JP5145523B2 - Endoscope clip - Google Patents

Description

  The present invention relates to an endoscope clip that is indwelled in a body in order to perform hemostasis from a luminal organ mucosa.

In general, the clip for the endoscope is bent back at the rear end portion, and when no external force is applied, a clip member formed of a material having a spring property so as to be expanded toward the front, It is configured by an annular clip fastening ring that is fitted on the clip member and moved from the rear side to the front side of the clip member to elastically deform the clip member to forcibly close it (for example, Patent Document 1).
JP 2007-68956 A

  If the clip member is fully closed by the clip tightening ring, the clip tightening ring cannot be pushed further in the direction of the tip of the clip member. It is hard to be detected. For this reason, the operator cannot be sure whether the clipping has been properly performed, and may cause an unreasonable operation to close the clip member, thereby damaging the clip or the clip device.

  Further, when the clip member is fully closed by the clip tightening ring, the clip tightening ring is stopped at that position by the frictional resistance with the clip member. If a strong force in the opening direction is applied to the clip member from the body tissue or the like after the indwelling state, the clip clamping ring is retracted to loosen the clamping force on the clip member, and the clip member is detached from the body tissue. May end up.

  The present invention has been made to solve such a problem, and in use, the operator senses that the clip member is fully closed by the clip tightening ring with the sense of the hand. An object of the present invention is to provide an endoscopic clip in which the tightening force of the clip tightening ring does not loosen after placement in the body.

The clip for endoscope according to the present invention is a clip member formed of a material having a spring property so that it is bent back at the rear end portion and has a shape expanded toward the front when no external force is applied. And an annular clip fastening ring that is fitted to the clip member and moved from the rear side to the front side of the clip member to elastically deform the clip member to forcibly close the clip member. In the mirror clip, the clip tightening ring is formed by winding a coil wire having a spring property into a pipe shape, and the clip member is fully closed by the clip tightening ring. sometimes coil wire of at least the most advanced portion of the clip tightening ring recess coil engagement engages is formed in the clip member, at a position adjacent to the rear side of the recess coil engagement, Clamping ring engaging portion to elastically deform the clip tightening ring which engages in a state of overlaying the this state in which the diameter is widened is formed.

Incidentally, the clip member, the clip member in a state where the clip clamping ring is fitted therein is straight parallel to the longitudinal direction deviation of the rear portion of the clip member to a predetermined fully open It is formed in a shape that spreads outward by drawing an arc from the rear side parallel part and the front end part of the rear side parallel part, so that the clip clamping ring is fitted there, and moves from the rear to the front The clip member is elastically deformed into a closed state when pressed by the pressure, and when the pushing force from the rear side against the clip clamping ring is released, the clip member is expanded by the elasticity of the clip member and acts to return the clip clamping ring to the rear side. The intermediate arc-shaped portion and the front-side arm that extends forward from the distal end portion of the intermediate arc-shaped portion and the clip fastening ring is fitted to the intermediate arc-shaped portion so that the clip member is in a predetermined fully closed state. And arm portion may be formed.

  The clip member may be formed in a shape bent at a boundary portion between the rear parallel portion and the intermediate arc-shaped portion so as to expand toward the intermediate arc-shaped portion with an angle change. The attached ring locking portion may be formed near the rear end of the front arm portion.

  According to the clip for an endoscope of the present invention, the clip engagement member is formed in the clip member so that the coil wire at least the most distal end portion of the clip fastening ring formed by winding the coil wire in a pipe shape is engaged. Therefore, during use, a click sensation occurs when the coil wire of the clip tightening ring enters the coil engagement recess, so that the clip member is fully closed by the clip tightening ring. The operator can detect it with the sense of the hand and eliminate the erroneous operation, and since the static force of the clip tightening ring against the clip member increases, the tightening force of the clip tightening ring is due to the action of external force after placement in the body. Does not loosen.

Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 shows an exploded view of an endoscope clip constituted by a clip member 1 and a clip tightening ring 2. In addition, illustration of a part of clip member 1 currently formed symmetrically in the shape of substantially eight characters is abbreviate | omitted. 2 and 3 are a side view and a plan view of a state in which the clip member 1 to which the clip tightening ring 2 is attached is fully expanded, and the clip tightening ring 2 is shown in cross section.

The clip member 1 is used to clamp the tip portion 1a in a state where the tip portion 1a is bitten into the living tissue in order to perform hemostasis and the like, and clip fastening for forcibly maintaining the clip member 1 in a closed state. The ring 2 is fitted in a state of covering the rear part (right side in each drawing) of the intermediate part of the clip member 1.
The clip member 1 is formed by bending a plate material having a spring property such as a stainless steel plate for a spring by press working or the like. FIG. 4 is a development view of the clip member 1 before being bent. The clip member 1 is formed in a vertically symmetric shape and a left-right symmetric shape, and its central portion is bent in a substantially U shape to form a rear end portion 1b of the clip member 1. Become.

  As shown in FIGS. 1 and 2, the rear end portion 1b of the clip member 1 is bent back in parallel so that the front-side front arm portion 1e is approximately eight toward the front when no external force is applied. It is formed in a shape that expands into a letter shape. The clip tightening ring 2 is formed of a metal coil in which a coil wire made of, for example, a stainless steel wire for a spring is closely wound in a pipe shape by a plurality of turns (for example, about 5 to 10 turns) in a circular cross-sectional shape with a constant diameter. Yes.

  The clip member 1 faces straight forward (leftward in the figure) straight from the rear end 1b so that the clip member 1 is in a predetermined fully open state when the clip fastening ring 2 is fitted thereto. A rear parallel portion 1c formed in a rearward portion of the clip member 1 in parallel in the front-rear direction, an intermediate arc-shaped portion 1d spreading outwardly from an end portion of the rear parallel portion 1c, A front arm portion 1e extending forward from the tip portion of the intermediate arc-shaped portion 1d is formed. A is a boundary portion between the intermediate arc-shaped portion 1d and the front arm portion 1e.

  As shown in FIG. 3, at the portion near the rear end of the rear parallel part 1c, the clip fastening ring 2 is further retracted by making the width of the clip member 1 slightly wider than the width of the rear parallel part 1c. A reverse stopper R is formed to restrict the movement. The width of the rear side parallel portion 1c is such that it is slightly inscribed in the clip tightening ring 2 in the state of being retracted to the retreat stopper R position as shown in FIG. 5 illustrating the cross section cut along the line AA in FIG. Is formed.

  Returning to FIG. 3, the intermediate arc-shaped portion 1d is formed to have the same width as the rear parallel portion 1c, and the front arm portion 1e has an intermediate arc-shape except for the vicinity of the boundary portion A with the intermediate arc-shaped portion 1d. It is formed wider than the portion 1d. That is, a portion near the rear end of the front arm portion 1e adjacent to the boundary portion A with the intermediate arc-shaped portion 1d is formed to have the same width as that of the intermediate arc-shaped portion 1d by a small range. The ring 2 is a tightening ring locking portion B that is tightly fitted and locked. The width of the fastening ring locking portion B is narrower than the front arm portion 1e closer to it, and wider than the intermediate arc-shaped portion 1d, and the clip fastening ring 2 covers the fastening ring locking portion B. When engaged, the elastic deformation occurs in a state where the diameter is slightly expanded.

  The front end portion of the tightening ring locking portion B is widened, and is a forward stopper portion S that completely prevents the tip end of the clip tightening ring 2 from coming into contact and moving further forward. When the clip member 1 is fully closed by the clip tightening ring 2 at a position adjacent to the forward stopper portion S of the front end portion of the tightening ring locking portion B, the clip tightening ring 2 Are formed in a shape that is recessed from both the left and right sides.

  Further, as shown in FIG. 2, in the clip member 1 of this embodiment, the boundary portion X between the rear parallel portion 1c and the intermediate arc-shaped portion 1d spreads toward the intermediate arc-shaped portion 1d side with an angle change. It is formed in a bent shape (bending angle θ). That is, the center position O of the arc of radius r forming the intermediate arc-shaped portion 1d is an angle with respect to a straight line orthogonal to the rear parallel portion 1c at the boundary portion X between the rear parallel portion 1c and the intermediate arc-shaped portion 1d. It is at a position bent backward by θ. The bending angle θ is preferably in the range of about 5 ° to 30 °, for example. Note that the radius of the intermediate arc-shaped portion 1d may not be constant, such as an elliptical arc instead of a perfect circular arc.

  The clip member 1 configured as described above is in a state of being passed through the clip tightening ring 2, and as shown in FIGS. 1 and 2, the clip tightening ring 2 is connected to the rear parallel portion 1 c. If it is located, the clip member 1 is in a predetermined fully open state. When an external force is applied to the clip tightening ring 2 to move the clip tightening ring 2 from the rear parallel portion 1c to the intermediate arcuate portion 1d closer to the front, the clip member 1 gradually closes. If the pressing force on the clip tightening ring 2 is released before the clip tightening ring 2 reaches the tightening ring locking portion B, the clip member 1 tries to return to the original expanded state by its own elasticity. The clip fastening ring 2 is returned to the rear side of the clip member 1 again by the force.

  The clip member 1 is formed in a shape bent at a boundary portion X between the rear side parallel portion 1c and the intermediate arc-shaped portion 1d so as to expand toward the intermediate arc-shaped portion 1d with an angle change. While the attaching ring 2 is in the region of the intermediate arc-shaped portion 1d, the elastic force of the intermediate arc-shaped portion 1d that attempts to return the clip tightening ring 2 backward acts on the clip tightening ring 2 reliably. As a result, the entire clip tightening ring 2 is always returned to the rear parallel portion 1c, and the clip member 1 is in a predetermined fully open state shown in FIGS.

  In the endoscopic clipping procedure, the operation of moving the clip clamping ring 2 from the rear side to the front side of the clip member 1 in the body cavity to forcibly close the clip member 1 is an endoscopic treatment. This is done with an endoscopic clip device passed through a tool guide tube. Since such an endoscopic clip device is well known from the above-mentioned patent document 1 and the like, the detailed illustration and explanation thereof will be omitted. However, the clip member 1 is engaged with the rear end portion 1b of the clip member 1 from the rear side. In the state where 1 is held, the clip fastening ring 2 may be operated so as to be pushed forward by the sheath. Alternatively, the clip member 1 may be pulled backward with an operation wire engaged with the rear end 1b of the clip member 1 in a state where the clip fastening ring 2 is held in contact with the distal end of the sheath.

  FIG. 6 and FIG. 7 are a side view and a plan partial sectional view of the clip member 1 in such a state that the clip member 1 is forcibly closed by the clip tightening ring 2, and the clip tightening ring 2 is A cross section is shown. The clip tightening ring 2 is in contact with the forward stopper portion S of the clip member 1 and the forward movement of the clip tightening ring 2 is restricted, and the portion of the clip tightening ring 2 that covers the tightening ring locking portion B is slightly expanded in diameter. It is elastically deformed.

  And since the coil wire material of about 1 to 2 windings of the cutting edge of the clip tightening ring 2 covers the coil engagement depression K, FIG. 8 illustrating a cross section cut along the line BB in FIG. As shown, the clip tightening ring 2 is engaged in a state of being elastically cut into the coil engagement recess K from the outside by the elasticity of the coil wire itself. Accordingly, when the coil wire rod for the most cutting edge of the clip tightening ring 2 enters the coil engagement recess K from the tightening ring locking portion B, a click feeling is generated, and the clip member 1 is clipped. The operator can perceive with hand feeling that the ring is fully closed by the attached ring 2.

  Then, the static force of the clip tightening ring 2 with respect to the clip member 1 is greatly increased not only by the frictional resistance in the tightening ring locking portion B but also by the engagement of the clip tightening ring 2 with the coil engagement recess K. Therefore, even if a strong external force acts on the clip member 1 from the body tissue or the like after the clip member 1 is placed in the body with the body tissue sandwiched therebetween, the clip fastening ring 2 is retracted and the clip member 1 A stable clipping state is maintained without causing the tightening force to loosen.

  In addition, the coil engagement dent K may be formed in a size with which the coil wire rod in a range of about half or more of the clip fastening ring 2 is engaged.

The exploded perspective view of the clip for endoscopes of an embodiment of the invention. The side view in the state where the clip for endoscopes of an embodiment of the invention fully opened. The top view in the state where the clip for endoscopes of an embodiment of the invention fully opened. The expanded view of the clip member of embodiment of this invention. Sectional drawing of the state cut | disconnected by the AA of FIG. 2 of the clip for endoscopes of embodiment of this invention. The side view of the state where the clip for endoscopes of an embodiment of the invention closed fully. The plane fragmentary sectional view in the state where the clip for endoscopes of an embodiment of the invention was fully closed. Sectional drawing of the state cut | disconnected by the BB line of FIG. 6 of the clip for endoscopes of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Clip member 1b ... Rear end part 1c ... Rear side parallel part 1d ... Intermediate | middle circular arc-shaped part 1e ... Front side arm part 2 ... Clip clamping ring B ... Tightening ring latching part K ... Coil engagement hollow S ... Advance Stopper

Claims (4)

When the rear end portion is bent back and no external force is applied, a clip member made of a material having a spring property so as to expand toward the front, and is fitted on the clip member In an endoscope clip provided with an annular clip tightening ring that elastically deforms the clip member by moving it from the rear side to the front side of the clip member to forcibly close the clip member,
The clip tightening ring is formed by winding a coil wire having a spring property into a pipe shape ,
Wherein the clip member, the clip member is the clip tightening ring by depression coil engaging coil wire is engaged in at least most advanced portion of the clip tightening ring when it is in a state of completely closed fills the shape formed A clamping ring locking portion is formed at a position adjacent to the rear side of the coil engagement recess to elastically deform the clip clamping ring that engages with the coil engagement recess in a state where the diameter is expanded . An endoscopic clip characterized by that. The endoscope clip according to claim 1, wherein the clip member includes:
A rear parallel portion formed in a straight line in the front-rear direction at a rear portion of the clip member so that the clip member is in a predetermined fully open state when the clip tightening ring is fitted therein; ,
When it is formed so as to expand outwardly in an arc from the front end portion of the rear side parallel part, and the clip fastening ring is pushed to move from the rear to the front in a state of being fitted there When the clip member is gradually elastically deformed to the closed state and the pushing force from the rear side against the clip fastening ring is released, the clip member expands due to the elasticity of the clip member and acts to return the clip fastening ring to the rear side. An intermediate arcuate part;
A front side arm portion is formed which extends forward from the tip portion of the intermediate arcuate portion so that the clip member is in a predetermined fully closed state when the clip fastening ring is fitted therein. Endoscopic clip. 3. The endoscope clip according to claim 2, wherein the clip member is bent in a direction in which the clip member extends toward the intermediate arcuate part with an angle change at a boundary portion between the rear parallel part and the intermediate arcuate part. Endoscope clip formed in a different shape . The endoscope clip according to claim 2 or 3, wherein the coil engagement recess and the fastening ring locking portion are formed near a rear end of the front arm portion. .

Images