JPS62144643A - Forcept for endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to endoscope forceps that are used by being inserted into a forceps channel of an endoscope. The present invention relates to an improvement of endoscopic forceps in which the forceps have improved passage through the forceps channel.

[Prior Art] Generally, an endoscope a is bent with a small radius of curvature at a curved portion, as shown in FIG. On the other hand, the tip actuating part d of the endoscope forceps C is a rigid part that cannot be bent, and if the tip part of the coil e connected to it is stiff, the bending part is already slightly bent in the forceps channel f. 211 for endoscope
Child C becomes taut, making it difficult to pass through forceps channel f.

Therefore, as shown in Fig. 4, by connecting the coil h wound with a thin wire to the tip side of the coil g wound with a thick wire, the stiffness of the tip side is weakened and the coil g is wound with a thick wire. There was one that improved the passability. j is an operating wire inserted into the coil.

However, when coils g and h are connected in this way, a seam i whose hardness changes drastically is created at the connected part, and the
! There is a drawback that the eye I is easily damaged, so a method was devised in which the stiffness of one coil was changed and the stiffness of the coil was weakened only at the tip to eliminate this drawback.

Conventionally, the stiffness of only the tip of a single coil has been weakened, for example, by leaving a gap in the coil only at the tip and winding it roughly (Japanese Utility Model Publication No. 52-22148), or by quenching, tempering, etc. The stiffness of the coil is changed by partially subjecting the coil to heat treatment or chemical treatment such as carburizing or nitriding (Japanese Patent Laid-Open No. 58-8
029 Publication), etc.

[Problems to be solved by the invention] In the above-mentioned coil that is roughly wound with a gap in the coil only at the tip, when the operating wire inserted into the coil is pulled, the coil contracts and generates sufficient operating force. However, coils that are partially hardened by heat treatment or chemical treatment have the disadvantage that the basic functions for cutting out living tissue and grasping foreign objects cannot be fully demonstrated.
If the wire is hardened before being formed into a coil, the work of winding the coil becomes extremely difficult, and if it is hardened after being formed into a coil, there are drawbacks such as uneven hardening and irregular dimensions of the coil.

The purpose of this invention is to eliminate such conventional drawbacks and provide endoscopic forceps that have good passageability within a forceps channel and are excellent in all aspects such as operating force, durability, and ease of manufacture. shall be.

[Means for Solving the Problems] The endoscopic forceps of the present invention for achieving the above object will be described based on FIG. 1 corresponding to an embodiment. A close-wound coil 3 connects the hand operation section l and the tip operation section 2, and the close-wound coil 3 is formed with adhesion force applied in the tube axis direction, and is in close contact at its distal end. It is characterized in that a flexible portion 3a with a weak stiffness is formed by reducing the force.

[Function] Since the flexible portion 3a is formed at the tip of the tightly wound coil 3 and the stiffness of that portion is weakened, when the endoscope forceps according to the present invention is inserted into the forceps channel of the endoscope, a small Even in a forceps channel bent with a radius of curvature, the tightly wound coil 3 passes smoothly without being strained.

[Example] An example in which the present invention is applied to endoscopic forceps for collecting biopsy tissue will be described based on FIGS. 1 and 2.

Fig. 1 shows an unimplemented endoscope forceps, and shows the hand operation part 1.
consists of an operation part body 11 and an operation piece 12 slidably provided thereon, and the tip operation part 2 includes a support body 21 and a pair of hemispherical cup-shaped collectors 22 pivotally supported at the tip thereof so as to be freely openable and closable. , consisting of a known link mechanism 23 connected to the rear end of the extractor 22.

Then, a strand made of one thin metal wire (for example, a wire with a diameter of 0.
Both ends of a tightly wound coil 3 made of tightly wound stainless steel wire (5 mm stainless steel wire) are fixed to the operating section main body 11 and the support body 21 by soldering or the like.
The hand operation section 1 and the distal end operation section 2 are connected by.

Further, an operating wire 4 is inserted into the tightly wound coil 3 so as to be freely advanced and retracted, and both ends of the operating wire 4 are connected to the operating piece 12.
and a link mechanism 23, respectively, by soldering or silver brazing, and by sliding the operation piece 12, the operation wire 4 moves forward and backward, and the collector 22 is opened and closed via the link mechanism 23 at the tip. Collect the biopsy tissue using device 2.
It can be collected within 2 days.

The close-wound coil 3 is formed with adhesion force applied in the tube axis direction so that a force in the adhesion direction is constantly applied over its entire length.
To explain based on the figure, the two-dot chain line is the direction in which the strand is wound up, and a tension T is applied to the strand at the winding part A from a diagonal direction by an angle θ shown in FIG. is supplied, and the winding section A is rotated to wind and form the wire into a coil shape. As a result, a tightly wound coil with adhesion force applied in the tube axis direction is manufactured. By appropriately selecting the winding angle θ and the magnitude of the tension T, the applied adhesion force can be set to an arbitrary magnitude.

A flexible portion 3a is formed at the tip of the densely wound coil 3, which has a weak adhesion force and therefore has a weak stiffness. In order to reduce the adhesion force of the coil only at the tip, it is sufficient to change the winding angle θ or the magnitude of the tension T as described in ``2'' during the manufacturing process of the close-wound coil 3. After manufacturing the coil, the adhesion force may be reduced by pulling only the tip portion of the coil with an appropriate force in a direction that separates the coil from adhesion.

Note that if the length of the flexible portion 3a is too long, the operating wire 4
When pulled, the tightly wound coil 3 may bend at the flexible portion 3a and shake, causing the tip actuating portion 2 to deviate from the target area. Therefore, the length of the flexible portion 3a is preferably the minimum length that can pass through the child channel bent with a relatively small radius of curvature, and is generally about 3 to 10 times the outer diameter of the closely wound coil 3. It is appropriate to make the length about 5 times longer, and in many cases, it is excellent in both passing ability and targeting ability. Therefore, in the above embodiment, the length of the flexible portion 3a is approximately five times (
5D), the endoscope head according to this embodiment smoothly passes through the child channel bent with a small radius of curvature, and when the tip actuating section 2 is opposed to the target site and the operating wire 4 is pulled. The sampler 22 opens and closes without the flexible portion 3a of the tightly wound coil 3 shaking its head, allowing the biopsy tissue to be sampled accurately.

In the above embodiments, forceps for collecting biopsy tissue were shown as endoscope forceps, but the present invention is not limited to this, and gripping forceps for collecting foreign bodies or other devices may also be used. . Further, the adhesion force of the flexible portion 3a may be uniformly reduced over its entire length, or the adhesion force may be changed so as to gradually become smaller toward the distal end side. Furthermore, the adhesion force may be zero in the portion where the adhesion force is small.

[Effects of the Invention] According to the endoscopic forceps of the present invention, a weak flexible portion is formed at the tip of the tightly wound coil, so that the forceps can smoothly pass through the forceps channel bent with a small radius of curvature. In addition, there are no seams or gaps in the tightly wound coil, so it has excellent durability and sniping ability.Moreover, the flexible part is formed by changing the adhesion of the tightly wound coil.
It has advantages such as easy and accurate manufacturing and low cost.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a schematic diagram showing an example of the manufacturing process of a tightly wound coil according to the embodiment, and Fig. 3 is a state in which conventional endoscopic forceps are used. FIG. 4 is a plan view of another conventional endoscope forceps. l...Hand control unit, 2...Tip operating unit, 3...Tightly wound coil, 3a...Flexibility attorney Patent attorney Kazuhiko Mitsui; Figure 2

Claims (1)

[Claims] An endoscopic forceps in which a hand operating section and a distal operating section are connected by a tightly wound coil made of thin metal wire tightly wound, wherein the tightly wound coil is arranged in the direction of its tube axis. A forceps for an endoscope, characterized in that the forceps are formed by applying an adhesion force to the forceps, and have a weak flexible part formed by reducing the adhesion force at the distal end portion.