WO2009113221A1 - Medical tool - Google Patents

Abstract

Disclosed is a medical tool for enabling either only one operator or two persons of an operator and an assistant to perform a ligation in a living body efficiently and safely. In a case body, there are accommodated a let-off mechanism (60) for feeding the suture thread, which has been inserted into the inside from the base end of an suture thread inserting puncture needle (20), sequentially in the direction to the leading end, and a protruding mechanism (70) for protruding an annular member (42) of a stylet (40), which has been accommodated in a suture thread gripping puncture needle (30), from the leading end of the suture gripping puncture needle (30). In the let-off mechanism (60), a suture thread feeding roller (63) rotates accompanying the rotating operation of an operation roller (64), thereby to feed the suture thread pinched between the suture thread feeding roller (63) and an auxiliary roller (62), sequentially in the direction to the leading end of the suture thread inserting puncture needle (20). The suture thread feeding roller (63) is made, in at least its outer circumferential portion, of an elastic material for contacting the suture thread elastically.

Description

Medical instruments

The present invention relates to a medical instrument used when a catheter is inserted into the abdominal viscera percutaneously. In particular, it is used to fix the anterior abdominal wall and visceral wall to facilitate the insertion of a catheter during endoscopic gastrostomy for the purpose of supplementing nutrients and discharging body fluids. It is related with the medical device to be.

Conventionally, open gastrostomy has been performed for patients who need long-term nutritional administration. However, since general gastrostomy involves excessive surgical invasion, it is often impossible to perform surgery depending on the patient's condition. Therefore, recently, gastrostomy with reduced surgical invasion as much as possible has been considered, and various medical instruments used for this purpose have been proposed.

For example, the inventor of the present invention provides a suture insertion puncture needle, a suture grasping puncture needle provided substantially in parallel with a predetermined distance from the suture insertion puncture needle, and the suture grasping puncture needle. There has already been proposed a medical instrument comprising a stylet that is slidably inserted therein, and a fixing member to which the proximal end of the suture insertion puncture needle and the suture grasping puncture needle are fixed. (For example, see Japanese Patent Publication No. 6-24533.)

However, even in the above-described conventional invention, in general gastrostomy, in addition to one operator and one endoscope operator, one assistant for operating the medical instrument Therefore, it was difficult to perform gastrostomy in a facility without an endoscope operator. Labor costs also increased. Therefore, with regard to the above-mentioned medical instruments, there is a demand for reducing the number of personnel associated with facilitating gastrostomy in facilities where there is no endoscope operator by improving usability by further simplifying operations. It was.

In view of the problems of the conventional invention as described above, the present inventor further disclosed an operation for sequentially feeding the sutures inserted into the suture insertion needle into the distal direction according to Japanese Patent Laid-Open No. 2007-319169, and suturing. By allowing the single-handed operation to be easily performed with one hand, the stylet annular member housed inside the suture grasping needle can be protruded from or inserted into the tip. We have already proposed medical instruments that can be operated.

However, even in the case of the already proposed medical device, in actual gastrostomy, for example, there is a possibility that the operation of sending out the suture is somewhat difficult, the suture is caught in the middle of sending out, or the suture is damaged. Sometimes occurred. Accordingly, it has been desired to completely eliminate these concerns and to further improve handling and operability.

The present invention has been made paying attention to the above-described problems of the prior art, and an operation for sequentially feeding the sutures inserted into the suture insertion needle into the distal direction, and a suture grasping The operation of projecting or immersing the stylet annular member housed inside the puncture needle can be easily performed with one hand, and the suture can be sent out more easily and smoothly. An object of the present invention is to provide a medical instrument capable of performing a surgical operation efficiently and safely without the possibility of the suture thread being caught or damaged in the middle.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] A puncture needle for inserting a suture thread, a puncture needle for gripping a suture thread provided approximately parallel to a predetermined distance from the puncture needle for inserting a suture thread, and sliding inside the puncture needle for gripping a suture thread A medical device comprising: a stylet inserted so as to be able to be inserted; and a case main body on which the suture insertion puncture needle and the suture grasping puncture needle are supported.
The stylet has an annular member that is formed of an elastic material and can be stored inside the puncture needle for grasping a suture at its tip,
When the annular member is protruded from the distal end of the suture grasping puncture needle, the suture thread is inserted so that the central axis of the suture insertion puncture needle or an extension line thereof penetrates the inside of the annular member. It is restored and extended in the direction of the puncture needle for
A delivery mechanism that is provided on the side of the case body that supports the proximal end of the suture insertion puncture needle, and that sequentially feeds the sutures inserted from the proximal end of the suture insertion puncture needle in the distal direction. And an annular member of the stylet provided on the side supporting the proximal end of the suture grasping puncture needle and housed inside the suture grasping puncture needle from the distal end of the suture grasping puncture needle And the protruding mechanism to be stored,
The delivery mechanism includes a guide hole communicating with a proximal end of the suture insertion puncture needle and a state in which the delivery mechanism is pressed from both sides into the middle of the suture guided through the guide hole to the inside of the suture insertion puncture needle. A pair of auxiliary rollers and a yarn feed roller that are rotatably arranged, and an operation roller that is rotatably engaged with the yarn feed roller and arranged to be rotatable from the outside. A medical instrument characterized in that the suture is delivered in the same direction as the direction in which the roller is rotated with a finger.

[2] The pair of auxiliary rollers and the yarn feeding roller, and the operation roller,
The thread feeding roller rotates in accordance with the rotation operation of the operation roller, and the suture thread sandwiched between the auxiliary roller is sequentially sent out toward the distal end of the suture insertion puncture needle,
[1] The medical instrument according to [1], wherein at least a part of an outer peripheral portion of at least one of the auxiliary roller, the yarn feeding roller, and the operation roller is formed of an elastic material.

[3] The medical use according to [1] or [2], wherein a surface of at least one of the auxiliary roller, the yarn feed roller, and the operation roller is subjected to anti-slip processing. Instruments.

[4] A needle base member that supports the proximal ends of the suture insertion puncture needle and the suture grasping puncture needle is provided at the distal end of the case body,
The needle base member is provided so as to be movable by a predetermined distance in the axial direction of each puncture needle with respect to the tip of the case body, and has a holding member for fixing the needle base member at a desired position,
The relative position between the distal end of the suture grasping puncture needle and the distal end of the annular member of the stylet accommodated in the suture grasping puncture needle is adjusted by moving or fixing the needle base member. The medical device according to [1], [2] or [3], which is made possible.

[5] The case body constitutes a housing for unitizing the entire apparatus,
The medical device according to [1], [2], [3], or [4], wherein the case body is formed of a transparent material so that the inside can be seen through.

The present invention operates as follows.
According to the medical instrument described in [1] above, when ligating between biological membranes that overlap vertically with the suture insertion needle and the suture grasping needle inserted into the living body, The projecting mechanism causes the annular member at the distal end of the stylet accommodated inside the suture grasping puncture needle to project from the distal end of the suture grasping puncture needle. Then, the annular member extends in the direction of the suture insertion puncture needle so that the central axis of the suture insertion puncture needle or its extension line penetrates the inside of the annular member.

Subsequently, the sending mechanism feeds the suture thread inserted from the proximal end of the suture insertion puncture needle, causes the suture thread to protrude from the distal end of the suture insertion needle, and passes the suture through the annular member. Let According to this delivery mechanism, the suture thread can be delivered in the same direction as the direction in which the operation roller is rotated by a finger. Thereafter, the stylet is pulled back and the annular member is housed inside the suture grasping needle. By this operation, the annular member is deformed so that the annular space is gradually narrowed, and the suture is gripped along with this, and the portion of the suture finally gripped by the annular member is sutured together with the annular member. It is housed inside the grasping puncture needle.

In this way, the operation of feeding out the suture that requires fine and careful operation and the operation of projecting or immersing the annular member from the tip can be reliably and easily performed by the delivery mechanism and the projecting mechanism, respectively. For example, when performing gastrostomy, it is possible for only one operator to perform gastric wall fixation and endoscopic operation, and only one operator, or two surgeons and assistants. The operation can be performed efficiently and safely. The suture insertion puncture needle and the suture grasping puncture needle are each supported by the case body, and since the delivery mechanism and the protruding mechanism are housed in the case body, the device is easy to handle and convenient to carry. .

Furthermore, in the delivery mechanism, specifically, as described in [2] above, the thread feeding roller rotates in accordance with the rotation operation of the operation roller, and the suture thread sandwiched between the auxiliary roller is inserted. The puncture needle can be sequentially fed toward the distal end. As described above, according to the feeding mechanism using the roller, it is possible to accurately feed an arbitrary amount as small as possible by adjusting the rotation of the operation roller, instead of sending it by a predetermined unit amount. it can.

In particular, as described above, since the suture is sent out in the same direction as the direction in which the operation roller is turned with a finger, the operation for sending out the suture can be performed intuitively and easily. Also, the auxiliary roller that makes a pair with the yarn feed roller also rotates, so that the suture can be fed out more smoothly. Furthermore, since the diameter of the operation roller is set larger than the diameter of the yarn feed roller, the suture can be sent out with a small operation amount of the operation roller.

In addition, at least a part of the outer peripheral portion of at least one of the auxiliary roller, the yarn feeding roller, and the operation roller is formed of an elastic material, for example, at least a part of the outer peripheral portion of the auxiliary roller and / or the yarn feeding roller. Are made of an elastic material, they are elastically contacted with the suture, so that the suture can be prevented from being damaged. Further, when at least a part of the outer peripheral portion of the operation roller is formed of an elastic material, it is possible to prevent the operating finger from being damaged.

Further, as in the medical instrument described in [3] above, the surface of at least one of the auxiliary roller, the thread feeding roller, and the operation roller may be subjected to anti-slip processing. As a result, it is possible to more reliably prevent the suture from being sent out or slipping of the operated finger.

Further, as in the medical instrument described in [4] above, a needle base member that supports the proximal ends of the suture insertion needle and the suture grasping needle is provided at the distal end of the case body, and the needle The base member is provided so as to be movable by a predetermined distance in the axial direction of each puncture needle with respect to the tip of the case body, and the needle base member can be fixed at a desired position by the holding member. As a result, the relative position between the distal end of the suture grasping puncture needle and the distal end of the annular member of the stylet housed inside the suture grasping puncture needle is moved or fixed by the needle base member. It can be adjusted appropriately.

If accuracy is not achieved due to tolerances and attachment processing errors of the annular member, the annular member always protrudes from the tip of the suture grasping puncture needle and deforms, or conversely, it is stored in the suture grasping puncture needle more than necessary. As mentioned above, the relative position of the annular member and the puncture needle for grasping the suture can be adjusted later, so that mass production can be performed without accurate accuracy. Is possible.

Furthermore, as in the case of the medical instrument described in [5] above, the case main body forms a housing that unitizes the entire apparatus, thereby further enhancing the convenience of handling and carrying as the apparatus. Here, the case main body is formed of a transparent material so that the inside can be seen through, so that it is possible to easily confirm the internal operation status such as the delivery of the suture.

It is a front view which shows the medical instrument which concerns on one embodiment of this invention. It is a top view which shows the medical instrument which concerns on one embodiment of this invention. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a bottom view which shows the medical instrument which concerns on one embodiment of this invention. FIG. 6 is a sectional view taken along line VI-VI in FIG. 2. FIG. 5 is a sectional view taken along line VV in FIG. 2. It is explanatory drawing which shows the inside of the gear box of the medical instrument which concerns on one embodiment of this invention. It is sectional drawing which shows the state which accommodated the gear box of the medical instrument which concerns on one embodiment of this invention in the case main body. It is sectional drawing seen from the front side which shows the state which accommodated the gear box of the medical instrument which concerns on one embodiment of this invention in the case main body. It is sectional drawing seen from the bottom face side which shows the state which accommodated the gear box of the medical instrument which concerns on one embodiment of this invention in the case main body. It is sectional drawing which shows the state in which the operating rod of the medical device which concerns on one embodiment of this invention is pushed. It is sectional drawing which shows the state which the operation rod of the medical device which concerns on one embodiment of this invention has protruded outside. It is sectional drawing which shows the inside of the gear box of the medical instrument which concerns on one embodiment of this invention. It is sectional drawing which shows the inside in another position of the gear box of the medical instrument which concerns on one embodiment of this invention. It is sectional drawing which expands and shows the front end side of the case main body of the medical instrument which concerns on one embodiment of this invention. It is explanatory drawing which shows typically the whole medical device which concerns on one embodiment of this invention. It is explanatory drawing for demonstrating the effect | action of the medical instrument which concerns on one embodiment of this invention. It is explanatory drawing for demonstrating the effect | action of the medical instrument which concerns on one embodiment of this invention. It is explanatory drawing for demonstrating the effect | action of the medical instrument which concerns on one embodiment of this invention. It is explanatory drawing for demonstrating the effect | action of the medical instrument which concerns on one embodiment of this invention. It is explanatory drawing for demonstrating the effect | action of the medical instrument which concerns on one embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments representing the present invention will be described below with reference to the drawings.
1 to 21 show an embodiment of the present invention.
The medical instrument 10 according to the present embodiment is used for fixing the anterior abdominal wall and the visceral wall, which is performed in order to facilitate insertion of a catheter during endoscopic gastrostomy.
1 is a front view of the medical instrument 10, FIG. 2 is a plan view of the medical instrument 10, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a bottom view of the medical device 10, FIG. 5 is a sectional view taken along line VI-VI in FIG. 2, and FIG. 6 is a sectional view taken along line VV in FIG.

As shown in FIG. 1, the medical instrument 10 includes a suture insertion puncture needle 20 and a suture grasping puncture needle 30 provided substantially parallel to the suture insertion puncture needle 20 at a predetermined distance. The stylet 40 (see FIG. 6) slidably inserted into the suture grasping puncture needle 30, the suture insertion puncture needle 20 and the suture grasping puncture needle 30 are supported. The case main body 11 is provided. The case main body 11 forms a housing that unitizes the entire apparatus, and is specifically formed in a rectangular parallelepiped shape extending in the longitudinal direction.

In FIG. 1, the upper surface side of the case main body 11 is a detachable lid 12, which is fixed to the case main body 11 with screws. FIG. 3 is a partial cross-sectional view with the lid 12 removed. In particular, the lid 12 of the case body 11 is made of a transparent synthetic resin, for example, a transparent material such as a vinyl chloride resin, a polyolefin such as polypropylene or polyethylene, or a polycarbonate, so that the inside can be seen through. In each figure, it is expressed for convenience as an opaque body whose inside cannot be seen through.

As shown in an enlarged view in FIG. 15 in addition to FIGS. 1 to 4, needles that support the proximal ends of the suture insertion needle 20 and the suture grasping needle 30 are provided at the distal end of the case body 11. A base member 13 is provided. The needle base member 13 is supported between the pair of support pieces 14 and 14 projecting from the tip of the case body 11 so as to be movable by a predetermined distance in the axial direction of the puncture needles 20 and 30. It is fixed at a desired position by screws 15 and nuts 16.

The locking teeth 14a, 14a,... Are connected to the inner side surfaces of the pair of support pieces 14, 14 at a fine pitch, and the same locking teeth 13a, 13a,. Are engaged and engaged with each other. Here, the position of the needle base member 13 can be adjusted by the pitch interval of the respective locking teeth 13a, 14a, and is fixed by screws 15 and nuts 16 at predetermined positions. Each pair of support pieces 14 and 14 is provided with a long groove 14b (FIG. 15A) into which a screw 15 is movably fitted.

By adjusting the position of the needle base member 13, the distal end of the suture grasping puncture needle 30 and the distal end of the annular member 42 of the stylet 40 housed inside the suture grasping puncture needle 30 as will be described later. The relative position can be adjusted. The proximal end of the suture grasping puncture needle 30 is fixed in a state where the inside of the thin tubular needle communicates with the internal space of the needle base member 13 and opens. The same applies to the proximal end of the suture insertion needle 20.

The suture insertion puncture needle 20 and the suture grasping puncture needle 30 are supported by the needle base member 13 in parallel in a state of being separated from each other by a predetermined distance. This corresponds to the length for fixing the visceral wall, and is preferably about 10 mm to 30 mm, for example. Within this range, the anterior abdominal wall and the visceral wall can be sufficiently fixed, and the resistance when puncturing the two puncture needles 20 and 30 does not become too great.

The suture insertion puncture needle 20 is a thin tubular needle into which the suture S (see FIG. 17) can be inserted. The suture insertion needle 20 is formed of metal, for example, stainless steel, and has a blade surface for puncturing the skin at the tip. Have. In the present embodiment, the distal end of the suture insertion puncture needle 20 has a blade surface cut along a plane that obliquely intersects the axis. Further, the inside of the suture insertion puncture needle 20 serves as a passage for guiding the suture in one direction from the proximal end to the distal end of the suture insertion puncture needle 20. Specifically, the suture insertion puncture needle 20 preferably has an outer diameter of about 21 G to 17 G, particularly preferably 20 to 18 G, and a length of about 70 mm to 120 mm, particularly about 80 to 100 mm. Those are preferred.

As shown in FIG. 3, in the case main body 11, on the side supporting the proximal end of the suture insertion puncture needle 20, the suture inserted inside from the proximal end of the suture insertion puncture needle 20 is inserted. A delivery mechanism 60 that sequentially feeds in the distal direction is provided. The delivery mechanism 60 is pressed from both sides into a guide hole 61 communicating with the proximal end of the suture insertion puncture needle 20 and the suture guided through the guide hole 61 into the suture insertion needle 20. A pair of auxiliary rollers 62 and a yarn feed roller 63 that are rotatably arranged in a state, and an operation roller 64 that is rotatably engaged with the yarn feed roller 63 and arranged to be rotatable from the outside. And comprising.

More specifically, the guide hole 61 is formed in the case body 11 so as to extend in the axial direction of the suture insertion puncture needle 20. As shown in FIG. 3, the proximal end side of the guide hole 61 is formed in a tapered shape that gradually increases in diameter toward the outside, so that a suture can be easily inserted. As shown in FIG. 6, the distal end side of the guide hole 61 is connected to the inside of the suture insertion needle 20 through the hollow portion of the needle base member 13.

As shown in FIG. 3, the auxiliary roller 62 and the yarn feed roller 63 are rotatably supported in a state where they are in contact with each other at a position on the proximal end side of the guide hole 61. The operation roller 64 has a diameter that is approximately twice the diameter of the yarn feed roller 63, and is in contact (engaged) with the yarn feed roller 63 so as to be rotatable relative to each other. The part is exposed to the outside through an opening provided in the side wall of the case body 11 and is pivotally supported so that it can be rotated from the outside.

That is, in the delivery mechanism 60, when the operation roller 64 is rotated with a finger, the thread feed roller 63 is rotated, and the sutures sandwiched between the auxiliary roller 62 are sequentially directed toward the distal end of the suture insertion needle 20. It is configured to send out. Further, at least the outer peripheral portion of the yarn feed roller 63 is formed of an elastic material that elastically contacts the suture, for example, silicone rubber. Of course, not only the yarn feed roller 63 that actively feeds the suture thread, but also the outer peripheral portion of the auxiliary roller 62 or the operation roller 64 that forms a pair with the yarn feed roller 63 may be formed of an elastic material. Moreover, you may form only a part of outer peripheral part with an elastic material instead of the whole outer peripheral part.

The suture grasping puncture needle 30 is a thin tubular needle that is slidably inserted into the stylet 40 and is formed of metal, for example, stainless steel, and has a blade surface for puncturing the skin at the tip. ing. The suture grasping puncture needle 30 may be the same as the suture insertion puncture needle 20 described above, or the same outer diameter. Further, in order to ensure that the annular member 42 of the stylet 40, which will be described later, extends in the direction of the suture insertion puncture needle 20, the blade surface at the tip of the suture grasping puncture needle 30 is shown in FIG. ), The opening is preferably made in the direction of the suture insertion puncture needle 20.

Similarly to the suture insertion puncture needle 20, the suture grasping puncture needle 30 is fixed in a state where the proximal end communicates with the needle base member 13 and opens. The suture grasping puncture needle 30 may be anything as long as it can puncture the skin and insert the stylet 40. Specifically, the outer diameter and the length are the same as those of the suture insertion puncture needle 20. It is preferable to adopt the above. The tip of the suture grasping puncture needle 30 facing the suture insertion puncture needle 20 is preferably chamfered so as not to break the thread.

As shown in FIG. 17, the stylet 40 is slidably inserted into the suture grasping puncture needle 30, and has a rod-like member 41 having an outer diameter smaller than the inner diameter of the suture grasping puncture needle 30; It consists of an annular member 42 fixed to the tip of the rod-like member 41. The annular member 42 is formed of an elastic material. When the annular member 42 protrudes from the distal end of the suture grasping puncture needle 30, the annular member 42 is restored to an annular shape as shown in FIGS. As shown in FIG. 17 (a), it is deformed so as to be substantially linear and can be accommodated inside the suture grasping puncture needle 30.

When the annular member 42 protrudes from the distal end of the suture grasping puncture needle 30, the center axis of the suture insertion puncture needle 20 or its extension line penetrates the inside of the annular member 42. It is formed to extend in the direction of puncture needle 20. Specifically, the annular member 42 is fixed to the tip of the rod-like member 41 at a certain angle, and when viewed from the side, the annular member 42 has a curved shape in which the tip part is a bottom part slightly from the center part. It is preferable. By forming in this way, the central axis of the suture insertion puncture needle 20 or its extension line penetrates the inside of the annular member 42 more reliably.

Furthermore, it is preferable that the distal end portion of the annular member 42 has a V-shape or a U-shape that is substantially centered on the distal end, and forms a suture grasping portion 42a with a reduced distance. By providing such a suture grasping portion 42a (see FIG. 17C), the suture protruding from the suture insertion puncture needle 20 can be more reliably grasped.

The material of the annular member 42 is stainless steel wire (for example, high-strength stainless steel for spring), piano wire (for example, piano wire with nickel plating or chrome plating), or superelastic alloy wire (for example, Ti—Ni). Alloys, Cu—Zn alloys, Cu—Zn—X alloys (X = Be, Si, Sn, Al, Ga), elastic gold wires such as Ni—Al alloys) are preferably used. As the material of the rod-like member 41, a metal (for example, stainless steel), a synthetic resin (for example, a polyolefin such as polypropylene or polyethylene, a fluorine resin such as PTFE or ETFE), or the like can be preferably used.

As shown in FIGS. 5 and 6, the stylet 40 housed in the suture grasping puncture needle 30 is provided on the side of the case body 11 that supports the proximal end of the suture grasping puncture needle 30. A projecting mechanism 70 for projecting the annular member 42 from the distal end of the suture grasping puncture needle 30 is provided. The protruding mechanism 70 includes a first rack 71 connected to the stylet 40, an output gear 73 that meshes with the first rack 71, an input gear 74 that is coaxial with the output gear 73, and a second gear that meshes with the input gear 74. A rack 72 and an operation rod 76 connected to the second rack 72 are provided.

FIG. 7 is an explanatory view showing the inside of the gear box 70a forming the protruding mechanism 70, and FIG. 8 is a cross-sectional view showing a state in which the gear box 70a is housed in the case main body 11. 9 is a cross-sectional view seen from the front side showing a state in which the gear box 70a is housed in the case body 11, and FIG. 10 is a bottom side view showing a state in which the gear box 70a is housed in the case body 11. It is sectional drawing seen from.

More specifically, as shown in FIGS. 5 and 6, the first rack 71 is connected to the base end of the bar-like member 41 of the stylet 40 so as to extend in the axial direction. It is arranged to be movable in the longitudinal direction that coincides with the axial direction. The output gear 73 is pivotally supported via a pivot 75 in a state of meshing with the first rack 71. The second rack 72 is arranged so as to be movable in a longitudinal direction parallel to the first rack 71 in a state of meshing with the input gear 74 in the case body 11.

The input gear 74 is supported coaxially with the pivot shaft 75 of the output gear 73, and is integrally connected to the output gear 73 by the pivot shaft 75. Here, the diameter of the output gear 73 is set to a value larger than the diameter of the input gear 74. In the present embodiment, specifically, the diameter of the output gear 73 is set to be twice the diameter of the input gear 74. As shown in FIGS. 7 to 10, the first rack 71, the second rack 72, the output gear 73, the input gear 74, and the like are each housed in a gear box 70a and configured as a unit.

The operating rod 76 is connected to the base end of the second rack 72 so as to extend in the longitudinal direction. The proximal end side of the operation rod 76 is arranged so as to protrude and project outside the gear box 70a and the case body 11. An operation push button 77 is provided at the base end of the operation rod 76, and an elastically deformable locking claw 78 is provided on the operation rod 76 near the push button 77. It is provided so that it can appear and disappear in the radial direction from the outer peripheral surface.

As shown in FIG. 5, a rod portion 72a extending in the longitudinal direction on the same axis extends at the tip of the second rack 72, and a coil-shaped spring member 80 is wound around the rod portion 72a. Yes. The spring member 80 attaches the operating rod 76 in the proximal direction from which the push button 77 protrudes so that the annular member 42 returns to the proximal direction in which the suture member puncture needle 30 is housed. It is intended to help. In this embodiment, the urging force of the operating rod 76 by the spring member is directly urged through the portion of the rod portion 72a integral with the second rack 72. You may comprise so that it may urge directly with a member.

11 shows a state in which the operating rod 76 is pushed, that is, although not shown in FIG. 11, the annular member 42 of the stylet 40 housed inside the suture grasping puncture needle 30 is inserted into the suture grasping puncture. 3 is a cross-sectional view of the case main body 11 showing a state in which the needle 30 protrudes from the tip of the needle 30. 12 shows a state in which the operating rod 76 protrudes outward, that is, although not shown in FIG. 12, the annular member 42 of the stylet 40 is housed inside the suture grasping needle 30. It is sectional drawing of the case main body 11 which shows the state which exists.

As shown in FIG. 11, when the operation rod 76 is pushed in the distal direction against the urging force of the spring member 80, the case body 11 is projected when the operation rod 76 can be restrained and released from the position. Locking means are provided. The protruding locking means includes the locking claw 78 provided in the middle of the operation rod 76 and a release button 79 for releasing the restrained state by the locking claw 78.

That is, when the push rod 77 shown in FIG. 12 is pushed against the urging force of the spring member 80 and the operation rod 76 is pushed in the distal direction, the locking claw 78 penetrates the middle of the operation rod 76. Pass through the insertion hole in a state of being recessed by the tip side taper. Then, when the locking claw 78 enters the case main body 11, it returns to its original protruding state, and the rear end side of the locking claw 78 is hooked on the inner edge of the insertion hole to be in a restrained state. To release the restraint, the release button 79 shown in FIG. 11 is pushed to temporarily dent the locking claw 78, and the engagement between the rear end of the locking claw 78 and the inner edge of the insertion hole of the case body 11 is released. It is configured to be able to.

FIG. 13 is a cross-sectional view showing the inside of the gear box 70a, and FIG. 14 is a cross-sectional view showing the inside of the gear box 70a at another position. As shown in FIG. 13, in the gear box 70a housed in the case main body 11, the second rack 72 is moved in the proximal direction by the urging force of the spring member 80 when the restraint by the locking means at the time of release is released. Return mitigation means is provided for reducing the return momentum by the sliding resistance brought into sliding contact with the second rack 72.

The return mitigating means includes, on the back side of the second rack 72, a convex portion 84 that protrudes over a predetermined length with respect to the reference surface 83, and a resistance claw 81 that elastically slides on the convex portion 84. Become. The convex portion 84 is set to a length corresponding to a stroke from the position where the operating rod 76 is pushed back to the original protruding initial position. The resistance claw 81 is provided on the inner wall surface of the gear box 70a so as to be elastically deformable in the protruding direction, and is disposed so as to elastically slide on the convex portion 84.

In addition, the gear box 70a housed in the case main body 11 has the second rack 72 in an initial position where the second rack 72 returns to the urging force of the spring member 80 when the restraint by the locking means is released. On the other hand, there is provided an immersion lock means that can be restrained and released when the operation rod 76 is pushed. As shown in FIG. 13, the immersive locking means includes a concave groove 86 on the back side of the second rack 72, near the claw 85 projecting from the front end side of the reference surface 83, and a tapered surface of the claw 85. And a locking claw 82 that elastically fits into the groove 86.

When the operating rod 76 returns to the original protruding initial position, the locking claw 82 overcomes the tapered surface of the claw 85 and elastically fits into the concave groove 86, so that the second rack 72 is placed at that position. Is restrained. On the other hand, when the push button 77 is pressed to push the operating rod 76 in the distal direction, the second rod 72 is released from being restrained by elastically deforming in a direction to get out of the groove 86 over the claw 85.

Furthermore, as shown in FIGS. 6 and 9, the case main body 11 has the first rack 71 at the initial position where the first rack 71 returns to the urging force of the spring member 80 when the restraint by the locking means when protruding is released. A buffering stopper 87 with which one rack 71 abuts elastically is provided. The stopper 87 is provided on the inner wall surface of the base end portion of the case main body 11 and is set so that the base end of the first rack 71 that has returned to the initial position just contacts. Specifically, the material of the stopper 87 may be a rubber sheet, for example.

Further, as shown in FIGS. 1 and 2, the medical instrument 10 includes a flat plate member 90 through which a suture insertion puncture needle 20 and a suture grasping puncture needle 30 are slidably penetrated. Yes. Providing such a flat plate member 90 prevents the distance between the suture insertion needle 20 and the suture grasping needle 30 from changing at the time of puncturing, specifically, preventing the distance between the two from increasing. can do. Moreover, if it forms so that sliding is possible, the flat member 90 will not inhibit a puncture operation at the time of puncture.

The flat member 90 may be formed of a circular or polygonal plate material (not shown) in addition to a rectangular plate material whose bottom surface is a flat surface that does not irritate the skin. Further, tips of a pair of support rods 91, 91 extending substantially parallel to the suture insertion puncture needle 20 and the suture grasping puncture needle 30 are fixed to the flat plate member 90. The end side is slidably supported in the case body 11 and supported.

Next, an operation in the case where the front abdominal wall and the visceral wall, for example, the front abdominal wall and the stomach body front wall are fixed by the medical instrument 10 according to the present embodiment will be described.
One of the surgeons inserts an endoscope into the patient's stomach, supplies air sufficiently, fills the stomach with air, and causes the stomach body front wall to adhere to the front abdominal wall. Then, another surgeon or assistant disinfects the abdominal skin, confirms the position of the stomach by transmitted light from the endoscope, and performs local anesthesia on the abdominal wall of this site.

Subsequently, as shown in FIG. 1, the annular member 42 of the stylet 40 is housed inside the suture grasping puncture needle 30, and inside the suture insertion puncture needle 20 from its tip, A medical instrument 10 inserted in a state where the end portion of the suture thread does not protrude is prepared, and the operator punctures the abdominal wall 100 as shown in FIG. From the front wall 110, the suture insertion needle 20 and the suture grasping needle 30 are projected into the stomach.

After confirming this state by the surgeon or assistant, as shown in FIG. 17B, the surgeon uses the protruding mechanism 70 to attach the tip of the stylet 40 accommodated inside the suture grasping needle 30. A certain annular member 42 is projected from the distal end of the suture grasping puncture needle 30. Then, the annular member 42 is restored, and the central axis of the suture insertion puncture needle 20 or its extension extends in the direction of the suture insertion puncture needle 20 so as to penetrate the inside of the annular member 42.

In FIG. 5, the operation of the projecting mechanism 70 is performed by pressing the push button 77 with a finger and pushing the operating rod 76 in the distal direction against the urging force of the spring member 80. The rack 72 also moves in the distal direction, whereby the input gear 74 meshing with the second rack 72 rotates and the coaxial output gear 73 also rotates. Then, the first rack 71 engaged with the output gear 73 also moves in the distal direction, the stylet 40 connected to the first rack 71 is pushed out in the distal direction, and the annular member 42 punctures the suture thread. It protrudes from the tip of the needle 30.

Since the diameter of the output gear 73 is set to a larger value than the diameter of the input gear 74, the annular member 42 can be projected with a longer stroke than the pushing stroke of the operating rod 76. In the present embodiment, specifically, since the diameter of the output gear 73 is set to be twice the diameter of the input gear 74, the annular member 42 is projected by a stroke twice the pushing stroke of the operating rod 76. Can do.

When the operating rod 76 is pushed against the urging force of the spring member 80, the annular member 42 protrudes from the distal end of the suture grasping puncture needle 30, and the operating rod 76 is brought to the position by the locking means when protruding. Be bound. That is, when the operating rod 76 is pushed in the distal direction, the locking claw 78 in FIG. 12 passes through the insertion hole of the case body 11 through which the middle of the operating rod 76 penetrates while being recessed by the distal end side taper. When entering the main body 11, the original protruding state is restored, and the rear end side of the locking claw 78 is hooked on the inner edge of the insertion hole to be in a restrained state. Thereby, the annular member 42 is maintained in a state of extending in the direction of the suture insertion puncture needle 20 as it is.

In FIG. 3, the suture thread inserted into the case main body 11 passes through the guide hole 61 and is inserted into the inside from the proximal end of the suture thread insertion puncture needle 20. The surgeon sequentially feeds the sutures further toward the distal end of the suture insertion puncture needle 20 by the delivery mechanism 60, protrudes from the distal end of the suture insertion puncture needle 20, and passes the suture through the annular member 42. Let The operation of the delivery mechanism 60 may be performed by rotating the operation roller 64 in FIG. 3 so as to roll it in the direction in which the suture is delivered by a finger. As the operation roller 64 is rotated, the thread feeding roller 63 rotates, and the suture thread sandwiched between the auxiliary roller 62 can be sequentially sent out toward the distal end of the suture insertion needle 20.

As described above, according to the feeding mechanism 60 using the roller, it is possible to accurately feed an arbitrary amount as small as possible by adjusting the rotation of the operation roller 64 instead of sending the unit by a predetermined unit amount. be able to. In particular, since the suture is sent out in the same direction as the direction in which the operation roller 64 is rotated with a finger, the suture delivery operation can be performed intuitively and easily. Further, by rotating the auxiliary roller 62 that is paired with the yarn feeding roller 63, the suture can be fed more smoothly.

Moreover, since at least the outer peripheral portion of the yarn feed roller 63 is formed of an elastic material that elastically contacts the suture, it is possible to prevent the suture from being damaged. Of course, not only the yarn feeding roller 63 that actively feeds the suture thread, but also the outer peripheral portion of the auxiliary roller 62 that forms a pair with the yarn feeding roller 63 may be formed of an elastic material. Similarly, the outer peripheral portion of the operation roller 64 may be formed of an elastic material. In this case, it is possible to prevent the operated finger from being damaged. Furthermore, you may form not only the whole outer peripheral part but a part of outer peripheral part with an elastic material. In addition, since the diameter of the operation roller 64 is set larger than the diameter of the yarn feed roller 63, the suture can be sent out with a small operation amount of the operation roller 64.

As shown in FIG. 17 (b), after confirming that the suture has passed through the inside of the annular member 42, the operator releases the restraint by the locking means at the time of protrusion, and the operation rod 76 is initially protruded. Return to position. That is, in FIG. 11, when the release button 79 is pressed and the locking claw 78 is temporarily recessed, the rear end of the locking claw 78 and the inner edge of the insertion hole of the case body 11 are separated, and the operating rod 76 is moved by the spring member 80. The urging force moves to the initial position on the base end side protruding from the case main body 11. Accordingly, the annular member 42 is housed inside the suture grasping puncture needle 30.

Here, if the urging force of the spring member 80 is too strong, the operation rod 76 will return excessively, which may cause the suture thread to break. As a countermeasure against this, as shown in FIG. 13, when the restraint by the locking means at the time of protrusion is released in the case body 11, the second rack 72 is urged to return in the proximal direction by the urging force of the spring member 80. There is a return mitigation means to kill.

In the return mitigation means, the resistance claw 81 on the gear box 70 a side moves from the position where the operating rod 76 is pushed back to the original protruding initial position with respect to the convex portion 84 on the back side of the second rack 72. Slidably contact with each other. Thus, by the sliding resistance with which the resistance claw 81 slides into contact with the convex portion 84 of the second rack 72, the moment of return of the second rack 72 by the spring member 80 can be reduced, and the suture thread can be prevented from being broken. Can do.

On the other hand, if the urging force of the spring member 80 is too weak, the annular member 42 does not return to the initial position and the force for grasping the suture is weakened, and the annular member 42 that should have been stored comes out when being pulled out from the patient. There is also a fear. As a countermeasure against this, as shown in FIG. 13, when the lock is released by the locking means when protruding, the second rack 72 is restrained to the initial position where the second rack 72 returns by the urging force of the spring member 80. On the other hand, there is provided an immersion lock means that can release the restraint in accordance with the pushing operation of the operation rod 76.

In the immersive locking means, when the operating rod 76 returns to the original protruding initial position, the locking claw 82 jumps over the tapered surface of the claw 85 on the back side of the second rack 72 and repels the groove 86. Thus, the second rack 72 is restrained at this position. As a result, it is possible to prevent the annular member 42 that should have been stored from being inadvertently pulled out. Note that when the push button 77 is pressed to push the operating rod 76 in the distal direction, the locking claw 82 is elastically deformed in a direction to get over the claw 85 and disengage from the groove 86, thereby releasing the restraint of the second rack 72.

Further, as shown in FIG. 6, the first rack 71 is placed in the case body 11 at an initial position where the first rack 71 is returned by the urging force of the spring member 80 when the restraint by the locking means when protruding is released. A stopper 87 is provided for elastic contact. Thereby, the annular member 42 can be surely positioned at the initial return position, and the puncture needle tip can be shaken due to impact, and the racks 71 and 72 and the gears 73 and 74 constituting the protruding mechanism 70 can be prevented from being disengaged. Can be prevented.

By the way, as shown in FIG. 17B, when the annular member 42 is housed in the suture grasping puncture needle 30 as described above in a state where the suture thread is passed through the annular member 42, The annular space formed by the annular member 42 is gradually narrowed and closed. As a result, the suture is grasped by the annular member 42 and stored together with the annular member 42 in the suture grasping puncture needle 30. After confirming this state, the surgeon removes the medical instrument 10 from the patient. Then, as shown in FIG. 18, the distal end portion of the suture thread inserted from the suture thread insertion puncture needle 20 is exposed outside the body. As shown in FIG. 19, the exposed ends of each suture are ligated. By this ligation, the stomach body front wall 110 and the abdominal wall 100 are fixed.

Further, the medical instrument 10 is punctured again approximately parallel to a position separated by a predetermined distance, for example, about 20 to 30 mm, from the ligated portion by the suture, and the above-described operation is repeated, and the abdominal wall 100 and the stomach body using the suture. The front wall 110 is fixed. Here, the medical instrument 10 used for puncture may be the one used for puncture as described above, or may be prepared separately. As shown in FIG. 20, a puncture comprising a metal needle 121 having a blade surface at the tip and a resin tube 122 that can be broken in the axial direction through which the metal needle 121 is inserted, as shown in FIG. The instrument 120 is punctured.

Then, after removing the metal needle 121, the balloon catheter 123 is inserted into the tube 122 as shown in FIG. After the operator confirms that the distal end portion including the balloon portion of the balloon catheter 123 has reached the stomach, the balloon is inflated with distilled water or the like, and the proximal end portion of the tube 122 is pulled outward in two directions. The tube 122 is axially broken and removed from the patient. Subsequently, the balloon catheter 123 is pulled to the proximal end side, the inflated balloon part is brought into close contact with the stomach body front wall 110, and further, an appropriate fixing tool is attached to the balloon catheter 123 exposed from the skin surface and sutured. The balloon catheter 123 is fixed to the stomach body front wall 110. This completes the endoscopic gastrostomy.

In the endoscopic gastrostomy as described above, an operation for feeding a suture that requires fine and careful operation, and an operation for projecting or immersing the annular member 42 are performed by a delivery mechanism 60 and a projecting mechanism 70, respectively. Because it can be performed reliably and easily, only one operator can perform gastric wall fixation and endoscopic operation when performing gastrostomy, and only one operator, or only the operator and assistant Two people can perform gastrostomy construction efficiently and safely.

Particularly, according to the protrusion mechanism 70, the annular member 42 can be protruded easily and accurately by simply pressing the push button 77 with a finger. Further, according to the delivery mechanism 60, the suture can be fed out easily and accurately by an arbitrary amount only by turning the operation roller 64 with a finger. In addition, since the medical instrument 10 according to the present embodiment includes the flat plate member 90, the positional relationship between the suture insertion needle 20 and the suture grasping needle 30 changes during puncture, specifically, It is possible to prevent the distance between the puncture needles 20 and 30 from changing (for example, spreading).

Further, in the medical instrument 10 according to the present embodiment, the needle base member 13 that supports the proximal ends of the suture insertion puncture needle 20 and the suture grasping puncture needle 30 is provided at the distal end of the case body 11. The needle base member 13 is provided so as to be movable by a predetermined distance in the axial direction of each puncture needle 20, 30 with respect to the tip of the case body 11, and the needle base member 13 is moved by a screw 15 and a nut 16 at a desired position. I was able to fix.

As a result, the relative position between the distal end of the suture grasping puncture needle 30 and the distal end of the annular member 42 of the stylet 40 accommodated in the suture grasping puncture needle 30 is determined as the needle base member 13. It can be adjusted as appropriate by moving or fixing. In particular, the pair of support pieces 14, 14 that sandwich the needle base member 13 are provided with locking teeth 14 a, 14 a... At a fine pitch, and similarly, the locking teeth 13 a, Since 13a... Are continuously provided, a reliable and fine position can be achieved without being displaced.

If accuracy does not occur due to tolerances and attachment processing errors of the annular member 42, the annular member 42 is deformed when it always protrudes from the distal end of the suture grasping puncture needle 30, or conversely within the suture grasping puncture needle 30 more than necessary. Thread breakage is induced when it is stored in, but as described above, the relative position between the annular member 42 and the suture grasping puncture needle 30 can be adjusted later so that accurate accuracy can be obtained. It becomes possible to mass-produce without.

Furthermore, in the medical instrument 10 according to the present embodiment, the case main body 11 forms a housing that unitizes the entire apparatus, thereby further enhancing the convenience of handling and carrying as the apparatus. That is, the operator can easily operate the medical instrument 10 by holding it with one hand, and is easy to handle and carry as a device. Moreover, the case main body 11, in particular the lid 12, is formed of a transparent material so that the inside can be seen through, so that the internal operation status such as sending out the suture can be easily confirmed.

The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention. For example, in the above embodiment, the extension line of the central axis of the suture insertion puncture needle 20 is configured to penetrate the inside of the annular member 42, but the inside of the suture grasping puncture needle 30 of the annular member 42 If it does not obstruct the projecting operation and the storing operation from the center, the central axis of the suture insertion puncture needle 20, in other words, the distal end portion of the suture insertion puncture needle 20 itself is an annular space formed by the annular member 42. You may comprise so that it may penetrate directly.

Further, the surface of at least one of the auxiliary roller 62, the yarn feeding roller 63, and the operation roller 64 may be subjected to anti-slip processing. As a result, it is possible to more reliably prevent the suture from being sent out or slipping of the operated finger. Specific examples of anti-slip processing include processing the surface of the outer peripheral portion into a gear shape, pear fabric or knurling. In any case, anti-slip processing is performed by providing irregularities on the surface of the outer peripheral portion.

According to the medical instrument of the present invention, an operation for sending the suture thread inserted into the suture insertion needle into the same direction as the direction in which the operation roller is rotated by a finger, and the suture needle grasping needle By allowing the single-handed operation to easily project or immerse the annular member of the stylet housed inside from one end, only one operator can perform ligation and endoscopic operation. . In particular, the suture can be sent out more easily and smoothly, and there is no risk of the suture being caught or damaged in the middle, and the treatment can be performed efficiently and safely.

Claims (5)

A suture insertion puncture needle (20), a suture grasping puncture needle (30) provided substantially in parallel with a predetermined distance from the suture insertion puncture needle (20), and the suture grasping puncture needle A stylet (40) slidably inserted into the needle (30), a case main body (11) on which the suture insertion puncture needle (20) and the suture grasping puncture needle (30) are supported. In a medical device (10) comprising:
The stylet (40) has an annular member (42) at the tip thereof that is formed of an elastic material and can be stored in the suture grasping needle (30).
When the annular member (42) is protruded from the distal end of the suture grasping puncture needle (30), the central axis of the suture insertion puncture needle (20) or its extension line is set to the annular member (42). ) Is restored and extended in the direction of the suture insertion puncture needle (20) so as to penetrate the inside of
The case body (11) is provided on the side supporting the proximal end of the suture insertion puncture needle (20), and is inserted into the suture body insertion needle (20) from the proximal end. A delivery mechanism (60) that sequentially feeds the thread in the distal direction and a side that supports the proximal end of the suture grasping puncture needle (30) are provided and housed in the suture grasping puncture needle (30). A projecting mechanism (70) for projecting the annular member (42) of the stylet (40) from the tip of the suture grasping needle (30);
The delivery mechanism (60) includes a guide hole (61) communicating with the proximal end of the suture insertion puncture needle (20), and an inside of the suture insertion puncture needle (20) through the guide hole (61). A pair of auxiliary rollers (62) and a yarn feed roller (63), which are rotatably arranged in the state of being pressed from both sides in the middle of the suture guided by the needle, and mutually rotate with respect to the yarn feed roller (63) And an operation roller (64) arranged so as to be able to be engaged and rotated from the outside, and configured so that the suture thread is fed out in the same direction as the operation roller (64) is rotated by a finger. A medical instrument (10) characterized by the above. The pair of auxiliary rollers (62) and the yarn feeding roller (63), and the operation roller (64),
As the operation roller (64) is rotated, the thread feed roller (63) rotates, and the suture thread sandwiched between the auxiliary roller (62) and the distal direction of the suture insertion needle (20). Configured to send sequentially to
The at least part of at least any one of the auxiliary roller (62), the yarn feed roller (63), and the operation roller (64) is formed of an elastic material. Medical instrument (10). The anti-slip process is performed on the surface of at least one of the auxiliary roller (62), the yarn feed roller (63), and the operation roller (64) according to claim 1 or 2. The medical device (10) as described. A needle base member (13) that supports the proximal ends of the suture insertion puncture needle (20) and the suture grasping puncture needle (30) is provided at the distal end of the case body (11),
The needle base member (13) is provided so as to be movable by a predetermined distance in the axial direction of each puncture needle with respect to the tip of the case body (11), and the needle base member (13) is held in a desired position. Having members (15, 16),
Relative position of the distal end of the suture grasping puncture needle (30) and the distal end of the annular member (42) of the stylet (40) housed in the suture grasping puncture needle (30) The medical instrument (10) according to claim 1, 2 or 3, characterized in that it can be adjusted by moving or fixing the needle base member (13). The case body (11) constitutes a housing for unitizing the entire apparatus,
The medical instrument (10) according to claim 1, 2, 3 or 4, wherein the case body (11) is made of a transparent material so that the inside thereof can be seen through.

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