JP2002034994A - Method of manufacturing treatment implement for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of operation and strength in a method of manufac turing a treatment implement for an endoscope made of a wire and inserted into an insertion channel of a treatment implement of the endoscope such as a high frequency snare for eliminating a tissue part such as polyp in a body cavity by the external operation. SOLUTION: Two wires are bundled while lining up tips of the wires, and the tips of the wires are melted and bound to solve the problems. The two wires are bundled in a state of being lined up at the tips by inserting the two wires into a pipe, whereby the problems can be solved. Further the problems can be also solved by bundling at least three wires while lining up the tips, and melting and bonding the tips of the wires.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency snare for removing a tissue portion such as a polyp generated in a body cavity by an external operation. The present invention relates to a method for manufacturing an endoscope treatment tool.

[0002]

2. Description of the Related Art A high-frequency snare has conventionally been used as an endoscope treatment tool used to resect a tissue portion such as a polyp generated in a body cavity by an external operation.
The high-frequency snare is a wire whose tip is formed in a loop shape, and is inserted into a treatment tool insertion channel, which is a non-conductive tube, from a treatment tool port of the endoscope such that the loop projects toward the endoscope distal end. Is placed.

[0003] When the wire (hand side) protruding from the treatment tool port is pulled, a loop is drawn into the treatment tool insertion channel, and a loop diameter of a portion of the loop protruding from the treatment tool insertion channel. Shrinks. When the wire (hand side) protruding from the treatment tool opening is pushed in, the loop is pushed out from the treatment tool insertion channel, and the loop diameter of the portion of the loop protruding from the treatment tool insertion channel is increased. Therefore,
By operating the wire from the hand of the endoscope to advance and retreat, a loop diameter of a portion of the loop protruding from the treatment instrument insertion channel can be freely changed.

Further, a high-frequency current can be supplied to the wire by operating the operation means on the hand side.
The living tissue in contact with the wire is cauterized by the high-frequency current flowing through the wire. In other words, the protruding living tissue can be cauterized and resected by sandwiching the protruding living tissue such as a polyp in the loop and applying a high-frequency current to the wire.

[0005] The protruding living tissue (hereinafter referred to as an affected part) is cauterized and resected in the following procedure. That is, the endoscope is inserted near the affected part in the body cavity, and the affected part is surrounded by a loop. Next, the affected part is tightened by pulling a wire from the endoscope's hand side, and blood vessels in the affected part are squeezed to stop blood flow. Further, a high-frequency current is applied to the wire to cauterize the tissue while coagulating the blood.

In a conventional high-frequency snare, as shown in FIG. 10, one loop forming wire 103 is bent at a central portion 103a, and both ends are inserted into a pipe-shaped jumpsuit 104, and both ends are connected to each other by means such as brazing. To form a loop. However, the conventional high-frequency snare has the length L of the loop forming wire 103L on the left (upper side in the figure) of the central portion 103a and the central portion 10a.
Loop forming wire 103R to the right (lower in the figure) of 3a
In some cases, the length R was not evenly aligned.

Therefore, for example, when the length R is shorter than the length L, as shown in FIG. 11, tension is applied only to the loop forming wire 103L when tightening the affected part 150,
The loop forming wire 103R is likely to be in a so-called single-drawing state in which almost no tension is applied. If a high-frequency current is passed through the loop forming wire 103 in this state, cauterization is performed without squeezing the blood vessel, and thus bleeding may occur.

Further, such a high-frequency snare is used to insert another treatment tool (basket holding tool, forceps, etc.) for removing the diseased part from the body cavity after the resection of the diseased part through the treatment tool insertion channel. When the wire is to be pulled out from the treatment instrument insertion channel, as shown in FIG. 12, the tip of the loop forming wire 103 is hooked on the tip of the treatment instrument insertion channel 106 with the neck bent, and the loop forming wire 103 is pulled.
Is not drawn into the treatment instrument insertion channel 106.

In addition, such a high-frequency snare has a problem in that when bending a wire into a loop, bending stress concentrates on the bent portion, and the strength of that portion is reduced.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a method for manufacturing a treatment tool for an endoscope which solves the above problems and eliminates problems in operation and strength.

[0011]

In order to achieve the above object, a method for manufacturing a treatment tool for an endoscope according to claim 1 is provided.
A method for manufacturing a treatment tool for an endoscope including a wire that is inserted into a treatment tool insertion channel so as to be able to advance and retreat, and protrudes from a tip of the treatment tool insertion channel to form a loop,
A loop protruding from the distal end of the treatment instrument insertion channel is created by bundling the two wires with the distal ends aligned and fusing the distal ends of the wires together.

In the method for manufacturing a treatment tool for an endoscope according to the first aspect, a wire on the left side from the center of the loop and a wire on the right side from the center are separately prepared, and the lengths of both wires are reduced. Since the tips of the two wires are fused and joined in an evenly aligned state, the length of the wire to the left of the center of the loop and the length of the wire to the right of the center do not become uneven. In addition, since no bending stress is applied to the center of the loop when forming the loop, the strength of the center of the loop is secured.

Here, a configuration may be adopted in which the two wires are inserted into a pipe so that the two wires are bundled with their ends aligned. Further, the wire and the pipe may be fusion-bonded at a position of the tip of the wire (claim 3).

The two wires may be melt-bonded by exposing the two wires to an arc column to melt-bond the wires (claim 4), and irradiating the two wires with a laser beam. Melt bonding (claim 5).

The method for manufacturing a treatment tool for an endoscope according to the present invention is applied to a wire which is inserted into a treatment tool insertion channel so as to be able to advance and retreat, and protrudes from the distal end of the treatment tool insertion channel to form a loop. However, the present invention is not limited to the endoscope treatment tool provided with That is, at least three wires inserted into the treatment instrument insertion channel so as to be able to advance and retreat are protruded from the distal end of the treatment instrument insertion channel, and the at least three wires are fusion-bonded at the distal end to be outside the treatment instrument insertion channel. The present invention is also applied to a treatment tool for an endoscope which is formed so as to expand in a basket shape with the above (claim 6).

[0016]

FIG. 1 shows a method for manufacturing a high-frequency snare according to a first embodiment of the present invention. High frequency snare 1 is 1
Connect the hand operation wire 2 of the book to the jumpsuit 4 at the hand side (right side in the figure)
The loop forming wires 3L and 3R are further inserted from the treatment instrument side (left side in the figure). Next, jumpsuit 4
And the hand operation wire 2 and the loop forming wires 3L and 3R are joined by means such as brazing.

Next, the loop forming wires 3L and 3R
The length of the part protruding from the jumpsuit 4 is trimmed. Further, the joining portions 3a are formed by melting and joining the tips of the loop forming wires 3L and 3R.

Here, the loop forming wires 3L and 3R
FIG. 2 shows an example of a method for fusion-bonding the tips of the above. Here, the loop forming wires 3L and 3R are connected to the first electrode 2
01 and also loop forming wires 3L and 3R
A second electrode 202 is provided near the tip of the second electrode 202. Further, in order to prevent oxidation of the terminal, the distal ends of the loop forming wires 3L and 3R and the periphery of the second electrode 202 are filled with argon gas.

Here, the first electrode 201 and the second electrode 2
By supplying a predetermined power during the period 02, an arc column 203 is generated between the distal ends of the loop forming wires 3L and 3R and the second electrode 202. Arc column temperature is 50
Since the temperature is extremely high at 00K or more, the distal ends of the loop forming wires 3L and 3R are melted, and a spherical joint 3a is formed by the surface tension. Next, the supply of electric power between the first electrode 201 and the second electrode 202 is stopped, and the arc column 203 is extinguished.
Since a is cooled to its freezing point, it is hardened as a result with its shape being spherical.

Further, as shown in FIG. 3, the first electrode 201 is not connected to the loop forming wires 3L and 3R, and a predetermined power is supplied to the first electrode 201 and the second electrode 202 so that the An arc column 203a is generated between the first electrode 201 and the second electrode 202, and the distal end portions of the loop forming wires 3L and 3R are exposed to the arc column 203a to form the joint 3a. .

Further, as shown in FIG.
Power is supplied to the third electrode 206 having the following formula: and the second electrode 202 installed near the third electrode 206 to cause the arc column 203b to be ejected from the nozzle 206a, and the tip of the loop forming wires 3L and 3R. The joint 3a can also be formed by exposing the portion to the arc column 203b ejected from the nozzle 206a.

The fusion bonding of the distal ends of the loop forming wires 3L and 3R is not limited to the method of exposing the distal ends of the loop forming wires 3L and 3R to an arc column, but may be performed in the vicinity of the distal ends of the loop forming wires 3L and 3R. Therefore, it is only necessary to selectively heat the very small area of the loop. Therefore, for example, the tip of the loop forming wires 3L and 3R is irradiated with a laser and heated to melt and join the tip of the loop forming wires 3L and 3R to form the joint 3a. It may be formed.

Next, as shown in FIG. 5, the loop forming wires 3L and 3R are opened to form a substantially elliptical loop 3.

As described above, in the method of manufacturing the high-frequency snare according to the first embodiment of the present invention, the lengths of the loop forming wires 3L and 3R are adjusted in advance, and then the two are joined. When the affected part is cauterized and cut, it becomes squeezed to cause bleeding, or when the high-frequency snare 1 is pulled out from the treatment instrument insertion channel of the endoscope, the loop 3 holds the neck and is caught on the distal end of the treatment instrument insertion channel. There is no fear.

Further, since the loop forming wire is not bent when the loop 3 is formed, the strength of the loop forming wire is secured.

FIG. 6 shows a method of manufacturing a basket gripper according to a second embodiment of the present invention. The basket grasping tool is an endoscope treatment tool used to remove an affected part cut out by a treatment tool such as a high-frequency snare.
The basket gripper is a wire with a tip formed in a basket shape, and is inserted into the treatment instrument insertion channel from the treatment instrument port of the endoscope such that the basket portion protrudes toward the distal end of the endoscope.

Here, when the wire (hand side) protruding from the treatment tool opening is pulled, the basket portion is drawn into the treatment tool insertion channel, and the portion of the basket portion protruding from the treatment tool insertion channel. At the same time, the distance between the wires forming the cage portion is reduced. Also,
When the wire (hand side) protruding from the treatment tool opening is pushed in, the basket portion is pushed out from the treatment tool insertion channel, and the volume of the portion of the basket projecting from the treatment tool insertion channel increases. At the same time, the distance between the wires forming the cage is widened. Therefore, by operating the wire from the endoscope hand side to advance and retreat, the volume of the portion of the basket portion protruding from the treatment instrument insertion channel and the distance between the wires forming the cage portion can be freely set. Can be changed.

That is, the wire (hand side) protruding from the treatment tool opening is pushed in to widen the interval between the wires forming the cage portion, and the excised diseased part is replaced with the wire forming the cage portion. Put in the basket through the gap. Next, the wire (hand side) protruding from the treatment tool port is pulled to reduce the volume of the portion of the basket protruding from the treatment tool insertion channel and the distance between the wires forming the cage. Then, the affected part is gripped in the basket part.

Further, the affected part is removed from the body cavity by pulling out the endoscope from the body cavity while the affected part is grasped by the cage part.

In the basket gripper 11 shown in FIG. 6, one hand operation wire 12 is inserted into the jumper 14 from the hand side (right side in the figure), and three baskets from the treatment tool side (left side in the figure). The part forming wire 13b is inserted. Next, jumpsuit 1
4, hand operation wire 12, and three cage forming wires 1
3b is joined by means such as brazing.

Next, the lengths of the three cage forming wires 13b protruding from the jumper 14 are trimmed. Further, the distal ends of the three cage forming wires 13b are fusion-bonded to form a joint 13a.

As a method for fusion-bonding the tip portions of the three cage-forming wires 13b, similarly to the method for fusion-bonding the loop-forming wires 3L and 3R of the high-frequency snare 1 shown in FIGS. Exposing the tips of the three cage forming wires 13b to the arc columns, or irradiating the laser to the tips of the three cage forming wires 13b to heat them, and exposing the tips of the three cage forming wires 13b. There is a method of melting and joining the parts.

Next, as shown in FIG. 7, the three cage forming wires 13b are opened to form the cage 13.

Therefore, in the basket manufactured by the method for manufacturing a basket gripper according to the second embodiment of the present invention, the tip of the basket forming wire 13b is exposed to the arc column, or the tip of the basket forming wire 13b is exposed. Since the joining portion 13a is formed by using means for selectively heating and melting a minute region at the tip end of the cage portion forming wire 13b such as irradiating a laser beam to the joining portion 13a, the joining portion 13a can be made as small as possible. Therefore, the basket gripper manufactured by the method for manufacturing a basket gripper according to the second embodiment of the present invention can easily perform the work for removing the affected part even in a narrow body cavity.

To ensure that the tips of the three cage forming wires 13b are aligned, the tips of the three cage forming wires 13b are inserted into a metal pipe 15 as shown in FIG. Alternatively, the joints 13c may be formed by melting and joining the pipes 15 and the distal ends of the three cage forming wires 13b.

Similarly, when manufacturing a high frequency snare, as shown in FIG.
Of the loop-forming wires 3L and 3R by inserting the distal end of the loop-forming wires 3L and 3R into the joining portion 3c by melting the pipe 5 and the distal ends of the loop-forming wires 3L and 3R. Can be surely arranged.

[0037]

As described above, according to the method for manufacturing a treatment tool for an endoscope of the present invention, a treatment tool for an endoscope in which defects in operation and strength are eliminated is realized.

[Brief description of the drawings]

FIG. 1 shows a state in which the tip portions of two loop forming wires are fusion-bonded by a method of manufacturing a high-frequency snare according to a first embodiment of the present invention.

FIG. 2 shows a state in which the distal ends of two loop forming wires are exposed to an arc column and are fusion-bonded in the method of manufacturing a high-frequency snare according to the first embodiment of the present invention.

FIG. 3 shows a state in which the distal ends of two loop forming wires are exposed to an arc column and are melt-bonded in the method of manufacturing a high-frequency snare according to the first embodiment of the present invention.

FIG. 4 shows a state in which the distal ends of two loop forming wires are exposed to an arc column and are melt-bonded in the method of manufacturing a high-frequency snare according to the first embodiment of the present invention.

FIG. 5 shows a high-frequency snare manufactured by the high-frequency snare manufacturing method according to the first embodiment of the present invention.

FIG. 6 shows a state in which the distal ends of three cage forming wires are melt-bonded by the method for manufacturing a basket gripper according to the second embodiment of the present invention.

FIG. 7 shows a basket gripper manufactured by the method for manufacturing a basket gripper according to the second embodiment of the present invention.

FIG. 8 shows a state in which the tips of the pipe and the three cage forming wires are melt-bonded by the method for manufacturing a basket gripper according to the second embodiment of the present invention.

FIG. 9 shows a state in which the distal ends of the pipe and the two loop forming wires are melt-bonded by the method for manufacturing a high-frequency snare according to the first embodiment of the present invention.

FIG. 10 shows a high-frequency snare manufactured by a conventional method for manufacturing an endoscope treatment tool.

FIG. 11 shows a state in which a high-frequency snare manufactured by a conventional method for manufacturing a treatment tool for an endoscope has a single-sided down on an affected part.

FIG. 12 is a view showing a state in which a high-frequency snare manufactured by a conventional method for manufacturing a treatment tool for an endoscope is pulled out from the treatment tool insertion channel; This shows a state in which the tip is hooked.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency snare 2 Hand operation wire 3 Loop 3a Joint 3c Joint 3L Loop forming wire 3R Loop forming wire 4 Jumper 5 Pipe 11 Basket gripper 12 Hand operating wire 13 Basket 13a Joint 13b Basket forming wire 13c Joint 14 Jumpsuit 15 Pipe 101 High frequency snare 102 Hand operation wire 103 Loop forming wire 103a Loop forming wire central portion 103L Loop forming wire 103R Loop forming wire 104 Jumpsuit 106 Treatment tool insertion channel 201 First electrode 202 Second electrode 203 Arc pole 203a Arc Column 203b Arc column 206 Third electrode 206a Nozzle

Claims (10)

[Claims] 1. A method of manufacturing a treatment tool for an endoscope comprising a wire which is inserted into a treatment tool insertion channel so as to be able to advance and retreat, and which protrudes from a distal end of the treatment tool insertion channel to form a loop. A method for manufacturing a treatment tool for an endoscope, comprising: forming a loop protruding from a tip of the treatment tool insertion channel by bundling the wires with their tips aligned and fusion-bonding the tips of the wires. 2. The method for manufacturing a treatment tool for an endoscope according to claim 1, wherein the two wires are bundled with their ends aligned by inserting the two wires through a pipe. 3. The method for manufacturing a treatment tool for an endoscope according to claim 2, wherein the wire and the pipe are fusion-bonded at a position of a tip end of the wire. 4. The method according to claim 1, wherein the two wires are exposed to an arc column to be melt-bonded.
The method for producing an endoscope treatment tool according to any one of the above. 5. The method for manufacturing a treatment tool for an endoscope according to claim 1, wherein a laser beam is applied to the two wires so as to be fused. 6. At least three wires inserted into the treatment instrument insertion channel so as to be able to advance and retreat from the distal end of the treatment instrument insertion channel, and the at least three wires are coupled at the distal end to insert the treatment instrument insertion channel. A method for manufacturing a treatment tool for an endoscope formed so as to expand in a cage shape outside a channel, wherein the at least three wires are bundled with their tips aligned, and the tips of the wires are fusion-bonded. Do
A method for manufacturing a treatment tool for an endoscope. 7. The treatment instrument for an endoscope according to claim 4, wherein the at least three wires are bundled with their tips aligned by inserting the at least three wires through a pipe. Method. 8. The method for manufacturing a treatment tool for an endoscope according to claim 7, wherein the wire and the pipe are fusion-bonded at a position of a tip end of the wire. 9. The method for manufacturing a treatment tool for an endoscope according to claim 6, wherein the at least three wires are exposed to an arc column and fused. 10. The method according to claim 1, wherein the at least three wires are irradiated with a laser beam to be melt-bonded.
A method for manufacturing a treatment tool for an endoscope according to any one of claims 6 to 8.