WO2005027751A1

WO2005027751A1 - Thrombus/embolus collecting device

Info

Publication number: WO2005027751A1
Application number: PCT/JP2004/008455
Authority: WO
Inventors: Shin Ishimaru; Atsushi Kitamura
Original assignee: Shin Ishimaru; Atsushi Kitamura
Priority date: 2003-09-22
Filing date: 2004-06-16
Publication date: 2005-03-31
Also published as: JP3660931B2; JP2005095242A

Abstract

A thrombus/embolus collecting device (10), comprising a body part (1a) freely radially contracted and enlarged and normally radially enlarged in a cylindrical shape, a tail part (1b) formed continuously with the body part, freely radially contracted and enlarged, and normally radially enlarged in a tapered shape, a stent (1) formed continuously with the tail part and formed of a strut part (1c), and a bag-like (conical- shaped) filter (2) formed of an opening part (2a) and a body part (2b). The body part and the tail part of the stent are formed in a braided cord structure by spirally twisting one or a plurality of wires (W), the bag-like filter is inserted into the body part of the stent, and the opening part of the bag-like filter is engaged with the tip of the body part of the stent by an engagement means (5).

Description

Specification

Thromboembolic capture device

Technical field

[0001] The present invention relates to the treatment of vascular diseases such as stent or stent-graft placement, percutaneous angioplasty, or the like, or in the case of surgery, in which severe damage to the brain, heart, lung, liver, kidney, limb, etc. The present invention relates to a thromboembolic capture device that prevents an artery or a vein perfusing an organ from being blocked by a floating thrombus or embolus.

^ Scenic technology

[0002] In an aging society, arterial occlusion and aneurysms caused by arteriosclerosis have been significantly increased. Conventionally, the treatment of arterial occlusion and aneurysm has been performed mainly by surgery.Intravascular treatment using less invasive catheters has attracted attention recently. New technologies are being rapidly developed in the treatment of vascular diseases such as percutaneous angioplasty. However, in surgical revascularization surgery and endovascular treatment, thrombosis often forms in the blood vessel lumen and atheroma (atheroma) is detached from the blood vessel wall, depending on the surgical procedure and catheter operation. The problem is that these thrombus emboli block arteries or veins that perfuse critical organs such as the brain, heart, liver, kidneys, and limbs, and therefore, thrombus atheroma causes thromboembolism. was there. Similarly, in a normal surgical operation, a thrombus may be formed in a blood vessel lumen or an atheroma may be peeled off from a blood vessel wall. There was the problem of floating and causing thromboembolism. In particular, during endovascular treatment using the catheter technique, embolism due to floating thrombus atheroma cannot be directly observed or removed, so embolus due to floating thrombus atheroma may cause serious infarction such as myocardial infarction. There was a problem when complications were caused.

[0003] In order to solve these problems, a technique relating to a blood vessel filter system (hereinafter, referred to as "prior art 1") (Patent Document 1) and a technique relating to a device for filtering blood in a blood vessel (hereinafter, referred to as "prior art 1"). (Technique 2).) (Patent Document 2) Below, it is referred to as “Prior Art 3”. (Patent Document 3) has been proposed.

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-220062

Patent Document 2: Japanese Patent Application Laid-Open No. 2001-293084

Patent Document 3: JP-A-5-76535

Disclosure of the invention

Problems to be solved by the invention

[0004] While the prior arts 13 through 13 are designed to make the filter released into the blood vessel from the tubular catheter abut against the inner wall of the blood vessel, all of the techniques are skilled in positioning the filter in the blood vessel. In addition, when a filter that has trapped suspended matter such as a thrombus or embolus is collected in a catheter, the filter or stent cannot be sufficiently contracted, and cannot be stored in the catheter. There was a problem of damaging the inner wall.

[0005] An object of the present invention is to solve a powerful problem.

[0006] That is, the present invention can smoothly perform release and recovery from a catheter, easily position a place where a bag-shaped filter is to be placed in a blood vessel, and at the same time, In addition, the bag-shaped filter can be safely and securely placed without damaging the inner wall of the blood vessel, and the bag-shaped filter capturing the suspended matter such as thrombus and embolus in the blood vessel without damaging the inner wall of the blood vessel. It is an object of the present invention to provide a low-cost thromboembolic capture device that can be safely and reliably collected outside the body.

Means for solving the problem

[0007] The invention described in claim 1 is that, in a normal state in which the diameter can be freely reduced and expanded, the diameter of the main body portion becomes a cylindrical shape by expanding, and the diameter can be freely reduced and expanded provided following the main body portion. A thrombus having a tapered tail that expands in a normal state, a stent formed of a strut provided subsequent to the tail, and a bag-shaped filter formed of an opening and a main body. An embolic capture device,

(A) the main body portion and the tail portion of the stent are helically twisted by one or more filaments to form a braided structure, and

(B) The bag-shaped filter is inserted into the main body of the stent, and the opening of the bag-shaped filter is engaged with the tip of the main body of the stent by engaging means. A thromboembolic capture device characterized in that:

[0008] The invention described in claim 2 is the invention described in claim 1, wherein the filament is formed of a shape memory material, and the main body of the stent is expanded in a normal state to have a cylindrical shape. Thus, the shape is memorized, and the shape of the tail of the stent is tapered in a normal state.

[0009] The invention described in claim 3 is the invention according to claim 1 or 2, wherein the pillar portion is formed by twisting one or a plurality of filaments in a helical shape and a main body portion and a tail portion. It is characterized in that it has a braided structure that can be reduced in diameter and that is formed integrally with it, and is in a rod-shaped body that is reduced in diameter to a normal state in a normal state.

[0010] The invention described in claim 4 is the invention described in claim 3, characterized in that the filaments are made of a shape memory material.

[0011] The invention described in claim 5 is the invention according to claim 1 or 2, wherein the support portion is made of a synthetic resin such as polytetrafluoroethylene, polyolefin, polyester, polyurethane, or polysiloxane. Characterized by a hollow rod-like body composed of:

[0012] The invention described in claim 6 is the invention according to any one of claims 15 to 15, wherein a fold of a striated wire, a joint of two striated ends, a wire, It is characterized in that loops are formed at equal intervals by twisting or the like of the folded portions of the strip.

[0013] The invention described in claim 7 is the invention according to any one of claims 16 to 19, wherein the bag-shaped filter has a large number of micropores having a diameter of 10-300 / im. , A woven fabric, a nonwoven fabric, a net, or a perforated polymer film.

[0014] In the invention described in claim 8, in the invention described in claim 7, the bag-shaped filter is woven in a bag-like knitted fabric and a bag-like knitted yarn. It is composed of a woven fabric, a nonwoven fabric formed into a bag shape with a fiber ep, a net, or a polymer film formed directly into a bag shape from synthetic resin and then perforated. It is assumed that.

[0015] The invention according to claim 9 is the invention according to claim 7, wherein the bag-shaped filter is a knitted fabric, woven fabric, non-woven fabric, formed into a bag shape by bonding or sewing. Mesh Alternatively, it is characterized by being constituted by a perforated polymer film.

[0016] The invention according to claim 10 is the invention according to any one of claims 7 to 9, wherein the knitted fabric and the woven fabric are made of polyester yarn, polyamide yarn, polypropylene yarn, or ultrafine metal. It is characterized by being constituted by a line.

[0017] The invention according to claim 11 is the invention according to any one of claims 79, wherein the nonwoven fabric and the mesh are made of polyester fiber, polyamide fiber, polypropylene fiber, cellulose fiber, or a mixture thereof. It is characterized by being composed of mixed fibers.

[0018] The invention described in claim 12 is the invention according to any one of claim 79, wherein the polymer film is made of a fluororesin, a polyurethane resin, a polyester resin, a polyamide resin, or a polypropylene resin. It is characterized by comprising.

[0019] The invention according to claim 13 is the invention according to any one of claims 1-112, wherein the engaging means comprises: (a) sewing with a suture, and (b) an adhesive. Or (c) welding.

The invention's effect

[0020] The present invention has the following effects.

[0021] (1) According to the invention described in claims 1 and 35, (A) the main body portion and the tail portion of the stent are helically twisted by one or a plurality of filaments and braided. (B) the bag-shaped filter is inserted into the main body of the stent, and the opening of the bag-shaped filter is engaged with the tip of the main body of the stent 1 by engaging means. Since it is a combined filter, the release and collection from the catheter can be performed smoothly, and the location where the bag-shaped filter is to be placed in the blood vessel can be easily determined. Can be safely and reliably placed without damaging the inner wall of the blood vessel, and the bag-like filter that captures suspended matter such as thrombus and embolus in the blood vessel can be safely and reliably removed from the body without damaging the inner wall of the blood vessel. Low thromboembolic capture device Power to provide at cost S

[0022] (2) According to the invention described in claim 2, the filaments are formed of a shape memory material, and the main body of the stent is expanded in a normal state to have a shape memory so as to be cylindrical. And, the shape of the tail of the stent was made to be tapered during normal operation. It is possible to easily and inexpensively manufacture a stent having a body portion and a tail portion which is tapered in a normal state.

[0023] (3) According to the invention described in claim 6, a loop formed by folding back a wire, joining two wire ends, twisting a folded portion of a wire, or the like is formed at the distal end of the stent at equal intervals. As a result, the opening of the bag-shaped filter inserted into the main body of the stent can be easily engaged with the distal end of the stent by engaging means, and the distal end of the stent is formed as a loop. The inner wall of the body tubular body will not be damaged because it is smooth when it is used.

(4) According to the invention described in claims 7 to 12, the bag-shaped filter has a knitted cloth, a woven cloth, a nonwoven cloth, a mesh body, or a perforated cloth having a large number of micropores having a diameter of 10300 μm. Since it is made of a polymer film, it is possible to reliably capture floating substances such as thrombi and emboli in blood vessels without stopping the bag-like filter force S and blood flow.

[0025] (5) According to the invention described in claim 13, since the engaging means is (a) sewing with a suture, (b) bonding with an adhesive, or (c) welding, The engaging means does not damage the inner wall of the blood vessel.

Brief Description of Drawings

FIG. 1 is an explanatory view of a thromboembolic capture device showing one embodiment of the present invention, wherein (a) shows a stent, and (b) shows a bag-shaped (conical) filter. (C) is an A-A cross-sectional view of the filter of (b), and (d) shows that the bag-shaped filter is embedded in the main body of the stent in the expanded state, (B) shows a state in which the opening of the bag-shaped filter is engaged with the distal end of the main body of the stent by engaging means, and (e) shows the bag contained in the stent and its main body. 1 shows a state in which a filter having a shape of a letter is stored in a catheter.

FIG. 2 is an explanatory view of a thromboembolic capture device showing another embodiment of the present invention, wherein (a) shows a stent, and (b) shows a bag-like (U-shaped longitudinal section) shape. (C) shows a filter in which the bag-shaped filter is inserted into the main body of the stent in an expanded state, and the opening of the bag-shaped filter is engaged with the tip of the main body of the stent by engaging means. (D) shows a state in which the stent and a bag-shaped filter inserted in the main body thereof are stored in a catheter.

[FIG. 3] Description of a stent in a thromboembolic capture device showing another embodiment of the present invention. FIG.

[FIG. 4] The main body of the stent stored in the catheter and the bag-shaped filter inserted therein are released into the blood vessel branched from the aortic arch, and the blood is filtered by the bag-shaped filter. It is explanatory drawing which shows a state, (a) is the whole explanatory drawing, and (b) is the partial enlarged explanatory drawing.

Explanation of symbols

[0027] 1 and 11 stents

la, 11a body

lb, l ib tail

lc, 11c strut

Id, l id tip

2, 3 Bag filter

2a, 3a opening

2b, 3b main unit

2c Guide wire through hole

4 catheter

5 Engagement means

6 Guide wire

10, 20 Thromboembolic device

W streak

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present embodiment will be described with reference to the drawings.

FIG. 1 is an explanatory view of a thromboembolic capture device showing one embodiment of the present invention, wherein (a) shows a stent, and (b) shows a bag-shaped (conical) filter. (C) shows an A-A cross section of the filter of (b), and (d) shows that the bag-shaped filter is inserted into the main body of the expanded stent and the bag-shaped filter is inserted. (E) shows a state in which the opening of the filter is engaged with the distal end of the main body of the stent by engaging means, and (e) shows the bag-shaped filter inserted into the stent and the main body. 2 shows a state in which it is stored in a catheter. FIG. 2 shows another embodiment of the present invention. It is explanatory drawing of the thromboembolic capture device which shows embodiment, (a) shows a stent, (b) shows the filter of bag shape (U-shaped longitudinal section), (c) shows the said filter. A state in which the bag-shaped filter is inserted into the main body of the stent in the expanded state, and the opening of the bag-shaped filter is engaged with the distal end of the main body of the stent by engaging means, and (D) shows a state in which a bag-shaped filter inserted into the stent and its main body is stored in the catheter. FIG. 3 is an explanatory view of a stent in a thromboembolic capture device according to another embodiment of the present invention. Figure 4 shows that the main body of the stent housed in the catheter and the bag-shaped filter inserted therein are released into the blood vessel branched from the aortic arch and blood is filtered by the bag-shaped filter. It is explanatory drawing which shows a state, (a) is the whole explanatory drawing, and (b) is the partial enlarged explanatory drawing.

In FIG. 1, reference numeral 10 denotes a thromboembolic device. The thrombus embolus capture device 10 has a cylindrical body la that expands and expands in a normal state in which the diameter can be freely reduced and expanded, and a taper that expands and expands in a normal state in which the diameter can be freely expanded and contracted provided following the main body la. And a bag-shaped (conical) filter 2 composed of an opening 2a and a main body 2b. And (A) the main body portion la and the tail portion lb of the stent 1 are helically twisted by one or more filaments W to form a braided structure, and (B) The bag-shaped filter 2 is inserted into the main body la of the stent 1, and the opening 2a of the bag-shaped filter 2 is engaged with the tip Id of the main body la of the stent 1 by the engaging means 5. Have been. In FIG. 1, 2c is a hole for passing a guide wire, 4 is a force wire, and 6 is a guide wire.

In FIG. 2, reference numeral 20 denotes a thromboembolic capture device. The thromboembolic capture device 20 has a main body la that expands in a normal state where the diameter can be freely reduced and expanded, and a taper that expands and expands in a normal state where the diameter can be freely expanded and contracted provided following the main body la. And a bag-shaped (U-shaped longitudinal section) composed of an opening 3a and a main body 3b. And (A) a main body la and a tail lb of the stent 1 are helically twisted by one or a plurality of filaments W to form a braided structure, and (B) The bag-shaped filter 3 is inserted into the main body la of the stent 1 and the opening 3a of the bag-shaped filter 3 is It is engaged with the tip Id of the body part la by the engagement means 5. In FIG. 2, 4 is a catheter, and 6 is a guide wire.

FIGS. 1 and 2 show a bag-shaped filter 2 having a conical shape and a bag-shaped filter 3 having a U-shaped vertical section, but the bag of the present invention is not contradicted by the object of the present invention. The shape of the filter may be a bag-shaped filter other than these shapes.

The present invention provides a main body portion la that expands and becomes cylindrical in a normal state where the diameter can be freely reduced and expanded, and a taper that is provided following the main body portion la and expands in a normal state where the diameter can be freely expanded and contracted. A stent 1 composed of a tail portion 1b in the shape of a pillar and a strut portion lc provided following the tail portion lb, and a bag-shaped filter 2 composed of the openings 2a and 3a and the body portions 2b and 3b. (A) the main body la and the tail lb of the stent 1 are helically twisted by one or a plurality of filaments W to form a braided structure. And (B) the bag-shaped filters 2 and 3 are inserted into the main body la of the stent 1 and the openings 2a and 3a of the bag-shaped filters 2 and 3 are Since it is engaged with the tip Id of the main body part la by the engagement means 5, the release and collection from the catheter 4 can be performed smoothly, In this case, the location where the bag-shaped filters 2 and 3 are to be placed can be easily positioned, and the bag-shaped filters 2 and 3 can be placed safely and reliably at that location without damaging the inner wall of the blood vessel. In addition, a low-cost thromboembolic capture device that can safely and reliably recover a bag-like filter that captures suspended matter such as thrombus and embolus in a blood vessel without damaging the inner wall of the blood vessel is provided. can do.

The filament W constituting the stent 1 of the present invention is preferably formed of a shape memory alloy, that is, a shape memory alloy such as Ni—Ti, Cu—Al—ΝΰCu—Zn—A1, As long as the purpose of the present invention is not violated, it is formed of a metal such as stainless steel, nickel, and tantalum, and a synthetic resin such as polyester, polytetrafluoroethylene, polyolefin, and polyurethane. Further, a metal wire formed of a shape memory alloy or another metal may be covered with the above-mentioned synthetic resin.

[0035] When the filament W is formed of a shape memory material, the main body la of the stent 1 is expanded in a normal state so that the shape is memorized so as to be cylindrical, and the tail lb of the stent 1 is stored. The shape is memorized so as to be in a tapered shape under normal conditions. Thus, the filament W is composed of the shape memory material. Then, when the main body la of the stent 1 is expanded in a normal state and the shape is memorized so as to have a cylindrical shape, and the tail lb of the stent 1 is memorized so as to be a taper shape in a normal state. It is possible to easily and inexpensively manufacture a stent having a body portion la which is sometimes expanded in diameter and a tail portion lb which is tapered in a normal state.

[0036] The strut portion lc in the stent 1 preferably has a diameter-reducible braided structure in which one or a plurality of filaments W are helically twisted and formed integrally with the main body portion and the tail portion, And, it is a rod-shaped body which is reduced in diameter to a normal state in a normal state.

, Preferably made of a shape memory material.

As shown in FIG. 3, in the present invention, the support 11c of the stent 11 is a hollow rod-shaped body (pipe-shaped body) made of a synthetic resin such as polytetrafluoroethylene, polyolefin, polyester, polyurethane, or polysiloxane. Body). In FIG. 3, l la, l ib, and l id are the body, tail, and tip, respectively.

[0038] As shown in Figs. 1 and 3, in the stents 1 and 11 of the present invention, the ends ld and lid of the stents are folded back (the end portion Id of the stent 1 in Fig. 1 (a)). Loops are formed at equal intervals due to the joining of two filament ends and the twisting of the folded portions of the filaments. The “loop due to the fold of the filament” is formed while braiding the filament W so as to form the fold of the filament W at the tip Id of the stent 1 while forming a braided structure. `` Loop by joining the ends of two filaments '' is to cut the braided structure formed by weaving the filament W in the horizontal direction and weld and braze the ends of two filaments W and W adjacent to each other. It is formed by joining with the like. The “loop due to the twist of the filament” is formed by twisting the turn of the filament W. The loop according to the present invention is not limited to the loop formed by the above-described means, and may be formed by other means as long as it does not contradict the object of the present invention.

As described above, loops are formed at the ends ld and lid of the stents 1 and 11 at equal intervals by folding of the filament, joining of the two filament ends, and twisting of the folded portion of the filament. In this case, the opening of the bag-shaped filter inserted into the main body of the stent can be easily engaged with the distal end of the stent by the engaging means, and the distal end of the stent is formed as a loop. It is smooth and does not damage the inner wall of blood vessels. [0040] The bag-shaped filters 2 and 3 according to the present invention are composed of a knitted cloth, a woven cloth, a nonwoven cloth, a net, or a perforated polymer film having a large number of micropores having a diameter of 10-300 / im. I have. The bag-shaped filters 2 and 3 are preferably a knitted fabric knitted in a bag shape with yarn, a woven fabric woven in a bag shape with yarn, a nonwoven fabric formed in a bag shape with a fiber web, and a mesh body Or a plastic film formed directly from synthetic resin into a bag shape and then perforated, but formed into a bag-like knitted fabric or woven fabric by bonding or sewing. Even if it is made of cloth, non-woven fabric, mesh, or perforated polymer film, it can be used for power and control. The perforation of the polymer film is preferably performed by a known perforation other than the laser processing, as long as the force performed by the laser cutter is not contrary to the object of the present invention.

As described above, when the bag-shaped filter is formed of a knitted cloth, a woven cloth, a non-woven fabric, a net, or a perforated polymer film having a large number of micropores having a diameter of 10300 zm, It is possible to reliably capture suspended matter such as blood clots and emboli in the blood vessels without stopping the flow of Filteraka S.

[0042] The knitted fabric and the woven fabric are preferably made of polyester yarn, polyamide yarn, polypropylene yarn or ultrafine metal wire, and the nonwoven fabric and the mesh are preferably made of polyester fiber, It is composed of polyamide fiber, polypropylene fiber, cellulose fiber or a mixed fiber thereof, and the polymer film is preferably composed of fluororesin, polyurethane resin, polyester resin, polyamide resin or polypropylene resin. It is a thing.

In the present invention, the openings of the bag-shaped filters 2 and 3 inserted in the main body la of the stent 1 are

Force for engaging 2a, 3a with the distal end Id of the stent 1 by the engaging means ₅ The engaging means ₅ is preferably (a) sewn with a suture, (b) glued with an adhesive, or , (C) welding. Thus, if the engaging means 5 is (a) sewing with a suture, (b) bonding with an adhesive, or (c) welding, the engaging means 5 will not damage the inner wall of the blood vessel. Absent. The engaging means 5 in the present invention is an engaging means other than (a) sewing with a suture, (b) bonding with an adhesive, and (c) welding, as long as the object of the present invention is not contravened. It can be something like a snap.

[0044] The thromboembolic capture devices 10, 20 of the present invention are pre-installed in a neat catheter 4. You can leave it. If the thromboembolic capture devices 10 and 20 are stored in a sterilized state in the pipe-shaped catheter 4 in advance, they can be used immediately in an emergency. Needless to say, the thromboembolic devices 10, 20 may be stored in the catheter 4 immediately before use.

Next, the operation of the thromboembolic capture device of the present invention will be described.

(1) A bag obtained by knitting a polyester thread, a polyamide thread, a polypropylene thread, or an ultrafine metal wire into a bag inside the main body la of the stent 1 formed into a self-expandable braided structure. The filter 2 in the shape of a tube is inserted therein, and the opening 2a in the filter 2 in the shape of a bag is fixed to the distal end Id of the stent 1 with a suture. [Fig. 1 (d)]

(2) The bag-shaped (conical) filter 2 inserted into the main body la of the stent 1 in the thromboembolic capture device 10 is stored in a thin catheter 4 while being folded together with the main body of the stent. [Fig. 1 (e)]

(3) The thrombus embolus capturing device 10 having the filter 2 inserted in the main body la of the stent 1 stored in the catheter 4 is moved along the guide wire 6 previously arranged in the blood vessel. Then, after reaching the indwelling place in the blood vessel, by pulling the catheter 4 while fixing the support portion lc, the filter 2 pushed out into the blood vessel and expanded into the main body la of the stent 1 is expanded. [Figure 4]

[0049] (4) While performing treatments such as cardiovascular surgical treatment for heart disease and arteriovenous disease, and transcatheter endovascular treatment, the blood filter is kept expanded, and the treatment is completed. Then, by pushing back the force table 4 while holding the strut lc continuous to the tail lb of the stent 1, thromboembolism including the main body la of the stent 1 and the bag-shaped filter 2 inserted inside the main body la The capture device 10 is retracted and retracted into the catheter 4 while contracting. [Fig. 1 (e)]

(5) The thromboembolic capture device 10 re-stored in the catheter 4 is pulled out along the guide wire and taken out of the body.

As described above, when the thrombus embolus capturing device 10 including the main body portion la of the stent 1 and the bag-shaped filter 2 inserted therein is contracted and re-stored in the catheter 4, the bag-shaped fiber Since Inoreta 2 is sutured and fixed to the opening of stent 1, push back catheter 4 As a result, when stored in the catheter 4 while contracting as the taper of the tail lb converges, the suspended matter such as thrombus and emboli captured by the bag-shaped filter 2 is removed by the bag-shaped filter. Collected together with 2 in the catheter. According to the present invention, since the bag-shaped filter 2 can be expanded while the stent 1 is inserted into the main body la of the stent 1 to capture a floating substance such as a thrombus and an embolus, the floating substance such as a thrombus and an embolus can be captured. The bag-shaped filter 2 can be safely and reliably collected outside the body without damaging the blood vessel inner wall.

Claims

The scope of the claims

[1] A main body portion which expands in a normal state in which the diameter can be freely reduced and expanded to be cylindrical, a tail portion which is provided subsequent to the main body portion and which is expanded in a normal state in which the diameter can be freely expanded and contracted, and A thrombus embolus capturing device comprising: a stent configured by a strut provided subsequent to the tail; and a bag-shaped filter configured by an opening and a main body.

(B) The bag-shaped filter is inserted into the main body of the stent, and the opening of the bag-shaped filter is engaged with the tip of the main body of the stent by engaging means.

A thromboembolic capture device, comprising:

[2] The filament is formed of a shape memory material so that the main body of the stent expands in diameter in a normal state and has a shape memory so as to have a cylindrical shape, and the tail of the stent is tapered in a normal state. 2. The thromboembolism capturing device according to claim 1, wherein the shape is stored.

[3] The support portion has a diameter-reducible braided structure in which one or a plurality of filaments are helically twisted and formed integrally with the main body portion and the tail portion. 3. The thromboembolism capturing device according to claim 1, wherein the thrombus embolus capturing device is a rod-shaped body.

[4] The blood according to claim 3, wherein the filament is formed of a shape memory material.

[5] The method according to claim 1 or 2, wherein the support portion is a hollow rod made of a synthetic resin such as polytetrafluoroethylene, polyolefin, polyester, polyurethane, or polysiloxane. The thromboembolic capture device according to claim.

[6] The stent according to claim 15, characterized in that loops are formed at equal intervals on the distal end of the stent by folding of the filament, joining of two filament ends, and twisting of the folded portion of the filament. The thromboembolic capture device according to any one of the above.

[7] The bag-shaped filter is formed of a knitted fabric, a woven fabric, a nonwoven fabric, a net, or a perforated polymer film having a large number of micropores having a diameter of 10-300 / im. The thromboembolic capture device according to any one of claims 11 to 16.

[8] The knitted cloth in which the bag-shaped filter is knitted in a bag shape with yarn, or a knitted fabric woven in a bag shape with yarn. It is characterized by being composed of a nonwoven fabric, a net formed in a bag shape with a synthetic fabric or a fiber web, or a polymer film formed in a bag shape directly from a synthetic resin and then perforated. The thromboembolic capture device according to claim 7.

[9] The bag-shaped filter is characterized by being constituted by a knitted fabric, a woven fabric, a nonwoven fabric, a net, or a perforated polymer film formed into a bag shape by bonding or sewing. The thromboembolic capture device according to claim 7.

10. The blood according to claim 79, wherein the knitted fabric and the woven fabric are made of a polyester yarn, a polyamide yarn, a polypropylene yarn, or an ultrafine metal wire.

[11] The thromboembolism according to any one of claims 7 to 9, wherein the nonwoven fabric and the mesh are made of polyester fiber, polyamide fiber, polypropylene fiber, cellulose fiber or a mixed fiber thereof. Capture device.

12. The thromboembolic capture device according to claim 7, wherein the polymer film is made of a fluororesin, a polyurethane resin, a polyester resin, a polyamide resin, or a polypropylene resin. .

13. The method according to claim 11, wherein the engagement means is (a) sewing with a suture, (b) bonding with an adhesive, or (c) welding. Thromboembolic device.