WO2018062415A1 - Endoscopic treatment tool and production method for endoscopic treatment tool - Google Patents

Abstract

An endoscopic treatment tool 1 that comprises: a metal operation wire 22; a snare 23 that is formed by bundling end parts of a metal wire; and a connection part 24 that has the same outer diameter as the operation wire 22 and is formed by twisting together a plurality of metal wires that constitute a base end part 234 of the snare 23. An end surface of the operation wire 22 abuts and is joined by upset resistance welding to an end surface of the connection part 24.

Description

Treatment tool for endoscope and method of manufacturing treatment tool for endoscope

The present invention relates to a treatment tool for endoscope and a method for manufacturing a treatment tool for endoscope.

Conventionally, as a treatment tool used in medical endoscopes, it is inserted into the lumen from the distal end of the endoscope insertion portion, and the internal tissues such as polyps are bound by excision with a snare which is a loop-like wire The treatment tool to do is known (for example, refer to patent documents 1). In such a treatment tool, it is general to use a high frequency snare (hot snare) which cauterizes and excises the tied internal tissues by supplying a high frequency current to the snare.

In high-frequency snares, ablation is performed while cauterizing the body tissue while performing thermal coagulation (hemostasis), so that bleeding during operation can be suppressed, but in some cases, deep bleeding from the deep tissue of the resected site may be accompanied by surgery. Further, in the high frequency snare, preparation for the operation is complicated because preparation of the high frequency power source and attachment of the return electrode plate to the patient are required. In addition, in the case of a high frequency snare, it is necessary to pay attention to burns and the like of the patient and the operator during the operation.

Under such circumstances, in recent years, a method called a cold snare has been widely spread, in which a body tissue is ablated only by binding with a wire without flowing a high frequency current through the snare. Excision of internal tissues with a cold snare is accompanied by bleeding because hemostasis due to heat coagulation can not be expected like high frequency snares, but its influence is limited to the excision site, and therefore the invasiveness is low. In addition, cold snares do not require complicated preoperative preparation as in the case of high frequency snares.

On the other hand, in the case of cold snares, it is essential to use sharp snares in order to remove body tissue with minimal bleeding in the body. In order to form a sharp snare, it is most effective to form a snare using a small diameter wire. This makes it easier for the snare to cut into the body tissue when the body tissue is tied up, and the body tissue can be removed with less bleeding.

Japanese Patent Application Publication No. 2001-218771 Patent No. 5325520

However, if the diameter of the wire forming the snare is reduced, the difference in outer diameter from the operation wire becomes large, which makes it difficult to connect the snare and the operation wire, and various problems may occur. For example, when the snare and the operation wire are brazed through the connecting member, the gap between the connecting member and the snare is large, so air bubbles (voids) and holes (insertion voids) are generated and the brazing material is not sufficiently filled. The bonding strength tends to vary.

In order to solve this problem, for example, as shown in Patent Document 2, it is conceivable to connect the connecting member and the snare by caulking. However, in this case, due to the large gap between the proximal end portion of the snare and the connecting member, the twisted wires constituting the snare may be joined in a state where the snare is broken or twisted. As a result of the twisted wire constituting the snare being untwisted or twisted, the loop does not spread in the same plane when deploying the snare from the distal end of the insertion portion of the treatment tool, making it difficult to hook on body tissue, or snare during tightening. Can easily come off internal tissues, and product performance may be degraded.

Moreover, in patent document 1, 2, in order to connect the proximal end part of a snare, and an operation wire via a connection member, there exists a problem that hard part length becomes long. When the length of the hard part is increased, when inserting the endoscope treatment tool into the body through the treatment channel of the endoscope, an increase in the amount of insertion force and catching in the treatment channel are likely to occur. There was a risk that the operability of the

The present invention has been made in view of the above, and it is possible to join operation wires and wire treatment tools having a large difference in outer diameter without causing variations in joint strength or deterioration of product performance, and additionally, conventionally It is an object of the present invention to provide a method of manufacturing a treatment tool for an endoscope which can significantly reduce the length of the rigid portion and a treatment tool for an endoscope manufactured thereby.

In order to solve the problems described above and to achieve the object, a treatment tool for an endoscope according to the present invention comprises: a metal operation wire; a wire treatment tool formed by bundling the end portions of the metal wire; A connecting portion formed by twisting a plurality of metal wires constituting the proximal end portion of the wire treatment tool and having an outer diameter equal to the outer diameter of the operating wire; The end faces of the parts are characterized in that they are joined by upset resistance welding in a state where they are butted to each other.

The endoscope treatment tool according to the present invention is characterized in that, in the above invention, the wire treatment tool is a loop snare.

In order to solve the problems described above and to achieve the object, a method of manufacturing a treatment tool for an endoscope according to the present invention is a wire treatment tool formed by bundling an operation wire made of metal and an end portion of the metal wire And a connecting portion having an outer diameter equal to the outer diameter of the operation wire, in the method of manufacturing a treatment tool for an endoscope, the plurality of metal wires constituting the proximal end portion of the wire treatment device being the operation The upset resistance welding is performed in a state where the end of the operation wire and the end face of the connection part are butted against each other, and the end of the operation wire and the end face of the connection part are abutted with each other. And welding.

Further, the method for manufacturing a treatment tool for an endoscope according to the present invention further includes, in the above-mentioned invention, a detent step of melting and cutting the connection portion at a predetermined position between the twisting step and the welding step. It is characterized by

In the method for manufacturing a treatment tool for an endoscope according to the present invention, in the above-mentioned invention, after cutting the connecting portion at a predetermined position between the twisting step and the welding step, the welding is performed by arc welding. The method may further include a detent step of melting the cut portion of the connection portion.

According to the present invention, the proximal end portion of the wire treatment tool is twisted to form a connection portion, and the operation wire and the wire treatment device are joined via the connection portion, leading to variations in bonding strength and a decrease in product performance. Therefore, the operation wire and the wire treatment tool having a large difference in outer diameter can be joined. Further, since the operation wire and the wire treatment tool are joined without using the connecting member, the length of the hard portion can be significantly shortened as compared with the conventional case, and the degree of freedom in product design is expanded.

FIG. 1 is a view showing a configuration of an endoscope including a treatment tool for an endoscope according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of the operation part and the insertion part in the endoscopic treatment tool according to the embodiment of the present invention. FIG. 3 is a view showing the configuration of the insertion portion in the endoscopic treatment tool according to the embodiment of the present invention. FIG. 4 is a flowchart showing an example of a method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 5 is a view showing a twisting step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 6 is a view showing a twisting step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 7 is a view showing a twisting step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 8 is a view showing a welding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 9 is a view showing a welding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 10 is a view showing a polishing step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 11 is a view showing the unfolding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 12 is a view showing the unfolding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 13 is a view showing a state in which the end surface of the distal end portion of the operation wire and the end surface of the connecting portion are abutted after the unfolding stop step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention It is. FIG. 14 is a view showing the unfolding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 15 is a view showing the unfolding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 16 is a view showing the unfolding step in the method of manufacturing the endoscopic treatment tool according to the embodiment of the present invention. FIG. 17 is a view showing a modified example of the wire treatment tool in the endoscope treatment tool according to the embodiment of the present invention. FIG. 18 is a view showing a modified example of the wire treatment tool in the endoscope treatment tool according to the embodiment of the present invention. FIG. 19 is a view showing a modified example of the wire treatment tool in the endoscope treatment tool according to the embodiment of the present invention.

Hereinafter, a treatment tool for an endoscope and a method of manufacturing the treatment tool for an endoscope according to the embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and the constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same. In each drawing referred to in the following, the same parts are indicated by the same reference numerals.

[Treatment tool for endoscope]
The configuration of the endoscope treatment tool according to the present embodiment will be described with reference to FIGS. 1 to 3. The endoscope treatment tool 1 constitutes a part of the endoscope 100 as shown in FIG. 1, and is specifically used in a cold snare system. The endoscope treatment tool 1 includes an operation unit 10 and an insertion unit 20 provided on the distal end side of the operation unit 10.

The operation unit 10 is for operating the snare 23 provided on the distal end side of the insertion unit 20. Specifically, as shown in FIG. 2, the operation unit 10 includes a main body portion 11, a connection cap 12, a fold prevention portion 13, a slider 14, and a stopper pipe 15.

The main body portion 11 is formed in an elongated cylindrical shape. Inside the main body portion 11, a guide groove 11a is formed along the direction of the axis (see the dashed line in FIG. 2). The guide groove 11a accommodates the projection 143 of the slider 14 and the operation wire 22 connected to the projection 143, as described later.

On the proximal end side of the main body portion 11, a ring portion 111 for a user who manipulates the endoscope 100 to insert and hook a thumb is formed. In addition, a connection cap 12 is fixed to the tip end side of the main body portion 11. The main body 11 and the connection cap 12 are made of a synthetic resin material (for example, an ABS resin) which can be freely processed into a desired shape at low cost.

The connection cap 12 is connected to a proximal end portion 131 of the fold prevention portion 13 and a proximal end portion 211 of the flexible sheath 21 described later. The anti-folding portion 13 is formed in an elongated cylindrical shape, and is made of a flexible material (for example, a fluorine resin such as Teflon (registered trademark) resin, polyethylene, etc.) like the flexible sheath 21 described later. It is configured.

The slider 14 is attached to the main body 11 and is configured to be movable back and forth along the axial direction. The slider 14 includes a pair of ring portions 141 and 142 for the user to insert and hook two fingers other than the thumb. The ring portions 141 and 142 are provided at positions on both sides of the main body portion 11, that is, in symmetrical positions with respect to the axial direction.

Further, the slider 14 is provided with a projection 143 which is inserted into the guide groove 11 a of the main body 11. An engaging member 144 is embedded in the projection 143, and a proximal end 221 of an operation wire 22 described later is engaged with the engaging member 144. Thereby, the operation wire 22 advances and retracts in conjunction with the advancing and retracting operation of the slider 14.

That is, when the slider 14 is operated to slide to the base end side (ring portion 111 side), the pair of loop portions 231, 232 (see FIG. 3) of the snare 23 are linearly extended, and the flexible sheath 21 is It is drawn in and accommodated. On the other hand, when the slider 14 is operated to slide to the tip side (the connection cap 12 side), the snare 23 is protruded to the outside of the flexible sheath 21 and the pair of loop portions 231 and 232 (see FIG. 3) of the snare 23 are looped. Expand into a shape.

The stopper pipe 15 is formed in an elongated cylindrical shape, and is disposed so as to cover a part of the operation wire 22. The stopper pipe 15 restricts the drawing-in position of the operation wire 22 by coming into contact with the projection 143 when the slider 14 is slid to the base end side (ring portion 111 side). The stopper pipe 15 is made of, for example, a conductive material such as a stainless steel pipe material.

As shown in FIG. 1, the insertion portion 20 is inserted in a treatment channel 102 formed in the insertion portion 101 of the endoscope 100 so as to be able to move forward and backward, and is inserted into the body via the treatment channel 102. . Specifically, as shown in FIG. 3, the insertion portion 20 includes a flexible sheath 21, an operation wire 22, a snare 23, and a connection portion 24.

The flexible sheath 21 constitutes an outer cover of the insertion portion 20, and accommodates the operation wire 22, the snare 23, and the connection portion 24 in a retractable manner. The flexible sheath 21 has a small friction and an excellent ability to transmit force, in order to improve the insertion of the endoscope 100 into the treatment instrument channel 102 and the operability of the operation wire 22 advancing and retracting the inside. It is desirable to be made of a material having rigidity, and it is made of, for example, a fluorine-based resin such as Teflon (registered trademark) resin or polyethylene.

The distal end of the flexible sheath 21 is inclined at an angle of 45 ° with respect to the axial direction. As a result, the flexible sheath 21 can be prevented from collapsing when the body tissue is bound by the snare 23.

The operation wire 22 is accommodated inside the flexible sheath 21. The operation wire 22 is made of a large diameter metal wire excellent in operability, and is formed of, for example, a stranded wire of a metal wire such as stainless steel SUS304.

It is desirable that the metal wire that constitutes the operation wire 22 have a force transmission that can reliably deploy the snare 23 from the flexible sheath 21 under any circumstances. Further, the metal wire that constitutes the operation wire 22 is also in a situation that is disadvantageous for the deployment of the snare 23, as in the case where the snare 23 is located at the curved portion of the insertion portion 101 of the endoscope 100, for example. It is desirable that the snare 23 has a force transferability that enables the snare 23 to be deployed from the distal end of the flexible sheath 21 with certainty.

The end surface 223 of the distal end portion 222 of the operation wire 22 and the end surface 242 of the connection portion 24 are joined together by upset resistance welding. The details of upset resistance welding will be described later.

The snare (wire treatment tool) 23 is formed by bundling the end portions of a thin metal wire excellent in excision, and, like the operation wire 22, for example, by a stranded wire of a metal wire such as stainless steel SUS304. It is configured.

Specifically, the snare 23 includes a pair of elliptical loop portions 231 and 232, and an end portion 233 formed by bending a metal wire in a U shape at one end of the loop portions 231 and 232, And 24.

The connecting portion 24 is joined to the distal end portion 222 of the operation wire 22 via the welding portion 25. The connection portion 24 is formed by twisting a plurality of metal wires constituting the proximal end 234 of the snare 23, as shown in FIGS. 5 and 6 described later. The connecting portion 24 has an outer diameter substantially equal to the outer diameter of the distal end portion 222 of the operation wire 22.

The welding portion 25 is formed when the distal end portion 222 of the operation wire 22 and the connection portion 24 are joined by upset resistance welding as described later, and the metal wire constituting the operation wire 22 and the connection portion 24 are It is comprised from the metal structure which the metal wire to comprise mixed.

[Method of manufacturing treatment tool for endoscope]
A method of manufacturing the endoscope treatment tool 1 according to the present embodiment will be described with reference to FIGS. 4 to 16. In the method of manufacturing the endoscopic treatment tool 1, as shown in FIG. 4, a twisting step (step S 1) of twisting the proximal end 234 of the snare 23 to form the connecting portion 24, and the operation wire 22 A welding step (step S2) of joining the connecting portion 24 by upset resistance welding is performed in this order. The details of each step will be described below.

<Twisting step>
In this step, a plurality of metal wires constituting the proximal end 234 of the snare 23 are twisted so as to be substantially equal to the outer diameter of the distal end 222 of the operation wire 22 to form the connecting part 24. Specifically, as shown in FIG. 5, the chuck 31 sandwiches from the vicinity of the start end 234a of the proximal end 234 of the snare 23 where the metal wires are arranged in parallel to the vicinity of the end of the loop portions 231 and 232. Fix it. Subsequently, the vicinity of the end 234 b of the base end 234 of the snare 23 is sandwiched and fixed by the chuck 32.

Subsequently, as shown in FIG. 6, the coupling portion 24 is formed by rotating the chuck 32 about the axis and twisting so that two metal wires constituting the proximal end portion 234 become one. Subsequently, as shown in FIG. 7, the formed connection portion 24 is cut into a predetermined length by a cutting tool (nipper or the like) to form an end surface 242.

The outer diameter of the proximal end 234 of the snare 23 shown in FIG. 5 is smaller than the outer diameter of the distal end 222 of the operation wire 22. For example, the outer diameter of the metal wire constituting the snare 23 Assuming that r is the outer diameter of the metal wire constituting the operation wire 22 is R, the outer diameter r of the metal wire constituting the snare 23 is 1/2 or less of the outer diameter R of the metal wire constituting the operation wire 22. It is desirable that (0 <r ≦ R / 2), and 1/3 or less (0 <r ≦ R / 3) is more preferable because excisability of internal tissues is improved.

As described above, although the proximal end 234 of the snare 23 and the distal end 222 of the operation wire 22 originally have a large difference in outer diameter, by performing the above-described twisting step, the snare 23 is obtained. The proximal end 234 is processed into the connecting portion 24 having the same outer diameter as the distal end 222 of the operation wire 22.

<Welding step>
In this step, as shown in FIGS. 8 and 9, the end surface 223 of the distal end portion 222 of the operation wire 22 and the end surface 242 of the connection portion 24 are joined by upset resistance welding in a state where they abut each other.

Specifically, as shown in FIG. 8, first, the connecting portion 24 is attached to the stationary chuck 41 of the upset resistance welding device 40. At this time, positioning is performed so that the end surface 242 of the connecting portion 24 is positioned at the center of the gap between the fixed chuck 41 and the movable chuck 42. The size d ₁ of the gap between the fixed-side chuck 41 and the moving-side chuck 42 is almost equal to the outer diameter of the generally bonded members is a measure.

Subsequently, the end surface 223 of the operation wire 22 is abutted against the end surface 242 of the connection portion 24 and fixed to the moving chuck 42. At that time, if there is a gap between the end face 223 of the operation wire 22 and the end face 242 of the connecting portion 24, there is a possibility that arc discharge may occur at the time of upset resistance welding. Therefore, it is desirable that the end surface 223 of the operation wire 22 and the end surface 242 of the connection portion 24 be in close contact with each other without a gap and be abutted. For example, before performing this step, each end surface 223, 242 It is desirable to finish it at right angles.

Further, for example, when the operation wire 22 is easily broken, the operation wire 22 may be melted or cut off and welded to the operation wire 22, and then a right angle finish with a file, a grinder or the like may be performed.

Subsequently, when the upset resistance welding apparatus 40 is activated, the stopper (not shown) of the movable chuck 42 is released, the movable chuck 42 is pressed by the pressure spring 43, and the end surface 223 of the operation wire 22 is The end face 242 is pressurized with a predetermined force. Then, a predetermined current is applied to the fixed chuck 41 and the movable chuck 42, and the member to be joined between the fixed chuck 41 and the movable chuck 42, that is, the end surface 223 of the operation wire 22 and the end surface 242 of the connecting portion 24. The metal structure around the butting part A is heated by resistance (Joule) and melted.

Then, the molten metal structure is set up by the upset pressure (set-up pressure), and as shown in FIG. 9, the operation wire 22 and the connecting portion 24 set up while extruding the molten excess metal structure. It is pushed to the center B. Thus, the size of the gap between the fixed-side chuck 41 and the moving-side chuck 42 is reduced from d ₁ to d _2. The moving amount (d ₁ −d ₂ ) of the moving side chuck 42 at that time, that is, the length (quantity) of pushing out the molten metal structure becomes the upset amount (defensing amount).

Subsequently, when the application of the current is stopped, the molten metal structure is cooled, and the distal end portion 222 of the operation wire 22 and the connecting portion 24 are integrally joined. Finally, as shown in FIG. 10, a polishing step is performed to finish the extra metal structure pushed out to the outer periphery with a file, a grinder or the like to complete the bonding.

Here, the upset resistance welding heats the members to be joined by resistance heating (Joule heat), so if the shapes and dimensions of the members to be joined differ greatly, the difference in resistance value causes a large difference in heat generation. It can not be made stable welding. On the other hand, in the method of manufacturing the endoscopic treatment tool 1 according to the present embodiment, the proximal end 234 of the snare 23 is twisted, and a connecting portion having an outer diameter substantially equal to the outer diameter of the distal end 222 of the operation wire 22. By forming 24, the difference in outer diameter between the operation wire 22 and the proximal end 234 of the snare 23 is compensated. Therefore, the difference in cross-sectional area between the members to be joined becomes smaller, and the amount of heat generated between the members to be joined becomes equal, so stable welding becomes possible.

<Dissolving step>
In the method of manufacturing the endoscope treatment tool 1 according to the present embodiment, the unwrapping step for preventing the unraveling of the metal wire forming the connecting portion 24 is performed between the twisting step and the welding step. May be

The anti-rolling step can use, for example, a method of melting the connecting portion 24 at a predetermined position. That is, after forming the connecting portion 24 in the above-described twisting step, as shown in FIG. 11, one side of the connecting portion 24 is sandwiched and fixed by the chuck 51 of the fusing apparatus 50, and the other side of the connecting portion 24 is It clamps with a chuck | zipper 52 and fixes. Subsequently, by applying a current in this state, the connecting portion 24 between the chucks 51 and 52 is heated, and as shown in FIG. 12, the heating portion is burned out and cut to form an end face 242A.

Thereby, the said connection part 24 can be cut | disconnected, preventing the metal wire which comprises the connection part 24 loosening. Then, as shown in FIG. 13, with the end face 223 of the distal end portion 222 of the operation wire 22 butting against the end face 242A of the connecting portion 24 formed by melting, the welding step described above is carried out. The distal end portion 222 and the connecting portion 24 are joined.

In addition to melting, it is also possible to carry out the anti-rolling step using arc welding. That is, after the connection portion 24 is formed in the above-described twisting step, the connection portion 24 is cut at a predetermined position. Subsequently, as shown in FIG. 14, the connecting portion 24 is sandwiched and fixed by the chuck 61 of the arc welding apparatus 60 so that the cutting portion 243 of the connecting portion 24 protrudes from the end surface 611 of the chuck 61 to the arc electrode 62 side. Do. Subsequently, when arc welding is performed in this state, the cut portion 243 of the connection portion 24 melts, and as shown in FIG. 15, a molten ball 25A is formed. Subsequently, as shown in FIG. 16, the melting spheres 25A are attached to form a vertical end face 242B. Then, in the same manner as in FIG. 13 described above, the welding step is performed in a state where the end surface 223 of the distal end portion 222 of the operation wire 22 butts against the end surface 242B of the connecting portion 24 formed by melting. The distal end portion 222 and the connecting portion 24 are joined.

As described above, according to the method of manufacturing the endoscope treatment tool 1 according to the present embodiment, the proximal end 234 of the snare 23 is twisted to form the connecting portion 24, and the operation wire is connected via the connecting portion 24. By joining 22 and snare 23, the operation wire 22 and the snare 23 can be joined at low cost without causing variations in joining strength or deterioration in product performance and without using advanced skills. In addition, since the operation wire 22 and the snare 23 are joined without using the connecting member, the length of the hard portion can be considerably shortened as compared with the conventional case, and the degree of freedom in product design is expanded.

Moreover, since the metal wire which comprises the operation wire 22 or the snare 23 twists a thin metal wire together, a clearance gap exists between wires. Therefore, as in the general welding method, if only melting and solidifying the metal structure of the joint, the metal structure corresponding to the gap volume between the strands runs short, and the joint is extremely thinly constricted. And defects tend to occur in the metal structure of the joint.

On the other hand, in the method of manufacturing the endoscopic treatment tool 1 according to the present embodiment, as shown in FIG. 9, since the operation wire 22 and the connecting portion 24 of the snare 23 are welded by upset resistance welding, As a result, the metal structure lacking between the strands is replenished, and joint constriction and tissue loss are prevented. In particular, when the operation wire 22 and the snare 23 are formed of thick wires and metal wires with a small number of twists, the gaps between the wires are also large, so the effect of using upset resistance welding is enhanced. .

Furthermore, the endoscope treatment tool 1 according to the present embodiment can obtain a large bonding strength as a whole, and sufficiently satisfy the bonding strength required for the cold snare type endoscope treatment tool 1 as well. Can.

As mentioned above, although the manufacturing method of the treatment tool for endoscopes and the treatment tool for endoscopes concerning the present invention was concretely explained by the form for carrying out the invention, the meaning of the present invention is limited to these statements. It should be interpreted broadly based on the statement of the claims, not Further, it is needless to say that various changes, modifications and the like based on these descriptions are included in the spirit of the present invention.

For example, in the embodiment described above, the wire treatment tool in the endoscopic treatment tool 1 is not limited to the snare 23 shown in FIG. The endoscope treatment tool 1 may use, as a wire treatment tool, for example, as shown in FIG. 17, a snare 23A including polygonal loop portions 231A and 232A made of metal wires. The endoscope treatment tool 1 may use, as a wire treatment tool, for example, as shown in FIG. 18, a snare 23B including asymmetrically shaped loop portions 231B and 232B made of metal wires.

The endoscope treatment tool 1 is a wire treatment tool, for example, as shown in FIG. 19, polygonal loop portions 231C, 232C, 233C, and 234C consisting of four metal wires, and these loop portions 231C, And a tip cap 235C for bundling 232C, 233C, and 234C, and may use a basket 23C.

In the above-described embodiment, the connection structure of the operation wire 22 and the snare 23 in the endoscopic treatment tool 1 used in the cold snare method has been described, but the connection structure is the endoscope used in the hot snare method. It is applicable also to a treatment tool. In this case, a metal terminal is fixed to the slider 14 of the operation unit 10, the proximal end 221 of the operation wire 22 is connected to one end of the terminal, and the high frequency generator is connected to the other end. In addition, since the other structure required for the treatment tool for endoscopes used by such a hot snare system is disclosed by above-mentioned patent document 1, detailed description is abbreviate | omitted.

DESCRIPTION OF SYMBOLS 1 Treatment tool for endoscopes 10 Operation part 11 Body part 11a Guide groove 111 Ring part 12 Cap for joint 13 Breaking part 131 Base end part 14 Slider 141, 142 Ring part 143 Protrusion part 144 Engagement member 15 Stopper pipe 20 insertion Section 21 flexible sheath 211 proximal end 22 operation wire 221 proximal end 222 distal end 223 end face 23, 23A, 23B snare 23C basket 231, 232, 231A, 232A, 231B, 232B, 231C, 232C, 233C, 234C loop Part 233 Tip part 234 Base end 234a Leading end 234b End 235C Tip cap 24 Connection part 242, 242A, 242B End face 243 Cutting part 25 Welded part 25A Melt ball 31, 32 Chuck 40 Upset resistance welding device 41 Fixed side cha Click 42 movable chuck 43 pressure spring 50 fusing device 51 chucks 60 arc welding apparatus 61 chuck 611 end face 62 around the arc electrode 100 endoscope 101 insertion portion 102 upsetting treatment instrument channel A butting portion B

Claims (5)

Metal operation wire,
A wire treatment tool formed by bundling ends of metal wires;
A connecting portion formed by twisting a plurality of metal wires constituting the proximal end portion of the wire treatment tool and having an outer diameter equal to the outer diameter of the operation wire;
Equipped with
An endoscope treatment tool characterized in that an end face of the operation wire and an end face of the connection portion are joined by upset resistance welding in a state where the end face of the operation wire and the end face of the connection portion are butted to each other. The endoscope treatment tool according to claim 1, wherein the wire treatment tool is a loop snare. A method of manufacturing a treatment tool for an endoscope, comprising a metal operation wire, a wire treatment tool formed by bundling end portions of the metal wire, and a connecting portion having an outer diameter equal to the outer diameter of the operation wire. In
A twisting step of twisting a plurality of metal wires forming the proximal end of the wire treatment tool so as to be equal to the outer diameter of the operation wire to form the connecting portion;
A welding step of joining by upset resistance welding in a state in which the end face of the operation wire and the end face of the connecting portion abut each other;
A method of manufacturing a treatment tool for an endoscope, comprising: The method for manufacturing a treatment tool for an endoscope according to claim 3, further comprising a anti-breaking step of melting and cutting the connection portion at a predetermined position between the twisting step and the welding step. The method according to claim 1, further comprising: a detent step of cutting the connection portion at a predetermined position and melting the cut portion of the connection portion by arc welding after the twisting step and the welding step. The manufacturing method of the treatment tool for endoscopes of 3.

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