JP3878971B2 - Temporary indwelling stent graft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a temporary indwelling stent graft used for examination or emergency treatment for arterial stenotic disease and dilated disease (aneurysm) or other diseases, and more particularly, to permanently place a stent graft in a blood vessel such as an artery. Used to inspect the presence or absence of blood flow in an important blood vessel that is temporarily placed in the blood vessel and then branches, or to temporarily stop in a damaged blood vessel such as an emergency patient to stop hemostasis To a recoverable self-expanding stent graft.
[0002]
[Prior art]
  Aneurysms that occur due to arteriosclerosis or inflammation, etc., will gradually expand if left untreated, resulting in a poor prognosis leading to fatal rupture, and the effect of drug therapy can hardly be expected. Conventionally, surgical operations using an artificial blood vessel, for example, aneurysm excision surgery and replacement surgery have been used. However, this disease is common among elderly people, and is frequently accompanied by multiple organ disorders (brain, heart, kidney, etc.), and the surgical operation is often excessively invasive. Surgery is limited to safe ones that can avoid these risks. Accordingly, the application of endovascular treatment using a catheter with relatively light surgical invasion has attracted worldwide attention, and treatment with a stent or stent graft is also expected as one of the applications.
[0003]
  A stent is an artificial cylindrical structure that is inserted into a body tubular organ such as a blood vessel in order to support the body tubular organ such as a blood vessel. For example, when a tubular body such as a blood vessel, gallbladder, esophagus, intestine, or urethra is stenotic or deformed, the stent is inserted into the tubular body to support the tubular body. To prevent. A stent that has been widely applied clinically for the purpose of treating arterial stenosis is a cylindrical body formed of a mesh or spring made of stainless steel or a shape memory alloy (NiTi) wire. This cylindrical body can be repeatedly contracted and expanded in the radial direction. In addition, a cylindrical body made of stainless steel or nickel titanate wire as described above is inserted or extrapolated into an artificial blood vessel (graft) made of polyester or fluororesin, and is sutured and fixed. It is considered a blood vessel. This endovascular artificial blood vessel is called a stent graft and is effectively used for the treatment of aneurysms. These stents and stent grafts are disclosed in, for example, JP-A-7-24072, JP-A-7-47134, JP-A-7-500202, JP-A-8-299456, JP-A-8-502428. It is known in the art as described in Japanese Patent Laid-Open No. 8-511487.
[0004]
  Such a stent or stent graft is placed in an affected area in a blood vessel via a catheter. That is, the stent or stent graft is compressed to a diameter smaller than the inner diameter of the thin pipe-shaped catheter and stored in the catheter, and this is inserted from the incision portion of the peripheral artery (mainly the femoral artery) to the affected portion in the blood vessel. Therefore, the stent or stent graft is pushed out from the catheter, radially expanded to a predetermined diameter, and placed in the affected area in the blood vessel, thereby expanding the arterial stenosis lesion or blocking the aneurysm and simultaneously reconstructing the blood flow. To achieve. The treatment with stents or stent-grafts not only reduces the burden on the patient because the surgical invasion is mild, but can also be applied to aneurysm diseases that have been excluded from the conventional application. It is a beneficial treatment for patients with diseases and diastolic diseases.
[0005]
  However, conventional stents or stent-grafts cannot be re-contracted after being released from the catheter and expanded in the blood vessel, so that they cannot be re-contracted. When this occurs, there is a problem that these cannot be moved or collected.
[0006]
  And, in order to reliably close the aneurysm by its placement, the conventional stent graft is placed over a wide range including not only the site of the aneurysm but also the central and peripheral normal arteries, It is necessary to ensure adhesion between this and the inner surface of the artery, but at that time, there was a problem that the stent graft also occludes the main artery branching from the vicinity of the aneurysm and causes organ damage . For example, in the abdominal aorta, the renal artery, inferior mesenteric artery, internal iliac artery, and other arteries are occluded, resulting in impaired renal function and intestinal ischemic injury. There is a risk of developing medullary blood flow disturbance, which is a serious complication of lower body movement paralysis.
[0007]
  Accordingly, the present inventor previously temporarily placed a stent or stent graft that can be collected outside the body in the affected area in the blood vessel before placing the conventional stent or stent graft as described above in the affected area in the blood vessel. Alternatively, if a risky site where a blood flow disorder or the like occurs when the stent graft is placed in a blood vessel and a safe site where such a blood flow disorder does not occur are known in advance, the conventional stent or stent graft can be used as a blood vessel. A stent or a stent graft that can be recovered outside the body after being temporarily placed in the affected part in the blood vessel was proposed (Japanese Patent Laid-Open No. 10-337333).
[0008]
  FIG. 3 is an explanatory view showing a state in which a conventional temporary indwelling stent graft is pushed out from a catheter and expanded. In FIG. 3, 111 is a temporary indwelling stent graft. The temporary indwelling stent graft 111 has a stent body 112 provided in front thereof and strut wires 118 provided in the rear thereof. The stent main body 112 has three elastic rings 114 in which metal wires bent in a zigzag shape are formed in an annular shape. The elastic ring 114 is made of stainless steel, titanium, shape memory alloy, or the like. Around the elastic ring 114, eight connecting lines 115 are arranged at equal intervals in the circumferential direction, and these connecting lines 115 are welded or brazed at the intersection of the elastic rings 114 to form an elastic cylindrical body 113. Has been. The elastic cylindrical body 113 is covered with a graft 129 made of a fiber fabric such as polyester, polyurethane, or fluororesin. The graft 129 is secured to the three elastic rings 114 with sutures.
[0009]
  A parallel portion 116 is formed by a connecting line 115 at a portion following the elastic cylindrical body 113. The strut wire 118 has a distal end portion 119 connected to the rear end of the parallel portion 116 of the stent main body 112 and extends backward as a bundle. The connecting wire 115 and the support wire 118 are made of a continuous shape memory alloy. The bundle of strut wires 118 is slightly smaller than the inner diameter of the catheter 131. The length of the support wire 118 is long enough to penetrate the catheter 131 and to be operated outside the body when the stent body 112 is in a predetermined position in the blood vessel. The stent body 112 and the strut wire 118 have rigidity that can withstand pushing out from the catheter 131 and pulling into the catheter 131 by an operation from outside the body. The distal end portion 132 of the catheter 131 is rounded so that the stent body 112 can be smoothly contracted and housed.
[0010]
  When the elastic cylinder state 123 covered with the graft 129 is contracted in the radial direction, it becomes equal to or smaller than the inner diameter of the catheter 131 and can be stored in the catheter 131. The stent body 122 is designed to expand to an outer diameter of about 20 to 40 mm according to the thickness of the blood vessel so that the blood vessel can be sufficiently expanded after being pushed out from the catheter 131 and expanded.
[0011]
[Problems to be solved by the invention]
  Conventional temporary indwelling stent grafts have no problem when used by inserting into a bendable internal tubular organ, but this is not a stenotic disease of arteries and expandable disease (aneurysm) or other diseases. In order to treat this, there are the following problems when inserted into an extremely bent body tubular organ.
[0012]
  That is, when a conventional temporary indwelling stent graft is inserted into an extremely bent body tubular organ, for example, the arch aorta, the distal arch aorta, the distal descending aorta (directly above the diaphragm) and the abdominal artery, The bends of adjacent elastic rings in the stent at the inner curve part contact or cross each other through the graft to generate wrinkles in the graft, which can hinder blood flow flow, or In the worst case, there was a problem that thrombus was generated. In addition, when a conventional temporary indwelling stent graft is extruded into such an extremely bent body tubular organ and left in place for a while, the temporary indwelling stent graft is bent to match the bending of the blood vessel. Since it is tightly fixed to the inner wall of the blood vessel, when the temporary indwelling stent graft is pulled into the catheter after the completion of the examination or treatment, the graft rubs the inner wall of the blood vessel, which causes a problem of damaging the inner wall of the blood vessel.
[0013]
  The present invention aims to solve this problem.
  That is, an object of the present invention is to provide a temporary indwelling stent graft that does not impede the flow of bodily fluids or damage the inner wall even when inserted into an extremely bent body tubular organ. It is said.
[0014]
[Means for Solving the Problems]
  In order to achieve the above object, the invention described in claim 1 is a stent in which one or a plurality of filaments are spirally twisted to form a braid structure, and a temporary indwelling stent graft having a graft ,
  (A) The stent is a body portion that can be expanded and contracted in a normal state and expands into a cylindrical shape in a normal state, a tail portion that expands in a normal state and is tapered following the main body portion, and Consists of a reduced-diameter column provided following the tail,
  (B) The main body of the stent isThe aboveCoated with a graft, and
  (C)The front end of the graft is engaged with the front end of the stent by engagement means so that the front surface and the back surface of the graft can be sequentially rotated from the front end to the rear end of the graft.
This is a temporary indwelling stent graft.
[0015]
  The invention described in claim 2 is the invention described in claim 1, wherein the distal end of the stent is,Loops due to wrapping of wire, joining of two wire ends, twisting of folds of wireAre formed at regular intervalsIt is characterized by this.
[0016]
  The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the engaging means is a suture thread.
[0017]
  The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein the filament is made of a shape memory material, and the main body portion of the stent is expanded in a normal state to form a cylinder. The shape is memorized so as to be in a shape, the shape of the tail portion of the stent is memorized so as to be tapered in a normal state, and the shape of the support portion of the stent is memorized so as to be in a reduced diameter state. Is.
[0018]
  The invention described in claim 5 is characterized in that the temporary indwelling stent graft according to any one of claims 1 to 4 is stored in a pipe-shaped catheter.
[0019]
  The invention described in claim 6 is characterized in that, in the invention described in claim 5, the tip portion of the pipe-shaped catheter is curved so as to spread outward.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the present embodiment will be described with reference to the drawings.
  FIG. 1 is an explanatory view of a temporary indwelling stent graft showing an embodiment of the present invention, where (a) shows a stent and (b) shows a stent covered with a graft (temporary indwelling stent graft). (C) shows a state where the temporary indwelling stent graft is stored in the catheter. FIG. 2 is an explanatory diagram of a temporary indwelling stent graft showing an embodiment of the present invention, in which (a) shows the temporary indwelling stent graft pushed out of the catheter, and (b) shows the stent portion. (C) shows the state in which the graft portion has been turned over with the stent portion almost completely retracted into the catheter, and (d) is inverted. The state which is going to store the graft part of the state in the state in a catheter is shown.
[0021]
As shown in FIG. 1, a temporary indwelling stent graft 10 of the present invention has a stent 1 and a graft 2 formed by braiding one or a plurality of filaments W into a braid structure. is doing. The stent 1 is freely expandable and contractible, and a main body 1a that expands into a cylindrical shape in a normal state, a tail portion 1b that expands in a normal state and is tapered following a main body 1a, and It is composed of a strut portion 1c in a reduced diameter state provided following the tail portion 1b. The main body 1a of the stent 1 is covered with the graft 2, andThe front end 2a of the graft 2 is engaged with the front end 1d of the stent 1 by the engaging means 3 so that the front surface and the back surface of the graft 2 can be sequentially rotated from the front end to the rear end of the graft 2.
[0022]
  Stents having such a “braid structure” are known in the art as described in, for example, JP-A-11-57021, JP-A-9-173469, and JP-B-4-47575. . As described in these publications, the stent 1 in the present invention may have a “braid structure” in which a single filament W is spirally twisted into a braid structure. In addition, it may have a “braid structure” in which a plurality of filaments W are twisted in a spiral shape to form a braid structure. The temporary indwelling stent-graft 10 of the present invention is extremely flexible because the stent 1 has such a “braided structure”. For this reason, it is intended for examination of blood flow disorders, hemostasis of emergency patients, and the like. As appropriate, while repeatedly extruding and re-storing inside the internal tubular organ with the bent indwelling stent graft 10 extremely bent, such as the arch aorta, the distal arch aorta, the distal descending aorta (just above the diaphragm) and the abdominal artery Even if it is moved to a proper position and is temporarily placed in the aorta, it can be safely and tightly fixed to the inner wall of the aorta without inhibiting the flow of blood flow due to the wrinkles generated in the graft.
[0023]
  According to the temporary indwelling stent graft 10, for example, when the temporary indwelling stent graft 10 is temporarily placed in a thoracic aortic aneurysm, it is continuously monitored by a spinal cord evoked potential measuring device over a certain period of time, and is branched from there. After measuring the presence or absence of spinal cord ischemia due to the blockage of arterial blood flow and confirming safety by the absence of organ ischemia, if the indwelling stent-graft 10 is to be placed in an abdominal aortic aneurysm, it is divided from there. After measuring the urine volume due to blood flow blockage of branching arteries, the occurrence of intestinal ischemia, etc., and confirming the safety by the presence of steady urine volume and absence of intestinal ischemia, a permanent indwelling stent or stent graft ( (Not shown) can be accurately placed and fixed at a safe site in the aorta, and there is a risk of organ ischemia that was previously excluded from application The risk of aneurysms, etc. that have developed in a pointed artery can also be known in advance, which can expand the application of permanent indwelling stents or stent grafts, and for many patients with aneurysms, etc. Can provide a beneficial treatment.
[0024]
  Further, according to the temporary indwelling stent graft 10, after temporarily indwelling in an aneurysm and measuring the presence or absence of spinal cord ischemia, abdominal important organ ischemia, etc. for a certain time, the tail 1b and main body 1a of the stent 1 are catheterized. From the tip 2a portion (the portion fixed by the engaging means 3) of the graft 2 that has been tightly fixed to the inner wall of the blood vessel while being stored in 4Over the endSince it can be peeled off while being sequentially rotated, the inner wall of the blood vessel is not damaged.
[0025]
  In the stent 1 according to the present invention, loops are formed at regular intervals at the distal end 1d by folding, joining, twisting, and the like of the filament. In this way, when the loops are formed at equal intervals on the distal end 1d of the stent 1,The front end of the graft 2 can be engaged with the loop by the engagement means 3 so that the front surface and the back surface of the graft 2 can be sequentially turned from the front end to the rear end of the graft.Further, since the distal end 1d of the stent 1 is smooth when formed by the loop, the inner wall of the body tubular body is not damaged.
[0026]
  In the temporary indwelling stent graft of the present invention, preferably, the filament W is made of a shape memory material, and the main body portion 1a of the stent 1 is expanded in a normal state so as to have a cylindrical shape. The shape of the tail 1b can be memorized so as to be tapered in the normal state, and the shape of the support 1c of the stent 1 can be memorized so as to be in a reduced diameter state. Thus, when the filament W of the stent 1 is made of a shape memory material, the stent 1 is formed using a cylindrical mesh body (not shown) formed of the filament W of a shape memory alloy having a “braid structure”. The portion of the main body 1a of the stent 1 is expanded in diameter in a normal state so as to have a cylindrical shape, the portion of the stent 1 as a tail 1b is memorized in a shape of a taper in a normal state, and the stent 1 By storing the shape of the support portion 1c so as to be in a reduced diameter state, the stent 1 having a complicated structure can be easily manufactured at low cost.
[0027]
  The filament W constituting the stent 1 in the present invention is preferably formed of a shape memory alloy, that is, a shape memory alloy such as Ni—Ti, Cu—Al—Ni, or Cu—Zn—Al. Unless it is contrary to the above-mentioned purpose, it can be formed of metals such as stainless steel, nickel and tantalum, and synthetic resins such as polyester, polytetrafluoroethylene, polyolefin and polyurethane. Further, a metal wire formed of a shape memory alloy or other metal may be coated with the synthetic resin as described above.
[0028]
  In the distal end 1d of the stent 1 in the present invention, the line is folded back (see the folding of the filament W of the distal end portion 1d of the stent 1 in FIG. 1A), the joining of the two filament ends, and the folding of the filament. A loop is formed by twisting the part. The “loop by the folding of the filament” is formed while creating the braid structure by weaving the filament W so as to form the folding of the filament W at the end 1d of the stent 1. “Loop by joining two wire ends” is a braided structure formed by weaving the wire W, cut in the horizontal direction and welded, brazed, etc. at the ends of the two adjacent wires W, W Are formed by bonding. The “loop by twisting of the wire” is formed by twisting the turn of the wire 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 the object of the present invention is not violated.
[0029]
  The engaging means 3 for engaging the distal end of the graft 2 with the distal end 1d of the stent 1 is, for example, a suture. When the engaging means 3 is a suture, the suture is flexible, so that the suture does not damage the inner wall of the blood vessel. The engaging means 3 may be an engaging means 3 such as gluing or heat bonding as long as it does not contradict the object of the present invention.
[0030]
  The temporary indwelling stent graft 10 of the present invention may be stored in the pipe-shaped catheter 4 in advance. If the temporary indwelling stent graft 10 is stored in a sterilized state in the pipe-shaped catheter 4 in advance, it can be used immediately in an emergency. Of course, the temporary indwelling stent graft 10 may be stored in the catheter 4 immediately before use.
[0031]
  The pipe-shaped catheter 4 in the present invention is preferably curved so that the distal end portion spreads outward. When the distal end portion of the pipe-like catheter 4 is curved so as to spread outward in this way, the extruded body 1a of the stent 1, the distal end 1d of the stent 1 engaged by the engaging means 3, and the graft Since the distal end 2 a of 2 and the inverted graft 2 do not catch on the distal end 4 a of the catheter 4, the temporary indwelling stent graft 10 can be smoothly restored into the catheter 4.
[0032]
  Next, the operation of the temporary indwelling stent graft of the present invention will be described.
  (A) As shown in FIG. 1 (c), a graft 2 is coated on the main body 1a of the stent 1, andThe front end 1d of the stent 1 is engaged with the front end 1d of the stent 1 by the engaging means 3 so that the front surface and the back surface of the graft 2 can be sequentially rotated from the front end to the rear end of the graft.A temporary indwelling stent graft 10 is prepared, folded, compressed and stored in the catheter 4.
[0033]
  (B) As shown in FIG. 2 (a), a guide wire (not shown) in which the temporary indwelling stent graft 10 stored in the catheter 4 is disposed in advance from the incision portion of the peripheral artery (mainly the femoral artery). After reaching the aneurysm generation position in the bent aorta by inserting along the catheter, the catheter is fixed (supported) with the hand so as not to move the strut portion 1c (having a length of 1 to 1, 5 mm). By pulling 4, the covered portion of the graft 2 of the temporary indwelling stent graft 10 is pushed out of the catheter 4, and is self-expanded to tightly fix the graft 2 to the blood vessel wall.
[0034]
  (C) As shown in FIG. 2 (b), after the temporary indwelling stent graft 10 is temporarily placed in the aneurysm and the presence or absence of spinal cord ischemia, abdominal vital organ ischemia, etc. is measured for a certain period of time, the strut 1c The catheter 4 is pushed out to the inner diameter portion of the graft 2 while the catheter 4 is fixed, and then the distal end 4a of the catheter 4 is almost pushed out to the joining means 3, and the tail portion 1b and the main body of the stent 1 are pulled by pulling the support portion 1c. The part 1a is sequentially re-stored in the catheter 4.
[0035]
  (D) As shown in FIG. 2 (c), when the catheter 4 and the strut 1c of the stent 1 are pulled while the tail 1b and the main body 1a of the stent 1 are stored in the catheter 4, they are tightly fixed to the inner wall of the blood vessel. The graft 2 that had been removed from its tip (fixed by the engaging means 3)Over the endIt is peeled off while being sequentially rotated.
[0036]
  (E) As shown in FIG. 2 (d), when the support column 1 c is pulled while the catheter 4 is fixed, the turned graft 2 is sequentially stored in the catheter 4 from the distal end 4 a of the catheter 4.
[0037]
  (F) After measuring the absence of organ ischemia in this way and confirming safety, the permanent indwelling stent or stent graft is placed and fixed at a safe position in the aorta.
[0038]
【The invention's effect】
  (1) According to the invention described in claim 1, the following effects can be obtained.
  (I) According to the temporary indwelling stent graft of the present invention, since the stent has a “braid structure”, the stent is extremely flexible, and therefore, for the purpose of examination of blood flow disorders, hemostasis of emergency patients, etc. As appropriate with repeated extruding and re-storing within the internal bent organs, such as the arch aorta, the distal arch aorta, the distal descending aorta (just above the diaphragm) and the abdominal artery Even if it is moved to a position and temporarily placed in the aorta, it can be safely and tightly fixed to the inner wall of the aorta without inhibiting the flow of blood flow due to the wrinkles generated in the graft.
[0039]
  (B) According to the temporary indwelling stent graft of the present invention, for example, when the temporary indwelling stent graft is temporarily indwelled in a thoracic aortic aneurysm, continuous monitoring by a spinal cord evoked potential measuring device is performed for a certain period of time. After measuring the presence or absence of spinal cord ischemia due to blockage of the blood flow in the intercostal artery, and confirming safety by eliminating organ ischemia, and when placing a temporary indwelling stent graft in an abdominal aortic aneurysm, After measuring the urine volume due to blockage of the blood flow of the artery branching from the intestine, the occurrence of intestinal ischemia, etc., and confirming the safety by having a steady urine volume and no intestinal ischemia, The stent graft can be accurately placed and fixed at a safe site in the aorta, and therefore, in a bent artery with a risk of organ ischemia, which was previously excluded from application. The risk of a living aneurysm, etc. can be known in advance, which can expand the application of permanent indwelling stents or stent grafts and provide a beneficial treatment for many aneurysms and other patients it can.
[0040]
  (C) According to the temporary indwelling stent graft of the present invention, after temporarily indwelling in an aneurysm and measuring the presence or absence of spinal cord ischemia, abdominal vital organ ischemia, etc. over a certain period of time, the stent tail and body are catheterized. The graft that was tightly fixed to the inner wall of the blood vessel in the state of being stored in the inside from the tip part (part fixed by the engaging means)Over the endSince it can be peeled off while rotating sequentially, it can be peeled off while rotating sequentially,
It does not damage the inner wall of the blood vessel.
[0041]
  (2) According to the invention described in claim 2, since the loops are formed at equal intervals on the distal end of the stent, the distal end of the graft can be engaged with the distal end of the stent by the engaging means so as to be able to rotate. Moreover, since the tip of the stent is smooth when it is formed of a loop, the inner wall of the body tubular body is not damaged.
[0042]
  (3) According to the invention described in claim 3, since the engaging means is a suture, the inner wall of the blood vessel is not damaged.
[0043]
  (4) According to the invention described in claim 4, the filament is made of a shape memory material, the shape of the main body of the stent is expanded so as to become a cylindrical shape in a normal state, and the tail of the stent is formed. In the normal state, the shape is memorized so as to be tapered, and the shape of the support portion of the stent is memorized so as to be in a reduced diameter state. Therefore, a stent having a complicated structure can be manufactured easily and at low cost. .
[0044]
  (5) According to the invention described in claim 5, since the temporary indwelling stent graft is stored in the pipe-shaped catheter, if it is stored in a sterilized state in advance in the pipe-shaped catheter, Can respond immediately to use.
[0045]
  (6) According to the invention described in claim 6, since the distal end portion of the pipe-shaped catheter is curved so as to spread outward, the main body portion of the extruded stent and the stent engaged by the engaging means Because the tip and graft tip and the inverted graft do not catch on the catheter tip, the temporary indwelling stent-graft can be smoothly restored into the catheter.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a temporary indwelling stent graft showing an embodiment of the present invention, in which (a) shows a stent and (b) is a stent covered with a graft (temporary indwelling stent graft). (C) shows a state where the temporary indwelling stent graft is stored in the catheter.
FIG. 2 is an explanatory view of a temporary indwelling stent graft showing an embodiment of the present invention, where (a) shows the temporary indwelling stent graft pushed out of the catheter, and (b) shows the stent portion. (C) shows the state in which the graft portion has been turned over with the stent portion almost completely retracted into the catheter, and (d) is inverted. The state which is going to store the graft part of the state in the state in a catheter is shown.
FIG. 3 is an explanatory view showing a state in which a conventional temporary indwelling stent graft is pushed out from a catheter and expanded.
[Explanation of symbols]
  1 Stent
  1a Body
  1b tail
  1c Prop section
  1d tip
  2 Graft
  2a Tip
  3 engaging means
  4 Catheter
  4a Tip
  10 Temporary indwelling stent graft
  W filament

Claims (6)

In a stent in which one or a plurality of filaments are spirally twisted to form a braided structure, and a temporary indwelling stent graft having a graft,
(A) The stent has a diameter-expandable diameter main body portion that expands in a normal state to become a cylindrical shape, a tail portion that expands in a normal state and is tapered following the main body portion, and Consists of a reduced-diameter strut provided subsequent to the tail,
(B) the main body portion of the stent is coated with the graft, and,
(C) The front end of the graft is engaged with the front end of the stent by engagement means so that the front surface and the back surface of the graft can be sequentially rotated from the front end to the rear end of the graft. A temporary indwelling stent graft. The tip of the stent, wrapping filament, two filament ends joining, loop according twisting or the like of the folded portion of the filament is, claim 1 Temporary wherein a is formed at regular intervals Indwelling stent graft.   The temporary indwelling stent graft according to claim 1 or 2, wherein the engaging means is a suture.   The filament is made of a shape memory material, and the shape of the main body of the stent is expanded so as to be cylindrical in a normal state, and the shape of the tail of the stent is stored in a tapered shape in a normal state. 4. The temporary indwelling stent graft according to claim 1, wherein the shape of the support portion of the stent is memorized so as to be in a reduced diameter state.   The temporary indwelling stent graft according to any one of claims 1 to 4, wherein the temporary indwelling stent graft is stored in a pipe-shaped catheter.   6. The temporary indwelling stent graft according to claim 5, wherein a distal end portion of the pipe-shaped catheter is curved so as to spread outward.

Images