JPH0197446A - Sampler for endoscope - Google Patents

Abstract

PURPOSE:To always stably form a large loop in spite of the repeated taking in and out through a tube, by forming an elastic wire so as to expand the same into a figure of 8-shape wherein the diameter of the loop on the leading end side thereof becomes small. CONSTITUTION:In an elastic wire 4 alone, the central part of the straightly stretched wire is rotated by 360 deg. to form a small loop 4a. Both ends of this wire is fixed to a connection pipe 3 to form a figure 8-shape wherein the diameter of the loop 4a on the leading end side thereof becomes small. The small loop 4a may have an oval shape other than a regular circular shape. When the elastic wire 4 is drawn in a flexible tube 1, the part of a large loop 4b is collapsed in the flexible tube 1 but, since the wire is gently deformed within a long range A extending from the small loop 4a to the large loop 4b, no plastic deformation is generated. Therefore, when the elastic tube 4 is pushed out from the flexible tube 1, the large loop is always formed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an endoscope collection tool that is inserted into a forceps channel of an endoscope and used to collect foreign objects in a body cavity. be.

[Prior Art] This type of endoscope collection tool is designed to extrude an elastic wire from the tip of a flexible tube to bulge out, and trap foreign objects in the elastic wire. It is necessary to have the ability to inflate as much as possible, and to have the ability to always inflate sufficiently outside the tube due to the restoring force even if it is drawn into a narrow flexible tube for a long time.

Therefore, conventionally, as shown in FIG. 1θ, for example, an operating wire 22 is inserted into a flexible tube 21 so as to be freely advanced and retracted, and a bent portion 24 is formed on the distal end side of an elastic wire 23 connected to the operating wire 22. The entire wire was inflated into a cage shape, and the elastic wire 23 was made to have a large bulge and a restoring force.

[Problems to be Solved by the Invention] In order to form a large loop with an elastic wire, in the conventional method described above, the bent portion 24 must be bent at an angle close to a right angle. However, when the bent portion 24 is drawn into the tube, the angle of the bent portion 24 widens to an obtuse angle and is plastically deformed, resulting in insufficient restorability and the formation of a large loop, as shown in FIG. There was a drawback that it became impossible to do so. The elastic wire 23 may even break at that portion due to fatigue.

Further, when the elastic wire 23 is pushed out partway from the tube 21, the elastic wire 23 does not expand at all as shown in FIG. 12, and there is a drawback that a loop with a small diameter cannot be formed.

This invention eliminates such conventional drawbacks, and even if the elastic wire is repeatedly put in and out of the tube, it can always form a large loop stably, and can be made into an appropriate size as needed. It is an object of the present invention to provide an endoscope collection tool that can arbitrarily form a loop.

[Means for Solving the Problems] To solve the above-mentioned problems, an endoscope collection device according to the present invention includes a flexible tube, and an operation wire inserted into the tube so as to be freely retractable. , an endoscope collection tool comprising an elastic wire connected to the operation wire so as to be able to enter and exit from the tip of the tube and inflated in a loop shape outside the tube, the elastic wire comprising:
It is characterized by being formed so that when it is extruded from the tube, it bulges out into a figure 8 shape with a smaller diameter loop on the distal end side.

[Function] When the elastic wire is pushed out of the flexible tube,
The elastic wire has a smaller diameter loop at the distal end.
Form a figure 8 loop.

Then, if you pull the elastic wire into the flexible tube, 1
The elastic wire is gently deformed and dipped over a long range, and is housed in the tube. Therefore, since the elastic wire does not undergo plastic deformation and always maintains its resilience, a loop of the original size can be formed by pushing the elastic wire out of the flexible tube.

Further, when the elastic wire is partially extruded from the flexible tube, a loop is formed in a size corresponding to the length of extrusion.

[Example] FIG. 1 shows an endoscope collection device according to a first example of the present invention, in which l is a flexible tube made of, for example, tetrafluoroethylene resin, Inside it is the operation wire 2.
is inserted so that it can move forward and backward. On the proximal end side of the flexible tube I, there is a known operation section (
(not shown) are connected.

A connecting tube 3 is connected to the tip of the operating wire 2.

An elastic wire 4 made of, for example, a stranded wire or a single stainless steel wire is connected. Note that if a so-called superelastic alloy (a type of shape memory alloy made of old-Ti alloy) is used as the material of the elastic wire, excellent restorability can be obtained. The respective ends of the operating wire 2 and the elastic wire 4 are inserted into the connecting tube 3 from both sides and are fixed to the connecting tube 3 by brazing, for example. Incidentally, a metal coil or the like may be used as the connecting pipe 3, and the operating wire 2 and the elastic wire 4 may be continuously formed using a wet wire.

The elastic wire 4 alone is formed into a shape as shown in FIG. That is, rotate the center part of the straight wire 360 degrees and insert a small loop 4 there.
a is formed. By fixing both ends of this wire to the connecting tube 3, the shape shown in FIG.
A character 8" shape is formed. 4b shows the larger loop. Note that the small loop 4a does not have to be perfectly circular, and may be oval or elliptical.

While FIG. 1 above shows the elastic wire 4 pushed out from the flexible tube 1, FIG. 3 shows the elastic wire 4 pulled into the flexible tube 1. . In this state, the large loop 4b1 of the elastic wire 4 is crushed within the flexible tube l, but the elastic wire 4 is gently deformed in a long range A extending from the small loop 4a to the large loop 4b. No plastic deformation occurs.

In other words, the elastic wire 4 is deformed within the elastic region within the tube l, and if the elastic wire 4 is pushed out from within the flexible tube 1, a large loop as shown in FIG. 1 is always formed. .

FIG. 4 shows a state in which the elastic wire 4 has been pushed out part way from the flexible tube 1. A force acting on the large loop portion 4b of the elastic wire to return it to the straight line state shown in FIG. 2 is applied in a balanced manner to the entire wire. Therefore, in a state where the elastic wire 4 is pushed out halfway from the flexible tube l, the large loop portion 4b has a length L
It forms a shape close to a circle with a diameter approximately proportional to .

FIG. 5 shows a second embodiment of the present invention, in which an elastic wire 4
2 trees, shifted 90 degrees. In this way, in the present invention, the number of elastic wires 4 is one, two or three.
It may be more than a book. When two elastic wires 4 are provided, a distal tip 6 having a cross-shaped groove 5 as shown in FIG. 6 is inserted into the small loop portion of the elastic wire as shown in FIG. It may be fixed to the head of the elastic wire 4a. By doing so, there will be no deviation in the mutual positional relationship of the two elastic wires 4.

Figure 8 shows two elastic wires 14 arranged 90 degrees apart.
Two small loop portions 14a are continuously formed at the tips of each of the tips, and the small loop portions 14a at the tip end are fixed to each other with a tip 16. Small loop part 14a
When fixing them together, use the small loop part 14 like this.
By continuously forming a plurality of a, reliable restorability can be obtained.

Incidentally, a cap 7 may be attached to the tip of the flexible tube l as shown in FIG. 9. By doing so, the flexible tube l will not be damaged by the elastic wire. You will not be able to do it.

The structure of the present invention is also effective as a Takaoka wave snare for endoscopes.

[Effects of the Invention] According to the endoscope collection tool of the present invention, when the elastic wire is drawn into the flexible tube, the elastic wire is gently deformed and crushed over a long range, causing plastic deformation. Therefore, it is possible to always maintain resilience and form a stable large loop. Furthermore, when a portion of the elastic wire is extruded from a flexible tube, a loop of a size corresponding to the extrusion length is formed, so by changing the extrusion length, the appropriate size of the fire can be created. can be formed arbitrarily.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a side view of an elastic wire used in the embodiment, and Fig. 3 is a state in which the elastic wire of the embodiment is drawn into a flexible tube. FIG. 4 is a side view of the elastic wire of the embodiment partially extruded from the flexible tube, FIG. 5 is a side view of the second embodiment of the present invention, and FIG. is a perspective view of the tip, FIG. 7 is a partial side view of the tip attached to the tip of the elastic wire, FIG. 8 is a side view of the third embodiment of the present invention, and FIG. 9 is a partial side view of the tip attached to the tip of the elastic wire. A side cross-sectional view of the flexible tube with the cap attached to the tip, Figures 10 to 12 show a conventional endoscope collection device, and Figure 10 shows the elastic wire pushed out from the flexible tube. State side view, 11th
The figure is a side cross-sectional view of the elastic wire drawn into the flexible tube, and FIG. 12 is a cross-sectional view of the elastic wire partially pushed out from the flexible tube. 1... Flexible tube, 2... Operation wire, 4, 1
4...Elastic wire, 4a, 14a...Small loop part, 4b...Large loop part. Agent Patent Attorney Kazuhiko Mitsui Figure 1 Figure 2 Figure 5 Figure 8

Claims (5)

[Claims] (1) A flexible tube, an operating wire inserted into the tube so as to be freely retractable, and connected to the operating wire so as to be able to go in and out from the tip of the tube, and formed to swell into a loop outside the tube. In the endoscopic collection tool made of an elastic wire, the elastic wire is configured such that when pushed out of the tube, the elastic wire bulges out into a figure-eight shape with a smaller diameter loop on the distal end side. An endoscope collection tool characterized by having a shape. (2) The endoscope collection device according to claim 1, wherein a plurality of the elastic wires are provided. (3) The endoscope sampling tool according to claim 2, wherein the plurality of elastic wires are fixed to each other at a small loop portion at the tip. (4) The endoscope according to claim 3, wherein a plurality of the small loop portions are successively provided at the distal end of each of the elastic wires, and the foremost small loop portions are fixed to each other. Mirror collection tool. (5) The endoscope collection device according to any one of claims 1 to 4, wherein the elastic wire is made of a superelastic alloy.