JPH10277047A - Treating implement for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sheath from buckling due to operating force in a thrusting direction by burying a coil sheath obtained by tightly winding a metallic wire through nearly the full length of the inside of the resin layer of a flexible sheath and making the outer peripheral face and the inner peripheral face of the resin layer smooth surfaces. SOLUTION: Exploratory biopsy forceps 1 are provided with the flexible sheath 2 introduced into a celom by inserting into an insertion channel of an endoscope and an operation part 3 is connected to the base tip of the sheath 2 to be covered with a fold-stopping tube 4. The sheath 2 is obtained by melt- fitting an inner layer 17 to the inner peripheral face of the coil sheath 16 obtained by tightly winding the metallic wire and melt-fitting an outer layer 18 to the outer peripheral face of the coil sheath 16. The inner layer 17 is formed in the shape of a tube, the inner wall of the inner layer 17 is a smooth surface and the surface of the inner layer 17 is also formed to be a smooth surface. Thereby the deformation of the sheath against the operating force in the thrusting direction is reduced to make the sheath difficult to buckling when operating force is added in the thrusting direction and to improve the washability of the sheath.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment tool for an endoscope which is used by being inserted into an insertion channel of an endoscope and introduced into a body cavity.

[0002]

2. Description of the Related Art Generally, a treatment instrument for an endoscope includes an elongated sheath which is inserted into an insertion channel of the endoscope and introduced into a body cavity. For example, in a treatment tool such as a biopsy forceps, when the operation wire is pulled during use, a considerably strong operation force in a thrust direction is applied to the sheath. For this reason, when the sheath is merely a resin tube, the amount of deformation in the thrust direction when a traction force is applied by the operation wire is large, and as a result, the operation force is not sufficiently transmitted to the treatment portion provided at the distal end of the sheath. Tube cannot be used.

Therefore, a sheath 31 made of a close-wound coil as shown in FIG. 4 is used. In the case of such a sheath 31 made of a close-wound coil, the amount of deformation with respect to the operation force in the thrust direction when the operation wire 32 is pulled is small and it is difficult to buckle. We can fully tell department.

In Japanese Unexamined Utility Model Publication No. 4-47402 and Japanese Unexamined Patent Application Publication No. 5-95892, a metal wire is roughly spirally wound around the outer peripheral surface of an inner tube made of resin, and the resin is melt-extruded outside these. There has been proposed a medical tube in which the tube wall is formed to be thin by covering the tube. This is used only as a medical tube, and is not used for a sheath of an endoscopic treatment instrument such as a biopsy forceps because the coil pitch of a metal wire is coarse. When used for the sheath of the treatment instrument, the amount of deformation with respect to the force in the thrust direction is greatly buckled, and as a result, the operating force is not sufficiently transmitted to the treatment section provided at the distal end of the sheath of the biopsy forceps. Therefore, the medical tubing proposed in Japanese Utility Model Laid-Open No. 4-47402 and Japanese Patent Laid-Open No. 5-95892 is not suitable for a sheath of a treatment tool for an endoscope.

[0005]

[Problems to be solved by the invention]

(Problems of the prior art) The sheath of the conventional treatment instrument for an endoscope is formed of a tightly wound coil, and such a sheath has irregularities and gaps on its surface. There is a drawback that dirt and the like easily adhere, and once the body fluid and the dirt and the like adhere, they are difficult to drop. The medical tubing proposed in Japanese Utility Model Laid-Open Publication No. 4-47402 and Japanese Patent Laid-Open Publication No. 5-95892 has a large deformation amount with respect to a thrust direction force and is easily buckled. Not suitable for sheaths.

(Object of the present invention) The present invention has been made in view of the above-mentioned problems. The object of the present invention is to reduce the amount of deformation of the sheath with respect to the operating force in the thrust direction, An object of the present invention is to provide a treatment tool for an endoscope in which a sheath is hardly buckled when an operation force is applied, and in particular, the sheath has an improved cleaning property.

[0007]

Means and Action for Solving the Problems

(Means) The present invention relates to a treatment instrument for an endoscope having a flexible sheath, wherein the flexible sheath has a coil sheath in which a metal wire is closely wound over substantially the entire length inside a resin layer,
The outer peripheral surface and the inner peripheral surface of the resin layer are formed on a smooth surface. (Operation) The resin is melted on the inner and outer peripheral surfaces of the tightly wound coil sheath, so that the cleaning property is improved while maintaining a structure that does not buckle.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A biopsy forceps according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory view schematically showing the entire biopsy forceps, and FIG. 2 is an enlarged sectional view of a portion A in FIG.

(Structure) The treatment tool for an endoscope according to the first embodiment relates to the biopsy forceps 1. As shown in FIG. 1, the biopsy forceps 1 includes a flexible sheath 2 that is inserted into an insertion channel of an endoscope and is introduced into a body cavity. Are linked. A stopper tube 4 is mounted on the proximal end portion of the sheath 2.

The operating portion 3 has an operating portion main body 6 formed of a rod-shaped member. A slider 7 is slidably mounted on the outer peripheral portion of the operating portion body 6. The slider 7 is provided with a wire stopper 8. The proximal end portion of the operation wire 9 inserted into the sheath 2 is connected and fixed to the slider 7 by the wire stopper 8. At the rear end of the operation section main body 6, a finger hanging ring section 11 for hanging a thumb is formed. On the slider 7, a finger hanging ring section 12 for hanging an index finger and a middle finger of the hand is formed.

A distal tip 13 is attached to the distal end of the sheath 2, and the distal tip 13 has a pair of biopsy cups 14.
a and 14b are provided pivotally. The distal end of the operation wire 9 is connected to the pair of biopsy cups 14a and 14b via an opening / closing link mechanism (not shown). And
The biopsy cups 14a and 14b are closed by sliding the slider 7 to pull the operation wire 9, and the biopsy cups 14a and 14b are opened by sliding the slider 7 and pushing the operation wire 9 similarly. It has become.

The sheath 2 is constructed as shown in FIG. That is, a coil sheath 1 in which a metal wire is closely wound.
6, the inner layer 17 is melted and attached to the inner peripheral surface, and the outer layer 18 is melted and attached to the outer peripheral surface of the coil sheath 16. The inner layer 17 has a tubular shape, the inner wall of the inner layer 17 has a smooth surface, and the surface of the outer layer 18 has a smooth surface.

As a material for forming the inner layer 17 and the outer layer 18, a resin whose main component has a certain degree of flexibility, for example, polyethylene, polyester, polypropylene, polymethylpentene, polyisoprene, polybutadiene, polybutene, polyamide, polyacetal, polyurethane, Although the inner layer 17 and the outer layer 18 are not necessarily made of the same material, they are made of vinyl chloride, fluororesin, latex, silicon, isoprene, neoprene, natural rubber, or a mixed material thereof.

(Operation) The above-mentioned sheath 2 has a structure in which a coil in which a metal wire is densely wound is buried in the resin layer composed of the inner layer 17 and the outer layer 18 over substantially the entire length thereof, so that it does not easily buckle. In addition, each surface of the inner wall and the outer wall of the sheath 2 is a smooth surface, and the body fluid, dirt, and the like hardly adhere, even if they adhere, easily fall off, and the cleaning property is improved.

(Effect) Since the cleaning property is improved, the inner wall and the outer wall of the sheath 2 can be kept clean, and it is possible to easily prevent infections such as viruses and bacteria which are harmful to the human body.

[Second Embodiment] A sheath in a biopsy forceps according to a second embodiment of the present invention will be described with reference to FIG. (Configuration) Sheath 2 in biopsy forceps according to this embodiment
Is a tube in which an inner layer is formed by attaching a tube 21 to the inner peripheral surface of the coil sheath 16 that is closely wound, and an outer layer is formed by attaching a tube 22 to the outer peripheral surface of the coil sheath 2.
The materials of the tubes 21 and 22 may be the same as those in the first embodiment, but the materials of the tubes 21 and 22 are not necessarily required to be the same. Other configurations are the same as those of the above-described first embodiment, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

(Operation) This is the same as the first embodiment. (Effects) In addition to the effects of the first embodiment, the manufacture is facilitated.

<Appendix> According to the above description, the following items can be obtained. 1. In the treatment instrument for an endoscope having a flexible sheath, the flexible sheath embeds a coil sheath in which a metal wire is tightly wound over substantially the entire length of the inside of the resin layer, and the outer peripheral surface and the inner peripheral surface of the resin layer are An endoscope treatment tool characterized by being formed on a smooth surface. 2. The endoscope treatment tool according to Item 1, wherein the resin layer has an inner layer attached to the inner peripheral surface of the coil sheath and an outer layer attached to the outer peripheral surface of the coil sheath. 3. Item 1 is the endoscope treatment tool according to Item 1, wherein the resin layer includes a tube attached to the inner peripheral surface of the coil sheath and a tube attached to the outer peripheral surface of the coil sheath.

[0019]

As described above, according to the present invention, while the sheath does not easily buckle when an operating force in the thrust direction is applied, body fluids and dirt are less likely to adhere to the surface thereof. Even if adhered, it easily falls off, and the cleaning property is improved. Further, since the bodily fluid, dirt, and the like are less likely to adhere and the cleaning property is improved, the inner and outer walls of the sheath can be kept clean. Therefore, it is possible to easily prevent infection of the human body with viruses, bacteria, and the like. Further, it is possible to reduce the time used for cleaning and the cleaning cost.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an entire biopsy forceps according to a first embodiment.

FIG. 2 is an enlarged sectional view of a portion A in FIG.

FIG. 3 is a longitudinal sectional view of a part of a sheath in a biopsy forceps according to a second embodiment.

FIG. 4 is a longitudinal sectional view of a part of a sheath in a conventional biopsy forceps.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Biopsy forceps, 2 ... Flexible sheath, 3 ... Operation part, 6 ... Operation part main body, 7 ... Slider, 16 ... Coil sheath, 17 ...
Inner layer, 18 ... Outer layer.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masatoshi Tomura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Yoshio Konuki 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Inside Olympus Optical Kogyo Co., Ltd. (72) Inventor Akito Sadamasa 2-34-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Kogyo Co., Ltd. (72) Inventor Yukio Sato 2-chome Hatagaya, Shibuya-ku, Tokyo No. 43-2 Inside Olympus Optical Kogyo Co., Ltd. (72) Inventor Koichi Shimizu 2-chome Hatagaya 2-chome, Shibuya-ku, Tokyo (72) Inventor Kiyotaka Matsuno 2-chome Hatagaya, Shibuya-ku, Tokyo 43-2, Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. An endoscope treatment instrument having a flexible sheath, wherein the flexible sheath has a coil sheath in which a metal wire is tightly wound around the entire length of the resin layer, and an outer peripheral surface of the resin layer. And a treatment tool for an endoscope, wherein the inner peripheral surface is formed on a smooth surface.