JP2003339719A - Clip device for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clip device for an endoscope capable of certainly and easily clipping in vivo tissue even from a tangential direction in such a case that it is difficult to shoot the in vivo tissue from the front. <P>SOLUTION: In the clip device for the endoscope constituted so that a clip 2 wherein a plurality of freely openable and closable arm parts 2a for holding the in vivo tissue are mutually connected at a base end part is held to a closed state by a clip closing member 6 and can be separated from a sheath 1, a side edge pawl tooth part 2d protruded toward the closing direction of the arm parts 2a is formed to the side edge parts of the arm parts 2a of the clip 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clip device for an endoscope which is used by passing through a treatment tool insertion channel of an endoscope and used for hemostasis, ligation or marking in the body.

[0002]

2. Description of the Related Art Generally, a clip device for an endoscope has an openable and closable clip in which a plurality of arms for sandwiching a body tissue are connected to each other at a proximal end thereof, and a closed state after opening and closing each clip. A clip closing ring for holding is arranged near the distal end of the sheath inserted through the treatment instrument insertion channel of the endoscope, and the clip held in the closed state by the clip closing ring can be detached from the sheath. Is configured.

[0003]

FIG. 9 shows a state in which the affected part 100 is being clipped by such a conventional endoscope clip device. 51 is an endoscope 5
0 is the outlet opening of the treatment instrument insertion channel.

However, since the conventional clip 2 has the claw teeth (the tip claw teeth 2b) formed at the tip of each of the plurality of arms 2a, as shown in FIG. If the affected area 100 can be snipered only from the direction close to the tangent line rather than from the front, the clip 2 can be used to
It was not uncommon to have to give up clipping because it was difficult to fix it in a stable state at 00.

Therefore, an object of the present invention is to provide a clip device for an endoscope, which can reliably and easily perform clipping even from the tangential direction when it is not possible to aim at a body tissue from the front. .

[0006]

In order to achieve the above object, according to the clip device for an endoscope of the present invention, a plurality of openable and closable arms for sandwiching a body tissue are connected to each other at a proximal end. Clip and a clip closing member for holding each arm in the closed state after opening and closing are arranged near the distal end of the sheath inserted through the treatment instrument insertion channel of the endoscope and closed by the clip closing member. In a clip device for an endoscope configured so that a clip held in a closed state can be detached from a sheath, a side edge of a clip arm has a side edge protruding toward a closing direction of the arm section. The claw teeth are formed.

The side edge claw tooth portion may be formed by arranging a plurality of pointed irregularities in a sawtooth shape.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows the entire configuration of the clip device for an endoscope. The clip 2 is attached to the tip of a coil pipe-shaped flexible sheath 1 in which, for example, a stainless steel wire is closely wound with a constant diameter.

An operating wire 3 whose tip is connected to a clip 2 is inserted in the flexible sheath 1 so as to be movable back and forth in the axial direction, and the outer surface of the flexible sheath 1 is made of, for example, tetrafluoroethylene resin. A flexible outer tube 10 made of a tube, a superelastic alloy tube, or the like is loosely fitted so as to be movable back and forth in the axial direction.

In FIG. 2, the clip 2 has a portion near the base end housed in the distal end of the outer tube 10, and a pair of arms 2a in a state of being opened forward to some extent and inward at each distal end thereof. The tip claw tooth portion 2b formed so as to project toward is visible.

The operating portion 20 connected to the proximal end of the flexible sheath 1 has a finger hook 23a attached to the other end side of the operating portion main body 23 to which the proximal end of the flexible sheath 1 is connected, and is operated. The slider 22 to which the proximal end of the wire 3 is connected is attached to the operation portion main body 23 so as to be slidable in the axial direction, and the operation wire 3 can be pulled in the axial direction.

FIG. 1 is an enlarged view of the tip portion of the endoscope clip device. In this figure, a natural state (that is, a state in which a pair of arm portions 2a are parallel to each other) when an external force is not applied is shown. The tip portion of the outer tube 10 is put on the clip 2 which is marked with).

The clip 2 is formed of a plate-like member such as a stainless steel plate material for springs, and the base ends of a pair of arms 2a that are parallel to each other in a natural state are formed into an annular shape of approximately 360 °. End claw teeth 2b are formed by bending inward from the tip of each arm 2a.

Further, a side edge claw tooth portion 2d is formed on the side edge portion of each arm portion 2a, in which a plurality of pointed concavities and convexities are arranged so as to project in a sawtooth shape in the closing direction of the arm portion 2a. The state is clearly shown in FIG. 4 described later.

The clip 2 is formed by bending a single plate-shaped member, and the boundary 2t between the base end connecting portion 2c and the pair of arms 2a is formed by the plate-shaped member from both outsides. It is bent into a constricted shape protruding inward, and the tops of the protruding portions are in contact with each other.

A clip connecting hook which can be engaged with and disengaged from a clip connecting wire 5 extending rearward from the clip 2 is attached to the tip of the operation wire 3 which is arranged so as to be movable back and forth at the axial position of the flexible sheath 1. 4 is attached.

The operation wire 3 is connected and fixed to the rear half of the clip connecting hook 4 by soldering or the like, and the annular clip connecting wire 5 is engaged in the recess 4a formed in the side surface of the front half. It can be removed. The clip connecting wire 5 is formed in an annular shape by connecting both end portions of one wire.

Reference numeral 6 denotes a clip closing ring (clip closing member) for deforming the base end connecting portion 2c of the clip 2 to open the arm portion 2a and then closing the arm portion 2a to hold the state. The cylindrical ring receiving member 8 fixed to the tip of the is fitted in a portion near the tip so as to be detachable from the front.

In the thus constructed endoscope clip device, the proximal end connecting portion 2c of the clip 2 is pulled into the clip closing ring 6 by pulling the operating wire 3 from the operating portion 20 side. By deforming from a circular shape to an elliptical shape, as shown in FIGS. 3 and 4, the pair of arm portions 2 a changes to a state in which they are opened toward the front of the flexible sheath 1.

In that state, when the body tissue to be clipped is positioned between the pair of arm portions 2a and the operating wire 3 is further pulled toward the operating portion 20, the clip is closed as shown in FIG. Clip 6 at the tip of ring 6
The pair of arms 2a are pushed from the back side, whereby the pair of arms 2a are closed in parallel, and the body tissue in front of the flexible sheath 1 can be clipped.

Then, by pulling back the flexible sheath 1 toward the hand side while pushing out the operation wire 3 slightly to the front side, the engagement between the clip connecting wire 5 and the clip connecting hook 4 is loosened, so that the flexible sheath 1 By appropriately moving the tip end portion of the clip left and right, the clip connecting wire 5 is disengaged from the clip connecting hook 4 and the clip 2 is left inside the body as shown in FIG.

FIG. 7 shows a usage state in which the clip 2 protruding from the outlet opening 51 of the treatment instrument insertion channel of the endoscope 50 can sniper the affected area 100 only from a direction close to the tangent line, not from the front side. There is.

In such a state, the tip claw tooth portion 2b is almost useless for clipping on the affected part 100, but the side edge claw tooth portion 2d arranged on the side edge portion of each arm portion 2a is not effective. Clipping is performed by cutting across the affected area 100.

The cross section is shown in FIG.
When the height of 00 is not larger than the width of the arm 2a, the side of the side edge claw teeth 2d formed on the left and right edges of each arm 2a, which is located on the base side of the affected part 100. The marginal tooth portion 2d bites the affected area 100, and the clip 2 moves to the affected area 10.
Clipped tightly to zero.

The present invention is not limited to the above-mentioned embodiment, and for example, the side edge claw tooth portion 2d does not necessarily have a sawtooth shape, and various embodiments can be adopted.

[0026]

According to the present invention, the side edge claw tooth portion projecting toward the closing direction of the arm portion is formed on the side edge portion of the arm portion of the clip, thereby sniping the internal tissue from the front. When it is impossible to perform clipping, it is possible to reliably and easily perform clipping even from the tangential direction.

[Brief description of drawings]

FIG. 1 is a side sectional view of a tip portion of an endoscope clip device according to an embodiment of the present invention.

FIG. 2 is an external view showing the overall configuration of the endoscope clip device according to the embodiment of the invention.

FIG. 3 is a side sectional view showing an open state in the opening / closing operation of the clip of the clip device for an endoscope according to the embodiment of the present invention.

FIG. 4 is a perspective view showing an open state in the opening / closing operation of the clip of the endoscope clip device according to the embodiment of the present invention.

FIG. 5 is a side sectional view showing a closed state in the opening / closing operation of the clip of the endoscope clip device of the embodiment of the present invention.

FIG. 6 is a side sectional view showing an indwelling state of a clip of the endoscope clip device according to the embodiment of the present invention.

FIG. 7 is a perspective view showing a usage state of a clip of the endoscope clip device according to the embodiment of the present invention.

FIG. 8 is a front sectional view showing a clipping state by the endoscope clip device according to the embodiment of the present invention.

FIG. 9 is a perspective view showing a usage state of a clip of a conventional endoscope clip device.

[Explanation of symbols]

1 Flexible sheath 2 clips 3 operation wire 2a Arm 2b Tip claw teeth 2d Side edge claw tooth 6 Clip closing ring (clip closing member) 20 Operation part

Claims (2)

[Claims] 1. A clip in which a plurality of openable and closable arm portions for sandwiching a body tissue are connected to each other at a base end portion, and a clip closing member for holding each of the arm portions in a closed state after being opened and closed. Is arranged near the distal end of the sheath that is inserted into the treatment instrument insertion channel of the endoscope, and is configured to allow the clip held in the closed state by the clip closing member to be detached from the sheath. In the clip device for an endoscope, a side edge claw tooth portion projecting toward the closing direction of the arm portion is formed at a side edge portion of the arm portion of the clip, the clip device for an endoscope. . 2. The clip device for an endoscope according to claim 1, wherein the side edge claw tooth portion is formed by arranging a plurality of pointed irregularities in a sawtooth shape.