscillation wavelength of the laser light. An integer multiple of half the oscillation wavelength is equal to the optical distance between the reflective surfaces of the n-side reflecting film 402 and the p-side reflecting film 406, which face each other. The optical distance is the distance obtained by multiplying the distance that light actually propagates through a certain medium by the refractive index of the medium. By applying a forward voltage between the p-side electrode 408 and the n-side electrode 409, a current can be injected into the active layer 404. The current injection causes a population inversion in the active layer 404, and light amplification by stimulated emission at the oscillation wavelength, that is, laser oscillation, occurs. As described above, the VCSEL of this embodiment is assumed to have the p-side electrode 408 and the n-side electrode 409 side as the mounting surface, and to extract laser light from the semiconductor substrate 401 side.

Note that the configuration of the VCSEL shown in FIG. 19 is an example. The components included in the VCSEL may be formed from known materials. The shape of some of the components included in the VCSEL may be changed, and other components may also be included. The VCSEL may be configured to extract laser light from the side opposite the semiconductor substrate 401.

20A is a perspective view of the light-emitting element mounting surface 121 side of the support 12 used in the tenth embodiment, and FIG. 20B is a perspective view of the back surface 122 side of the support. Here, the surface opposite the light-emitting element mounting surface 121 is referred to as the "back surface". Conductive layers 124 and 125 are formed on the light-emitting element mounting surface 121 of the support 12. The conductive layer 124 is formed on the light-emitting element mounting surface 121 of the support 12 and is electrically insulated from the conductive layer 125. The conductive layer 124 has a connection region 124c that is connected to one electrode of the light-emitting element 31, and a wide portion 124w that is wider than the connection region 124c at the end of the -Z side of the support 12. The wide portion 124w is used for electrical connection with the first insulated wire 34a. The conductive layer 125 is formed from the side surface of the support 12 to the back surface 122.

The p-side electrode 408 and n-side electrode 409 of the light-emitting element 31 are connected to the conductive layers 124 and 125 of the light-emitting element mounting surface 121, respectively, via conductive connection layers (or bumps). The wide portion 124w of the conductive layer 124 is electrically connected to the first insulated wire 34a. A portion of the insulating coating of the first insulated wire 34a is removed, and the internal metal wiring is connected to the conductive layer 124. On the back surface 122 of the support 12, the conductive layer 125 is electrically connected to the second insulated wire 34b. A portion of the insulating coating of the second insulated wire 34b is removed, and the internal metal wiring is connected to the conductive layer 125.

The first insulated wire 34a and the second insulated wire 34b are arranged to sandwich the support 12 and extend in the longitudinal direction (Z direction) of the support, and do not interfere with the light emission of the VCSEL. In the arrangement configuration of FIG. 18, the second insulated wire 34b connected to the rear surface 122 of the support 12 may be extended to the vicinity of the tip of the support 12 on the +Z side. The first insulated wire 34a and the second insulated wire 34b protruding from the insulating layer 36 in the -Z direction are cooled by contacting the refrigerant. The support 12 may also protrude from the insulating layer 36 at least at one end in the longitudinal direction and be directly cooled by the refrigerant. The conductive layers 124 and 125 formed on the surface of the support 12 also function as a heat sink.

The VCSEL chip used as the light-emitting element 31 has a side length and height of 200 μm or less, is mounted on the support 12, and is sealed with an insulating layer 36. The overall thickness and width of the light-emitting device 30 are about 0.5 mm, realizing an ultra-compact light-emitting device 30 that can be mounted on a catheter 50. In the example of FIG. 18, the thickness of the insulating layer 36 is thinner than the thickness of the light-emitting element 31.

Figure 21 shows the electrical characteristics and optical output characteristics of the fabricated light irradiation device, and Figure 22 shows the thermal resistance. The characteristics of this light irradiation device were measured by fabricating a sample of the configuration of the eighth embodiment. The light emitting element 11 used had a resonator length (length in the Z direction) of 1.5 mm, a width (length in the X direction) of 0.2 mm, and an oscillation wavelength of 640 nm. The support 12 was an AlN substrate with a thickness (length in the Y direction) of 0.1 mm. The mirror was a silver mirror, with a bottom surface size (length x width) of 0.3 mm x 0.2 mm and a height of 0.2 mm. The first insulated wire 14a and the second insulated wire 14b were polyurethane copper wires with a diameter of 0.1 mm and a length of 1.5 m. The insulating layer 16 was a polysilazane coat.

The horizontal axis of Figure 21 is the current value [mA] applied through the insulated wire 14, the vertical axis on the left is the optical output [mW], and the vertical axis on the right is the voltage [V]. The black marks in the figure indicate the current vs. optical output characteristics, and the white marks indicate the current vs. voltage characteristics. The optical output increases as the current increases, and an optical power of 30 mW is obtained with an injection current of 100 mA.

The horizontal axis of FIG. 22 is time [seconds], and the vertical axis is thermal resistance [K/W]. The thermal resistance saturates about 0.1 seconds after the light irradiation device is turned on. By cooling with the refrigerant 51 while the light irradiation device is in operation, heat can be efficiently released from the support 12, the insulated wire 14, and the insulating layer 16, stabilizing the operation of the light irradiation device.

Although the above description has been based on specific configuration examples, the present disclosure is not limited to the above configuration examples. For example, in the eighth embodiment, the second insulated electric wire 14b that does not interfere with light emission may be drawn out from the tip of the support 12 in the +Z direction to function as a heat dissipation member. In the configuration of the eighth or tenth embodiment, a light detector such as a photodiode may be arranged together with a light emitting element on the light emitting element mounting surface 121 of the support 12 to be used as a biosensor. In the configuration of the tenth embodiment, instead of mounting two light emitting elements 31 on the support 12, one light emitting element 31 and one light receiving element may be mounted. When a two-core enamel wire is used as the insulated electric wires 14 and 34, one metal wiring may be used to supply an electrical signal to the light emitting element 11 or 31, and the other metal wiring may be used as a readout wiring for a signal output from the photodetector.

The light irradiation devices 10 (including 10A and 10B), 20, and 30 of the eighth to tenth embodiments may be used in combination with an endoscope. The light emitting elements 11 and 31 can be used not only as laser light sources for treatment, but also as sensing light sources and illumination light sources. In either case, they have the heat dissipation properties to dissipate heat from the light emitting elements to the outside, and sufficient electrical insulation to ensure insulation in the refrigerant, and are effective as light irradiation devices that can be mounted on catheters. Unlike optical fibers, insulated electric wires with insulating coatings are resistant to bending. In addition, the configuration in which the light emitting elements themselves are mounted on the support 12 has excellent integration properties and a wide range of applications for sensors.

The present disclosure can be used not only as a light irradiation device inserted into a medical catheter, but also in other medical applications. It can also be applied to applications such as sensors that require localized light irradiation in combination with a refrigerant.

The light irradiation devices of the first to seventh embodiments are not limited to those placed inside living bodies for medical purposes, but can also be placed in small spaces inside precision machinery, etc., and used as illumination light sources for inspecting the inside of precision machinery, etc.

Eleventh Embodiment
Fig. 23 is a schematic cross-sectional view showing a first example of the configuration of the light irradiating device 10K of the 11th embodiment. Fig. 24 is a schematic cross-sectional view showing a second example of the configuration of the light irradiating device 10K of the 11th embodiment. Fig. 25 is a schematic cross-sectional view showing a third example of the configuration of the light irradiating device 10K of the 11th embodiment. Figs. 23 to 25 each show a cross section including a central axis C0 along the longitudinal direction P of an elongated light irradiating device 10K having a longitudinal direction P.

Similar to the eighth to tenth embodiments, the light irradiation device 10K is also mounted on a catheter 50 (see Figures 11 and 16) for use, and the light irradiation device 10K and the catheter 50 can form an in vivo light irradiation assembly. In the eleventh embodiment, the light emitting unit 60 has a light emitting element 11 and a support 12-3 that supports the light emitting element 11. The support 12-3 contains a material that is opaque to radiation such as X-rays. For example, the support 12-3 contains Cu-W or Cu-Mo. Since the support 12-3 contains a material that is opaque to radiation such as X-rays, there is no need to provide a separate marker member. The support 12-3 has a notch 12c on the opposite side of the optical component 40 across the light emitting unit 60. Since the support 12-3 itself can serve as a marker member or marker unit, the light irradiation device 10K can be made smaller. The light emitting element 11 is fixed to the support 12-3, and the support 12-3 and the light emitting surface 111 are arranged close to each other, improving the accuracy of the direction of light irradiation. The support 12-3 may be a block made of Cu-W or Cu-Mo. If the support 12-3 is conductive, the support 12-3 itself may also serve as a conductive layer.

The light emitting element 11 is disposed on the first surface 12a, which is the upper surface of the support 12-3. The light emitting element 11 can emit light in a direction along the longitudinal direction P from the light emitting surface 111 that intersects with the longitudinal direction P. In the example shown in FIG. 23, the light emitting element 11 emits light in the +Z direction. In the light irradiation device 10K, the light emitting section 60 includes the light emitting element 11 and the support 12-3, and therefore the support 12-3 can be used as a heat dissipation member that dissipates heat from the light emitting element 11.

The support 12-3 is opaque to radiation such as X-rays, has a notch 12c, and at least one of the shape and position is different when viewed from the first direction Q1 and the second direction Q2. Therefore, when a living body with the light irradiation device 10K placed inside is photographed by X-ray CT or the like, the image of the support 12-3 can be confirmed in the photographed image. By confirming at least one of the shape and position of the image of the support 12-3 reflected in the photographed image by X-ray CT, the orientation of the support 12 placed in the living body can be confirmed. The orientation of the support 12-3 is known with respect to the longitudinal direction P, and the light irradiation device 10K can irradiate light emitted from the light emitting element 11 in a predetermined direction R that intersects with the longitudinal direction P. Therefore, in this embodiment, by using the light irradiation device 10K, the irradiation direction of light from the light irradiation device 10K can be grasped from the orientation of the support 12-3 confirmed based on the photographed image of the X-ray CT.

In the first example shown in FIG. 23, the support 12-3 has a notch 12c, but as in the second example shown in FIG. 24, the support 12-4 may have a protrusion 12d that protrudes in the +Y direction from the first surface 12a, which is the upper surface of the support 12-4. The support 12-4 including the protrusion 12d may be formed as an integral member, or may be formed by joining rectangular parallelepiped members of different sizes. Like the support 12-3, the support 12-4 is opaque to radiation such as X-rays.

Alternatively, as in the third example shown in FIG. 25, the support 12-5 may be used in combination with a marker portion 20D provided on the optical component 40. The support 12-5, like the support 12-3, is opaque to radiation such as X-rays.

This application claims priority based on Japanese Patent Application No. 2023-217446 filed with the Japan Patent Office on December 22, 2023, and Japanese Patent Application No. 2023-217447 filed with the Japan Patent Office on December 22, 2023, and includes the entire contents of these Japanese patent applications.

An embodiment of the present disclosure may include, for example, the following configuration.
<Item 1> An elongated light-irradiation device having a longitudinal direction, comprising: a light-emitting unit; and a marker member that is directly or indirectly connected to the light-emitting unit and has radiopaque properties, wherein the marker member viewed from a first direction in a direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker member viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction, and the light-irradiation device is capable of irradiating light emitted from the light-emitting unit in a predetermined direction intersecting the longitudinal direction.
<Item 2> The light irradiation device according to <Item 1>, wherein the marker member has a long base and at least one of a convex portion and a concave portion provided on a surface of the base.
<Item 3> The light irradiation device according to <Item 1> or <Item 2>, further comprising an optical component that reflects light emitted from the light emitting portion in a direction along the longitudinal direction, in a direction intersecting the longitudinal direction.
<Item 4> The light irradiation device according to any one of <Item 1> to <Item 3>, wherein the light output section has a light emitting element and a support body that supports the light emitting element.
<Item 5> The light irradiation device according to <Item 4>, wherein at least one of the light emitting element and the support is covered with an insulating layer.
<Item 6> The light irradiation device according to <Item 4> or <Item 5>, further comprising an insulated wire electrically connected to the light emitting element, the insulated wire being electrically insulated from the marker member.
<Item 7> The light irradiation device according to any one of <Item 4> to <Item 6>, further comprising: a housing including an opening, into which at least a part of the light-emitting element and at least a part of the support body can be disposed; and a light-transmitting member sealing the opening of the housing, wherein the light-transmitting member transmits light that is emitted from the light emitting portion and is irradiated in a predetermined direction intersecting with the longitudinal direction.
<Item 8> The light irradiation device according to <Item 7>, wherein the light emitting element is disposed inside the housing, and the inside of the housing is hermetically sealed.
<Item 9> An elongated light irradiation device having a longitudinal direction, comprising: a light output section; a support to which the light output section is fixed; and a radiopaque marker section, wherein the marker section viewed from a first direction in a direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker section viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction; the marker section is provided on the support; and the light irradiation device is capable of irradiating light output from the light output section in a predetermined direction intersecting the longitudinal direction.
<Item 10> The light irradiation device according to <Item 9>, wherein the support includes a first surface on which the light emitting portion is arranged and a second surface located opposite to the first surface, and the marker portion is provided on the second surface of the support.
<Item 11> The light irradiation device according to <Item 9> or <Item 10>, wherein a thickness of at least a part of the marker portion is 40 μm or more and 100 μm or less.
<Item 12> The light irradiation device according to any one of <Item 9> to <Item 11>, wherein the support includes a first surface on which the light emitting portion is arranged and a second surface located opposite to the first surface, and a position of the marker portion when viewed from a third direction that is a direction parallel to the first surface is different from a position of the marker portion when the light irradiation device is rotated 180 degrees around a central axis of the light irradiation device that is parallel to the longitudinal direction as an axis of rotation and viewed from the third direction by twice or more of a distance between the first surface and the second surface of the support.
<Item 13> The light irradiation device described in any one of <Item 9> to <Item 12>, wherein the support includes a first surface on which the light emitting portion is arranged and a second surface located opposite to the first surface, the marker portion is provided on both the first surface and the second surface, and the marker portion provided on the first surface differs from the marker portion provided on the second surface in at least one of a size and a position of the marker portion.
<Item 14> The light irradiation device according to any one of <Item 9> to <Item 13>, wherein the light emitting portion is a light emitting element, and the light emitting element is disposed on the support body.
<Item 15> The light irradiation device according to any one of <Item 9> to <Item 14>, wherein the light emitting portion is a fiber, and the fiber is disposed on the support body.
<Item 16> The light irradiation device described in <Item 14>, wherein the support includes a first surface on which the light emitting portion is arranged and a second surface located opposite to the first surface, the second surface of the support includes a first region and a second region different from the first region, the marker portion is provided in the first region, and an insulated wire is arranged in the second region.
<Item 17> An elongated light irradiation device having a longitudinal direction, comprising: a light emitting section; a support to which the light emitting section is fixed; an optical component that imparts at least one of optical effects of reflection, refraction, and diffraction to light emitted from the light emitting section; and a marker section having radiopacity, wherein the marker section viewed from a first direction in a direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker section viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction; the marker section is provided on the optical component; and the light irradiation device is capable of irradiating the light emitted from the light emitting section in a predetermined direction intersecting the longitudinal direction.
<Item 18> The light irradiation device according to <Item 17>, wherein the light emitting portion emits the light in a direction along the longitudinal direction, the optical component includes a reflective surface that reflects the light from the light emitting portion in a direction intersecting the longitudinal direction, and the marker portion is provided in a region of the optical component other than a region where the reflective surface is provided.
<Item 19> The light irradiation device according to <Item 17>, further comprising, in addition to the marker portion, a second marker portion in a portion other than the support body and the optical component.
<Item 20> The light irradiation device according to any one of <Item 17> to <Item 19>, wherein the support body and the optical component are integrally formed.
<Item 21> An elongated light irradiation device having a longitudinal direction, comprising: a light emitting unit having a light emitting element and a support supporting the light emitting element, the support containing a member having radiopaque properties, the support viewed from a first direction in a direction perpendicular to the longitudinal direction differs in at least one of a shape and a position from the support viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction, and the light irradiation device being capable of irradiating light emitted from the light emitting unit in a predetermined direction intersecting the longitudinal direction.

10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10J, 10K, 20, 30 Light irradiation device 11, 31 Light emitting element 111 Light emitting surface 12, 12-1, 12-2, 12-3, 12-4 Support 12a First surface 12b Second surface 12b1 First region 12b2 Second region 12c Notch 12d Protrusion 121 Light emitting element mounting surface 122 Back surface 124, 125 Conductive layer 14, 24, 34 Insulated wire 14a, 24a, 34a First insulated wire 14b, 24b, 34b Second insulated wire 16, 16A, 16B, 26, 36 Insulating layer 17, 27 Optical component 18 Fiber 20A marker member 20D marker portion 20J second marker portion 20v first position 20u second position t1 thickness t2, d distance 30A housing 31A opening 32 light-transmitting member 40 optical component 41 reflecting surface 42 surface 50 catheter 51 refrigerant 60 light emitting portion 100, 200 in-vivo light irradiation assembly Q1 first direction Q2 second direction Q3 third direction P longitudinal direction R direction

Claims (21)

An elongated light irradiation device having a longitudinal direction,
A light emitting portion;
A marker member that is directly or indirectly connected to the light emitting portion and has radiopacity;
The marker member viewed from a first direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker member viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction;
A light irradiation device capable of irradiating light emitted from the light emitting portion in a predetermined direction intersecting the longitudinal direction. The marker member is
A long base and
The light irradiation device according to claim 1 , further comprising at least one of a convex portion and a concave portion provided on a surface of the base. The light irradiation device according to claim 1 or 2, further comprising an optical component that reflects light emitted from the light emitting portion in a direction along the longitudinal direction in a direction intersecting the longitudinal direction. The light irradiation device according to any one of claims 1 to 3, wherein the light emitting section has a light emitting element and a support that supports the light emitting element. The light irradiation device according to claim 4, wherein at least one of the light emitting element and the support is covered with an insulating layer. an insulated wire electrically connected to the light-emitting element;
The light irradiation device according to claim 4 or 5, wherein the insulated wire and the marker member are electrically insulated from each other. a housing including an opening, in which at least a portion of the light emitting element and at least a portion of the support body can be disposed;
a light-transmitting member that seals the opening of the housing,
The light illumination device according to claim 4 , wherein the light-transmitting member transmits light that is emitted from the light emitting portion and is irradiated in a predetermined direction intersecting the longitudinal direction. The light emitting element is disposed inside the housing,
The light irradiation device according to claim 7 , wherein the inside of the housing is hermetically sealed. An elongated light irradiation device having a longitudinal direction,
A light emitting portion;
A support to which the light emitting portion is fixed;
A marker portion having radiopacity,
The marker portion viewed from a first direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker portion viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction;
The marker portion is provided on the support,
A light irradiation device capable of irradiating light emitted from the light emitting portion in a predetermined direction intersecting the longitudinal direction. The support is
A first surface on which the light emitting portion is disposed;
a second surface located opposite the first surface,
The light irradiation device according to claim 9 , wherein the marker portion is provided on the second surface of the support body. The light irradiation device according to claim 9 or 10, wherein the thickness of at least a portion of the marker portion is 20 μm or more and 100 μm or less. The support is
A first surface on which the light emitting portion is disposed;
a second surface located opposite the first surface,
12. The light irradiation device according to claim 9, wherein a position of the marker part when viewed from a third direction that is a direction parallel to the first surface is different from a position of the marker part when the light irradiation device is rotated 180 degrees around a central axis of the light irradiation device that is parallel to the longitudinal direction as an axis of rotation and viewed from the third direction by twice or more of a distance between the first surface and the second surface of the support. The support is
A first surface on which the light emitting portion is disposed;
a second surface located opposite the first surface,
The marker portion is provided on both the first surface and the second surface,
13. The light irradiation device according to claim 9, wherein the marker portion provided on the first surface is different from the marker portion provided on the second surface in at least one of a size and a position of the marker portion. the light emitting unit is a light emitting element,
The light irradiation device according to claim 9 , wherein the light emitting element is disposed on the support. the light output portion is a fiber;
15. The light emitting device according to any one of claims 9 to 14, wherein the fibre is arranged on the support. The support is
A first surface on which the light emitting portion is disposed;
a second surface located opposite the first surface,
The second surface of the support includes a first region and a second region different from the first region,
The marker portion is provided in the first region,
The light illumination device of claim 14 , wherein an insulated wire is disposed in the second region. An elongated light irradiation device having a longitudinal direction,
A light emitting portion;
A support to which the light emitting portion is fixed;
an optical component that imparts at least one optical effect of reflection, refraction, or diffraction to the light emitted from the light emitting portion;
A marker portion having radiopacity,
The marker portion viewed from a first direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the marker portion viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction;
The marker portion is provided on the optical component,
A light irradiation device capable of irradiating the light emitted from the light emitting portion in a predetermined direction intersecting the longitudinal direction. The light emitting portion emits the light in a direction along the longitudinal direction,
the optical component includes a reflecting surface that reflects the light from the light emitting portion in a direction intersecting the longitudinal direction,
The light irradiation device according to claim 17 , wherein the marker portion is provided in an area of the optical component other than an area where the reflective surface is provided. The light irradiation device according to claim 17, further comprising, in addition to the marker portion, a second marker portion on a portion other than the support and the optical component. The light irradiation device according to any one of claims 17 to 19, wherein the support and the optical component are integrally formed. An elongated light irradiation device having a longitudinal direction,
a light emitting portion having a light emitting element and a support for supporting the light emitting element;
The support contains a radiopaque material,
The support as viewed from a first direction perpendicular to the longitudinal direction has at least one of a shape and a position different from that of the support as viewed from a second direction perpendicular to the longitudinal direction, the second direction being different from the first direction;
A light irradiation device capable of irradiating light emitted from the light emitting portion in a predetermined direction intersecting the longitudinal direction.

Images