JP2002253559A - Wire loop type treatment device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire loop type treatment device for an endoscope, which has an elastic wire hardly set in fatigue even after repeatedly used and capable of holding a state enlarging into a prescribed dimension of the loop. SOLUTION: This elastic wire 3 forming a prescribed dimension of a loop A in a natural state is made to cross without binding in the rear end position of the loop A and further extended rearward, and the extension end is connected to an operation wire 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire loop treatment device for an endoscope which is used to be inserted into and removed from an endoscope.

[0002]

2. Description of the Related Art FIG. 8 shows a distal end portion of an endoscope snare, which is a typical endoscope wire loop type treatment instrument, which can be inserted into and removed from a treatment instrument insertion passage of the endoscope. Flexible sheath 1
The operation wire 2 is inserted through the inside so as to be able to advance and retreat in the axial direction.

[0003] An elastic wire 3 forming a loop A of a predetermined size in a natural state is connected to the tip of the operating wire 2, and the elastic wire 3 is flexible by operating the operating wire 2 from behind. When the flexible sheath 1 enters and exits from the distal end of the flexible sheath 1 and is pushed out from the distal end of the flexible sheath 1, it expands into a loop A having a predetermined size and is elastically deformed by being drawn into the flexible sheath 1. It is swelling.

[0004]

However, in the snare for an endoscope having the above-described structure, the elasticity of the elastic wire 3 decreases as the elastic wire 3 is repeatedly put in and out of the flexible sheath 1. As shown by a two-dot chain line, even if the elastic wire 3 is pushed out of the flexible sheath 1, the loop does not spread to a predetermined size in many cases.

Accordingly, the present invention provides a wire loop type treatment instrument for an endoscope which can maintain a state in which an elastic wire is hard to set and spread in a loop of a predetermined size even after repeated use. With the goal.

[0006]

In order to achieve the above object, a wire loop type treatment instrument for an endoscope according to the present invention is provided with a distal end of an operation wire which is inserted through a cylindrical hole so as to be able to advance and retreat in an axial direction. An elastic wire forming a loop of a predetermined size in a natural state is connected thereto, and by operating the operating wire forward and backward, the elastic wire comes into and out of the tip of the cylindrical hole, and the tip of the cylindrical hole In an endoscope wire loop-type treatment instrument which is swelled in a loop shape of a predetermined size in a state where it is pushed out of the tube, and is elastically deformed and contracted by being drawn into a cylindrical hole, an elastic wire is squeezed. At the rear end position of the loop having the size as shown in the drawing, they are crossed without binding and extended further rearward, and the extended end is connected to the operation wire.

[0007] The elastic wire may form a second loop at an extended portion behind the rear end position of the loop having a predetermined size. The cylindrical hole may be a space inside the flexible sheath inserted into and removed from the treatment instrument insertion passage of the endoscope, or may be an internal space of the treatment instrument insertion passage of the endoscope. Is also good.

[0008]

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a distal end portion of a first embodiment in which the present invention is applied to an endoscope snare for performing endoscopic polyp resection, etc., and FIG. FIG. 2 is a side view.

1 is, for example, about 2 mm in diameter and 1 in length.
It is a flexible sheath made of a tetrafluoroethylene resin tube of about 2 m, and is inserted into and removed from a treatment tool insertion passage of an endoscope (not shown).

An operation wire 2 made of, for example, a stranded stainless steel wire is inserted through the flexible sheath 1 so as to be able to advance and retreat in the axial direction, and is connected to the rear end of the flexible sheath 1. The operation unit (not shown) moves forward and backward.

An elastic wire 3 made of, for example, a stranded wire or a single wire of a stainless steel wire is connected to a distal end of the operation wire 2 via a connection pipe 4. However, the elastic wire 3 may be an extension of the operation wire 2.

The elastic wire 3 has a small U
A first loop A, which is bent back into a letter shape and spreads to a predetermined size in a natural state in a forward portion, is formed by the elastic wire 3.

The elastic wire 3 intersects without being bound at the rear end position of the first loop A, and extends from the intersection 3b to the rear, forming a smooth curve as it is. A second loop B is formed between the two.

In the snare for an endoscope of the embodiment configured as described above, by operating the operating wire 2 forward and backward from the rear, the elastic wire 3 is moved into the internal space (the cylindrical hole) of the distal end portion of the flexible sheath 1. ) Enters and exits and elastically deforms.

When the elastic wire 3 is pushed out of the flexible sheath 1 as shown in FIG.
The loop A and the second loop B are each swelled to a predetermined natural size by the elasticity of the elastic wire 3 itself, so that a polyp or the like can be surrounded by the first loop A.

When the operating wire 2 is pulled backward, FIG.
As shown in (1), the elastic wire 3 is pulled into the distal end of the flexible sheath 1 and is elastically deformed, so that the first loop A and the second loop B are both narrowed. Therefore, this state is maintained when the endoscope is inserted into or removed from the treatment instrument insertion passage.

Then, after the polyp is positioned in the first loop A in the state shown in FIG. 1, the operation wire 2 is pulled backward, and the first loop A is drawn into the flexible sheath 1 halfway. The polyp to the first state
And can be cut with a loop A.

At this time, if a high-frequency current can be supplied to the elastic wire 3 via the operation wire 2, a portion of the mucous membrane that contacts the elastic wire 3 is cauterized and coagulated to prevent bleeding. .

As shown in FIG. 1, the endoscope snare of the first embodiment is denoted by S if the elastic wire 3 has a length that forms only the first loop A. The length of the elastic wire 3 is different from that of the intersection 3
The first loop A and the second loop B are formed without being bound by b, and have a length indicated by L.

As a result, even if the elastic wire 3 repeatedly swells and contracts due to being put into and taken out of the flexible sheath 1, "sagging" is unlikely to occur. It is possible to maintain a state of spreading in size.

Further, as shown in FIG. 4, when only the second loop B at the rear half of the elastic wire 3 is pulled into the flexible sheath 1, the second loop B is crushed. As a result, the first loop A is expanded to be larger than the initial predetermined size, so that a larger polyp can be ligated.

The present invention is not limited to the above-described embodiment. As in the second embodiment shown in FIG. 5, a cylindrical hole into which the operation wire 2 is advanced and retracted and the elastic wire 3 is inserted and removed. Alternatively, a structure in which the flexible sheath 1 is omitted by directly using the treatment tool insertion passage 11 of the endoscope 10 may be adopted.

In the first embodiment, the first loop A is polygonal, and the second loop B is smaller than the first loop A. However, the third embodiment shown in FIG. As described above, the first loop A may be formed in a smooth curved shape, and the second loop B may be formed in the same size as the first loop A (or larger than the first loop A). No problem. Further, a binding tube or the like may be provided at the distal end portion 3a of the elastic wire 3.

Further, as in the fourth embodiment shown in FIG. 7, the elastic wire 3 is twisted at the intermediate portion to form the second loop B
By changing the orientation of the first loop A with respect to, the direction of the approach to the polyp can be changed.

[0025]

According to the present invention, an elastic wire which forms a loop of a predetermined size in a natural state is crossed without binding at the rear end position of the loop, and is further extended rearward. By connecting the end to the operation wire, it becomes difficult for the elastic wire to “set” when the loop is expanded and contracted, and the elastic wire spreads over a loop of a predetermined size even after repeated use. Can be maintained over time.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a distal end portion of an endoscope snare according to a first embodiment of the present invention in a state where an elastic wire is swollen.

FIG. 2 is a side view of a distal end portion of the endoscope snare according to the first embodiment of the present invention in a state where an elastic wire is swollen.

FIG. 3 is a plan sectional view of a distal end portion of the endoscope snare according to the first embodiment of the present invention, in which an elastic wire is housed.

FIG. 4 is a plan cross-sectional view of a distal end portion of the endoscope snare according to the first embodiment of the present invention in a state where an elastic wire is stored to an intermediate position.

FIG. 5 is a plan sectional view of a distal end portion of an endoscope snare according to a second embodiment of the present invention.

FIG. 6 is a plan sectional view of a distal end portion of an endoscope snare according to a third embodiment of the present invention.

FIG. 7 is a plan sectional view of a distal end portion of an endoscope snare according to a fourth embodiment of the present invention.

FIG. 8 is a plan sectional view of a distal end portion of a conventional endoscope snare.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible sheath 2 Operation wire 3 Elastic wire 3a Tip part 3b Intersection 10 Endoscope 11 Treatment tool insertion path A First loop B Second loop

Claims (4)

[Claims] An elastic wire forming a loop of a predetermined size in a natural state is connected to a distal end of an operation wire inserted in the cylindrical hole so as to be able to advance and retreat in the axial direction, and the operation wire is connected from behind. By the reciprocating operation, the elastic wire enters and exits the distal end of the cylindrical hole, and when the elastic wire is pushed out from the distal end of the cylindrical hole, the elastic wire swells in a loop shape of the predetermined size, and the inside of the cylindrical hole An endoscope wire loop-type treatment instrument which is elastically deformed and narrowed by being pulled into the elastic wire, wherein the elastic wires are crossed without binding at a rear end position of the loop having the predetermined size. A wire loop type treatment device for an endoscope, wherein the treatment device is extended rearward and an extension end thereof is connected to the operation wire. 2. The endoscope wire loop treatment device according to claim 1, wherein the elastic wire forms a second loop at a portion extending rearward from a rear end position of the loop of the predetermined size. 3. The endoscope wire loop type treatment instrument according to claim 1, wherein the cylindrical hole is a space inside a flexible sheath inserted into and removed from the treatment instrument insertion passage of the endoscope. . 4. The endoscope wire loop-type treatment tool according to claim 1, wherein the cylindrical hole is an internal space of a treatment tool insertion passage of the endoscope.