JP3727936B2 - Endoscopic treatment tool - Google Patents

Description

  The present invention relates to an endoscopic treatment instrument in which a needle member housed in a distal end portion of a catheter is operated to protrude and retract outside the catheter.

  Patent Document 1 discloses an endoscope treatment tool in which a hollow needle member housed in a distal end portion of a catheter is operated to protrude and retract outside the catheter. This endoscopic treatment tool is used when a needle member is punctured at a lesion site in the body and cells or tissues are collected.

  FIG. 11A shows a conventional endoscope treatment tool a. The endoscope treatment tool a is provided with an elongated catheter b. The proximal end portion of the catheter b is connected to a hand side operation portion c. A hollow needle member d is accommodated at the distal end portion of the catheter b. A distal end portion of the operation wire e inserted through the catheter b is fixed to the proximal end portion of the needle member d. The proximal end portion of the operation wire e extends toward the operation portion c on the hand side and is connected to the operation knob f.

  Further, a short tubular seal receiving member g is fixed to the proximal side of the needle member d. The seal receiving member g is formed with a side hole (peripheral surface opening) h communicating with the pipe of the needle member d. Further, on the outer peripheral surface of the needle member d, a ring-shaped rotary seal member i made of an elastic body is provided at the tip of the seal receiving member g.

  Further, a tubular protective hub j is attached to the distal end portion of the catheter b. A small-diameter portion j1 whose outer diameter is smaller than the inner diameter of the catheter b is formed at the proximal end portion of the protective hub j. The small diameter portion j1 is fixed in a state of being inserted into the catheter b.

  The operation portion c is provided with a tubular operation portion main body c1 communicating with the inside of the tube of the catheter b, and a suction port c2 protruding from the operation portion main body c1. A syringe or the like is connected to the suction port c2.

  When the endoscope treatment tool a is used, the operation wire e is moved in the axial direction in accordance with the push / pull operation of the operation knob f of the operation unit c on the hand side, and the needle member d is operated via the operation wire e. Is pushed and retracted from the distal end of the catheter b. Here, by moving the operation knob f in the forward direction (the direction of arrow F in FIG. 11A), the needle member d moves in the direction of the arrow w in FIG. 11A, and FIG. As shown in FIG. 2, the distal end of the needle member d is moved from the distal end of the catheter b to a projecting position. At this time, the rotary seal member i is pushed forward by the seal receiving member g and comes into contact with the proximal end portion of the small-diameter portion j1 of the protective hub j, whereby the rotary seal member i is compressed in the axial direction and expanded in the radial direction. In this state, the rotary seal member i is elastically deformed. Thus, the rotary seal member i is pressed against the outer peripheral surface of the needle member d and the inner peripheral surface of the catheter b, and the clearance between the outer peripheral surface of the needle member d and the inner peripheral surface of the catheter b is sealed. As a result, a fluid flow path is formed from the suction port c2 of the operation unit c through the operation unit main body c1, through the side hole h of the needle member d to the tip of the needle member d. It has become.

Further, when the operation knob f is moved backward (in the direction of arrow R in FIG. 11A) at the protruding position in FIG. 11B, the needle member d is moved into the catheter as shown in FIG. 11A. It is retracted to the retracted position housed in b.
US Pat. No. 4,791,937

  In the conventional endoscope treatment tool a, as shown in FIG. 11A, when the needle member d is in the retracted position, the distal end of the needle member d is located in the protective hub j. The length of the distal end hard portion k of the treatment instrument a is increased by adding the length of the protective hub j to the length L1 of the needle member d, so that the entire length of the hard portion k becomes L2. Therefore, there is a possibility that it cannot be inserted when inserted into the endoscope, or that the channel of the endoscope may be damaged when inserted into the endoscope.

  Further, when the needle member d moves in the axial direction when the needle member d is retracted, the rotary seal member i also moves on the needle member d. At this time, since the contact between the inner surface of the catheter b and the rotary seal member i is not uniform, the rotary seal member i can be inclined as shown in FIG. There is sex. In this case, the seal of the fluid flow path from the inside of the catheter b through the side hole h of the needle member d to the tip of the needle member d becomes defective, and the suction function may be lowered.

  Further, as shown in FIG. 11A, when the needle member d is retracted to the retracted position accommodated in the catheter b, the position of the needle member d is not particularly fixed, and the operation knob f Is held so as to be movable in the axial direction. Therefore, there is a possibility that the needle member d moves in the axial direction and the needle member d protrudes from the distal end of the catheter b when the endoscope treatment tool a is inserted into or removed from the endoscope channel. . In such a case, there is a possibility of making a hole in the endoscope channel or scratching it.

  The present invention has been made paying attention to the above circumstances, and its purpose is to improve the usability of the endoscope by enhancing the ease of insertion of the endoscope into the channel, without reducing the suction function. Is to provide.

According to the first aspect of the present invention, a tubular needle member capable of moving back and forth in the axial direction is disposed inside the distal end of a flexible catheter, and a peripheral surface opening is formed on the proximal end side outer peripheral surface of the needle member. And a needle for moving the needle member in the axial direction between a protruding position where the tip of the needle member protrudes from the tip of the catheter and a retracted position where the needle member is drawn into the catheter. A moving means and a protruding amount regulating means for regulating the protruding amount of the needle member inside the distal end of the catheter; and the needle member is moved to the protruding position and passes through the tube of the needle member. In an endoscope treatment instrument provided with a seal member for ensuring communication between the peripheral surface opening and the internal space of the catheter, the protrusion amount regulating means is formed by a flexible protective member that protects the catheter. An internal view characterized in that at least a part of the flexible protective member is fixed inside the distal end of the catheter, and the seal member is fixed to at least one of the outer peripheral surface of the needle member and the flexible protective member. This is a mirror treatment tool.
In the first aspect of the present invention, when the needle member is pulled into the catheter by the needle moving means and held at the retracted position, the distal end of the catheter is held in a state of being easily bent together with the internal flexible protection member. . Thereby, the length of the hard part of the front-end | tip part of a catheter can be shortened conventionally, and the amount of insertion force at the time of endoscope insertion is reduced. In addition, when the seal member is fixed to at least one of the outer peripheral surface of the needle member and the flexible protective member, when the needle member is moved forward and backward in the axial direction, the seal member is a clearance portion between the needle member and the catheter. It will not get caught in. This prevents the seal member from being inclined when the needle member is moved, or prevents the seal member from being cut off, so that the seal member and the needle member are at the protruding position where the distal end portion of the needle member protrudes from the distal end of the catheter. The clearance between the needle member and the catheter is reliably blocked without being deformed and caught in the catheter clearance, and the communication between the needle member tube and the catheter can be ensured.

The invention according to claim 2 is characterized in that the flexible protection member is formed of a cylindrical elastic body, and the flexible protection member also serves as the seal member. It is a tool.
In the second aspect of the invention, when the needle member is moved from the distal end of the catheter to the projecting position where the distal end portion of the needle member is projected, the flexible protective member of the cylindrical elastic body is the proximal end portion of the needle member. Is pressed in the axial direction, and the base end portion of the flexible protective member is elastically deformed so as to reliably block the clearance between the needle member and the catheter. As a result, communication between the inside of the tube of the needle member and the inside of the catheter can be secured.

The invention according to claim 3 is the endoscope treatment tool according to claim 1, wherein the flexible protection member is formed of a coil spring member.
In the third aspect of the present invention, in a state where the needle member is pulled into the catheter by the needle moving means and held at the retracted position, the distal end portion of the catheter is easily bent together with the flexible protection member of the coil spring member inside. Held in. As a result, the length of the hard portion at the distal end of the catheter can be made shorter than before, and the amount of insertion force during insertion of the endoscope is reduced.

According to a fourth aspect of the present invention, in the endoscope treatment instrument according to the third aspect, the coil spring member has the seal member fixed at a rear end position.
In the fourth aspect of the invention, when the needle member is moved from the distal end of the catheter to the projecting position where the distal end portion of the needle member is projected, the seal member at the rear end position of the coil spring member is the proximal end of the needle member. The seal member is elastically deformed so as to reliably close the clearance between the needle member and the catheter. Thereby, the communication between the inside of the tube of the needle member and the inside of the catheter is ensured.

5. The endoscope treatment tool according to claim 1, wherein the needle member is formed with a fixing groove of the seal member at a position ahead of the peripheral surface opening. It is.
In the fifth aspect of the invention, the seal member is fixed in the fixing groove of the needle member so that the seal member does not slide on the needle member when the needle member is moved in the axial direction. Accordingly, the seal member is prevented from being inclined when the needle member is moved or the seal member is cut off, and the seal member is inserted into the needle member and the catheter at the protruding position where the distal end portion of the needle member protrudes from the distal end of the catheter. Thus, the clearance between the needle member and the catheter is surely blocked and the communication between the inside of the needle member and the inside of the catheter can be ensured.

The invention according to claim 6 is the treatment instrument for endoscope according to claim 1, wherein the needle member has a distal end side peripheral surface opening at a portion protruding from the distal end of the catheter.
In the sixth aspect of the present invention, suction is applied from the distal end opening of the needle member and the distal end circumferential surface opening in a state where the distal end of the needle member is moved from the distal end of the catheter to the protruding position. A cell or tissue is collected.

The invention according to claim 7 is the endoscope treatment instrument according to claim 1, wherein the needle moving means has a biasing means for biasing the needle member in a direction in which the needle member is pulled into the catheter. .
In the seventh aspect of the invention, when the needle member is pulled into the catheter, the needle member is urged in the direction to be pulled into the catheter by the urging means of the needle moving means, thereby reliably Is moved to the retracted position in the flexible protective member.

  ADVANTAGE OF THE INVENTION According to this invention, the treatment tool for endoscopes which can improve the usability to the channel of an endoscope, can improve the usability, without the fall of a suction function can be provided.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an endoscope treatment tool 1 according to the present embodiment. This endoscopic treatment instrument 1 is provided with a flexible and elongated catheter 2. A hollow needle member 3 is accommodated at the distal end portion of the catheter 2. The distal end portion of the operation wire 4 inserted into the catheter 2 is fixed to the proximal end portion of the needle member 3. The proximal end portion of the operation wire 4 extends toward the proximal operation portion 5 connected to the proximal end portion of the catheter 2.

  The operation unit body 6 is provided on the operation unit 5 on the hand side. As shown in FIG. 2, a hole portion 7 communicating with the lumen of the catheter 2 is formed in the axial center portion of the operation portion main body 6. Furthermore, a large-diameter hole portion 8 that communicates with the hole portion 7 is formed at the terminal portion at the base end portion of the operation portion main body 6. The large-diameter hole portion 8 is fitted with a substantially bottomed cylindrical cap-shaped spring receiving member 9. A wire insertion hole 10 through which the operation wire 4 is inserted is formed at the bottom of the spring receiving member 9.

  The proximal end portion of the operation wire 4 extends from the hole portion 7 of the operation portion main body 6 to the outside through a wire insertion hole 10 of the spring receiving member 9 to an appropriate length. An operation knob 11 is connected to a terminal portion of the extending portion of the operation wire 4. Then, a needle moving means 12 is provided that causes the needle member 3 to project and retract from the distal end of the catheter 2 by moving the operation wire 4 forward and backward in the axial direction (arrow XY direction in FIG. 1) by the operation knob 11. It has been. At this time, by moving the operation knob 11 forward (in the direction of arrow X in FIG. 1), as shown in FIG. 4, from the distal end of the catheter 2 to the projected position where the distal end of the needle member 3 is projected. The needle member 3 is moved. Furthermore, the needle member 3 is moved to the retracted position in which the needle member 3 is drawn into the catheter 2 as shown in FIG. 1 by moving the operation knob 11 back in the direction (arrow Y direction in FIG. 1). It is supposed to let you.

  In addition, a stepped shape portion 2 a having a small diameter is formed at the distal end portion of the catheter 2. Further, a flexible protective member 13 such as a close-wound coil that protects the catheter 2 is mounted inside the distal end of the catheter 2 behind the stepped shape portion 2a. Here, a ring-shaped small-diameter protective member fixing recess 14 is formed at the distal end portion of the catheter 2 behind the stepped shape portion 2a. And the front-end part of the flexible protection member 13 is being fixed in the state clamped between the stepped shape part 2a and the protection member fixing recessed part 14. As shown in FIG.

  Further, a sharp puncture portion 3 a is formed at the distal end portion of the needle member 3, which is notched along an inclined surface that obliquely intersects the axial direction of the needle member 3. A side hole (circumferential opening) 3 b is provided at the rear end of the needle member 3. Further, a cover pipe 15 is fixed to the outer peripheral surface of the rear end portion of the needle member 3. The cover pipe 15 is provided with a side hole 15 a having the same size as the side hole 3 b of the needle member 3. The cover pipe 15 is arranged in the needle member 3 so that the side hole 15a of the cover pipe 15 is located at the same position as the side hole 3b of the needle member 3.

  As shown in FIG. 3A, a ring-shaped seal fixing groove 3c is formed on the outer peripheral surface of the needle member 3 in front of the side hole 3b. A ring-shaped seal member 16 formed of an elastic body such as rubber is fitted in the seal fixing groove 3c. The outer diameter of the seal member 16 is slightly smaller than the inner diameter of the catheter 2. As shown in FIG. 4, when the needle member 3 is moved to the protruding position where the distal end portion of the needle member 3 protrudes from the distal end of the catheter 2, the seal member 16 is moved behind the flexible protective member 13 by the cover pipe 15. It comes to be pressed against the end. At this time, the seal member 16 contracts to a state in which the length in the axial direction becomes short, and elastically deforms in a state in which the radial direction expands. Therefore, the seal member 16 causes the inner peripheral surface of the catheter 2 and the outer periphery of the needle member 3 to be deformed. The clearance between the needle member 3 and the catheter 2 is ensured to communicate with each other through the side hole 3 b of the needle member 3 and the side hole 15 a of the cover pipe 15. It has become.

  Further, when the seal member 16 is brought into pressure contact with the rear end portion of the flexible protection member 13, the protruding amount of the distal end portion of the needle member 3 protruding from the distal end of the catheter 2 is regulated. Thereby, the protrusion amount regulating means 17 of the needle member 3 is formed by the contact portion between the rear end portion of the flexible protection member 13 and the seal member 16 of the needle member 3.

  A suction port 18 protrudes from the outer peripheral surface of the operation unit main body 6. The inner end portion of the suction port 18 communicates with the hole portion 7 of the operation portion main body 6. A syringe (not shown) is detachably connected to the outer end of the suction port 18. Then, suction is applied to the needle member 3 through the inside of the catheter 2 by operation of the syringe, and cells or biological tissue are collected.

  A coil spring 19 is disposed between the operation knob 11 and the spring receiving member 9 of the operation section main body 6. The coil spring 19 is disposed on the same axis as the operation wire 4. The operation knob 11 is biased in a direction away from the operation portion main body 6 by the spring force of the coil spring 19. Thereby, the needle member 3 is always urged through the operation wire 4 in the direction of the retracted position inside the catheter 2 shown in FIG.

  Further, a stopper pipe 20 that restricts the retracting position of the needle member 3 is fixed to the operation wire 4. The stopper pipe 20 is brought into contact with the peripheral portion of the wire insertion hole 10 of the spring receiving member 9 of the operation portion main body 6 as shown in FIG. The pull-in position 3 is regulated. At this time, as shown in FIG. 1, the tip of the needle member 3 is set to stop at a position in the flexible protection member 13.

  Further, the operation knob 11 is provided with a luer-shaped engagement convex portion 21 which is inserted into a cylinder of the spring receiving member 9 of the operation portion main body 6a and engages and disengages. As shown in FIG. 4, the engaging convex portion 21 is inserted into the cylinder of the spring receiving member 9 and engaged when the needle member 3 is moved to the protruding position where the needle member 3 is protruded from the catheter 2. The needle member 3 can be fixed at the protruding position.

  Next, the operation of the above configuration will be described. When the endoscope treatment tool 1 according to the present embodiment is used, first, as shown in FIG. 1, the operation knob 11 is moved backward (in the direction of arrow Y in FIG. 1) in the direction of pulling back and shown in FIG. In this way, the needle member 3 is set in a state of being moved to the retracted position where the needle member 3 is retracted into the catheter 2. In this state, the catheter 2 is inserted into a treatment instrument insertion channel of an endoscope (not shown). And the front-end | tip of the catheter 2 is protruded from the front-end | tip of the insertion part of an endoscope. When the operation knob 11 is held at the retracted position of the needle member 3, the tip of the needle member 3 is positioned in the flexible protection member 13, so that the needle member 3 is in the flexible protection member 13 when inserted into the endoscope. The needle member 3 is prevented from sticking into the catheter 2 by being removed from the inside.

  Thereafter, when the operation knob 11 is moved forward (in the direction of arrow X in FIG. 1), the needle member 3 moves forward (in the direction of arrow x in FIG. 1). Then, as shown in FIG. 4, the needle member 3 is moved from the distal end of the catheter 2 to a projecting position where the distal end portion of the needle member 3 is projected. When the needle member 3 moves forward, the seal member 16 is pressed against the rear end portion of the flexible protection member 13 by the cover pipe 15 in the vicinity of the terminal position of the protruding operation of the needle member 3. At this time, the seal member 16 contracts to a state where the length in the axial direction becomes short, and elastically deforms in a state where the radial direction expands. The seal member 16 closes and seals the clearance between the inner peripheral surface of the catheter 2 and the outer peripheral surface of the needle member 3, and passes through the side hole 3 b of the needle member 3 and the side hole 15 a of the cover pipe 15. Thus, communication between the lumen of the needle member 3 and the lumen of the catheter 2 is ensured.

  At this time, the engaging projection 21 of the operating knob 11 is simultaneously inserted into the cylinder of the spring receiving member 9 and engaged, whereby the operating knob 11 and the operating section main body 6a are locked, and the needle member 3 is in the protruding position. It is fixed with.

  In this state, the needle member 3 is then punctured at the target lesion site. Subsequently, a syringe (not shown) is connected to the suction port 18 of the operation unit main body 6, and suction is applied to the needle member 3 through the inside of the catheter 2 by operation of the syringe to collect cells or biological tissue.

  After the collection of the cells or the biological tissue, the lock of the operation knob 11 and the operation section main body 6a is released by pulling out the engaging convex portion 21 of the operation knob 11 from the spring receiving member 9 of the operation section main body 6a. In this state, the operation knob 11 is moved backward (in the direction of arrow Y in FIG. 1). Thereby, the needle member 3 is moved to the retracted position where the needle member 3 is retracted into the catheter 2 as shown in FIG. At this time, since the operation knob 11 is urged away from the operation portion main body 6 by the spring force of the coil spring 19, the tip of the needle member 3 is reliably moved to the retracted position in the flexible protection member 13. In this state, the catheter 2 is then removed from the endoscope.

  Therefore, the above configuration has the following effects. That is, in the endoscope treatment tool 1 according to the present embodiment, since the flexible protective member 13 is disposed inside the distal end of the catheter 2, the needle member 3 is pulled into the catheter 2 at the retracted position. The portion of the front flexible protection member 13 (the portion of length L3 in FIG. 1) can be held in a flexible state. Therefore, in the endoscope treatment tool 1 according to the present embodiment, the hard portion at the distal end of the catheter 2 can be limited to the length L1 portion of the needle member 3 as shown in FIG. As a result, the hard portion k is obtained by adding the length of the protective hub j to the length L1 of the needle member d as in the conventional endoscope treatment tool a (see FIGS. 11A to 11C). The length of the hard portion at the distal end of the catheter 2 can be shortened compared to the case where the entire length is L2. Thereby, since the flexible protective member 13 is elastically deformed flexibly when the catheter 2 is inserted into the treatment instrument insertion channel of the endoscope, the insertion force amount of the catheter 2 is reduced as compared with the conventional case.

  In the present embodiment, the seal fixing groove 3c is formed on the needle member 3, and the seal member 16 is fitted into the seal fixing groove 3c. Therefore, the seal member 16 can be fixed on the needle member 3. . Therefore, in this case, when the needle member 3 moves in the axial direction inside the catheter 2, the seal member 16 does not slide on the needle member 3, so that the needle member 3 is moving in the axial direction. The seal member 16 is not deformed and caught in the clearance portion between the needle member 3 and the catheter 2. As a result, the clearance between the needle member 3 and the catheter 2 is reliably blocked at the projecting position where the distal end portion of the needle member 3 is projected from the distal end of the catheter 2, and communication between the needle member 3 and the catheter 2 is ensured. I can do it.

  In addition, in the present embodiment, since the coil spring 19 is disposed between the operation knob 11 and the spring receiving member 9 of the operation portion main body 6, the needle member 3 is retracted into the catheter 2 shown in FIG. When the needle member 3 is returned to the position, the needle member 3 can be reliably returned to the retracted position by the spring force of the coil spring 19. Therefore, the distal end of the needle member 3 can be reliably positioned in the flexible protection member 13, so that there is an effect that the inside of the channel of the endoscope can be prevented from being damaged or broken.

  FIG. 5 shows a modification of the needle member 3 of the endoscope treatment tool 1 according to the first embodiment. In this modification, a needle member with a tip side hole in which a side hole 3d is formed at the tip of the needle member 3 is provided. In this modification, cells or living tissue can be collected from the distal end opening of the needle member 3 and the side hole 3d during suction from the needle member 3, and the suction function can be enhanced.

  FIGS. 6A to 6C show modifications of the seal fixing groove 3c of the seal member 16 in the needle member 3 of the endoscope treatment tool 1 according to the first embodiment. FIG. 6A shows a first modification of the seal fixing groove 3c. In this modification, two planar engaging grooves 31 are provided on the outer peripheral surface of the needle member 3.

  FIG. 6B shows a second modification of the seal fixing groove 3c. In this modification, three planar engaging grooves 31 are provided on the outer peripheral surface of the needle member 3. FIG. 6C shows a third modification of the seal fixing groove 3c. In this modification, four planar engaging grooves 31 are provided on the outer peripheral surface of the needle member 3.

  FIG. 7 shows a second embodiment of the present invention. In this embodiment, the configuration of the endoscope treatment tool 1 according to the first embodiment (see FIGS. 1 to 4) is changed as follows. The other parts have the same configuration as the endoscope treatment tool 1 of the first embodiment, and the same parts as the endoscope treatment tool 1 of the first embodiment are the same. A reference numeral is attached and description thereof is omitted here.

  That is, in the present embodiment, the loosely wound pitch portion 41 is provided on the rear side of the closely wound coil that forms the flexible protection member 13 inside the distal end of the catheter 2. Then, the loosely wound pitch portion 41 of the flexible protection member 13 moves the needle member 3 in the protruding direction as in the first embodiment, and the end surface of the flexible protection member 13 and the end surface of the cover pipe 15 of the needle member 3 Has a resilience in a direction to push the needle member 3 back backward.

  Next, the operation of the second embodiment will be described. In the present embodiment, as in the first embodiment, when the needle member 3 is moved in the protruding direction, the end surface of the flexible protection member 13 and the end surface of the cover pipe 15 of the needle member 3 come into contact with each other. Thereafter, when the needle member 3 is further moved in the protruding direction, the seal member 16 and the flexible protection member 13 are respectively compressed. At this time, when the seal member 16 expands in the radial direction, the clearance between the needle member 3 and the catheter 2 is closed and sealed, and communication between the needle member 3 and the catheter 2 is ensured.

  When the needle member 3 is moved from the protruding position shown in FIG. 4 to the retracted position where the needle member 3 is drawn into the catheter 2, the loosely wound pitch portion 41 of the compressed flexible protection member 13 is elastically restored to its original shape. The elastic restoring force to be applied can act as a biasing force that returns the needle member 3 toward the retracted position.

  Therefore, in this embodiment, since the loosely wound pitch portion 41 is provided on the rear side of the closely wound coil forming the flexible protective member 13 inside the distal end of the catheter 2, the loosely wound pitch portion 41 of the flexible protective member 13 is also a needle. The member 3 can function as an urging force in a direction to return the member 3 to the retracted position. Therefore, when the needle member 3 is returned to the retracted position direction, the tip of the needle member 3 can be surely positioned in the flexible protection member 13, so that the inside of the channel of the endoscope is damaged or damaged. There is an effect that can be prevented.

  FIG. 8 shows a modification of the endoscope treatment tool 1 according to the second embodiment. In this modification, the length of the sparsely wound pitch portion 41 of the flexible protection member 13 is set to a length at which the end surface of the flexible protection member 13 and the seal member 16 come into contact when the needle member 3 is returned to the retracted position. It is a thing. Even in this case, the same effect as the second embodiment can be obtained.

  FIGS. 9A and 9B show a third embodiment of the present invention. In the present embodiment, the configuration of the endoscope treatment tool 1 according to the second embodiment (see FIG. 7) is changed as follows.

  That is, in this embodiment, the seal member 51 is integrally connected to the base end portion of the flexible protection member 13. The inner diameter of the seal member 51 is larger than the outer diameter of the needle member 3. The flexible protection member 13 may have a shape without the loosely wound pitch portion 41 as in the first embodiment.

  In the present embodiment, when the needle member 3 is moved in the protruding direction as indicated by an arrow in FIG. 9A, the end surface of the cover pipe 15 of the needle member 3 becomes the end surface of the seal member 51 of the flexible protection member 13. Abut. Thereafter, when the needle member 3 is further moved in the protruding direction, the seal member 51 and the flexible protection member 13 are compressed as shown in FIG. 9B. At this time, the seal member 51 expands in the radial direction, so that the clearance between the needle member 3 and the catheter 2 is closed and a sealed state is secured, and communication between the needle member 3 and the catheter 2 is ensured.

  Further, when the needle member 3 is moved from the protruding position shown in FIG. 9 (B) to the retracted position drawn into the catheter 2 shown in FIG. 9 (A), the loosely wound flexible protection member 13 is compressed. The elastic restoring force that elastically returns the pitch portion 41 to its original shape can be used as an urging force that returns the needle member 3 in the direction of the retracted position.

  Therefore, in this embodiment, the same effect as in the second embodiment can be obtained. Furthermore, when the seal member 51 is integrally connected to the proximal end portion of the flexible protection member 13 as in the present embodiment, it is not necessary to provide the needle member 3 with the groove 3c for fixing the seal, and the needle member 3 There is an effect of increasing the strength of.

  FIGS. 10A and 10B show a fourth embodiment of the present invention. In this embodiment, the configuration of the endoscope treatment tool 1 according to the first embodiment (see FIGS. 1 to 4) is changed as follows. The other parts have the same configuration as the endoscope treatment tool 1 of the first embodiment, and the same parts as the endoscope treatment tool 1 of the first embodiment are the same. A reference numeral is attached and description thereof is omitted here.

  That is, instead of the flexible protective member 13 formed by the densely wound coil of the first embodiment, in this embodiment, as shown in FIG. 10A, it is formed of a cylindrical flexible body such as a rubber tube. The formed flexible protective member 61 is disposed inside the distal end of the catheter 2. The front end portion of the flexible protection member 61 is fixed in a state of being sandwiched between the stepped shape portion 2 a at the distal end portion of the catheter 2 and the protection member fixing recess 14. The inner diameter of the flexible protection member 61 is larger than the outer diameter of the needle member 3.

  Next, the operation of the above configuration will be described. In the present embodiment, as shown in FIG. 10A, the flexible protective member 61 is held in a cylindrical natural shape at the retracted position where the needle member 3 is retracted into the catheter 2. When the needle member 3 is moved forward as indicated by an arrow in FIG. 10A from this retracted position, the operation knob 11 (see FIG. 1) is pushed forward (arrow X direction in FIG. 1). Let Then, as shown in FIG. 10B, the needle member 3 is moved from the distal end of the catheter 2 to a protruding position where the distal end portion of the needle member 3 is protruded. When the needle member 3 moves forward, the cover pipe 15 is brought into contact with the rear end portion of the flexible protection member 61 during the protruding operation of the needle member 3.

  Thereafter, when the needle member 3 is further moved in the protruding direction, the flexible protective member 61 is compressed by being pressed by the cover pipe 15. Thereby, as shown in FIG. 10 (B), the flexible protective member 61 is elastically deformed in a state in which it swells in a substantially wave shape. At this time, the flexible protective member 61 expands in the radial direction, so that the clearance between the needle member 3 and the catheter 2 is closed and sealed, and the communication between the needle member 3 and the catheter 2 is ensured.

  At this time, the engaging projection 21 of the operating knob 11 is simultaneously inserted into the cylinder of the spring receiving member 9 and engaged, whereby the operating knob 11 and the operating section main body 6a are locked, and the needle member 3 is in the protruding position. It is fixed with.

  Further, by moving the operation knob 11 backward (in the direction of arrow Y in FIG. 1), the needle member 3 is brought to the retracted position where the needle member 3 is drawn into the catheter 2 as shown in FIG. 3 is moved. At this time, the flexible protective member 61 is elastically restored to a cylindrical natural shape.

  Therefore, in the above configuration, the flexible protective member 61 formed of a cylindrical soft body is disposed inside the distal end of the catheter 2, so that the needle member 3 is pulled into the catheter 2 at the retracted position. The portion of the flexible protection member 61 in front of the needle member 3 can be held in a flexible state. Therefore, in the endoscope treatment tool 1 according to the present embodiment, the hard portion at the distal end of the catheter 2 can be only the length L1 portion of the needle member 3 as shown in FIG. Similarly to the embodiment, the length of the hard portion at the distal end of the catheter 2 can be shortened. Thereby, since the flexible protection member 61 is elastically deformed flexibly when the catheter 2 is inserted into the treatment instrument insertion channel of the endoscope, the insertion force amount of the catheter 2 is reduced as compared with the conventional case.

  In this embodiment, since the flexible protective member 61 also serves as the seal member 16 of the first embodiment, the flexible protective member 13 and the seal member 16 are separated from each other as in the first embodiment. Compared with the case of forming by, the number of parts is reduced, and the cost reduction and the assembly become easy.

Furthermore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.
Next, other characteristic technical matters of the present application are appended as follows.
Record
(Additional Item 1) A flexible catheter, a needle moving means having a needle at a distal end portion capable of moving forward and backward in the axial direction inside the catheter, and a protruding amount of the needle inside the distal end of the catheter The flexible protective member that protects the restriction and the catheter has at least one part fixed to the catheter, has a side opening on the proximal end side of the needle, and the tip of the needle from the side opening position of the needle A sealing member for securing communication between the side opening and the inside of the catheter through the hollow of the needle on the side, and the sealing member is fixed to the outer periphery of the needle portion or a flexible protective member A treatment instrument for an endoscope, wherein a fixed or flexible protective member also serves as a seal member.

  (Additional Item 2) A treatment instrument for an endoscope according to Additional Item 1, wherein a side hole opening is provided on the distal end side of the needle.

  (Additional Item 3) The endoscope treatment tool according to Additional Item 1, wherein a biasing means is provided on the needle moving means so that the tip of the needle is pulled into the catheter.

  (Prior Art of Additional Items 1 to 3) As shown in FIG. 11 (A), a protective hub j is attached to the distal end of the catheter b, and a needle member movable in the axial direction is provided inside the catheter b. A needle movement control means to which d is attached is provided, the needle member d is provided with a side hole h, and a rotary seal member i is provided on the outer surface of the needle member d. As shown in FIG. 10, when the needle member d moves the operation knob f in the E direction, the needle moves in the w direction, and the rotary seal member i comes into contact with the protective hub j, thereby causing the needle member to move. The clearance between d and the catheter b is sealed, and a fluid flow path from the inside of the catheter b through the needle side hole h to the tip of the needle member d is formed.

  (Additional Items 1 to 3 to be Solved) In the conventional endoscope treatment tool, as shown in FIG. 10, when the needle is in the retracted position, the tip of the needle is located in the protective hub. Since the length of the hard portion is added to the length of the protective hub in addition to the length L of the needle, it becomes the length L1 of the hard portion and becomes long. For this reason, it could not be inserted when it was inserted into the endoscope, or the endoscope channel was damaged. Further, when the needle is moved, the needle moves in the axial direction, and the rotary seal member i also moves on the needle. However, the contact between the catheter inner surface and the rotary seal member i is not uniform, and the rotary seal member i is inclined. In some cases, the rotary seal member i was cut.

  Also, as shown in FIG. 10, when the needle control means is in the needle retracted position, the position of the needle is not fixed, and the knob is freely movable in the axial direction, so that the needle is inserted into the endoscope. At the time of removal or removal, the needle moved in the axial direction, and the needle protruded from the distal end of the catheter, thereby making a hole in the endoscope channel or scratching it.

  (Object of Additional Items 1 to 3) The present invention has been made paying attention to the above-described circumstances, and is an endoscope treatment tool for the purpose of improving insertion, insertion, and usability into an endoscope. Is to provide.

  (Means for Solving the Problem of Supplementary Item 1) The present invention provides a flexible catheter, and a needle moving means having a needle at a tip portion capable of moving forward and backward in the axial direction inside the catheter. A flexible protective member for fixing the protrusion amount of the needle and protecting the catheter is fixed to the catheter inside the distal end of the catheter, and has a side opening on the proximal end side of the needle, Providing a seal member for securing communication between the side opening and the inside of the catheter through the hollow of the needle from the position of the side opening to the distal end side of the needle; and the seal member is fixed to the needle An endoscopic treatment tool, wherein the urging means is provided so that the tip of the needle is retracted into the catheter.

  (Effects of Supplementary Item 1) According to the present invention, since the protective member at the needle retracting position is flexible, the hard portion becomes L1 as shown in FIG. Conventionally, since it has become L2, since the hard portion does not become long, the flexible protective member becomes flexible when the endoscope is inserted, so that the amount of insertion force is reduced.

  When the flexible protective member and the seal member are integrally connected, in addition to ensuring the communication between the inside of the needle and the catheter, it is not necessary to provide a groove for fixing the seal in the needle, and the strength of the needle Rise.

  When the flexible protective member also serves as the seal member, the flexible protective member and the seal member become one member, so that cost reduction and assembly are facilitated.

  (Effect of Supplementary Item 3) In addition, since the needle pulling biasing means returns to the needle pulling position, the tip of the needle is surely positioned within the flexible protective member, so that the endoscope channel may be damaged or damaged. Do not do. Further, since the flexible protective member also has a return biasing force to the needle retracting position, the tip of the needle is surely positioned in the flexible protective member, so that the inside of the endoscope channel is not damaged or damaged. In addition, when the seal member is fixed on the needle, the seal member does not slide on the needle, so that the seal member does not deform and get caught in the clearance portion of the catheter, so that the needle and the catheter are securely connected. Clearance is blocked and communication between the needle and the catheter can be secured.

  INDUSTRIAL APPLICABILITY The present invention is effective in the technical field that uses an endoscopic treatment tool in which a needle member housed in the distal end portion of a catheter is projected and retracted outside the catheter.

The side view which shows the state by which the needle member of the treatment tool for endoscopes of the 1st Embodiment of this invention was drawn in to the drawing-in part was made into a cross section. The longitudinal cross-sectional view which shows the operation part by the side of the hand of the treatment tool for endoscopes of 1st Embodiment. (A) is the longitudinal cross-sectional view of the principal part which expands and shows the IIIA part of FIG. 1, (B) is the IIIB-IIIB sectional view taken on the line of (A). The longitudinal cross-sectional view which shows the state by which the needle member of the treatment tool for endoscopes of 1st Embodiment was protruded to the protrusion position. The longitudinal cross-sectional view of the principal part which shows the modification of the needle member of the treatment tool for endoscopes of 1st Embodiment. (A) is a cross-sectional view of the main part showing a first modification of the fixing groove of the seal member in the needle member of the endoscope treatment instrument of the first embodiment, and (B) is a second fixing groove. The cross-sectional view of the principal part which shows the modification of this, (C) is the cross-sectional view of the principal part which shows the 3rd modification of a fixing groove. The longitudinal cross-sectional view of the principal part which shows the treatment tool for endoscopes of the 2nd Embodiment of this invention. The longitudinal cross-sectional view of the principal part which shows the modification of the treatment tool for endoscopes of 2nd Embodiment. FIG. 3 shows an endoscope treatment tool according to a third embodiment of the present invention, in which (A) is a longitudinal sectional view of a main part showing a state in which a needle member is pulled into a retracted position, and (B) is a needle. The longitudinal cross-sectional view of the principal part which shows the state by which the member was protruded by the protrusion position. FIG. 6 shows an endoscope treatment tool according to a fourth embodiment of the present invention, in which (A) is a longitudinal sectional view of a main part showing a state in which a needle member is pulled into a retracted position, and (B) is a needle. The longitudinal cross-sectional view of the principal part which shows the state by which the member was protruded by the protrusion position. 1 shows a conventional endoscope treatment tool, in which (A) is a longitudinal sectional view of a main part showing a state in which a needle member is pulled into a retracted position, and (B) is a needle member that is operated to protrude into a protruding position. The longitudinal cross-sectional view of the principal part which shows the state which showed, (C) is the longitudinal cross-sectional view of the principal part which shows the shift | offset | difference state in which the rotation seal member became diagonal.

Explanation of symbols

    2 ... catheter, 3 ... needle member, 13 ... flexible protection member, 16 ... seal member, 17 ... protrusion amount regulating means.

Claims (7)

A tubular needle member capable of moving back and forth in the axial direction is disposed inside the distal end of the catheter having flexibility, and a peripheral surface opening is formed on the outer peripheral surface of the proximal end of the needle member,
Needle moving means for moving the needle member in the axial direction between a protruding position where the distal end portion of the needle member protrudes from the distal end of the catheter and a retracted position where the needle member is pulled into the catheter. Provided,
And a protrusion amount restricting means for restricting the protrusion amount of the needle member inside the distal end of the catheter, and the peripheral surface opening through the tube of the needle member in a state where the needle member is moved to the protruding position. In an endoscope treatment tool provided with a seal member for ensuring communication with the internal space of the catheter,
The protruding amount regulating means is formed by a flexible protective member that protects the catheter, and at least a part of the flexible protective member is fixed inside the distal end of the catheter,
An endoscope treatment instrument, wherein the seal member is fixed to at least one of an outer peripheral surface of the needle member and the flexible protective member. The endoscopic treatment tool according to claim 1, wherein the flexible protection member is formed of a cylindrical elastic body, and the flexible protection member also serves as the seal member. The endoscope treatment instrument according to claim 1, wherein the flexible protection member is formed of a coil spring member. The treatment instrument for an endoscope according to claim 3, wherein the seal member is fixed to a rear end position of the coil spring member. The endoscope treatment instrument according to claim 1, wherein the needle member has a fixing groove for the seal member formed at a position ahead of the peripheral opening. The treatment instrument for an endoscope according to claim 1, wherein the needle member has a distal end side peripheral surface opening at a portion protruding from the distal end of the catheter. The endoscope treatment tool according to claim 1, wherein the needle moving means includes a biasing means that biases the needle member in a direction in which the needle member is pulled into the catheter.

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