JPH10165406A - Wire-loop type processing instrument for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire-loop type processing instrument for endoscope which easily collects foreign objects, etc., in the narrow hollow of a pipe, and is highly safe when an elastic wire is broken due to excessive force. SOLUTION: In a wire-loop type processing instrument for endoscope in which several elastic wires 3 bound at the top end and the rear end to form a loop are connected to the top end of an operation wire 2, a top end A of the elastic wires 3 is not bound using other materials but soldered, brazed, or welded to be bound into one body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire loop type treatment device for an endoscope such as a basket type foreign matter collection device for an endoscope.

[0002]

2. Description of the Related Art Generally, a wire loop type treatment instrument for an endoscope having a loop formed by a wire, such as a basket type foreign matter collection tool for an endoscope, has an operation wire inserted in a mantle tube so as to be able to advance and retreat in an axial direction. A loop is formed by a plurality of elastic wires integrally arranged on the front end side and the rear end side, and the operation wire is connected to the rear end.

[0003] The distal end portion of the elastic wire of such a conventional wire loop type treatment instrument is inserted into a metal pipe-like tip by inserting the distal ends of all the elastic wires and soldering or brazing the portion. They are united and bound together.

[0004]

The diameter of the distal tip as described above becomes a size obtained by adding at least twice the thickness of the distal tip to the diameter in which at least all the elastic wires are bundled, and becomes large.

For this reason, for example, when removing a calculus in a thin lumen such as a bile duct or the like, if the collection tool is inserted into the bile duct, the calculus is pushed into the interior of the bile duct with a distal tip, and the calculus is removed. May not be able to be brought to the position of the elastic wire.

Further, since the elastic wire is firmly bound at the binding portion using the tip, the rear end side of the elastic wire is often damaged when an excessive force is applied to the elastic wire.

[0007] When the binding at the rear end side of the elastic wire is broken in this manner, the elastic wire may be caught on the mucous membrane surface when the foreign object recovery tool is pulled out of the body cavity, which may cause a safety hazard. There's a problem.

Accordingly, the present invention provides a wire for an endoscope which can easily collect foreign matter in a thin lumen and has a high safety even when the elastic wire is damaged by excessive force. An object of the present invention is to provide a loop-type treatment instrument.

[0009]

In order to achieve the above object, a wire loop type treatment instrument for an endoscope according to the present invention has a plurality of loops integrally formed on a distal end side and a rear end side to form a loop. In an endoscope wire loop-type treatment instrument in which the elastic wire is connected to the distal end of the operation wire, the distal end portions of the plurality of elastic wires can be soldered, brazed, welded, or the like without binding with another member. It is characterized in that it is bundled together by being joined together by joining means.

The rear end portions of the plurality of elastic wires are joined together by a joining means such as soldering, brazing or welding without being bound by other members in the same manner as the front end side. May be bundled together.

[0011] Alternatively, the rear end portions of the plurality of elastic wires may be inserted into a pipe and bound, joined to the pipe and bound together. Further, the operation wire may be formed by extending at least one of the plurality of elastic wires.

It is preferable that the length of the joint at the rear end of the elastic wire is longer than the length of the joint at the distal end, and the length of the joint at the distal end of the operation wire is equal to the length of the distal end of the elastic wire. Should be longer than the length of the joint.

The elastic wire may be at least three wires for accommodating foreign matter in the loop, and the elastic wire may be two wires through which a high-frequency current flows.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a distal end portion of a basket-type foreign matter recovery tool for an endoscope to which the present invention is applied.

Reference numeral 1 denotes a flexible outer tube made of, for example, a tetrafluoroethylene tube which is inserted into and removed from a forceps channel of an endoscope, and in which an operation wire 2 is movable in an axial direction. Is inserted and arranged over the entire length. The operation wire 2 is pushed and pulled by an operation unit (not shown) connected to the rear end of the mantle tube 1.

Reference numeral 3 denotes a plurality (for example, four) of elastic wires made of, for example, stainless steel wires which form a cage loop as a whole, and are bundled integrally at the front end A, and at the rear end B, They are bundled together and connected to the operation wire 2. In addition, in order to constitute a basket-type foreign matter collection device, at least three elastic wires 3 may be used.

In the distal end portion A, the distal end portion of the elastic wire 3 is disposed so as to be exposed, and all the elastic wires 3 are integrally formed by soldering or brazing without binding using another member. They are joined in a bundle. The length of the joint is d1. However, they may be joined by welding.

The distal end portion a of the elastic wire 3 integrally joined is rounded with solder, silver solder, or the like so as not to damage the mucous membrane or the like. For this purpose, a solder or a silver solder that protrudes toward the distal end when the elastic wire 3 is joined may be used.

Before the joining operation, a solder flow preventing agent, a low flow preventing agent, etc. are applied to portions other than the portions to be joined before the joining operation so that the length d1 of the joining portion of the front end portion A is not longer than a predetermined length. Good to put.

Alternatively, if each of the elastic wires 3 is pre-coated with solder or silver solder or the like, and the pre-coated portions are bundled and heated, excess solder or silver solder does not flow out and good elasticity can be obtained. Joining can be performed.

At the rear end portion B of the elastic wire 3, a connecting pipe 4 made of, for example, a stainless steel pipe is disposed, and all the elastic wires 3 are inserted into the front half of the connecting pipe 4, and the solder is inserted there. Alternatively, they are joined in a state of being bundled together by a silver low. The length of the joint is d2.

The distal end of the operating wire 2 is inserted into the rear half of the connecting pipe 4, and is joined there by soldering or silver brazing. The length of the joint is d3.

A solder or silver solder is tapered from the distal end surface of the connecting tube 4 to the outer peripheral surface of the elastic wire 3 and from the rear end surface of the connecting tube 4 to the outer peripheral surface of the operation wire 2. The wire 3 or the operation wire 2 is prevented from being damaged by the concentrated stress.

In the basket-type foreign body collecting tool for an endoscope thus configured, the elastic wire 3 is moved into and out of the mantle tube 1 by operating the operating wire 2 so as to expand and contract in a cage shape. it can.

Then, as shown in FIG. 1, the elastic wire 3 is made to protrude from the distal end of the mantle tube 1 so that the elastic wire 3 expands in a cage shape by its own elasticity. The stones can be stored and removed.

At this time, a base for binding the elastic wire 3 is not attached to the distal end portion A of the elastic wire 3 and the diameter of the distal end portion is small. When pushing in, the calculus can be taken into the basket formed by the plurality of elastic wires 3 without pushing the calculus inward at the distal end portion A.

Further, since a base or the like is not attached to the distal end portion A of the elastic wire 3 and the diameter of the portion is small, if the operation wire 2 is pulled toward the hand side, the elastic wire 3 portion can be easily placed in the mantle tube 1. Pass through. Therefore, the operation wire 2
It is also easy to replace only the elastic wire 3 and the portion as necessary.

The length d2 of the joint at the rear end side of the elastic wire 3 and the length d3 of the joint at the distal end of the operation wire 2 are given by:
By making the length of the joint portion of the distal end portion A of the elastic wire 3 longer than the length d1 (that is, d2> d1 and d3> d1), the distal end portion of the elastic wire 3 is always required when an excessive force is applied to the elastic wire 3. The joint of A is broken.

Therefore, even when the elastic wire 3 is damaged, the basket-type foreign matter collecting device can be safely pulled out of the body cavity without the elastic wire 3 being caught on the mucous membrane surface or the like.

FIG. 2 shows a foreign matter collecting device according to a second embodiment of the present invention, in which one of the four elastic wires 3 is extended to the near side (rearward) and operated. It is a wire 2.

The rear end portion B of the elastic wire 3 is joined to a state in which all the elastic wires 3 are integrally bundled by soldering or brazing in the same manner as the front end portion A without using a connecting pipe. Have been.

The structure of the other parts is the same as that of the first embodiment. As in the case of the first embodiment, a calculus is placed in a basket formed by a cage-like expanded elastic wire 3 in a bile duct or the like. 100 can be accommodated, and it is easy to replace only the operation wire 2 and the elastic wire 3.

The length d2 of the joint at the rear end of the elastic wire 3 is set to the length d of the joint at the distal end portion A of the elastic wire 3.
By making the length longer than 1 (that is, d2> d1), as in the first embodiment, when an excessive force is applied to the elastic wire 3, the joining of the distal end portion A of the elastic wire 3 is necessarily broken. It can be safely pulled out of the body cavity.

FIG. 3 shows the tip of a high-frequency snare (third embodiment) to which the present invention is applied. The number of elastic wires 3 is two. The point that the current can be passed is different from the foreign matter collection tool of the second embodiment. The other configuration is the second
In the same manner as in the embodiment, it is possible to perform resection while cauterizing a polyp or the like.

Note that, at the leading end portion A and the trailing end portion B of the elastic wire 3, portions e1 and e2 which are arranged side by side in contact with each other in a state where the two elastic wires 3 are not joined are joined to each other. Are provided adjacent to each other.

As a result, as shown in FIG. 4, when the elastic wire 3 is housed in the mantle tube 1 and contracted, the elastic wire 3 hardly undergoes plastic deformation.
The loop shape when the elastic wire 3 expands outside the mantle tube 1 can be maintained.

FIG. 5 shows the tip of a high-frequency snare according to a fourth embodiment of the present invention. The rear end B of the elastic wire 3 and the operation wire 2 are arranged in the same manner as in the first embodiment. And connected via a connecting pipe 4.

[0038]

According to the present invention, the tip portions of a plurality of elastic wires are joined together by a joining means such as soldering, brazing or welding without being bound by other members, and are bundled together. As a result, the distal end portion of the loop formed by the plurality of elastic wires can be formed thin, so that a foreign substance or the like can be easily collected in a thin lumen without being pushed inward.

Further, since the tip of the loop formed by the plurality of elastic wires can be formed thin,
The elastic wire portion can be easily exchanged by passing through the mantle tube together with the operating wire.

Further, by making the length of the joint at the rear end side of the elastic wire longer than the length of the joint at the distal end side, if the elastic wire is damaged by an excessive force, Since the joint on the side is broken, it can be pulled out of the body cavity without damaging the mucous membrane or the like, and the safety is high.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a tip portion of a basket-type foreign matter collection device according to a first embodiment of the present invention.

FIG. 2 is a side cross-sectional view of a tip portion of a basket-type foreign matter collection device according to a second embodiment of the present invention.

FIG. 3 is a side sectional view of a distal end portion of a high-frequency snare according to a third embodiment of the present invention.

FIG. 4 is a side sectional view of a distal end portion of a high-frequency snare according to a third embodiment of the present invention in which an elastic wire is housed in a mantle tube.

FIG. 5 is a side sectional view of a tip portion of a high-frequency snare according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mantle tube 2 Operation wire 3 Elastic wire A Front end part B Rear end part

Claims (8)

[Claims] 1. An endoscope wire loop-type treatment instrument, wherein a plurality of elastic wires integrally bound on a distal end side and a rear end side to form a loop are connected to a distal end of an operation wire. A wire loop type treatment for an endoscope, wherein the distal ends of the elastic wires are bundled together by being joined together by joining means such as soldering, brazing or welding without being bound by another member. Utensils. 2. The rear end portions of the plurality of elastic wires are joined together by a joining means such as soldering, brazing or welding without being bound by other members in the same manner as the front end side. The wire loop-type treatment instrument for an endoscope according to claim 1, which is bundled with the endoscope. 3. The wire loop type for an endoscope according to claim 1, wherein the rear end portions of the plurality of elastic wires are inserted into a pipe and bound, and are joined to the pipe and integrally bound. Treatment tools. 4. The endoscope wire loop treatment device according to claim 1, wherein the operation wire is formed by extending at least one of the plurality of elastic wires. 5. The joint portion on the rear end side of the elastic wire is longer than the joint portion on the front end side.
The wire loop type treatment tool for an endoscope according to the above. 6. The length of the joint at the tip of the operation wire is as follows:
6. The wire loop treatment device for an endoscope according to claim 5, wherein the length is longer than the length of the joint portion on the distal end side of the elastic wire. 7. The elastic wire according to claim 1, wherein the elastic wire is at least three wires for accommodating foreign matter in the loop.
7. The wire loop treatment device for an endoscope according to 2, 3, 4, 5, or 6. 8. The wire loop treatment device for an endoscope according to claim 1, wherein the elastic wire is two wires through which a high-frequency current flows.