JPH062663Y2 - Endoscope sampling tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an endoscope collecting tool which is inserted into a forceps channel of an endoscope and is used to collect foreign substances in a body cavity. is there.

[Prior Art] In this type of endoscope collecting tool, a plurality of elastic wires are extruded from the tip of a flexible tube to bulge in a loop shape, and foreign substances and the like are captured in the elastic wires. ing.

The tips of such a plurality of elastic wires need to be fixed so as not to shift from each other, but when using, for example, a super elastic metal or the like, which is not suitable for soldering, for the elastic wire,
The tip of the elastic wire is bound by caulking the legs of the metal binding member.

[Problems to be Solved by the Invention] A force to repeatedly expand and contract the elastic wire is applied to the binding portion at the tip of the elastic wire. Therefore, if the ends of the elastic wires are bound by only the plastic deformation process of crimping the legs of the binding member, the legs of the crimped binding member may be broken due to fatigue, resulting in durability. And it was a problem in terms of safety.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an endoscopic sampling tool that is capable of reliably binding the ends of elastic wires that are bulged in a loop shape and that has excellent durability and safety.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the endoscopic sampling tool of the present invention is provided with a plurality of elastic wires that can be inserted into and removed from the distal end of a flexible tube, and the plurality of elastic wires can be inserted and removed. An endoscope sampling tool in which an elastic wire bulges out of the tube in a loop shape, wherein small loops are formed at the tips of the elastic wires, and the small loops intersect each other at the tips to form a U-shape. The binding wires formed in the above are passed between the elastic wires adjacent to each other at the intersection, and all the ends of the binding wires are inserted and fixed in one tubular body to bind the tips of the plurality of elastic wires. Is characterized by.

[Example] An example will be described with reference to the drawings.

2 and 3 show a distal end portion and an operating portion of the endoscopic sampling tool according to the first embodiment of the present invention.

In the figure, reference numeral 1 denotes a flexible tube made of, for example, tetrafluoroethylene resin, which connects the tip portion and the operation portion.

Reference numeral 22 denotes an elastic wire that is provided so as to be able to move in and out from the tip 1 a of the flexible tube 1, and when pushed out from the flexible tube 1, it bulges in a loop shape. If a so-called superelastic alloy (a kind of shape memory alloy made of Ni-Ti alloy) is used as the material of the elastic wire 22, excellent resilience at the time of swelling can be obtained.

Of course, the elastic wire 22 may be made of a general elastic material such as stainless steel wire.

In this embodiment, two elastic wires 22 that are connected are used and bent back at the tip to form an apparent four wires, all four of which are movable back and forth in the flexible tube 1. , Is inserted over the entire length.

Then, from the tip of the flexible tube 1, the four elastic wires 22 swell in a loop shape at intervals of 90 degrees. 22a
Is the loop part.

Two small loop portions 22c are continuously formed at the tip of each loop 22a at the tip of each elastic wire 22 that is provided with a 90 degree offset. Then, the tips of the leading edge small loop portions 22c are crossed with each other, and the crossing portions are bound by a tip tip 33 as shown in FIG.

As shown in FIG. 1, in the distal tip 33, each elastic wire 22 is alternately passed between two short binding wires 33a which are inverted in a U-shape, and each binding wire 33a is elastic. It passes between the wires 22. Then, the ends of the binding wires 33a are inserted into the binding tube 33b (tubular body) and fixed by soldering or the like, whereby the tips of the elastic wires 22 are bound together.

Even if this structure is repeatedly used, there is no risk of the tip being damaged by plastic deformation unlike caulking. Further, when a superelastic alloy such as a shape memory alloy made of Ni-Ti alloy that cannot be heated during binding is used for the elastic wire 22, etc., such a tip 33 is used.
Is particularly effective.

In this way, by fixing the ends of the elastic wires 22 to each other, the positional relationship between the elastic wires does not shift. Further, by forming a plurality of small loop portions in a continuous manner, it is possible to obtain a more reliable restoration property at the time of bulging.

Reference numeral 4 shown in FIG. 2 denotes a tubular material made of, for example, stainless steel tubular material, the outer diameter of which is smaller than the inner diameter of the flexible tube 1, and the inner diameter of which is four elastic wires 22 arranged side by side.
The size is such that all can be bundled and inserted.

Further, the length of the pipe member 4 is formed so short (for example, about 3 to 8 mm) that the flexible tube 1 can be advanced and retracted in the tube 1 without resistance in a bent state.

All the elastic wires 22 drawn into the flexible tube 1 are bundled in the distal end of the flexible tube 1 to form the tubing 4
All the elastic wires 22 and the tubular member 4 are fixed to each other with an adhesive therethrough.

That is, the tubing 4 has the elastic wire 22 and the loop portion 22.
It is bound near the base of a and moves back and forth together with the elastic wire 22. Therefore, the arrangement of the elastic wires 22 in the vicinity of the tip portion is not disturbed or twisted with each other, and a constant loop shape can always be obtained stably.

The four elastic wires 22 arranged side by side are drawn up to the base end portion 1b of the flexible tube 1, and are connected to the known operation portion 5 there.

The operation section 5 may be of any type, so a detailed description thereof will be omitted, but the four elastic wires 22 are bundled and inserted into the long pipe 6 (for example, 100 mm) on the proximal end side, Therefore, they are fixed by caulking or adhesion. Here, since the length of the pipe 6 can be set to a sufficient length, it is possible to obtain a durable fixing force that is not destroyed by normal operation.

In the above-described embodiment having such a configuration, the operation unit 5
By operating the pipe 6 to move back and forth from the side, the elastic wire 22 bulges in a loop from the tip of the flexible tube 1 or the loop shrinks.

In the above embodiment, two elastic wires 22 are used by bending back at each tip, but three or more elastic wires may be used. Further, as shown in FIG. 4, the tip end of the figure-eight elastic wire 22 in which only one small loop 22c is formed at the tip of the loop portion 22a is bound by the tip tip 33 as described above. Good.

In the endoscopic sampling tool shown in FIG. 5, the linear portion 42b formed at the tip of the elastic wire 42 bulging from the tip of the flexible tube 1 is arranged 180 degrees inverted toward the rear. Thus, the tip 33 is arranged inside the loop portion 42a.

When the binding member, the tip or the like is projected in front of the loop portion, as shown in FIG. 6, the foreign material 20 chased along the body wall 10 may not reach the loop portion. If there is nothing protruding forward from the tip of 42a, as shown in FIG. 7, foreign matter 20 or the like that is in close contact with body wall 10 can be easily captured in loop portion 42a.

[Advantages of the Invention] According to the endoscopic sampling tool of the present invention, small loop portions are formed at the tips of the elastic wires that bulge in a loop shape, and the small loops are made to intersect each other at the tips, and the intersections are formed. In the section, a binding wire formed in a U shape is passed between adjacent elastic wires, and all the ends of the binding wire are inserted and fixed in one tubular body to bind the tips of the plurality of elastic wires. Therefore, even if the elastic wire is repeatedly expanded and contracted, the bound state is stably maintained and is not damaged, and excellent durability and safety can be obtained.

Further, according to the present invention, even when a super elastic alloy such as a shape memory alloy, which cannot be heated during binding, is used for the elastic wire, the elastic wire can be reliably bound at the tip.

[Brief description of drawings]

FIG. 1 is a perspective view of a tip for bundling elastic wire tips according to a first embodiment of the present invention, FIG. 2 is a perspective view of a tip end portion of a first embodiment of the present invention, and FIG. FIG. 4 is a side sectional view of a tip portion of a second embodiment of the present invention, and FIG. 5 is a side view of a tip portion of another embodiment of the present invention. FIG. 6, FIG. 6 and FIG. 7 are schematic diagrams showing a state in which a foreign substance in a body cavity is collected by the endoscope collecting tool. DESCRIPTION OF SYMBOLS 1 ... Flexible tube, 22 ... Elastic wire, 22a ... Loop part, 22c ... Small loop, 33 ... Tip tip, 33a ...
Bundling wire, 33b ... Bundling tube (tubular body).

Claims (3)

[Scope of utility model registration request] 1. An endoscope extractor in which a plurality of elastic wires are provided so as to be able to move in and out from a distal end of a flexible tube so that the plurality of elastic wires bulge in a loop from the tube, A small loop is formed at the tip of each elastic wire, and these small loops are crossed with each other at their tips, and a binding wire formed in a U shape is passed between adjacent elastic wires at the intersection, and An endoscope sampling tool, characterized in that the ends of the plurality of elastic wires are bound by inserting and fixing all the ends into one tube. 2. The endoscopic sampling tool according to claim 1, wherein the elastic wire is made of a superelastic alloy. 3. The endoscopic sampling tool according to claim 2, wherein the superelastic alloy is a shape memory alloy.