JP4611771B2 - Endoscopic treatment tool - Google Patents

Description

  The present invention relates to an endoscope treatment tool.

Although there are those that perform various operations as an endoscope treatment tool, by operating the operation wire inserted and removed in the sheath inserted into and removed from the endoscope treatment tool insertion channel in the axial direction, Many treatment tools are used in which a distal treatment member connected to the distal end of an operation wire protrudes from the distal end portion of the sheath (for example, Patent Document 1).
JP 2002-153484 A

  In order to accurately guide the distal treatment member protruding from the distal end of the sheath to the target affected area, the direction of the distal treatment member protruding from the distal end of the sheath can be arbitrarily changed by remote operation from the hand side. Is desirable.

  However, the conventional endoscopic treatment instrument described in Patent Document 1 does not have such a function, and is an endoscopic treatment instrument that is not a type in which the distal treatment member projects from the distal end of the sheath. Some have a bending function, but in such a case, it is necessary to install an operation wire to bend the distal end of the sheath and insert it into the sheath, which makes the structure and operation complicated and realistic. (For example, JP-A-9-262239, JP-A-11-42232, etc.).

  Accordingly, an object of the present invention is to provide an endoscopic treatment tool that can greatly change the direction of the distal treatment member projecting from the distal end portion of the sheath from the proximal side in a small space by an extremely simple structure and operation. To do.

  In order to achieve the above object, an endoscope treatment tool according to the present invention is configured to advance and retract in the axial direction an operation wire that is inserted through a sheath inserted into and removed from a treatment tool insertion channel of an endoscope. In the endoscopic treatment instrument configured such that the distal treatment member coupled to the distal end of the operation wire protrudes and sinks from the distal end portion of the sheath, the distal treatment member faces forward in the vicinity of the coupling portion between the manipulation wire and the distal treatment member A stopper surface is formed so that the stopper wall that abuts when the stopper surface moves forward is inclined with respect to the stopper surface and provided at the distal end portion of the sheath, and the slit through which the distal treatment member passes is located at the stopper surface of the stopper wall. It is formed to a depth that does not reach the axial position of the sheath inward from the outer periphery of the offset position, and pushes the operation wire forward from the proximal end side to push the stopper surface against the stopper wall By shining, in which the direction of the distal end treatment member protruding from the distal end portion of the sheath was made to vary in response to the inclination direction of the stopper wall against the stopper surface.

  The slit may be formed so as not to prevent the distal treatment member from protruding straight in a direction parallel to the axis of the sheath.

  According to the present invention, the operation wire for causing the distal treatment member to protrude and retract from the distal end portion of the sheath is pushed in from the proximal side, so that the stopper surface formed at the connecting portion between the operation wire and the distal treatment member is the stopper. Since the direction of the distal treatment member that is pressed against the wall and protrudes from the distal end portion of the sheath can be changed, the orientation of the distal treatment member can be arbitrarily changed from the proximal side by an extremely simple structure and operation. Since the slit through which the distal treatment member passes is formed so shallow that it does not reach the axial position of the sheath, the proximal end position of the distal treatment member is displaced from the axial position of the sheath. The space is sufficiently secured in the sheath, and the protrusion angle of the tip treatment member can be changed greatly in a small space, making the tip treatment member easy. One accurately can be induced to the target affected area.

  The distal end treatment member connected to the distal end of the operation wire protrudes from the distal end portion of the sheath by moving the operation wire inserted and removed in the sheath inserted into and removed from the treatment instrument insertion channel of the endoscope in the axial direction. In the endoscope treatment tool configured to be immersed, a stopper wall facing forward is formed in the vicinity of the connection portion between the operation wire and the distal treatment member, and the stopper wall contacts when the stopper surface moves forward Is provided at the distal end portion of the sheath so as to be inclined with respect to the stopper surface, and the slit through which the distal treatment member passes does not reach the axial position of the sheath inward from the outer peripheral portion of the stopper wall closest to the stopper surface. The distal end of the sheath protrudes from the distal end portion of the sheath by forming the depth and pushing the operation wire forward from the proximal end side and pressing the stopper surface against the stopper wall. Orientation of the member so as to vary in response to the inclination direction of the stopper wall against the stopper surface.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a plan view showing the overall configuration of the endoscope treatment tool, and FIG. 3 is a side sectional view. The endoscope is inserted into and removed from a treatment tool insertion channel of the endoscope (not shown), such as ethylene tetrafluoride resin. A conductive operation wire in which a round bar-shaped high-frequency electrode 2 (tip treatment member) disposed at the distal end portion of the electrically insulating sheath 1 having flexibility as described above is inserted and disposed in the sheath 1 so as to freely advance and retract. 3 is arranged so as to project from the tip of the sheath 1. The operation wire 3 is formed of a stranded wire rich in flexibility.

  Reference numeral 10 denotes an operation portion provided on the proximal end side of the sheath 1, and a slide operation piece is formed in which a slit 12 is formed in the operation portion main body 11 connected to the proximal end of the sheath 1 and is slidable along the slit 12. The base end of the operation wire 3 is fixed to 13, and the operation wire 3 advances and retreats in the axial direction within the sheath 1 by sliding the slide operation piece 13.

  A high-frequency power cord (not shown) can be connected to the connection terminal 14 attached to the slide operation piece 13, and a high-frequency current can be applied to the high-frequency electrode 2 via the operation wire 3 when necessary. it can.

  4 shows the vicinity of the distal end of the sheath 1, and 4 is a connecting member for firmly connecting the distal end of the operation wire 3 and the proximal end of the high-frequency electrode 2, and the axis of the conductive cylindrical metal material A hole corresponding to the outer diameter of the operation wire 3 and a hole corresponding to the outer diameter of the high-frequency electrode 2 are formed at positions from the rear and the front to the intermediate position.

  Then, the distal end portion of the operation wire 3 and the proximal end portion of the high-frequency electrode 2 are respectively inserted from the rear and the front and fixed by silver brazing or the like, and the operation wire 3 and the high-frequency electrode 2 are connected by the connecting member 4. ing.

  A stopper member 5 made of an electrical insulating material is tightly press-fitted and fixedly attached to the most distal portion of the sheath 1. Reference numeral 5z denotes a protrusion protruding from the outer peripheral surface of the stopper member 5 so as to bite into the inner wall of the sheath 1 in order to prevent the stopper member 5 from coming out of the sheath 1. However, the fixing means for the stopper member 5 with respect to the sheath 1 may be any means such as screwing. It should be noted that the axis 1x of the sheath 1 and the axis 5x of the stopper member 5 coincide with each other at the position where the stopper member 5 is attached to the distal end of the sheath 1.

  The stopper member 5 is slightly larger than the diameter of the high-frequency electrode 2 as shown in FIG. 5 illustrating the VV cross section in FIG. 4 and FIG. 6 illustrating the state where the stopper member 5 is separated from the sheath 1. A slit 5a having a width smaller than the diameter of the connecting member 4 is formed over the entire length in a direction parallel to the axis 5x, and a long groove 1a connected to the slit 5a of the stopper member 5 is formed at the tip of the sheath 1 at the tip of the sheath 1. It is formed in a direction parallel to the axis 1x so as to open to the side.

  Further, the rear end wall (stopper wall) 5b of the stopper member 5 with which the front end surface (stopper surface) 4a of the connecting member 4 abuts when the operation wire 3 is moved forward is inclined with respect to the axis 1x of the sheath 1. It is formed in the shape of a slope.

  On the other hand, since the stopper surface 4a is formed in a direction perpendicular to the axis 1x of the sheath 1, the stopper wall 5b and the stopper surface 4a are relatively inclined. Note that the stopper surface 4a does not necessarily have to be perpendicular to the axis 1x of the sheath 1, and may face obliquely forward.

  The slit 5a formed in the stopper member 5 is an axis of the stopper member 5 from the end of the rear end position of the stopper wall 5b (that is, the position where the stopper wall 5b is closest to the stopper surface 4a) 5e toward the center. It is formed to a depth that does not reach the position 5x (= the axis 1x of the sheath 1).

  However, as shown in FIG. 4, the depth A of the slit 5 a is formed to be greater than or equal to the sum of the radial dimension r <b> 4 of the connecting member 4 and the radial dimension r <b> 2 of the high-frequency electrode 2. That is, A ≧ r4 + r2. Therefore, the high frequency electrode 2 does not tilt when passing through the slit 5a, and the high frequency electrode 2 can be projected straight in a direction parallel to the axis 1x of the sheath 1.

  In the endoscope treatment tool of the embodiment configured as described above, the high-frequency electrode 2 protrudes and retracts from the distal end of the sheath 1 by moving the operation wire 3 back and forth from the operation unit 10 side. When the stopper surface 4a is pressed against the stopper wall 5b by pushing forward from the portion 10 side, the connecting member is brought into contact with the stopper wall 5b in the entire surface as shown in FIG. The direction of 4 changes.

  Accordingly, the vicinity of the tip of the operation wire 3 connected to the rear of the connecting member 4 bends in the internal space 1b of the sheath 1, and the direction of the high-frequency electrode 2 connected to the front of the connecting member 4 is the slit 5a of the stopper member 5. It changes in the diagonally forward direction inside (and within the long groove 1a of the sheath 1).

  At this time, the inclination direction of the stopper wall 5b and the position of the slit 5a are formed in correspondence with each other, and the direction of the high-frequency electrode 2 that changes when the stopper surface 4a strongly contacts the stopper wall 5b, and the stopper wall 5b. Thus, the direction in which the high frequency electrode 2 is guided coincides, so that the direction of the high frequency electrode 2 changes smoothly along the slit 5a.

  Since the slit 5a is formed so shallow that it does not reach the axis 1x of the sheath 1, as shown in FIG. 1, the base end position of the high-frequency electrode 2 is set to the stopper wall 5b from the position of the axis 1x of the sheath 1. Since the internal space 1b for deflecting the operation wire 3 by deflecting toward the rear end position 5e is sufficiently secured, the protruding angle of the high-frequency electrode 2 can be greatly changed in a small space, and the depth A of the slit 5a Is the same as the sum of the radial dimension r4 of the connecting member 4 and the radial dimension r2 of the high-frequency electrode 2 (ie, A = r4 + r2), the maximum protrusion angle allowed in the internal space 1b of the sheath 1 can be obtained.

  In this way, the direction of the high-frequency electrode 2 can be arbitrarily changed by remote operation from the hand side using the operation wire 3 for projecting and retracting the high-frequency electrode 2. If the operating force for pushing 3 is loosened, the distal end portion of the operating wire 3 and the high-frequency electrode 2 return to the original straight state as shown in FIG.

It is side surface sectional drawing of the state from which the direction of the high frequency electrode of the front-end | tip part of the treatment tool for endoscopes of the Example of this invention changed. It is a top view which shows the whole structure of the treatment tool for endoscopes of the Example of this invention. It is side surface sectional drawing which shows the whole structure of the treatment tool for endoscopes of the Example of this invention. It is side surface sectional drawing of the front-end | tip part of the treatment tool for endoscopes of the Example of this invention. It is VV sectional drawing in FIG. 4 of the treatment tool for endoscopes of the Example of this invention. It is a perspective view in the state where the stopper member was separated from the sheath of the treatment tool for endoscopes of the example of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheath 1x Axis 1a Long groove 1b Internal space 2 High frequency electrode (tip treatment member)
3 Operation wire 4 Connecting member 4a Stopper surface 5 Stopper member 5a Slit 5b Stopper wall 5e Rear end position (position closest to the stopper surface)
5x Axis A Slit depth

Claims (2)

The distal treatment member connected to the distal end of the manipulation wire is moved forward and backward in the axial direction by operating the manipulation wire inserted and removed in the sheath inserted into and removed from the treatment instrument insertion channel of the endoscope. In an endoscopic treatment tool configured to project from,
A stopper surface facing forward is formed in the vicinity of the connecting portion between the operation wire and the distal treatment member, and a stopper wall that abuts when the stopper surface moves forward is inclined with respect to the stopper surface, so that the sheath A slit through which the distal treatment member passes is formed at a depth that does not reach the axial position of the sheath inward from the outer peripheral portion of the stopper wall closest to the stopper surface, By pushing the operation wire forward from the base end side and pressing the stopper surface against the stopper wall, the direction of the distal treatment member protruding from the distal end portion of the sheath is in the inclination direction of the stopper wall with respect to the stopper surface. An endoscopic treatment tool characterized by correspondingly changing.   The endoscope treatment instrument according to claim 1, wherein the slit is formed in a state that does not prevent the distal treatment member from protruding straight in a direction parallel to the axis of the sheath.

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