JPH0647450Y2 - Stone crushing tool for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a calculus breaking tool for an endoscope which is inserted into a forceps channel of an endoscope and is used for crushing a calculus in a body cavity. is there.

[Prior Art] This type of endoscopic calculus breaking tool pushes out a plurality of elastic wires from the tip of a flexible tube to swell them, and after capturing the calculi in the elastic wires, the elastic wires can be attached. It is designed to be strongly drawn into the flexible tube to reduce the bulging diameter of the elastic wire, thereby crushing the calculi therein.

Specifically, as shown in FIG. 6, for example, the operation wire 92 is inserted into the flexible tube 91 so that the operation wire 92 can advance and retreat, and a plurality of pieces (for example, four pieces) are bulged like a basket from the flexible tube 91. ) The proximal end portion of the elastic wire 93 and the distal end portion of the operation wire 92 are passed through the joint pipe 94 and fixedly connected by silver brazing or the like. Reference numeral 95 is a tip chip that bundles the tip portions of a plurality of elastic wires 93 into one, and is also fixed to the elastic wires 93 by silver brazing or the like.

In the calculus breaking tool for an endoscope having such a configuration, conventionally, the elastic wires 93 are formed to have the same length.

[Problems to be solved by the device]

However, if each elastic wire 93 is formed to have the same length, the same amount of load is applied to each elastic wire 93 when a calculus is trapped in the swollen elastic wire 93 and the operation wire 92 is strongly pulled. Therefore, when the calculus is hard and cannot be easily crushed and the elastic wires 93 are cut, all the elastic wires 93 are cut at the same time. When the elastic wires 93 are not cut, all the elastic wires 93 are connected.
It may come off from 94 or the operation wire 92 may be cut.
In each case, the elastic wire 93 has a defect that it falls into the body cavity of the patient.

An object of the present invention is to provide a safe calculus crushing tool for an endoscope which eliminates the above-mentioned drawbacks of the related art and prevents the elastic wire portion from dropping into the body cavity of a patient.

[Means for Solving the Problems]

In order to achieve the above object, the calculus crushing tool for an endoscope of the present invention is provided with a plurality of elastic wires that can be inserted into and removed from the tip of a flexible tube, and if the elastic wires are pushed out of the tube, they form a basket. A calculus breaking tool for an endoscope in which the expanded diameter is reduced by expanding and retracting the elastic wire into the tube, wherein the length of at least one wire of the plurality of elastic wires is long. The elastic wire is shorter than other elastic wires.

[Action]

When a calculus is captured in an elastic wire that bulges like a basket from the tube and the elastic wire is strongly pulled into the tube, a strong load is applied to the elastic wire having a short length. Therefore, when a strong force is applied to break the wire, only the elastic wire having a short length cuts.

〔Example〕

 An embodiment will be described with reference to the drawings.

In FIG. 1, 1 is a flexible tube made of, for example, tetrafluoroethylene resin, in which a thick operation wire 2 is inserted so as to be able to move forward and backward over substantially the entire length. 1a
Is a metal base attached to reinforce the tip portion of the flexible tube 1. The operation wire 2 can be driven back and forth by an operation unit (not shown) connected to the base side (right side in FIG. 1) of the flexible tube 1.

A plurality (for example, 4
The bases of the elastic wires 4, 5, 6 and 7 are connected to each other by bundling and fixing, for example, with silver brazing. Three of the four elastic wires 4, 5 and 6 are formed to have the same length, and the remaining one elastic wire 7 is formed to be shorter than the other elastic wires. The tips of 6, 7 are bound and fixed to a tip tip 8 made of metal, for example, by silver brazing. As the elastic wire, either a twisted wire or a single wire can be used.

As shown in FIG. 2, the elastic wires 4, 5, 6, 7 are arranged at equal intervals, that is, at 90 ° intervals, and bulge like a cage when extruded from the tip of the flexible tube 1. So that each,
A dogleg-shaped bend is formed at several points along the way.

Therefore, when the operation wire 2 is pushed from the operation portion side to the tip side, the elastic wires 4,5, 6, 7 are pushed out from the tip of the flexible tube 1 and, as shown in FIG. 1 and FIG. It bulges like a basket. If you pull the operation wire 2 toward the operation section,
The elastic wires 4,5,6,7 are drawn into the flexible tube 1 to reduce the bulged diameter.

When crushing a calculus, as shown in FIG. 3, the flexible tube 1 is inserted into the forceps channel of the endoscope 20. Then, the calculus 30 is captured in the elastic wires 4,5, 6, 7 that bulge like a basket from the tip of the flexible tube 1, and the operating wire 2 is strongly pulled toward the operating portion. Then, the elastic wire 7 having a shorter length is subjected to a larger tensile load than other elastic wires.

Therefore, for example, when the calculus 30 is very hard and the calculus 30 is not crushed by normal force, the short elastic wire 7 is cut as shown in FIG.
As a result, as shown in FIG. 5, the calculus 30 falls off from the elastic wires 4,5,6,7, so that the elastic wires 4,5,6,7 are pulled into the flexible tube 1, It can be pulled out from the forceps channel of the endoscope.

[Effect of device]

According to the calculus crushing tool for an endoscope of the present invention, when a strong force that damages the elastic wire is applied, only the wire having a short length is cut, so that the elastic wire may fall into the body cavity of the patient. It has an excellent effect that it is eliminated and the safety is greatly improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a tip portion thereof, FIGS. 3 to 5 are side views of the usage state of the embodiment, and FIG. 6 is a conventional example. It is a side sectional view. 1 ... Flexible tube, 2 ... Operation wire, 3 ... Joint pipe, 4, 5,
6,7… elastic wire, 30… stone.

Claims (1)

[Scope of utility model registration request] 1. A plurality of elastic wires are provided so as to be freely inserted and withdrawn from the tip of a flexible tube, and when the elastic wires are pushed out from the tubes, they expand in a cage shape, and when the elastic wires are pulled into the tubes, In the calculus breaking tool for an endoscope in which the bulging diameter of the elastic wire is reduced, at least one wire of the plurality of elastic wires is formed to have a length shorter than other elastic wires. Stone crushing tool for endoscopes.