WO2024185731A1 - 光拡散装置及びこれを備える医療用カテーテルセット - Google Patents
光拡散装置及びこれを備える医療用カテーテルセット Download PDFInfo
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- WO2024185731A1 WO2024185731A1 PCT/JP2024/007982 JP2024007982W WO2024185731A1 WO 2024185731 A1 WO2024185731 A1 WO 2024185731A1 JP 2024007982 W JP2024007982 W JP 2024007982W WO 2024185731 A1 WO2024185731 A1 WO 2024185731A1
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- light
- optical fiber
- cladding
- diffusion device
- tip
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/07—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements using light-conductive means, e.g. optical fibres
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
- A61B18/22—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
- A61B18/24—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor with a catheter
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
Definitions
- the present invention relates to a light diffusion device for use in medical equipment and a medical catheter set equipped with the same.
- a conventional light diffusion device includes an optical fiber consisting of a core located at the center in the radial direction and a cladding located on the outer periphery of the core, and that emits laser light incident on the base end of the optical fiber from the tip end and the outer periphery on the tip side (see, for example, Patent Document 1).
- the optical fiber of the conventional light diffusion device has a light transmission section that transmits the laser light incident on the base end, and a light emission section at the tip side that emits the laser light transmitted through the light transmission section.
- Light diffusion devices are used in photoimmunotherapy, a cancer treatment method, by inserting the tip of an optical fiber into the human body and irradiating laser light onto drugs that have been administered to the body and reached the cancer cells. Light diffusion devices are also used by inserting them into the body together with endoscopes such as gastroscopes and catheters to irradiate the inside of the body or project light from inside the body onto its surface.
- endoscopes such as gastroscopes and catheters
- Conventional light diffusion devices emit light from the outer surface of the light output section by partially removing the cladding at the tip side of the optical fiber to expose the core.
- the difference between the refractive index of the core at the light output section and the refractive index of the air located on the outer periphery of the core becomes large, and the light confinement effect becomes stronger.
- the laser light emitted from the light output section has a limited emission intensity throughout the entire light output section.
- one of the objectives is to provide a light diffusion device that can efficiently emit light transmitted through a light transmission section in a specific direction on the side, and a medical catheter set equipped with the same.
- a light diffusing device is a light diffusing device comprising an optical fiber having a core located at a radial center side and a clad located on an outer peripheral side of the core, the light diffusing device causing light incident on a base end of the optical fiber to exit from a tip end side of the optical fiber, a light transmitting section that transmits light incident from a base end section toward a tip end section, and a light emitting section that is formed by removing a portion located on an outer circumferential side of the clad on the tip side,
- the outer diameter Db of the cladding in the light emitting portion is smaller than the outer diameter Da of the cladding in the light transmitting portion by at least the wavelength ⁇ of the light transmitted through the light transmitting portion (Db ⁇ Da ⁇ ), and
- the optical fiber has an end face at an angle to a plane perpendicular to the axis of the core at the end on the tip side.
- the thickness t of the cladding in the light emitting portion may be 1 ⁇ m or more in an area that accounts for 30% or more of the total area of the light emitting portion.
- the light emitting portion may extend to a region adjacent to the end face at the tip side of the optical fiber.
- the end face may be continuous in the circumferential direction of the optical fiber, and may have a conical shape.
- the angle between the end face and a plane perpendicular to the axis of the core may be less than the minimum angle at which light transmitted through the optical transmission section is totally reflected.
- the optical fiber may be made of resin.
- the numerical aperture (NA) of the optical fiber may be 0.5 or more.
- the outer surface of the optical fiber in the light emitting section may be uneven.
- the medical catheter set according to one aspect of the present invention includes a catheter and the light diffusion device according to one aspect of the present invention.
- a light diffusion device that can efficiently emit light transmitted through a light transmission section in a specific direction on the side, and a medical catheter set that includes the same.
- FIG. 1 is a schematic diagram of a light diffusing device according to a first embodiment which is an exemplary aspect of the present invention.
- 5 is a cross-sectional view of a light exit portion of an optical fiber in the light diffusing device according to the first embodiment and a main portion in the vicinity thereof, taken along the line AA in FIGS. 3 and 4.
- FIG. 3 is a cross-sectional view of a portion of a light transmitting portion of an optical fiber in the light diffusing device according to the first embodiment, taken along the CC cross section in FIG. 2.
- 3 is a cross-sectional view of a portion of a light exit portion of an optical fiber in the light diffusing device according to the first embodiment, taken along the line DD in FIG. 2.
- FIG. 3 is an enlarged horizontal cross-sectional view of a main part of a light emitting portion of an optical fiber in the light diffusing device according to the first embodiment.
- FIG. 3 is an enlarged cross-sectional view of a light exit portion of an optical fiber in the light diffusing device according to the first embodiment and its vicinity.
- FIG. 2 is an enlarged perspective view of a light exit portion of an optical fiber and its vicinity in the light diffusing device according to the first embodiment;
- FIG. 11 is a cross-sectional view of a light exit portion of an optical fiber in a light diffusing device according to a second embodiment and a main portion in the vicinity thereof.
- FIG. 11 is an enlarged cross-sectional view of a light exit portion of an optical fiber in a light diffusing device according to a second embodiment and its vicinity.
- FIG. 13 is a plan view of a light diffusing device according to a second embodiment, as viewed from the tip side of an optical fiber.
- FIG. 13 is a cross-sectional view of a light exit portion of an optical fiber in a light diffusing device according to a third embodiment and its vicinity.
- FIG. 13 is an enlarged cross-sectional view of a light exit portion of an optical fiber and its vicinity in a light diffusing device according to a third embodiment.
- FIG. 13 is an enlarged perspective view of a light exit portion of an optical fiber and its vicinity in a light diffusing device according to a third embodiment.
- FIG. 1 is a schematic diagram showing an example of use of a medical catheter set including a light diffusing device according to a first embodiment.
- 11 is a cross-sectional view showing a modified example of a light exit portion of an optical fiber in a light diffusing device according to an embodiment.
- FIG. 11 is a schematic diagram showing an example of use of a medical catheter set including a light diffusing device according to a first embodiment.
- 11 is a cross-sectional view showing a modified example of a light exit portion of an optical fiber in a light diffusing device according to an embodiment.
- Fig. 1 is a schematic diagram of a light diffusing device 1 according to a first embodiment
- Fig. 2 is a cross-sectional view of a light emitting portion of an optical fiber in the light diffusing device 1 and a main portion in the vicinity thereof
- Fig. 3 is a cross-sectional view of a portion of a light transmitting portion of an optical fiber in the light diffusing device 1
- Fig. 4 is a cross-sectional view of a portion of a light emitting portion of an optical fiber in the light diffusing device
- Fig. 5 is an enlarged horizontal cross-sectional view of a main portion of the light emitting portion of an optical fiber in the light diffusing device 1.
- the base end side of the optical fiber is indicated by an arrow B, and the tip side is indicated by an arrow T.
- Fig. 2 is a cross-sectional view taken along the line A-A in Figs. 3 and 4
- Fig. 3 is a cross-sectional view taken along the line C-C in Fig. 2
- Fig. 4 is a cross-sectional view taken along the line D-D in Fig. 2.
- Fig. 6 is an enlarged cross-sectional view of the light emitting portion of the optical fiber in the light diffusion device 1 and its vicinity
- Fig. 7 is a perspective view thereof.
- the light diffusion device 1 is a device that emits light incident on the base end 20BE of the optical fiber 20 from the tip side T, and a light source 10 for generating light is connected to the base end 20BE on the base end side B of the optical fiber 20.
- the light source 10 generates visible light or laser light. When generating laser light, it has a semiconductor laser, and generates laser light by passing electricity through the semiconductor laser to cause laser oscillation.
- the light source 10 generates, for example, red laser light having a wavelength of 670 nm or more and 700 nm or less.
- the optical fiber 20 is made of a resin (plastic) member. As shown in Figures 2 to 4, the optical fiber 20 is a single-core optical fiber consisting of a core 21 located in the center in the radial direction and a cladding 22 located on the outer periphery of the core 21.
- the relative refractive index difference between the core 21 and the cladding 22 of the optical fiber 20 is 2% or more and 11% or less.
- the optical fiber 20 has a core 21 made of acrylic resin (PMMA) with a refractive index of 1.40.
- the cladding 22 is made of fluororesin, and the refractive index is adjusted to a range of 1.35 to 1.40 depending on the composition.
- the optical fiber 20 has, for example, an outer diameter of 500 ⁇ m, an outer diameter of the core 21 of 480 ⁇ m, and a thickness of the cladding 22 of 10 ⁇ m.
- the outer diameter of the cladding 22 of the optical fiber 20 is 102 ⁇ m or more and 1100 ⁇ m or less.
- the outer diameter of the core 21 of the optical fiber 20 is 100 ⁇ m or more and 1000 ⁇ m or less.
- the thickness of the cladding 22 is 1 ⁇ m or more and 50 ⁇ m or less.
- the numerical aperture (NA) of the optical fiber 20 used is preferably 0.5 or more, and more preferably 0.6 or more.
- the optical fiber 20 has a light transmitting section 20a that transmits the laser light incident from the base end 20BE toward the tip side T, and a light emitting section 20b that emits the laser light transmitted through the light transmitting section 20a from the outer circumferential surface by removing a portion located on the outer circumferential side of the cladding 22 within a predetermined range in the extension direction of the tip side T.
- the light emitting portion 20b is formed within a range of, for example, 10 mm to 30 mm on the tip side T of the optical fiber 20.
- the outer peripheral surface of the light emitting portion 20b has a cylindrical outer peripheral surface shape.
- the light emitting portion 20b is formed by removing only the outer peripheral side of the cladding 22 by, for example, etching, while leaving the inner peripheral side in the thickness direction of the cladding 22.
- the outer diameter Db of the cladding 22b in the light emitting portion 20b is defined as the diameter of the minimum circumscribing circle MCC, which is a circle that passes through the apex of the uneven surface 22f formed along the circumferential direction of the outer peripheral surface.
- the light emitting portion 20b is formed so that the diameter Db of the minimum circumscribing circle MCC is smaller than the diameter Da of the cladding 22a in the light transmitting portion 20a by at least the wavelength ⁇ of the laser light transmitted through the light transmitting portion 20a (Db ⁇ Da- ⁇ ).
- the diameter Da of the cladding 22a in the optical transmission section 20a is 500 ⁇ m and the wavelength ⁇ of the laser light is 680 nm (0.68 ⁇ m)
- the diameter Db of the minimum circumscribed circle MCC of the cladding 22b in the optical emission section 20b is formed to a size of 499.32 ⁇ m or less (Db ⁇ 500-0.68).
- the maximum thickness Tb max of the cladding 22b in the light emitting portion 20b is smaller than the thickness Ta of the cladding 22a in the light transmitting portion 20a (Tb max ⁇ Ta). It is preferable that the maximum thickness Tb max of the cladding 22b in the light emitting portion 20b is smaller than the thickness Ta of the cladding 22a in the light transmitting portion 20a by at least the wavelength ⁇ of the light transmitted through the light transmitting portion 20a (Tb max ⁇ Ta- ⁇ ).
- the average thickness Tb of the cladding 22b in the light emitting portion 20b is preferably smaller than the thickness Ta of the cladding 22a in the light transmitting portion 20a by at least the wavelength ⁇ of the laser light transmitted through the light transmitting portion 20a (Tb ⁇ Ta - ⁇ ).
- the average thickness Tb of the cladding 22b in the light emitting portion 20b is formed to a size of 9.32 ⁇ m or less (Tb ⁇ 10 - 0.68).
- the change in the structure of the wavelength order in the longitudinal direction of the optical fiber causes the light intensity distribution of the cross section of the optical fiber to change more in the cladding portion, and more laser light is emitted from the outer peripheral surface of the light emitting portion 20b.
- the uneven surface 22f formed along the circumferential direction of the cladding 22b in the light emitting portion 20b has a height difference Hb between the portion where the size of the projection toward the outer periphery is greatest and the portion where the size of the projection is least, which is equal to or less than the wavelength ⁇ of the laser light transmitted through the light transmitting portion 20a (Hb ⁇ ).
- the thickness t of the cladding 22b in the light emitting portion 20b is preferably 1 ⁇ m or more (t ⁇ 1 ⁇ m) in an area that is 30% or more of the total area of the light emitting portion 20b. If the cladding 22b becomes too thin or disappears completely, the light in the core 21 will be trapped instead, so it is desirable to leave a certain thickness.
- the percentage of the total area of the light emitting portion 20b where the thickness t of the cladding 22b in the light emitting portion 20b is 1 ⁇ m or more (t ⁇ 1 ⁇ m) can be calculated by observing multiple cross sections of the cut optical fiber using a scanning electron microscope (SEM) or the like, determining the percentage of the total length of the area with cladding of t ⁇ 1 ⁇ m to the total circumference, and averaging these.
- SEM scanning electron microscope
- optical fiber 20 is cut in multiple places (e.g., three places) in region 20b, and the cross sections are observed with an SEM. Then, the ratio of the region with cladding t ⁇ 1 ⁇ m to the total circumference is calculated, and the average of the obtained values is calculated.
- the tip 20TE of the optical fiber 20 has an end face 20e that is oblique to the plane P perpendicular to the axis 21A of the core 21.
- the end face 20e can be provided by cutting the optical fiber 20 at an angle in the middle.
- the angle ⁇ between the plane P and the end face 20e can be greater than or less than the minimum angle at which the laser light transmitted by the optical fiber 20 is totally reflected, but by making the angle ⁇ less than the minimum angle at which the laser light transmitted by the optical fiber 20 is totally reflected, the laser light can leak in the opposite direction to the reflection direction.
- the laser light when the light source 10 is operated to cause laser light to be incident on the base end 20BE of the optical fiber 20, the laser light is transmitted through the light transmitting section 20a and emitted from the light emitting section 20b.
- the tip end 20TE of the optical fiber 20 In the light emitting section 20b, the tip end 20TE of the optical fiber 20 has an end face 20e that is inclined with respect to the plane P perpendicular to the axis 21A of the core 21 as described above, and the laser light is reflected by the end face 20e.
- the laser light reflected by the end face 20e is irradiated laterally as shown by the arrow L2 in FIG. 2. Therefore, the efficiency of irradiating the laser light laterally can be improved (effect 1).
- the outer diameter Db of the cladding 22b in the light emitting portion 20b is smaller than the outer diameter Da of the cladding 22a in the light transmitting portion 20a by at least the wavelength ⁇ of the light transmitted through the light transmitting portion 20a (Db ⁇ Da ⁇ ).
- the laser light is irradiated laterally as shown by the arrow L1 in FIG. 2 (Effect 2).
- the cladding 22b is thinned and the tip 20TE of the optical fiber 20 has an oblique end face 20e cut at an angle, so the diameter of the optical fiber 20 is narrowed, making it difficult to confine light within the optical fiber 20. This makes it easier for light to leak out from the sides, and as a result, the efficiency of irradiating the laser light to the sides can be improved (Effect 3).
- this embodiment does not merely combine the side illumination effect (effect 1) of cutting the tip 20TE of the optical fiber 20 at an angle with the side illumination effect (effect 2) of appropriately thinning the cladding 22b in the light emitting portion 20b, but also provides a new, complex side illumination effect (effect 3) by organically linking the two configurations.
- the new composite side irradiation effect (Effect 3) has a greater impact than the side irradiation effect (Effect 2) based on the thinning of the cladding.
- the side irradiation based on the thinning of the cladding results in the irradiation area extending in the axial 21A direction (longitudinal direction) of the optical fiber 20.
- the length of the light emitting portion 20b formed by thinning the cladding 22 in the axial 21A direction (longitudinal direction) is short.
- the light emitting portion 20b is preferably formed within a range of, for example, 40 mm or less from the tip side T of the optical fiber 20, and more preferably within a range of 10 mm or less.
- the light emitting portion 20b formed by thinning the cladding 22 extends to a region adjacent to the end face 20e at the tip side T of the optical fiber 20.
- Fig. 8 is a cross-sectional view of the light output portion of the optical fiber and its vicinity in the light diffusing device 2 according to the second embodiment
- Fig. 9 is an enlarged cross-sectional view of the light output portion of the optical fiber and its vicinity in the light diffusing device 2
- Fig. 10 is a plan view (viewed from the right side on the paper surface of Figs. 8 and 9) seen from the tip side of the optical fiber in the light diffusing device 2. Since the light diffusing device 2 according to this embodiment has a configuration almost similar to that of the light diffusing device 1 according to the first embodiment, refer to Fig. 1 for an outline of the light diffusing device 2.
- the E-E cross section in FIG. 8 is the same as FIG. 4, and the F-F cross section is the same as FIG. 3, so please refer to FIG. 3 and FIG. 4 for these cross sections.
- the light diffusion device 2 according to the second embodiment has the same configuration as the light diffusion device 1 according to the first embodiment, except that the shape of the tip portion 20TE of the optical fiber 20 is unique to this embodiment. Therefore, the members having the same functions as the light diffusion device 1 according to the first embodiment are given the same reference numerals as in FIG. 1 to FIG. 7, and their description will be omitted.
- the tip 20TE of the optical fiber 20 has a pair (two) end faces 20e1 and 20e2 that are inclined with respect to a plane P perpendicular to the axis 21A of the core 21.
- the angle ⁇ between the plane P and the end face 20e1, and the angle ⁇ between the plane P and the end face 20e2 can both be greater than or less than the minimum angle at which the laser light transmitted by the optical fiber 20 is totally reflected.
- the laser light when the light source 10 is operated to cause laser light to be incident on the base end 20BE of the optical fiber 20, the laser light is transmitted through the light transmitting section 20a and emitted from the light emitting section 20b.
- the tip end 20TE of the optical fiber 20 In the light emitting section 20b, the tip end 20TE of the optical fiber 20 has a pair of end faces that are inclined with respect to the plane P perpendicular to the axis 21A of the core 21 as described above, and is reflected by the end faces 20e1 and 20e2.
- the reflected laser light travels in the directions of the arrows L21 and L22 , respectively. Therefore, in the present embodiment, the irradiation efficiency of the laser light in two lateral directions, one direction and the opposite direction, can be improved (Effect 1).
- the outer diameter Db of the cladding 22b at the light output portion 20b is smaller than the outer diameter Da of the cladding 22a at the light transmission portion 20a by at least the wavelength ⁇ of the light transmitted through the light transmission portion 20a (Db ⁇ Da ⁇ ).
- the laser light is irradiated laterally in two directions, that is, the one direction and the opposite direction, as shown by the arrow L1 in FIG. 8 (Effect 2).
- the cladding 22b is thinned and the tip 20TE of the optical fiber 20 is cut at an angle to have the slanted end faces 20e1 and 20e2, so the diameter of the optical fiber 20 is narrowed, making it difficult to confine light and easier for it to leak out from the sides, thereby improving the efficiency of lateral laser light irradiation (Effect 3).
- the remarkable effects are the lateral irradiation effect (effect 1) obtained by cutting the tip 20TE of the optical fiber 20 at an angle, the lateral irradiation effect (effect 2) obtained by appropriately thinning the cladding 22b in the light emitting portion 20b, and the new composite lateral irradiation effect (effect 3) obtained by organically linking these configurations.
- the irradiation efficiency of the laser light can be improved in two lateral directions, one direction and the opposite direction.
- the light diffusion device 2 according to this embodiment is used for irradiating the inside of a body or projecting light from inside the body onto the body surface
- the light diffusion device 2 according to this embodiment is particularly suitable for the above-mentioned applications.
- the number of obliquely cut end faces at the tip 20TE of the optical fiber 20 is not limited to two as in this embodiment, and may be three or more.
- Fig. 11 is a cross-sectional view of a main part of a light output portion of an optical fiber and its vicinity in a light diffusing device 3 according to the third embodiment
- Fig. 12 is an enlarged cross-sectional view of a light output portion of an optical fiber and its vicinity in the light diffusing device 3
- Fig. 13 is a perspective view of a light output portion of an optical fiber and its vicinity in the light diffusing device 3. Since the light diffusing device 3 according to this embodiment has a configuration substantially similar to that of the light diffusing device 1 according to the first embodiment, refer to Fig. 1 for an outline of the light diffusing device 3.
- the G-G cross section in FIG. 11 is the same as FIG. 4, and the H-H cross section is the same as FIG. 3, so please refer to FIG. 3 and FIG. 4 for these cross sections.
- the light diffusion device 3 according to the third embodiment has the same configuration as the light diffusion device 1 according to the first embodiment, except that the shape of the tip portion 20TE of the optical fiber 20 is unique to this embodiment. Therefore, the members having the same functions as the light diffusion device 1 according to the first embodiment are given the same reference numerals as in FIG. 1 to FIG. 7, and their description will be omitted.
- the tip 20TE of the optical fiber 20 has an end face 20e3 that is continuous in the circumferential direction of the optical fiber 20 and has a conical shape.
- the angle ⁇ between the plane P and the end face 20e3 can be greater than or less than the minimum angle at which the laser light transmitted by the optical fiber 20 is totally reflected.
- the laser light when the light source 10 is operated to cause laser light to enter the base end 20BE of the optical fiber 20, the laser light is transmitted through the light transmitting section 20a and emitted from the light emitting section 20b.
- the tip end 20TE of the optical fiber 20 In the light emitting section 20b, the tip end 20TE of the optical fiber 20 has an end face 20e3 that is continuous in the circumferential direction of the optical fiber 20 and has a conical shape as described above, and is reflected by the end face 20e3.
- the reflected laser light travels radially in the direction of the arrow L3 that intersects with the axis 21A. Therefore, in this embodiment, the irradiation efficiency of the laser light that travels radially to the side can be improved (Effect 1).
- the outer diameter Db of the cladding 22b in the light emitting portion 20b is smaller than the outer diameter Da of the cladding 22a in the light transmitting portion 20a by at least the wavelength ⁇ of the light transmitted through the light transmitting portion 20a (Db ⁇ Da ⁇ ).
- the laser light is irradiated radially to the side, as shown by the arrow L1 in FIG. 11 (Effect 2).
- the cladding 22b is thinned and the tip 20TE of the optical fiber 20 has an oblique end face 20e3 cut at an angle, so the diameter of the optical fiber 20 is narrowed, making it difficult to confine light and allowing it to easily leak out radially to the side, improving the irradiation efficiency of the laser light that travels radially to the side (Effect 3).
- the remarkable effects are the lateral irradiation effect (effect 1) obtained by cutting the tip 20TE of the optical fiber 20 at an angle, the lateral irradiation effect (effect 2) obtained by appropriately thinning the cladding 22b in the light emitting portion 20b, and the new composite lateral irradiation effect (effect 3) obtained by organically linking these configurations.
- the end face 20e3 is continuous in the circumferential direction of the optical fiber 20 and has a conical shape, so that the irradiation efficiency of the laser light can be improved for the entire lateral circumference.
- the light diffusion device 3 of this embodiment when the light diffusion device 3 of this embodiment is used for irradiating the inside of a body or projecting light from inside the body onto the body surface, irradiation is performed radially in the entire circumferential direction centered on the axis 21A of the optical fiber 20, so there is no need to align the irradiation position in the rotational direction centered on the axis 21A. Therefore, the light diffusion device 3 of this embodiment is particularly suitable for the above-mentioned applications.
- the light diffusion device according to the embodiment described above can be inserted into the body as it is or together with other accessories as appropriate, and used as a diffuser for irradiating an affected area with laser light.
- the light diffusion device according to the embodiment described above can also be inserted into the body together with an endoscope, catheter, or the like, and used as a so-called light source to illuminate the inside of the body or project light onto the body surface from inside the body.
- an endoscope, catheter, or the like used as a so-called light source to illuminate the inside of the body or project light onto the body surface from inside the body.
- FIG. 14 is a schematic diagram showing an example of the use of a medical catheter set 30 when the light diffusion device 1 according to the first embodiment is used together with a catheter.
- the medical catheter set 30 includes a catheter 26 and a light diffusion device 1, and as shown in FIG. 14, when in use, the optical fiber 20 of the light diffusion device 1 is inserted into the catheter 26 and is available to the practitioner.
- the medical catheter set 30 can be inserted into the body together with an endoscope from the tip side T, and the tip of the catheter 26 can be guided to the desired location while observing the inside of the body with the endoscope by irradiating light from the light emitting unit 20b.
- the catheter can be inserted into the body without an endoscope, and light can be irradiated into the body from the light emitting unit 20b and projected onto the body surface, allowing the position of the tip of the catheter 26 to be confirmed from outside the body while the tip position is guided to the desired location.
- the practitioner can pull out the optical fiber 20 of the light diffusion device 1 from the catheter 26 and use the catheter 26 for the desired medical purpose to perform the medical procedure.
- the tip 20TE of the optical fiber 20 is used in a state where it is fitted inside the tube of the catheter 26. If a tube made of a light-impermeable material is used as the catheter 26, the tip 20TE of the optical fiber 20 may be protruded from the tip of the catheter 26 to expose at least a part of the light emitting portion 20b, or the tip 20TE of the optical fiber 20 may be positioned near the tip opening of the catheter 26 to allow the light emitted from the light emitting portion 20b to leak out from the tip opening of the catheter 26.
- the portion of the light emitting portion 20b located on the outer periphery of the clad 22 is removed in the circumferential direction, but this is not limited to the above.
- an optical fiber that emits laser light from the outer periphery of the light emitting portion 20b as shown in FIG. 15, only a portion of the portion of the light emitting portion 20b located on the outer periphery of the clad 22 may be removed in the circumferential direction, so that the laser light is emitted from only a portion of the circumferential direction.
- the light emitting portion is formed in at least a portion of the circumferential direction on the tip side of the optical fiber.
- the light emitting portion may be formed in a portion that covers 30% or more of the circumference of the tip side of the optical fiber, for example, within a range of 120 degrees to 180 degrees in the circumference of the tip side of the optical fiber.
- the light emitting portions may also be formed discretely in the circumference of the tip side of the optical fiber, and their total area may be 30% or more of the total area of the outer circumferential surface of the tip part of the optical fiber.
- the area of the light emitting portion on the outer surface of the tip of the optical fiber can be calculated by observing multiple cross sections of the cut optical fiber using a SEM (scanning electron microscope) or similar, calculating the ratio of the total length of the area where the cladding has been removed to the total circumference, and averaging these.
- the optical fiber 20 is cut in the region 20b in multiple places (e.g., three places) and the cross sections are observed with an SEM.
- the proportion of the region of the thin cladding 22 that forms the uneven surface 22f to the total perimeter is then calculated. In the cross section of Figure 15, it is 50%.
- the area of the light emitting portion on the outer periphery of the tip of the optical fiber is calculated by averaging the values obtained for the multiple cross sections.
- unevenness refers to the difference Rz between the maximum peak of the unevenness and the minimum valley bottom (maximum height of the contour curve: see JIS B0601).
- Example 1 a medical catheter set 30 and a light source 10 shown in Fig. 15 including a light diffusion device 1 similar to those of the first embodiment shown in Figs. 1 to 7 were prepared.
- the specific specifications and conditions of Example 1 are as follows. Note that specifications and conditions not described below are as described in the description of the first embodiment above.
- Length of the light emitting portion 20b in the direction of the axis 21A 5 mm
- Method for removing cladding 22 Etching for 5 seconds
- Example 1 In addition, from the configuration of Example 1 above, except that the tip 20TE of the optical fiber 20 is not cut at an angle, and an end face is not provided at an angle with respect to the plane P perpendicular to the axis 21A of the core 21, a device with the same specifications and conditions as Example 1 was prepared, and this was used as the light diffusion device of Comparative Example 1.
- Example 2 Separately from the configuration of Example 1 above, a device with the same specifications and conditions as Example 1 was prepared, except that etching was not performed to remove the cladding 22, and no light emitting portion 20b was provided, and this was used as the light diffusion device of Comparative Example 2 (an end face was provided that was oblique to the plane P perpendicular to the axis 21A of the core 21).
- the light source 10 was operated under the above specifications and conditions to cause light to enter from the base end 20BE of the optical fiber 20 and exit (irradiate) from the light exit portion 20b (the portion corresponding to 20b in Comparative Example 2; the same applies below).
- a light receiving diameter of 3 mm (S151C, manufactured by Thorlabs) was placed at a position 1 mm away from the side of the light exit portion 20b in a specific direction perpendicular to the axis 21A (lateral component measurement) and at a position 1 mm away from the tip end 20TE of the optical fiber 20 in a direction perpendicular to the axis 21A (direct component measurement) to measure the amount of light.
- the lateral component measurement was performed at two locations, and the average was taken as the measured value. The results are shown in Table 1 below.
- Comparative Example 1 which does not have an oblique end face, very little lateral light component was detected, and in Comparative Example 2, in which the cladding 22 was not thinned, some lateral light component was detected, but it was significantly smaller than in Example 1.
- Example 1 combines the configurations of Comparative Examples 1 and 2, but it does not merely achieve the effect of combining the configurations of Comparative Examples 1 and 2; it also achieves a significantly higher lateral illumination efficiency.
- Light diffusion device 10 light source, 20 optical fiber, 20a optical transmission unit, 20b light emitting portion, 20e, 20e1, 20e2, 20e3 end face, 20BE base end, 20TE tip, 21 cores, 22, 22a, 22b clad, 22f uneven surface, 26 catheter, 30 Medical catheter set
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Abstract
Description
基端部から入射した光を先端部に向かって伝送する光伝送部と、先端側における前記クラッドの外周側に位置する部分を除去した光出射部と、を有し、
前記光出射部における前記クラッドの外径Dbが、前記光伝送部における前記クラッドの外径Daよりも、前記光伝送部を伝送される光の波長λの大きさ以上に小さく(Db≦Da-λ) 、かつ、
前記光ファイバの先端側の端部に、前記コアの軸に垂直の平面に対して斜めの端面を有する。
図1は第1の実施形態にかかる光拡散装置1の概略図であり、図2は光拡散装置1における光ファイバの光出射部及びその近傍の要部断面図であり、図3は光拡散装置1における光ファイバの光伝送部の部位の横断面図であり、図4は光拡散装置1における光ファイバの光出射部の部位の横断面図であり、図5は光拡散装置1における光ファイバの光出射部の要部における横拡大断面図である。なお、光ファイバの基端側を矢印B、先端側を矢印Tで示す。
図8は第2の実施形態にかかる光拡散装置2における光ファイバの光出射部及びその近傍の要部断面図であり、図9は光拡散装置2における光ファイバの光出射部及びその近傍の拡大断面図であり、図10は光拡散装置2における光ファイバの先端側から見た平面図(図8及び図9の紙面における右側方から見た図)である。本実施形態にかかる光拡散装置2は、第1の実施形態にかかる光拡散装置1とほぼ同様の構成であるため、光拡散装置2の概略については、図1を参照のこと。
図11は第3の実施形態にかかる光拡散装置3における光ファイバの光出射部及びその近傍の要部断面図であり、図12は光拡散装置3における光ファイバの光出射部及びその近傍の拡大断面図であり、図13は光拡散装置3における光ファイバの光出射部及びその近傍の斜視図である。本実施形態にかかる光拡散装置3は、第1の実施形態にかかる光拡散装置1とほぼ同様の構成であるため、光拡散装置3の概略については、図1を参照のこと。
以上説明した実施形態にかかる光拡散装置は、そのまま、あるいは適宜他の装備品等と共に体内に挿入して、患部等にレーザ光を照射するディフューザとして用いることができる。
実施例1として、図1~図7に示す第1の実施形態と同様の光拡散装置1を含む図15に示す医療用カテーテルセット30及び光源10を用意した。実施例1の具体的な仕様及び条件は、以下の通りである。なお、以下に記載のない仕様及び条件は、既述の第1の実施形態の説明の中で記した通りである。
・光出射部20bの軸21A方向長さ:5mm
・光出射部20bにおいて、クラッド22bの厚さtが1μm以上である面積割合:30%
・クラッド22の除去方法:エッチング5秒
・成す角θ:60°
・カテーテル26の軸21A方向長さ:2000mm
・カテーテル26の材質、内径、外径:ナイロン製(透明)、1mm、1.1mm
・光ファイバ20の全長:2000mm
・光源10の光の波長:630nm
・光源10の光の強度:1.0~500mW
10 光源、
20 光ファイバ、
20a 光伝送部、
20b 光出射部、
20e,20e1,20e2,20e3 端面、
20BE 基端部、
20TE 先端部、
21 コア、
22,22a,22b クラッド、
22f 凹凸面、
26 カテーテル、
30 医療用カテーテルセット
Claims (10)
- 径方向の中心側に位置するコアと、前記コアの外周側に位置するクラッドと、からなる光ファイバを備え、前記光ファイバの基端部から入射した光を、前記光ファイバの先端側から出射させる光拡散装置であって、
基端部から入射した光を先端部に向かって伝送する光伝送部と、先端側における前記クラッドの外周側に位置する部分を除去した光出射部と、を有し、
前記光出射部における前記クラッドの外径Dbが、前記光伝送部における前記クラッドの外径Daよりも、前記光伝送部を伝送される光の波長λの大きさ以上に小さく(Db≦Da-λ)、かつ、
前記光ファイバの先端側の端部に、前記コアの軸に垂直の平面に対して斜めの端面を有する、光拡散装置。 - 前記光出射部における前記クラッドの厚さが、前記光出射部の全面積における30%以上の領域で1μm以上である、請求項1に記載の光拡散装置。
- 前記光出射部が、前記光ファイバの先端側において、前記端面に連なる領域まで延びている、請求項1に記載の光拡散装置。
- 前記光ファイバの先端側の端部に、前記コアの軸に垂直の平面に対して斜めの端面を2以上有する、請求項1に記載の光拡散装置。
- 前記端面が、前記光ファイバの周方向において連続的であり、かつ、当該端面の形状が円錐形状である、請求項1に記載の光拡散装置。
- 前記端面と前記コアの軸に垂直の平面との成す角が、前記光伝送部を伝送される光を全反射する最小角度未満である、請求項1に記載の光拡散装置。
- 前記光ファイバが樹脂製の光ファイバである、請求項1に記載の光拡散装置。
- 前記光ファイバの開口数(NA)が0.5以上である、請求項1に記載の光拡散装置。
- 前記光出射部における前記光ファイバの外表面に、凹凸が形成されている、請求項1に記載の光拡散装置。
- カテーテルと、請求項1~9の何れかに記載の光拡散装置と、を備えた、医療用カテーテルセット。
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| JPS60250322A (ja) * | 1984-05-26 | 1985-12-11 | Hirosada Hashimoto | レ−ザ−ビ−ム側射用フアイバ |
| US5537499A (en) * | 1994-08-18 | 1996-07-16 | Laser Peripherals, Inc. | Side-firing laser optical fiber probe and method of making same |
| US5772657A (en) * | 1995-04-24 | 1998-06-30 | Coherent, Inc. | Side firing fiber optic laser probe |
| JP2001502438A (ja) * | 1996-09-16 | 2001-02-20 | フォーカル・インコーポレーテッド | 光ファイバの光散乱体及びその製造方法 |
| JP2006014776A (ja) * | 2004-06-30 | 2006-01-19 | Manii Kk | 光ファイバーの加工方法及びレーザ光照射装置 |
| US20110166562A1 (en) * | 2010-01-04 | 2011-07-07 | Ceramoptec Industries, Inc. | High Durability Side Fire Optical Fiber for High Power Applications |
| US20120099112A1 (en) * | 2010-10-25 | 2012-04-26 | Gerard Argant Alphonse | Multi-core low reflection lateral output fiber probe |
| WO2023100737A1 (ja) * | 2021-12-02 | 2023-06-08 | 古河電気工業株式会社 | 光拡散装置 |
-
2024
- 2024-03-04 JP JP2025505320A patent/JPWO2024185731A1/ja active Pending
- 2024-03-04 CN CN202480016530.7A patent/CN120813873A/zh active Pending
- 2024-03-04 WO PCT/JP2024/007982 patent/WO2024185731A1/ja active Pending
- 2024-03-04 DE DE112024001096.2T patent/DE112024001096T5/de active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60250322A (ja) * | 1984-05-26 | 1985-12-11 | Hirosada Hashimoto | レ−ザ−ビ−ム側射用フアイバ |
| US5537499A (en) * | 1994-08-18 | 1996-07-16 | Laser Peripherals, Inc. | Side-firing laser optical fiber probe and method of making same |
| US5772657A (en) * | 1995-04-24 | 1998-06-30 | Coherent, Inc. | Side firing fiber optic laser probe |
| JP2001502438A (ja) * | 1996-09-16 | 2001-02-20 | フォーカル・インコーポレーテッド | 光ファイバの光散乱体及びその製造方法 |
| JP2006014776A (ja) * | 2004-06-30 | 2006-01-19 | Manii Kk | 光ファイバーの加工方法及びレーザ光照射装置 |
| US20110166562A1 (en) * | 2010-01-04 | 2011-07-07 | Ceramoptec Industries, Inc. | High Durability Side Fire Optical Fiber for High Power Applications |
| US20120099112A1 (en) * | 2010-10-25 | 2012-04-26 | Gerard Argant Alphonse | Multi-core low reflection lateral output fiber probe |
| WO2023100737A1 (ja) * | 2021-12-02 | 2023-06-08 | 古河電気工業株式会社 | 光拡散装置 |
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| DE112024001096T5 (de) | 2025-12-18 |
| CN120813873A (zh) | 2025-10-17 |
| JPWO2024185731A1 (ja) | 2024-09-12 |
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