JPH02295555A - Forceps for endoscope - Google Patents

Abstract

PURPOSE:To obtain a forceps for endoscope having satisfactory durability without danger that buckling damage is generated in an operating wire at the time of pressing operation by providing an inserting part with a stopper which limits the maximum pressing quantity of a driving bar to the inserting part. CONSTITUTION:The tip part of a driving bar 20 is positioned in a linking base 21 and when the driving bar is pressed into an inserting part 10, the driving bar is abutted to a reference end face 12a of a coil pipe 12. Namely, the outer diameter of the driving bar 20 is formed larger than the inner diameter of the coil pipe 12 and further, the base end part of the coil pipe 12 is cylindrically formed by silver-alloy brazing, etc. Then, the base end face 12a is ground to be plane. Thus, when the driving bar 20 is pressed into the inserting pat 10, the stopper is formed in the side of the inserting part 10 and an operating stroke S is not affected by the deviation of link with an operation part side, etc. Accordingly, the forceps can be always maintained in an optimum state and satisfactory durability can be obtained not to generate the buckling in the operating wire.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to forceps for an endoscope, which are used by being inserted into a forceps channel of an endoscope. [Conventional technology] Endoscopic forceps include, in addition to standard biopsy forceps, grasping forceps for grasping foreign bodies, and hot biopsy forceps for performing biopsies while cauterizing with high-frequency current. ．．
The present invention can be applied to any of these, but we will explain it using hot biopsy forceps as an example. Figure 6 shows a conventional hot biopsy forceps for endoscopy. Endoscopic hot biopsy forceps are generally configured such that the insertion section 50 and the operation section 60 are separable. In the figure, 51 is an insulation-coated town flexible pipe, and at its tip,
A pair of cup-shaped electrodes 52 that can be opened and closed are provided.
The operating section main body 61 is detachably connected to the flexible tube 51,
A slider 62 is slidably provided. A drive rod 54 fixed to the base of an operating wire for opening and closing the cup-shaped electrode 52 is removably fixed to the slider 62 with screws. Reference numeral 63 denotes a hole bored in the slider 62 so as to insert the drive rod 54 therein. 64 is a connection terminal connected to a high frequency power source. In the conventional endoscopic hot biopsy forceps configured as described above, a stopper used when pushing the operating wire in order to open the cup-shaped electrode 52 is provided on the operating section 60 side. That is, the operating wire 53 is pushed to the position where the slider 62 collides with the stopper portion 61a of the operating section main body 6l. Therefore, S shown in Fig. 6 becomes the operating stroke. [Problems to be Solved by the Invention] However, the attachment and detachment of the insertion section 50 and the operating section 60 is not possible using the flexible tube 5.
There are two locations: one between the drive rod 54 and the slider 62, and the other between the drive rod 54 and the slider 62.
The positional relationship between the slider 62 and the slider 62 may be misaligned. 6th
The figure shows such a state, in which the drive rod 54, which should be inserted into the hole 63 to the deepest point and fixed, is fixed to the slider 62 at a position that extends forward by an amount of X. In this way, if the fixed position of the slider 62 and the drive rod 54 deviates, an accident may occur in which when the slider 62 is pushed all the way to the stopper portion 61a, the operating wire is pushed too much and buckles and is damaged. Was. The purpose of this invention is to eliminate such conventional drawbacks and to provide endoscopic forceps with excellent durability and no risk of buckling damage to the operating wire during a pushing operation. [Means for Solving the Problems] In order to achieve the above object, the endoscopic forceps of the present invention have the following features:
An opening/closing piece provided at the distal end of the insertion section formed by a flexible tube so as to be openable and closable; an operating wire inserted through the insertion section over substantially the entire length thereof; and an operation wire provided protruding from the side opening of the proximal end of the insertion section. , a drive rod that opens and closes the opening/closing piece via the operation wire by moving forward and backward in the axial direction; an operating section that is detachably attached to the proximal end side of the insertion section; and an operation section that is detachably attached to the drive rod. The endoscopic forceps includes a slider that is freely connected to the operating section and is slidably provided on the operating section to operate the driving rod forward and backward; It is characterized by being provided in the insertion section mentioned above. [Operation] When the drive rod is pushed into the insertion part, the maximum amount of push of the drive rod is regulated by the stopper, making it impossible to push the operating wire any further. Since both the drive rod and the stopper are provided in the insertion section, the maximum pushing amount is not affected by misalignment of the connection position between the operating section and the insertion section. [Example] An example will be explained with reference to the drawings. FIG. 3 shows the overall configuration of an endoscope hot biopsy forceps according to an embodiment of the present invention, which is composed of an insertion section 10 and an operation section 30, which are detachably connected to each other. ing. 31 is the main body of the operating section* 31a is a finger rest provided at the end thereof. 32 is a slider provided to be slidably engaged with the operating section main body 31. FIG. 4 shows the distal end of the insertion section 10. 1l is a flexible pipe, and is a tightly coiled pipe 12 made of stainless steel wire.
An electrically insulating and flexible synthetic resin outer skin 13 is coated on the outside. A pair of cup-shaped electrodes (opening/closing pieces) 14 made of stainless steel are supported at the tip of the flexible tube 1l so as to be freely openable and closable about a shaft 15. A known link mechanism l6 (details not shown) is connected to the rear of the cup-shaped electrode l4. 17 is a drive link that drives the link mechanism 16.

An operating wire l8 made of twisted conductive stainless steel wire is slidably inserted into the coil pipe 12 over almost its entire length, and its tip is fixed to the drive link 17 by silver brazing or the like. FIG. 5 shows the vicinity of the connecting portion between the insertion section 10 and the operating section 30. A fixed base 33 is provided inside the slider 32,
The contact 34 is fixed within the slider by a threaded portion 34a formed at the root thereof.

35 is a screw for preventing the screw portion 34a from coming off. Reference numeral 36 denotes an electrically insulating contact cover that is fixed with screws so as to surround the contact 34. 37, the base of the 5 flexible tube l1 is detachably attached to the operation unit main body 31.
This is a well-known connection part that connects to the , and detailed illustration of the structure is omitted. Reference numeral 20 denotes a stainless steel drive rod that is fixedly connected to the base end of the operating wire 18 in the insertion section 10, and is inserted into a hole 38 drilled in the fixing base 33 to connect to the threaded portion of the contact 34. The fixed base 33 is held down by 34a.
It is connected and fixed to. In this way, the contact point 34 is connected to the drive rod 20, the operating wire 18
and is electrically connected to the cup-shaped electrode 14 via a link mechanism 16. Also, when the slider 32 is slid and the drive rod 20 is pushed into the flexible tube 11, the operation wire 18
The cup-shaped electrode 14 opens via the link mechanism 16, and when the drive rod 20 is pulled out from inside the flexible tube 11, the cup-shaped electrode closes. Therefore, it is possible to perform a so-called hot biopsy, in which a high-frequency current is passed through the cup-shaped electrode 14 to collect biopsy tissue while cauterizing it. FIG. 1 shows the proximal end portion of the insertion section 10 removed from the operating section 30. Reference numeral 21 denotes a connecting cap fixed to the base end of the coil pipe 12 by, for example, soldering, in order to connect to the operating section main body 31. Reference numerals 22 and 23 are anti-bending tubes that are double-sheathed to protect the flexible tube l1 from being damaged by sudden bending at the proximal end.

As shown in FIG. 1, the distal end portion of the drive rod 20 is located within the connecting cap 2l, and when pushed into the insertion portion lO, collides with the proximal end surface l2a of the coil pipe 12. That is, the outer diameter of the drive rod 20 is larger than the inner diameter of the coil pipe 12, and as shown in detail in FIG. The proximal end surface 12a is ground into a flat surface. In this way, the stopper when the drive rod 20 is pushed into the insertion part 10 is formed on the insertion part 10 side, and the operation stroke S is not affected by misalignment with the operation part 30 side. Note that the present invention is not limited to hot biopsy forceps, but can be applied to standard biopsy forceps, grasping forceps, and the like. Since a stopper is provided on the insertion tube side, the maximum pushing amount of the operating wire can be maintained at the optimum state at all times without being affected by misalignment of the connection between the operating section and the insertion section. Excellent durability with no bending can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the proximal end portion of the insertion portion according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the stopper portion thereof, Fig. 3 is an overall side view of the embodiment, and Fig. 4 is the same. FIG. 5 is a partially cutaway side view of the distal end of the insertion portion of the embodiment, FIG. 5 is a partially cutaway side view of the operating portion of the embodiment, and FIG. 6 is a partially cutaway side view of the conventional example. [Effect of the invention]
DESCRIPTION OF SYMBOLS 10... Insertion part, 1l... Flexible tube, 12... Coil bar According to the endoscopic forceps of the present invention, the drive rod is inserted.
Eve. 13... Outer skin, l4... Cup-shaped electrode. 1
8... Operation wire that regulates the maximum pushing amount when pushed into the section, 2o... Drive rod, 21... Connecting cap, 30... Operating section, 1... Operating section main body, 32... sura

Claims (1)

[Scope of Claims] An opening/closing piece provided at the distal end of an insertion section formed by a flexible tube so as to be openable and closable; an operating wire inserted over substantially the entire length into the insertion section; and a proximal end side of the insertion section. a drive rod that protrudes from the mouth and drives the opening/closing piece to be opened and closed via the operation wire by advancing and retreating in the axial direction; and an operation section that is detachably attached to the proximal end side of the insertion section. , an endoscopic forceps having a slider detachably connected to the drive rod and slidably provided on the operation section to operate the drive rod forward and backward, the maximum pushing of the drive rod into the insertion section; Endoscopic forceps, characterized in that the insertion portion is provided with a stopper for regulating the amount.