JPH07408A - Flexible tube of treatment jig for endoscope - Google Patents

Abstract

PURPOSE:To provide the subject flexible tube changed in flexibility on the way thereof, low in production cost and excellent in durability. CONSTITUTION:In the flexible tube of the treatment jig for an endoscope formed into a coil pipe shape wherein a strand composed of an elastic wire material is densely wound, the strand is so formed as to have the same cross-sectional shape over the total length thereof and the diameter thereof is changed on the way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible tube for an endoscopic treatment tool which is used by being inserted into a forceps channel or the like of an endoscope.

[0002]

2. Description of the Related Art As a flexible tube for a treatment instrument for endoscopes, generally, a wire made of an elastic wire such as a stainless steel wire is formed into a coil pipe in a tightly wound manner.

However, since the distal end portion needs to be bent at the distal end of the endoscope insertion portion with a small radius of curvature by a treatment instrument raising base or the like, it has high flexibility (that is, is flexible), On the hand side, the waist needs to be strong (that is, hard) so as not to buckle due to an operation such as pushing and pulling.

Therefore, conventionally, a coil pipe having a small wire diameter is connected to the tip of a coil pipe having a large wire diameter via a metal pipe, or only the tip side of a coil pipe having a uniform wire diameter is The flexibility is enhanced by annealing by heat treatment to make it soft, or by grinding only the outer surface on the tip side to thin the wire.

[0005]

However, connecting two coil pipes with a metal pipe or the like requires a considerable number of man-hours for processing the parts and assembling, and the cost is high, and only the connecting portion is bent. Since it has no rigid part, it has a drawback that it is easily damaged near the connecting part while it is repeatedly bent during use.

Further, if only the tip end side of the coil pipe is annealed or ground, the heat treatment and the grinding cost processing costs, and the strength of that part is significantly reduced by the processing, and there is a drawback that it is easily damaged.

Therefore, the present invention provides a flexible tube of which the flexibility is changed on the way, which is low in manufacturing cost and excellent in durability, as a treatment tube for an endoscope. To aim.

[0008]

In order to achieve the above-mentioned object, a flexible tube of a treatment instrument for an endoscope of the present invention is an endoscope in which an element wire made of an elastic wire is formed in a coil pipe shape of a tight winding. In the flexible tube of the treatment tool for a mirror, the strand is formed to have the same cross-sectional shape over the entire length, and the strand diameter is changed midway.

[0009]

Embodiments will be described with reference to the drawings. Figure 2
1 shows a biopsy forceps generally used as an endoscopic treatment tool, for example, a distal end of a flexible tube 1 formed in a coil pipe shape by closely winding a wire made of an elastic wire material such as a stainless steel wire. A pair of forceps cups 3 that are opened and closed by the link mechanism 2 are attached to the.

An operating portion 4 is connected to the proximal end side of the flexible tube 1, and an operating wire (not shown) inserted through the flexible tube 1 by moving a slider 5 of the operating portion 4 forward and backward. The forceps cup 3 is opened and closed.

FIG. 1 shows an enlarged cross section of the flexible tube 1, and the operation wire inserted through the inside is not shown. As shown in this figure, the wire of the flexible tube 1 is formed in a circular cross section over the entire length, and the wire diameter changes in the middle, and the tip end side of the flexible tube 1 has a small wire diameter. The part is used, and the other parts have thicker wire diameters.
The flexible tube 1 is tightly wound so that the outer diameter of the flexible tube 1 is uniform over the entire length.

Therefore, in the flexible tube 1, only the tip side portion having a small wire diameter has high flexibility and is flexible, and the other thick portion having a wire diameter has a high rigidity. And since the strands have the same cross-sectional shape over the entire length, the drawn material can be used as it is, the part cost is low, there are no joints in the middle, and heat treatment and grinding are not required, so the manufacturing cost is low No reduction in strength occurs.

FIG. 3 shows a second embodiment of the flexible tube 1 of the present invention, in which the inner diameter of the coil pipe is closely wound so as to have a uniform diameter over the entire length. As described above, the present invention is not limited to the embodiments, and can be applied to the flexible tubes of various endoscopic treatment tools other than the biopsy forceps.

[0014]

According to the flexible tube of the endoscopic treatment tool of the present invention, the strands are formed in the same cross-sectional shape over the entire length and the diameter of the strands is changed on the way to form a tightly wound coil pipe. Since it is formed in the above, the flexibility can be easily changed on the way, and it can be manufactured at a low cost, and the strength is not lowered by the processing, and the durability is excellent.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment of a flexible tube of a treatment instrument for an endoscope.

FIG. 2 is a side view of the endoscopic biopsy forceps.

FIG. 3 is a side sectional view of a second embodiment of the flexible tube of the treatment instrument for endoscope.

[Explanation of symbols]

 1 flexible tube

Claims (1)

[Claims] 1. A flexible tube of a treatment instrument for an endoscope, in which a wire made of an elastic wire is formed into a coil pipe shape of tight winding.
A flexible tube for a treatment instrument for an endoscope, characterized in that the strand is formed to have the same cross-sectional shape over the entire length and the diameter of the strand is changed on the way.