JPH07155331A - Tubular organ treatment tool - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a therapeutic device for a tubular organ used for, for example, inserting a coil into an aneurysm of a blood vessel to prevent rupture of the aneurysm. [Structure] The guide wire 11 is formed by fixing coils 13 and 14 to the outer periphery of a core wire 12 having a thin tip. At the tip of the guide wire 11, a first shape memory alloy is used.
The engaging portion 16 is provided. In addition, the second engaging portion 24 is provided at the proximal end of the indwelling device 21 formed of the double coil 22, and the first engaging portion 16 and the second engaging portion 24 are engaged with each other to guide the guide wire 11. The indwelling device 21 is connected to the tip. When the indwelling device 21 is inserted into, for example, an aneurysm of a blood vessel, when hot water or the like is injected and heated, the first engaging portion 16 is deformed by the shape restoring force to disengage the above-mentioned indwelling device 21.
Can be separated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tubular organ of the human body,
For example, the present invention relates to a device for treating a tubular organ used for appropriately inserting an indwelling device for treating an aneurysm, a blood vessel obstructing device for preventing a large amount of bleeding, a stent for expanding a tubular organ, and the like. .

[0002]

2. Description of the Related Art There are various tubular organs in the human body that cannot be reached by external surgery, or when external surgery is complicated. However, a method has been taken in which a drug, a dilator, a plugging substance, or the like is placed and treatment is performed. For example, when treating an aneurysm formed in a blood vessel, a catheter is guided through the blood vessel to the aneurysm, a metal coil or the like is inserted into the arterial flow through the catheter, and the inside of the aneurysm is filled with the metal coil or the like to form a thrombus. It is used to prevent the inflow of blood and prevent the aneurysm from rupturing.

FIG. 12 shows an example of the above-mentioned treatment method. That is, the parent catheter 2 is inserted into the blood vessel 1 in which the aneurysm 1a is formed, and when the tip of the parent catheter 2 reaches the vicinity of the aneurysm 1a, the balloon 3 attached to the outer circumference of the tip of the parent catheter 2 is inserted. Inflate and fix the tip position of the parent catheter 2.

In this state, the child catheter 4 is inserted through the parent catheter 2, and the tip of the child catheter 4 is inserted into the aneurysm 1.
It is placed at the entrance of a. Then, the coil 5 made of platinum or the like is inserted into the child catheter 4, and the guide wire 6 as a pusher pushes the coil 5 into the aneurysm 1a from the tip of the child catheter 4. Thus, the aneurysm 1a is closed by inserting a large number of coils 5 into the aneurysm 1a.

As another method, a metal coil to be indwelled in an aneurysm is attached to the tip of the guide wire, and the tip of the guide wire is inserted into the aneurysm to electrolyze the metal. A therapeutic device has been proposed in which the coil is separated from the tip of the guide wire and left in the aneurysm (for example, Japanese Patent Application Publication No. 5-5003).
22).

Further, a method of inserting a microballoon into an aneurysm to occlude it is also known. That is, a method of attaching a balloon to the tip of a microcatheter, guiding it into an aneurysm, inflating the balloon with a curing agent, and then separating it.

Further, other methods for occluding an aneurysm include a method of inserting silk thread into the aneurysm, a method of inserting beads made of ethylene-vinyl acetate copolymer, and a method of injecting a liquid plugging substance. Proposed.

[0008]

However, as shown in FIG.
In the method shown in FIG. 2, when the coil 5 is pushed out from the child catheter 4, if the coil 5 does not completely enter the aneurysm 1a and protrudes toward the flow path of the blood vessel 1, the coil 5
Due to this, the flow path of the blood vessel 1 may be blocked. In this case, once the coil 5 has been pushed out from the child catheter 4, it cannot be pulled back to the child catheter 5, so the doctor has to spend a great deal of time in pushing out the coil 5 carefully.

Further, in the method of attaching a metal coil to the tip of the guide wire and separating it by electrolysis, after confirming that the metal coil is placed in the aneurysm, it can be separated from the guide wire by applying electricity. However, the energization time required to disconnect the metal coil is very long.
As shown in FIG. 2, since the blood flow in the blood vessel 1 is temporarily stopped by using the balloon 3, there is a time limitation and there is a problem that the device becomes large-scale. Further, there is a possibility that metal ions may be eluted into blood due to electrolysis and adversely affect the human body.

Further, in the method of inserting a microballoon into an aneurysm to occlude it, since the shapes of the balloon and the aneurysm do not match, the aneurysm may be deformed by the balloon and stress may be applied, or the balloon may be erroneously detached. was there.
If the balloon ruptures inside the aneurysm, the aneurysm itself is very likely to rupture.

Furthermore, in the method of inserting silk thread, synthetic resin beads, or liquid plugging substance into the aneurysm to occlude the aneurysm, all of these substances are easily washed away by the bloodstream, so that other parts of the blood vessel are blocked. There is a possibility that it may flow into the flow path and block the flow path.

Therefore, an object of the present invention is to make it possible to promptly separate a device, such as a coil, to be indwelled in the body, after confirming that the device is safely and surely placed at a desired position. It is to provide a treatment tool for organs.

[0013]

In order to achieve the above object, the tubular organ treatment device of the present invention is a tubular organ treatment device in which a body indwelling device is detachably attached to the distal end portion of a linear member. An engaging portion that engages with each other is provided at the distal end of the linear member and the proximal end of the indwelling device, and at least the engaging portion provided at the distal end of the linear member has a shape memory. It is made of an alloy, and is configured to be disengaged by deforming the engaging portion provided at the tip of the linear member when the temperature reaches or exceeds the transformation point of the shape memory alloy. It is characterized by

In the present invention, as the linear member,
Guidewires are preferred. As the guide wire, one having a core wire formed so that its tip portion becomes gradually thinner and a coil fixed to the outer circumference of the tip portion of this core wire is preferably used. It is more preferable that the tip of the coil is radiopaque. To make the tip of the coil radiopaque, the tip of the coil is made of gold,
A method of forming an X-ray opaque substance such as platinum or a method of plating the tip of the coil with an X-ray opaque substance such as gold or platinum is used. However, as the guide wire, in addition to the above, a so-called resin guide wire in which a metal core wire is covered with a synthetic resin film can also be used. In this case, the engaging portion is preferably joined to the tip end portion of the core wire.

Further, as one preferable mode of the engaging portion, a loop-shaped portion formed at a proximal end portion of the indwelling device and a loop-shaped portion formed at a distal end portion of the linear member. And a grip-shaped part that engages in a chain with
The grip-shaped portion is made of a shape memory alloy, and the grip-shaped portion is opened and disengaged at a temperature equal to or higher than the transformation point of the shape memory alloy.

As another preferable mode of the engaging portion,
A loop-shaped portion formed on the proximal end of the indwelling device,
The grip-shaped portion formed in the tip portion of the linear member, which engages in a chain with the loop-shaped portion, and the grip-shaped portion is always elastically biased in the opening direction,
It is held in a closed state by a coil of shape memory alloy that is pressed against its outer periphery, and when the temperature reaches or exceeds the transformation point of the shape memory alloy, the coil is deformed to open the grip shape portion. It is possible to name a structure that cancels the relationship.

As still another preferred aspect of the engaging portion, the engaging portion is provided at the U-shaped portion made of a shape memory alloy formed at the distal end of the linear member and at the proximal end of the indwelling device. A coil portion is pressed against the outer circumference of the U-shaped portion, and has a structure in which the U-shaped portion is closed and the engagement is released when the temperature reaches or exceeds the transformation point of the shape memory alloy. To be

As still another preferred mode of the engaging portion, a coil portion provided at a proximal end portion of the indwelling device in the body,
A coil portion made of a shape memory alloy, which is provided at the distal end portion of the linear member and is pressed against the outer circumference of the coil portion at the proximal end portion of the indwelling device, and when the temperature is equal to or higher than the transformation point of the shape memory alloy. The coil member provided at the distal end portion of the linear member has a structure in which its diameter is expanded and the engagement is released.

As still another preferred mode of the engaging portion, a coil portion provided at a proximal end portion of the indwelling device in the body,
It is provided at the distal end of the linear member, and is composed of a half-cylindrical portion made of a shape memory alloy that grips the coil portion of the proximal end of the indwelling device, and at a temperature equal to or higher than the transformation point of the shape memory alloy, An example is a structure in which a half-cylindrical cylindrical portion provided at the tip of the linear member is opened to release the engagement.

A double coil is preferably used as the indwelling device in the body. However, the present invention is not limited to this, and those having various shapes and materials such as one having a shape like a test tube brush, one in which fibers are sandwiched between the pitches of coils, and the like can be used. The indwelling device in the body is also preferably radiopaque. For example, a device made of gold, platinum, or the like, or a product of stainless steel, shape memory alloy, or the like having a surface plated with gold, platinum, or the like is preferable. Used.

[0021]

In order to treat an aneurysm of a blood vessel using the treatment tool of the present invention, first, a catheter is inserted into the blood vessel, and its tip is placed at the entrance of the aneurysm. Then, the treatment tool of the present invention is inserted through the catheter, and the indwelling device in the body connected to the distal end of the linear member through the engaging portion is inserted into the aneurysm.

After confirming that the indwelling device in the body has been completely inserted into the aneurysm by, for example, an X-ray fluoroscopic camera,
Hot water or the like is injected through the catheter to heat the engaging portion. As the heating method, a means such as high frequency induction heating can be adopted. When the engaging portion is heated in this manner, the engaging portion at the tip of the linear member made of a shape memory alloy is deformed to disengage from the indwelling device in the body, and the indwelling device in the body is placed in the aneurysm.

Thus, when the indwelling device is placed inside the aneurysm, the indwelling device fills the aneurysm and creates a thrombus, so that the inflow of blood into the aneurysm is blocked and the aneurysm is ruptured. Can be prevented.

According to the present invention, as described above, it is possible to separate the indwelling device after confirming that the indwelling device has been placed in the predetermined position. If the indwelling device is not in the proper position, The linear member can be pulled to pull the indwelling device back into the catheter, and the operation can be redone.

By injecting hot water or the like, the engaging portion made of the shape memory alloy can be instantly deformed, and the indwelling device in the body can be released. Therefore, the insertion work of the indwelling device in the body can be performed reliably and safely, and the burden on the doctor and the patient can be reduced.

[0026]

1 to 3 show an embodiment of a device for treating a tubular organ according to the present invention. As shown in FIG. 1, the tubular organ treatment tool includes a guide wire 11 and an indwelling device 21 that is separably connected to a distal end portion of the guide wire 11. The guide wire 11 has an elongated core wire 12 made of an elastic metal wire. The proximal end side of the core wire 12 forms an enlarged diameter portion 12a, and a small diameter portion 12b extends from the middle to the tip end portion. The enlarged diameter portion 12a serves as a grip portion for the insertion operation, and the small diameter portion 12b serves as a portion to be inserted into the body. As the material of the core wire 12, for example, a metal wire material having elasticity such as stainless steel, a piano wire, an amorphous alloy, or a shape memory alloy is preferably used. The thickness of the small diameter portion 12b of the core wire 12 is preferably about 0.05 to 0.4 mm,
It is more preferably 0.2 mm or less.

On the outer periphery of the small diameter portion 12b of the core wire 12,
A first coil 13 made of stainless steel, a piano wire, an amorphous alloy, a shape memory alloy or the like is arranged on the base side of the core wire 12, and a second coil 13 made of an X-ray opaque material such as gold or platinum is provided on the tip side of the core wire 12. The coil 14 of is fixed. These coils 13, 14 have brazing filler metal 15 at both ends thereof.
Is joined to the core wire 12. A first engaging portion 16 made of a shape memory alloy and having a Y shape is fixed to the tip of the coil 14 by a brazing material 15.
The diameter of the coils 13 and 14 is preferably 0.25 to 0.45 mm.

The outer circumferences of the coils 13 and 14 may be coated with a synthetic resin film such as polyethylene, polyvinyl chloride, polyester, polypropylene, polyamide, polyurethane, polystyrene, fluororesin, and silicone rubber. Furthermore, the surface of the synthetic resin film may be coated with a hydrophilic polymer by a method such as forming a functional group such as an isocyanate group and binding a hydrophilic polymer such as polyethylene glycol to the functional group. Examples of such a hydrophilic polymer include resins disclosed in Japanese Patent Publication No. 14991/1991.

On the other hand, the indwelling device 21 is composed of a double coil 22 made of an X-ray opaque material such as gold, platinum, or a metal whose surface is plated with gold. The head 23 of the double coil 22 is formed into a round shape by means of melting or the like so that the head 23 can be easily inserted into the tubular organ without damaging the tubular organ. Also, double coil 2
A second engaging portion 24 having a loop shape is formed at the base end of 2. The diameter of the primary coil of the double coil 22 is preferably 0.25 to 0.4 mm, and its length is preferably 50 to 400 mm. The diameter of the secondary coil of the double coil 22 is preferably 3 to 8 mm.

FIG. 2 shows an engagement state between the first engaging portion 16 formed at the distal end of the guide wire 11 and the second engaging portion 24 formed at the proximal end of the indwelling device 21. ing. That is, the tip end portion of the first engaging portion 16 having a grip shape is inserted into the second engaging portion 24 having a loop shape,
By being closed, the chain is engaged. Incidentally, 51 is a catheter for inserting the guide wire 11 and the indwelling device 21 and is made of a synthetic resin tube. Further, a contrast tip 52 around which a platinum coil or the like is wound is attached to the tip of the catheter 51. However, any commercially available catheter may be used.

FIG. 3 shows the operation of the first engaging portion 16. That is, the first engagement portion 16 is made of a grip-shaped member made of a shape memory alloy, and the distal end portion thereof is closed in a loop shape as shown on the left side of the drawing, so that the second engagement portion 16 is formed. It is engaged with the portion 24 in a chain shape. Then, for example, when hot water is poured and heated to the transformation temperature of the shape memory alloy or higher, it opens in a C shape as shown on the right side of the drawing, and the engagement with the second engaging portion 24 is released. There is. In this case, the transformation point of the shape memory alloy is 35 to 9
0 degreeC is preferable, and 45-80 degreeC is more preferable.

Next, a method for treating an aneurysm of a blood vessel using the treatment tool for tubular organs shown in FIGS.

First, a catheter 51 is percutaneously inserted into a blood vessel using a puncture needle, and the catheter 51 is inserted at the entrance of the aneurysm.
Place it so that the tip of is reached. Next, the therapeutic device of the present invention is inserted into the catheter 51 with the double coil 22 of the indwelling device 21 extended linearly, and the indwelling device 21 is pushed out from the distal end of the catheter 51 to cause an aneurysm. To place. When the indwelling device 21 is pushed out from the catheter 51, the double coil 22 returns to its shape and
It becomes a dimensionally entangled shape. Since the proximal end portion of the indwelling device 21 is connected to the distal end portion of the guide wire 11 via the engaging portions 24 and 16, the position thereof is appropriate even after being pushed out from the catheter 51 once. If not, it can be pulled back into the catheter 51 and the operation can be redone.

Next, when it is confirmed that the indwelling device 21 has been securely inserted into the aneurysm, warm physiological saline is poured through the catheter 51, or by means of heater heating, high frequency induction or the like. Engagement parts 16, 2
Heat 4. As a result, the first engaging portion 16 made of a shape memory alloy returns to its original shape, the tip portion is opened as shown on the right side in FIG. 3, and the engagement with the second engaging portion 24 is released.
As a result, the indwelling device 21 is separated from the guide wire 11 and placed in the aneurysm. Thus, the indwelling device 21
When placed in an aneurysm, it returns to the double coil and fills the aneurysm, creating a thrombus that prevents blood from flowing into the aneurysm and prevents rupture of the aneurysm. it can.

The therapeutic device of the present invention may be
Various types of indwelling devices can be connected and used. This can be used not only for treating an aneurysm as described above, but also for inserting a blood vessel obstructing device that blocks a blood vessel in order to prevent a large amount of bleeding when the blood vessel is damaged due to an accident or the like. It can also be used to insert a stent to expand a tubular organ. Furthermore, it can also be used for a so-called drug delivery system (DDS) in which drugs such as capsules and tablets are carried to the affected area and left there.

4 and 5 show another embodiment of the device for treating a tubular organ according to the present invention. In addition, the substantially same parts as those of the embodiment of FIGS.

This tubular organ treatment tool is the same in other respects except that the first engaging portion of the guide wire 11 of the treatment tool shown in FIGS. That is, the first engaging portion 30 is composed of a gripping-shaped metal member 31 having elasticity, such as stainless steel, and a shape memory alloy coil 34 wound around the outer periphery of the metal member 31.

As shown in FIG. 4, protrusions 32 are formed inside the tips of the grip-shaped metal members 31, and when the tips are closed, the protrusions 32 are used for the second engagement. It is adapted to engage the loop of section 24.
Further, protrusions 33 are also formed on the outer sides of the tip portions, and the shape memory alloy coil 34 is formed on the protrusions 33.
Is caught and holds the tip closed.

In this tubular organ treatment tool, heated physiological saline or the like is injected through a catheter or the like, and the first engaging portion 30 is heated, as shown in FIG. 34 returns to its original shape, gets over the protrusion 33, and contracts in the axial direction. As a result, the coil 34 is disengaged from the tip of the metal member 31, and the tip of the coil 34 opens outward due to the elasticity of the metal member 31 itself. Therefore, the engagement between the first engaging portion 30 and the second engaging portion 24 is released, and the indwelling device 2 in the body is released.
1 comes to separate.

6 and 7 show still another embodiment of the device for treating a tubular organ according to the present invention. 1 to 3
Parts that are substantially the same as those in the embodiment of FIG.

This tubular organ treatment device is the same in other configurations except that the first and second engaging portions of the guide wire 11 of the treatment device shown in FIGS. is there. That is, as shown in FIG. 6, the first engaging portion 35 is made of a shape memory alloy and has a U-shaped tip, and the second engaging portion 36 is the end of the coil. . The outer periphery of the base of the first engaging portion 35 is coiled by means such as brazing.
It is fixed to 4. Further, a large number of concaves and convexes 35a which are cut out in an arc shape are formed on the outer periphery of the tip end portion of the first engaging portion 35, and the tip end portion is opened to the outside, whereby the second engagement portion is formed on the concave and convex portion 35a. The inner circumference of the coil of the joint portion 36 is fitted and engaged.

In this tubular organ treatment device, heated physiological saline or the like is injected through a catheter or the like, and the first engaging portion 35 is heated, as shown in FIG. The leading end portion of the first engaging portion 35 returns to its shape and closes, and as a result, the fitting between the unevenness 35a of the first engaging portion 35 and the inner circumference of the coil of the second engaging portion 36 is released. The indwelling device 21 is separated.

8 and 9 show still another embodiment of the device for treating a tubular organ according to the present invention. 1 to 3
Parts that are substantially the same as those in the embodiment of FIG.

This tubular organ treatment device is the same in other configurations except that the first and second engaging portions of the guide wire 11 of the treatment device shown in FIGS. 1 to 3 are changed. is there. That is, as shown in FIG. 8, the first engaging portion 40 is a shape memory alloy coil connected to the coil 14 that constitutes the guide wire 11, and the second engaging portion 41 is the indwelling device 2 in the body.
It is composed of a coil forming a base end portion of 1. And the first
The shape memory alloy coil of the engaging portion 40 of the second engaging portion 4
The outer circumference of the first coil is pressed into contact with the outer circumference of the first coil so that they are engaged with each other. In the figure, 51 is a catheter, and 52 is a contrasting chip provided at the tip thereof.

In this tubular organ treatment tool, heated physiological saline or the like is injected through a catheter or the like, and the first engaging portion 40 is heated, as shown in FIG.
The shape memory alloy coil of the engaging portion 40 of the first engaging portion 40 returns to its shape and is expanded in diameter, and the coil portion of the second engaging portion 41 becomes the first engaging portion 40.
The internal indwelling device 21 is separated by being pulled out from the inside.

10 and 11 show still another embodiment of the device for treating a tubular organ according to the present invention. Note that FIG.
Parts that are substantially the same as those of the first to third embodiments are designated by the same reference numerals, and description thereof will be omitted.

This tubular organ treatment tool also has the same structure except that the first and second engaging portions of the guide wire 11 of the treatment tool shown in FIGS. 1 to 3 are changed. is there. That is, as shown in FIG. 10, the first engaging portion 45 is made of a half-cylindrical member made of a shape memory alloy and fixed to the distal end of the coil 14 forming the guide wire 11, and the second engaging portion 45 is formed. The joint portion 46 is composed of a coil that forms a proximal end portion of the indwelling device 21. As shown in FIG. 11, the first engaging portion 45
Includes a half-cylindrical portion 45a and a fixing portion 45b brazed to the end of the coil 14, and the half-cylindrical portion 45 is provided.
Engagement is performed by caulking a and gripping the second engaging portion 46. In FIG. 10, reference numeral 51 is a catheter, and 52 is a contrasting chip provided at two locations on the tip thereof. In this embodiment, the contrasting tips 52 at the two locations are attached at intervals of about 40 mm.

In this tubular organ treatment tool, heated physiological saline or the like is injected through a catheter or the like, and the first engaging portion 45 is heated. The portion 45a opens outward, the second engaging portion 46 is released, and the indwelling device 21 is separated.

[0049]

As described above, according to the device for treating a tubular organ of the present invention, the indwelling device for the body is released from the tip of the linear member by the shape restoring force of the shape memory alloy. Since it is connected through the catheter, even if the catheter is once pushed out, if it is desired to correct the insertion position, it can be pulled back into the catheter and the operation can be repeated. Then, after confirming that the indwelling device is placed at an appropriate position, for example, by flowing heated physiological saline or by inducing high frequency, it is possible to instantly separate the indwelling device. Therefore, the insertion work can be performed safely and reliably in a short time.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a device for treating a tubular organ of the present invention.

FIG. 2 is a partially enlarged view showing an engaging portion of the therapeutic device.

FIG. 3 is an explanatory view showing the operation of the first engaging portion of the therapeutic device.

FIG. 4 is a partially enlarged view showing another embodiment of the tubular organ treatment device of the present invention.

FIG. 5 is a partial enlarged view showing a state in which the treatment tool is disengaged.

FIG. 6 is a partially enlarged view showing still another embodiment of the treatment device for tubular organs of the present invention.

FIG. 7 is a partially enlarged view showing a state in which the engagement of the therapeutic device is released.

FIG. 8 is a partially enlarged view showing still another embodiment of the treatment device for tubular organs of the present invention.

FIG. 9 is a partial enlarged view showing a state in which the engagement of the therapeutic device is released.

FIG. 10 is a partially enlarged view showing still another embodiment of the treatment device for tubular organs of the present invention.

FIG. 11 is a perspective view showing a first engagement portion of the therapeutic device.

FIG. 12 is an explanatory view showing an operation of inserting an indwelling coil inside a blood vessel aneurysm using a conventional treatment tool.

[Explanation of symbols]

 11 Guide Wire 12 Core Wires 13, 14 Coil 15 Brazing Material 16, 30, 35, 40, 45 First Engagement Part 21 Internal Indwelling Device 24, 36, 41, 46 Second Engagement Part 31 Metal Member 34 Shape Memory Alloy coil 35a Concavo-convex 51 Catheter

Front Page Continuation (72) Inventor Shingo Sewa 2806-4 Inoguchi, Nakai-cho, Ashigarakami-gun, Kanagawa Prefecture (72) Inventor Atsushi Ogawa 1673-1 Kaneko, Oi-cho, Ashigagami-gun, Kanagawa Prefecture

Claims (9)

[Claims] 1. A therapeutic device for a tubular organ in which a body indwelling device is detachably attached to a distal end portion of a linear member, wherein a distal end portion of the linear member and a base end portion of the body indwelling device are: Engagement portions that engage with each other are provided, and at least the engagement portion provided at the tip end portion of the linear member is formed of a shape memory alloy, and when the temperature becomes equal to or higher than the transformation point of the shape memory alloy, A treatment tool for a tubular organ, characterized in that the engagement is provided by deforming an engagement portion provided at a distal end portion of the linear member. 2. The device for treating a tubular organ according to claim 1, wherein the linear member is a guide wire. 3. The treatment of a tubular organ according to claim 2, wherein the guide wire is composed of a core wire formed so that a distal end portion is gradually thinned, and a coil fixed to an outer circumference of the distal end portion of the core wire. Ingredient 4. The engagement portion is engaged with the loop-shaped portion formed at the proximal end portion of the indwelling device and the loop-shaped portion formed at the distal end portion of the linear member in a chain shape. And a grip shape portion made of a shape memory alloy, and the grip shape portion is opened and disengaged at a temperature equal to or higher than a transformation point of the shape memory alloy. Item 5. A tubular organ treatment tool according to any one of Items 1 to 3. 5. The engagement portion engages in a chain shape with a loop-shaped portion formed at a proximal end portion of the indwelling device and a loop-shaped portion formed at a distal end portion of the linear member. The grip-shaped portion is elastically biased in the opening direction at all times, but the grip-shaped portion is held in a closed state by the shape memory alloy coil pressed against the outer periphery of the grip-shaped portion. The structure of the tubular organ according to any one of claims 1 to 3, wherein the coil is deformed to open the grip-shaped portion at a temperature equal to or higher than the transformation point of (1) to release the engagement. Therapeutic tool. 6. The U-shaped portion made of a shape memory alloy formed at the tip of the linear member and the base end of the indwelling device in the body, wherein the engagement portion is provided. 5. The structure according to claim 1, wherein the U-shaped portion is closed and the engagement is released at a temperature equal to or higher than a transformation point of the shape memory alloy. The treatment device for a tubular organ according to one. 7. The engagement portion includes a coil portion provided at a proximal end portion of the indwelling device inside the body and a coil portion provided at a tip end portion of the linear member at a proximal end portion of the indwelling device inside the body. And a coil portion made of a shape memory alloy pressed against the outer periphery, and when the temperature is equal to or higher than the transformation point of the shape memory alloy, the coil portion provided at the tip of the linear member expands in diameter and the engagement becomes The treatment device for a tubular organ according to any one of claims 1 to 3, which has a structure to be released. 8. The engagement portion includes a coil portion provided at a proximal end portion of the indwelling device in the body and a coil portion provided at a distal end portion of the linear member, the coil portion being at a proximal end portion of the indwelling device in the body. It consists of a half-divided cylinder made of a shape-memory alloy to be gripped, and when the temperature exceeds the transformation point of the shape-memory alloy, the half-divided cylinder provided at the tip of the linear member opens and the engagement is released. The tubular device treatment tool according to any one of claims 1 to 3, which has the structure described above. 9. The device for treating a tubular organ according to claim 1, wherein the indwelling device in the body comprises a double coil.