JP3983856B2 - Tip loop type endoscope treatment tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a treatment instrument for a tip loop type endoscope such as a high-frequency snare or a basket-type grasping tool.
[0002]
[Prior art]
In general, a treatment instrument for a loop-type loop endoscope is configured such that the rear ends of a plurality of elastic wires whose ends are bound together and bent so as to swell out in a loop shape as a whole outside the sheath can be moved forward and backward in the axial direction. The elastic wire is expanded and contracted by entering and exiting from the distal end of the sheath.
[0003]
FIG. 6 shows such a conventional distal loop type endoscope treatment instrument, wherein 1 is a sheath made of a flexible tube, 2 is an operation wire, 10 is an elastic wire, and 20 is an elastic wire. This is a bundling tube for bundling 10 tips.
[0004]
The elastic wire 10 is bent at a plurality of bent portions 11 to 15 so as to swell in a loop shape outside the sheath 1 due to its own elasticity, but each bent portion 11 is drawn into the sheath 1 and constricted. When .about.15 becomes a state extended abruptly as compared with the bent state, the portion undergoes plastic deformation, the bulging shape is broken, and a sufficient bulging amount cannot be obtained.
[0005]
Therefore, there is a short distance between the most advanced bent portion 11 formed in the vicinity of the binding tube 20 and the bent portion 14 positioned at the front end portion of the outer edge of the loop when the elastic wire 10 swells in a loop shape. Thus, a plurality of bent portions 12 and 13 are formed (Japanese Utility Model Laid-Open No. 2-149221).
[0006]
[Problems to be solved by the invention]
However, the conventional distal loop type endoscope treatment tool as described above has to form a large number of bent portions 11 to 14 at a plurality of elastic wires 10 at short intervals. It is very difficult to uniformly perform, and the shape when the elastic wire 10 swells is distorted, and the target object may not be easily captured inside the elastic wire.
[0007]
In addition, since the length L ′ of the portion protruding ahead of the tip portion of the loop becomes longer, the portion hits the wall surface of the organ in a narrow lumen organ or the like, and the object can be easily placed inside the elastic wire. You may not be able to capture.
[0008]
Therefore, according to the present invention, it is easy to form the elastic wire so as to swell in a symmetrical shape, and it is possible to easily capture the object by shortening the length of the portion protruding ahead of the tip portion of the loop. Another object of the present invention is to provide a treatment instrument for a tip loop type endoscope that can maintain the shape of the elastic wire when it swells without being deformed.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a distal loop type endoscope treatment tool according to the present invention includes a flexible sheath that can be inserted into and removed from a treatment tool insertion channel of an endoscope, and a tool that can be moved forward and backward in an axial direction. An operation wire inserted into the sheath and a retractable portion provided in the distal end portion of the sheath so that the distal ends are bound to each other and the rear end is connected to the operation wire so as to form a loop as a whole outside the sheath. A distal loop endoscope treatment instrument having a plurality of elastic wires bent so as to swell, a first bent portion formed in the vicinity of the distal end binding portion of the elastic wire, and the elastic wire looped The portion near the first bent portion is inwardly convex between the second bent portion located at the front end portion of the outer edge of the loop when the loop swells, and the portion closer to the second bent portion Convex outward Characterized by being formed into a smooth curve.
[0010]
The elastic wire may be formed with a third bent portion located at the rear end portion of the outer edge of the loop when the elastic wire swells in a loop shape.
The distal loop endoscope treatment tool may be a high-frequency snare, and two elastic wires may be provided symmetrically at 180 °. The distal loop endoscope treatment tool may be a basket-type grasping tool. Further, three or more elastic wires may be provided.
[0011]
[Form of the present invention]
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of an endoscope high-frequency snare to which the present invention is applied. Reference numeral 1 denotes a flexible tube made of, for example, a tetrafluoroethylene resin tube, and an operation wire 2 made of a stranded metal wire is inserted in the axial direction so as to freely advance and retract. An operation portion (not shown) for operating the operation wire 2 to advance and retreat is connected to the proximal end portion of the sheath 1.
[0012]
A proximal end of a plurality of (in this case, two) elastic wires 10 that swell in a loop shape as a whole at a position protruding from the distal end of the sheath 1 is connected to the distal end of the operation wire 2 via a connecting tube 3.
[0013]
As each elastic wire 10, for example, a stainless steel wire or a stranded wire is used. And the front-end | tip of each elastic wire 10 is inserted in the one bundling pipe | tube 20, and is fixed there by brazing etc. and is united together.
[0014]
Each elastic wire 10 is bent at the first, second, and third bent portions, respectively, and is formed in a shape that swells in a loop shape as a whole when no external force is applied.
[0015]
Among them, the first bent portion 11 is bent outward in the vicinity of the binding tube 20, and the second bent portion 12 is the front end of the outer edge (the most widened portion) of the loop of the elastic wire 10 swelled in a loop shape. The third bent portion 13 is located at the rear end portion of the outer edge of the loop of the elastic wire 10.
[0016]
As shown in an enlarged view in FIG. 5, the elastic wire 10 is inward in the half portion A near the first bent portion 11 in the portion between the first bent portion 11 and the second bent portion 12. It is formed in a smooth arc-shaped curve that is convex to the outside, and the half B near the second bent portion 12 is formed in a smooth arc-shaped curve that protrudes outward, and the boundary portion between both halves is not bent. It is connected smoothly.
[0017]
As shown in FIG. 1, the distal loop type endoscope treatment instrument configured as described above is swollen in a loop shape by its own elasticity when the elastic wire 10 is pushed out from the distal end of the sheath 1. By pulling the operation wire 2 from the operation unit side (not shown), the elastic wire 10 is gradually drawn into the distal end portion of the sheath 1 and becomes narrowed as shown in FIGS. In the sheath 1, the bent portions 11, 12, and 13 are bent back in the direction in which they are straightened.
[0018]
FIG. 5 shows an enlarged portion of the front side of the elastic wire 10, and the bending angle θ of the elastic wire 10 in the first bent portion 11 is determined by the first bent portion 11 and the second bent portion 12. Is significantly smaller than the bending angle θ ′ when the two are connected linearly. The same applies to the second bent portion 12 portion.
[0019]
Accordingly, when the elastic wire 10 is drawn into the sheath 1, the angle at which the bent portions 11, 12, and 13 are bent back is small, so that the plastic deformation of the elastic wire 10 due to insertion into and removal from the sheath 1 is small. However, the original loop shape can be maintained when protruding from the sheath 1.
[0020]
Further, since there is no need to form a bent portion between the first bent portion 11 and the second bent portion 12, the loop shape can be easily and accurately formed symmetrically at the time of manufacture. Sometimes the object can be easily caught in the loop.
[0021]
Further, as shown in FIG. 1, since the length L of the portion of the elastic wire 10 protruding beyond the tip of the loop can be shortened, the object can be looped even in a narrow and tight lumen organ. Can be easily captured inside.
[0022]
The present invention is not limited to the above-described embodiment. For example, a so-called basket-type gripping tool for arranging and collecting three or more elastic wires 10 so as to swell in a basket shape when a loop is formed and capture and collect foreign matters and the like. For example, the present invention may be applied.
[0023]
【The invention's effect】
According to the present invention, the first bent portion formed in the vicinity of the front end binding portion of the elastic wire, and the second bent portion positioned at the front end portion of the outer edge of the loop when the elastic wire swells in a loop shape, Between the first bent portion and the second bent portion, the elastic wire is symmetrically formed by forming it in a smooth curved shape that is convex inward and the second bent portion is convex outward. Since the length of the portion protruding ahead of the tip of the loop can be shortened, the object can be easily captured during use, and the elastic wire Since the amount of deformation of the bent portion is small when constricted, the original loop shape can be maintained even after repeated use.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a distal end portion of a distal loop endoscope treatment tool in a state where an elastic wire according to an embodiment of the present invention swells in a loop shape.
FIG. 2 is a side cross-sectional view of the distal end portion of the distal loop endoscope treatment tool in a state in which the elastic wire according to the embodiment of the present invention is slightly pulled into the sheath.
FIG. 3 is a side cross-sectional view of the distal end portion of the distal loop endoscope treatment instrument in a state in which the elastic wire according to the embodiment of the present invention has been pulled into the sheath by about half.
FIG. 4 is a side cross-sectional view of the distal end portion of the distal loop endoscope treatment tool in a state in which the elastic wire according to the embodiment of the present invention is completely drawn into the sheath.
FIG. 5 is an enlarged partial side view of the distal end portion of the distal loop endoscope treatment tool in a state where the elastic wire according to the embodiment of the present invention is swollen in a loop shape.
FIG. 6 is a side cross-sectional view of a distal end portion of a conventional distal loop endoscope treatment tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheath 2 Operation wire 10 Elastic wire 11 1st bending part 12 2nd bending part

Claims (4)

A flexible sheath that can be inserted into and removed from the treatment instrument insertion channel of the endoscope;
An operation wire inserted into the sheath so as to freely advance and retract in the axial direction;
A plurality of elastic members provided so as to be freely inserted into and withdrawn from the distal end portion of the sheath, the distal ends being bound to each other, and the rear end being coupled to the operation wire and being bent so as to swell in a loop as a whole outside the sheath. In a treatment instrument for a tip loop type endoscope having a wire,
A first bent portion located in the vicinity of the distal end binding portion of the elastic wire; a second bent portion located at a front end portion of an outer edge of the loop when the elastic wire swells in a loop; and A third bent portion located at a rear end portion of the outer edge is formed, and a half portion near the first bent portion is inward between the first bent portion and the second bent portion. Formed in a convex smooth arc-shaped curve, the half near the second bent portion is formed in an outwardly convex smooth arc-shaped curve,
A tip loop type internal view characterized in that a boundary portion between the half portion near the first bent portion and the half portion near the second bent portion is smoothly connected to a state where there is no bent portion and no straight portion. Mirror treatment tool. The elastic wire has a third bent portion positioned at the rear end portion of the outer edge of the loop when the elastic wire swells in a loop shape, and the second bent portion and the third bent portion are end loops endoscope treatment tool according to claim 1, wherein portions that are formed in a convex curved inwardly between. The distal loop endoscope treatment tool according to claim 1 or 2, wherein the distal loop endoscope treatment tool is a high-frequency snare, and two elastic wires are provided symmetrically at 180 °. The treatment instrument for a tip loop type endoscope according to claim 1 or 2, wherein the treatment tool for the tip loop type endoscope is a basket type grasping tool, and three or more elastic wires are provided.

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