JP2024022764A - stent device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stent device suitably compatible with a biological region with bending.

SOLUTION: A stent graft 1 includes: a cylindrical stent extending in an axial direction; and a bending auxiliary member 4 which is brought into contact with the stent on a first contact point 41 at a first end side in the axial direction and a second contact point 42 at a second end side opposite to the first end side of the stent in the axial direction, and in which at least one intermediate point between the first contact point 41 and the second contact point 42 is located at a different position in a circumferential direction of the cylindrical stent from the first contact point 41 and the second contact point 42. The bending auxiliary member 4 is formed in a figure 8 shape having a first ring 41A disposed with the first contact point 41, a second ring 42A disposed with the second contact point 42, and a contact point 45 of the first ring 41A and the second ring 42A constituting an intermediate point, and is arranged along an outer peripheral surface of the cylindrical stent.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to stent devices such as stents and stent grafts.

A self-expanding stent is a medical device that is made of a metal wire woven into a cylindrical shape, or a metal cylindrical material that is cut out in a certain pattern using a laser, etc. It is inserted into a tubular organ in the body, such as the pancreatic duct, to expand the target area. A stent graft is a stent that is covered with a graft around the stent (inner periphery and/or outer periphery), and is used to form a blood flow path at the target site, to connect tubular organs (entrance/exit), and to provide diagnostic and treatment aids. For this purpose, a hole is formed in the body (for example, a hole punctured from the stomach or duodenal bulb to the common bile duct).

Special table 2018-525108 publication

Stents or stent grafts are inserted into various biological parts of the human body, and are sometimes inserted into a curved aorta for treatment of aortic aneurysm or aortic dissection, for example. Patent Document 1 discloses a pre-curved stent graft, but since the degree of curvature differs from body part to body part and/or from person to person, it does not necessarily match the curved shape of the target part.

The present disclosure has been made in view of these circumstances, and an object of the present disclosure is to provide a stent device and the like that can be suitably adapted to curved body parts.

In order to solve the above problems, a stent device according to an aspect of the present disclosure includes a cylindrical stent extending in the axial direction, a first contact point on the first end side of the stent in the axial direction, and a first contact point on the first end side of the stent in the axial direction. A bending auxiliary member that contacts the stent at a second contact point on a second end side opposite to the end side, and at least one intermediate point between the first contact point and the second contact point is in the circumferential direction of the cylindrical stent. A bending auxiliary member whose position is different from that of the first contact point and the second contact point is provided.

Note that the present disclosure also includes arbitrary combinations of the above-mentioned components and conversions of these expressions into methods, devices, systems, recording media, computer programs, and the like.

According to the present disclosure, it is possible to provide a stent device and the like that can be suitably adapted to curved living body parts.

A schematic overview of TEVAR is shown. 1 schematically shows a stent graft according to a first embodiment. 1 schematically shows a stent graft according to a first embodiment in a bent state; 2 schematically shows a stent graft according to a second embodiment. Figure 3 schematically shows a stent graft according to a second embodiment in a bent state; FIG. 7 schematically shows a stent graft according to a first modification in a bent state. FIG. 7 schematically shows a stent graft according to a second modification in a bent state.

Hereinafter, modes for implementing the present disclosure (hereinafter also referred to as embodiments) will be described in detail with reference to the drawings. In the description and/or drawings, the same or equivalent components, members, processes, etc. are denoted by the same reference numerals, and redundant description will be omitted. The scales and shapes of the parts shown in the drawings are set for convenience to simplify the explanation, and should not be interpreted in a limited manner unless otherwise stated. The embodiments are illustrative and do not limit the scope of the present disclosure. Not all features or combinations thereof described in the embodiments are necessarily essential to the present disclosure.

The present disclosure can be applied to stents and stent grafts (hereinafter also collectively referred to as stent devices) that are inserted into any biological site of the human body, but in this embodiment, a bent aorta is used for treatment of aortic aneurysm or aortic dissection. An example of this will be a stent graft that is inserted into a stent graft. Specifically, a stent graft used for stent graft insertion in the thoracic aorta called TEVAR (Thoracic Endovascular Aortic Repair) will be described.

Figure 1 schematically shows an overview of TEVAR. As shown in FIG. 1, the delivery system DS is inserted into the aorta AO in which an aortic aneurysm AN has been formed (see FIG. 1A). The delivery system DS includes a stent graft 1 and an outer sheath for storing the stent graft 1 in a contracted state.

In the state shown in FIG. 1A, the distal end of the delivery system DS guided by the guide wire GW that was previously inserted into the aorta AO has been inserted to the central side (heart side) of the aortic aneurysm AN. The stent graft 1 is positioned at a position where it straddles the aortic aneurysm AN when expanded.

From this state, as shown in FIG. 1B, only the outer sheath is pulled out toward the proximal end (lower side in FIG. 1) without shifting the position of the stent graft 1 inside. When the outer sheath is removed from the stent graft 1, the stent 2 is made of metal or non-metallic wire such as stainless steel or nickel titanium alloy, and the stent 2 is covered with PET (polyethylene terephthalate) or PTFE (polytetraphthalate). A graft 3 made of resin such as fluoroethylene) is deployed together and placed in the aorta AO. As shown in FIG. 1C, the stent graft 1 placed in the aorta AO straddles the aortic aneurysm AN, and the graft 3 forms a blood flow path that directly connects both sides of the aortic aneurysm AN. As a result, the blood in the aorta AO does not flow into the aortic aneurysm AN but instead flows within the graft 3, thereby preventing the aortic aneurysm AN from expanding or rupturing.

In each of the following figures, the stent 2 and the graft 3 are shown as one cylindrical stent graft 1 without distinction. However, the following description regarding stent-graft 1 applies to both stent 2 and graft 3 as far as the context allows. For example, the statement "the bending assisting member is fixed to the outer circumference of the stent graft 1" may be interpreted as "the bending assisting member is fixed to the outer circumference of the stent 2", or "the bending assisting member is fixed to the outer circumference of the stent graft 3". It may be interpreted as "fixed to the outer periphery." Furthermore, when applying the present disclosure to a stent device in which graft 3 is not provided, "stent graft 1" in the following description may be read as "stent 2" (in this case, descriptions that apply only to graft 3 are ignored). ).

FIG. 2 schematically shows the stent graft 1 according to the first embodiment. 2A is a perspective view of the stent graft 1 as viewed from the side, FIG. 2B is a top view of the stent graft 1, and FIG. 2C is a normal line of the axial direction of the cylindrical stent graft 1 (horizontal direction in FIGS. 2A and 2B). FIG. The axial direction, which is the left-right direction in FIGS. 2A and 2B, is the direction in which the cylindrical or tubular stent graft 1 extends. The radial direction of the stent graft 1 is the direction of the radius or diameter passing through the center of the substantially circular cross section of the stent graft 1 in FIG. 2C. The circumferential direction of the stent graft 1 is the circumferential direction of the substantially circular cross section of the stent graft 1 in FIG. 2C.

The stent graft 1 according to the first embodiment is provided with a ring-shaped bending auxiliary member 4 in a top view (FIG. 2B). The bending auxiliary member 4 is formed into a ring shape using an elastic metal or non-metal wire. The material constituting the bending assisting member 4 may be the same as the material constituting the stent 2, or may be different. The ring-shaped bending assisting member 4 has a first contact point 41 on the first end side of the stent graft 1 in the axial direction (the left side or one end side in the axial direction in FIGS. 2A and 2B), and a first contact point 41 on the first end side of the stent graft 1 in the axial direction. It is fixed to the stent graft 1 at a second contact point 42 on the second end side (the right side or the other axial end side in FIGS. 2A and 2B) opposite to the stent graft 1 . The method of fixing the bending assisting member 4 to the stent graft 1 is arbitrary, but for example, the bending assisting member 4 may be fixed to the stent 2 by suturing or gluing, or the bending assisting member 4 may be fixed to the graft 3 by suturing or gluing. It may be fixed, or the bending assisting member 4 may be sandwiched between the stent 2 and the graft 3 and fixed. Note that the bending auxiliary member 4 connects the stent graft 1 (bare stent) with the regions in which the graft 3 is not provided (sometimes called bare stents) at each end of the stent graft 1 in the axial direction as the first contact point 41 and the second contact point 42, respectively. It may be fixed to a stent).

In order to improve the assemblability of the stent graft 1 including the bending assisting member 4, it is preferable to fix the bending assisting member 4 to the stent 2 and the graft 3 that are provided on the outer side in the radial direction. That is, when the stent 2 is provided on the inside in the radial direction and the graft 3 is provided on the outside, it is preferable to fix the bending assisting member 4 to the graft 3, and the graft 3 is provided on the inside in the radial direction and the stent is provided on the outside. 2, it is preferable to fix the bending assisting member 4 to the stent 2 (however, if the inner graft 3 is exposed from the stitches of the outer stent 2, the bending assisting member 4 should be fixed to the stent 2). 3). This also applies to the case where intermediate points 43, 44, etc. of the bending assisting member 4, which will be described later, are fixed to the stent graft 1.

In the illustrated example, the left end (first contact 41) and right end (second contact 42) of the ring-shaped bending auxiliary member 4 are fixed to the stent graft 1. The second contact point 42 does not necessarily have to coincide with the left end and/or the right end of the bending assisting member 4 in the axial direction. For example, although not shown, the first contact 41 on the right side of the left end of the bending assisting member 4 and the second contact 42 on the left side of the right end may serve as fixing points for the stent graft 1. In order to obtain the operation and/or effect of the present embodiment described below, the first contact 41 is located on the first end side (left side) than the second contact 42, and the second contact 42 is located closer than the first contact 41. It is sufficient that intermediate points 43 and 44, which will be described later, are located on the second end side (right side) and are located between the first contact point 41 and the second contact point 42 in the axial direction.

The ring-shaped bending assisting member 4 is arranged along the outer circumferential surface of the cylindrical stent graft 1 . The illustrated first intermediate point 43 and second intermediate point 44 on the bending auxiliary member 4 are the intermediate points in the axial direction of the first contact point 41 and the second contact point 42, respectively. However, the first intermediate point 43 and/or the second intermediate point 44 only need to be between the first contact point 41 and the second contact point 42 in the axial direction, and do not necessarily have to be the midpoint between them. In the illustrated example, of the first intermediate point 43 and the second intermediate point 44, only the first intermediate point 43 is fixed to the stent graft 1 (the second intermediate point 44 is not fixed to the stent graft 1 and is therefore indicated by a dotted line). ). In this way, the ring-shaped bending assisting member 4 fixes the stent graft 1 at at least three fixing points: the first contact point 41 on the first end side, the second contact point 42 on the second end side, and the first intermediate point 43 therebetween. Fixed. In addition to these fixation points, the second intermediate point 44 may also be a fixation point for the stent-graft 1.

As shown in FIG. 2C, the first intermediate point 43 and the second intermediate point 44 of the bending auxiliary member 4 have different positions in the circumferential direction from the first contact point 41 and the second contact point 42. In the illustrated example, the circumferential (and radial) positions of the first contact 41 and the second contact 42 are the same, but they may be different. Even in this case, the first intermediate point 43 and/or the second intermediate point 44 are provided at different circumferential positions from the first contact 41 and the second contact 42, respectively. Furthermore, in the illustrated example, when the first contact point 41 and/or the second contact point 42 are assumed to be the North Pole of the earth, the first intermediate point 43 and the second intermediate point 44 are located in the northern hemisphere. The first waypoint 43 and the second waypoint 44 may be located in the southern hemisphere or on the equator.

In the bending assisting member 4 when the stent graft 1 as described above is in the extended state shown in FIG. In a side cross-sectional view, the straight line in the axial direction connecting the first contact point 41 and the second contact point 42 does not pass near the first intermediate point 43 and the second intermediate point 44 . That is, as shown in FIG. 2A in a substantially side view, the first intermediate point 43 (and the second intermediate point 44) deviates significantly from the straight line in the axial direction connecting the first contact point 41 and the second contact point 42. It is in the same position. In other words, the ring-shaped bending assisting member 4 is attached to the stent graft 1 in the extended state in a curved or bent state at the first intermediate point 43 or the like.

The bending auxiliary member 4 curved or bent in this manner aligns the first contact point 41, the first intermediate point 43 (and the second intermediate point 44), and the second contact point 42 on approximately a straight line in the approximate side view of FIG. 2A. generate an elastic force to In this way, the stent graft 1 inserted into a curved body part such as the aorta AO can be easily bent by the bending assisting member 4 having elasticity that tends to "extend" from the curved or bent state in FIG. 2A.

FIG. 3 schematically shows the stent graft 1 according to the first embodiment in a bent state. In the bending assisting member 4 in this case, the first contact point 41, the first intermediate point 43 (and the second intermediate point 44), and the second contact point 42 are connected to each other due to the elasticity in a substantially side view (the axis of the stent graft 1 and the first contact point 41 and a side sectional view of a cross section including the second contact 42), they are aligned substantially in a straight line (in other words, they are arranged substantially on the same plane) in FIG. In this way, when the stent graft 1 which was in the stretched state in FIG. 2A is inserted into a bent living body part such as the aorta AO and becomes bent as shown in FIG. 3, the bending assisting member which was in the bent state in FIG. 2A 4 actively or spontaneously restores to the stretched state as shown in FIG. 3 due to elasticity. Therefore, the stent graft 1 can naturally bend or curve to follow or closely adhere to a curved body part such as the aorta AO due to the elasticity of the bending assisting member 4 to return to the extended state (FIG. 3). As a result, in Figure 1C, the gap (also called a bird's beak) that tends to be formed between the inner side of the stent graft 1 with a large curvature (left side in Figure 1C) and the wall of the aorta AO or aneurysm AN can be effectively eliminated. It can be suppressed.

Further, by providing the bending assisting member 4, which is a ring-shaped elastic member, the stent graft 1 becomes strong against lateral forces perpendicular to the paper plane of FIG. That is, even if a crushing force is applied to the stent graft 1 from the side, the ring-shaped bending assisting member 4 generates an elastic force that resists the force, making the stent graft 1 less likely to be crushed. Therefore, for example, blood flow within the flow path formed by the graft 3 can be maintained normally.

Furthermore, the bending assisting member 4 as in this embodiment can be easily added without adversely affecting the characteristics of the existing stent graft 1. Further, since the type and specifications of the stent graft 1 to be added are not concerned, the bending assisting member 4 can be prepared as a common component with extremely high versatility.

FIG. 4 schematically shows a stent graft 1 according to a second embodiment. Components similar to those in the first embodiment are given the same reference numerals and redundant explanations will be omitted. FIG. 4A is a perspective view of the stent graft 1 as viewed from the side, FIG. 4B is a top view of the stent graft 1, and FIG. 4C is a normal line of the axial direction (horizontal direction in FIGS. 4A and 4B) of the cylindrical stent graft 1. FIG.

The stent graft 1 according to the second embodiment is provided with a bending assisting member 4 having a figure-8 shape (or "∞" shape) when viewed from above (FIG. 4B). The figure-8 shaped bending auxiliary member 4 includes a first ring 41A in which a first contact 41 is provided, a second ring 42A in which a second contact 42 is provided, and a first ring 41A and a second ring that constitute an intermediate point. 42A of connection points 45, which are arranged along the outer peripheral surface of the cylindrical stent graft 1. As shown in FIG. 4A, when attaching the bending assisting member 4 to the stent graft 1, the cylindrical or tubular stent graft 1 is attached to the first ring 41A and the second ring 42A of the figure-8 shaped bending assisting member 4. inserted in the direction. Then, at least the connection point 45 between the first ring 41A and the second ring 42A in the figure 8 shape of the bending assisting member 4 is fixed to the stent graft 1. In addition to or instead of the connection point 45, the bending aid 4 may be fixed to the stent graft 1 at a first contact point 41 and/or a second contact point 42, similar to the first embodiment of FIG. The figure-8-shaped bending assisting member 4 may be formed, for example, by twisting the ring-shaped bending assisting member 4 similar to the first embodiment (FIGS. 2 and 3), or may be formed by twisting the ring-shaped bending assisting member 4 from the beginning. The first ring 41A and the second ring 42B may be integrally formed so as to have the same shape, or the first ring 41A and the second ring 42B which are formed separately may be combined. .

If the three points of the first contact 41, the second contact 42, and the connection point 45 are fixed points, at approximately both ends (the first contact 41 and the second contact 42) and approximately at the center (the connection point 45) of the figure-8 shape, , the bending assisting member 4 can be securely fixed to the stent graft 1. As a result, the elastic force of the bending assisting member 4 that promotes bending of the stent graft 1, which will be described later with reference to FIG. 5, can be effectively applied to the stent graft 1. On the other hand, if it is desired to minimize the number of fixed points, only one connection point 45 may be used as the fixed point. Since the first ring 41A and the second ring 42A surround the outer peripheral surface of the cylindrical stent graft 1 on both sides of the connection point 45 in the axial direction, the first contact point 41 and/or the second contact point 42 need not be fixed points. Also, the bending assisting member 4 can be fixed to the outer peripheral surface of the stent graft 1. As described above, the bending assisting member 4 according to the present disclosure may be fixed to the outer circumferential surface of the stent graft 1 at at least one of the first contact point 41, the second contact point 42, and the intermediate point (connection point 45, etc.).

As shown in FIG. 4C, the connection point 45, which is the middle point of the figure-8 shaped bending auxiliary member 4, has a different position in the circumferential direction from the first contact point 41 and the second contact point 42. In the illustrated example, when the first contact point 41 and/or the second contact point 42 are assumed to be the North Pole of the earth, the connection point 45 is located at the South Pole, but the connection point 45 is located at a location other than the North Pole and the South Pole. It may be located in the southern hemisphere, on the equator, or in the northern hemisphere.

In the bending assisting member 4 when the stent graft 1 as described above is in the extended state shown in FIG. In the side cross-sectional view, the straight line in the axial direction connecting the first contact point 41 and the second contact point 42 does not pass near the connection point 45. That is, as shown in FIG. 4A in a substantially side view, the connection point 45 is located at a position significantly deviated from the straight line in the axial direction connecting the first contact 41 and the second contact 42. In other words, the figure-8 shaped bending assisting member 4 is attached to the stent graft 1 in the expanded state in a curved or bent state at the connection point 45 or the like.

The bending auxiliary member 4 curved or bent in this manner generates an elastic force that tends to align the first contact 41, the connection point 45, and the second contact 42 substantially in a straight line in a substantially side view in FIG. 4A. In this way, the stent graft 1 inserted into a curved biological site such as the aorta AO can be easily bent by the bending assisting member 4 having elasticity that tends to "extend" from the curved or bent state in FIG. 4A. In particular, in the figure-8 shaped bending assisting member 4 according to the present embodiment, the connection point 45 at the substantially center in the axial direction serves as a fulcrum, and the first ring 41A and the second ring 42A on both sides are effectively brought into an extended state. be returned.

FIG. 5 schematically shows the stent graft 1 according to the second embodiment in a bent state. In this case, in the bending assisting member 4, the first contact 41, the connection point 45, and the second contact 42 are formed due to the elasticity of the bending auxiliary member 4. In FIG. 5 (cross-sectional view), they are aligned substantially in a straight line (in other words, they are arranged substantially on the same plane). In this way, when the stent graft 1 which was in the stretched state in FIG. 4A is inserted into a bent living body part such as the aorta AO and becomes bent as shown in FIG. 5, the bending assisting member which was in the bent state in FIG. 4A 4 actively or spontaneously restores to the stretched state as shown in FIG. 5 due to elasticity. Therefore, the stent graft 1 can naturally bend or curve to follow or closely adhere to a curved body part such as the aorta AO due to the elasticity of the bending assisting member 4 to return to the stretched state (FIG. 5).

Furthermore, by providing the bending auxiliary member 4, which is a figure-8 shaped elastic member having the first ring 41A and the second ring 42A, the stent graft 1 becomes strong against lateral forces perpendicular to the paper plane of FIG. . That is, even if a crushing force is applied to the stent graft 1 from the side, the first ring 41A and the second ring 42A in the bending assisting member 4 generate elastic force to resist the force, so the stent graft 1 is less likely to be crushed.

Furthermore, the bending assisting member 4 as in this embodiment can be easily added without adversely affecting the characteristics of the existing stent graft 1. Further, since the type and specifications of the stent graft 1 to be added are not concerned, the bending assisting member 4 can be prepared as a common component with extremely high versatility.

The present disclosure has been described above based on the embodiments. It will be obvious to those skilled in the art that various modifications can be made to the combinations of components and processes in the exemplary embodiments, and such modifications are within the scope of the present disclosure.

In the first embodiment and the second embodiment, the bending auxiliary member 4 was formed in a ring shape or a figure 8 shape, but the bending auxiliary member 4 may have other shapes such as a plate shape, a C shape, or an S shape. may be formed. For example, the ring-shaped bending auxiliary member 4 in the first embodiment (FIGS. 2 and 3) may be broken or disconnected at one or more locations. The bending assisting member 4 in this case is constituted by one or more C-shaped sub-bending assisting members. Preferably, both ends of each sub-bending assisting member, each C-shaped, are fixed to the stent 2 and/or the graft 3. Further, by omitting a part of the 8-shaped bending auxiliary member 4 in the second embodiment (FIGS. 4 and 5), it may be formed into an S-shape. Preferably, both ends of the S-shaped bending assisting member 4 are fixed to the stent 2 and/or the graft 3.

FIG. 6 schematically shows the stent graft 1 according to the first modification in a bent state. The stent graft 1 is provided with a plurality of ring-shaped (three in the example of FIG. 6) bending assisting members 4A, 4B, and 4C along the axial direction when viewed from above. As in the illustrated example, the axially adjacent bending auxiliary members 4A, 4B, and 4C may overlap at least partially in the axial direction, or may be spaced apart from each other in the axial direction.

Although not shown, the ring-shaped bending auxiliary members 4A, 4B, and 4C are attached to the stent graft 1 in the extended state in a curved or bent state, similar to FIG. 2 in the first embodiment. Each of these bending assisting members 4A, 4B, and 4C has a substantially planar shape due to its elasticity in the bent state of the stent graft 1 shown in FIG. Therefore, the stent graft 1 naturally bends or curves to follow or closely adhere to a curved body part such as the aorta AO due to the elasticity of each of the bending assisting members 4A, 4B, and 4C to return to the stretched state (FIG. 6). can. Particularly in this modification, by providing a plurality of bending assisting members 4A, 4B, and 4C along the axial direction, the bendability of the stent graft 1 at each position and/or range in the axial direction can be flexibly adjusted. Furthermore, although not shown, the flexibility of the stent graft 1 at each position and/or range in the circumferential direction may be adjusted by providing a plurality of bending assisting members 4 along the circumferential direction.

FIG. 7 schematically shows the stent graft 1 according to the second modification in a bent state. As in this modification, the ring-shaped bending auxiliary member 4 may include a meandering portion 4D or a zigzag portion 4E.

Note that the configuration, operation, and function of each device and each method described in the embodiments can be realized by hardware resources, software resources, or by cooperation of hardware resources and software resources. As hardware resources, for example, a processor, ROM, RAM, and various integrated circuits can be used. As software resources, for example, programs such as operating systems and applications can be used.

Reference Signs List 1 stent graft, 2 stent, 3 graft, 4 bending auxiliary member, 41 first contact, 41A first ring, 42 second contact, 42A second ring, 43 intermediate point, 45 connection point.

Claims (12)

a cylindrical stent extending in the axial direction;
A bending assisting member that contacts the stent at a first contact point on a first end side of the stent in the axial direction and a second contact point on a second end side opposite to the first end side of the stent in the axial direction. At least one intermediate point between the first contact point and the second contact point is a bending assisting member whose position in the circumferential direction of the cylindrical stent is different from that of the first contact point and the second contact point;
A stent device comprising: 2. The stent device of claim 1, wherein the intermediate point of the bending assisting member is fixed to the stent, and the circumferential position is different from the first contact and the second contact. The bending auxiliary member includes a first ring in which the first contact is provided, a second ring in which the second contact is provided, and a connection point between the first ring and the second ring that constitutes the intermediate point. The stent device according to claim 1 or 2, wherein the stent device is formed in a figure 8 shape and is arranged along the outer peripheral surface of the cylindrical stent. The stent device according to claim 3, wherein the stent is inserted in the axial direction through the first ring and the second ring in the figure eight shape of the bending assisting member. 5. The stent device according to claim 4, wherein the connection point of the first ring and the second ring in the figure eight shape of the bending assisting member is fixed to the stent. In a cross-sectional view of a cross section including the axis of the cylindrical stent and at least one of the first contact point and the second contact point, the bending auxiliary member has the first contact point, the intermediate point, and the second contact point. 3. The stent device according to claim 1, wherein the stent device has elasticity to tend to align the stent in substantially a straight line. The stent according to claim 6, wherein in the bending assisting member when the stent is in a bent state, the first contact point, the intermediate point, and the second contact point are aligned substantially in a straight line in the cross-sectional view due to the elasticity. device. 8. The stent device according to claim 7, wherein in the bending assisting member when the stent is in an extended state, a straight line connecting the first contact point and the second contact point does not pass near the intermediate point in the cross-sectional view. The stent device according to claim 1 or 2, wherein the bending assisting member is fixed to the outer peripheral surface of the stent at at least one of the first contact point, the second contact point, and the intermediate point. further comprising a graft covering the inner circumference and/or outer circumference of at least a portion of the stent,
The bending assisting member is fixed to the graft at at least one of the first contact point, the second contact point, and the intermediate point.
A stent device according to claim 1 or 2. The stent device according to claim 1 or 2, wherein the bending assisting member is formed in a ring shape and is arranged along the outer peripheral surface of the cylindrical stent. The stent device according to claim 1 or 2, wherein a plurality of the bending assisting members are provided along the axial direction.

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