JPH11169377A - Endoscope treatment tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively restrict the adhesion of filth and achieve a linear retainability and a resistance to compression by covering both internal and external surfaces of a coil pipe with a metal fine wire spirally wound watertight with a flexible tube to form a flexible sheath which is detachably inserted into a treatirg device insertion channel of an endoscope. SOLUTION: In hot biopsy forceps for an endoscope which has a tip treating part 200 equipped with a pair of tissue sampling cups 201 free to open or close as treating device for an endoscope and allows feeding of the cups 201 with a high frequency current, the pair of tissue sampling cups 201 is driven to open or close through a link mechanism 205 by the operation of advancing or retracting an operation wire 204 inserted through a sheath 1. To form the sheath, the internal and external surfaces of a coil pipe 11 with a stainless steel wire spirally wound closely to a specified diameter are covered watertight with flexible tubes 13 and 12. The flexible tubes herein used are made of a fluororesin, polyethylene or the like having an electrically insulating property.

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 and removed from a treatment tool insertion channel of an endoscope.

[0002]

2. Description of the Related Art In general, a treatment instrument for an endoscope is provided with a treatment member at a distal end of a flexible sheath inserted into and removed from a treatment instrument insertion channel of the endoscope, and an operation wire inserted through the sheath is sheathed. It is configured to operate the distal end treatment member by towing operation from the operation unit connected to the proximal end of the front end.

[0003] A tightly wound coil pipe is widely used as such a flexible sheath. The tightly wound coil pipe has good straightness retention while having flexibility,
Excellent sniper ability for the target can be obtained. Also,
Since it has excellent compression resistance without shrinking in the axial direction, it is suitable for use as a sheath of a treatment tool to which a strong force is applied when pulling an operation wire.

[0004] However, since the coil pipe has no electrical insulation and poor surface slippage, a sheath of the coil pipe is used as a sheath of a treatment instrument using a high-frequency current or a treatment instrument in which low insertion resistance is important. An outer surface coated with a flexible tube is used.

[0005]

However, the sheath having such a structure in which the outer surface of the coil pipe is covered with the flexible tube is very difficult to clean dirt attached to the inner coil pipe after use. In order to completely avoid the problem of hygiene, it has to be disposable, which has a disadvantage that the economic efficiency is extremely low.

Accordingly, the present invention provides a sanitary endoscope treatment tool which maintains the advantages of the coil pipe, such as flexibility, straightness retention and compression resistance, and which does not adhere dirt to the coil pipe during use. The purpose is to:

[0007]

Means for Solving the Problems To achieve the above object, an endoscope treatment tool according to the present invention has an endoscope having a flexible sheath which is inserted into and removed from a treatment instrument insertion channel of the endoscope. In the treatment instrument, the sheath is formed by covering a flexible tube in a watertight state on both the inner and outer surfaces of a coil pipe formed by spirally winding a thin metal wire with a substantially constant diameter. And

It is preferable that an operation wire is inserted into the sheath so as to be able to advance and retreat in the axial direction, and that the operation wire can be inserted into and removed from the sheath. A treatment member is attached to and detached from the distal end of the sheath. It may be freely attached.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a treatment tool for an endoscope according to a first embodiment of the present invention, and shows a state in which an operation unit has been removed from a proximal end (base end) of a sheath 1.

The treatment instrument for an endoscope is a hot biopsy forceps for an endoscope in which a high-frequency current can be passed through a tissue sampling cup 201 of a biopsy forceps. A pair of tissue collection cups (tip treatment members) 201 rotatably supported by a tip body 203 by 202 are connected to the tip side of a link mechanism 205 driven by the advance / retreat operation of the operation wire 204.

The operation wire 204 is formed of, for example, a stranded wire of stainless steel wire, and its tip is fixed and connected to a wire connection 206 connected to the rear end of the link mechanism 205 by brazing or soldering. And is disposed in the sheath 1 so as to be able to advance and retreat in the axial direction.

With such a configuration, the distal treatment section 200
By moving the operation wire 204 in the axial direction in a state where is connected to the sheath 1, the link mechanism 205 is driven to open and close the tissue collection cup 201.

The sheath 1 inserted into and removed from the treatment instrument insertion channel of the endoscope is formed by winding a stainless steel wire spirally in close contact with a substantially constant diameter to form an inner and outer surface of a tightly wound coil pipe 11. The flexible tubes 13 and 12 are provided in a watertight manner. As the flexible tubes 13 and 12, a fluororesin tube or a polyethylene tube having electrical insulation can be used.

The outer flexible tube 12 is provided on the coil pipe 1 in order to improve the adhesion to the coil pipe 11.
Press-fitting may be performed using a tube having an inner diameter smaller than the outer diameter of 1, or a heat-shrinkable tube may be used.

The flexible tube 13 on the inner surface side is pulled in the axial direction at the time of assembling, and is positioned in the coil pipe 11 in a state where the outer diameter is reduced. Then, the pulling force is released and the flexible tube 13 adheres to the inner surface of the coil pipe 11. Alternatively, a thermal expansion tube may be used. Further, a tube having a size that can be loosely inserted into the coil pipe 11 may be used as it is.

The front and rear ends of the inner and outer flexible tubes 13 and 12 are formed so as to extend from the end of the coil pipe 11 and are joined in a watertight manner. Coil pipe 11 sandwiched between
However, it is completely shielded from the outside.

The distal end portions of the flexible tubes 13 and 12 are directly joined to each other, and that portion is connected to the distal end main body 2.
03 is fitted to a cylindrical portion 203a formed at the rear end and fixedly connected by binding.

In the rear end portion 1a of the sheath 1, a metal tapered cylinder 1 fixed to the rear end of the coil pipe 11 is provided.
The flexible tubes 13 and 12 are joined to both the front and back surfaces of No. 5, and have a tapered shape that spreads outward as a whole. This tapered shape is formed in the same shape as a so-called injection taper used for a connection portion between a general syringe and a needle.

FIG. 2 shows a state in which the operating section 100 is connected to the proximal end of the sheath 1. Main body 10 of operation unit 100
A tapered tapered projection 102 is straightly formed at the front end portion of the sheath 1, and a rear end tapered portion 1 a of the sheath 1 is bitten and connected to the tapered projection 102, and the state is maintained by frictional force.

The proximal end (rear end) of the operation wire 204
The reinforcing pipe 20 having the fixing end 204b formed therein
4a is attached. Then, the operation unit main body 101
A wire connecting member 109 for fixing the fixing end 204b of the operation wire 204 is slidably fitted in a longitudinal direction in a long groove 108 formed largely in an intermediate portion of the wire connecting member 109. The fixing end 204b of the operation wire 204 is inserted into the hole formed.

Reference numeral 113 denotes a terminal protruding laterally for connection to a high-frequency power supply (not shown). Screw part (holding screw) 1 protruding from the back side of the terminal 113
14 is screwed into the wire connecting member 109, and a holding screw 114 is attached to the fixing end 204 b of the operation wire 204.
End faces come into contact with the sides.

As a result, when the terminal 113 is pinched and the holding screw 114 is screwed tightly into the wire connecting member 109, the fixing end 204 b of the operation wire 204 is pressed and fixed to the wire connecting member 109.

When the terminal 113 is rotated in the opposite direction to loosen the cap screw 114, the pressed state is released and the operation wire 204 comes off the operation section 100. In addition,
When the terminal 113 is connected to a high-frequency power supply and the switch is turned on, a high-frequency current flows from the set screw 114 to the operation wire 20.
4 to the tissue collection cup 201 on the distal side,
A so-called hot biopsy can be performed.

The wire connecting member 109 includes the operation unit body 1
01 slider 110 that can be slid in the longitudinal direction
Are connected, and a thumb rests on a thumb rest 111 attached to an end of the operation unit main body 101, and a slider 110
By performing a sliding operation by sandwiching between the index finger and the middle finger, the operation wire 204 can be moved forward and backward in the axial direction.

After use, the terminal 113 is rotated to loosen the holding screw 114, and the operation wire 204 is disengaged from the operation section 100, so that the sheath 1 and the operation wire 204 can be separated from the operation section 100.

In the endoscope treatment instrument thus configured, the sheath 1 has flexibility, straightness retention, compression resistance, and the like due to the characteristics of the coil pipe 11, and has sniper resistance and durability. Is excellent.

Moreover, since the coil pipe 11 is shielded from the outside and is not contaminated, and is exposed to dirty liquid and the like on the surfaces of the inner and outer flexible tubes 13 and 12, it can be easily cleaned by cleaning after use. Can be.

FIG. 3 shows a treatment tool for an endoscope according to a second embodiment of the present invention, in which the present invention is applied to a high-frequency snare in which a snare loop wire 301 is disposed in a distal treatment section 300. is there.

The snare loop wire 301 is connected to the distal end of the operation wire 204 via the connection pipe 302. When the snare loop wire 301 projects from the distal end portion of the sheath 1 as shown in FIG. When the torsion 204 is operated, it is drawn into the sheath 1 and contracts.

Since the distal end treatment section 300 is not connected to the distal end portion of the sheath 1, both the inner and outer flexible tubes 1
A cylindrical metal ring 16 is arranged between the tip portions of the metal rings 3 and 12, and the flexible tubes 13 and 12 are water-tightly bonded to the inner and outer surfaces of the metal ring 16. The structure of the rear end side of the sheath 1 is the same as that of the first embodiment, and can be used by being connected to the operation unit 100 shown in FIG.

In the treatment instrument having such a configuration, the operation wire 204 can be removed from the sheath 1, so that the inner surface portion of the sheath 1 can be more easily and reliably cleaned after use.

FIG. 4 shows a treatment tool for an endoscope according to a third embodiment of the present invention. The present invention is applied to a grasping tool for an endoscope in which a basket type loop wire 401 is disposed in a distal treatment section 400. Is applied.

In this embodiment, since no high-frequency current is used, no terminal or the like is required for the operation unit 100, but the other configuration is the same as that of the second embodiment.
Thus, the present invention can be applied to various endoscope treatment tools.

FIG. 5 shows a treatment tool for an endoscope according to a fourth embodiment of the present invention. In the same hot biopsy biopsy forceps as in the first embodiment, a distal treatment from the distal end of the sheath 1 is performed. The part 200 can be removed.

At the distal end portions of the inner and outer flexible tubes 13 and 12 which are joined to each other in a water-tight manner, a metal distal end cap 17 having an internal thread formed on an inner surface thereof is fixed by adhesive binding. A male screw formed on the tip main body 203 side with respect to the screw is releasable.

With this configuration, even in the case of a hot biopsy biopsy forceps, the distal treatment section 200 can be removed from the sheath 1 and the operation wire 204 can be removed together therewith. Similarly, after use, the inner surface of the sheath 1 can be more easily and reliably cleaned.

[0037]

According to the present invention, since the sheath of the treatment instrument for an endoscope is formed by covering the inner and outer surfaces of the coil pipe with the flexible tubes in a watertight manner, the sheath is flexible and has a straight-line holding property. It has excellent resistance to sniping and durability because it has compression resistance, etc., and the coil pipe is shielded from the outside so that it is not contaminated. Therefore, it can be easily washed after use.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an endoscope treatment tool according to a first embodiment of the present invention, excluding an operation unit.

FIG. 2 is a side sectional view of an operation unit of the endoscope treatment tool according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of a distal end portion of an endoscope treatment tool according to a second embodiment of the present invention.

FIG. 4 is a side view of the entire configuration of a treatment tool for an endoscope according to a third embodiment of the present invention.

FIG. 5 is a side sectional view of a distal end portion of an endoscope treatment tool according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 sheath 11 coil pipe 13, 12 flexible tube 100 operation unit 200 distal treatment unit 204 operation wire

Claims (3)

[Claims] 1. An endoscope treatment tool having a flexible sheath inserted into and removed from a treatment tool insertion channel of an endoscope, wherein the sheath is formed by spirally winding a thin metal wire with a substantially constant diameter. A treatment instrument for an endoscope, wherein a flexible tube is covered on both inner and outer surfaces of a formed coil pipe in a watertight state. 2. The treatment tool for an endoscope according to claim 1, wherein an operation wire is inserted into the sheath so as to be able to advance and retreat in the axial direction, and the operation wire is insertable into and removable from the sheath. 3. The treatment tool for an endoscope according to claim 1, wherein a treatment member is detachably attached to a distal end of the sheath.