JP2003144451A - Operation instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation instrument prevented from damage while facilitating distribution of a current carrying means such as coaxial cables. SOLUTION: This operation instrument is provided with a pair of mutually opened/closed jaws 4a, 4b; an insertion part 3 for supporting the jaws 4a, 4b; an operating part for opening/closing the jaws 4a, 4b; heating elements 47a, 47b provided at the jaws 4a, 4b and heated by current application; and the flexible coaxial cables 50a, 50b for carrying a current to the heating elements 47a, 47b.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a surgical instrument capable of grasping, coagulating and incising living tissue.

[0002]

2. Description of the Related Art Generally, a pair of grips for gripping a living tissue is provided, and one or both of the grips is provided with a heating element, and the heating element is heated while holding the living tissue to coagulate and coagulate the living tissue. A surgical instrument for cutting a site is known.
This kind of surgical instrument is usually used in various cases such as hemostasis of blood vessels contained in living tissue, lesions on the surface layer of living tissue, cauterization of bleeding points, occlusion of fallopian tubes for contraception, and the like. A surgical instrument is used for the purpose of hemostasis of blood vessels and occlusion of fallopian tubes, and is capable of coagulating the living tissue to be treated by the patient, and is also capable of incising the coagulated living tissue. ing.

For example, USP 5,514,134
A bipolar forceps for a rapa that opens and closes a jaw by a link mechanism is disclosed. Since two poles are energized to open and close the jaws, the jaws are configured to be energized via a drive shaft or a link mechanism.

US Pat. No. 5,797,939 discloses scissors forceps with a channel, which is used for water supply / suction.

Further, Japanese Patent Application No. 2000-330,709 has a pair of openable and closable gripping parts for gripping tissue,
It is disclosed that at least one of the grip portions is provided with a heat generating portion, and the heat generating portion is provided with independently controllable heat generating means.

[0006]

However, the above-mentioned USPs 5,514,134 are designed to be energized via the drive shaft and the link mechanism, and therefore have an insulating structure in order to energize while insulating the two poles. It gets complicated. Also, US
P5,797,939 discloses scissors forceps with a channel, but does not disclose an energizing means.

Further, Japanese Patent Application No. 2000-330,709 is one in which a scissor constituting member is provided with a concave groove extending in the longitudinal direction thereof, and a lead wire is inserted into the concave groove. Therefore, it is structurally complicated and cannot be used in a surgical instrument for endoscopic surgery having an elongated insertion portion.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the assembling workability by a simple structure of the energizing means for energizing the heat generating means provided in the jaw. It is to provide a surgical instrument capable of achieving the above.

[0009]

In order to achieve the above object, the present invention provides a pair of jaws, at least one of which is movable, a pair of jaws which are opened and closed, an insertion portion which supports the jaws, and the jaws. The surgical instrument includes: an operating unit for opening and closing; a heating unit provided in the jaw for generating heat by energizing; and an energizing unit for energizing the heating unit.

According to a second aspect of the present invention, a pair of jaws that are opened and closed with each other and at least a part of which are curved, an insertion portion that supports the jaws, and an operation portion that opens and closes the jaws are provided.
In a surgical instrument that is provided in the jaw and generates heat by energization, and a surgical instrument that heats the thermal section to treat tissue,
At least a part of the heat generating portion is curved according to the curved shape of the jaw.

According to the above construction, the current-carrying means can be easily inserted even for endoscopic surgery in which the distal end portion of the elongated insertion portion is provided with a jaw.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment, and FIG.
(A) is a side view of a thermocoagulation incision forceps for endoscopic surgery as a surgical instrument, (b) is a side view with a forceps unit removed, and FIG. 2 (a) is a side view of the thermocoagulation incision forceps. ,
(B) Vertical side view of the handle overload limiting mechanism, (c) Y
It is sectional drawing which follows the -Y line.

As shown in FIG. 1, the thermocoagulation incision forceps 1 is
Operation part 2 and elongated insertion part 3 provided in this operation part 2
And a pair of first and second jaws 4a and 4b that are provided at the tip of the insertion portion 3 and that open and close to each other.

The operating section 2 includes an operating section body 5, a fixed handle 6 integrally provided with the operating section body 5, and an operating section body 5.
And a movable handle 8 rotatably provided about a pivot shaft 7 as a fulcrum. A forceps unit 10 is detachably provided on the operation portion main body 5 by the rotation operation portion 9 so that the insertion portion 3 can rotate about the axis.

The insertion portion 3 is formed by a small-diameter pipe 3a, and a drive shaft 11 which is axially movable back and forth is inserted inside the insertion portion 3. The base end portion of the drive shaft 11 is connected to the movable handle 8, and when the movable handle 8 is rotated in the direction of arrow a, the drive shaft 11 moves forward and the first and second jaws 4 move.
When a and 4b open and rotate in the direction of arrow b, the drive shaft 11
Is retracted to close the first and second jaws 4a and 4b. Reference numeral 5a is a stopper that regulates the amount of rotation of the movable handle 8.

Further, an engaging portion 12 formed of a notch is provided on the base end side of the drive shaft 11, and a plurality of electrodes 13 spaced apart in the axial direction are further provided at the base end by the engaging portion 12. A plug 14 is provided.

As shown in FIG. 2, bifurcated support pieces 15 are provided above the pivot shaft 7 of the movable handle 8, and a slide member 16 is connected between the support pieces 15 by a support pin 17. ing. The slide member 16 has a cylindrical shape, and a spring support member 18 is axially slidably inserted therein. A through hole 19 is provided in the spring support member 18 in the axial direction.
The base end side of the drive shaft 11 is inserted through 9.

A lock pin 20 is provided on the tip end side of the spring support member 18 for contacting the end surface of the slide member 16, and a spring stop member 21 is screwed on the base end side. Then, the slide member 16 and the spring stopper member 2
The coil spring 22 is interposed between the spring support member 18 and the coil spring 1 in the state of being fitted to the spring support member 18.

Therefore, when the movable handle 8 is rotated in the direction of arrow a, the drive shaft 11 moves forward and the first and second jaws 4 move.
a and 4b open. When the movable handle 8 is rotated in the direction of the arrow b, the drive shaft 11 retracts to move the first and second jaws 4a,
4b closes. However, when the operator further rotates the movable handle 8 in the direction of the arrow b, the support piece 1 of the movable handle 8 is rotated.
5, the slide member 16 is connected to the spring support member 18
Of the coil spring 22 and the coil spring 22 is compressed. Therefore, even if an overload is applied to the movable handle 8, the load does not act on the first and second jaws 4a and 4b, and the coil spring 22 compresses to limit the overload. It is possible to prevent damage to the jaws 4a, 4b and the drive system transmitted to the jaws.

Further, the spring supporting member 18 is provided with a lock hole 23 in a direction orthogonal to the through hole 19, and the lock hole 23 has a detachable button 24 biased in a protruding direction.
Therefore, the lock member 25 which can move back and forth is inserted.
The lock member 25 is provided with a lock hole 26 that can be engaged with and disengaged from the engaging portion 12 of the drive shaft 11.

Therefore, normally, the lock member 25 is pulled up by the urging force of the attachment / detachment button 24, and the lock hole 26
The engaging portion 12 is engaged with the engaging portion 12, but when the attachment / detachment button 24 is pushed down, the engagement between the lock hole 26 and the engaging portion 12 is released, and the drive shaft 11 can be pulled out from the spring supporting member 18. It is like this.

A cable connector 27 is detachably connected to the plug 14, and the cable connector 27 is connected to a power supply device (not shown) via a cable 28.

FIG. 3 is a vertical sectional plan view showing the tip of the insertion portion of the surgical instrument, and FIG. 4 shows the tip of the insertion portion of the surgical instrument.
(A) is a vertical side view with the jaws closed, (b) is a vertical side view with the jaws open, and FIG. 5 (a) is A in FIG.
-A sectional view taken along the line A, (b) a sectional view taken along the line BB of Fig. 4, a sectional view taken along the line CC of Fig. 4, (d) a D of Fig. 4.
-D is a sectional view taken along the line, (e) is a sectional view taken along the line EE of FIG. 4, and (f) is a sectional view taken along the line FF of FIG.

As shown in FIGS. 3 to 5, a channel pipe 30 and a drive shaft channel 31 are provided in parallel with each other in the small-diameter pipe 3a constituting the insertion portion 3. The channel pipe 30 is provided with an insertion space 32 through which a coaxial cable, which will be described later, is inserted, and the drive shaft 11 is inserted into the drive shaft channel 31 so as to be movable back and forth.

A support member 33 is provided at the tip of the insertion portion 3 so as to project forward, and the support member root portion 33a is fixed to the tip of the small diameter pipe 3a. A pivot pin 34 extends laterally through the tip of the support member 33, and the second jaw 4b is rotatably pivoted to the pivot pin 34. The base end arm portion 35 of the first jaw 4a is formed in a bifurcated shape, and the bifurcated portion is connected to the drive shaft 11 via the connecting pin 36.
Is rotatably connected to. Also, the second jaw 4b
The base end arm portion 37 is formed in a bifurcated shape, and the bifurcated portion is rotatably connected to the base end arm portion 35 of the first jaw 4a by a connecting pin 38. Therefore, the proximal arm portion 37 of the second jaw 4b is formed with a bifurcated coaxial cable insertion space 37a, which will be described later.

Therefore, when the drive shaft 11 moves forward, the first jaw 4a pivots upward with the connecting pin 38 as a fulcrum, and the second jaw 4b pivots downward with the pivot pin 34 as a fulcrum. And the second jaws 4a and 4b open, and conversely, when the drive shaft 11 retracts, the first jaw 4a pivots downward with the connection pin 38 as a fulcrum, and the second jaw 4b fulcrum with the pivot pin 34 as a fulcrum. Pivots upwards as the first and second jaws 4
A and 4b are closed.

The first and second jaws 4a and 4b are
When viewed in a plan view, the distal end portion is curved to the left, so that the tissue is easily separated. Further, a thin plate-shaped heat generating plate 40 of copper or the like having excellent thermal conductivity is provided on the gripping surface of the first jaw 4a, that is, the contact surface side with the living tissue, and the gripping surface of the second jaw 4b is provided. A flexible member 41 is provided. The heat generating plate 40 and the flexible member 41 are curved according to the curved shapes of the first and second jaws 4a and 4b. Heating plate 4
A cavity is provided in the first jaw 4a on both sides of 0, and the cavity 39 is filled with a filler 39 such as a heat insulating material.

The heat generating plate 40 is a rectangular metal plate arranged along the longitudinal direction of the first jaw 4a, and a blade portion 42 having a taper on its lower side so as to become thinner toward the tip. Are provided over the longitudinal direction.

A plurality of, in the present embodiment, three projecting pieces 43a, 43b, 43c are provided on the upper side of the heat generating plate 40 at predetermined intervals in the longitudinal direction so as to project upward. These projecting pieces 43a, 43b, 43c are provided with slits in the vertical direction, and the thermal coupling portion 4 is formed by these slits.
4 are formed.

The projecting piece 43a located on the tip side of the first jaw 4a is provided with a through hole 45 penetrating in the lateral direction.
The fixing plate 4 protruding upward from the other protruding pieces 43a and 43b is provided on the protruding piece 43c located on the base end side of the first jaw 4a.
6 are integrally provided.

Heat generating elements 47a, 47b such as thin film heating resistance elements as heat generating means are partially inserted in the slits in the respective heat coupling portions 44 between the projecting pieces 43a, 43b, 43c. Heat-bonded and fixed. The heating elements 47a and 47b are installed at equal intervals so that the temperature distribution becomes uniform.

Both ends of a fixing pin 48 provided laterally through the through hole 45 are fixed on the tip side of the first jaw 4a, and the fixing plate 46 is fixed on the base end side.
Are fixed by fixing pins 49.

Coaxial cables 50a and 50b are independently connected to the heating elements 47a and 47b. These coaxial cables 50a and 50b pass through a coaxial cable insertion space 37a, which will be described later, in the base end arm portion 37 of the second jaw 4b, and are inserted into the insertion space 32 in the insertion portion 3. The coaxial cables 50a and 50b are connected to the electrode 13. Further, the insertion space 32 in the insertion portion 3 is filled with the filling material 51, and the coaxial cable 5
0a and 50b are held.

Next, the operation of the thermocoagulation / dissection forceps 1 configured as described above will be described.

First, the first and second jaws 4a and 4b are closed and inserted into a living tissue including a treated portion such as a blood vessel (not shown). Thereafter, when the movable handle 8 of the operating portion 2 is rotated in the direction of arrow a with the pivot shaft 7 as a fulcrum, the drive shaft 11
Moves forward. As the drive shaft 11 advances, the first jaw 4a pivots upward with the connecting pin 38 as a fulcrum, and the second jaw 4b pivots downward with the pivot pin 34 as a fulcrum. The jaws 4a, 4b are opened, and the treated portion such as a blood vessel can be peeled off and exposed from other living tissues.

Subsequently, the separated blood vessel or the like is positioned between the first and second jaws 4a and 4b, and the movable handle 8 of the operating portion 2 is rotated in the direction of the arrow b with the pivot shaft 7 as the fulcrum to drive. The shaft 11 retracts. As the drive shaft 11 retracts, the first jaw 4a rotates downward about the connecting pin 38 as a fulcrum,
The second jaw 4b pivots upward about the pivot pin 34 as a fulcrum, the first and second jaws 4a and 4b are closed, and the second jaw 4b is grasped in a compressed state with a relatively small appropriate pressure suitable for coagulation treatment. .

In this state, the connector 27 and the coaxial cables 50a, 5a and 5 are connected from the power supply unit through the connector cable 28.
A current is applied to the heating elements 47a, 47b provided on the heating plate 40 of the first jaw 4a via 0b. Due to the electric resistance during the energization, the heating elements 47a and 47b generate heat, and the living tissue of the treated portion such as the blood vessel which is in contact with the surface of the heating plate 40 is coagulated / dissected.

At this time, the first jaw 4a is provided with two heating elements 47a, 47b, and each heating element 47a, 47b.
Coaxial cables 50a and 50b are independently connected to b and connected to the power supply device. Therefore, each heating element 47
It is possible to control a and 47b independently to the set heat generation temperature.

That is, when the amount of heat generated at the portion of the heat generating plate 40 that is in contact with the living tissue, for example, the tip side of the heat generating plate 40 decreases and the temperature decreases, the resistance value of the heat generating element 47a on the tip side is changed. A control for detecting and increasing the output to the heating element 47a is performed, and a portion not in contact with a living tissue, for example, the heating plate 4
When the heat generation amount on the base end side of 0 increases, the heat generating element 4 on the base end side
Control for reducing the output of 7b can be performed, and as a result, temperature unevenness of the heat generating plate 40 can be prevented and solidification and incision can be performed quickly and reliably.

The heat generating plate 40 is curved following the curved shape of the first jaw 4a. Therefore, when the straight heating plate 40 is to be assembled into the curved first jaw 4a, the first jaw 4a becomes wider in the width direction and becomes thicker as a whole, but the heating plate 40 is Since it is curved following the curved shape of the jaw 4a, it can be made thin as a whole.

The heat generating plate 40 is preferably made of a material having good thermal conductivity such as copper, silver and tungsten.
7b may be a thin film resistance heating element, a ceramic heater, a cartridge heater, a PTC heater, or the like.

Further, to give an example of the material of the flexible member 41,
There are rubber (silicon rubber, fluororubber, ethylene propylene rubber, butyl rubber, etc.) and gel (silicon-based α gel etc.) Teflon (registered trademark).

FIG. 6 shows a second embodiment, (a) is a vertical side view with the jaw closed, and (b) is a vertical side view with the jaw open. The same components are given the same numbers and their explanations are omitted.

As shown in FIG. 6, heating elements 47a, 47b.
The coaxial cables 50a, 50b for energizing the pipes are inserted into the hard pipes 60a, 60b,
0b is connected by a bendable connecting member 61. As the material of the connecting member 61, a resin such as rubber or Teflon (registered trademark), such as fluororesin or silicone rubber,
Alternatively, a coil-shaped metal spring or a composite material in which rubber / resin and a coil spring are superposed may be used. Coaxial cable 5
If the outer diameters of 0a and 50b are as small as possible compared to the inner diameters of the pipes 60a and 60b, the bent portion 63 is less likely to be damaged. The energizing means is the coaxial cables 50a, 50.
The cable is not limited to b and may be a single wire cable.

The front end portion of the pipe 60a has a heat generating plate 40.
It is fixed to a part of the heat insulating member 62 provided on the outer side, and the rear end portion of the pipe 60b is fixed to the drive shaft 11.

According to this embodiment, the coaxial cable 50
There is an effect that the fixation of a and 50b becomes more reliable.

FIG. 7 shows a third embodiment, (a) is a vertical side view with the jaw closed, and (b) is a side view with the jaw open, the same as in the first embodiment. The constituent parts are given the same numbers and their explanations are omitted.

As shown in FIG. 7, a fixed jaw 4a is provided at the tip of the insertion portion 3, and a movable jaw 4b is supported by the fixed jaw 4a so as to be openable and closable. The stationary jaw 4a is provided with a heat generating plate 40, and the movable jaw 4b is provided with a flexible member 4a.
1 is provided. Inside the fixed jaw 4a, a coaxial cable 50a for energizing the heating elements 47a, 47b,
A pipe 64 that accommodates 50b therein is provided.

According to the present embodiment, the parts such as the heating element and the energizing means are fixed to the fixed jaws, so that the structure can be simplified. The same effect can be obtained by adopting the above-mentioned configuration for the thermocoagulation forceps or the heat dissection forceps.

8 and 9 show a fourth embodiment of the insertion portion of the surgical instrument, (a) is a vertical plan view taken along the line KK of (b), and (b) is the insertion portion of the surgical instrument. 9A is a vertical cross-sectional side view of the front end portion of FIG. 9, FIG. 9A is a cross-sectional view taken along line AA of FIG.
8B is a sectional view taken along line BB in FIG. 8B, FIG. 8C is a sectional view taken along line CC in FIG. 8B, and FIG.
8B is a sectional view taken along the line D-D, FIG. 8E is a sectional view taken along the line E-E of FIG. 8B, and FIG. 8F is a sectional view taken along the line F-F of FIG. 8B. , (G) is a sectional view taken along the line GG in FIG. 8 (b), (h) is a sectional view taken along the line H-H in FIG. 8 (b),
8 (i) is a sectional view taken along line I-I of FIG. 8 (b), and FIG. 8 (j) is a sectional view taken along line J-J of FIG. 8 (b). The same numbers are assigned and the description is omitted.

As shown in FIGS. 8 and 9, coaxial cables 50a and 50b as current-carrying means are inserted in the resin tube 65. The tip of the resin tube 65 is bonded between the heat insulating members 66 and 67. Further, the outer diameter of the resin tube 65 is larger than the gap between the heat insulating members 66 and 67, and the resin tube 65 is pushed and assembled at the time of assembling, which is a so-called crimped state.

The rear end of the resin tube 65 is adhered to the drive shaft 11. The outer diameters of the coaxial cables 50a and 50b are smaller than the inner diameter of the resin tube 65 so that the bending of the resin tube 65 can be easily followed.
The resin tube 65 may be a heat shrink tube.

Coaxial cables 50a, 5 as energizing means
0b is integrally provided in the drive shaft 11. One of the coaxial cables 50a and 50b is provided on the left side and the other is on the right side with respect to the central axis defining the center of the insertion portion 3. The heat insulating members 66 and 67 are fixed to the one jaw 4a by fixing pins 68 and 49. Furthermore, the heating element 47a,
Heat insulating members 69 and 70 are provided around 47b.

According to the present embodiment, by providing the coaxial cable as the energizing means inside the drive shaft, the drive shaft can be upsized and the strength can be increased. Also, by distributing the coaxial cable to the left and right, there is an effect that the jaw can be downsized.

According to the above embodiment, the following structure can be obtained.

(Supplementary Note 1) A pair of jaws that open and close each other, an insertion portion that supports the jaws, an operation portion that opens and closes the jaws, a heat generating means that is provided in the jaws and generates heat by energizing, and to the heat generating means. A flexible energizing means for energizing the electric power, and a surgical instrument for treating tissue by generating heat from the heat generating means, characterized in that a dedicated space for inserting the energizing means is provided in the insertion portion. .

(Supplementary Note 2) The surgical instrument according to Supplementary Note 1, wherein the dedicated space is a pipe-shaped member provided in the insertion portion.

(Supplementary Note 3) The surgical instrument according to Supplementary Note 1, wherein the energizing means is a coaxial cable.

(Supplementary Note 4) The surgical instrument according to Supplementary Note 2, wherein the exclusive space is filled with a filler.

(Supplementary Note 5) A pair of jaws which are opened and closed with each other and at least a part of which is curved, an insertion portion which supports the jaws, an operation portion which opens and closes the jaws, and heat is generated by energizing the jaws. And a surgical instrument for treating tissue by generating heat from the heating section, wherein at least a part of the heating section is curved according to the curved shape of the jaw.

(Supplementary Note 6) The heat-generating portion is composed of a heat-generating element and a heat-generating plate for conducting heat treatment of the heat-generating element, and at least a part of the heat-generating plate is curved. The surgical instrument according to appendix 5.

(Supplementary Note 7) The surgical instrument according to Supplementary Note 6, wherein the exothermic plate has a curved portion near the tip.

According to Supplementary Notes 1 to 4, since the coaxial cable or the like as the energizing means can be inserted into the dedicated space and can be partitioned from the drive shaft or the like, the coaxial cable and the like can be easily routed and the damage can be prevented. .

According to Supplementary Notes 5 to 7, since the heat generating plate as the heat generating portion is curved in accordance with the curved shape of the jaw, the outer diameter of the treatment portion can be formed thin.

(Supplementary Note 8) A pair of jaws, at least one of which is movable to open and close each other, an insertion portion for supporting the jaws, an operation portion for opening and closing the jaws, and a heat generating means provided in the jaws for generating heat by energization. A surgical instrument comprising: an energizing means for energizing the heat generating means.

(Supplementary Note 9) The surgical instrument according to Supplementary Note 8, wherein the jaw is opened and closed by a link mechanism.

(Supplementary Note 10) The surgical instrument according to Supplementary Note 8, wherein the energizing means has flexibility.

(Supplementary Note 11) The surgical instrument according to Supplementary Note 8, wherein a part of the energizing means is bent.

(Supplementary Note 12) The surgical instrument according to Supplementary Note 8, wherein the energizing means is hard.

(Supplementary note 13) The surgical instrument according to supplementary note 8, wherein a dedicated space for inserting the energizing means is provided in the insertion portion.

(Supplementary Note 14) The energizing means is at least two.
9. The surgical instrument according to appendix 8, wherein one is located on the left side and the other is located on the right side with respect to a central axis that defines the center of the insertion portion.

[0073]

As described above, according to the present invention, the insertion portion is provided with the energizing means for the heat generating means, so that it is easy to install a coaxial cable or the like as the energizing means. At the same time, there is an effect that damage can be prevented.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and FIG.
[FIG. 3] is a side view of a thermocoagulation / incision forceps for endoscopic surgery as a surgical instrument, and (b) is a side view with a forceps unit removed.

FIG. 2 shows the same embodiment, (a) is a side view of a thermocoagulation incision forceps, (b) is a vertical sectional side view of a handle overload limiting mechanism,
(C) Sectional drawing which follows the YY line.

FIG. 3 is a vertical plan view showing a distal end portion of an insertion portion of the surgical instrument of the embodiment.

FIG. 4 shows a distal end portion of an insertion portion of the surgical instrument of the same embodiment, (a) is a vertical cross-sectional side view with a jaw closed, (b).
Is a vertical side view with the jaws open.

5 shows the same embodiment, (a) is a sectional view taken along the line AA of FIG. 4, (b) is a sectional view taken along the line BB of FIG.
4C is a sectional view taken along the line CC of FIG. 4, FIG. 4D is a sectional view taken along the line DD of FIG. 4, and FIG. 4E is a sectional view taken along the line EE of FIG. 4) is a cross-sectional view taken along line FF of FIG. 4.

6A and 6B show a second embodiment of the present invention, in which FIG. 6A is a vertical sectional side view with the jaw closed, and FIG. 6B is a vertical sectional side view with the jaw open.

FIG. 7 shows a third embodiment of the present invention, in which (a) is a vertical cross-sectional side view with the jaw closed and (b) is a side view with the jaw open.

FIG. 8 shows an insertion portion of a surgical instrument according to a fourth embodiment of the present invention, (a) is a vertical plan view taken along line KK of (b),
(B) is a vertical sectional side view.

FIG. 9 shows the same embodiment, (a) of FIG.
A sectional view taken along line A, a sectional view taken along line BB in FIG. 8B, a sectional view taken along line CC in FIG. 8B, and FIG.
8D is a sectional view taken along line D-D in FIG. 8B, FIG. 8E is a sectional view taken along line E-E in FIG. 8B, and FIG.
8B is a sectional view taken along line FF, FIG. 8G is a sectional view taken along line GG in FIG. 8B, and FIG. 8H is a sectional view taken along line HH in FIG. 8B. , (I) is a sectional view taken along the line I-I of FIG. 8 (b), and (j) is a sectional view taken along the line JJ of FIG. 8 (b).

[Explanation of symbols]

1. Thermocoagulation incision forceps 2 ... Operation part 3 ... insertion part 4a, 4b ... Joe 40 ... Heating plate 47a, 47b ... Heating element 50a, 50b ... Coaxial cable

Claims (2)

[Claims] 1. A pair of jaws, at least one of which is movable and which opens and closes with each other, an insertion portion which supports the jaws, an operation portion which opens and closes the jaws, and a heat generating means which is provided in the jaws and generates heat when energized. A surgical instrument having an energizing means for energizing a heat generating means. 2. A pair of jaws which are opened and closed with each other and at least a part of which is curved, an insertion portion which supports the jaws, an operation portion which opens and closes the jaws, and heat generated by the energization to generate heat. And a surgical instrument for treating tissue by generating heat from the heat generating portion, wherein at least a part of the heat generating portion is curved according to the curved shape of the jaw.