JP2004194849A - Grasping forceps for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grasping forceps for an endoscope smoothly opening/closing three or more grasping pieces without moving in the front/rear direction and easily and surely grasping an object to be grasped without being restricted by the shape of the object to be grasped. <P>SOLUTION: At least, three grasping pieces 3 are disposed from the tip part 2 of a sheath 1 faced to the front, the base end parts of the respective grasping pieces are turnably supported at the outside position of the axis in such a manner as circumferentially deviating the respective positions in order in the tip part 2 of the sheath 1 so that the respective grasping pieces 3 are opened/closed around their base parts. The tip portions 4b of an operation wire 4 inserted and disposed in the sheath 1 are made to pass through a space toward the axis of the tip part 2 of the sheath 1 and connected to the respective grasping pieces 3 facing from the inside. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grasping forceps for an endoscope.
[0002]
[Prior art]
The grasping forceps for an endoscope can open and close a plurality of grasping pieces provided at a distal end portion of a sheath inserted into and removed from a treatment instrument insertion channel of the endoscope from a hand side. The structure of grasping forceps for an endoscope is roughly classified into two types.
[0003]
That is, in the configuration shown in FIG. 4, a plurality of gripping pieces 82 formed in a shape in which the front side is spread outward by a spring wire or the like are arranged in the distal end portion of the sheath 81 so as to be freely protruded and retracted. When the piece 82 is pushed out of the sheath 81 by the operation wire 83, it expands by its own elasticity, and when it is pulled into the sheath 81, it elastically deforms to a narrowed state (for example, Patent Document 1).
[0004]
5, a pair of gripping pieces 92 are rotatably supported on a distal end portion of a sheath 91 by a support shaft 93, and a driving arm 94 formed integrally with the gripping pieces 92 is operated by an operation wire 95. By driving, a pair of gripping pieces 92 open and close like a beak centering on a support shaft 93 (for example, Patent Document 2).
[0005]
[Patent Document 1]
JP-A-8-38496 [Patent Document 2]
JP-A-63-151111
[Problems to be solved by the invention]
However, as shown in FIG. 4, with a mechanism in which the gripping piece 82 moves in and out of the sheath 81, when the gripping piece 82 is closed, the gripping piece 82 retreats at the same time as the gripping piece 82 is retracted. It is not uncommon for the user to be unable to grasp easily, and the grasping operation is very difficult.
[0007]
In addition, as shown in FIG. 5, in the case where the gripping piece 92 opens and closes in a beak shape, since the gripping object is merely sandwiched from two directions, when the gripping object is round, the gripping piece 92 is closed. In some cases, the object to be gripped has escaped from between the gripping pieces 92, making it difficult to grip the object to be gripped.
[0008]
However, if three or more gripping pieces 92 are provided, a plurality of drive arms 94 arranged to extend rearward from the support shaft 93 interfere with each other, so that the gripping pieces 92 open and close. Can not.
[0009]
Therefore, the present invention is to open and close three or more gripping pieces smoothly so as not to move in the front-back direction, and to easily and reliably grip the gripping object without being limited by the shape of the gripping object. An object of the present invention is to provide a grasping forceps for an endoscope that can be used.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the grasping forceps for an endoscope of the present invention has at least three grasping pieces arranged forward from the distal end portion of the sheath, and each grasping piece is centered on their base end portion. The base end portion of each gripping piece is sequentially shifted in the circumferential direction to the distal end portion of the sheath so as to be opened and closed, and is rotatably supported at a position outside the axis line, respectively, and the distal end of an operation wire inserted and arranged in the sheath. The portion is passed through a space closer to the axis of the distal end portion of the sheath than the support portion of each gripping piece at the distal end portion of the sheath, and is connected to each gripping piece from the inner surface side.
[0011]
Note that the gripping pieces may be arranged in an axially symmetric positional relationship around the axis of the distal end portion of the sheath.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 3 shows the entire configuration of the grasping forceps for an endoscope, and a flexible sheath 1 inserted into and removed from a treatment tool insertion channel of an endoscope (not shown) is, for example, a stainless steel wire having a fixed diameter. It is formed by tightly winding. However, it may be formed of a tetrafluoroethylene resin tube or the like.
[0013]
Three gripping pieces 3 are openably and closably attached to a distal end base 2 fixedly connected to the distal end of the flexible sheath 1. In FIG. 3, the open state is shown by a solid line, and the closed state is shown. Is indicated by a two-dot chain line.
[0014]
An operation wire 4 for opening and closing the three gripping pieces 3 is inserted through the entire length of the flexible sheath 1 so as to be able to advance and retreat in the axial direction, and an operation unit for operating the operation wire 4 forward and backward. 10 is connected to the proximal end of the flexible sheath 1.
[0015]
The operation unit 10 has a fixed finger hook 12 provided at a base end of an elongated operation unit main body 11, and a base 4 a of the operation wire 4 is connected to a movable finger hook 13 slidably mounted in the longitudinal direction of the operation unit main body 11. It has been configured.
[0016]
As a result, the sliding operation of the movable finger rest 13 as shown by the arrow A causes the operation wire 4 to advance and retreat in the flexible sheath 1, and the gripping piece 3 opens and closes at the distal end side of the flexible sheath 1. do.
[0017]
FIG. 1 is a perspective view of a distal end portion of a flexible sheath 1 provided with such a gripping piece 3, and FIG. 2 is a side view of one gripping piece 3 of the three gripping pieces 3. It is a side sectional view of a state.
[0018]
The flexible sheath 1 is spread so that the distal end portion covers the distal end base 2 and is fixed to the distal end base 2 by brazing or the like, and the operation wire 4 is branched into three near the distal end. However, a connection pipe or the like may be used for such a branch portion, and three operation wires 4 may be arranged side by side over the entire length.
[0019]
The distal end cap 2 is made of, for example, a round bar of stainless steel, and a hole through which the three operation wires 4 are loosely inserted in a state where the three operation wires 4 are arranged is formed in the axial position thereof, and the flexible sheath 1 is connected and fixed. The portion near the rear end of the end cap 2 is formed one step thinner so that no step is formed on the outer surface of the connecting portion.
[0020]
In the distal end portion of the distal end cap 2, three slits 2a opening in the distal end surface are formed radially around the axis at intervals of 120 °, and the narrow portion on the base end side is sandwiched by the slits 2a. The gripping piece 3 is rotatably supported by a support shaft 5 attached to the distal end cap 2 so as to cross the slit 2a so as to open and close around a base end portion.
[0021]
In this manner, the positions of the base portions of the three gripping pieces 3 are sequentially shifted by 120 ° so that the base portions of the three gripping pieces 3 are axially symmetrical about the extension of the axis of the distal end portion of the flexible sheath 1. The distal end portions 4b of the three operating wires 4 which are rotatably arranged at positions outside the axis of the base 2 and pass through the axial position of the end base 2 face the gripping pieces 3 from the inner surface side. In this state, it is connected and fixed by brazing or the like.
[0022]
With such a configuration, when the operation wire 4 is pushed in remotely from the operation unit 10 side, as shown in FIG. 2, each gripping piece 3 is shown by a solid line from a closed state shown by a two-dot chain line. When the operation wire 4 is pulled from the operation section 10 side, the gripping piece 3 is closed.
[0023]
Therefore, since the three gripping pieces 3 open and close at 120 ° intervals around the support shaft 5 without moving in the front-rear direction, the three gripping pieces 3 are inserted into the treatment tool insertion channel of the endoscope, and the shape of the gripping object in the body cavity is obtained. The object to be gripped can be easily and reliably gripped without being restricted by the above.
[0024]
Note that the present invention is not limited to the above embodiment, and for example, four or more gripping pieces 3 may be arranged.
[0025]
【The invention's effect】
According to the present invention, since at least three gripping pieces can be smoothly opened and closed around the base end without moving in the front-rear direction, the gripping target object is not limited by the shape of the gripping object and the like. Can be easily and reliably gripped.
[Brief description of the drawings]
FIG. 1 is a perspective view of a distal end portion of an endoscope grasping forceps according to an embodiment of the present invention.
FIG. 2 is a partial side sectional view of a distal end portion of the grasping forceps for an endoscope according to the embodiment of the present invention.
FIG. 3 is a side sectional view showing the entire configuration of the grasping forceps for an endoscope according to the embodiment of the present invention.
FIG. 4 is a perspective view of a first example of a distal end portion of a conventional endoscope grasping forceps.
FIG. 5 is a side cross-sectional view of a second example of a distal end portion of a conventional grasping forceps for an endoscope.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 flexible sheath 2 distal end cap 3 gripping piece 4 operating wire 4b distal end portion 5 support shaft 10 operating section

Claims (2)

At least three gripping pieces are arranged forward from the distal end of the sheath, and the proximal end of each gripping piece is positioned at the distal end of the sheath so that each gripping piece opens and closes around their proximal end. In the same manner as described above, the distal end portion of the operation wire inserted and disposed in the sheath is supported at the distal end portion of the sheath by supporting the gripping pieces at the distal end portion. A grasping forceps for an endoscope, wherein the grasping forceps is passed through a space closer to an axis of a distal end portion of the sheath from a portion to face each of the grasping pieces from the inner surface side. The grasping forceps for an endoscope according to claim 1, wherein each of the grasping pieces is arranged in an axially symmetric positional relationship around an axis of a distal end portion of the sheath.

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