JPS63160644A - Living body pipeline dilator - 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 a biological duct dilator for dilating a constricted part of a biological duct such as a bile duct, a blood vessel, or an esophagus when the duct is constricted.

[Conventional technology]

Conventionally, a prosthesis made of a shape memory alloy was introduced into the narrowed part of the bile duct, and the outer diameter of the prosthesis was expanded with heated physiological saline or the like to ensure bile circulation, as disclosed in JP-A No. 60-220030. It is proposed in the official gazette. The key to successful canal dilation using such a biological conduit dilator is to accurately guide the prosthesis to the stenotic area and to warm the prosthesis above body temperature to ensure its outer diameter expands. be.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional examples, the combination with the catheter before placing the prosthesis in the stenotic area is not specifically disclosed, and there is a possibility that the stenotic area cannot be dilated reliably, and the living tissue is There was a risk of injury.

The present invention was made by focusing on these problems.
The purpose is to provide a biological duct dilator that can safely and reliably indwell a prosthesis made of a shape memory alloy in a stenotic region.

[Means and operations for solving the problems] In order to solve the above problems, the present invention provides a catheter for introducing a prosthesis made of a shape memory alloy into a living body, and a holding part that removably holds the prosthesis; The present invention is characterized in that a physiological saline injection conduit for heating the prosthesis is provided.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) show a first embodiment of the present invention, and FIG. 1(a) is a cross-sectional view showing the biological duct dilator 1 inserted into a constricted part of the bile duct 2. (b) is a sectional view showing a state in which the narrowed portion of the bile duct 2 is expanded. This biological channel dilator 1 has a coil-shaped prosthesis 3 made of a shape memory alloy.
and a catheter 4 for introducing the prosthesis 3 into the living body, and the prosthesis 3 includes a first balloon 5 and a second balloon 6 provided at the distal end of the catheter 4.
It is held removably between the The above catheter 4
A physiological saline injection conduit 7 opening to the outer peripheral surface around which the prosthesis 3 is wound is provided inside, and the prosthesis 3 is heated by the physiological saline flowing out from the injection conduit 7.

Further, a balloon inflation conduit 8 is provided inside the catheter 4, and air or physiological saline is injected into the inside of the balloon 5.6 through this inflation conduit 8 to inflate the balloons 5 and 6. It has become. The transformation temperature of prosthesis 3 is set to be higher than body temperature. Specifically, the transformation start temperature from the martensite sum on the low temperature side to the austenite phase on the high temperature side is set at around 38°C, and the transformation end temperature is set at around 38°C.
It is set at around 5℃.

Next, a method of using the present extension tool 1 configured as described above will be explained. First, an insertion section of an endoscope (not shown) is inserted into a body cavity, and its distal end is positioned near the duodenal papilla. Then, the living body channel dilator 1 is inserted into the forceps channel of the endoscope, protrudes from the distal end component of the endoscope, and the distal end portion of the living body channel dilator 1 is pushed and inserted into the nipple opening. At this time, the balloons 5 and 6 are
Air or saline is injected into the inside of the balloon to inflate the balloons 5 and 6 in advance as shown in FIG. 1(a). This prevents the prosthesis 3 from moving in the axial direction, and since the balloon 5.6 is inserted while pushing the bile duct 2 apart, there is no fear of damaging the inner wall of the bile duct 2.

Next, in this state, from the physiological saline injection pipe 7, 38℃~45℃
Physiological saline at a temperature of about 0.degree. C. is injected into the bile duct 2 between the balloons 5 and 6. As a result, the prosthesis 3 is heated to a temperature higher than body temperature by the physiological saline injected into the bile duct 2, and its outer diameter expands as shown in FIG. 1(b). Then, by removing the air or physiological saline injected into the inside of the balloons 5, 6 and deflating the balloons 5, 6 as shown in FIG. 1(b), only the catheter 4 can be pulled out from inside the bile duct 2. Therefore, the prosthesis 3 can be safely and reliably placed in the narrowed part of the bile duct 2. In addition, although the prosthesis 3 made of a unidirectional shape memory alloy was shown in the above embodiment, a bidirectional shape memory alloy may also be used. Also,
As shown in FIG.
0 may be provided.

FIGS. 3(a) and 3(b) show a third embodiment of the present invention, in which the prosthesis 3 is formed by spirally rotating a strip-shaped shape memory alloy. Also, prosthesis 3
is provided inside the tubular catheter 4, and is pushed out from inside the catheter 4 by a flange 11 slidably provided at the rear thereof. A rod 12 is connected to the flange 11. Further, the flange 11 is provided with a physiological saline outflow hole 13, through which the physiological saline flows out to heat the prosthesis 3.

Therefore, in this embodiment, the bile duct 2 is
The biological duct dilator 1 is inserted into the body, and its distal end is positioned at the narrowed part of the bile duct 2. Then, the prosthesis 3 is pushed out from inside the catheter 4 by operating the rod 12 connected to the flange 11, and the prosthesis 3 is injected into the bile duct 2 through the saline outflow hole 13 with physiological saline at a temperature of 38 to 45°C. By heating the tube to a temperature higher than body temperature, the stenosis can be dilated as shown in FIG. 3(b).

4 and 5 show a fourth embodiment of the present invention, in which the prosthesis 3 is formed by bending a plate shape memory alloy into a cylindrical shape. A balloon 14 is provided at the distal end of the catheter 4.
A prosthesis 3 is wound and fixed on the outside of the. Therefore, in this embodiment, the balloon 1 is
6 is inflated, the biological duct dilator 1 is inserted into the bile duct 2, and then the air or physiological saline, etc. in the balloon 16 is removed, and the dilator 3 is inserted into the balloon 16 through the physiological saline injection conduit 7.
The prosthesis 3 can be heated by injecting physiological saline at 8-45°C.

FIG. 6 shows a fifth embodiment of the present invention, in which the prosthesis 3 is a cylindrical elastic body 1 made of silicone rubber or the like.
It is formed by embedding a shape memory alloy coil 16 in 5. The prosthesis 3 is fitted onto the small diameter portion 17 provided at the distal end of the catheter 4, and is heated with physiological saline injected from the saline injection conduit 8, so that the outer diameter of the prosthesis 3 is adjusted to the outside diameter of the catheter 4. It has a structure in which it is detached from the catheter 4 when it becomes larger than the diameter.

FIGS. 7(a) and 7(b) show a sixth embodiment of the present invention, and this embodiment has a wire 1 made of a plurality of shape memory alloys.
This embodiment uses a prosthesis 3 in which one end of the catheter 8 is fixed and the other end is expanded, and the prosthesis 3 is provided inside a tube-shaped catheter 4 as in the third embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, a catheter for introducing a prosthesis made of a shape memory alloy into a living body includes a means for removably holding the prosthesis, and a physiological saline injection conduit for warming the prosthesis. With this provision, the prosthesis can be safely and reliably placed in the stricture, and the circulation of bile, etc. can be ensured.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) show an embodiment of the present invention;
a) is a sectional view showing a state in which the biological duct dilator is inserted into the bile duct, FIG. FIG. 2 is a cross-sectional view of a living body channel dilator showing an example. 1... Biological channel expander, 3... Prosthesis, 4
···catheter. Applicant's representative Patent attorney Jun Tsuboi Figure 1 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A biological tube, characterized in that a catheter for introducing a prosthesis made of a shape memory alloy into a living body is provided with a holding part for removably holding the prosthesis, and a physiological saline injection conduit for warming the prosthesis. tract widening device.