JPH0737604Y2 - Endoscopic forceps device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is mainly used by being inserted into a forceps channel of an endoscope, and is used for collecting biopsy tissue in a body cavity and grasping and collecting foreign matter. The present invention relates to a forceps device for an endoscope.

[Conventional technology]

FIG. 3 shows a conventional endoscopic biopsy forceps device. Reference numeral 51 denotes a support cylinder in which a slot 52 opening to the distal end side and a through hole 53 orthogonal to the slot are formed. The support tube 51 is inserted into the through hole 53 so as to cross the slot 52.
Shaft fixed by being caulked from the outside. Reference numeral 55 denotes a link portion 55a and a forceps cup portion integrally formed with the link portion 55a.
55b is a pair of driven bodies, and a shaft body 54 is inserted into a shaft hole 55c formed in each link portion 55a, and the driven body 55 rotates about the shaft body 54.

With such a configuration, the link mechanism in the slot 52 can be operated by advancing and retracting an operation wire (not shown).
The driven body 55 rotates about the shaft body 54 via 56, and the forceps cup portion 55b is opened and closed.

[Problems to be solved by the device]

As described above, the shaft body 54 is fixed to the support cylinder 51 by caulking from the outside. It is not impossible to use caulking instead of caulking, but caulking is most often used because caulking is the best when comprehensively evaluated for workability, fixing strength, and operation. There is.

However, there is also a drawback in fixing the shaft 54 by caulking. The caulking is performed from the direction shown by the arrow A in FIG. 3 with the driven body 55 attached, but if the caulking is too strong, the supporting cylinder 51 will be retroactively deformed and the width of the slot 52 will be narrowed. A large resistance is applied to the link portion 55a of the driven body 55 from the side surface, and the driven body 55 does not operate smoothly.

Therefore, not only a certain level of skill is required for the caulking work of this portion, but also the fixing strength and the working condition vary depending on the operator.

An object of the present invention is to provide a forceps device for an endoscope which eliminates such conventional drawbacks, can more easily perform a caulking work of a shaft, and does not cause a malfunction due to excessive caulking. And

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the forceps device for an endoscope of the present invention is configured to traverse the slot and a support tube having a slot opening to the distal end side and a hole orthogonal to the slot. A shaft body inserted into the hole and fixed to the support cylinder by being caulked from the outside, a link portion rotatably supported by the shaft body in the slot, and the link portion are integrally formed. In the forceps device for an endoscope provided with a driven body including an opening / closing operation unit that is opened / closed by rotating the link unit, the same length as the width of the slot is not compressed by the caulking. A cylindrical body is fitted in the shaft body in the slot, and a shaft hole formed in a link portion of the driven body is rotatably fitted in the cylindrical body.

[Action]

The width of the slot is prevented from being narrowed by the tubular body fitted to the shaft body in the slot. Therefore, even if the shaft body is strongly caulked from the outside, the slit is not deformed and the width is not narrowed, and the driven body can rotate without being pressed.

Further, since the cylindrical body is provided at the center of rotation of the driven body, it does not interfere with the operation of the driven body when it rotates.

〔Example〕

An embodiment will be described with reference to the drawings. Although this embodiment applies the present invention to an endoscopic biopsy forceps device, it can be applied to a grasping forceps device for collecting foreign matter and other endoscopic forceps devices.

FIG. 1 is a plan view showing a part of the forceps device for an endoscope by cutting it out, and FIG. 2 is a side view thereof.

In the figure, reference numeral 1 is a support cylinder in which a slot 2 that is open to the tip side and a hole 3 that is orthogonal to the slot 2 are formed. The hole 3 is formed by penetrating the support cylinder 1, and a counterbore is formed at one of the mouths 3a thereof, and the other mouth 3b is chamfered. Further, a tip portion of a flexible close-wound coil 4 is fixedly connected near the rear end portion of the support cylinder 1.

Reference numeral 5 denotes a shaft body that is inserted into the hole 3 so as to traverse the slot 2, and one end side thereof is formed thick enough to be fitted into a counterbore portion of one mouth 3a of the shaft body 5. . On the outer periphery of the shaft body 5, a tubular body 6 having the same length as the width of the slot 2 is fitted. A shaft hole 3c penetratingly formed in each link portion 7a of a pair of driven bodies 7 to be described later is rotatably fitted to the outer periphery of the cylindrical body 6, and the shaft body 5 is in this state, a dish. The chamfered hole 3 is caulked from the mouth 3b side, and its end is expanded and fixed to the support cylinder 1.

Here, since the outer diameter of the tubular body 6 fitted to the shaft body 5 is larger than the diameter of the hole 3 formed in the support barrel 1, the tubular body 6 cannot be inserted into the hole 3. Therefore, even if a force is applied in the direction of compressing the width of the slot 2, the tubular body 6 prevents the slot 2 from being deformed, and the width of the slot 2 is maintained at the original predetermined size. Therefore, even if the caulking work is strongly performed, the driven body 7 is not pressed, so that the defective operation does not occur, and the caulking work can be performed firmly without any trouble.

Regarding the other parts, the forceps device for an endoscope of this embodiment is not different from the conventional one. That is, the driven body 7
Is composed of the above-mentioned link portion 7a pivotally supported by the shaft body 5 in the slot 2 and a forceps cup portion (opening / closing operation portion) 7b integrally formed with the link portion 7a. By rotating the link portion 7a about the shaft body 5, the forceps cup portion 7b is opened and closed. The two-dot chain line in FIG. 2 indicates that the forceps cup portion 7b is open.

A link plate 8 is rotatably connected by a pin 9 near the rear end of the link portion 7a of each driven body 7, and the rear end portions of both link plates 8 are connected to a single operating rod 10. It is rotatably connected by a pin 11. Further, a distal end portion of a flexible operation wire (not shown) inserted in the coil 4 so as to be able to move back and forth is fixed to the rear end portion of the operating rod 10.

Therefore, if the operation wire is operated to move back and forth remotely, the actuating rod 10 slides in the axial direction, the driven body 7 rotates about the shaft body 5 and the cylinder body 6 via the link plate 8, and the forceps. Cup part 7b
Is opened and closed. Since the tubular body 6 is provided at the rotation center position of the driven body 7, the presence of the tubular body 6 does not hinder the rotational movement of the driven body 7.

[Effect of the Invention] According to the forceps device for an endoscope of the present invention, even if a force to narrow the slit is applied, the width of the slit is kept constant by the tubular body, so that the swaging is performed strongly. However, the driven body operates smoothly without causing malfunction. Therefore, anyone can firmly and strongly perform the crimping work, which has an excellent effect that smooth operability and stable crimping strength can be obtained without variation among products.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of an embodiment of the present invention by cutting out, FIG. 2 is a side view thereof, and FIG. 3 is a plan view showing a part of a conventional example by cutting out. 1 ... Support tube, 2 ... Slot, 3 ... Hole, 5 ... Shaft, 6 ... Cylindrical body, 7 ... Driven body, 7a ... Link part, 7b
...... Forceps cup section (opening and closing operation section).

Claims (1)

[Scope of utility model registration request] 1. A support cylinder having a slot opening to the front end side and a hole perpendicular to the slot, and a support tube inserted into the hole so as to traverse the slot from the outside of the support tube. A shaft body that is crimped and fixed, a link portion that is rotatably supported by the shaft body in the slot, and a link portion that is integrally formed with the link portion and that is opened and closed by rotating the link portion. In a forceps device for an endoscope provided with a driven body consisting of an opening / closing operation part, a tubular body having the same length as the width of the slot and not compressed by the caulking is fitted to the shaft body in the slot. do it,
A forceps device for an endoscope, characterized in that a shaft hole formed in a link portion of the driven body is rotatably fitted to the cylindrical body.