JP2003339720A - Clip device for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the clip device for an endoscope not having fear such that a clip is separated from a sheath by the carelessness or the like of an operator and easy to use. <P>SOLUTION: In the clip device for the endoscope constituted so that the rear half part of the clip 2 is drawn in a clip closing ring 6 by drawing the operation wire 3 passed through the sheath 1 from the base end thereof to open and close the clip 2, the frictional engaging part A frictionally locked with the inner wall surface of the jacket pipe 10 in which the sheath 1 is inserted and arranged is provided to the clip 2 or the clip closing ring 6. <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 FIG. 10 shows an example of a conventional general clip device for an endoscope, in which a plurality of arms 2a connected to each other at a base end thereof are provided so as to be openable and closable. Adjacent to the rear side, a clip closing ring 6 that holds the closed state after opening and closing the clip 2 by engaging the latter half of the clip 2 is arranged.

The clip closing ring 6 is detachably attached to the front end portion of the sheath 1 inserted through an outer tube 10 which is movable in the axial direction from the front side and extends rearward from the rear end of the clip 2. The clip connecting wire 5 to be output is the clip connecting hook 4 attached to the tip of the operation wire 3.
Is engaged with and disengaged from.

With such a structure, by pulling the operation wire 3 passed through the sheath 1 from the proximal end side,
The latter half of the clip 1 is drawn into the clip closing ring 6 to open and close the clip 2.

[0005]

However, such an endoscope clip device inadvertently loosens the tension of the operation wire 3 during the insertion operation of the endoscope into the treatment instrument insertion channel. When operated, as shown in FIG. 11, the clip closing ring 6 may be separated from the distal end portion of the sheath 1 and the clip 2 may be separated.

Therefore, an object of the present invention is to provide an easy-to-use clip device for an endoscope, in which the clip is not likely to come off the sheath due to carelessness of an operator.

[0007]

In order to achieve the above-mentioned object, the clip device for an endoscope of the present invention has a rear end of a clip provided with a plurality of arms connected to each other at a base end thereof. A clip closing ring is provided adjacent to the side to hold the clip in a closed state by opening and closing the clip by engaging the latter half of the clip, and the clip closing ring is inserted into the outer tube that can advance and retract in the axial direction. The distal end of the sheath is detachably attached from the front, and by pulling the operation wire passed through the sheath from the proximal side, the latter half of the clip is pulled into the clip closing ring and the clip is removed. In an endoscope clip device configured to open and close, a clip or a clip closing ring is provided with a friction engagement portion that frictionally engages with an inner wall surface of an outer tube.

The friction engagement portion may be a pressure contact portion formed on the arm portion of the clip or on the outer surface portion of the clip closing ring so as to be in pressure contact with the inner peripheral surface of the outer tube, or the friction engagement portion. The joint portion may be a plurality of pointed protrusions formed continuously or independently on the arm portion of the clip, or a spring-like protrusion portion formed by protruding outward on the arm portion of the clip.

[0009]

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 through 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 able to advance and retract independently in the axial direction.

In FIG. 2, a portion of the clip 2 near the base end is housed in the tip of the outer tube 10, and a pair of arms 2a are opened forward to some extent and the tips of the arms 2a are inward. The tip claw-shaped portion 2b formed so as to project toward is visible.

The operation portion 20 connected to the base end of the flexible sheath 1 has a finger hook 23a attached to the other end side of the operation portion main body 23 to which the base 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. 3 is an enlarged view of the tip portion of the endoscope clip device. The clip 2 is formed of, for example, a plate-shaped member such as a stainless steel plate material for spring, and a pair of arms 2a that are substantially parallel to each other in the outer tube 10 have a base end formed in an annular shape of about 360 °. End connection part 2
The front end claw-like portion 2b is bent inward and protrudes from the front end portion of each arm portion 2a.

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.

In a natural state where no external force is applied, the pair of arms 2a are formed to have a shape that spreads outward to some extent more than a state where they are inscribed in the outer sheath tube 10 and are constricted in parallel to form an outer sheath. When placed in the tube 10, as shown in FIG. 1 showing the I-I cross section, the outer edge ridge portions (friction engagement portions A) of the respective arm portions 2a are elastically attached to the inner wall surface of the outer tube 10. And is frictionally engaged with the inner peripheral surface of the outer tube 10.

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 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, which is fixed to the distal end of the flexible sheath 1. The cylindrical ring receiving member 8 is fitted in a portion near the tip end thereof so as to be detachable from the front.

The thus configured endoscope clip device is inserted into a treatment instrument insertion channel of an endoscope (not shown) in the state shown in FIG. The operation of loosening the tension of 3 may be performed.

However, the pair of arms 2a of the clip 2 is
The outer tube 10 is formed at the outer edge line (friction engagement portion A) on the outer surface side.
Since it is frictionally engaged with the inner wall surface, the clip closing ring 6 is not separated from the ring receiving member 8 and the clip 2 is not separated from the sheath 1.

By pulling the operating wire 3 from the operating portion 20 side, as shown in FIG. 4, the proximal end connecting portion 2c of the clip 2 is drawn into the clip closing ring 6 and is changed from a circular shape to an elliptical shape. Transformed into a pair of arms 2a
Changes to an open state 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 part of the clip left and right, the clip connecting wire 5 is disengaged from the clip connecting hook 4 and the clip 2 can be left in the body.

The present invention is not limited to the above embodiment, and as shown in, for example, FIGS. 6 and 7, a plurality of pointed projections are continuously formed on the outer edge ridge of the arm 2a of the clip 2. Of the frictional engagement portion A
If so, the engaging force with the outer tube 10 becomes stronger.

Further, as shown in FIG. 8, the clip 2
The frictional engagement portion A may be formed by forming a spring-like projection that bulges outward from the outer surface of the arm portion 2a, for example, in an arc shape, and presses that portion against the inner wall surface of the outer tube 10.

Further, as shown in FIG. 9, the outer diameter of a part (also a part in the circumferential direction) of the clip closing ring 6 is formed to be large and press-contacted to the inner wall surface of the outer tube 10, and the portion is inserted into the outer tube. A frictional engagement portion A that frictionally engages with the inner wall surface of 10 may be used.

[0027]

According to the present invention, the clip or the clip closing ring is provided with the friction engagement portion that frictionally engages with the inner wall surface of the outer tube, so that it is inserted into the treatment instrument insertion channel of the endoscope. At this time, even if the operation wire is inadvertently loosened, the clip or the clip closing ring is frictionally engaged with the inner wall surface of the outer tube, so the clip closing ring does not come loose from the distal end portion of the sheath. The clip will not come off the sheath.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the line I-I in FIG. 3 of the endoscope clip device according to the first embodiment of the present invention.

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

FIG. 3 is a side sectional view of the distal end portion of the endoscope clip device according to the first embodiment of the present invention.

FIG. 4 is a side sectional view showing an open state in the opening / closing operation of the clip of the endoscope clip device of the first embodiment of the present invention.

FIG. 5 is a side sectional view showing a closed state of a clip of the endoscope clip device according to the first embodiment of the present invention.

FIG. 6 is a side view showing in cross section a part of the distal end portion of the endoscope clip device of the second embodiment of the present invention.

FIG. 7 is a side view showing in cross section a part of the distal end portion of the endoscope clip device of the third embodiment of the present invention.

FIG. 8 is a side sectional view of a distal end portion of a clip device for an endoscope according to a fourth embodiment of the present invention.

FIG. 9 is a side sectional view of a distal end portion of the endoscope clip device according to the fifth embodiment of the present invention.

FIG. 10 is a side sectional view of a distal end portion of a conventional endoscope clip device.

FIG. 11 is a side cross-sectional view of a conventional endoscope clip device in a state where an operation wire at a distal end portion of the clip device is loosened.

[Explanation of symbols]

1 Flexible sheath 2 clips 2a Arm 3 operation wire 4 clip connection hook 5 clip connecting wire 6 clip closing ring 8 Ring receiving member A friction engagement part

Claims (4)

[Claims] 1. A plurality of arms connected to each other at their base ends are adjacent to the rear side of a clip provided to be openable and closable, and are engaged with the latter half of the clip to open and close the clip. A clip closing ring for holding in a closed state is arranged, and the clip closing ring is arranged so as to be engageable and disengageable from the front with respect to the distal end portion of the sheath which is inserted through the outer tube that is movable in the axial direction. In the clip device for an endoscope configured so that the latter half of the clip is drawn into the clip closing ring and the clip is opened and closed by pulling the operation wire passed through from the proximal end side. A clip device for an endoscope, wherein a friction engagement portion that frictionally engages an inner wall surface of the outer tube is provided on the clip or the clip closing ring. 2. The frictional engagement portion is a pressure contact portion formed on an arm portion of the clip or an outer surface portion of the clip closing ring so as to be pressure contacted with an inner peripheral surface of the outer tube. Clip device for endoscope. 3. The clip device for an endoscope according to claim 1, wherein the frictional engagement portion is a pointed projection formed continuously or independently on the arm portion of the clip. 4. The clip device for an endoscope according to claim 1, wherein the frictional engagement portion is a spring-like projection formed on the arm portion of the clip so as to bulge outward and project therefrom.