JPH08332190A - Disposition means for endoscope - Google Patents

Abstract

PURPOSE: To provide a disposition means for an endoscope which has good operability and insertability and is capable of easily aiming the lesion from the front with a simple structure. CONSTITUTION: This disposition means 10 for the endoscope has a flexible shaft 13 which is freely forward and backward movably inserted into the disposition means insertion channel of the endoscope. A universally curving part 14 which is universally curvable in arbitrary directions with small expandability and contractability in an axial direction is formed at the front end of this flexible shaft 13 and the max. curving angle of the universally curving part 14 is set at <=70 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment instrument for an endoscope having a flexible shaft which is insertably and retractably inserted into a treatment instrument insertion channel of an endoscope.

[0002]

2. Description of the Related Art Generally, a treatment tool for an endoscope has a flexible shaft formed of a tightly wound stainless steel coil or the like, and a treatment piece is attached to the distal end thereof.

[0003]

When the affected part is sniped with such a conventional treatment instrument, as shown in FIG. 9, the distal end portion of the flexible shaft 91 of the treatment instrument is inserted into the treatment instrument insertion channel of the endoscope 92. It is projected straight from 93 to the affected area.
Therefore, an accurate treatment cannot be performed on the affected area A or the like that cannot be located in front of the endoscope 92.

Therefore, if the flexible shaft 91 is further pushed out from the treatment instrument insertion channel 93 while the distal end of the endoscope treatment tool is pressed to the vicinity of the affected part, the flexible shaft 91 bends and the direction of the tip changes. Since stainless steel coils and the like have a strong elasticity, the bent portion bounces, the tip of the treatment instrument comes off the affected portion, and eventually returns to the original straight state.

Therefore, there is a flexible shaft 91 in which the tip portion can be flexibly bent by remote control (Japanese Utility Model Publication No. 52-22146, Japanese Utility Model Publication No. 1-119).
No. 621).

However, in such an endoscopic treatment instrument,
Since it is necessary to perform a treatment operation and a bending operation with the operation portion of the treatment tool, the operability is very poor, and it is not easy to bring the tip into contact with the affected area from the front side. Since the operation wire for operation and the operation wire for bending operation are inserted side by side, the flexible shaft becomes hard and the insertability into the treatment instrument insertion channel deteriorates.

It is therefore an object of the present invention to provide an endoscopic treatment tool which has good operability and insertability, and has a simple structure to easily aim at a diseased part from the front.

[0008]

In order to achieve the above-mentioned object, a treatment instrument for an endoscope of the present invention has a flexible shaft that is inserted into a treatment instrument insertion channel of an endoscope so as to be able to advance and retract. In the treatment tool for an endoscope, a bendable portion that has little elasticity in the axial direction and is bendable in an arbitrary direction is formed at the tip portion of the flexible shaft, and the maximum bend angle of the bendable portion is 70 ° or less. It is characterized by being set to.

The length of the bendable portion is preferably set to 50 mm or less.

[0010]

Embodiments will be described with reference to the drawings. Figure 1
Although the distal end portion of the endoscopic treatment tool 10 according to the first embodiment of the present invention is shown, the endoscopic treatment tool 10 is inserted into the endoscope 1 as shown in FIG. It is used by being inserted into the channel 2 so that it can move back and forth.

The treatment instrument 10 for an endoscope is constructed by connecting a distal treatment piece 11 and an operating portion 12 on the proximal side by a flexible shaft 13 to perform operations such as opening and closing of the distal treatment piece 11. ,
It can be performed by remote control from the operation unit 12 side.

The flexible shaft 13 is formed of a so-called close-wound coil in which a thin stainless steel wire is closely wound to the same diameter over substantially the entire length, and as shown in FIG. 1, it can be bent freely in any direction. The portion 14 is the flexible shaft 13.
Is formed only at the tip of the. The length of the flexible shaft 13 is, for example, 1 to 2 m.

In this embodiment, the endoscopic treatment tool 1 is used.
Reference numeral 0 is a biopsy forceps, and a pair of forceps cups 11b opened and closed by a link mechanism 11a is provided on the distal treatment piece 11 portion.
Is provided.

The link mechanism 1 is provided in the flexible shaft 13.
A device piece operation wire 16 that is operated to move back and forth from the operation portion 12 side to operate 1a is inserted over the entire length so as to be able to move back and forth.

Like the so-called four-direction bending mechanism of the endoscope, the bendable portion 14 is constituted by connecting stainless steel node rings 14a formed in a short tubular shape to each other in a freely rotatable manner. No operating wire is provided for remotely controlling the bend.

At both front and rear ends of each node ring 14a, a pair of tongue pieces project from each of the front end side and the rear end side with their directions turned 90 °, and the tongue pieces of adjacent node rings 14a are connected to each other. Are rotatably connected by rivets 14b. And
The treatment piece operating wire 16 is inserted inside the node ring 14a group.

As shown in FIG. 1, the front and rear end surfaces of each node ring 14a are centered on the tongue piece connected by the rivet 14b, and are separated from the end surface of the adjacent node ring 14a as going outward from there. It is formed on the slope.

Therefore, each node ring 14a can freely rotate about the rivet 14b to the extent that the slope hits the adjacent node ring 14a.
As a whole, it can be bent in any direction. However, it does not expand or contract at all in the axial direction.

When using the endoscopic treatment tool 10 of the embodiment thus constructed, first, as shown in FIG. 3, the distal end portion of the treatment tool 10 is inserted into the treatment tool insertion channel of the endoscope 1. The distal treatment piece 11 is pushed out onto the portion having the affected area A by protruding from 2.

After that, when the flexible shaft 13 is further pushed out, as shown in FIG. 4, the bendable portion 14 is in a natural state with the distal treatment piece 11 pressed near the affected area A as a fulcrum. With this, the distal treatment strip 11 can be smoothly bent, the orientation of the distal treatment strip 11 can be changed, and the distal treatment strip 11 can be brought into contact with the affected area A from the front.

As a result, in the case of such a biopsy forceps, the biopsy tissue of the affected area A can be accurately collected, and even if the endoscopic treatment tool 10 is of a type other than the biopsy forceps, the affected area A can be obtained. Can be accurately treated.

However, the more the flexible portion 14 is bent, the more difficult it is for the distal treatment piece 11 to move in the direction V from the front toward the affected area A when the flexible shaft 13 is pushed out in the tube axis direction U. The pressing force of the distal treatment piece 11 against A becomes small.

According to experiments, when the bending angle of the bendable portion 14 exceeds 70 °, the pressing force of the distal treatment piece 11 against the affected area A becomes extremely small, and the affected area A cannot be smoothly treated. Therefore, the maximum bending angle of the bendable portion 14 is preferably set to 70 ° or less.

5 to 8 show an example of use of the treatment tool for an endoscope to which the present invention is applied. The bendable portion 14 is schematically shown in each drawing. FIG. 5 shows a use state in which a treatment tool 10 projected from the endoscope 1 is used in the bronchus to aim at the affected area A. Since the diameter of the bronchus is about 12 mm to 16 mm, the bendable portion 14 The length is preferably about 10 mm or less.

FIG. 6 shows a state of use in which the affected part A is snipered with the treatment tool 10 projected from the endoscope 1 in the duodenum. Since the diameter of the duodenum is about 40 mm to 60 mm, the bendable part is shown. The length of 14 is preferably set to about 30 mm or less.

FIG. 7 shows a usage state in which a treatment tool 10 projected from the endoscope 1 is used to aim at the affected area A in the large intestine. Since the diameter of the large intestine is about 70 mm, the length of the bendable portion 14 is long. It is preferable to set the length to about 40 mm or less.

FIG. 8 shows a state of use in which the treatment tool 10 projected from the endoscope 1 is used to aim at the affected area A in the stomach. The length of the free portion 14 is preferably set to about 50 mm or less. Generally, since it is not necessary to consider use for an organ larger than the stomach, it is desirable that the length of the bendable portion 14 be 50 mm or less, and it is set according to the purpose of use.

The specific structure of the bendable portion 14 of the present invention is not limited to the above-described embodiments, and a flexible cylindrical elastic material such as silicon rubber is formed of a metal coil or metal. It may be formed by embedding a mesh tube or the like.

[0029]

According to the present invention, the distal end portion of the treatment tool is internally viewed by forming the flexible portion at the distal end portion of the flexible shaft, which has a small elasticity in the axial direction and is bendable in an arbitrary direction. When the flexible shaft is pushed further out by protruding from the treatment tool insertion channel of the mirror and pressing against the part with the affected part, the flexible part bends smoothly in a natural state with the tip part pressed against the affected part as a fulcrum, The direction of the tip portion changes, and it is possible to contact the affected area from the front.

Therefore, it is possible to easily aim at the affected area from the front with a simple structure having good operability, and since no bending operation wire or the like is required, the insertability into the treatment instrument insertion channel is also good.

Then, the maximum bending angle of the bendable portion is set to 70.
By setting the angle to be less than or equal to °, it is possible to surely press the distal end portion against the affected area by the force that advances and retracts the flexible shaft.

[Brief description of drawings]

FIG. 1 is a perspective view of a distal end portion of an endoscope treatment tool according to an embodiment.

FIG. 2 is an overall side view of a use state of the endoscopic treatment tool of the embodiment.

FIG. 3 is a side view of the distal end portion of the endoscopic treatment tool of the embodiment in a used state.

FIG. 4 is a side view of the distal end portion of the endoscopic treatment tool of the embodiment in a used state.

FIG. 5 is a schematic view of a usage state of the endoscopic treatment tool of the embodiment.

FIG. 6 is a schematic view of a usage state of the endoscopic treatment tool of the embodiment.

FIG. 7 is a schematic view of a usage state of the endoscopic treatment tool of the embodiment.

FIG. 8 is a schematic view of a usage state of the endoscopic treatment tool of the embodiment.

FIG. 9 is a side view of a distal end portion of a conventional endoscope treatment tool in a used state.

[Explanation of symbols]

 2 Treatment tool insertion channel 10 Treatment tool 11 Tip treatment piece 13 Flexible shaft 14 Flexible part

Claims (2)

[Claims] 1. A treatment instrument for an endoscope having a flexible shaft which is inserted into a treatment instrument insertion channel of an endoscope so as to be able to advance and retreat, and which has a small elasticity in the axial direction and is bendable in any direction. A treatment instrument for an endoscope, wherein a flexible portion is formed at a tip end portion of the flexible shaft, and a maximum bending angle of the flexible portion is set to 70 ° or less. 2. The endoscopic treatment tool according to claim 1, wherein the length of the bendable portion is set to 50 mm or less.