JP2007283015A - Clip apparatus for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clip apparatus for endoscope, wherein a joining member which is installed on the tip of an operating wire so as to be detached in engagement with a rear of the clip, can be easily and surely detached from the clip in placing the clip, and the clip can be smoothly placed in a body. <P>SOLUTION: The joining member 5 is formed by a pair of arms 5a which can open and close in a beak shape and is biased in a direction of opening. Tips of the arms open in the beak shape in the absence of external force, and are composed so as to be elastically transformed into a narrowed state in a sheath 1. In addition, hemispherical engagement projections 5b which engage with a rear part 3b of a clip 3 are formed on the inside of the vicinity of the tips of each arm 5a, so as to project. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an endoscope clip device that is used through a treatment instrument insertion channel of an endoscope in order to perform hemostasis or marking in a living body or the like.

Clipping treatment for performing hemostasis, marking, etc. in a luminal organ or the like is performed by passing the clip device through a treatment instrument insertion channel of an endoscope, and such an endoscope clip device is generally treated. An operation wire is arranged in the sheath that is inserted into and removed from the instrument insertion channel so as to be able to advance and retract in the axial direction, and a clip that can be opened and closed like a hook is arranged in a state of being constricted in the distal end of the sheath. A connecting member attached to the tip of the wire is detachably connected to the rear end portion of the clip, and when the clip is pushed out of the tip of the sheath by the operation wire, the clip is once opened outside the sheath and then kept closed. In this state, the coupling member and the clip can be disengaged (for example, Patent Documents 1 and 2).
JP-A-8-126648 JP2002-191609

  However, in the conventional endoscope clip apparatus as described above, since a so-called hook-shaped member is used as the connecting member, the connecting member and the clip can be firmly engaged, but the connecting member. It is not easy to separate the clip from the clip, and when the connecting member is removed from the clip, the clip bites into the living tissue. In some cases, the clip may come off the living tissue.

  Therefore, the present invention can easily and surely remove the connecting member attached to the tip of the operation wire so as to be engaged with and disengaged from the rear end portion of the clip from the clip, and the clip can be smoothly placed in the body. It is an object of the present invention to provide an endoscopic clip device that can be used.

  In order to achieve the above object, an endoscope clip device according to the present invention has an operation wire disposed in a sheath that is inserted into and removed from a treatment instrument insertion channel of an endoscope so as to be capable of moving forward and backward in the axial direction. The clip that can be opened and closed in a shape is disposed in a state of being constricted in the distal end of the sheath, the connecting member attached to the distal end of the operation wire is detachably connected to the rear end portion of the clip, An endoscope clip configured such that when it is pushed out from the distal end of the sheath by the operation wire, it is once opened outside the sheath and then kept closed, and in this state, the coupling member and the clip can be disengaged. In the device, the connecting member is formed by a pair of arms that can be opened and closed in a hook shape and biased in the opening direction, and the tip is opened in a hook shape when no external force is applied. Together configured to narrowed was state to the elastic deformation, the inner surface portion near the tip of each arm is a hemispherical engagement projection to be engaged with the rear end portion of the clip that is protruded.

  The rear end portion of the clip with which the engagement protrusion engages is formed in an annular shape by bending back the metal plate, and the opening protrusion is engaged with the engagement protrusion fitted from the outside. Alternatively, the connecting member may be formed of a plate material having a spring property, and the engaging protrusion may be protruded by pressing.

  According to the present invention, the connecting member attached to the distal end of the operation wire so as to be engaged with and disengaged from the rear end portion of the clip is formed by the pair of arms that can be opened and closed like a bowl and biased in the opening direction. When the external force is not applied, the tip opens in a bowl shape and is elastically deformed into a constricted state in the sheath. By projecting the hemispherical engagement protrusion that engages with the clip, it can be easily and reliably removed from the clip when the clip is placed, and the clip can be placed smoothly in the body.

  An operation wire is disposed in the sheath that is inserted into and removed from the treatment instrument insertion channel of the endoscope so as to be movable back and forth in the axial direction, and a clip that can be opened and closed in a hook shape is constricted in the distal end of the sheath. The connecting member attached to the tip of the operation wire is detachably connected to the rear end portion of the clip. When the clip is pushed out of the tip of the sheath by the operation wire, the clip is once opened outside the sheath and then closed. In an endoscope clip device configured to maintain the state and disengage the coupling member and the clip in that state, the coupling member can be opened and closed like a hook and attached in the opening direction. It is formed by a pair of energized arms, and is configured so that the tip opens in a hook shape when no external force is applied, and is elastically deformed into a constricted state in the sheath. A tip inner surface portion in the vicinity of, projecting form the hemispherical engagement projection for engaging the rear end portion of the clip.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the entire configuration of the endoscope clip device. An operation wire 2 advances and retreats in the axial direction in a flexible sheath 1 which is inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown). It is freely inserted through the entire length.

  Reference numeral 10 denotes an operation unit. By operating the slide operation member 12 having the proximal end of the operation wire 2 connected to the operation unit main body 11 to which the proximal end of the sheath 1 is connected, the operation wire is operated in the sheath 1. 2 can advance and retreat, and the clip 3 can be pushed out from the distal end of the sheath 1 to be opened and closed.

  FIG. 3 is a side sectional view of the vicinity of the distal end of the endoscope clip device. The sheath 1 of this embodiment is formed of a flexible tube such as a tetrafluoroethylene resin tube. However, you may form with the coil pipe etc. which closely wound the stainless steel wire by the fixed diameter.

  The clip 3 is formed in a shape that can be opened and closed in a bowl shape toward the front by bending back a plate material having a spring property such as a stainless steel plate on the rear end side and elastically deforming it. Yes.

  As shown by a two-dot chain line in FIG. 1, the clip 3 is a short cylindrical ring that is wide open on the front end side in a single state where no external force is applied, and is fitted to the clip 3 so as to be able to move forward and backward. When 4 is moved toward the front side of the clip 3 as indicated by a solid line, it is elastically deformed to the closed state, and when the fastening ring 4 is moved toward the rear side, it returns to the state opened in a bowl shape by its own elasticity. It has become.

  A pair of front-end claw portions 3 a protruding in the closing direction of the clip 3 are bent at the most distal portion of the clip 3 so as to face each other. The pair of tip claws 3a are formed with their folding positions slightly shifted in the front-rear direction so that they do not collide with each other when the clip 3 is fully closed.

  The rear end bending return portion of the clip 3 is a rear end connection hole portion 3b having a shape swelled in an annular shape so that a connection member 5 described later can be engaged. The opening surface of the rear end connecting hole 3 b is parallel to the opening / closing direction of the clip 3.

  Returning to FIG. 3, a metal or plastic cylindrical tip 7 is fixedly attached to the most distal portion of the sheath 1. The distal tip 7 is formed so that the inner diameter dimension thereof is substantially the same as that of the sheath 1, and is regarded as constituting a part of the sheath 1.

  The tip end portion of the tip tip 7 is a tip opening 7a having a slightly narrower diameter, and a plurality of slits 7b from the tip end surface of the tip tip 7 to the rear are arranged at intervals of, for example, 120 ° or 90 ° in the direction parallel to the axis. It is formed at an interval. Therefore, the tip opening 7a portion of the tip tip 7 can be elastically deformed to expand the diameter.

  A connecting member 5 detachably connected to the clip 3 is fixedly connected to the distal end of the operation wire 2 via a connecting pipe 6. The connecting member 5 is formed by a pair of arms 5a made of a plate material having a spring property that can be opened and closed like a bowl and urged in the opening direction. As a result, the tip opens like a bowl and elastically deforms into a constricted state in the sheath 1.

  A hemispherical engagement protrusion 5b that engages with the rear end connection hole 3b of the clip 3 is formed on the inner surface of the vicinity of the tip of each arm 5a by, for example, press working. By being narrowed, the engaging protrusion 5b engages with the clip 3 at the opening end portion of the rear end connecting hole 3b from the outside.

  When the connecting member 5 is out of the sheath 1, as shown in FIG. 1, the distal end of the connecting member 5 is opened by the elasticity of the arm 5a itself, so that the clip 3 is engaged with the rear end connecting hole 3b. The protrusion 5b is naturally disengaged.

  When the endoscope clip device configured as described above is used, as shown in FIG. 3, the connecting member 5 is inserted into the rear end connecting hole 3 b of the clip 3 constricted in the sheath 1. With the engagement protrusion 5b engaged, the endoscope is passed through a treatment instrument insertion channel of an endoscope (not shown).

  When the distal end of the sheath 1 is directed to the target affected part in the body, the clip 3 is moved forward in the sheath 1 as shown in FIG. 4 by strongly pushing the operation wire 2 from the proximal end side. The clip 3 jumps forward from the tip opening 7a of the tip tip 7, and the fastening ring 4 has a larger outer diameter than the tip opening 7a of the tip tip 7, so it hits the tip opening 7a and remains in the tip tip 7. It moves backward relative to the clip 3.

  As a result, as shown in FIG. 5, the clip 3 is maximally spread in front of the sheath 1. Then, when the fastening ring 4 is moved to the position of the rear end of the advancing / retreating range with respect to the clip 3, the fastening ring 4 is pushed forward by the clip 3, and the fastening ring 4 is moved to the tip as shown in FIG. 7 passes through while being elastically deformed so as to push and expand the tip opening 7a portion.

  As shown in FIG. 7, the clip 3 and the fastening ring 4 are pushed forward from the tip tip 7, but the rear end connecting hole 3 b of the clip 3 is formed at the outer edge of the tip opening 7 a of the tip tip 7. By abutting, it stops once at that position. At that time, the fastening ring 4 is located at the rear end of the advance / retreat range with respect to the clip 3, and the clip 3 is expanded to the maximum by its own elasticity. In this state, the clip 3 can be pressed against the target affected part.

  Therefore, as shown in FIG. 8, when the operation wire 2 is pulled toward the proximal end side, the rear end portion of the clip 3 is in contact with the distal end surface of the distal end tip 7 while the rear end portion of the clip 3 is in the sheath 1. Then, the fastening ring 4 moves to the front end of the advancing / retreating range with respect to the clip 3, the clip 3 is forcibly closed by the fastening ring 4, and the target affected area is tightly clamped, and the operation wire 2 is moved further. It becomes impossible to perform tow operation.

  Then, as shown in FIGS. 9 and 1, if the operation wire 2 is pushed into the distal end side to push the coupling member 5 forward from the distal end opening 7 a of the distal tip 7, the coupling member 5 is By naturally opening with its own elasticity, the connection between the engaging projection 5b and the rear end connecting hole 3b of the clip 3 is released, and the clip 3 is left in the body with the target affected part clipped. At that time, since the engaging protrusion 5b is formed in a hemispherical shape, the connection member 5 and the clip 3 are smoothly separated without being caught.

  In addition, this invention is not limited to the said Example, For example, as FIG. 10 shows, the short cylinder shape for hold | suppressing that the connection member 5 opens in the sheath 1 by its own elasticity. A connecting member fastening ring 50 may be arranged.

It is a perspective view of the front-end | tip part of the clip apparatus for endoscopes of the 1st Example of this invention. It is an external view of the whole structure of the clip apparatus for endoscopes of the 1st Example of this invention. It is side surface sectional drawing of the tip vicinity of the clip apparatus for endoscopes of 1st Example of this invention. It is a top sectional view showing operation at the time of use of the clip device for endoscopes of the 1st example of the present invention. It is a top sectional view showing operation at the time of use of the clip device for endoscopes of the 1st example of the present invention. It is a top sectional view showing operation at the time of use of the clip device for endoscopes of the 1st example of the present invention. It is a top sectional view showing operation at the time of use of the clip device for endoscopes of the 1st example of the present invention. It is a top sectional view showing operation at the time of use of the clip device for endoscopes of the 1st example of the present invention. It is side surface sectional drawing which shows the operation | movement at the time of use of the clip apparatus for endoscopes of 1st Example of this invention. It is side surface sectional drawing of the tip vicinity of the clip apparatus for endoscopes of the 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheath 2 Operation wire 3 Clip 3b Rear end connection hole (rear end part)
4 Fastening Ring 5 Connecting Member 5a Arm 5b Engaging Protrusion 7 Tip Tip

Claims (3)

An operation wire is disposed in the sheath inserted into and removed from the treatment instrument insertion channel of the endoscope so as to be movable back and forth in the axial direction, and a clip that can be opened and closed in a hook shape is constricted in the distal end of the sheath. When the clip is pushed out from the distal end of the sheath by the manipulation wire, the coupling member attached to the distal end of the manipulation wire is detachably coupled to the rear end portion of the clip. In the endoscope clip device configured to maintain the closed state after being opened at once, and to disengage the coupling member and the clip in that state,
The connecting member is formed by a pair of arms that are openable and closable in a hook shape and biased in the opening direction. The tip opens in a hook shape when no external force is applied, and is narrowed in the sheath. An internal projection that is formed so as to be elastically deformed in a bent state, and a hemispherical engagement protrusion that engages with the rear end portion of the clip is formed on the inner surface portion near the front end of each arm. Mirror clip device.   A rear end portion of the clip with which the engagement protrusion engages is formed in an annular shape by bending back a metal plate, and engages in a state in which the engagement protrusion is fitted into the opening end portion from the outside. The endoscope clip device according to claim 1.   The endoscope clip device according to claim 1 or 2, wherein the connecting member is formed of a plate material having a spring property, and the engaging protrusion is formed by pressing.

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