JP2005218683A - Operation part of holding forceps for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly practical operation part of holding forceps for an endoscope which has no possibility to drop an object to be held by having a stopper for keeping a proper state of holding the object to be held and facilitating the positioning operation of the stopper. <P>SOLUTION: A wire operation piece 23 connected to the proximal end of an operation wire 13 is engaged, in the state of being movable back and forth in the axial direction of the operation wire 13, with an operation part main body 21 connected with the proximal end of a flexible sheath 11. A spiral movement stopper 25 for regulating the movement of the wire operation piece 23 by abutting on the wire operation piece 23 when the wire operation piece 23 is moved in a direction of opening the holding forceps 12 is screwed to the operation part main body 21 so as to move spirally in the direction of forward and backward movement of the wire operation piece 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an operation unit of an endoscopic grasping forceps.

  The grasping forceps are used for various applications. For example, when performing transendoscopic mucosal resection, as shown in FIG. 4, the mucosal portion 100 to be excised is easily bound with the high-frequency snare 30. It plays a role of holding the gripping forceps 10 in a lifted state.

  When used for such an application, the operator who operates the operation unit of the grasping forceps 10 needs to keep the grasping forceps piece 12 in a closed state. However, if the operating force is loosened, the grasping forceps piece 12 may open and the mucosa 100 to be excised may be removed, and it may be necessary to redo everything from the beginning.

Therefore, a stopper for keeping the grasping forceps piece 12 in the closed state is provided in the operation portion, and the state in which the mucous membrane portion 100 to be excised is held by the grasping forceps 10 even if the operator does not keep the closing operation. There is an operation part of a treatment tool that can be used (for example, Patent Document 1).
JP-A-11-332870, FIG. 1, FIG. 5, FIG.

  However, since the structure described in FIG. 1 of Patent Document 1 has a structure in which a stopper that is slidably disposed on the operation portion is fixed to the operation portion with a manual screw attached to the stopper, the stopper is moved and fixed separately. It is necessary to perform the operation, and the operation of positioning the stopper is troublesome. In addition, when the manual screw is tightened, the stopper may move, and the closing force of the gripping forceps at the tip may be loosened and the gripping target may be removed.

  Moreover, in what was described in FIG.5 and FIG.9 of patent document 1, it is a structure which latches a stopper to the some groove | channel or ratchet nail | claw etc. which were formed at intervals, Comprising: The positioning location of a stopper is discontinuous. Therefore, there is a case where the stopper is not present at a position that is just right for the gripping condition that is different every time, and the state in which the gripping target is properly gripped cannot be maintained.

  Therefore, the present invention has a stopper that can keep the gripping object properly held at any time, and the positioning operation of the stopper is easy and the gripping object may be removed during the positioning. An object of the present invention is to provide an operation part of a grasping forceps for an endoscope which is not highly practical.

  In order to achieve the above-described object, the operation portion of the grasping forceps for endoscope of the present invention has an operation wire inserted through the flexible sheath so as to be movable forward and backward in the axial direction from the proximal end side of the flexible sheath. By advancing and retracting, the pair of grasping forceps pieces arranged at the distal end of the flexible sheath are connected to the proximal end of the flexible sheath at the operation portion of the grasping forceps for endoscope that is opened and closed like a bowl. When the wire operation piece connected to the base end of the operation wire is engaged with the operation unit main body so as to be able to advance and retract in the axial direction of the operation wire, and the wire operation piece moves in a direction to open the grasping forceps piece A screw stopper that abuts on the wire operation piece and restricts the movement of the wire operation piece is screwed to the operation portion main body so as to be screwed in the advancing and retreating direction of the wire operation piece.

  In addition, it is easy to use if the indicator for displaying the advance / retreat position of the wire operation piece with respect to the operation unit body is provided on the operation unit body.

  According to the present invention, the screw stopper that abuts on the wire operation piece and restricts the movement of the wire operation piece when the wire operation piece moves in the direction of opening the grasping forceps piece is screwed in the advancing and retreating direction of the wire operation piece. Since it is screwed to the operation unit main body so as to move, it is possible to keep the gripping object properly gripped at any time by adjusting the stopper position, and the positioning operation of the stopper is easy and positioning. It is possible to obtain high practicality without fear of removing the object to be grasped during the process.

  A wire operation piece connected to the proximal end of the operation wire is engaged with the operation unit main body connected to the proximal end of the flexible sheath so as to be movable forward and backward in the axial direction of the operation wire. A screw stopper that abuts the wire operation piece and restricts the movement of the wire operation piece when the gripping forceps piece is moved in the opening direction is attached to the operation unit main body so as to be screwed in the advancing and retreating direction of the wire operation piece. Threaded arrangement.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a grasping forceps 10, and a flexible sheath 11 that can be inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown) is formed by, for example, a tightly wound coil pipe or the like, and has a hook shape. A pair of grasping forceps pieces 12 that can be freely opened and closed is attached to the distal end portion of the flexible sheath 11.

  An operation wire 13 is inserted into the flexible sheath 11 so as to be movable back and forth in the axial direction. The distal end of the operation wire 13 is connected to a link mechanism 14 disposed in the distal end of the flexible sheath 11 to open and close the grasping forceps piece 12, and is operated from the proximal end side of the flexible sheath 11. The grasping forceps piece 12 is opened and closed by moving the wire 13 back and forth.

  The distal end portion of the operation unit main body 21 is connected to the proximal end of the flexible sheath 11, and the operator's first finger is passed through the proximal end that is the opposite end of the operation unit main body 21. A fixed finger hook 22 is attached.

  A wire operation piece 23 is attached to an intermediate portion of the operation portion main body 21 formed in a substantially straight rod shape so as to be movable back and forth in the axial direction. The outer peripheral surface of the wire operation piece 23 is formed in a shape in which both front and rear ends protrude over the entire circumference, and the operator can engage the second finger and the third finger in a portion therebetween.

  The wire operation piece 23 is connected to the proximal end of the operation wire 13 drawn straight from the proximal end of the flexible sheath 11. Therefore, as shown by the arrow A, when the wire operation piece 23 is moved forward and backward in the axial direction with respect to the operation portion main body 21, the grasping forceps piece 12 is opened and closed in a hook shape via the operation wire 13. More specifically, when the operation wire 13 is pulled by the wire operation piece 23, the grasping forceps piece 12 is closed, and when the operation wire 13 is pushed, the grasping forceps piece 12 is opened.

  A screw stopper 25 that restricts the movement of the wire operation piece 23 in the pushing direction by contacting the end surface of the wire operation piece 23 is disposed adjacent to the position closer to the tip than the wire operation piece 23. .

  A female screw 25 a is formed on the inner peripheral portion of the screw stopper 25 formed in a substantially cylindrical shape, and the female screw 25 a is a male screw formed on the outer peripheral portion at a position near the tip of the operation unit main body 21. Screwed into the screw 21a.

  With such a configuration, when an operation for moving the wire operation piece 23 in the pushing direction is performed, the end surface of the wire operation piece 23 comes into contact with the screw stopper 25 as shown by a two-dot chain line, and the grasping forceps piece 12 is moved. It can no longer be opened.

  Such a screw stopper 25 moves (screws) in the axial direction of the operation unit main body 21 by rotating around the axis of the operation unit main body 21 to adjust the contact position with respect to the wire operation piece 23 steplessly. It is possible to prevent the grasping forceps piece 12 from being opened further at an arbitrary opening angle.

  Therefore, as shown in FIG. 2, when performing transendoscopic mucosal resection, the excision target mucosa 100 is grasped by the grasping forceps piece 12 so as to be easily bound by the high-frequency snare 30. When pulled up, the screw stopper 25 is screwed and brought into contact with the wire operation piece 23.

  By doing so, the gripping forceps piece 12 can be kept in the closed state without applying finger force to the wire operation piece 23, and the position of the screw stopper 25 can be adjusted steplessly. Therefore, even if the gripping condition is different every time, an appropriate gripping state can be obtained at any time.

  Then, the screw stopper 25 moves if it is rotated, and if it is not touched, its position is maintained, so that the operation is very easy. The treatment by the high frequency snare 30 is performed while the mucous membrane part 100 to be excised is gripped. Then, the grasping forceps piece 12 may be opened by screwing the screw stopper 25 in the retracting direction.

  As shown in FIG. 3, the advance / retreat position of the wire operation piece 23 relative to the operation unit main body 21 is displayed on the outer peripheral surface of the operation unit main body 21 located inside the front end of the screw stopper 25. By forming the index 27 for this purpose, the adjustment position of the screw stopper 25 (that is, the maximum opening angle of the grasping forceps piece 12) can be visually recognized at hand, which contributes to grasping the situation inside the body.

It is a side fragmentary sectional view of the grasping forceps for endoscopes of the 1st example of the present invention. It is side surface fragmentary sectional view of the use condition of the grasping forceps for endoscopes of the 1st Example of this invention. It is side surface fragmentary sectional drawing of the grasping forceps for endoscopes of the 2nd Example of this invention. It is a perspective view of the state in the body in which transendoscopic mucosal resection is performed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Grip forceps 11 Flexible sheath 12 Grip forceps piece 13 Operation wire 21 Operation part main body 21a Male screw 23 Wire operation piece 25 Screw stopper 25a Female screw

Claims (2)

A pair of grasping forceps disposed at the distal end of the flexible sheath by operating the operation wire inserted and disposed in the flexible sheath so as to be movable back and forth in the axial direction from the proximal end side of the flexible sheath. In the operation part of the grasping forceps for endoscope whose piece is opened and closed like a bowl,
A wire operation piece connected to the proximal end of the operation wire is engaged with the operation portion main body connected to the proximal end of the flexible sheath so as to be movable forward and backward in the axial direction of the operation wire. When the wire operation piece moves in the direction to open the gripping forceps piece, a screw stopper that abuts on the wire operation piece and restricts the movement of the wire operation piece is screwed in the advancing and retreating direction of the wire operation piece. Thus, the operation part of the grasping forceps for endoscope which is screwed to the operation part main body. The operation part of the grasping forceps for an endoscope according to claim 1, wherein an indicator for displaying an advance / retreat position of the wire operation piece with respect to the operation part body is provided on the operation part body.

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