JP2002113011A - Connection part for endo-therapy accessory for endoscope, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection part for an endo-therapy accessory for an endoscope, and a method of manufacturing the same in which a flexible inserting part with an anti-folding coil of metal at a base end can be securely and strongly connected to an operation part not to cause malfunction. SOLUTION: An inner surface part of a hole 15 formed at a tip of the operation part 10 is dissolved, and the anti-folding coil 7 is fixed inside the hole 5 by that. In this method of manufacturing the same, the part of the anti-folding coil 7 is placed in a high frequency field to be heated, and the anti-folding coil 7 is inserted into the hole 15 formed at the tip of the operation part 10. A part of the operation part 10 to get in contact with the anti-folding coil 7 is thus dissolved, thereby the anti-folding coil 7 is fixed inside the hole 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting portion of a treatment instrument for an endoscope and a method of manufacturing the same.

[0002]

2. Description of the Related Art In a treatment instrument for an endoscope in which an operation section is connected to a base end of a flexible insertion section, the flexible insertion section is bent sharply near a connection section with the operation section. In many cases, a bending prevention member is provided at a base end portion of a flexible insertion portion so as not to bend.

[0003] In a treatment instrument using a coil pipe in which a thin metal wire is closely wound with a fixed diameter as a sheath of a flexible insertion portion, a metal coil pipe is widely used also as a buckling member.

[0004] Such a buckling prevention coil is arranged so as to surround a base end portion of a coil pipe forming a sheath, and both base ends are fixed to each other by brazing, soldering or the like.

Therefore, the flexible insertion portion and the operating portion are connected by fixing the buckling coil to the operating portion,
As the connecting means, the tip of a small screw screwed into the operation unit side presses the buckling coil from the side, or the base outer periphery of the buckling coil is placed in the hole formed on the operation unit side with an adhesive. Was joined.

[0006]

However, in the case of a structure in which the folding-prevention coil is pressed from the side by the tip of the small screw screwed into the operation unit side as described above, the tightening of the small screw will occur if the use is repeated. Not only may the connection part loosen and the connecting part may rattle, but if the small screw is excessively tightened too much, the buckling coil may be deformed to open a gap between the coils, which may cause rattling.

Further, when the connecting portion is fixed with an adhesive, the amount of the adhesive increases as a sufficient connecting strength is sought, and the adhesive flows into the inside of the sheath, which tends to cause a malfunction or the like. On the other hand, if the amount of the adhesive is reduced, the joint strength is insufficient, and looseness is likely to occur.

Accordingly, the present invention provides a flexible insertion portion having a metal buckling coil provided at a base end thereof, which can be securely and firmly connected to an operation portion without causing a malfunction or the like. An object of the present invention is to provide a connecting portion of a treatment tool for an endoscope and a manufacturing method thereof.

[0009]

In order to achieve the above-mentioned object, the connecting portion of the treatment instrument for an endoscope according to the present invention has a metal folding coil provided on the outer peripheral portion of the proximal end of the flexible insertion portion. And
An endoscope treatment tool configured so that a flexible insertion portion and an operation portion are connected by fixing a break prevention coil to a hole formed at a tip of an operation portion made of a thermoplastic plastic material. In the connecting portion, the inner surface portion of the hole formed at the tip of the operating portion is melted, thereby fixing the break prevention coil in the hole.

Further, in the method of manufacturing a connecting portion of a treatment tool for an endoscope according to the present invention, a metal buckling coil is provided on an outer peripheral portion of a base end of a flexible insertion portion and is made of a thermoplastic plastic material. A method for manufacturing a connecting portion of a treatment tool for an endoscope, wherein a flexible insertion portion and an operating portion are connected by fixing a buckling coil to a hole formed at a tip of the operating portion. By placing the anti-break coil in a high-frequency magnetic field and heating it, and inserting the anti-break coil into the hole formed at the tip of the operating section, the part of the operating section that contacts the anti-break coil is melted and broken. The stop coil is fixed in the hole.

If the inner diameter of the hole formed at the tip of the operating portion is made smaller than the outer diameter of the buckling coil so that the buckling coil is press-fitted into the hole at the tip of the operating portion, the breaking coil and the The connection state with the operation unit can be further strengthened.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a biopsy forceps for an endoscope, and a flexible sheath 1 inserted through a treatment instrument insertion channel of the endoscope.
Is formed by a coil pipe in which a stainless steel wire is spirally tightly wound with a fixed diameter. Flexible sheath 1
Is a flexible portion 1A having a small strand diameter. 2 is a connection pipe for connecting the coil pipes.

An operating wire 3 is inserted through the entire length of the flexible sheath 1 so as to be able to advance and retreat in the axial direction. A distal end holding frame 4 fixed to the distal end of the flexible sheath 1 has a pair of operating wires. A forceps cup 5 is supported openably and closably about a support shaft 6 in a beak shape.

Reference numeral 10 denotes an operating section for operating the operating wire 3 forward and backward. The rod-shaped operating section main body 11 is formed of a thermoplastic material such as polysulfone, polyphenylene sulfide, or polyether sulfone. I have.

By moving the slider 12 to which the rear end of the operation wire 3 is connected along the operation section main body 11, the operation wire 3 advances and retreats in the axial direction, and the forceps cup 5 opens and closes.

A buckling coil 7 for preventing the flexible sheath 1 from being sharply bent and broken at a portion adjacent to the operation unit 10 is provided so as to surround the outer periphery of the base end of the flexible sheath 1. Have been. The buckling coil 7 is formed of, for example, a coil pipe in which a stainless steel wire is spirally wound to a fixed diameter so as to cover the outside of the flexible sheath 1 loosely.

FIG. 3 shows a state in which the connecting portion of the endoscope treatment tool described above is assembled into a flexible sheath 1 side unit and an operating unit 10 unit in the manufacturing process, and before the two units are connected. The flexible sheath 1 and the buckling prevention coil 7 have their base ends fixed to each other by silver brazing or the like.

A portion where the operation wire 3 extends from the base end of the flexible sheath 1 is provided with a reinforcing stainless steel pipe 3A.
And a connecting piece 3B connected to the slider 12 is fixed to the protruding end.

A hole 15 into which the base end of the buckling coil 7 is fitted is formed in the distal end portion of the operation section main body 11, and the base end of the buckling prevention coil 7 is fitted and fixed in this hole 15. Thus, the flexible sheath 1 side unit and the operation unit 10 unit are fixedly connected.

FIG. 1 shows a step of fitting the base end of the buckling coil 7 into the hole 15 at the distal end of the operating section main body 11 and fixing the same. It is fixed by tools 51 and 52.

A high-frequency current-carrying coil 60 through which a high-frequency current flows is disposed so as to largely surround the hole 15. When a high-frequency current is supplied to the high-frequency current-carrying coil 60, the high-frequency current is generated in the break prevention coil 7 by electromagnetic induction. The folding coil 7 is heated by Joule heat.

Therefore, the heated folding coil 7
Is inserted into the hole 15 so that the portion of the operating portion main body 11 that comes into contact with the break prevention coil 7 (the inner peripheral surface of the hole 15) is melted.
5, the flexible sheath 1 side unit and the operation unit 10
The unit is connected.

The inner diameter of the hole 15 is slightly smaller than the outer diameter of the buckling prevention coil 7 (for example, 0.05 to 0.5 mm).
Approximately) It is formed small and the break prevention coil 7 is
5 so that the anti-bending coil 7 is
5 is press-fitted while heat melting the inner peripheral surface of the flexible sheath 1.
The connection state between the side unit and the operation unit 10 unit becomes stronger.

The present invention is not limited to the above embodiment. For example, the present invention is applicable to various endoscope treatment tools other than biopsy forceps.

[0025]

According to the present invention, the inner surface of the hole formed at the distal end of the operating portion is melted, thereby fixing the anti-folding coil in the hole, so that the anti-folding coil is provided at the base end. The flexible insertion part can be securely and firmly connected to the operation part so as not to cause malfunctions, etc., and if the metal break prevention coil part is heated by placing it in a high frequency magnetic field, it will be connected. The work can be performed very reliably and easily.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a step of connecting a sheath-side unit and an operation unit of an endoscope biopsy forceps according to an embodiment of the present invention.

FIG. 2 is a side view of an endoscope biopsy forceps according to the embodiment of the present invention.

FIG. 3 is a side view of a sheath-side unit and an operation unit of the endoscope biopsy forceps according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible sheath 7 Bending prevention coil 10 Operation part 11 Operation part main body 15 hole 60 High frequency energizing coil

Claims (3)

[Claims] An anti-folding coil made of metal is provided on the outer peripheral portion of a proximal end of a flexible insertion portion, and the anti-folding coil is fixed to a hole formed at a distal end of an operation portion made of a thermoplastic plastic material. By dissolving the inner surface portion of the hole formed at the distal end of the operating portion, in the connecting portion of the endoscope treatment tool configured so that the flexible insertion portion and the operating portion are connected. ,
The connecting part of the treatment tool for an endoscope, wherein the folding coil is fixed in the hole. 2. A metal buckling coil is provided on the outer periphery of a base end of a flexible insertion portion, and the buckling coil is fixed to a hole formed at a distal end of an operation portion made of a thermoplastic plastic material. Thereby, in the method of manufacturing a connecting portion of the treatment tool for an endoscope configured to connect the flexible insertion portion and the operating portion, by placing the anti-bending coil portion in a high-frequency magnetic field By heating and inserting the break prevention coil into the hole formed at the tip of the operation section, the portion of the operation section that contacts the break prevention coil is melted and the break prevention coil is fixed in the hole. A method of manufacturing a connecting portion of a treatment tool for an endoscope, wherein 3. The endoscope according to claim 2, wherein the inner diameter of the hole formed at the tip of the operating portion is smaller than the outer diameter of the buckling coil, and the buckling coil is press-fitted into the hole at the tip of the operating portion. A method for manufacturing a connecting portion of a mirror treatment tool.