JPS63257538A - Grasping apparatus - 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 [Another field of industry] The present invention relates to an improvement in a gripping device that can reliably grip soft intrabody cavity tissues such as fallopian tubes without damaging them.

[Problems to be solved by conventional techniques and inventions] In recent years,
Endoscopes are widely used to allow observation of organs within the body cavity by inserting an elongated insertion section into the body cavity, and to perform various therapeutic procedures as necessary using a treatment instrument inserted into the treatment instrument channel. It became so.

The endoscopes include flexible endoscopes that have a flexible insertion section and are inserted from the oral cavity, etc., and flexible endoscopes that have a hard insertion section that are guided by a trocar or the like and are inserted from the body surface toward the observation target site in the body cavity. There is also a rigid endoscope.

By the way, the hard abdominal cavity V is mainly used for abdominal vA detection.
Insert one abdominal cavity into the body cavity through a trocar, and while observing the inside of the body cavity endoscopically, perform treatment using each scale treatment instrument inserted into the body cavity through other trocars. It is widely practiced. Recently, one of these treatments is belly V! Gamete intrafallopian transplantation is becoming widely performed under mirror observation. This involves mixing sperm and eggs outside the body and then injecting them through the fallopian tubes under laparoscopic observation.

In order to inject eggs and sperm into the fallopian tubes, a 1m+n culm thick tube is inserted into the fallopian tubes, but at this time it is necessary to grasp and manipulate the fallopian tubes.

When grasping the fallopian tube, etc. in this way, conventionally, the fallopian tube, etc. is pinched using grasping forceps having an elastic member attached to the tip gripping part, as shown in, for example, Japanese Utility Model Application Publication No. 52-52388. , in Japanese Patent Application Laid-open No. 53-94881,
A processing tool is disclosed in which a gripping portion is provided with a wire loop, and the size of the loop can be changed.

In addition, there is a device in which a loop-shaped band member is provided at the distal end and the size of the loop is changed so that the fallopian tube can be grasped.

In particular, when a loop is formed using a band-like member, the shape of the loop may deform during use, making it unusable.

By the way, in recent years, 2-30C, which is called shape memory alloy,
Metal materials have been widely used in various products because they have the property of returning to the shape before processing, as if they had remembered the shape before being deformed when heated to a degree of 1.5 °C.

This is a phenomenon called the shape memory effect, and after the austenite phase, which has a certain shape and is stable at high temperatures, is cooled and transformed into the martensite phase, which is stable at low temperatures, an external force is applied. Even if it is deformed, it returns to its original shape when it is heated again and reversely transformed to the austenite phase.

Shape memory alloys currently in practical use are Ti-N
i-based and Cu-Zn-Aρ based alloys, etc., and are used in industrial products such as temperature sensors and actuators, and medical products such as joining members for fractured parts and orthodontic threads. , is gradually expanding.

It is also known that a similar phenomenon occurs in polymeric materials, and polymeric materials that exhibit this phenomenon are particularly called shape memory polymers.

There are various types of polymeric materials with tnR ability, but polyvinyl chloride, polymethyl methacrylate, polycarbonate, AB resins, etc. in particular exhibit a remarkable change in viscosity called glass transition extinction (hereinafter referred to as TO). It is known that when a material is deformed by an external force at a temperature below the TO temperature, it returns to its original shape when heated to a temperature above the TO temperature.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gripping device that can easily recover the shape of the loop even if the shape of the loop forming the gripping portion is deformed. The purpose is

[Means and effects for solving the problems] The gripping device according to the present invention has at least a part of the loop-shaped gripping portion made of a thermally deformable member, and even when the shape of the loop is deformed by an external force, the gripping device according to the present invention can be heated. 7, the shape of the loop can be restored.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

1 and 2 relate to a first embodiment of the present invention, in which FIG. 1 is a cross-sectional view of the gripping device, and FIG. 2 is an explanatory diagram of the state of use.

In the gripping device 1 of this embodiment, at the rear end of the elongated sheath 2,
A connecting member 3 having a hollow portion that communicates with the hollow portion of the sheath 2 is connected thereto. At the rear end of this connecting member 3,
Four tapered portions 4 are formed, and a convex portion 6 that fits into the concave portion 4 is removably connected to an operating portion main body 7 serving as an operating portion that extends toward the distal end. Two elongated holes 8.9 communicating with the hollow portion of the sheath 2 are formed in the operating portion main body 7 so that the length directions thereof are substantially parallel to each other in the 'Tqb direction.

Further, a band-shaped member 11 is inserted into the sheath 2. This strip member 11 has both end portions 12 and 13 inserted through the elongated holes 8 and 9 and led out from the rear end of the operating section main body 7, and an intermediate portion is inserted into the sheath 2 and is inserted into the sheath 2. It protrudes from the tip of 2 to form a loop-shaped grip part 14. This band-shaped member 11 is a heat-deformable member made of a shape-memory polymer such as polyvinyl chloride, polymethyl methacrylate, polycarbonate, and AS resin.

In addition, on the side of one Q hole 8 side of the operation section main body 7,
A screw hole 16 is provided from the outer periphery of the operation section main body 7 to the hole 8, and a fixing screw 17 is screwed into the screw hole 16.
The belt-like member 11 inserted into the elongated hole 8 can be fixed by pressing the one end 12 side thereof. - Also, on the side of the other long hole 9 side of the operation section main body 7,
A notch 18 is formed that reaches this elongated hole 9, and a bottle 19 allows the operation part main body 7 to be rotatably inserted into the notch 18.
A lever 21 supported by the lever 21 is disposed. One end of this lever 21 protrudes from the side surface of the operating section main body 7,
The finger rest forms part 22. And this finger rest is part 2
2 toward your hand and rotate the lever 21 counterclockwise, the presser part 23 of the lever 21 on the opposite side of the bottle 19 will press the strip member 11 inserted into the elongated hole 9.
It can be fixed by pressing the other end 13 side.

Then, with the one end 12 side of the strip member 11 fixed by the fixing screw 17, the other end 13 of the strip member 11 is fixed.
By moving the side in the axial direction, the size of the loop of the gripping part 14 protruding from the distal end of the sheath 2 can be changed. Furthermore, by fixing the other end 13 side of the strip member 14 with the lever 21, the size of the loop of the gripping portion 14 can be maintained at an arbitrary size.

Further, a bottle 20 is installed in the radial direction on the distal end side of the hollow portion of the sheath 2, and the band member 11 is connected to the bottle 20.
When the other end 13 of this band-like member 11 is pulled, this band-like member 11 is prevented from being drawn into the sheath 2 by a predetermined amount or more.

Next, the operation of the embodiment with the above configuration will be explained with reference to FIG. 2.

In FIG. 2, reference numeral 26 indicates the fallopian tube, and reference numeral 27 indicates the fallopian tube.

For example, in gamete intrafallopian transplantation under laparoscopic observation (to inject sperm and eggs into the fallopian tube),
When grasping and lifting the fallopian tube in order to insert the fallopian tube into the fallopian tube from the fallopian tube clasp, the fallopian tube holder 1 is inserted through a trocar etc. (not shown) with the loop of the gripping part 14 made sufficiently small. Insert into body cavity. Next, fixing screw 17
While one end 12 side of the strip member 11 is fixed, the other end 13 side of the strip member 11 is moved in the axial direction,
The size of the loop of the gripping part 14 is set to an appropriate size. Next, under observation using a laparoscope (not shown), the fallopian tube 26 is inserted into the loop of the gripping portion 14 from the fallopian tube clasp 27 side. Then, the other end 13 side of the strip member 11 is pulled to make the loop of the gripping part 14 smaller, and the fallopian tube 26 is gripped by the gripping part 14. Furthermore, by pulling the finger hook of the lever 21, the other end 1 of the band-like member 11 can be adjusted.
3 side is fixed and the oviduct 26 is lifted while keeping the size of the loop of the gripping part 147 constant.

By the way, if the loop shape is deformed by external force by repeatedly performing the above operations, the loop shape can be restored by the following method. In other words, the shape memory polymer forming the strip member 11 is formed into a loop shape at a temperature of 1 g or higher, and even if the shape of the loop is deformed, the shape memory polymer can be heated to a temperature higher than TO to create a loop. The shape is now restored.

According to this embodiment, the belt-shaped member 11 forming the grip part 14
The loop shape of can be easily recovered.

FIG. 3 is a sectional view of a gripping portion according to a second embodiment of the present invention.

In this embodiment, the strip member 28 forming the grip portion 14 is
The thermally deformable member is formed of a loop-shaped member made of a shape memory alloy such as T1-Jli type or Cu-Zn-Al1 type.

The band-shaped member 28 is covered with an elastic covering material 29 such as resin such as Teflon (trade name) or rubber, so as to reduce the risk of piles of tissue in the body cavity such as the fallopian tube. ing.

The band-shaped member 28 constituting the gripping part 14 has a loop-like shape memorized at a temperature above the martensitic transformation point, and even on a platform where the loop shape is deformed by external force, it can be heated to above the martensitic transformation point. I decided to try it,
It is now possible to recover the loop shape again.

The other configurations are the same as in the first embodiment.

FIG. 4 is a sectional view of a gripping portion according to a third embodiment of the present invention.

In this embodiment, the strip member 31 forming the grip portion 14 is
For example, the band-shaped member 31 is made of elastic metal or the like.
are thermally deformable members such as polyvinyl chloride and polymethyl methacrylate.

The cover material 32 is coated with a shape memory polymer such as polycarbonate or ΔB resin.

The configuration of the square is similar to that of the first embodiment.

FIG. 5 is a sectional view of a gripping device according to a fourth embodiment of the present invention.

In this embodiment, the rear end of the sheath 2 has a hollow portion that communicates with the hollow portion of the sheath 2, and the two finger hooks are connected to the portion 36.
An operating section main body 37 having a shape formed thereon is connected thereto. A shaft portion 38 of a slide operation member 41 having three finger hooks on the rear end side of the shaft portion 38 is slidably inserted into the hollow portion of the operation portion main body 37. A rod-shaped connecting member 42 is connected to the tip of the shaft portion 38 of this slide operation member 41, and a cylindrical moving member 43 is connected to the tip of this connecting member 23. This moving member 43 is configured to move in the axial direction within the sheath 2 by sliding the slide operating member 41 in the axial direction. Roughly speaking, on the distal end side of the moving member 43, both ends of a band-like member 44 that protrudes from the distal end of the sheath 2 and forms the loop-shaped grip portion 14 are omitted. Further, a key groove 46 is formed in the axial direction on one side of the shaft portion 38 of the slide operation member 41,
The tip of a fixing screw 47 that penetrates into the hollow portion from the outer periphery of the operating section main body 37 on the keyway 46 side is fitted into the keyway 46 . By tightening this fixing screw 47, the slide operating member 41 can be fixed in any position.

The band member 44 is a thermally deformable member made of a shape memory polymer such as polyvinyl chloride, polymethyl methacrylate, polycarbonate, and A[3 resin.

In this embodiment, the fixing screw 47 is loosened, and the operation part main body 37 is
On the other hand, by moving the slide operating member 41 in the axial direction, the size of the loop of the grip portion 14 can be set to an arbitrary size, and by tightening the fixing screw 47, the slide operating member 41 can be fixed. Thus, the size of the loop of the gripping portion 14 can be maintained constant.

In addition, in this embodiment, by loosening the fixing screw 47 and completely removing it from the keyway 46, all the members inserted into the sheath 2 can be removed from the inside of the sheath 2, and the inside of the sheath 2 can be cleaned, etc. becomes easier.

In addition, instead of the keyway 46 and the fixing screw 47, a ratchet l
- The slide operation member 41 may be fixed at any position.

Alternatively, the band member 44 may be formed of an elastic metal and covered with a shape memory polymer, or may be formed of a shape memory alloy and covered with an elastic coating material such as Teflon (trade name) or rubber. Good too.

With this configuration, even if the grip portion 14 is deformed, it can easily recover its shape.

[Effects of the Invention] As explained above, according to the present invention, even if the shape of the loop is deformed by configuring at least a portion of the gripping portion with a thermally deformable member, the shape of the loop can be easily recovered. There is.

[Brief explanation of the drawing]

1 and 2 relate to the first embodiment of the present invention, in which FIG. 1 is a sectional view of the gripping device, FIG. 2 is an explanatory diagram of the usage state, and FIG.
The figure is a sectional view of a gripping part according to a second embodiment of the invention, FIG. 4 is a sectional view of a gripping part according to a third embodiment of the invention, and FIG. 5 is a sectional view of a gripping device according to a fourth embodiment of the invention. It is a diagram. 1... Gripping device 11... Band-shaped member 14...
・Gripping part 7...Gripping part

Claims (3)

[Claims] (1) A gripping device having a loop-shaped gripping portion, characterized in that the gripping portion is constructed of a thermally deformable member that can recover its shape by applying heat even if at least a portion of the gripping portion is deformed by an external force. . (2) The gripping device according to claim 1, wherein the thermally deformable member is a shape memory alloy. (3) The gripping device according to claim 1, wherein the thermally deformable member is a shape memory polymer.