JPS63257535A - 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 improvements in sheaths for endoscopic treatment tools.

[Problems to be solved by conventional techniques and inventions] In recent years,
By inserting the insertion section of the 111 barb into the body cavity, it is possible to observe internal organs in the body cavity, and if necessary, perform various medical treatments using the treatment instrument inserted into the treatment instrument channel. Mirrors are widely used. Furthermore, in the industrial field, industrial endoscopes that can observe the inside of boilers, turbines, engines, chemical plants, etc. are widely used.

Treatment instruments as accessory parts of the medical endoscope include biopsy forceps, grasping forceps, and the like. This type of treatment tool is, for example,
For example, as disclosed in Japanese Utility Model Publication No. 61-26508, a sheath with a treatment section attached to the tip is constituted by a coil, and a twisted operating wire is inserted into the sheath to remove the operating wire. The treatment section is operated by the operation. Further, in Japanese Utility Model Application Publication No. 61-67709, a treatment section is provided at the tip of a flexible tube into which an operating wire is inserted, and this treatment section is attached to the tip of a bend-proof coil serving as a sheath for externally fitting the nJ flexible tube. A shield for use in mounting and manipulating the operating wire is disclosed.

However, since the above-mentioned sheath is made up of a tight-fitting coil with a small inner diameter, it is difficult for cleaning water to enter the inside during cleaning, and furthermore, if it gets bent, it is difficult to restore it to its original shape. .

By the way, in recent years, 2 to 30G, called shape memory alloy,
Metal materials that have the property of returning to their original shape when heated to a certain degree, as if they had remembered their original shape, are often used in various products.

This is a phenomenon called the shape memory effect, and after the ausbunite phase, which has a certain shape and is stable at high temperatures, is cooled and transformed into the martensitic phase, which is stable at low temperatures, an external force is applied. Even if it is deformed, it can be heated again and Δ-
This is a phenomenon in which when reversely transformed to the Stenite 1-phase, it returns to its original shape.

Types of this shape memory effect include one-way shape memory and two-way shape memory.

Unidirectional shape memory only remembers the shape of the austenite phase, and when we talk about shape memory alloys, we usually mean unidirectional shape memory alloys.

Two-way shape memory remembers the shape when deformed in the martensitic phase as well as the shape in the austenite phase, and is also called the variable shape memory effect.

Shape memory alloys currently in practical use are Ti-N
I-based and Cu-Zn-AN 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.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a treatment for an endoscope that allows for easy cleaning of the inside of the sheath and also allows for repairing creases in the sheath. The purpose is to provide ingredients.

[Means and effects for solving the problems] In the endoscopic treatment instrument according to the present invention, at least a part of the coil forming the sheath is made of a thermally deformable member such as a shape memory alloy, and Depending on the change, it is possible to form an inlet for washing water into the sheath or to form a flow path and to correct any kinks that may have occurred in the sheath.

[Example] FIG. 1 and FIG. 2 relate to the first example, and FIG.
An explanatory diagram showing the overall configuration of endoscopic biopsy forceps, Fig. 2 (
a) is an explanatory diagram of the sheath in use, and FIG. 2(b) is an explanatory diagram of the sheath in use.
It is an explanatory view of the sheath at the time of cleaning.

In FIG. 1, a biopsy forceps 1 includes a sheath 2 and a treatment section 3 provided at the distal end of the sheath 2.

The operating section 4 is provided at the M end of the sheath 2. The sheath 2 is constituted by a close-wound coil 12 formed by closely winding a wire made of a two-way shape memory alloy such as a Ti-Ni alloy or a Cu-Zn-AfJ alloy. The treatment section 3 also has a pair of biopsy cups 5a, 5b, which are attached to a sleeve 7 connected to the tip 6g of the sheath 2.
The cup-shaped tip side can be opened and closed.

A tip of a twisted operating wire 8 is connected to a connecting portion (not shown) of the biopsy cups 5a, 5b. The operating wire 8 is inserted into the sheath 2 and led out to the operating section 4.

Further, in the operating section 4, an operating section main body 9 is connected to the rear end of the sheath 2. The operating section main body 9 includes a shaft section 11 and a finger ring 13 formed at the rear end of the shaft section 11. The shaft portion 11 includes:
A slider 14 is loosely fitted, and the rear end of the operating wire A78 is connected to the slider 14.

When the composition of the shape memory alloy constituting the closely wound coil 12 is in the austenite phase, it memorizes the coil shape with coarse coil spacing as shown in FIG. As shown in Figure (a), the coil 12 has a two-way shape memory characteristic that remembers the shape of the closely wound coil 12.

By the way, when cleaning the biopsy forceps 1, the sheath 2 changes from a tightly wound coil to a shape shown in FIG. ), the shape can be changed from a pre-memorized shape to a coil with coarse coil spacing.

In addition, when returning the biopsy forceps 1 to the shape in which it will be used, the shape memory alloy forming the sheath 2 can be stored in advance by lowering the temperature below the transformation point to the martensitic phase, as shown in Figure 2 (a>). The shape of the coil allows for tight winding of the coil.

By changing the QIU conditions in this way and making the coil spacing coarser, it is possible to form an inlet for the cleaning water into the sheath 2, making it possible to perform good cleaning. There is.

Furthermore, even when the tightly wound coil 12 is bent, it can recover its shape by lowering the temperature below the transformation point to the martensitic phase.

FIG. 3 relates to the second embodiment; FIG. 3(a) is a state diagram of the sheath in use, and FIG. 3(b) is a state diagram of the sheath during cleaning.

In FIG. 3, a tightly wound coil 12 constituting the sheath 2
is a two-way shape memory alloy, and when the composition is in the austenite phase, the tightly wound coil 1 as shown in Fig. 3(b)
In the martensitic phase, a state in which the inner diameter of the tightly wound coil 12 is reduced is stored as shown in FIG. 3(a).

Therefore, when cleaning the biopsy forceps 1, by raising the temperature R above the transformation point of the austenite phase, the inner diameter of the tightly wound coil 12 is expanded to form a flow path for cleaning water. Furthermore, by lowering the temperature below the transformation point of the martensitic phase, it is possible to recover the memorized shape of the martensitic phase.

Other functions and effects are similar to those of the first embodiment.

FIG. 4 relates to the third embodiment; FIG. 4(a) is an explanatory diagram of the sheath during cleaning, and FIG. 4(b) is an explanatory diagram of the sheath in use.

The tightly wound coil 17 constituting the sheath 2 is made of a unidirectional shape memory alloy. This unidirectional shape memory alloy remembers the shape of the tightly wound coil 17, which is the shape in the austenite phase state.

By the way, when cleaning the @-wound coil 17 as shown in Figure 4 (a)
), and by widening the spacing between the coils, an inlet for cleaning water can be formed.

When the shape is restored, the shape can be restored to a densely wound coil 17 as shown in FIG. 4(b) by heating the coil to a temperature above the transformation point of the austenite phase.

Furthermore, if the sheath 2 is bent, it can be restored to its shape in the same way as described above.

Note that the tightly wound coil 17 may be made of shape memory resin.

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

5 and 6 relate to the fourth embodiment, and FIG.
) is a perspective view of the connecting member, FIG. 5(b) is a perspective view of the connecting member when it is deformed, FIG. 6(a) is an explanatory view of the sheath in use, and FIG. 6(b) is an explanatory view of the sheath in use. , is an explanatory diagram of the sheath during cleaning.

In FIG. 6, the sheath 2 is constituted by close-wound coils 22 and 23 formed by tightly winding stainless steel wire, for example. The tightly wound coils 22 and 23 have a connecting member 18 that is cylindrical and has a slit 19 in the circumferential direction at the center.
They are connected together by. Furthermore, the sheaths 22, 23 are sheathed with an exterior tube 21, such as a Teflon tube, in which a slit 20 is provided at the same position as the slit 19.

The connecting member 18 is made of a two-way shape memory alloy, and the fifth
As shown in Fig. 5(b), the slit 19 is formed to have a large crack so that the shape is memorized, and after lowering the temperature below the martensitic transformation point, the slit 19 is formed as shown in Fig. 5(a). The closing member 18 is formed into a cylindrical shape, and this shape is memorized.

By the way, when cleaning the biopsy forceps 1, by heating the connecting member 18 above the transformation point of the austenite phase, the connecting member 18 is deformed into a state in which the slit 19 is greatly cracked as shown in FIG. 5(b). , an inlet for cleaning water is formed.

When returning the biopsy forceps 1 to the shape in use, one slit is closed by lowering the temperature to below the mardensite transformation point of the shape memory alloy forming the connecting member 18, and the sheath 2 is returned to the shape in use. Now you can go back to.

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

[Effects of the Invention] As explained above, according to the present invention, at least a part of the coil forming the sheath is made of a thermally deformable member such as a shape memory alloy, and the coil is deformed by temperature changes during cleaning. This has the effect of forming an inlet and a flow path for the cleaning water, and also being able to correct creases.

[Brief explanation of drawings]

1 and 2 relate to the first embodiment; FIG. 1 is an explanatory diagram showing the overall configuration of endoscopic biopsy forceps, and FIG. 2(a)
2(b) is an explanatory diagram of the sheath in use, FIG. 3(b) is an explanatory diagram of the sheath during cleaning, and FIG.
a) is an explanatory diagram of the sheath in use, FIG. 3(b) is an explanatory diagram of the sheath during cleaning, FIG. 4 relates to the third embodiment, and FIG. 4(a) is an explanatory diagram of the sheath during cleaning. Explanatory diagram, Figure 4(b) is an explanatory diagram of the sheath in use, Figures 5 and 6 are
Regarding the embodiment, FIG. 5(a) is) [■ Perspective view of active member,
FIG. 5(b) is a perspective view of the deformed connecting portion H, FIG. 6(a) is an explanatory view of the sheath in use, and FIG. 6(b) is an explanatory view of the sheath during cleaning. 1... Biopsy forceps 2... Sheath 3... Treatment section 4... Operation section 12... Coil 15.
...Operation Y V (.) Figure 4 (b) (a) (b) Figure 6 (0)

Claims (2)

[Claims] (1) In an endoscopic treatment instrument in which the sheath is constituted by a coil, at least a portion of the coil is constituted by a thermally deformable member, and the opening of the fluid flow passage or the flow passage is formed by temperature change. An endoscopic treatment instrument characterized by: (2) The endoscopic treatment instrument according to claim 1, wherein the thermally deformable member is a shape memory alloy.