JPH0679001A - Working jig mechanism in fine tube - Google Patents

Abstract

PURPOSE:To obtain a working jig mechanism for a fine pipe generating no heat, capable of well controlling a degree of expansion and excellent in fineness. CONSTITUTION:The working jig mechanism is constituted by providing a light reflecting plate 3 to the front of a light guide 4 and arranging operation rods 1 composed of an optical strain bimorph to the periphery of the light reflecting plate in a dispersed state to attach them to the outer edge part of the light guide 4. By this constitution, this mechanism can be opened and closed through light and can safely be adapted to a living body such as a blood vessel without generating an electric shock and constitutional members can compactly be received in the base of the light guide and an open state can appropriately be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intra-tubular working tool mechanism utilizing a photostrictive bimorph, which is suitable for forming a tool for removing extraneous matter in a tube and a device for expanding a blood vessel.

[0002]

2. Description of the Related Art Conventionally, as a mechanism for removing adhered substances in blood vessels such as atheroma, there has been known a laser light irradiating device capable of dissolving the adhered substances by laser light. However, there is a problem that the blood vessel is damaged by the heat when the laser light is irradiated. On the other hand, as a blood vessel expansion mechanism, there has been known one in which a balloon is supplied to a predetermined position in the blood vessel to inflate it. However, there is a problem that it is difficult to control the degree of expansion according to the inner diameter and wall thickness of the blood vessel.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to develop a mechanism for a working tool in a thin tube which can control the degree of expansion well without generating heat and is excellent in thinness.

[0004]

According to the present invention, a light reflecting plate is provided in front of a light guide, and actuating rods made of optical distortion bimorph are dispersed around the light reflecting plate to dispose the light reflecting plate on the outer edge portion of the light guide. (EN) Provided is a work implement mechanism in a thin tube characterized by being attached.

[0005]

With the above structure, the light radiated through the light guide is reflected by the light reflecting plate and supplied to the inside of the actuating rod made of the optical distortion bimorph arranged around it, whereby the actuating rod has a small diameter outside. The side bends to form an open (expanded) state. The degree of the open state can be controlled by the intensity of irradiation light. On the other hand, when the light irradiation is stopped, the operating rod is restored to the original state (closed state). Therefore, it is possible to control the opening and closing of the actuating rod arranged around the light reflecting plate by irradiating light and stopping it, and the opening operation can be utilized for the expansion of blood vessels and the like. On the other hand, the attached matter in the thin tube can be scraped off by applying the tip of the actuating rod in the open state to the attached section.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The working mechanism in a thin tube of the present invention is one in which actuating rods made of a photostrictive bimorph are dispersed around a light reflecting plate provided in front of a light guide and attached to the outer edge of the light guide. . Examples are shown in FIGS. 1 and 2. Reference numeral 1 is an actuating rod made of a photostrictive bimorph, 3 is a light reflecting plate, and 4 is a light guide. Reference numeral 2 is a coating film that covers the entire plurality of actuation rods. The coating film is provided as necessary for the purpose of preventing damage to blood vessels and forming a smooth open state, and is made of a stretchable material such as a rubber polymer.

A plurality of actuating rods 1 made of a photostrictive bimorph are dispersedly arranged around the light reflecting plate 3, and one end thereof is adhesively fixed to the sleeve 5. This allows
Each actuating rod can be bent back in each direction through light irradiation to form an open state. The sleeve 5 incorporates the light guide 4 and forms an outer edge portion thereof.

An appropriate number of actuating rods can be arranged according to the form of the thin tube to be worked. Generally, in the case of a polygonal tube such as a triangular tube or a rectangular tube, the number of the edges is equal to or greater than the number of the edges. In the case of a circular pipe, three or more are arranged. Further, the form of the actuating rod may be an appropriate form depending on the work purpose and the like. In that case, a lateral bar or a curved bar may be added to the distal end portion of the actuating rod to form an appropriate shape such as a T-shape or a Y-shape.

In the photostrictive bimorph, as shown in FIG. 1, a photostrictive material 11 that expands when irradiated with light and an electrostrictive material 12 that deforms when an electric field is applied (substantially the same as the photostrictive material) are polarized. Can be formed by arranging them side by side and providing electrodes 13 at both ends thereof. As a result,
As described above, when the photostrictive material 11 is irradiated with light, a voltage is generated and expanded, and the voltage is applied to the electrostrictive material 12 via the electrodes 13 at both ends to contract the electrostrictive material. As a result, the photostrictive bimorph forms a curved state in which the electrostrictive material side has a small diameter, returns to the original state when the light irradiation is stopped (Fig. 1), and opens and closes via the actuation rod as described above. Can be achieved.

Examples of the photostrictive material or the electrostrictive material include quartz, ZnS, La ₂ S ₃ , SbSI, SbSI / SbSBr,
KH ₂ PO ₄ , KH ₂ PO ₄ · KD ₂ PO ₄ , glycine sulfate,
Rb ₂ ZnBr ₄ , α-LiIO ₃ (Cr added), LiNbO ₃ , L
iNbO ₃ (Fe added), KNbO ₃ (Fe added), SbNb
O ₄ , (Sr, Ba) Nb ₂ O ₆ , (Pb, La) Nb ₂ O ₆ , Ba
₂ NaNb ₅ O ₁₅ (Fe, Mo added), BaTiO ₃ , BaTiO ₃
(Fe addition), BaTiO ₃ · CaTiO ₃ , PbTiO ₃ , Pb
_{TiO 3 · La (Zn 2/3 Nb} 1/3) O 3, PbTiO 3 · Pb (M
g _1/2 W _1/2 ) O ₃ , PbZrO ₃ · PbTiO ₃ (Nb added),
(Pb, La) (Zr, Ti) O ₃ , K (Ta, Nb) O _{3 and the} like.

In the embodiment, the light reflection plate 3 is arranged in front of the light guide 4 via the holder 31 thereof,
Moreover, it is arranged so that the light emitted through the light guide 4 is reflected to the actuation rod side. The light reflecting plate may be formed by using an appropriate light reflecting material such as a mirror or a metal layer.

The light guide 4 is a holder 31 for the light reflecting plate.
Is arranged around the tail portion of the light reflecting plate 3 so that the light can be reflected coaxially with the light reflecting plate 3 and reflected evenly in the direction of the operating rod. The light guide 4 in the illustrated example has an optical fiber bundle 41 surrounding the holder 31.
Although it is formed integrally by providing a coating layer 42 on the outer periphery of the above, in the present invention, a light guide of an appropriate form can be used. The light source for irradiating the actuating rod made of the photostrictive bimorph with light is usually arranged at the end of the light guide.

As described above, in the mechanism for working in a thin tube of the present invention, light is irradiated (arrow) to the inside of the actuation rod 1 (on the side of the optical distortion member 11) via the light guide 4 and the light reflecting plate 3. As a result, each actuating rod 1 is deformed as shown in FIG. 2 so that the tip end side is bent back to form an open state, and when the light irradiation is stopped, the actuating rod 1 is restored and returns to its original form, forming a closed state as shown in FIG. .

The work implement mechanism in the thin tube of the present invention is arranged at a required position while observing the inside of a blood vessel or a thin tube by, for example, being provided at the tip of a light guide provided in an image guide, and the working rod is illuminated with light. It can be applied to various methods such as irradiating with, to expand the blood vessel in an appropriately opened state, and scraping off adhered substances on the inner wall of the tube. When applied to a living body, a necessary function such as antithrombotic property is imparted by a surface treatment method with an antithrombotic agent or the like, if necessary.

[0015]

According to the present invention, it is possible to obtain an intra-tubular working tool which can be opened and closed through light, is free from the risk of electric shock, does not generate heat, and can be safely applied to a living body such as a blood vessel.
Further, it is possible to obtain a working tool which can house the constituent members in a compact manner with the light guide as a base, has excellent thinness, and can appropriately control the opened state.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of an example (closed state).

FIG. 2 is an explanatory cross-sectional view of an example (opened state).

[Explanation of symbols]

 1: Actuating rod made of optical distortion bimorph 3: Light reflector 4: Light guide

Claims (1)

[Claims] 1. A thin tube characterized in that a light reflecting plate is provided in front of the light guide, and actuating rods made of optical distortion bimorph are dispersedly arranged around the light reflecting plate and attached to the outer edge portion of the light guide. Internal work implement mechanism.