JPH0838495A - Endoscopec processing tool - Google Patents

Abstract

PURPOSE:To improve operability of an operation for peeling off a thin layer-like tissue by hardly allowing the thin layer-like tissue dropping off from an endoscope processing tool when the thin layer-like tissue or the like in a body cavity is grasped firmly and certainly and a peeling off operation of this thin layer-like tissue is performed in such a state that it is grasped by the endoscope processing tool. CONSTITUTION:This endoscopic processing tool is formed in such a manner that the length of one edge side of a pin slidingly-moving groove 20 is set longer than an operation range in which a guide pin 36 moves along the pin slidingly- moving groove 20 when an action to move a grasping member 5 to a closed position is performed, and a clearance 1 for extending toward the head direction further than the position of the guide pin 36 when the grasping member 5 is closed, is formed on this pin slidingly-moving groove 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscopic treatment tool used in endoscopic examination and endoscopic surgery.

[0002]

2. Description of the Related Art In a grasping forceps which is a treatment tool of this kind, a forceps member which is openably and closably provided at the tip of an insertion portion is conventionally opened and closed as described in JP-A-5-285147. In many cases, a link mechanism is adopted as a means for doing so.

Here, an operating portion on the hand side is connected to the proximal end portion of the insertion portion of the grasping forceps. Further, the operation shaft of the forceps member is arranged in the insertion portion so as to be able to move forward and backward. Then, the link mechanism is driven in response to the movement of the operation shaft that moves forward and backward in accordance with the operation of the operation portion, and the forceps member is opened and closed.

Recently, instead of a link mechanism having a complicated structure and a large number of parts as an opening / closing driving means for driving the forceps member to open / close, for example, German Utility Model Publication G91065.
06.2 and German utility model publication G8900376.4.
In many cases, a cam mechanism having a simple structure and a small number of parts is adopted as described in the above.

This cam mechanism is formed by combining a cam groove and a cam pin which is engaged with the cam groove and moves along the cam groove. Then, the cam mechanism is driven in response to the movement of the operation shaft that moves forward and backward in accordance with the operation of the operation portion, and the forceps member is opened and closed.

[0006]

By the way, in the grasping forceps that employs a cam mechanism as a means for opening and closing the forceps member, when the operation of closing the forceps member in the open state is performed, the operation shaft is pulled by the operation of the operation portion. It is supposed to do. Further, the cam pin moves along the cam groove along with the operation of the operation shaft, and at the same time, the forceps member is moved in the closing direction in conjunction with the operation of the cam pin. The forceps member is configured to be fully closed when the cam pin moves to a position where it abuts against the end of the cam groove.

Further, in the above-mentioned conventional structure, since the force for moving the forceps member in the closing direction is not transmitted from the cam mechanism side to the forceps member side after the time when the cam pin moves to the position where it hits the terminal end of the cam groove. , Even after the cam pin has moved to the position where it abuts the end of the cam groove, if a strong force is applied to the operating part in the direction to close the forceps, the forceps member will flex slightly, so a sufficient force beyond that is applied. There is a problem that can not be transmitted to the tip side of.

Therefore, when the above-mentioned grasping forceps are used to perform an operation of grasping and peeling off a thin film tissue such as mesentery in a body cavity between the forceps members, when the forceps members are closed in a fully closed state. After that, even if a strong force is applied to the operation portion in the direction of closing the forceps member, the force is not transmitted to the distal end side of the forceps member, so the force for grasping thin-film tissue such as mesentery between the forceps members is sufficiently strong. There is a problem that is difficult to do. As a result, since the force for grasping thin-film-like tissue such as mesentery between the forceps members is relatively small, the thin film such as the mesentery-like membrane is removed from between the forceps members when the peeling operation is performed while grasping the thin-film-like tissue. There is a problem that the textured tissue is likely to come off and the operation of peeling off the thin-filmy texture is difficult to perform.

The present invention has been made in view of the above circumstances, and an object thereof is to firmly and surely grasp a thin film tissue or the like in a body cavity, and to perform an operation of peeling off the thin film tissue in a grasped state. It is an object of the present invention to provide a treatment instrument for an endoscope in which a thin film-shaped tissue is less likely to fall off when performing, and the operability of an operation of peeling the thin film-shaped tissue can be improved.

[0010]

According to the present invention, an openable / closable treatment member is arranged at the distal end of an insertion portion to be inserted into a living body.
An operation portion on the proximal side is connected to the base end portion of the insertion portion, an operation shaft of the treatment member is disposed in the insertion portion so as to be capable of advancing and retreating, and a cam groove is engaged with the cam groove. ,
A cam mechanism in combination with a cam pin that moves along the cam groove is provided, and the cam mechanism is driven in response to the operation of the operation shaft that advances and retreats in accordance with the operation of the operation portion, and the treatment member is moved. In an endoscopic treatment instrument having an opening / closing drive means for driving to open / close, when the treatment member is moved between an open position and a closed position, the cam pin is moved to a position larger than an operation range in which the cam pin moves along the cam groove. The length of at least one end of the cam groove is set to be long.

[0011]

With the operation of moving the treatment member from the open position to the closed position, the cam pin does not reach the end position of the cam groove when the treatment member moves to the closed position.
After the time when the treatment member has moved to the closed position, when the operating force is further strongly applied to the operation portion in the direction of closing the treatment member,
The cam pin is further advanced along the cam groove so that the operation force thereof is sufficiently transmitted to the distal end portion of the treatment member so that the thin film tissue or the like in the living body can be grasped with a sufficiently strong force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. FIG. 1 shows a schematic configuration of a grasping forceps 1 which is a treatment tool for an endoscope. This grasping forceps 1
The operating portion 3 on the proximal side is connected to the proximal end portion of the insertion portion 2 inserted into the living body through a trocar outer tube (not shown).

Further, the insertion portion 2 is provided with a long shaft body 4. A treatment section 6 including a pair of gripping members 5 and 5 that can be opened and closed is disposed at the tip of the shaft body 4. Here, the shaft body 4 of the insertion portion 2 is provided with a sheath unit 7 that constitutes an outer shell portion of the insertion portion 2.

The holding members 5 and 5 are made of, for example, stainless steel (SUS420J2), and the surface thereof is, for example, a chemical vapor deposition (CUD) method in order to improve wear resistance.
Method) titanium nitride (TiN) or titanium carbide (T
A ceramic compound such as iC) is coated in a single layer or multiple layers.

Further, in the sheath unit 7, FIG.
As shown in (A) and (B), the gripping members 5 and 5 of the treatment section 6 are shown.
A treatment section drive unit 9 is integrally provided with an open / close drive mechanism (open / close drive means) 8 for opening / closing.

The main body of the grasping forceps 1 is composed of three independent assembly units including a treatment section drive unit 9, a sheath unit 7 and an operation section 3 which are separately assembled. Here, a first connecting portion 10 (see FIG. 10) described later is provided between the operating portion 3 and the sheath unit 7, and a second connecting portion 11 (described later) is provided between the sheath unit 7 and the treatment portion drive unit 9. 14 (B) (see FIG. 14B).

Further, the treatment section drive unit 9 is provided with an operating shaft 12 of an opening / closing drive mechanism 8 for driving the gripping members 5, 5 to open and close. The operation shaft 12 is arranged in the sheath unit 7 so as to be able to move back and forth. Further, on the operation shaft 12, as shown in FIGS. 3A and 3B, a rod-shaped tip side operation rod 13 arranged on the tip side, a rod-shaped hand side operation rod 14 arranged on the hand side, A cylindrical operation rod connecting member 15 is provided for connecting between the tip side operation rod 13 and the hand side operation rod 14.

Here, as shown in FIG. 5C, a screw hole 15a is formed on the inner peripheral surface of the operating rod connecting member 15. Further, the operation rod connecting member 15 is provided on the outer peripheral surface of the rear end portion of the distal end side operation rod 13 and the outer peripheral surface of the distal end portion of the proximal side operation rod 14.
Male screw portions 13a and 14a that are screwed into the screw holes 15a are formed respectively. Then, the male screw portion 13a of the distal end side operating rod 13 and the male screw portion 14 of the proximal side operating rod 14
a is screwed into each of the screw holes 15a of the operation rod connecting member 15 to integrate them.

Further, the tip end of the operation rod 13 on the tip side is shown in FIG.
As shown in (A) and (B), the W jumper member 16 is connected. A cylindrical operation rod connecting portion 17 is formed at the rear end of the W jumper member 16. A female screw portion 17 a is formed in the cylinder of the operation rod connecting portion 17. A male screw portion 13b formed on the outer peripheral surface of the tip portion of the tip side operation rod 13 is screwed to the female screw portion 17a. Note that W
The outer peripheral surface of the operating rod connecting portion 17 of the jumper member 16 is shown in FIG.
As shown in (A) and FIG. 4 (C), water passage grooves 17b are provided over the entire length of both side surfaces.

Further, a grip member connecting portion 18 having a substantially rectangular flat plate shape is provided at the tip of the W jumper member 16. As shown in FIG. 5 (B), substantially arcuate pin sliding grooves (cam grooves) 20 are formed on both surfaces of the grip member connecting portion 18.

Further, a tip cover 21 for guiding the movement of the operation shaft 12 in the axial direction is provided outside the W jumper member 16.
Is provided. 2 is attached to the tip of the tip cover 21.
Book support arms 22 and 22 are provided in a protruding manner. further,
As shown in FIG. 4D, a protruding portion 23 for positioning in the rotational direction, which is cut into a substantially semicircular cross section, is provided on the rear end side of the front end cover 21. As shown in FIG. 2 (A), a cut-off portion 24 cut off at approximately 90 ° is formed at the edge portion on the proximal side of the projecting portion 23.

Further, the portion between the gripping member connecting portion 18 and the operating rod connecting portion 17 of the W jumper member 16 is shown in FIG.
As shown in (C), planar notches 25, 25 are formed which come into contact with the two support arms 22, 22 of the tip cover 21. Here, the distance between the notches 25 on both sides is set to be equal to the distance between the two support arms 22, 22 of the tip cover 21. A rotation stopper that prevents the W-shaped member 16 from rotating about its central axis by the contact portion between the notched portions 25, 25 of the W-shaped member 16 and the two support arms 22, 22 of the tip cover 21. The part 26 is formed.

Further, each of the grasping members 5 of the treatment section 6 is provided with a grasping section 31 for grasping a living tissue on the distal end side.
The grip portion 31 is provided with forceps teeth 32 each having a substantially sawtooth shape on the joint surface with the other grip member 5. A product name, a company name, etc. are written on the back surface of the grip portion 31 of the grip member 5 by means such as laser marking.

Further, a link arm 33 is projectingly provided on the base end side of each gripping member 5. This link arm 33
As shown in FIG. 5B, an elongated hole 34 is formed in the middle part. Then, as shown in FIG. 5 (A), the caulking pin 35 serving as a rotating shaft is attached to the link arms 33 on both sides through pin insertion holes 22a provided at the tip ends of the two support arms 22, 22 of the tip cover 21. It is inserted in the long hole 34. Both ends of the caulking pin 35 are caulked and fixed to the two support arms 22 and 22, respectively.
Therefore, the both gripping members 5 of the treatment portion 6 have the tip cover 21.
The support arms 22 and 22 are rotatably supported around the crimp pin 35.

A guide pin (cam pin) 36 is provided at the tip of the link arm 33 of each grip member 5 so as to project therefrom. The guide pin 36 is slidably inserted into the pin sliding groove 20 of the W-shaped member 16. The cam mechanism K is formed by the pin sliding grooves 20 on both sides of the grip member connecting portion 18 and the guide pins 36 of each grip member 5.

When the opening / closing drive mechanism 8 of the treatment section drive unit 9 is driven, the cam mechanism K is driven by moving the operation shaft 12 in the axial direction with respect to the distal end cover 21. That is, when the W jumper member 16 moves in the axial direction together with the operation shaft 12, the guide pin 36 of the cam mechanism K moves along the pin sliding groove 20 along with the operation of the W jumper member 16. With the operation of the cam mechanism K, the link arms 33 of both gripping members 5 of the treatment section 6 are rotated around the crimping pins 35 so that the gripping section 31 of the treatment section 6 is at the same closed position as shown by the solid line in FIG. It is designed to be opened and closed between an open position shown by an imaginary line in the figure. Here, both gripping members 5 of the treatment section 6 are adapted to be opened by pushing out the operating shaft 12 and closed by being pulled.

Further, in the pin sliding groove 20 of the gripping member connecting portion 18 of the W jumper member 16, the position of the guide pin 36 at the time of closing the gripping members 5 is closer to the tip end direction than the position of the guide pin 36 shown in FIG.
As shown in (B), a clearance S ₁ having an appropriate distance is formed. Further, the gripping members 5, 5 are closed in the pin sliding groove 20, and the guide pin 36 of the link arm 33 is attached to the groove side surface 20a on the tip side of the pin sliding groove 20 as shown in FIG. 6B. When contacted, this guide pin 36
A backlash S ₂ having an appropriate distance is formed between the pin side groove 20 and the groove side surface 20b on the proximal side of the pin sliding groove 20.

Further, as shown in FIG. 6 (B), the guide pin 36 of each gripping member 5 has a W packing member 16 when the W packing member 16 is pushed toward the tip side when the gripping members 5, 5 are opened. Of the pin sliding groove 20 on the proximal side of the pin sliding groove 20 and the proximal side contact surface 36b which slides in contact with the side surface 20b of the proximal side of the pin sliding groove 20 and the pin slide when pulling the W jumper member 16 toward the proximal side when the gripping members 5 and 5 are closed. There is provided a tip side contact surface 36a that abuts and slides on the groove side surface 20a on the tip side of the moving groove 20. Here, the guide pin 3
The radius of curvature of the tip side contact surface 36a of 6 is formed to be substantially the same as the radius of curvature of the groove side surface 20a on the tip side of the pin sliding groove 20. Similarly, the radius of curvature of the proximal contact surface 36b is formed to be substantially the same as the radius of curvature of the proximal groove side surface 20b of the pin sliding groove 20.

As shown in FIG. 6A, a fillet portion is provided between the bottom portion of the guide pin 36 and the bottom surface and the side surface of the pin sliding groove 20 of the grip member connecting portion 18 of the W jumper member 16. 36a and 18a are provided to prevent cracking from this portion. Furthermore, a minimum cross-sectional area portion 83 having a smaller cross-sectional area than the other portions of the gripping member 5 is provided near the base of the guide pin 36 on the tip side of the link arm 33 of each gripping member 5.

In addition, as shown in FIG.
As shown in (D), the tip portion of the connection pipe 37 is fitted and fixed inside the substantially semicircular projecting portion 23. Here, the tip cover 21 and the connection pipe 37 are connected and fixed by means such as adhesion, soldering, brazing, and welding, but the tip cover 21 and the connection pipe 37 may be integrally formed.

Further, on the rear end side of the connection pipe 37, a snap fit portion (connection portion) 38 which is detachably connected to the sheath unit 7 is provided. As shown in FIG. 4 (E), the connection pipe 3 is attached to the snap fit portion 38.
Four slits 39 are inserted in the rear end portion of 7 to form four cantilevered snap fit arms (arm portions) 40. Here, the connection pipe 37 is usually made of stainless steel, but stainless steel SUS420J2 may be used to improve wear resistance. Further, a projection (engagement projection) 41 is provided on the outer peripheral surface of the tip end portion of each snap fit arm 40 of the snap fit portion 38.
A taper-shaped tip side slope 41a is formed on the tip end side of the protrusion 41, and a taper-side slope 41b is formed on the tip end side of the protrusion 41 on the rear end side.

Further, the operation rod 12 on the tip side of the operation shaft 12
The rear end portion of 3 is a snap-fit portion 38 of the front end cover 21.
It is projected to the hand side from the snap fit part 38
It is screwed to the operation rod connecting member 15 outside.

A large-diameter centering portion 15b is provided on the outer peripheral surface of the operating rod connecting member 15 on the rear end side. The outer diameter of the centering portion 15b is set to be substantially the same as the inner diameter of the inner pipe 42 of the sheath unit 7, which will be described later. Furthermore, this centering unit 1
As shown in FIG. 4 (F), four notch surfaces 43 for guiding running water are formed on the outer peripheral surface of 5b. Then, the treatment section drive unit 9 is assembled to the sheath unit 7, and the centering section 15b of the operation rod connecting member 15 is provided in the inner pipe 42 of the sheath unit 7 as shown in FIG. 14B.
In the inserted state, water or the like injected from an injection cock 44 described later flows between the cutout surface 43 of the centering portion 15b and the inner peripheral surface of the inner pipe 42 of the sheath unit 7. The centering portion 15b
The notch surface 43 on the outer peripheral surface may be any number as long as water or the like flows.

Further, on the outer peripheral surface of the operating rod connecting member 15, a tip narrow portion 15c having a diameter substantially the same as the inner diameter of the connecting pipe 37 is formed on the tip side of the centering portion 15b.
Then, as the grip portion 31 of the treatment portion 6 is opened / closed, the distal end small-diameter portion 15c can move in and out of the respective snap-fit arms 40 of the connection pipe 37 as the operation shaft 12 moves back and forth.

Further, a tapered taper portion 15d is formed on the tip end side end surface of the tip small diameter portion 15c of the operating rod connecting member 15. Here, a taper portion 40a corresponding to the taper portion 15d of the operation rod connecting member 15 is formed on the inner side of the proximal end surface of the projection 41 of the snap fit arm 40.

Further, a pipe cover 45 and a connecting member 46 made of resin such as polysulfone are screwed and fixed to the rear end portion of the hand side operation rod 14. here,
At the rear end portion of the connecting member 46, a ball portion 47 is detachably connected to the operating portion 3 side. Further, the connecting member 46 is connected to a small diameter portion 48 having a small diameter connected to the tip side of the sphere portion 47 and to the tip side of the small diameter portion 48 via a medium diameter portion 49 having a medium diameter. And a large diameter portion 50 are provided. The outer peripheral surface of the connecting member 46 is covered with a heat-shrinkable tube 51 made of Teflon or the like for maintaining electric insulation.

7 (A) and 7 (B) show the sheath unit 7. An insulating tube 52 is arranged on the outer peripheral surface of the sheath unit 7. Inside the insulating tube 52, an inner pipe 42 made of metal such as stainless steel is arranged.

Further, as shown in FIG. 7 (A), the rear end of the connecting pipe 53 for connecting to the treatment section drive unit 9 is joined to the tip of the inner pipe 42 by means such as brazing or laser welding. Has been done. The connection pipe 53 is usually made of stainless steel SUS303 or the like, but stainless steel SUS420J2 may be used to improve wear resistance.

The outer peripheral surface of the connecting pipe 53 is shown in FIG.
As shown in (C), a plurality of adhesive grooves 54 for accumulating the adhesive are formed. Further, a similar adhesive groove 54 is formed on the outer peripheral surface of the tip end portion of the inner pipe 42. Then, the insulating tube 52 and the connecting pipe 53 and the insulating tube 52 and the inner pipe 42 are bonded by the adhesive applied in the adhesive groove 54, respectively.

An inner protrusion 55 having a diameter smaller than the outer diameter of the snap fit arm 40 of the treatment section drive unit 9 is provided on the inner peripheral surface of the rear end of the connection pipe 53. Further, inside the connection pipe 53, the protrusion 41 of the snap-fit arm 40 that has passed over the inward protrusion 55 at the time of connection with the treatment portion drive unit 9 is housed in the portion closer to the inner protrusion 55. An accommodating portion 56 is formed.
Then, between the storage portion 56 and the inward protrusion portion 55, the protrusion portion 4 of the snap fit arm 40 of the treatment portion drive unit 9 is provided.
A step portion 57 is formed which engages with 1 in a disengageable manner. In addition, a tapered tip side slope 55a is formed on the end surface of the inner projection 55 on the tip side, and a tapered proximal slope 55b is formed on the end surface of the inner projection 55 on the rear end side. Has been done.

Further, at the tip of the connecting pipe 53, as shown in FIG.
As shown in (A) and (B), for positioning to cut the semi-circular shape so as to mesh with the semi-circular projecting portion 23 of the distal end cover 21 of the treatment section drive unit 9, and to position the treatment section drive unit 9. The projecting portion 58 is projected. A tapered portion 59, which is formed in a rounded R shape in the vicinity of the tip, is provided at the edge portion on the tip side of the protruding portion 58.

Further, as shown in FIG. 7B, a proximal side connecting portion 60 detachably connected to the operating portion 3 side at the proximal side is provided at the proximal end portion of the sheath unit 7. A rotary knob 61 and a water injection cock 44 are provided on the hand side connecting portion 60.

Here, a cylindrical body 62 is externally fitted to the base ends of the insulating tube 52 and the inner pipe 42 of the sheath unit 7. The rotary knob 61 and the water injection cock 44 are integrally provided on the outer peripheral surface of the cylindrical body 62, respectively. A rubber plug 63 is attached to the water injection cock 44 to close the water injection cock 44 so that the water injection cock 44 can be opened and closed.

Further, a snap fit portion 64 which is detachably connected to the operation portion 3 is provided at the base end portion of the proximal side connecting portion 60. The snap fit portion 64 is provided with a connection pipe 65 made of stainless steel or the like. As shown in FIG. 7B, the tip portion of the connection pipe 65 is fixed in a state where it is inserted into the cylinder of the cylinder body 62 from the base end side.

As shown in FIGS. 8 (D) and 8 (E), two slits 66 are provided at the rear end of the connecting pipe 65 to form two cantilevered snap fit arms (arms). Part)
67 is formed. Here, the snap fit part 6
A projection (engagement projection) 68 is provided on the outer peripheral surface of the tip of each snap-fit arm 67 of No. 4. This protrusion 68
Includes a first slope 68a arranged on the tip side of each snap-fit arm 67 (hand side of the sheath unit 7),
Root side of each snap fit arm 67 (sheath unit 7
And a second slope 68b disposed on the front side of the second slope 68b.

Further, at the rear end of the connecting pipe 65, at the base side of each snap fit arm 67, a large diameter portion 77 and a small diameter portion in the insertion portion connecting portion 73 of the fixed handle 70 which will be described later at the time of connection work with the operating portion 3. An abutting surface 65a that abuts on an abutting surface 77a of a step portion between the portion 78 and the step 78 is formed. Further, the connection pipe 65 of the snap fit portion 64 is provided with a ring-shaped rubber packing 69 on the outer peripheral surface in the vicinity of the connection portion with the cylindrical body 62.

In the present embodiment, the inclination angle θ ₁ of the protrusion 68 of each snap fit arm 67 with respect to the central axis of the first slope 68a is about 30 °, and the second slope 68a.
The inclination angle θ _{2 of} b is set to about 45 °, but these angles may be arbitrary angles. For example, the first slope 6
By reducing the inclination angle θ _{1 of} 8a, there is an effect that the amount of force required when inserting the snap-fit arms 67, 67 into the operation portion 3 side may be small, and conversely, the inclination angle θ of the first slope 68a is increased. Increasing ₁ has the effect of increasing the insertion force.

Further, FIG. 9A shows an operation section 3 for opening and closing the gripping members 5, 5 of the treatment section 6 arranged on the distal end side of the insertion section 2. The operating portion 3 is provided with a substantially L-shaped fixed handle 70 and a movable operating handle 71. Here, a movable operation handle 71 is rotatably connected to the L-shaped bent portion of the fixed handle 70 via a connection screw 72.

Further, a tubular insertion portion connecting portion 73 is arranged on the upper portion of the fixed handle 70. Electrode pins 74 for fitting a base of a power transmission cord from a high frequency power source (not shown) are protrudingly provided on the outer peripheral surface of the head portion of the insertion portion connecting portion 73. The lower peripheral surface of the electrode pin 74 is covered with an insulating pipe 75 made of an insulating material such as plastic.
On the outer peripheral surface of the insulating pipe 75, for example, a product name, a company name, etc. are written by means such as electrolytic marking.
A rubber cap 76 for keeping watertightness is fitted to the rear end portion of the insertion portion connecting portion 73. The rubber cap 76 is formed with an entrance / exit 76 a through which the spherical portion 47 of the treatment section drive unit 9 is inserted / extracted.

Further, a large diameter portion 77 for accommodating the rubber packing 69 of the sheath unit 7 is formed inside the insertion portion connecting portion 73, and a snap fit portion 64 is provided behind the large diameter portion 77. Is formed with a small diameter portion 78. The small-diameter portion 78 has substantially the same diameter as the outer diameter dimension of the snap-fit arms 67, 67 of the snap-fit portion 64, and is fitted together. The fixed handle 70 and the movable operation handle 71 are made of a metal material, and the outer surfaces thereof are covered with an insulating coating 79 such as fluororesin.

In the vicinity of the upper end of the movable operation handle 71, the spherical portion 4 of the connecting member 46 in the treatment portion drive unit 9 is provided.
A connection groove 80 into which 7 is inserted is formed. In the upper part of the connection groove 80, the inlet hole 8 having a diameter substantially the same as the diameter of the sphere 47 is formed.
0a is formed. Further, the ball guide hole portion 8 for guiding the ball portion 47 of the connection member 46 downward is provided in the inner portion of the connection groove 80.
0b is drilled in the vertical direction.

As shown in FIGS. 9 (B) and 9 (C), on the side opening side of the ball guide hole 80b, the diameter of the ball portion 47 of the connecting member 46 is smaller than the diameter of the ball portion 47 in the lower portion of the inlet hole 80a. A connection member guide portion 80c having a narrow width and a width wider than the medium diameter portion 49 of the connection member 46 is formed.

As described above, since the inlet hole 80a of the connection groove 80 into which the spherical portion 47 of the connecting member 46 is inserted is opened not on the upper end surface of the movable operation handle 71 but on the side surface on the distal end side, the present embodiment. When a high-frequency current is passed by using the grasping forceps 1 of FIG.
It becomes difficult to touch. Therefore, the operator's finger touches the opening on the upper end surface of the movable operation handle 71, as in the case where the entrance hole 80a is opened on the upper end surface of the movable operation handle 71 that is easily touched by the operator's fingers and the like. There is an effect that it is possible to prevent a high-frequency current from leaking from your finger and getting your finger burned. Further, since the ball sliding hole portion 80b is provided so as to penetrate to the vicinity of the connection screw 72, there is an effect that the cleaning property of the portion of the connection groove 80 is improved as compared with the conventional case.

Next, the operation of the above configuration will be described.
Here, regarding the operation of assembling the treatment tool body of the grasping forceps 1 from a state in which the operation unit 3, the sheath unit 7, and the treatment unit drive unit 9 which are the three constituent elements of the treatment instrument body of the grasping forceps 1 are disassembled. explain.

First, the operating section 3 of the grasping forceps 1 and the inserting section 2
The connecting work with the sheath unit 7 that constitutes the outer shell of the above is performed. At the time of connection work between the operation portion 3 and the sheath unit 7, the snap-fit portion 64 of the sheath unit 7 is inserted into the small diameter portion 78 from the large diameter portion 77 opened on the tip side of the insertion portion connecting portion 73 of the fixed handle 70. It here,
Snap fit arms 67 and 6 of the snap fit portion 64
The outer diameter dimension of 7 is substantially the same as the inner diameter dimension of the small diameter portion 78 so that they can fit together, and the outer diameter dimension of the protrusion 68 is larger than that of the small diameter portion 78. Therefore, the protrusion 68 of the snap fit arms 67, 67 has a small diameter portion 78.
The snap-fit arms 67, 67 are elastically deformed in a state of being bent inward.

In this way, the snap fit arms 67, 67
The sheath unit 7 is further pushed into the small-diameter portion 78 of the insertion portion connecting portion 73 of the fixed handle 70 while being bent inward. Then, when the abutting surface 65a of the rear end portion of the connecting pipe 65 in the sheath unit 7 is abutted against the abutting surface 77a between the large diameter portion 77 and the small diameter portion 78 of the insertion portion connecting portion 73 of the fixed handle 70. , The snap-fit arms 67, the projection 6 at the tip of the 67
8 extends outside the small diameter portion 78. At this time, the second slope 68 of the protrusion 68 of each snap fit arm 67
Since the slope start point of b reaches the position where it almost comes into contact with the proximal end of the small diameter portion 78, the snap fit arms 67, 67
Is opened and restored from its inwardly bent state to its original state by its elastic force.

In this way, the snap fit arms 67, 6
When 7 is opened and restored to its original state, as shown in FIG. 10, the projection 68 of each snap-fit arm 67 is removably engaged with the rear end surface of the insertion portion connection portion 73 of the fixed handle 70, The sheath unit 7 is connected to the insertion portion connecting portion 73 of the fixed handle 70 of the operation portion 3. At this time, if the projection 68 does not bend to the inner diameter of the small diameter portion 78 of the insertion portion connecting portion 73 within the range where the elastic force of the snap fitting arms 67, 67 is effective, the snap fitting portion 64 does not move. The small-diameter portion 78 does not come out.

Furthermore, when the sheath unit 7 is connected to the operating portion 3, the sheath unit 7 is supported by the operating portion 3 so as to be rotatable about its central axis. In this case, since the outer peripheral protrusion 69a of the rubber packing 69 is in close contact with the inner peripheral surface of the large diameter portion 77 of the insertion portion connecting portion 73, an appropriate resistance force is exerted against the rotation of the sheath unit 7. Has become.

When detaching the sheath unit 7 from the operating portion 3, for example, the sheath unit 7 is grasped by hand,
A pulling operation is performed by applying force in the opposite direction to the case where the sheath unit 7 is pushed into the insertion portion connecting portion 73. In this way, when a relatively large pulling operation force is applied to the sheath unit 7, the snap fit arms 67, 67 are elastically deformed in a state of being bent inward, and the snap fit arm 6
The protruding portions 68 of 7, 67 are the small diameter portions 78 of the insertion portion connecting portion 73.
Be drawn in. Therefore, each snap fit arm 6
7. Projection 68 of No. 7 and insertion part connection 73 of fixed handle 70
Since the engagement with the rear end surface of the sheath unit 7 is released,
Is pulled out from the insertion portion connecting portion 73 of the operating portion 3 and removed from the operating portion 3.

At this time, since the inclination angle θ ₂ of the second slope 68b on the base side of the projection 68 of each snap-fit arm 67 is set to 45 ° in this embodiment, the snap-fit arms 67 and 67 have the same inclination angle θ ₂ . The elastic force and thereby the second slope 6 on the base side of the protrusion 68 of each snap fit arm 67.
The sheath unit 7 can be detached from the operation unit 3 by pulling out the sheath unit 7 from the operation unit 3 with a force larger than the frictional force generated between 8b and the rear end surface of the insertion unit connection portion 73 of the fixed handle 70.

Here, it is assumed that the inclination angle θ of the second slope 68b on the base side of the protrusion 68 of each snap-fit arm 67.
_{When 2} is set to 90 ° or more, for example, the snap fit arms 67, 67 are forcibly bent inward by some method such as pinching the tips of the snap fit arms 67, 67 with fingers, and the like. It is necessary to release the engagement between the protruding portion 68 of 67 and the rear end surface of the insertion portion connecting portion 73 of the fixed handle 70.

Further, the inclination angle θ ₂ of the second slope 68b on the base side of the projection 68 of each snap-fit arm 67 is made smaller, the elastic force of the snap-fit arms 67, 67 is made smaller, or the projection is made. By reducing the diameter of 68, the force for pulling out the sheath unit 7 from the operation portion 3 can be reduced. Further, conversely, the second slope 68b on the base side of the protrusion 68 of each snap fit arm 67 is provided.
Increase the tilt angle θ ₂ of the snap fit arm 6
The force for pulling out the sheath unit 7 from the operation portion 3 can be increased by increasing the elastic force of 7, 67 or increasing the diameter of the protrusion 68.

Further, the outer diameter of the projection 68 of each snap fit arm 67 can be increased, or each snap fit arm 67 can be made larger.
When the sheath unit 7 is attached to the operation portion 3 by increasing the inclination angle θ ₁ of the first slope 68a on the tip side of the protruding portion 68 and increasing the elastic force of the snap-fit arms 67, 67. The mounting force increases, and if the opposite is true, the mounting force decreases.

Also, the projection 6 of each snap fit arm 67
8 and the inclination angle theta ₂ of the base side of the second slope 68b of, by adjusting the relationship between the inclination angle theta ₁ of the first slope 68a of the leading end side of the protrusion 68 of the snap-fit arms 67, the sheath It is possible to adjust the relationship between the amount of force for mounting the unit 7 on the operation unit 3 and the amount of force for pulling it out. That is, the inclination angle θ ₁ of the first slope 68a on the tip side of the protrusion 68 of each snap-fit arm 67 is set to the second slope 68b on the base side of the protrusion 68 of each snap-fit arm 67.
If it is larger than the inclination angle θ _{2 of the} snap fitting arm 6 becomes larger than the pulling strength, on the contrary, the snap fit arms 6
If the inclination angle θ ₂ of the second slope 68b on the root side of the protrusion 68 of No. ₇ is larger than the inclination angle θ ₁ of the first slope 68a on the tip side of the protrusion 68 of each snap-fit arm 67, the amount of pulling force is increased. However, it becomes larger than the ability when wearing it.

Thus, the inclination angle θ ₁ of the first slope 68a on the tip side of the projection 68 of each snap-fit arm 67 is
By adjusting the inclination angle θ with the inclination angle θ ₂ of the second slope 68b on the base side of the protrusion 68 of each snap-fit arm 67, the amount of attachment force and the amount of pull-out force can be adjusted. Although the number of the snap-fit arms 67 is two in this embodiment, it may be three, four or more.

Next, the treatment section drive unit 9 is connected to the connecting part in which the sheath unit 7 is connected to the operation section 3 in the above-described procedure.
A method of assembling will be described. First, the treatment section drive unit 9 is inserted into the sheath unit 7 through the distal end opening of the sheath unit 7. At this time, the treatment section drive unit 9 is inserted into the sheath unit 7 from the spherical portion 47 side of the rear end portion. In addition, during the insertion work of the treatment section drive unit 9, the movable operation handle 71 is previously shown in FIG.
As shown in (B), the rubber cap 76 is awaited in a state of being rotated counterclockwise in the figure until it hits the rubber cap 76.

In the treatment section drive unit 9 inserted into the sheath unit 7, the spherical portion 47 is projected to the outside from the inlet / outlet 76a of the rubber cap 76 at the rear end of the insertion section connection section 73 of the operation section 3. Pushed in until During the insertion operation of the treatment section drive unit 9, as shown in FIG. 11 (A), the projecting portion 23 of the treatment section driving unit 9 and the distal end of the projecting section 58 of the sheath unit 7 are brought into abutment with each other to engage with each other. If not, the rotation direction does not match the regular fitting position. In this case, before the treatment section drive unit 9 is inserted to the regular insertion position, the projection 23 of the treatment section drive unit 9 and the projection 58 of the sheath unit 7 are brought into contact with each other by their abutting portions. The insertion operation is stopped so that it cannot be inserted correctly. Therefore, in this case, the amount of protrusion of the spherical portion 47 at the rear end of the treatment section drive unit 9 protruding outside the rubber cap 76 of the operation section 3 becomes small. As shown in FIG. 11B, even if the ball portion 47 is rotated counterclockwise until it hits the rubber cap 76, the sphere portion 47 is moved to the movable operation handle 71.
Cannot be completely accommodated in the ball guide hole portion 80b of the connection groove 80.

Therefore, in such a case, by rotating the treatment section drive unit 9 around the axis with respect to the sheath unit 7, as shown in FIG. 23 and the projecting portion 58 of the sheath unit 7 are properly engaged with each other so that the rotation direction is adjusted to a regular fitting position.

After the positioning operation of the treatment section drive unit 9 in the rotational direction is performed, the operating shaft 12 is held in the pushing position, and both gripping members 5 of the treatment section 6 are kept in the closed position. Then, the treatment section drive unit 9 is further inserted into the sheath unit 7.

When the projecting portion 23 of the treatment section drive unit 9 and the projecting portion 58 of the sheath unit 7 are slightly meshed with each other in a state where they are aligned at the regular rotational position, as shown in FIG.
As shown in (B), the spherical portion 4 at the rear end portion of the treatment portion drive unit 9 protruding to the outside of the rubber cap 76 of the operation portion 3.
7 is larger than the position shown in FIG. 11 (B).

Further, as shown in FIG. 12A, the treatment section drive unit 9 is inserted to a position where the protrusion 23 of the treatment section drive unit 9 and the protrusion 58 of the sheath unit 7 start to mesh with each other. At that time, the projection 41 of the snap-fit portion 38 of the treatment section drive unit 9 hits the tip side slope 55a of the inward projection 55 of the connection pipe 53 of the sheath unit 7, and each snap-fit arm 40 bends inward. .

When the treatment section drive unit 9 is further pushed and inserted into the sheath unit 7, FIG.
As shown in (A), the protruding portion 41 completely crosses over the inward protruding portion 55 and enters the storage portion 56, and the tip side slope 41 a of the protruding portion 41 becomes the proximal slope 55 of the inward protruding portion 55.
It contacts the step 57 which is b.

As a result, the protruding portion 5 of the sheath unit 7
The front end surface of 8 abuts on the rear end surface of the projecting portion 23 of the treatment section drive unit 9 and is completely meshed. In this way, when the projecting portion 23 of the treatment section drive unit 9 and the projecting section 58 of the sheath unit 7 are inserted to a position where they are completely meshed with each other, the treatment section drive unit 9 reaches the regular insertion position. It is like this.

When the treatment section drive unit 9 is inserted to the proper insertion position in the sheath unit 7, the spherical portion 47 of the treatment section drive unit 9 and the connection groove 8 of the operation section 3 are simultaneously formed.
An engagement operation with 0 is performed. That is, the distal end surface of the protruding portion 58 of the sheath unit 7 abuts on the rear end surface of the protruding portion 23 of the treatment portion drive unit 9, and the position in the rotational direction is adjusted so as to be completely meshed, and then the treatment portion drive unit. The sphere portion 47 of the treatment portion drive unit 9 is inserted into the inlet hole portion 80 a of the connection groove 80 of the operation portion 3 in the middle of the operation of inserting the sheath portion 9 into the regular insertion position.

In this state, the treatment section drive unit 9 is further added.
The ball portion 47 pushes the connection groove 80 of the operation portion 3 toward the proximal side as the ball is pushed in the normal insertion position direction in the sheath unit 7, and as a result, the movable operation handle 71 is moved to the position shown in FIG. 12B, the ball portion 47 of the connection member 46 is completely inserted into the ball guide hole portion 80b of the connection groove 80 of the movable operation handle 71 as shown in FIG. 12B.

Then, in the state shown in FIG.
By further rotating the movable operation handle 71 in the clockwise direction in FIG.
7 is drawn toward the hand side by the ball guide hole 80b, and as a result, the small diameter portion 48 and the medium diameter portion 49 of the connecting member 46 sequentially enter the connecting member guiding portion 80c as shown in FIG. The operation of assembling the treatment section drive unit 9 to the connection component in which the sheath unit 7 is connected to the section 3 is completed.

Further, as shown in FIGS. 11A and 11B, the projecting portion 23 of the treatment section drive unit 9 and the sheath unit 7 are provided.
When the tips of the connecting member 46 and the projecting portion 58 are in contact with each other, the ball portion 47 of the connecting member 46 does not completely enter the connecting groove 80 of the movable operation handle 71 or the ball guide hole portion 80b. Since it is set to, the treatment section drive unit 9
With the tips of the projecting portion 23 and the projecting portion 58 of the sheath unit 7 butting against each other, the ball portion 47 of the connecting member 46 enters the ball guiding hole portion 80b of the movable operation handle 71, and in that state A force that rotates in a clockwise direction is applied to the movable operation handle 71, so that the projecting portion 23 of the treatment section drive unit 9 and the projecting portion 58 of the sheath unit 7 strongly collide and are not damaged. There is.

Further, when the treatment section drive unit 9 is inserted and mounted at the proper insertion position in the sheath unit 7, the snap fit arms 67, 67 of the sheath unit 7 are inserted.
The operation shaft 12 of the treatment section drive unit 9 is held in the state of being inserted therein. In this case, snap fit arm 6
7, 67, which is the heat-shrinkable tube 51 that covers the pipe cover 45 of the operation shaft 12 and the connecting member 46.
The outer diameter of is the snap-fit arm 6 of the sheath unit 7.
In this state, the operation shaft 12 prevents the snap-fit arms 67, 67 from moving inward because the inner diameters of the arms 67, 67 are substantially the same. Therefore, since the snap fit arms 67, 67 cannot be bent inward,
It is possible to reliably prevent the sheath unit 7 from coming off the operating portion 3.

That is, the operating section 3 and the sheath unit 7
By assembling the treatment section drive unit 9 and the treatment section drive unit 9 in a regular assembly state, it is possible to prevent the sheath unit 7 from coming off from the operation section 3. Therefore, there is no risk that the sheath unit 7 will come off from the operating section 3 during the surgical operation.

The projection 4 of the snap fit arm 40
1 tip side slope 41a and hand side slope 41b
Or the inward projection 5 of the connection pipe 53 of the sheath unit 7.
By changing the slope angle with respect to the central axis of the tip side slope 55a of 5 or the hand side slope 55b, or changing the number of snap fit arms 40 and elasticity,
The amount of attachment / detachment of the treatment unit drive unit 9 with respect to the sheath unit 7 can be variously changed. This is similar to that the amount of attachment / detachment between the sheath unit 7 and the operating portion 3 can be variously changed by changing various conditions such as the snap-fit arm 67 of the snap-fit portion 64 of the sheath unit 7 and the protrusion 68. is there.

Next, the gripping operation of the living tissue by the gripping forceps 1 will be described. First, when the holding members 5 and 5 of the treatment portion 6 are opened, the movable operation handle 71 is further rotated counterclockwise from the state of FIG. 1 in the same figure.
In this case, the operation shaft 12 of the treatment section drive unit 9 is pushed toward the distal end side with the rotating operation of the movable operation handle 71.

Further, the guide pin 36 of each gripping member 5 moves with the movement of the operating shaft 12 so that the W pin member 16
The pin sliding groove 20 moves along the pin sliding groove 20 to the rear end side of the pin sliding groove 20, and the gripping members 5 and 5 open. At this time, the guide pin 36 is further pressed forward by the movement of the operation shaft 12 by the groove side surface 20b on the proximal side of the pin sliding groove 20 at the tip of the W jumper member 16. Therefore, the elongated hole 34 of the gripping member 5 moves toward the distal end side along the caulking pin 35 as the gripping member 5 is pressed and moved toward the distal end side via the guide pin 36, and the gripping members 5 and 5 are further moved. It opens wide and is operated to open to the fully open state shown in FIG.

At this time, the tip small-diameter portion 15c of the operating rod connecting member 15 in the treatment portion drive unit 9 completely enters the inside of the snap-fit arm 40 as shown in FIG. It does not bend inward. Therefore, since the protrusion 41 does not come off from the inner protrusion 55 on the sheath unit 7 side, the movable operation handle 71 is rotated counterclockwise in FIG. 1 during the operation of opening the gripping members 5, 5. The treatment section drive unit 9 does not come off from the sheath unit 7 due to the force acting when opening the grip members 5 and 5.

Further, the center axis of the operation rod connecting member 15 and the center axis of the inner pipe 42 can be accurately aligned by the centering portion 15b of the operation rod connecting member 15. Therefore, with the treatment section drive unit 9, the sheath unit 7, and the operation section 3 combined, the grasping member 5,
When opening and closing 5, the operating rod connecting member 15 can be slid back and forth in the axial direction of the inner pipe 42 of the sheath unit 7 without being displaced in the radial direction. As a result, the central axis of the snap fit arm 40 and the operating rod connecting member 15
Since the tip small diameter portion 15c of the operating rod connecting member 15 can be accurately moved in and out of the snap fit arm 40 without being displaced in the radial direction from the central axis of the tip small diameter portion 15c, the snap fit There is an effect that the tip end surface of the tip small diameter portion 15c of the operation rod connecting member 15 can be prevented from coming into contact with the tip end surface of the arm 40.

Furthermore, if the small-diameter portion 15c of the operating rod connecting member 15 is inside the snap-fit arm 40, the treatment section drive unit 9 will not come off the sheath unit 7 even when the gripping members 5, 5 are closed. Absent.

When the gripping members 5, 5 of the treatment section 6 are closed, the gripping members 5, 5 are indicated by phantom lines in FIG.
The movable operation handle 71 is rotated clockwise in FIG. 1 from the state in which 5 is opened. In this case, the movable operation handle 7
Along with the turning operation of 1, the operation shaft 12 of the treatment section drive unit 9 is pulled to the hand side. Therefore, a force that moves the W-joint member 16 toward the hand side acts, and the operation shaft 12
The guide pin 36 of each gripping member 5 moves along the pin sliding groove 20 of the W jumper member 16 toward the tip end side of the pin sliding groove 20 with the moving operation of the guide pin 36 at this time. Along with the operation, the gripping members 5, 5 rotate about the crimp pin 35 and move in the closing direction.

Here, the pin sliding groove 2 of the W jumper member 16
Since 0 has a clearance S ₁ formed at an appropriate distance in the distal direction from the position of the guide pin 36 when the gripping members 5, 5 are closed, both gripping members 5, 5 have moved in the closing direction. At this time, the guide pin 36 does not come into contact with the terminal end portion of the pin sliding groove 20 on the tip end side when the tip end portions of the both gripping members 5 and 5 come into contact with each other. Therefore, both gripping members 5,
The clearance S ₁ is maintained even after the point of contact of the tip of 5
Since it is possible to pull the operation shaft 12 to the side closer to the hand by a distance equivalent to, the force applied to the movable operation handle 71 can be sufficiently transmitted to the tip side of the gripping members 5 and 5, and a thin film shape can be obtained. There is an effect that the living tissue can be strongly and reliably gripped between the gripping members 5 and 5.

The amount of the clearance S ₁ may be arbitrarily adjusted according to the amount of force desired to be applied to the grip members 5, 5.
In some cases, the pin sliding groove 20 may penetrate to the tip side of the W jumper member 16.

Further, in this embodiment, when the gripping members 5 and 5 are closed as shown in FIG. 13B, the inlet hole 80a and the ball guide hole portion of the movable operation handle 71 are shown as shown in FIG. 13A. Since 80b is configured to be substantially perpendicular to the axial direction of the connecting member 46, when the movable operation handle 71 is rotated clockwise in FIG.
The direction of the force applied from 1 to the connecting member 46 via the sphere 47 in the sphere guide hole 80b can be made to coincide with the direction of the force that pulls the connecting member 46 toward the axial direction proximal side. Therefore, the force for closing the gripping members 5, 5 can be obtained most efficiently, so that even if the gripping members 5, 5 are almost closed as in the case of gripping a thin film-like biological tissue, the thin film It is possible to firmly and surely grasp the living tissue in the shape of a circle.

In this embodiment, the ball guide hole 80b and the connecting member guide 80 are held with the gripping members 5, 5 almost closed.
Although c is set to be vertical, the ball guide hole portion 80b and the connecting member guide portion 80c are set to be vertical when the grasping members 5 and 5 are opened at an arbitrary angle according to the type of tissue to be grasped. It may be configured.

Further, when grasping a living tissue or the like with the grasping members 5 and 5, a force for turning clockwise in FIG. 1 is applied to the movable operation handle 71, but this force is stronger than necessary. In this case, the small diameter portion 48 of the connecting member 46 is torn off first. Therefore, it is possible to prevent excessive force from being applied to other parts.

Further, as shown in FIG. 6 (A), the cross-sectional area is smaller near the base of the guide pin 36 on the tip end side of the link arm 33 of each gripping member 5 than the other parts of the gripping member 5. Since the cross-sectional area portion 83 is provided, the pin sliding groove 2 of the W jumper member 16 should be opened or closed when the holding members 5 and 5 are opened and closed.
When an excessive force is applied to the guide pin 36 from the side surface of 0, the minimum cross-sectional area portion 83 of the link arm 33 can be broken before any other portion of the grip member 5. Therefore, there is no possibility of breaking the portion of the grip member 5 other than the minimum cross-sectional area portion 83 of the link arm 33.

While the gripping forceps 1 is being used, the W armature member 16, the link arm 33 of the gripping member 5, and the tip cover 21 are covered with the insulating tube 52, so that the link arm 33 should be disconnected at its minimum. Even if it breaks at the area portion 83, there is no possibility that fragments such as the guide pin 36 will come out of the insulating tube 52 and fall into the body cavity.

When the gripping members 5 and 5 are closed, as shown in FIG.
As shown in (B), the guide pin 36 of the link arm 33 is
When but which it is in contact with the groove side surface 20a of the distal end side of the pin slide slot 20, the guide pin 36 and back appropriate distance between the groove side surface 20b of the proximal side of the pin slide slot 20 Rush S ₂
Since the guide pin 36 of the link arm 33 is brought into contact with the groove side surface 20a on the tip end side of the pin sliding groove 20, as shown in FIG. 1 is opened by rotating the movable operation handle 71 counterclockwise in FIG. 1 to open the operation shaft 12 and the W jumper member 1.
When 6 is pushed to the tip side, after the W jumper member 16 is first moved to the tip side by the distance of the backlash S ₂ ,
Groove side surface 20 on the side closer to the guide pin 36 and the pin sliding groove 20
It can be brought into contact with b.

Therefore, before the guide pin 36 is pressed by the W jumper member 16, as shown in FIG. 14 (B), the tip small diameter portion 15c of the operating rod connecting member 15 is backlashed to the inside of the snap-fit arm 40 with the backlash S ₂ Therefore, the snap fitting arm 40 can be inserted inside by the tip small diameter portion 15c of the operation rod connecting member 15 inserted into the snap fitting arm 40 while the gripping members 5 and 5 are still closed. Bending in the direction can be prevented. As a result, the protrusion 41 of the snap fit arm 40
Also cannot move inward, so that the proximal slope 55b of the inward projection 55 of the sheath unit 7 and the distal slope 41a of the projection 41 can be kept in contact with each other, and the treatment It is possible to prevent the partial drive unit 9 from coming off the sheath unit 7.

This is effective in the following cases in actual use. For example, as shown in FIG. 14, the grasping forceps 1 is inserted into the gap H ₁ of the living tissue H with the grasping members 5 and 5 closed, and then the grasping members 5 and 5 are opened to separate the living tissues H from each other. In this case, a force is applied from the living tissue H side in the direction of closing the gripping members 5, 5. Therefore, if there is no backlash S ₂ in the pin sliding groove 20, after inserting the gripping members 5, 5 into the gap H ₁ of the living tissue H in a closed state, the movable operation handle 71 in FIG. When the gripping members 5 and 5 are rotated counterclockwise and a force is applied in a direction to open the gripping members 5 and 5, a force pushing the operation shaft 12 toward the distal end side, that is, a direction in which the treatment section drive unit 9 is removed from the sheath unit Since force is applied, the snap fit arm 40 may bend inward, the projection 41 may get over the inward projection 55, and may come off, and the treatment section drive unit 9 may come off the sheath unit 7. On the other hand, by providing the above-mentioned backlash S ₂ in the pin sliding groove 20 as in the present embodiment, the operation rod connecting member 1 is operated with the gripping members 5 and 5 closed.
Since the small-diameter portion 15c of the distal end 5 can be inserted into the snap-fit arm 40, the treatment section drive unit 9 does not come off from the sheath unit 7 during the above-described peeling operation of the biological tissue H, which is safe. It has the effect of being operable.

Incidentally, the W jumper member 16 and the tip side operation rod 13
Since the front end of the operating rod 13 and the rear end of the operating rod 13 and the distal end of the operating rod connecting member 15 are screwed together, adjust the screwing condition of each screwed portion. Thus, the position of the operation rod connecting member 15 with respect to the snap fit arm 40, that is, the position of the tip small diameter portion 15c of the operation rod connecting member 15 can be adjusted in the axial front-rear direction.

Further, the W jumper member 16 and the tip side operation rod 13
May be integrally formed, or the distal end side operating rod 13 and the operating rod connecting member 15 may be integrated, or the operating rod connecting member 15 and the hand side operating rod 14 may be integrated, or the distal end side operating rod 13 may be formed. The hand side operation rod 14 and the operation rod connecting member 15 may be integrated.

Further, the radius of curvature of the tip side contact surface 36a of the guide pin 36 of each gripping member 5 is formed to be substantially the same as the radius of curvature of the tip side groove side surface 20a of the pin sliding groove 20, Since the radius of curvature of the side contact surface 36b is formed to be substantially the same as the radius of curvature of the groove side surface 20b on the proximal side of the pin sliding groove 20, the guide pin 3 of each gripping member 5 is formed.
6, the contact area between the tip side abutting surface 36a and the tip side groove side surface 20a of the pin sliding groove 20, and the proximal side abutting surface 36b of the guide pin 36 and the proximal side of the pin sliding groove 20. The contact area with the side surface 20b can be made larger than when using a guide pin having a circular cross section. Therefore, when the opening / closing operation of the gripping members 5 and 5, the wear of the tip side contact surface 36a and the hand side contact surface 36b of the guide pin 36 of each gripping member 5 that slides with the pin sliding groove 20 is reduced. is there.

The tip end side contact surface 36a and the proximal side contact surface 36b of the guide pin 36 of each gripping member 5 may be linear, and the radius of curvature thereof may be arbitrarily selected as required.

When grasping the living tissue H, the operating portion 3 is operated as described above according to the size of the living tissue H to be grasped, and as shown by the phantom line in FIG. After opening the gripping members 5, 5, the movable operation handle 71 is rotated clockwise in FIG. 1 to close the gripping members 5, 5 as shown by the solid line in FIG. 1 to grip the biological tissue. .

Then, if necessary, a power transmission cord cap from a high frequency power source (not shown) is fitted into the electrode pin 74 of the operation section 3 and a high frequency current is caused to flow, so that the electrode pin 74 is inserted into the insertion section connecting section 73 and the snap fitting section 64. , Inner pipe 42, connection pipe 53, snap-fit part 3
8, gripping members 5, 5 are energized through the tip cover 21 and the crimping pin 35 in order, and treatments such as cauterization of the living tissue H gripped between the gripping members 5, 5 and hemostasis of the bleeding part are performed. It

In addition, the link arm 33 of the grip member 5,
Insulation tube 5 for W jumper member 16, tip cover 21, etc.
Since it is completely covered by 2, the high frequency current does not leak from these portions when the high frequency current is applied. Therefore, a high-frequency current flows only in both gripping members 5 and 5, and only the living tissue H that is in contact with both gripping members 5 and 5 can be cauterized with certainty, so that the tip cover 21 not intended by the operator or The W tissue member 16 and the link arm 33 of the grip member 5 can be prevented from being cauterized by contact with the biological tissue H.

Further, when the living tissue H or the like is strongly grasped by the grasping members 5 and 5, a force for strongly rotating the movable operation handle 71 in the clockwise direction in FIG. When 46 is strongly pulled to the hand side, the entire treatment section drive unit 9 is pulled to the hand side. Therefore, the distal end cover 21 of the treatment section drive unit 9 is
Since the connection pipe 53 of the sheath unit 7 that is in contact with is strongly pressed toward the hand side, the sheath unit 7 is pressed against the insertion portion connection portion 73 of the fixed handle 70. As a result, of the stepped portion between the rear end abutting surface 65a of the connection pipe 65 of the snap fit portion 64 of the sheath unit 7 and the large diameter portion 77 and the small diameter portion 78 of the insertion portion connection portion 73 of the fixed handle 70. The butting surface 77a strongly abuts.

At this time, a strong frictional force is generated between the rear end abutting surface 65a of the connecting pipe 65 and the abutting surface 77a of the insertion portion connecting portion 73, so that the sheath unit 7 is not attached to the operating portion 3. It can be held around its axis in a state where it cannot be easily rotated.

During the gripping operation, the sheath unit 7 does not easily rotate due to the frictional force generated between the rear end abutting surface 65a of the connecting pipe 65 and the abutting surface 77a of the insertion portion connecting portion 73. However, in a case other than the grasping operation state, the sheath unit 7 can be rotated by rotating the rotary knob 61 with fingers or the like. At this time, the protruding portion 58 of the distal end cover 21 of the sheath unit 7 and the protruding portion 23 of the distal end cover 21 of the treatment portion drive unit 9 mesh with each other, so that the sheath unit 7 with respect to the operation portion 3 is in contact.
When rotating the, the sheath unit 7 and the treatment section drive unit 9 rotate together.

When the treatment section drive unit 9 is detached from the sheath unit 7 after the surgical operation is completed, the procedure shown in FIG.
As shown in (A) and (B), with the gripping members 5 and 5 completely closed, the movable operation handle 71 is lightly turned clockwise in FIG. With this operation, the treatment section drive unit 9
After pulling the operation shaft 12 of the No. 1 toward the hand side so that the distal end small-diameter portion 15c of the operation rod connecting member 15 is completely pulled out to the outside of the snap-fit arm 40, the gripping members 5 and 5 are finger-operated or the like. Pinch to pull out the treatment section drive unit 9 from the sheath unit 7.

At this time, the tip side slope 41a of the projection 41 of the snap-fit arm 40 is pressed inward by the proximal slope 55b of the inward projection 55, and the snap-fit arm 40 bends inward, and the projection 41 is bent. Rides over the inward projection 55 and comes off to the tip side. In this state, the treatment section drive unit 9 is further pulled out, and at the same time, the movable operation handle 71 is rotated counterclockwise in FIG. 1 to bring it to the state of FIG. 11 (B) to connect the spherical portion 47 of the connecting member 46. The treatment section drive unit 9 can be completely withdrawn from the sheath unit 7 by removing it from the ball guide hole 80b of the groove 80.

Further, the tip small diameter portion 15 of the operating rod connecting member 15
A tapered taper portion 15d is formed on the tip end side surface of c, and the projection 41 of the snap-fit arm 40 is formed.
Since the taper portion 40a corresponding to the taper portion 15d of the operation rod connecting member 15 is formed on the inner side of the proximal end surface of the, the protruding portion 41 is formed inside when the treatment portion drive unit 9 is pulled out from the sheath unit 7. The taper portion 40a of the snap-fit arm 40 is pushed inward by the proximal slope 55b of the side projection 55, so that the operation rod connecting member 1
The taper portion 15d can be pressed toward the hand side by being brought into contact with the taper portion 15d of No. 5. Therefore, the small-diameter portion 15c of the operation rod connecting member 15 can be easily pushed out from the inside of the snap-fit arm 40 toward the hand side.
The protrusion 41 can be easily bent inward, and the treatment section drive unit 9 can be easily pulled out from the sheath unit 7.

Further, as shown in FIG. 14 (A), between the grip portion 31 of each grip member 5 and the link arm 33, a protruding portion slightly outwardly protruding from the insulating tube 52 to the outside. 81 is provided. This is formed so as to be slightly smaller than the outer diameter dimension of the insulating tube 52 with the gripping members 5 and 5 closed.

When the protruding portion 81 is not provided, the grip portion 31 and the link arm 33 of each grip member 5 are provided.
Since there is a gap in a portion slightly outside the insulating tube 52 between and, the gripping members 5 and 5 are closed after the treatment section drive unit 9, the operation section 3 and the sheath unit 7 of the main gripping forceps 1 are assembled. When inserted into or removed from the trocar mantle tube (not shown) in this state, the airtight holding valve inside the trocar mantle tube may enter or hit the gap there, which may hinder insertion or removal. . On the other hand, in the present embodiment, by providing a protruding portion 81 that protrudes slightly outward from the insulating tube 52 between the holding portion 31 of each holding member 5 and the link arm 33, This has the effect of reducing the gap and preventing the airtightness retaining valve in the trocar mantle from entering there.

When the rubber plug 63 is removed from the water injection cock 44 and a water supply tube or the like (not shown) is attached to the water injection cock 44 and water or physiological saline is supplied, the inner peripheral surface of the inner pipe 42 of the sheath unit 7 becomes Treatment unit drive unit 9
Of the operating rod connecting member 15
Passing between the notch surface 43 of the inner pipe 42 and the inner peripheral surface of the inner pipe 42, and the inner peripheral surface of the snap fit portion 38 and the tip side operation rod 1
3 through the water supply groove 17b of the W jumper member 16 and comes out from the distal end surface of the insulating tube 52 of the sheath unit 7.

As described above, since the operation rod connecting member 15 is provided with the notch surface 43 and the W connecting member 16 is provided with the water supply groove 17b, water can be supplied from the water injection cock 44 to the tip surface of the insulating tube 52. It is also possible to send physiological saline or the like from the cock 44 into the body cavity, and the water supply makes it possible to clean the inner peripheral surface of the inner pipe 42 of the sheath unit 7.

In addition, the rubber plug 63 attached to the sheath unit 7 and the rubber cap 76 attached to the operating portion 3 are matched in color to show a proper combination of the sheath unit 7 and the operating portion 3. You can For example, rubber stopper 6
3 and the rubber cap 76 may be the same color, the sheath unit 7 and the operating portion 3 may be combined, but when the rubber plug 63 and the rubber cap 76 have different colors, they cannot be combined or combined. It can be indicated by the color combination of the rubber plug 63 and the rubber cap 76. Accordingly, it is possible to determine at a glance whether or not the sheath unit 7 and the operation unit 3 can be combined.

Similarly, the color of the pipe cover 45 and the heat shrinkable tube 51 of the treatment section drive unit 9 is also a combination of the colors of the rubber plug 63 and the rubber cap 76, and the sheath unit 7, the operation section 3 and the treatment section 3 are treated. It can also indicate whether or not it can be combined with the partial drive unit 9.

Therefore, the following effects can be obtained with the above structure. That is, in the present grasping forceps 1, the clearance of an appropriate distance in the distal direction is larger than the position of the guide pin 36 at the time when the grasping members 5 and 5 are closed in the pin sliding groove 20 of the grasping member connecting portion 18 of the W jumper member 16. Since S ₁ is formed, when the gripping members 5, 5 move to the closed position during the operation of moving the gripping members 5, 5 of the treatment portion 6 from the open position to the closed position, the guide pin 36 of each gripping member 5 moves. It is possible to prevent the W sliding member 16 from reaching the end position of the pin sliding groove 20.

Therefore, after the gripping members 5, 5 of the treatment portion 6 have moved to the closed position, when the operating force in the direction of closing the gripping members 5, 5 is further strongly applied to the movable operation handle 71 of the operating portion 3. In addition, since the guide pin 36 can be further advanced along the pin sliding groove 20 and the operation force thereof can be sufficiently transmitted to the tip end portions of the gripping members 5 and 5, the gripping forceps 1 is used to intest the inside of the body cavity. Gripping member 5, such as thin film tissue such as the mesentery
When performing an operation of gripping and peeling between the gripping members 5 and 5, the operating force applied to the movable operation handle 71 of the operation unit 3 is applied even after the gripping members 5 and 5 are closed in the fully closed state.
5, which can be sufficiently transmitted to the tip side of the gripping member 5,
The force for gripping a thin-film-like tissue such as mesentery can be sufficiently increased between the five. As a result, it is possible to prevent the thin film-like tissue such as the mesentery from falling out from between the forceps holding members 5, 5 when performing an operation of peeling the thin-film-like tissue between the holding members 5, 5 while holding it. It is possible to enhance the operability of the operation of peeling off the thin film tissue.

16A to 16D show the second embodiment of the present invention. In this embodiment, the distal end cover 21 of the treatment section drive unit 9 in the first embodiment,
Between the snap fit portion 38 and the connection pipe 37, as shown in FIG.
As shown in FIG. 6 (A), a screw type connection portion 91 is provided.

Further, as shown in FIG. 16B, the connecting pipe 37 of the snap fit portion 38 has an extending portion 92 extending toward the proximal side at the rear end portion of the snap fit arm 40 of the first embodiment. It is connected. As shown in FIG. 16 (D), an annular portion 93 which is annularly connected is formed at the proximal end of the extending portion 92.

Also, the three slits 3 in the first embodiment are used.
In this embodiment, the portion corresponding to 9 is shown in FIG.
As shown in (C), four cutout holes 94 are formed, and snap fit arms 40 are formed between the cutout holes 94, respectively. The number and width of the cutout holes 94 can be changed as necessary.

Further, the taper portion 40a of the projection 41 of the snap-fit arm 40 is inside the snap-fit arm 40, and the tip small diameter portion 15c of the operating rod connecting member 15 is located between the annular portion 93 and the projection 41. First as much as the distance
Is formed longer than that of the embodiment. The configuration of the parts other than the above-mentioned parts is the same as that of the first embodiment, and the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Therefore, even in the case of the above-mentioned configuration, as in the first embodiment, the connecting portion between the three units of the treatment section drive unit 9, the sheath unit 7, and the operation section 3 of the grasping forceps 1 is screw type. Is not provided, the treatment section drive unit of the grasping forceps 1 is different from the conventional case where a screw-type connection mechanism is used for the connection section between a plurality of constituent members constituting the main body of the treatment tool. The attachment / detachment work between the three units including the sheath unit 7, the sheath unit 7, and the operation unit 3 can be easily performed in a short time, and the disassembling and assembling work of the main grasping forceps 1 can be facilitated.

Further, this embodiment has the following effects. That is, the tip cover 21 and the snap fit portion 3
8 is connected to the connection pipe 37 via a screw-type connection portion 91, so that the treatment portion drive unit 9 and the sheath unit 7 are repeatedly attached and detached, for example, snapping. If the protrusion 41 of the fit arm 40 is worn or damaged, the snap fit portion 38
If it occurs in the connection pipe 37, the connection portion 91 can be loosened and the connection pipe 37 of the snap fit portion 38 can be removed from the tip cover 21 and replaced.

Further, the extension portion 92 of the snap-fit arm 38 of the snap-fit portion 38, which extends from the proximal side, is connected,
Since each snap fit arm 40 of the snap fit portion 38 is formed in the double-supported beam structure by forming the annular portion 93 at the proximal end of the extending portion 92, the proximal side of the snap fit arm 40 is, for example, treated. Part drive unit 9
There is an effect that it is possible to prevent the sheath unit 7 from being unfastened due to being caught by something and being bent in the outer diameter direction when the sheath unit 7 is attached and detached.

17A to 17G show the third embodiment of the present invention. The present embodiment is a modification of the configuration of the treatment section 6 in the first embodiment. That is, the treatment section 6 of the present embodiment is provided with a fixed blade 101 and a movable blade 102, as shown in FIGS. 17A and 17B, instead of the gripping members 5 and 5 of the first embodiment. A treatment member 103 for cutting is provided.

Here, in the fixed blade 101, one support arm 22 of the tip cover 21 in the first embodiment is extended in the tip direction, and is connected to this extended end portion. An arcuate cutting blade 104 is provided on the upper surface of the fixed blade 101.

Further, as shown in FIG. 17D, a caulking pin 105 is caulked and fixed between the fixed blade 101 and the tip of the other supporting arm 22. The movable blade 102 is rotatably supported by the crimp pin 105.

Further, the tip side operation rod 13 of the operation shaft 12 of the first embodiment is extended in the tip direction, and the extension end portion has the base end portion of the movable blade 102 as shown in FIG. 17 (E). Are rotatably caulked by caulking pins 106. Here, the flat portion 10 that is flat at the tip of the operating rod 13 is used.
7 are formed. An elliptic caulking hole 108 is formed in the flat portion 107. The caulking pin 106 is inserted into the caulking hole 108. further,
In the flat portion 107 of the operation rod 13, a backlash S ₂ is formed between the caulking pin 106 and the side surface of the caulking hole 108 on the proximal side of the caulking hole 108 at an appropriate distance.

Further, FIG.
As shown in (F), when the movable blade 102 rotates around the crimp pin 105, a flat surface portion 109 is formed to prevent the operation rod 13 from coming into contact with the inner peripheral surface of the tip cover 21. . That is, by moving the operating rod 13 in the front-back direction by opening / closing the movable operating handle 71 of the operating portion 3, the movable blade 102 causes the caulking pin 105 to move.
It is designed to rotate around. At this time, as the movable blade 102 rotates, the operation rod 13 moves to the tip cover 2
Although it moves up and down inside 1, the flat surface portion 109 of the lower surface of the operating rod 13 prevents the lower surface of the operating rod 13 from colliding with the inner peripheral surface of the tip cover 21.

Also, unlike the first embodiment, the tip cover 21 and the snap fit portion 38 are integrally formed in this embodiment. Further, as shown in FIG. 17 (G), the centering portion 15b of the operation rod connecting member 15 is formed with two notch surfaces 43 for guiding running water. The notch surface 43 for the running water guide may have any number and shape (whether it is a flat surface or a curved surface or a groove) as long as running water can be secured. The configuration of the parts other than the above-mentioned parts is the same as that of the first embodiment, and the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of the above configuration will be described.
First, when the treatment tool of this embodiment is used, the operation shaft 12 moves back and forth with the opening / closing operation of the movable operation handle 71, and the movable blade 102 moves around the caulking pin 105 with the operation of the distal end side operation rod 13 of the operation shaft 12. The movable blade 102 opens and closes with respect to the fixed blade 101 by rotating as.
Then, by opening / closing the movable blade 102, the living tissue or the like is cut off.

Here, when the movable blade 102 is opened from the closed state, the caulking hole 108 is moved along the caulking pin 106 by a distance corresponding to the backlash S ₂ along with the movement of the operating rod 13 in the distal direction. Slide to the end of the caulking hole 108 on the near side, and the caulking pin 10
6 abuts. At this time, also in this embodiment, as in the first embodiment, each snap fit arm 40 of the snap fit portion 38 is at the tip end side of the tip small diameter portion 15c of the operation rod connecting member 15.
Since it penetrates into the inside of the, the protruding portion 41 cannot be bent inward. As a result, the treatment section drive unit 9 does not come off from the insertion section unit during the operation of opening the movable blade 102 from the closed state.

Then, the caulking pin 106 has the caulking hole 10
When the operating shaft 12 is further pushed toward the tip after hitting the proximal end of 8, the movable blade 102 starts to open around the crimp pin 105 by being pushed by the tip operating rod 13.

Therefore, even with the above-mentioned structure, a screw-type connecting mechanism is not provided in the connecting portion between the three units of the grasping forceps 1, that is, the treatment section driving unit 9, the sheath unit 7, and the operating section 3. Therefore, as compared with the conventional case where a screw-type coupling mechanism is used for a connecting portion between a plurality of constituent members constituting the main body of the treatment tool, the treatment portion drive unit 9, the sheath unit 7, and the operating portion of the grasping forceps 1 are compared. The work of attaching and detaching the three units 3 can be easily performed in a short time, and the disassembling and assembling work of the main grasping forceps 1 can be facilitated.

Further, FIGS. 18A to 18C and FIG.
(A) and (B) show a fourth embodiment of the present invention. In this embodiment, the structure of the grasping member 5 of the treatment tool similar to that of the first embodiment is changed as shown in FIGS. 18 (A) to (C), and the structure of the sheath unit 7 is shown in FIG. 19 (A),
This is modified as shown in (B).

That is, in this embodiment, as shown in FIG. 18A, the main body 111 of the gripping member 5 is provided with the bending portion 112 which is bent leftward toward the tip end in the figure.
An inner curved surface 11 is formed on the curved portion 112 of the grip member main body 111 so as to facilitate the peeling operation of the biological tissue.
2a and the outer curved surface 112b are provided, respectively. Here, the inner curved surface 112a is set to have a shape that matches the outer diameter of a tubular tissue such as a blood vessel, and is effective for the peeling operation of these.

Further, as shown in FIG. 18C, the joint surface (grasping surface) of the grip member main body 111 with the other grip member 5 is curved in the same direction as the curving direction of the curving portion 112, as shown in FIG. 18C. A vertical groove 113 is provided. As a result, when the biological tissue is peeled off or grasped, the biological tissue is grasped by the grasping member main body 11
It is possible to prevent lateral displacement from the first gripping surface.

Further, as shown in FIGS. 18A and 18B, a rectangular groove 114 is provided on the near side of the grip surface of the grip member 5. The groove 114 is not limited to a rectangular shape, but may be a circular shape or any shape.

FIG. 18D shows a modification of the grip member main body 111 of the grip member 5 of the fourth embodiment. FIG. 18D shows the holding member main body 111 of this modified example.
A bending portion 115 that gently bends in the right direction is provided therein. In this case, the two vertical grooves 113 formed on the joint surface (grasping surface) of the grasping member main body 111 with the other grasping member 5 have the inner curved surface 115a and the outer curved surface 115b of the curved portion 115 of the grasping member main body 111. May be provided along each.

In this way, the bending portion 1 of the gripping member main body 111
By providing the two vertical grooves 113 along the inner curved surface 115 a and the outer curved surface 115 b of 15, the curved portion 115
When the living tissue is peeled off using the inner curved surface 115a and the outer curved surface 115b, the tissue is caught in the two vertical grooves 113, so that the peeling can be easily performed. The bending direction and bending rate of the grip member 5, the number of vertical grooves 113, and the length can be changed as necessary.

In the sheath unit 7 of this embodiment, the insulating tube 52 is arranged only near the tip of the sheath unit 7 as shown in FIGS. 19 (A) and 19 (B). The rear end of the insulating tube 52 is the inner pipe 42.
Is arranged up to a position for covering the outer peripheral surface of the tip end portion of

Further, in this embodiment, a large diameter pipe 116 is provided to cover the outer peripheral surface of the inner pipe 42 of the sheath unit 7. The large-diameter pipe 116 is extruded from, for example, polysulfone mixed with glass fibers, and the outer diameter of the large-diameter pipe 116 is formed to be approximately twice the outer diameter of the inner pipe 42. The front end of the large-diameter pipe 116 extends to a position that covers the rear end of the insulating tube 52, as shown in FIG. 19
As shown in (B), the sheath unit 7 is extended to the proximal side connecting portion 60 side of the base end portion and is attached by means such as adhesion. The outer diameter of the large diameter pipe 116 can be arbitrarily made according to the purpose of use, but in this embodiment, the outer diameter is set so that it can be guided by a thick trocar mantle tube (not shown).

Therefore, in the case of the above configuration, FIG.
By combining the treatment section drive unit 9 having the gripping member main body 111 of this embodiment shown in FIGS. 19A to 19C with the sheath unit 7 of this embodiment shown in FIGS. 19A and 19B, a large diameter is obtained. Since it can be used by inserting it into the trocar outer tube of the present invention, the treatment section drive unit 9 having the grip member main body 111 of this embodiment is used as the sheath unit 7 of the first embodiment.
It prevents the curved portion 112 of the grip member main body 111 from protruding outside the circle extending the outer peripheral surface of the insulating tube 52 and making it difficult to insert it into a thin trocar outer tube as in the case of combining with the above. it can.

Further, in this embodiment, as shown in FIG. 19 (B), the inner peripheral surface of the portion of the rubber plug 63 fitted into the mouth of the water injection cock 44 is gradually tapered from the mouth to the back. Since 63 is formed, dust and the like are less likely to collect in the back, and cleaning and disinfection are easy.

20A to 20E show a modification of the sheath unit 7 of the fourth embodiment. In this case, instead of the large-diameter pipe 116 of the fourth embodiment, the tip end side insulating bush 121 is provided on the tip end side of the inner pipe 42 of the sheath unit 7 as shown in FIG.
As shown in (B), the rear end side insulating bushes 122 are respectively arranged, and a reinforcing pipe 123 made of, for example, stainless steel is provided on the outer peripheral surface between the front end side insulating bush 121 and the rear end side insulating bush 122. The reinforcing pipe 123 is provided and covered with an insulating tube 124 made of an insulating material such as fluororesin. Here, the front end side insulation bush 121 and the rear end side insulation bush 1
22 is made of an insulating material such as polysulfone.

As shown in FIGS. 20 (C) to 20 (E), the front end side insulating bush 121, the rear end side insulating bush 122, and the reinforcing pipe 12 with respect to the axial center position of the inner pipe 42.
3. The axis position of the insulating tube 124 is eccentrically provided.

Therefore, in the case of the above structure, the tip end side insulating bush 12 is positioned with respect to the axial center position of the inner pipe 42.
1, the rear end side insulating bush 122, the reinforcing pipe 123, and the insulating tube 124 are provided eccentrically with respect to the axial center position, so that the sheath unit 7 of the present modified example has the gripping member main body 111 shown in FIGS. When the treatment section drive unit 9 having the
There is an effect that the curved distal end portion of 2 can be extended outward depending on the eccentricity of the sheath unit 7.

Further, in the sheath unit 7 of the present modification, the outer diameter dimension φX of the tip side insulating bush 121, the outer diameter dimension φY of the insulating tube 124, and the rear end side insulating bush 122.
Since the relationship with the outer diameter dimension φZ is set so that X <Y <Z, there is an effect that it is easy to insert into and remove from the trocar mantle tube. If necessary, X = Y =
It may be set to Z.

21 (A) and 21 (B) show a modification of the holding member 5 of the first embodiment. This is one in which an insulating member 132 is provided on the back surface (the surface opposite to the grip surface 131a) of the main body 131 of the grip member 5 by, for example, plastic insert molding. The insulating member 132 may be an insulating material such as ceramic.

Furthermore, the groove 1 for preventing the insulating member 132 from slipping off the outer peripheral surface of the grip member main body 131.
33 are provided. This may be a hole or the like. here,
The groove 1 of the grip member body 131 is formed on the inner peripheral surface of the insulating member 132.
A protruding portion 134 to be inserted into 33 is formed.

Therefore, in the structure described above, the insulating member 132 is arranged on the back surface of the grip member main body 131.
Even when the biological tissue is in contact with other than the gripping surface 131a of the gripping member main body 131, the high-frequency current can flow only to the gripping surface 131a. Therefore, there is no risk of cauterizing a place not intended by the operator with a high frequency current.

21 (A) and 21 (B) show the structure in which the insulating member 132 is provided so as to cover only the back surface of the grip member main body 131, but the grip surface 131a of the grip member main body 131 has a high frequency. An insulating member 132 may cover a place where current should not be applied, and in some cases, the grip member main body 1
The whole 31 may be covered with the insulating member 132, and the metal part may be exposed only at the place where the high-frequency current is desired to flow.

In FIG. 21C, a scissors-shaped treatment portion 142 having a pair of scissors blades 141 is provided at the distal end portion of the treatment portion drive unit 9 in place of the gripping members 5 and 5 of the first embodiment. It shows a modified example.

Further, the tip end surface of each scissor blade 141 is finished in a state of being curved along a radius R from the center position of the crimp pin 35 to the tip end surface of each scissor blade 141. The configuration of the parts other than the above-mentioned parts is the same as that of the first embodiment, and the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

22 (A) and 22 (B) show a scissor-shaped treatment portion 152 provided with a pair of scissor blades 151 formed in an arc shape instead of the gripping members 5 and 5 of the first embodiment. It shows a modified example provided at the distal end of the treatment section drive unit 9.

Further, in this modification, as shown in FIG. 22 (A), it is sandwiched by the link arms 33 of the scissors blades 151 in the substantially rectangular flat plate-like holding member connecting portion 18 at the tip of the W jumper member 16. Both link arms 33 and 3
A narrow portion 153 having a width slightly smaller than the gap between the three is formed, and both link arms 3 are provided on the near side.
A wide portion 154 having substantially the same width as the gap between the spaces 33 and 33 is formed. The configuration of the parts other than those described above is the first
The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Therefore, in the structure described above, when the operation shaft 12 of the treatment section drive unit 9 is advanced in the distal direction when both scissors blades 151, 151 are opened, the gripping member connection of the W jumper member 16 is performed. In the range where the narrow portion 153 of the portion 18 is sandwiched between the link arms 33, 33, no frictional force is generated between the link arms 33, 33 and the narrow portion 153. The operation of advancing in the tip direction can be smoothly performed. The proximal ends of both link arms 33, 33 are W
When it moves to a step portion between the narrow portion 153 of the gripping member connecting portion 18 and the wide portion 154 on the proximal side, the vicinity of the tip of the tip small diameter portion 15c of the operating rod connecting member 15 is the protruding portion 41.
It is designed to be inserted inside the.

Further, the operation shaft 1 of the treatment section drive unit 9
2 is further advanced to widen the wide portion 154 of the W jumper member 16.
After moving to a position between the link arms 33, 33, a large force is required to move the operating shaft 12 forward. At this time, even if force is applied in the direction of pulling out the treatment section drive unit 9 from the sheath unit 7, the distal end small-diameter portion 15
Since c is inside the protrusion 41, the protrusion 41 of the snap-fit arm 40 is not likely to bend inward.
As a result, the treatment section drive unit 9 does not come off from the sheath unit 7 during the operation of opening both scissors blades 151, 151, and the opening operation of both scissors blades 151, 151 can be performed reliably.

23 (A) to 25 (B) show a fifth embodiment of the present invention. Here, FIG.
(A) and (B) show the sheath unit 7 of the present embodiment,
24 (A) to 24 (C) and FIGS. 25 (A) and 25 (B) show the treatment section drive unit 9 of this embodiment.

In this embodiment, the sheath unit 7 has almost the same structure as that of the fourth embodiment. That is, the outer peripheral surface of the inner pipe 42 is covered with the large diameter pipe 161. The tip portion of the large diameter pipe 161 extends to the outside of the tip portion of the connection pipe 53 as shown in FIG.
The connection pipe 53 is covered with the large diameter pipe 161.

Further, an insulating tube 162 is arranged on the outer peripheral surface side of the large diameter pipe 161. The outer diameter dimension of this insulating tube 162 is set to be the same as the outer diameter dimension of the large diameter pipe 161, and the outer peripheral surface of the distal end portion of the large diameter pipe 161 is covered with this insulating tube 162. The outer diameters of the large diameter pipe 161 and the insulating tube 162 are set so as to be guided by the large diameter trocar outer tube.

The distal end cover 21 of the treatment section drive unit 9 is formed to have a relatively large outer diameter so that it can be accommodated in the large-diameter insulating tube 162 of the sheath unit 7. Further, the outer diameter dimension of the W jumper member 16 is also increased according to the shape of the tip cover 21.

Further, the main body 163 of each gripping member 5 is formed to have a relatively large outer diameter so that it can be housed in the large-diameter insulating tube 162 of the sheath unit 7. And, as shown in FIG. 24 (A), a curved portion 164 curved inward is formed at the tip of each grip member main body 163. Further, as shown in FIG.
As shown in (C), a substantially triangular window portion 165 is provided.

Therefore, the above-mentioned structure has the following effects. That is, by forming each component such as the large-diameter pipe 161 of the sheath unit 7 and each grasping member main body 163 of the treatment section drive unit 9 arranged at the distal end portion of the insertion portion 2 of the grasping forceps 1 to have a large diameter. Therefore, even a larger tissue in the body cavity can be reliably grasped.

By increasing the length of each gripping member 5, each gripping member 5 is shorter than when the length of each gripping member 5 is short when a living tissue is grasped between the gripping members 5 and 5. Since a large amount of bending can be generated, it is difficult to apply an excessively large force to the living tissue, and there is an effect that the risk of damaging the tissue is reduced.

FIG. 26 shows the grasping forceps 1 of the first embodiment.
2 shows a state in which the A-code base 172 of the A-code 171 is connected to the electrode pin 74 attached to the fixed handle 70 of FIG.

The A-code mouthpiece 172 is composed of an electrode pin connecting portion 173 made of metal such as stainless steel, an insulating knob 174 for covering the electrode pin connecting portion 173, and the like. Here, the insulating knob 174 is made of, for example, plastic such as polysulfone or other insulating material. Further, the tip surface 17 of the insulating knob 174 is
4a is projected longer than the tip end surface 173a of the conduction electrode pin connection portion 173.

The electric wire 175 in the A cord 171 is connected to the electrode pin connecting portion 173. Then, a high-frequency current sent from a high-frequency power source (not shown) through the electric wire 175 in the A cord 171 is applied to the conductive electrode pin connecting portion 1
73 is conducted, and the electrode pin 74 of the grasping forceps 1 is energized from the conducting electrode pin connecting portion 173.

Therefore, in the structure described above, the tip end surface 174a of the insulating knob 174 has the conductive electrode pin connecting portion 17
Since it is projected further longer than the tip surface 173a of No. 3, compared with the case where the position of the tip surface 174a of the insulating knob 174 and the position of the tip surface 173a of the electrode pin connecting portion 173 are arranged at the same position, When the cord cap 172 is connected to the electrode pin 74, the tip surface 17 of the insulating knob 174 is
4A and the insertion portion connecting portion 73 of the fixed handle 70 have the effect of reducing high-frequency current leakage from the abutting surface 176.

FIG. 27A shows a first modification of the structure of the connecting portion between the electrode pin 74 of the grasping forceps 1 and the A-code mouthpiece 172 of the A-code 171. This is provided with a tapered surface 174b whose inner diameter gradually expands toward the tip side in a portion of the insulating knob 174 projecting from the tip surface of the electrode pin connection portion 173.
Corresponding to this, the insulating pipe 75 below the electrode pin 74 is also provided with a tapered surface 75a whose outer diameter gradually increases as it goes downward in FIG.

Therefore, in the structure described above, when the A-code mouthpiece 172 is connected to the electrode pin 74, the tapered surface 174b of the insulating knob 174 and the tapered surface 75a of the insulating pipe 75 can be brought into close contact with each other. Insulation knob 1
There is an effect that, for example, water or physiological saline can be prevented from entering the lower end surface side of the electrode pin connection portion 173 from the abutting surface 176 between the tip end surface 174 a of 74 and the insertion portion connection portion 73 of the fixed handle 70. Therefore, the electrode pin connection portion 173
There is an effect that high-frequency current can be prevented from leaking from the abutting surface 176 between the front end surface 174a of the insulating knob 174 and the insertion portion connecting portion 73 of the fixed handle 70 through water that invades into the lower end surface side or physiological saline.

FIG. 27B shows a second modified example of the structure of the connecting portion between the electrode pin 74 of the grasping forceps 1 and the A-code mouthpiece 172 of the A-code 171. This is the insulating knob 174 on the insulating pipe 75 under the electrode pin 74.
A peripheral wall 181 is provided to cover the outer peripheral surface near the tip of the.

Therefore, in the case of the above configuration, FIG.
Further, there is an effect that high-frequency current leakage from the abutting surface 176 between the tip end surface 174a of the insulating knob 174 and the insertion portion connecting portion 73 of the fixed handle 70 can be reliably prevented.

28A to 28C show the fifth embodiment of the present invention. This is shown in FIG. 28 in the elongated holes 34 of the link arm 33 of each gripping member 5 of the first embodiment.
As shown in (B), the clearance S ₃ is provided at an appropriate distance which is further extended in the distal direction from the position of the crimp pin 35 at the time when the gripping members 5 and 5 are closed. The configuration of the parts other than the above-mentioned parts is the same as that of the first embodiment, and the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Therefore, the following effects can be obtained with the above-mentioned structure. That is, since the elongated hole 34 is extended in the front end direction and the clearance S ₃ is formed, after closing the gripping members 5 and 5, the gripping members 5 and 5 are further attached to the operation portion 3.
By applying an operating force in the direction of closing the gripping members 5 and 5 in a range in which the crimping pin 35 in the elongated hole 34 moves in the direction in which the clearance S ₃ decreases, the gripping members 5 and 5 are slightly bent. be able to. By slightly bending the gripping members 5 and 5 in this way, a strong gripping force can be generated at the tips of the gripping members 5 and 5, so that, for example, a thin film tissue in a living body is gripped between the gripping members 5 and 5. In such a case, a strong gripping force can be applied to the tips of the gripping members 5, 5 to grip a thin membranous tissue more strongly, which is very effective.

29A and 29B show a sixth embodiment of the present invention. This is the tip side operating rod 1
The gripping members 5, 5 are attached to the tip of the W jumper member 16 at the tip of 3.
The proximal end of each of the gripping members 5 is rotatably connected via a crimping pin 191, and an elongated hole 192 which is a cam groove of the cam mechanism K is formed between the gripping portion 5a on the tip side of each gripping member 5 and the crimping pin 191. The cam pin 193 is inserted into the elongated hole 192.

Here, both ends of the cam pin 193 are fixed by crimping to the tips of the two support arms 22 of the tip cover 21, respectively. Further, the oblong hole 192 moves along the cam pin 193 during the operation of moving the grasping member 5 from the open position shown in FIG. 29 (A) to the closed position shown in FIG. 29 (B) in the oblong hole 192 of each grasping member 5. The length of the elongate hole 192 on the tip side is set to be longer than the operating range.
Further, a clearance S ₄ is formed in the elongated hole 192 so as to extend in the front end direction from the position of the cam pin 193 at the time when the grip member 5 is closed. The configuration of the parts other than the above-mentioned parts is the same as that of the first embodiment, and the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of the above configuration will be described.
When the gripping members 5, 5 of the treatment section 6 are operated to be closed from the open position shown in FIG. 29A to the closed position shown in FIG. 29B, the movable operation handle 71 of the operation section 3 is clocked in FIG. Rotate in the direction. In this case, the operation shaft 12 of the treatment section drive unit 9 is pulled toward the operator's side with the rotating operation of the movable operation handle 71, and with the moving operation of the operation shaft 12, the caulking pin 191 of each gripping member 5 is pulled. Then, the proximal ends of both gripping members 5, 5 are pulled toward the proximal side.

At this time, at the same time that the proximal ends of the gripping members 5, 5 move to the proximal side, the gripping members 5, 5 are gripped by the caulking pins 191 and the gripping portions 5a of the gripping members 5 on the tip side. Rotate in the direction of approaching (the two gripping members 5, 5
Is closed) operation is performed. At this time, the movement of both gripping members 5, 5 in the axial direction and the caulking pin 191.
The rotation operation centered on is carried out with the elongated hole 192 moving along the cam pin 193.

Also, the grip portion 5 on the tip side of the grip members 5, 5
After a comes into contact with each other and the gripping members 5 and 5 are closed,
By applying an operating force in the direction of closing the gripping members 5, 5 to the operation portion 3, the gripping members 5, 5 are moved within a range in which the clearance S ₄ on the tip side between the elongated hole 192 and the cam pin 193 is reduced. By the elastic force of 5, the gripping members 5, 5
Can be slightly bent.

Therefore, the following effects can be obtained with the above-mentioned structure. That is, when the gripping members 5 and 5 move in the closing direction, the gripping portion 5a on the tip side of the gripping members 5 and 5 is formed.
The cam pin 193 does not hit the end portion of the elongated hole 192 on the tip end side when they contact each other. Therefore, even after the contact between the gripping portions 5a on the tip ends of the gripping members 5 and 5, it is possible to pull the operation shaft 12 to the proximal side by an extra amount by a distance corresponding to the clearance S ₄ .
The force applied to the movable operation handle 71 can be sufficiently transmitted to the distal end side of the gripping members 5 and 5, and a thin film-like living tissue can be firmly and reliably gripped between the gripping members 5 and 5.

FIG. 30 shows a seventh embodiment of the present invention. In this embodiment, as in the third embodiment shown in FIGS. 17A to 17G, the treatment member 2 for one-sided opening is provided with a fixed gripping member 201 and a movable gripping member 202.
03 is provided. The movable gripping member 20
2, a long hole 204 which is a cam groove of the cam mechanism K is formed,
The cam pin 205 is inserted in the elongated hole 204.

Here, the lower fixed gripping member 201 is formed integrally with the tip cover 21 and does not move. Further, the base end portion of the upper movable gripping member 202 has the operation shaft 12
At the tip of the tip side operation rod 13 in
It is swaged and swiveled.

Further, the long hole 20 of the movable grip member 202
4 has a long hole 20 when the movable grip member 202 is closed.
4 is provided with a clearance S ₅ extending from the elongated hole 204 on the tip side of the cam pin 205. The cam pin 2
Both ends of 05 are two support arms 2 of the tip cover 21.
They are fixed by crimping to the tips of 2, 22 respectively.

Therefore, the following effects are obtained with the above-mentioned structure. That is, when the movable gripping members 202 move in the closing direction, the cam pins 205 make the long holes 2 when the gripping portions on the tip end sides of the gripping members 201 and 202 contact each other.
04 does not hit the end portion on the front end side. for that reason,
Since the operating shaft 12 can be pulled further by the distance corresponding to the clearance S ₅ even after the grip portions on the tip ends of the grip members 201 and 202 are in contact with each other, the movable operation handle 71 can be operated. The applied force can be sufficiently transmitted to the distal end side of the movable gripping member 202, and there is an effect that a thin film-like living tissue can be firmly and reliably gripped between the gripping members 201 and 202.

31 (A) and 31 (B) show an eighth embodiment of the present invention. This is because the cam pins 211 of the cam mechanism K are projectingly provided on both side surfaces of the grip member connecting portion 18 of the W jumper member 16 of the first embodiment, and the cam mechanism K is provided at the tip end portion of the link arm 33 of each grip member 5. The long holes 212, which are cam grooves, are respectively formed. The cam pin 211 of the W jumper member 16 is inserted into the elongated hole 212 of the link arm 33 of each gripping member 5.

Further, the link arm 33 of each gripping member 5
31A from the open position of the grip member 5 in the long hole 212 of FIG.
The long hole 212 is longer than the operation range in which the long hole 212 moves along the cam pin 211 during the movement to the closed position shown in FIG.
The length of the rear end side is set to be long. A clearance S ₆ is formed in the elongated hole 212 so as to extend in the rear end direction from the position of the cam pin 211 when the grip member 5 is closed.

Next, the operation of the above structure will be described.
First, as in the first embodiment, the movable operation handle 71 of the operation portion 3 is opened to operate the operation shaft 12 and the W jumper member 1.
When 6 is moved to the tip side, the cam pin 211 horizontally moves in the elongated hole 212 of the link arm 33 of each grip member 5 in the tip direction, so that both grip members 5 and 5 open around the crimp pin 35. .

When the gripping members 5, 5 of the treatment section 6 are closed from the open position to the closed position shown in FIG. 31A, the movable operation handle 71 of the operation section 3 is rotated in the closing direction. . With this operation, the operating shaft 12 of the treatment section drive unit 9 is pulled toward the operator's side, and the operating shaft 12
Cam pin 21 of the W jumper member 16 in accordance with the moving operation of the
The gripping members 5 and 5 are pulled by 1, and the proximal ends of the gripping members 5 and 5 are pulled toward the proximal side.

Further, the forceps teeth 3 on the tip side of the gripping members 5, 5
After the two come into contact with each other and the gripping members 5 and 5 are closed,
In the direction in which the clearance S ₆ on the rear end side between the elongated hole 212 of the link arm 33 of each gripping member 5 and the cam pin 211 is reduced by applying an operating force to the operation portion 3 in the direction of closing the gripping members 5 and 5. Within the range of movement to
The elastic force of 5 allows the gripping members 5, 5 to be slightly bent.

Therefore, the following effects can be obtained with the above-mentioned structure. That is, when the gripping members 5 and 5 move in the closing direction, the forceps teeth 32 on the tip side of the gripping members 5 and 5 are moved.
The cam pins 211 do not hit the terminal end portion on the rear end side of the elongated hole 212 when they contact each other. Therefore, even after the forceps teeth 32 on the distal ends of the two gripping members 5, 5 come into contact with each other, the operating shaft 12 can be pulled to the proximal side by an extra amount by a distance corresponding to the clearance S ₆ .
The force applied to the movable operation handle 71 can be sufficiently transmitted to the distal end side of the gripping members 5 and 5, and a thin film-like living tissue can be firmly and reliably gripped between the gripping members 5 and 5.

32A to 32F show a ninth embodiment of the present invention. This is shown in FIG.
A flat rotation stopping portion 221 is formed by grinding both side surfaces of the W jumper member 16 of the eighth embodiment shown in (B), and the rotation stopping portion 221 is used to support the two support arms 22, 22 of the tip cover 21. It is placed in between.

Therefore, the same effect as that of the eighth embodiment can be obtained with the above structure. Further, in this embodiment, since the flat rotation stopping portion 221 is formed on both side surfaces of the W jumper member 16 and the rotation stopping portion 221 is arranged between the two support arms 22 and 22 of the tip cover 21,
The W jumper member 16 does not rotate around the central axis. Therefore, the cam pin 211 of the W jumper member 16,
Since the operating shaft 12 and the W torque member 16 do not transmit the rotational torque generated in the elongated hole 212 of the link arm 33 of each gripping member 5, the operation shaft 12 and the W torque member 1
The cam pin 211 of the W jumper member 16, the link arm 33 of each gripping member 5, and the like, and the cam pin 211 of the W jumper member 16 are prevented from coming off from the elongated hole 212 of the link arm 33 due to the rotational torque generated in 6. There is an effect that can be done.

33 (A) to 33 (C) show gripping forceps 231 having still another structure. The grasping forceps 231 employs a pantograph type link mechanism 232 instead of the cam mechanism K as the opening / closing drive mechanism 8 for driving the grasping members 5 and 5 in the treatment section drive unit 9 of the first embodiment to open and close.

In this link mechanism 232, as shown in FIG. 33 (E), the proximal ends of the pair of link arms 233 and 233 are rotatably caulked and fixed to the distal end of the W jumper member 16 via caulking pins 234. ing. Each link arm 2
As shown in FIG. 33 (D), the tip portion of 33 has each gripping member 5
The caulking pins 23 are respectively provided on the base ends of the link arms 33 of
It is rotatably caulked and fixed via 5.

Further, as shown in FIG. 33 (F), flat rotation stopping portions 236 are formed by cutting on both side surfaces of the W jumper member 16, and the rotation stopping portions 236 are formed on the front cover 21. It is arranged between the support arms 22, 22. The configuration of the parts other than the above-mentioned parts is the same as that of the first embodiment, and the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Therefore, in the structure described above, the link mechanism 232 is driven via the W joint member 16 in accordance with the movement of the operation shaft 12 to open / close both gripping members 5, 5. Here, since the rotation stopping portions 236 and 236 are arranged inside the two support arms 22 and 22 of the tip cover 21, when the opening and closing operations of both gripping members 5 and 5 are performed, W
The jumper member 16 does not rotate around the central axis.
Therefore, the rotational torque generated in the operation shaft 12 and the W jumper member 16 is caused by the caulking pin 234 and each link arm 23.
3 and the link arm 33 of each gripping member 5, the caulking pin 234, the link arm 233, and the link arm of the gripping member 5 due to the rotational torque generated in the operating shaft 12 and the W jumper member 16. This has an effect of preventing damage to 33 or the like.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

Next, other characteristic technical matters of the present application will be additionally described as follows.

(Additional Item 1) One of an insertion portion to be inserted into a living body, an operation shaft arranged in the insertion portion, a cam groove and a cam pin engaging with the cam groove is the operation shaft. In the forceps for an endoscope having an opening / closing mechanism for opening / closing the forceps member in response to the forward / backward movement of the cam pin, the length of the cam groove on at least one side when the forceps member is closed or opened is set to the cam pin. A forceps for an endoscope, which is configured to be longer than the sliding range of the forceps.

(Additional Item 2) In an endoscopic forceps having an insertion portion to be inserted into a living body and an opening / closing mechanism provided at the tip of the insertion portion, a grip portion of the forceps tip portion and opening / closing of the grip portion are provided. A forceps for an endoscope, which is provided with a protruding portion protruding in an outer diameter direction between the caulking pin as a rotation center for performing the above.

(Additional Item 3) The forceps for an endoscope according to Additional Item 2, wherein the protruding portion is provided in a portion exposed from the distal end side of the insertion portion.

(Additional Item 4) The projecting portion is configured to be slightly smaller than the outer diameter of the insertion portion when the grip portion of the forceps is closed. The forceps for an endoscope according to appendix 2.

(Additional Item 5) An inner part provided with an insertion part to be inserted into a living body, an operation shaft arranged in the insertion part, and an opening / closing mechanism for opening and closing the forceps member in response to the forward / backward movement of the operation shaft. In the forceps for an endoscope, the strength of one member between the operation shaft and the forceps member is weakened, and the forceps for an endoscope is provided.

(Additional Item 6) The reason why the strength is weakened is that
6. The forceps for an endoscope according to appendix 5, which is in the vicinity of the pin attachment portion of the forceps member.

(Additional Item 7) The reason why the strength is weakened is that
6. The endoscopic forceps according to appendix 5, which has a pin attached to the forceps member or a pin attachment structure.

(Additional Item 8) An internal device comprising an insertion portion to be inserted into a living body, an operation shaft arranged in the insertion portion, and an opening / closing mechanism for opening and closing the forceps member in response to the forward / backward movement of the operation shaft. A forceps for an endoscope, wherein the operation shaft is provided with a rotation stopper.

(Additional Item 9) The forceps for an endoscope according to Additional Item 8, wherein at least one of the sliding portion of the W tie and the arm of the rotation stopper is in flat contact. .

(Additional Item 10) An insertion portion to be inserted into a living body, an operation shaft arranged in the insertion portion, an opening / closing mechanism for opening and closing a forceps member in response to a forward / backward movement of the operation shaft, and the operation described above. In the forceps for an endoscope provided with an operation section for transmitting an advancing / retreating motion to a shaft, a center line of the operation axis and a connection groove of the operation section connected to the operation axis are substantially formed when the forceps are closed. A forceps for an endoscope, which is configured to have a right angle.

(Additional Item 12) An insertion part to be inserted into a living body, forceps provided at the tip of the insertion part, an operation part for operating, a high-frequency current introducing mouthpiece, and the high-frequency current mouthpiece. In a forceps for an endoscope provided with a high-frequency current cable connected to, a high-frequency current introduction base and at least one of the high-frequency current cable connected to the high-frequency current introduction base is an insulating member. A forceps for an endoscope, comprising:

[0211]

According to the present invention, the length of at least one end of the cam groove is longer than the operating range in which the cam pin moves along the cam groove during the operation of moving the treatment member between the open position and the closed position. Since it is set, it is possible to firmly and firmly grasp the thin film tissue in the body cavity, and when performing the peeling operation while grasping the thin film tissue, it is difficult for the thin film tissue to fall off, and the thin film tissue is peeled off The operability of the operation can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of grasping forceps which is a treatment tool for an endoscope according to a first embodiment of the present invention.

2A is a plan view showing a treatment section drive unit, FIG.
(B) is the same side view.

FIG. 3A is a plan view showing a partial cross-section of a main part configuration of a treatment section drive unit, and FIG. 3B is a side view of the same.

4A is a cross-sectional view taken along line L ₁ -L _{1 of} FIG.
(B) is L ₂ -L ₂ line sectional view of FIG. 3 (B), (C) is L ₃ -L ₃ line sectional view of FIG. 3 (B), L ₄ of (D) FIG. 3 (B) -L ₄ cross-sectional view taken along a line, L ₅ -L ₅ of (E) FIG. 3 (B)
Line cross-sectional view, (F) is L ₆ -L ₆ line sectional view of FIG. 3 (B).

5A is a plan view showing a distal end portion of a treatment section drive unit in a partial cross section, FIG. 5B is a side view of the same, and FIG. 5C shows a snap-fit arm of a connection section of the treatment section drive unit. Vertical sectional view.

6A is a sectional view taken along line L ₁ -L _{1 of} FIG. 5B,
(B) is a cross-sectional view showing a connecting portion of the guide pin of the link arm in the treatment member.

FIG. 7A is a vertical cross-sectional view showing the distal end portion of the sheath unit, and FIG. 7B is a side view showing a partial cross-section of the rear end portion of the sheath unit.

8 (A) is a longitudinal sectional view showing a positioning portion of the distal end of the connection pipe of the sheath unit, L ₁ (B) in (A) -
L ₁ line sectional view, (C) is a longitudinal sectional view showing a connecting portion between the connection pipe and the inner pipe of the sheath unit, and (D) is a side view showing a partial snap-fit arm at the rear end of the sheath unit. , (E) is a cross-sectional view taken along line L ₁ -L ₁ of (D).

FIG. 9 (A) is a side view showing a partial cross section of an operation portion, and FIG. 9 (B) is a front view showing a connection groove of a movable operation handle,
(C) is L ₁ -L ₁ line cross-sectional view of (A).

FIG. 10 is a vertical cross-sectional view showing a state in which the sheath unit is connected to the insertion portion connection portion of the fixed handle of the operation portion.

FIG. 11A is a vertical cross-sectional view showing a state in which the projecting portion of the treatment unit drive unit and the distal ends of the projecting portions of the sheath unit abut each other and the two do not engage with each other, and FIG. 11B shows the state of FIG. FIG. 5 is a vertical cross-sectional view showing a state in which the movable operation handle is rotated until it hits the rubber cap.

FIG. 12A is a vertical cross-sectional view showing a state in which the projecting portion of the treatment section drive unit and the projecting portion of the sheath unit are rotated to a regular fitting position, and FIG. 12B shows the state of FIG. FIG.

FIG. 13A is a vertical cross-sectional view showing a state in which the protrusion completely rides over the inward protrusion and enters the storage part, and FIG. 13B is a vertical cross-sectional view showing the operation part in the state of FIG. 13A.

FIG. 14A is a vertical cross-sectional view showing a state in which grasping forceps are inserted into a gap of a living tissue with the grasping member closed.
FIG. 6B is a vertical cross-sectional view showing a connection portion between the treatment section drive unit and the sheath unit in the state of FIG.

15A is a vertical cross-sectional view showing a state in which a gripping member is opened, and FIG. 15B is a vertical cross-sectional view showing a connecting portion between the treatment section drive unit and the sheath unit in the state shown in FIG. 15A.

FIG. 16 shows a second embodiment of the present invention,
(A) is a vertical cross-sectional view showing a schematic configuration of the distal end portion of the grasping forceps, (B) is a vertical cross-sectional view showing a connecting portion between the treatment section drive unit and the sheath unit, (C) is L _1-of (B). L ₁ line sectional view, (D) is L ₂ -L ₂ line cross-sectional view of (B).

FIG. 17 shows a third embodiment of the present invention,
(A) is a vertical cross-sectional view showing a schematic configuration of the distal end portion of the grasping forceps, (B) is a vertical cross-sectional view showing a connecting portion between the treatment section drive unit and the sheath unit, (C) is L _1-of (A). L ₁ line sectional view, (D) is L ₂ -L ₂ line cross-sectional view of (a), (E)
The L ₃ -L ₃ line cross-sectional view of (A), L ₄ of (F) is (A)
-L ₄ line sectional view, (G) is the L ₅ -L ₅ line sectional view of (B).

FIG. 18 (A) is a plan view showing a holding member of a treatment tool according to a fourth embodiment of the present invention, and FIG. 18 (B) is a side view of the holding member.
(C) is a vertical cross-sectional view of the grip member, and (D) is a plan view showing a modified example of the grip member main body of the fourth embodiment.

FIG. 19 (A) is a side view showing a partial cross section of the distal end portion of the sheath unit in the treatment tool of the fourth embodiment of the present invention, and FIG. 19 (B) is a partial cross section of the proximal end portion of the sheath unit. The side view shown in FIG.

FIG. 20 shows a modified example of the sheath unit of the fourth embodiment, (A) is a side view showing a partial cross section of the distal end of the sheath unit, and (B) is a proximal end of the sheath unit. Is a side view showing a part of the cross section, (C) is L of (A)
_1- L ₁ line sectional view, (D) (A) L _2- L ₂ line sectional view, (E) (B) L ₃ -L ₃ line sectional view.

FIG. 21 (A) is a cross-sectional view showing a first modification of the gripping member of the first embodiment, (B) is a plan view of the gripping member of the same modification, and (C) is the first embodiment. The side view which shows the 2nd modification of the holding member of an example.

22A is a vertical cross-sectional view showing a third modification of the holding member of the first embodiment, and FIG. 22B is a plan view showing a snap-fit portion of the modification.

FIG. 23 shows a fifth embodiment of the present invention,
(A) is a side view showing a distal end portion of the sheath unit in a partial cross section, and (B) is a side view showing a proximal end portion of the sheath unit in a partial cross section.

FIG. 24A is a side view showing a schematic sectional view of a distal end portion of the treatment section drive unit of the fifth embodiment,
(B) is a longitudinal sectional view showing the snap-fit portion of the treatment section drive unit, (C) is L ₃ -L ₃ line cross-sectional view of (A).

25A is a sectional view taken along line L ₁ -L ₁ of FIG. 24A, and FIG. 25B is a sectional view taken along line L ₂ -L ₂ of FIG. 24A.

FIG. 26 is a vertical cross-sectional view of a main portion showing a state in which an A-code mouthpiece of A-code is connected to the electrode pin of the grasping forceps of the first embodiment.

FIG. 27 (A) is a longitudinal sectional view of an essential part showing a first modified example of the structure of the connecting portion between the electrode pin of the grasping forceps and the A-code mouthpiece of the A code, and FIG. 27 (B) is the electrode pin of the grasping forceps and A The longitudinal cross-sectional view of the principal part which shows the 2nd modification of the structure of the connection part with the A code mouthpiece of a code.

FIG. 28 (A) is a plan view showing the distal end portion of the grasping forceps of the fifth embodiment of the present invention with a partial cross section, and FIG. 28 (B) shows the distal end portion of the grasping forceps of the same embodiment with a partial cross section. Side view,
(C) is a longitudinal cross-sectional view showing a snap-fit arm of the connection portion of the treatment portion drive unit.

FIG. 29 (A) is a side view showing, in a partially sectioned view, the state in which the distal end portion of the grasping forceps of the sixth embodiment of the present invention is opened.
FIG. 3B is a side view showing a state in which the distal end portion of the grasping forceps is closed in a partial cross section.

FIG. 30 is a vertical cross-sectional view showing the distal end portion of the grasping forceps according to the seventh embodiment of the present invention.

FIG. 31 (A) is a side view showing the distal end portion of the grasping forceps of the eighth embodiment of the present invention, and FIG. 31 (B) is a sectional view taken along line L ₁ -L ₁ of (A).

32A is a side view showing the distal end portion of the grasping forceps of the ninth embodiment of the present invention, FIG. 32B is a sectional view taken along line L ₁ -L _{1 of} FIG. 32A, and FIG. L ₂ -L ₂ cross-sectional view taken along a line).

FIG. 33 (A) is a side view showing a tip portion of another grasping forceps, (B) is a plan view of the grasping forceps, and (C) is an L of (A).
₁ -L ₁ a sectional view taken along a line, (D) is L ₂ -L ₂ line cross-sectional view of (A), (E) is L ₃ -L ₃ line cross-sectional view of (A), of (F) is (A) L ₄ -L ₄ cross-sectional view taken along line.

[Explanation of symbols]

2 ... insertion part, 3 ... operation part, 5 ... gripping member (treatment member),
8 ... Opening / closing drive mechanism (opening / closing drive means), 9 ... Treatment section drive unit, 12 ... Operation shaft, K ... Cam mechanism, 20 ... Pin sliding groove (cam groove), 36 ... Guide pin (cam pin), S ₁ ,
S ₃ , S ₄ , S ₅ , S ₆ ... Clearance.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Sasaki 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Kenichi Kimura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Eiji Murakami 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Koji Iida 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Yasuhiko Kikuchi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Toshiya Sugai 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. A treatment member that can be opened and closed is disposed at a distal end portion of an insertion portion to be inserted into a living body, a proximal side operation portion is connected to a proximal end portion of the insertion portion, and the insertion portion is provided in the insertion portion. The operation shaft of the treatment member is provided so as to be able to move forward and backward, and a cam mechanism that combines a cam groove and a cam pin that engages with the cam groove and moves along the cam groove is provided. In a treatment instrument for an endoscope including an opening / closing drive means that drives the cam mechanism to open / close the treatment member in response to the operation of the operation shaft that moves forward and backward in accordance with the operation of a portion, the treatment member is opened. An endoscope characterized in that the length of at least one end side of the cam groove is set to be longer than the operating range in which the cam pin moves along the cam groove during the operation of moving between the position and the closed position. Treatment tool.