JPS63255046A - Treatment jig 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] The present invention relates to an endoscopic treatment instrument that is introduced endoscopically into a body cavity to collect biological tissue, for example.

[Prior Art] There are various endoscopic treatment instruments, one of which is known as biopsy forceps. As is well known, biopsy forceps are provided with a distal end cup section, which is a treatment section, at the distal end of a flexible tube, and an operating section at the proximal end. Further, an operating wire serving as an operating member is inserted through the flexible tube. One end of this operating wire is connected to the tip cup portion, and the other end is connected to the operating portion. Therefore, by operating the operating section and pushing and pulling the operating wire, the tip cup section can be opened and closed.

An example of the prior art showing such a biopsy forceps is Japanese Utility Model Publication No. 52-40616.

[Problems to be Solved by the Invention] Incidentally, the biopsy forceps introduced into the living body through the channel of the endoscope not only have a fairly long overall length, but also are inevitably bent. Therefore, even if you operate the operation part provided at the proximal end of the flexible tube to open and close the distal cup part of such biopsy forceps, it will be long and
Moreover, the operating wire, which has increased frictional resistance with the flexible tube due to being bent, may for example buckle, making it difficult to reliably transmit the operating force of the operating section to its tip. Therefore, it has been impossible to move the tip cup portion reliably to the container.

This invention was made based on the above circumstances, and its purpose is to provide an endoscope that is provided at the tip of a flexible tube and that allows the treatment section to be operated reliably and easily. The aim is to provide medical treatment tools.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides a flexible tube, a treatment section provided at the distal end of the flexible tube, and a treatment section inserted into the flexible tube. an operating member whose distal end is connected to the treatment section and whose proximal end is fixed to the flexible tube, and at least one of the flexible tube or the operating member is shaped to expand or contract when heated. Made from shape memory alloy. Then, the treatment section is operated by the shape memory effect of the shape memory alloy.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a biopsy forceps 1 as an endoscopic treatment instrument, and this biopsy forceps 1 is equipped with a flexible tube 2. FIG. The flexible tube 2 is composed of a tightly wound coil in which a first coil 3 and a second coil 4 made of a shape memory alloy are wound multiple times. The first coil 3 and the second coil 4 are coated with an insulating coating so that they are electrically insulated from each other.

A distal end member 5 is attached to the distal end of the flexible tube 2 formed in this way, and a rear end member 6 is attached to the proximal end. An operating member 7 is attached to this rear end member 6. One end of a first lead wire 8 is connected to the base end of the first coil 3, and one end of a second lead wire 9 is connected to the base end of the second coil 4. The other end of the first lead wire 5 is connected to the energizing circuit 12 via a switch 11 provided on the operating member 7, and the second lead wire 9
The other end is also connected to the energizing circuit 12. Further, the tips of the first coil 3 and the second coil 4 are electrically connected via the tip member 5. Therefore, when the switch 11 is turned on, the first coil 3 and the second coil 4 can be electrically heated.

Before being heated by electricity, the first and second coils 3.4 are in a tightly wound state where adjacent spirals are in close contact with each other, as shown in Figure 2, at room temperature. When this is done, shape memory processing is performed so that the adjacent spirals are deformed into a loosely wound state with a predetermined spacing between them as shown in FIG.

The distal end member 5 is formed with a through hole 13 and a slit 14 that communicates with the through hole 13 and is open to the distal end side of the distal end member 5. A mounting hole 15 is formed in the rear end member 6. An operating wire 16 as an operating member is inserted into the flexible tube 2. The proximal end of the operating wire 16 is fixed to the mounting hole 15 of the rear end member 6, and the distal end is attached to the distal end member 5. A joint 17 protruding from the through hole 13 into the slit 14 is attached. One end of a pair of links 18 is pivotally attached to the distal end of the joint 17 located in the slit 14 by a first pin 19 . One end of a pair of cup forceps 21 is pivotally connected to the other ends of these links 18 by second pins 22, respectively. A midway portion of these cup forceps 21 is pivotally attached to the tip member 5 by a third pin 23. Therefore, when the joint 17 moves forward from the state shown in FIG. 1 as shown in FIG. 2, the pair of cup forceps 21 rotate in the opening direction about the third pin 23 as a fulcrum.

Next, a case in which the biopsy forceps 1 described above is used will be explained. First, the switch 11 provided on the operating member 7 is closed and the first and second coils 3.4 are heated at a temperature lower than the transformation temperature. The coils 2.3 are then deformed in such a way that adjacent helices are spaced apart by a smaller spacing than shown in FIG. Therefore, the joint 17 provided at the tip of the operating wire 16 protrudes slightly from the through hole 13 of the tip member 5 compared to the state shown in FIG. 1, and the pair of cup forceps 21 is held in a lightly closed state. In this state, the biopsy forceps 1 are introduced into the body cavity through a channel of an endoscope (not shown). After the tip of the biopsy forceps 1 has been made to protrude from the channel into the body cavity, the switch 11 is turned off. Then, since the first and second coils 3.4 return to room temperature, these coils 3.4 are transformed into a tightly wound state as shown in FIG. 2, and the pair of cup forceps 21 are thereby opened. become.

When the inside of the body cavity is observed using an endoscope and a location where biological tissue is to be collected, such as a diseased part, is found, a pair of released cup forceps 21 is pressed against that part. In this state, the first and second coils 3.4 are energized to heat them above their transformation temperature. Then, since these coils 3.4 are expanded as shown in FIG. 1, the pair of cup forceps 21 are tightly closed. Therefore, living tissue can be collected using the pair of cup forceps 21.

That is, according to the biopsy forceps 1, the shape memory effect of the first and second coils 2.3 allows the pair of cup forceps 21 to
can be opened and closed.

Note that the present invention is not limited to the above embodiment; for example, instead of the flexible tube, the operating wire may be made of a shape memory alloy and processed with shape memory so that it shrinks when heated and closes the pair of cup forceps. .

Alternatively, both the flexible tube and the operating wire may be made of a shape memory alloy, and when one of them is heated, the pair of cup forceps closes, and when the other is heated, the pair of cup forceps is opened. One of them may be made of a bidirectional shape memory alloy so that the pair of cup forceps can be operated between an open state and a closed state.

Furthermore, the flexible tube may be made of a single coil instead of a multi-wound fill.

Furthermore, the endoscopic treatment instrument according to the present invention is not limited to biopsy forceps, but may also be basket forceps, three-pronged forceps, high-frequency snares, etc. In short, the instrument is actuated at the tip of a flexible tube. Any device can be applied as long as it is provided with a necessary treatment section.

Further, the heating means according to the present invention may be heated by flowing hot water through a channel of the endoscope instead of applying electricity.

[Effects of the Invention] As described above, in the present invention, at least one of the treatment parts at the distal end is made of a shape memory alloy, and shape memory processing is performed so that the treatment part is expanded or contracted by being heated. Therefore, by heating the shape memory alloy, the treatment section can be operated reliably, so that the operation is not uncertain as in the past, where the treatment section was operated by pushing and pulling the operation wire. can be prevented.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view of a coil forming a flexible tube in a state where it is heated with electricity, and Fig. 2 is a sectional view of a coil forming a flexible tube in a state where it is not heated with electricity. FIG. 2... Flexible tube, 3... First coil, 4... Second
coil, 16... operating wire, 21... cup forceps.

Claims (1)

[Claims] a flexible tube; a treatment section provided at the distal end of the flexible tube;
an operating member that is inserted into the flexible tube, has a distal end connected to the treatment section, and a proximal end fixed to the flexible tube, and at least one of the flexible tube or the operating member is heated. An endoscopic treatment tool characterized in that it is made of a shape memory alloy processed to expand or contract.