Stent and method for manufacturing the stent

Abstract

To provide a stent capable of increasing a degree of freedom in designing.SOLUTION: A stent includes: a first cylindrical part 12; and a radial direction extending part 14 connected to an outer end part of the first cylindrical part 12 and extending in a radial direction outer side from the outer end part. The first cylindrical part 12 and the radial direction extending part 14 are constituted by different members from each other. The stent includes a second cylindrical part 16 provided on an axial direction outer side with respect to the first cylindrical part 12 and having a larger outer diameter than the first cylindrical part 12. The radial direction extending part 14 and the second cylindrical part 16 may be constituted by different members from each other.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This disclosure relates to a stent.

Background Art

[0002] Patent Document 1 discloses a stent to be placed in a luminal organ. This stent includes a cylindrical portion and a radially extending portion that is connected to the outer end of the cylindrical portion and is provided to extend radially outward from the outer end. By hooking the radially extending portion of this stent on a stenosis of a luminal organ or the like, the position retention of the stent in the body can be enhanced.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The stent of Patent Document 1 is composed of a wire material in which the cylindrical portion and the radially extending portion are continuous. The inventor of the present application has recognized that there is room for improvement regarding the disclosed technology of Patent Document 1 in order to increase the degree of freedom in the design of the stent.

[0005] One object of this disclosure is to provide a stent that can increase the degree of freedom in design.

Means for Solving the Problems

[0006] The stent of this disclosure includes a first cylindrical portion and a radially extending portion that is connected to the outer end of the first cylindrical portion and is provided to extend radially outward from the outer end, and the first cylindrical portion and the radially extending portion are constituted by separate members from each other.

[0007] Other stents of the present disclosure include a first cylindrical portion and a radially extending portion connected to an outer end portion of the first cylindrical portion and provided to extend radially outward from the outer end portion. The radially extending portion includes a plurality of first connecting portions that are separably connected to respective ones of a plurality of first connected portions provided at the outer end portion. Among the plurality of first connecting portions, the number of first connecting portions formed of a wire continuous with the first connected portion of the mating part is two or less, and the rest are formed of first hook portions connected to the first connected portion by hooking.

[0008] A method for manufacturing a stent of the present disclosure includes a first cylindrical portion and a radially extending portion connected to an outer end portion of the first cylindrical portion and provided to extend radially outward from the outer end portion. The first cylindrical portion and the radially extending portion are formed of separate members. The method includes a connecting step of connecting the radially extending portion to the outer end portion of the first cylindrical portion.

Effects of the Invention

[0009] According to the present disclosure, it is possible to provide a stent that can increase the degree of freedom in design.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying out the Invention

[0011] (First Embodiment) Hereinafter, embodiments for implementing the stent of the present disclosure will be described. The same or equivalent elements are denoted by the same reference numerals, and redundant descriptions are omitted. In each drawing, for convenience of explanation, components are appropriately omitted, enlarged, or reduced. The drawings are to be viewed in accordance with the orientation of the reference numerals.

[0012] Refer to FIG. 1. In this specification, the direction along the center line of the stent 10 is referred to as the axial direction, and the radial direction and the circumferential direction centered on the center line are simply referred to as the radial direction and the circumferential direction. Also, in this specification, there may be references to the outside and inside in the axial direction, and the outside and inside in the radial direction. The outside in the axial direction refers to the side that is axially away from the axial center position of the stent 10, and the inside in the axial direction refers to the side that approaches the axial center position axially. The outside in the radial direction refers to the side that is radially away from the center line of the stent 10, and the inside in the radial direction refers to the side that approaches the center line radially.

[0013] The stent 10 is implanted into a luminal organ in the body for the treatment of vascular dissection, tumors, and other conditions such as gastrointestinal obstruction. Here, the luminal organ refers to, for example, blood vessels, the digestive tract, etc. The stent 10 is transported to the target position in the luminal organ by a delivery device. At this time, the stent 10 is held by the delivery device in a state where the entire stent 10 is contracted while being stretched axially. The stent 10 of the present embodiment will be described as an example of a bare stent used without a covering. In addition to this, the stent 10 may be used in combination with other components. For example, the stent 10 may be used as a stent graft combined with a graft, or as a covered stent combined with a cover.

[0014] The stent 10 includes a small-diameter cylindrical portion 12 (first cylindrical portion) and a radially extending portion 14 connected to the outer end portion 12a of the small-diameter cylindrical portion 12. In addition to this, the stent 10 includes a large-diameter cylindrical portion 16 (second cylindrical portion) disposed axially outside the small-diameter cylindrical portion 12 and having an outer diameter larger than that of the small-diameter cylindrical portion 12. The radially extending portion 14 is connected to the inner end portion 16a of the large-diameter cylindrical portion 16. Assume a first direction (for example, the direction perpendicular to the paper surface of FIG. 1) perpendicular to the axial direction of the stent 10 and a second direction (for example, the left-right direction of the paper surface of FIG. 1) perpendicular to the axial direction and the first direction. In order to satisfy the condition of "the large-diameter cylindrical portion 16 having an outer diameter larger than that of the small-diameter cylindrical portion 12" here, when viewed from the first direction, with respect to the outer diameter in the second direction, it is sufficient that the outer diameter R16 of the large-diameter cylindrical portion 16 is larger than the outer diameter R12 of the small-diameter cylindrical portion 12. In this embodiment, this condition is satisfied when viewed from all directions perpendicular to the axial direction of the stent 10, but it is sufficient that it is satisfied when viewed from any one of these all directions. Also, in order to satisfy this condition, when viewed from the first direction, if the outer diameter in the second direction changes in the axial direction, it is sufficient that the minimum outer diameter of the large-diameter cylindrical portion 16 is larger than the minimum outer diameter of the small-diameter cylindrical portion 12.

[0015] Each of the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 is configured to form a cylindrical shape as a whole using at least one wire. In order to achieve this, each of the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 of the present embodiment is constituted by a mesh structure body in which a plurality or a single wire is knitted into a mesh and a cylindrical shape. A specific example for realizing this is not limited to this. For example, in addition to this, the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 may be constituted by a strut structure body using a plurality of struts (wires) forming a cylindrical shape. In this case, the strut structure may include, for example, a plurality of annular struts arranged in the axial direction and a link connecting adjacent struts. In the present embodiment, each of the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 extends straight in the axial direction as a whole.

[0016] The radially extending portion 14 is provided so as to extend radially outward from the outer end portion 12a of the small-diameter cylindrical portion 12. This condition is satisfied in this embodiment when viewed from all directions orthogonal to the axial direction of the stent 10, but it suffices if it is satisfied when viewed from any one of those all directions. The radially extending portion 14 of this embodiment has a flange shape extending along the radial direction from the outer end portion 12a of the small-diameter cylindrical portion 12. In this case, when the radially extending portion 14 is viewed from the radial direction of the stent 10, the angle formed with respect to the axial direction of the stent 10 is 90 degrees. However, it is not limited to this, and the radially extending portion 14 may have a tapered shape extending obliquely radially outward and axially outward from the outer end portion 12a of the small-diameter cylindrical portion 12. In this case, when the radially extending portion 14 is viewed at least from the aforementioned first direction of the stent 10, the angle formed with respect to the axial direction of the stent 10 is not particularly limited, and may be, for example, 45 degrees or the like.

[0017] The stent 10 of this embodiment is a self-expanding type stent that can expand radially outward by self-expansion. Here, self-expansion means expanding by the restoring force accompanying its own elastic deformation. In order to satisfy this condition, each of the small-diameter cylindrical portion 12, the radially extending portion 14, and the large-diameter cylindrical portion 16 can expand by self-expansion. In this embodiment, these are constituted by a wire material using a metal such as a shape memory alloy or stainless steel, as well as a resin or the like. In addition to this, the stent 10 may also be a balloon-expandable type stent that can be expanded by a balloon.

[0018] Refer to FIGS. 2(A), 2(B), 3, and 4. In FIG. 2(B), a state where the connecting wire 18A (described later) constituting the radially extending portion 14 in FIG. 2(A) is not connected by the sleeve 24 is shown. FIG. 3 is a photograph of the stent 10 having the same structure as that of the first embodiment viewed from the arrow III in FIG. 1. In FIG. 4, in addition to the radially extending portion 14, the positions of the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 are indicated by a two-dot chain line.

[0019] The radially extending portion 14 includes at least one (only one in this embodiment) connecting wire 18A that extends in a wavy manner in the circumferential direction. The connecting wire 18A is provided such that the inner circumferential peaks 20 and the outer circumferential peaks 22 alternate with each other in the circumferential direction. The inner circumferential peaks 20 protrude radially inward, and the outer circumferential peaks 22 protrude radially outward. Each of both ends of the connecting wire 18A is connected to each other. To achieve this, for example, by caulking the ends of the connecting wire 18A passed through the sleeve 24, the ends of the connecting wire 18A are fixed to the sleeve 24, and the sleeve 24 connects each of both ends of the connecting wire 18A to each other.

[0020] The connecting wire 18A does not have an overlap portion that overlaps with a part of itself or another wire along the wire length direction of the connecting wire 18A at locations other than both ends of the connecting wire 18A. Here, the wire length direction refers to the direction (axial direction) along the line formed by the connecting wire 18A. The aforementioned sleeves 24 are fixed to both ends of the connecting wire 18A. At locations other than the sleeves 24, the radially extending portion 14 is constituted only by the connecting wire 18A without forming an overlap portion. Thereby, compared with the case where an overlap portion is formed in a part of the connecting wire 18A, the deformation behavior of the connecting wire 18A in the circumferential direction becomes uniform, which is advantageous for improving the operating stability when deploying the stent 10.

[0021] The above-mentioned small-diameter cylindrical portion 12 and the radially extending portion 14 are constituted by separate members. Thereby, the structure such as the wire diameter and the knitting method can be changed between the small-diameter cylindrical portion 12 and the radially extending portion 14. Therefore, the degree of freedom in design can be increased compared with the case where the small-diameter cylindrical portion 12 and the radially extending portion 14 are constituted by a continuous wire.

[0022] Also, the radially extending portion 14 and the large-diameter cylindrical portion 16 are constituted by separate members. Thereby, the structure such as the wire diameter and the knitting method can be changed between the radially extending portion 14 and the large-diameter cylindrical portion 16. Therefore, the degree of freedom in design can be increased compared with the case where the large-diameter cylindrical portion 16 and the radially extending portion 14 are constituted by a continuous wire.

[0023] Also, when the large-diameter cylindrical portion 16 is connected to the radially extending portion 14, the large-diameter cylindrical portion 16 can be brought into contact with the inner cavity surface of the tubular organ in the vicinity of the outer peripheral end portion (the outer peripheral side peak portion 22) of the radially extending portion 14. As a result, there is an advantage that the expansion force acting on the inner cavity surface from the stent 10 around the outer peripheral end portion of the radially extending portion 14 can be dispersed by the large-diameter cylindrical portion 16.

[0024] A plurality of first peak portions 26 to which the first hook portion 38 of the radially extending portion 14 described later is connected are provided at the outer end portion 12a of the small-diameter cylindrical portion 12. The first peak portion 26 is an example of a first connected portion 28 to which the first hook portion 38 is connected. The plurality of first peak portions 26 are arranged in the circumferential direction and protrude toward the outer side in the axial direction. The small-diameter cylindrical portion 12 is composed of a net-like structure including the plurality of first peak portions 26. Each first peak portion 26 forms a plurality of first openings 30 that penetrate the small-diameter cylindrical portion 12 in the radial direction. The first opening 30 is formed as a mesh, for example, by a part of the wire forming the first peak portion 26 and another part of the wire.

[0025] A plurality of second peak portions 32 to which the second hook portion 40 of the radially extending portion 14 described later is connected are provided at the inner end portion 16a of the large-diameter cylindrical portion 16. The second peak portion 32 is an example of a second connected portion 34 to which the second hook portion 40 is connected. The plurality of second peak portions 32 are arranged in the circumferential direction and protrude toward the inner side in the axial direction. The large-diameter cylindrical portion 16 is composed of a net-like structure including the plurality of second peak portions 32. Each second peak portion 32 forms a plurality of second openings 36 that penetrate the large-diameter cylindrical portion 16 in the radial direction. The second opening 36 is formed as a mesh, for example, by a part of the wire forming the second peak portion 32 and another part of the wire.

[0026] Refer to FIGS. 3 and 4. The radially extending portion 14 includes a plurality of first hook portions 38 each connected to a respective one of the plurality of first peak portions 26 of the small-diameter cylindrical portion 12, and a plurality of second hook portions 40 each connected to a respective one of the plurality of second peak portions 32 of the large-diameter cylindrical portion 16. In FIGS. 3 and 4, circles are marked at the contact locations of the first hook portions 38 with the first peak portions 26, and squares are marked at the contact locations of the second hook portions 40 with the second peak portions 32. In the connecting wire 18A of the present embodiment, the first hook portions 38 and the second hook portions 40 are provided alternately in the circumferential direction.

[0027] The first hook portion 38 is an example of a first connecting portion 42 connected to the first peak portion 26 (first connected portion 28), and is connected to the first peak portion 26 by being hooked. The first hook portion 38 is constituted by the inner circumferential side peak portion 20 of the radially extending portion 14. The first hook portion 38 is hooked on the first peak portion 26 without being spirally wound around the first peak portion 26. In the present embodiment, there are a total of 14 first peak portions 26, and an example is shown in which a total of 14 corresponding first hook portions 38 are located at the positions of circles A1 to A14.

[0028] The second hook portion 40 is an example of a second connecting portion 44 connected to the second peak portion 32 (second connected portion 34), and is connected to the second peak portion 32 by being hooked. The second hook portion 40 is constituted by the outer circumferential side peak portion 22 of the radially extending portion 14. The second hook portion 40 is hooked on the second peak portion 32 without being spirally wound around the second peak portion 32. In the present embodiment, there are a total of 14 second peak portions 32, and an example is shown in which a total of 14 corresponding second hook portions 40 are located at the positions of squares B1 to B14.

[0029] The radially extending portion 14 is connected to the outer end portion 12a of the small-diameter cylindrical portion 12 only by a plurality of first hook portions 38. Also, the radially extending portion 14 is connected to the inner end portion 16a of the large-diameter cylindrical portion 16 only by a plurality of second hook portions 40. By being connected to each of the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16, the radially extending portion 14 joins the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 together.

[0030] Refer to FIG. 5. Each first hook portion 38 of the radially extending portion 14 is connected to the first ridge portion 26 of the small-diameter cylindrical portion 12 of the mating part in a manner that prevents separation. This means that when the first hook portion 38 attempts to move relative to the first ridge portion 26, separation can be prevented by the contact between the two. In this embodiment, for example, when the first hook portion 38 attempts to move relative to the first ridge portion 26 radially outward Da1 and axially outward (the front side of the paper in FIG. 5), its detachment is prevented. Here, "relative movement" means the relative movement of the two mentioned entities (here, the first ridge portion 26 and the first hook portion 38).

[0031] Each first hook portion 38 is not connected by a continuous portion to the first ridge portion 26 of the mating part. Here, the continuous portion includes, in addition to the continuous portion of the same member, the joined portion in two members joined by welding or the like. The first ridge portion 26 and the first hook portion 38 that are connected to each other are separated as separate bodies, and relative movement between the two is allowed. The first hook portion 38 of this embodiment allows relative movement at least in the radial direction with respect to the first ridge portion 26. Specifically, when the stent 10 is in the maximum expansion state (described later), the first hook portion 38 allows relative movement in the radially inward Da2 direction with respect to the first ridge portion 26. In addition to this, when the stent 10 is in the maximum expansion state, the first hook portion 38 allows relative movement in the axially inward (the back side of the paper in FIG. 5) and both circumferential directions with respect to the first ridge portion 26. When the relative movement amount of the first hook portion 38 with respect to the first ridge portion 26 in the direction where relative movement is allowed becomes large, part of the radially extending portion 14 and the small-diameter cylindrical portion 12 hit each other, and its movement is restricted.

[0032] Each second hook portion 40 of the radially extending portion 14 is connected to the second ridge portion 32 of the large-diameter cylindrical portion 16 of the mating part in a manner that prevents separation. This means that, as described above, when the second ridge portion 32 attempts to move relative to the second hook portion 40, separation can be prevented by the contact between the two. In this embodiment, for example, when the second ridge portion 32 attempts to move relative to the second hook portion 40 radially outward Da1 and axially outward (the front side of the paper in FIG. 5), its detachment is prevented.

[0033] Each second hook portion 40 of the radially extending portion 14 is not connected by a continuous portion to the second peak portion 32 of the mating part. The definition of the continuous portion here is the same as described above. The second peak portion 32 and the second hook portion 40 that are connected to each other are separated from each other, and relative movement between the two is allowed. The second peak portion 32 of the present embodiment allows relative movement with respect to the second hook portion 40 in the radially inner side Dc2, the axially inner side (the back side of the paper in FIG. 5), and both circumferential sides when the stent 10 is in the maximum expansion state. When the relative movement amount of the second peak portion 32 with respect to the second hook portion 40 in the direction where relative movement is allowed becomes large, a part of the radially extending portion 14 and the large-diameter cylindrical portion 16 contact each other, and the movement is restricted.

[0034] The "maximum expansion state" of the stent 10 described above means, in the case of a self-expanding stent, the state in which the stent 10 expands to the maximum without applying an external force for contracting the stent 10. In the case of a balloon-expandable stent, usually, the maximum expanded outer diameter of the stent 10 is described as the manufacturer's nominal value in the attached document of the medical device. In this case, the state in which the stent 10 is expanded by the balloon to this nominal value is called the maximum expansion state.

[0035] The effects of the stent 10 of the embodiment will be described. Refer to Fig. 6(A). First, the stent 100 of the reference embodiment will be described. Here, for the sake of convenience of explanation, a view is shown in which the wire 102 constituting each cylindrical portion 12, 16 and the radially extending portion 14 of the stent 100 extends straight in the plane along the axial direction. In reality, this wire 102 extends in a wavy or spiral shape so as to form a continuous network structure in the cylindrical portions 12, 16 and the radially extending portion 14 of the stent 10. In this case, it can be considered that the first connected portion 28 of the small-diameter cylindrical portion 12 and the first connecting portion 42 of the radially extending portion 14, which are connected to each other, are connected by a continuous wire. In this case, at the boundary between the first connected portion 28 of the small-diameter cylindrical portion 12 and the first connecting portion 42 of the radially extending portion 14, an inner bent portion 104 is provided which bends so as to protrude inward in the radial direction. Also, in this case, it can be considered that the second connected portion 34 of the large-diameter cylindrical portion 16 and the second connecting portion 44 of the radially extending portion 14, which are connected to each other, are connected by a continuous wire. In this case, at the boundary between the second connected portion 34 of the large-diameter cylindrical portion 16 and the second connecting portion 44 of the radially extending portion 14, an outer bent portion 106 is provided which bends so as to protrude outward in the radial direction.

[0036] Refer to Fig. 6(B). As described above, when the stent is incorporated into the delivery device, the entire stent is contracted while being stretched in the axial direction. At this time, in the radially extending portion 14 of the stent, a tilting deformation occurs in the direction De (see Fig. 6(A)) such that the angle with respect to the axial direction is reduced while contracting inward in the radial direction.

[0037] In the stent 100 of the reference configuration, the first connected portion 28 of the small-diameter cylindrical portion 12 and the first connection portion 42 of the radially extending portion 14 are connected by a continuous wire. In this case, when the radially extending portion 14 is tilted and deformed, in order to maintain the original bent state as much as possible at the inner bending portion 104 at the boundary between the two, the portion around the boundary between the two resists. For this reason, following the tilting deformation of the first connection portion 42 of the radially extending portion 14, the first connected portion 28 of the small-diameter cylindrical portion 12 is likely to be bent and deformed radially inward. As a result, the small-diameter cylindrical portion 12 is likely to have a distorted shape in which it is partially contracted around the boundary (inner bending portion 104) between the radially extending portion 14 and the small-diameter cylindrical portion 12.

[0038] Also, in the stent 100 of the reference configuration, the second connected portion 34 of the large-diameter cylindrical portion 16 and the second connection portion 44 of the radially extending portion 14 are connected by a continuous wire. Therefore, when the radially extending portion 14 is tilted and deformed, in order to maintain the original bent state as much as possible at the outer bending portion 106 at the boundary between the two, the portion around the boundary between the two resists. For this reason, following the tilting deformation of the second connection portion 44 of the radially extending portion 14, the second connected portion 34 of the large-diameter cylindrical portion 16 is likely to be bent and deformed radially outward. As a result, the portion around the boundary (outer bending portion 106) between the radially extending portion 14 and the large-diameter cylindrical portion 16 is likely to have a distorted shape in which it is partially expanded. These tendencies are more likely to be manifested as the angle of the radially extending portion 14 with respect to the axial direction increases.

[0039] Refer to FIGS. 6(C) and 6(D). Also in FIG. 6(C), for convenience of explanation, an example is shown in which the wires constituting the respective cylindrical portions 12 and 16 and the radially extending portion 14 of the stent 10 extend straight in a plane along the axial direction.

[0040] (A) Each of the plurality of first hook portions 38 (first connection portions 42) of the present embodiment is not connected by a continuous portion to the first ridge portion 26 (first connected portion 28) of the mating partner. Therefore, as described above, when the entire stent 10 is stretched in the axial direction and the radially extending portion 14 is deformed by falling, compared with the reference embodiment, the portion around the boundary portion (contact portion) between the first hook portion 38 and the first ridge portion 26 that are connected to each other is easily deformed freely without resistance. For this reason, it becomes difficult for the first ridge portion 26 to be bent and deformed radially inward following the deformation by falling of the first hook portion 38 of the radially extending portion 14. As a result, the small-diameter cylindrical portion 12 does not become a shape in which the small-diameter cylindrical portion 12 is partially contracted around the boundary portion between the radially extending portion 14 and the small-diameter cylindrical portion 12, and it becomes easy to make the shape as straight as possible in the axial direction. That is, when the entire stent 10 is stretched in the axial direction and the radially extending portion 14 is deformed by falling, it becomes easy to deform the radially extending portion 14 and the small-diameter cylindrical portion 12 independently.

[0041] (B) Further, each of the plurality of second hook portions 40 (second connection portions 44) is not connected by a continuous portion to the second ridge portion 32 (second connected portion 34) of the mating partner. Therefore, as described above, when the entire stent 10 is stretched in the axial direction and the radially extending portion 14 is deformed by falling, compared with the reference embodiment, the portion around the boundary portion (contact portion) between the second hook portion 40 and the second ridge portion 32 that are connected to each other is easily deformed freely without resistance. For this reason, it becomes difficult for the second ridge portion 32 to be bent and deformed radially outward following the deformation by falling of the second hook portion 40 of the radially extending portion 14. As a result, the large-diameter cylindrical portion 16 does not become a shape in which the large-diameter cylindrical portion 16 is partially expanded around the boundary portion between the radially extending portion 14 and the large-diameter cylindrical portion 16, and it becomes easy to make the shape as straight as possible in the axial direction. That is, when the entire stent 10 is stretched in the axial direction and the radially extending portion 14 is deformed by falling, it becomes easy to deform the radially extending portion 14 and the large-diameter cylindrical portion 16 independently.

[0042] Note that when the entire stent 10 is stretched in the axial direction and the radially extending portion 14 is deformed by falling so that the stent 10 is made as straight as possible in the axial direction, it is advantageous for improving the operation stability when the stent 10 is deployed.

[0043] In this embodiment, each of the plurality of first hook portions 38 is radially movable relative to the first ridge portion 26 of the mating part. For example, consider a case where the radially extending portion 14 tends to contract together with the large-diameter cylindrical portion 16 due to pulsation or the like. In this case, the first hook portion 38 of the radially extending portion 14 moves radially inward relative to the first ridge portion 26 of the small-diameter cylindrical portion 12, thereby avoiding a situation where the outer end portion 12a of the small-diameter cylindrical portion 12 partially contracts following the contraction of the radially extending portion 14. Thereby, the adhesiveness to the inner cavity surface of the lumen organ around the outer end portion 12a of the small-diameter cylindrical portion 12 can be maintained.

[0044] Next, the manufacturing method of the above stent 10 will be described. This manufacturing method is simply performed in the order of the preparation step S10 → the connection step S12 → the connection step S14. The preparation step S10 is a step of preparing the small-diameter cylindrical portion 12, the large-diameter cylindrical portion 16, and the connection wire 18A that constitutes the radially extending portion 14 as shown in Fig. 2(A). The small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 of the present embodiment are prepared by assembling a mesh structure by hand or using a blader or the like. The connection step S12 is a step of connecting the connection wire 18A to the prepared small-diameter cylindrical portion 12 and large-diameter cylindrical portion 16. Thereby, the small-diameter cylindrical portion 12 and the large-diameter cylindrical portion 16 are joined together by the connection wire 18A. The connection step S14 is a step of connecting both ends of the connection wire 18A having the cut 18a used in the connection step S12 (see Fig. 2(B)) to each other. This is realized, for example, by caulking both ends with the ends of the connection wire 18A placed in the sleeve 24.

[0045] Referring to Figs. 7(A) and 7(B). In the preparation step 10, the connection wire 18A may be prepared, for example, by bending the base wire that is the material of the connection wire 18A using a jig 48. The jig 48 includes a mounting surface 48a on which the connection wire 18A is placed and a plurality of pins 48b protruding from the mounting surface 48a. The plurality of pins 48b are provided at positions corresponding to the inner peripheral side ridge portion 20 and the outer peripheral side ridge portion 22 of the connection wire 18A.

[0046] A method for bending a wire using the jig 48 will be described. First, a wire serving as a material of the connecting wire 18A is placed on the mounting surface 48a of the jig 48. After that, a first sub-step of forming an inner peripheral side mountain portion 20 on the wire by bending the wire around the pin 48b and a second sub-step of forming an outer peripheral side mountain portion 22 on the wire by bending the wire around the pin 48b are performed. The first sub-step is performed by bending the wire around the pin 48b corresponding to the inner peripheral side mountain portion 20 of the connecting wire 18A. The second sub-step is performed by bending the wire around the pin 48b corresponding to the outer peripheral side mountain portion 22 of the connecting wire 18A. The first sub-step is repeatedly performed until each inner peripheral side mountain portion 20 of the connecting wire 18A is formed, and the second sub-step is repeatedly performed until each outer peripheral side mountain portion 22 of the connecting wire 18A is formed. Thereby, a connecting wire 18A having a cut 18a between both ends can be obtained.

[0047] The connection step S12 will be described. In this connection step S12, in the present embodiment, a first step of passing the connecting wire 18A through a first opening 30 (see FIG. 2 etc.) formed by the first mountain portion 26 of the small-diameter cylindrical portion 12 and a second step of passing the connecting wire 18A through a second opening 36 (see FIG. 2 etc.) formed by the second mountain portion 32 of the large-diameter cylindrical portion 16 are repeated. At this time, the connecting wire 18A is passed through the first opening 30 and the second opening 36 in the same order as the circumferential order of the first opening 30 and the second opening 36 through which the connecting wire 18A passes in the completed stent 10. For example, the first opening 30 formed by the first mountain portion 26 located at the positions of the respective circles A1 to A14 in FIG. 4 is designated as the first opening 30A1 to A14, and the second opening 36 formed by the second mountain portion 32 of the squares B1 to B14 is designated as the second opening 36B1 to B14. At this time, in the example of FIG. 4, in the completed stent 10, the connecting wire 18A is passed in the order of the first opening 30A1 → the second opening 36B1 → the first opening 30A2 → the second opening 36B2 → ··· → the first opening 30A14 → the second opening 36B14. In this case, in the connection step S12, in the same order as in the completed stent 10, the connecting wire 18A is passed through the first opening 30A1 → the second opening 36B1 → the first opening 30A2 → the second opening 36B2 ··· → the first opening 30A14 → the second opening B14.

[0048] At this time, a portion of the connection wire 18A that is to become the first hook portion 38 is passed through the first opening 30. As a result, the portion of the connection wire 18A that is to become the first hook portion 38 is hooked on the first mountain portion 26 formed by the first opening 30, and the first hook portion 38 is connected to the first mountain portion 26. Also, at this time, a portion of the connection wire 18A that is to become the second hook portion 40 is passed through the second opening 36. As a result, the portion of the connection wire 18A that is to become the second hook portion 40 is hooked on the second mountain portion 32 formed by the second opening 36, and the second hook portion 40 is connected to the second mountain portion 32.

[0049] By passing the connection wire 18A through all the first openings 30 that should be passed through in the connection wire 18A, the first hook portion 38 of the connection partner is connected to each first mountain portion 26 of the small-diameter cylindrical portion 12. As a result, the connection wire 18A is connected to the small-diameter cylindrical portion 12. By repeating the same operation for all the connection wires 18A to be connected to the small-diameter cylindrical portion 12, the radially extending portion 14 is connected to the outer end portion 12a of the small-diameter cylindrical portion 12.

[0050] In addition to this, by passing the connection wire 18A through all the second openings 36 that should be passed through in the connection wire 18A, the second hook portion 40 of the connection partner is connected to each second mountain portion 32 of the large-diameter cylindrical portion 16, and thereby the connection wire 18A is connected to the large-diameter cylindrical portion 16. By repeating the same operation for all the connection wires 18A to be connected to the large-diameter cylindrical portion 16, the radially extending portion 14 is connected to the inner end portion 16a of the large-diameter cylindrical portion 16.

[0051] Note that by changing the angle of the mounting surface 48a of the jig 48, the angle of the radially extending portion 14 with respect to the axial direction can be changed. For example, when the radially extending portion 14 is 90 degrees, a jig 48 having a flat mounting surface 48a is prepared. On the other hand, when the angle of the radially extending portion 14 is 45 degrees, a jig 48 having a conical mounting surface 48a with an angle of 45 degrees with respect to the axial direction may be prepared.

[0052] Next, other features of the stent 10 will be described. Refer to FIGS. 8(A) and 8(B). FIG. 8(A) shows a state before the connection wire 18A of the radially extending portion 14 is connected to the small-diameter cylindrical portion 12 in the above-described connection step S12. When the radially extending portion 14 is not connected to the small-diameter cylindrical portion 12 and the small-diameter cylindrical portion 12 is in the maximum expansion state, let the distance from the center C12 of the small-diameter cylindrical portion 12 to the inner peripheral surface of the first peak portion 26 of the small-diameter cylindrical portion 12 be La. At this time, each of the plurality of first hook portions 38 of the radially extending portion 14 is connected to each of the plurality of first peak portions 26 so as to be maintained at a position radially outside the position where the distance is La for at least a part of the plurality of first peak portions 26. This condition does not need to be satisfied by all the first hook portions 38, but it is more desirable that the number of the first hook portions 38 satisfying this condition is larger. The radially extending portion 14 maintains the plurality of first peak portions 26 in a state where they are slightly expanded radially outward by hooking the plurality of first hook portions 38. In other words, the radially extending portion 14 is connected to the outer end portion 12a of the small-diameter cylindrical portion 12 in a state where the outer end portion 12a of the small-diameter cylindrical portion 12 is slightly expanded radially outward. Thereby, an appropriate radially outward pressing force F1 can be applied from the radially extending portion 14 to the small-diameter cylindrical portion 12, and it becomes easier to maintain the relative position in the axial direction between the two.

[0053] Refer to FIGS. 9(A) and 9(B). FIG. 9(A) shows the state before the connection wire 18A of the radially extending portion 14 is connected to the large-diameter cylindrical portion 16 in the above-described connection step S12. When the radially extending portion 14 is not connected to the large-diameter cylindrical portion 16 and the large-diameter cylindrical portion 16 is in the maximum expanded state, let the distance from the center C16 of the large-diameter cylindrical portion 16 to the outer peripheral surface of the second peak portion 32 of the large-diameter cylindrical portion 16 be Lb. At this time, each of the plurality of second hook portions 40 of the radially extending portion 14 is connected to each of the plurality of second peak portions 32 so as to be maintained at a position radially inward of the position where the distance is Lb for at least a part of the plurality of second peak portions 32. This condition does not need to be satisfied by all the second hook portions 40, but it is more desirable that the number of second hook portions 40 satisfying this condition is larger. The radially extending portion 14 maintains the plurality of second peak portions 32 in a state of being narrowed radially inward by hooking the plurality of second hook portions 40. In other words, the radially extending portion 14 is connected to the inner end portion 16a of the large-diameter cylindrical portion 16 in a state where the inner end portion 16a of the large-diameter cylindrical portion 16 is slightly narrowed radially inward. Thereby, an appropriate radially inward pressing force F2 can be applied from the radially extending portion 14 to the large-diameter cylindrical portion 16, and it becomes easier to maintain the relative position in the axial direction between the two.

[0054] (Second Embodiment) In the following embodiments, among the components described in the first embodiment, the components not described below have the same content as that of the first embodiment applied thereto. Refer to FIG. 10. The number of the second peak portions 32 of the large-diameter cylindrical portion 16 is different from the number of the first peak portions 26 of the small-diameter cylindrical portion 12. Thereby, by changing the difference in the number between the first peak portion 26 and the second peak portion 32, different structures corresponding to the difference in the number can be realized in the large-diameter cylindrical portion 16. Therefore, the degree of freedom in design can be increased as compared with the case where the number of the second peak portions 32 is the same as the number of the first peak portions 26.

[0055] For example, in the present embodiment, the number of the second peak portions 32 is larger than the number of the first peak portions 26. Specifically, the number of the second peak portions 32 is 14, and the number of the first peak portions 26 is 7. The more the number of the second peak portions 32 is larger than the number of the first peak portions 26, the denser the mesh of the net-like structure constituting the large-diameter cylindrical portion 16 can be, and the intrusion of a part of the biological tissue into the mesh, i.e., ingrowth, can be suppressed. In particular, the net-like structure (hereinafter referred to as the large-diameter net-like structure) constituting the large-diameter cylindrical portion 16 has a longer circumferential length than the net-like structure (hereinafter referred to as the small-diameter net-like structure) constituting the small-diameter cylindrical portion 12. For this reason, if the number of the second peak portions 32 of the large-diameter cylindrical portion 16 and the number of the first peak portions 26 of the small-diameter cylindrical portion 12 remain the same, there is a problem that the mesh of the large-diameter net-like structure becomes sparser than the mesh of the small-diameter net-like structure. In this regard, according to the present embodiment, this problem can be advantageously solved.

[0056] Refer to FIG. 11. As described above, even when the numbers of the respective peak portions 26 and 32 are different, the number of the outer circumferential side peak portions 22 and the number of the inner circumferential side peak portions 20 of the connecting wire member 18A constituting the radially extending portion 14 can be the same. For example, in the present embodiment, the number of each of the outer circumferential side peak portion 22 and the inner circumferential side peak portion 20 of the radially extending portion 14 is 14. On the other hand, when the numbers of the respective peak portions 26 and 32 are different, the number of the hook portions 38 and 40 connected to the respective peak portions 26 and 32 in the radially extending portion 14 changes. Specifically, the first hook portion 38 connected to the first peak portion 26 in the radially extending portion 14 is constituted by a part of the inner circumferential side peak portions 20 (a total of 7) located at the positions of the circled A1 to A7 among all the inner circumferential side peak portions 20, similar to the first peak portion 26. In the present embodiment, the inner circumferential side peak portions 20 forming the first hook portion 38 and the inner circumferential side peak portions 20 not forming the first hook portion 38 are alternately arranged. On the other hand, the second hook portion 40 connected to the second peak portion 32 in the radially extending portion 14 is constituted by all the outer circumferential side peak portions 22 (a total of 14) located at the positions of the square marks B1 to B14.

[0057] Note that the difference in the number of the peak portions 26 and 32 of each cylindrical portion 12 and 16 is not particularly limited, and the number of the second peak portions 32 may be at least less than the number of the first peak portions 26. Even in this case, the degree of freedom in design can be increased as compared with the case where the number of the second peak portions 32 is the same as the number of the first peak portions 26.

[0058] (Third Embodiment) Refer to FIGS. 12(A), 12(B), and 13. The radially extending portion 14 of the present embodiment includes a first connection wire 18A and a second connection wire 18B as a plurality of connection wires. The first connection wire 18A is provided such that the inner peripheral side peak portions 20A and 20B and the outer peripheral side peak portion 22 are alternately arranged in the circumferential direction. The inner peripheral side peak portions 20A and 20B include a first inner peripheral side peak portion 20A provided at a position overlapping the outer end portion 12a of the small diameter cylindrical portion 12 when viewed from the axial direction, and a second inner peripheral side peak portion 20B provided at a position shifted radially outward from the outer end portion 12a. The first connection wire 18A of the present embodiment is provided so as to be arranged in the order of the first inner peripheral side peak portion 20A → the outer peripheral side peak portion 22 → the second inner peripheral side peak portion 20B → the outer peripheral side peak portion 22 in the circumferential direction.

[0059] Each of the connection wires 18A and 18B has a wavy shape with the same wavelength and shifted in the circumferential direction by a phase difference (here, a phase difference of wavelength / 2) from each other. Also, each of the connection wires 18A and 18B is provided such that any one of the first inner peripheral side peak portions 20A of each of the connection wires 18A and 18B is located at positions spaced at equal angular intervals. The first inner peripheral side peak portion 20A constitutes the first hook portion 38, and the second inner peripheral side peak portion 20B does not constitute the first hook portion 38. In the present embodiment, first hook portions 38 (a total of 10) connected to the first peak portion 26 of the small diameter cylindrical portion 12 are provided at the positions of the circles A1 to A10.

[0060] Each of the connection wires 18A and 18B is provided such that the outer peripheral side peak portion 22 of either one of the connection wires 18A and 18B is positioned at each position with an equal angular interval. The outer peripheral side peak portions 22 of the connection wires 18A and 18B constitute the second hook portions 40. In the present embodiment, a total of 20 second hook portions 40 connected to the second peak portion 32 of the large-diameter cylindrical portion 16 are provided at the positions of the square marks B1 to B20. Similar to the second embodiment, the number of the first peak portions 26 of the small-diameter cylindrical portion 12 (total of 10) is different from the number of the second peak portions 32 of the large-diameter cylindrical portion 16 (total of 20).

[0061] By making the phase different between the first connection wire 18A and the second connection wire 18B, the first connection wire 18A and the second connection wire 18B form a crossing portion 50 that crosses each other. The first connection wire 18A and the second connection wire 18B form the crossing portion 50 at each position spaced in the circumferential direction. In the present embodiment, the wire portion from the first inner peripheral side peak portion 20A to the outer peripheral side peak portion 22 of each of the connection wires 18A and 18B forms the crossing portion 50. By forming such a crossing portion 50, the shape retention of the radially extending portion 14 can be enhanced.

[0062] The deformation modes of the above components will be described.

[0063] It is not essential that the stent 10 includes the large-diameter cylindrical portion 16. That is, the large-diameter cylindrical portion 16 of the stent 10 of the present disclosure may be omitted. When the large-diameter cylindrical portion 16 is omitted, in the above-described connection step S12, the connection wire 18A may be connected to the small-diameter cylindrical portion 12 by repeating the first sub-step of passing through the first peak portion 26 of the small-diameter cylindrical portion 12.

[0064] Although an example in which the stent 10 is provided with the radially extending portion 14 and the large-diameter cylindrical portion 16 on one end side of the small-diameter cylindrical portion 12 has been described, the radially extending portion 14 and the large-diameter cylindrical portion 16 may also be provided on the other end side. Although an example in which the large-diameter cylindrical portion 16 and the small-diameter cylindrical portion 12 form a straight cylindrical shape has been shown, their specific shapes are not particularly limited. For example, at least a part of the small-diameter cylindrical portion 12 may have a tapered shape in which the outer diameter becomes smaller toward the outside in the axial direction. Also, at least a part of the large-diameter cylindrical portion 16 may have a tapered shape in which the outer diameter becomes larger toward the outside in the axial direction.

[0065] The first connecting portion 42 of the radially extending portion 14 is connected to the first connected portion 28 of the small-diameter cylindrical portion 12 so as to prevent separation, and by being separated from the first connected portion 28, relative movement with respect to the first connected portion 28 is allowed. While the first hook portion 38 and the first ridge portion 26 have been described as the combination of the first connecting portion 42 and the first connected portion 28 while satisfying this condition, their specific examples are not particularly limited. For example, the first connecting portion 42 may be the inner peripheral side ridge portion 20 of the radially extending portion 14, the first connected portion 28 may be the first ridge portion 26, and the two may be connected by a separate stretchable member (such as a thread).

[0066] The second connecting portion 44 of the radially extending portion 14 is connected to the second connected portion 34 of the large-diameter cylindrical portion 16 so as to prevent separation, and by being separated from the second connected portion 34, relative movement with respect to the second connected portion 34 is allowed. While the second hook portion 40 and the second ridge portion 32 have been described as the combination of the second connecting portion 44 and the second connected portion 34 while satisfying this condition, their specific examples are not particularly limited. For example, the second connecting portion 44 may be the outer peripheral side ridge portion 22 of the radially extending portion 14, the second connected portion 34 may be the second ridge portion 32, and the two may be connected by a separate stretchable member (such as a thread).

[0067] The first connected portion 28 of the small-diameter cylindrical portion 12 may be constituted by a loop portion provided at the top of the first ridge portion 26. This loop portion has a shape wound with one or more turns. In this case, the first hook portion 38 serving as the first connection portion 42 of the radially extending portion 14 may be passed through the loop portion of the small-diameter cylindrical portion 12 and connected to the loop portion. By configuring the first connected portion 28 with the loop portion in this way, the degree of fixing of the position of the first hook portion 38 in the axial direction and the circumferential direction with respect to the first connected portion 28 is increased. Similarly, the second connected portion 34 of the large-diameter cylindrical portion 16 may be constituted by a loop portion provided at the top of the second ridge portion 26. In this case, the second hook portion 40 serving as the second connection portion 44 of the radially extending portion 14 may be passed through the loop portion of the large-diameter cylindrical portion 16 and connected to the loop portion.

[0068] The radially extending portion 14 does not necessarily have to be connected in a state where the outer end portion 12a of the small-diameter cylindrical portion 12 is widened. The radially extending portion 14 does not necessarily have to be connected in a state where the inner end portion 16a of the large-diameter cylindrical portion 16 is narrowed. An overlap portion may be formed in the connecting wire 18A of the radially extending portion 14.

[0069] Generalizing the technical ideas embodied by the above embodiments and modified forms, it can be said that the present disclosure includes the following technical ideas.

[0070] Consider the effect (A) of making it easier to independently deform the aforementioned small-diameter cylindrical portion 12 and the radially extending portion 14. In relation to this effect, compared with the case where all the first connecting portions 42 of the radially extending portion 14 are constituted by a wire continuous with the first connected portion 28 of the small-diameter cylindrical portion 12, the larger the number of the first connecting portions 42 constituting the first hook portion 38, the more preferable. This is because when the first hook portion 38 is constituted by the first connecting portion 42, the portion around the boundary portion (contact portion) between the first connecting portion 42 and the first connected portion 28 that are connected to each other is likely to deform freely without resistance. From this viewpoint, among the plurality of first connecting portions 42, the number of the first connecting portions 42 constituted by a wire continuous with the first connected portion 28 of the connection partner is preferably 2 or less, and the rest is preferably constituted by the first hook portion 38. In the first embodiment, although an example in which all these first connecting portions 42 (a total of 14) are constituted by the first hook portion 38 has been described, one or two of them may be constituted by a wire continuous with the first connected portion 28. When there are two first connecting portions 42 constituted by this continuous wire, the wires constituting the two first connecting portions 42 preferably form a crossing portion that crosses each other. Even in this case, compared with the case where all the first connecting portions 42 are constituted by a wire continuous with the first connected portion 28, the small-diameter cylindrical portion 12 and the radially extending portion 14 are more likely to deform independently.

[0071] Consider the effect (B) of making it easier to deform the aforementioned large-diameter cylindrical portion 16 and the radially extending portion 14 independently. In relation to this effect, compared to the case where all the second connecting portions 44 of the radially extending portion 14 are constituted by a wire continuous with the second connected portion 34 of the large-diameter cylindrical portion 16, the larger the number of second connecting portions 44 constituting the second hook portion 40, the more preferable. This is because when the second hook portion 40 constitutes the second connecting portion 44, the portion around the boundary (contact portion) between the second connecting portion 44 and the second connected portion 34 that are connected to each other is more likely to deform freely without resistance. From this perspective, among the plurality of second connecting portions 44, the number of second connecting portions 44 constituted by a wire continuous with the second connected portion 34 of the connection partner is preferably two or less, and the rest may be constituted by the second hook portion 40. In the first embodiment, an example in which all these second connecting portions 44 (a total of 14) are constituted by the second hook portion 40 has been described, but one or two of them may be constituted by a wire continuous with the second connected portion 34. When there are two second connecting portions 44 constituted by this continuous wire, the wires constituting the two second connecting portions 44 preferably form a crossing portion that crosses each other. Even in this case, compared to the case where all the second connecting portions 44 are constituted by a wire continuous with the second connected portion 34, the large-diameter cylindrical portion 16 and the radially extending portion 14 are more likely to deform independently.

[0072] The above embodiments and modified forms are illustrative. The technical ideas abstracted from these should not be construed in a limited manner to the content of the embodiments and modified forms. Many design changes such as changes, additions, deletions, etc. of components are possible for the content of the embodiments and modified forms. In the foregoing embodiments, with respect to the content for which such design changes are possible, the notation "embodiment" is attached and emphasized. However, design changes are also allowed for the content without such notation. The hatching attached to the cross-section of the drawing does not limit the material of the object to which the hatching is attached. The structures and numerical values mentioned in the embodiments and modified forms naturally include those that can be regarded as the same in consideration of manufacturing errors.

Explanation of Reference Numerals

[0073] 10…Stent, 12…Cylindrical part, 12a…Outer end, 14…Radially extending part, 16a…Inner end, 18A, 18B…Connection wire, 26…First peak part, 28…First connected part, 32…Second peak part, 34…Second connected part, 38…First hook part, 40…Second hook part, 42…First connection part, 44…Second connection part, 50…Cross part.

Claims

1. a first cylindrical portion; a radially extending portion connected to an outer end portion of the first cylindrical portion and provided so as to extend radially outward from the outer end portion; the first cylindrical portion and the radially extending portion are constituted by separate members; the radially extending portion includes a plurality of first connecting portions that are connected to respective ones of a plurality of first connected portions provided at the outer end portion so as to prevent separation; each of the plurality of first connecting portions is separated from a first connected portion of a connection partner of each of the plurality of first connecting portions and is allowed to move relative to the first connected portion of the connection partner; the radially extending portion includes at least one connecting wire member that extends in a wavy shape in the circumferential direction; one of the connecting wire members is a stent including a plurality of the first connecting portions connected to separate ones of the first connected portions.

2. The stent according to claim 1, wherein each of the plurality of first connecting portions is radially movable relative to a first connected portion of a connection partner.

3. a second cylindrical portion disposed axially outside the first cylindrical portion and having an outer diameter larger than that of the first cylindrical portion; The stent according to claim 1, wherein the radially extending portion is connected to an inner end portion of the second cylindrical portion and is constituted by a member separate from the second cylindrical portion.

4. The radially extending portion includes a plurality of second connecting portions that are connected to respective ones of a plurality of second connected portions provided at the inner end portion of the second cylindrical portion so as to prevent separation; The stent according to claim 3, wherein each of the plurality of second connecting portions is separated from a second connected portion of a connection partner of each of the plurality of second connecting portions and is allowed to move relative to the second connected portion of the connection partner.

5. the first cylindrical portion includes a plurality of first peak portions to which the radially extending portion is connected and which are arranged in the circumferential direction; the second cylindrical portion includes a plurality of second peak portions to which the radially extending portion is connected and which are arranged in the circumferential direction; The stent according to claim 3, wherein the number of the second peak portions is different from the number of the first peak portions.

6. the first cylindrical portion is constituted by a net-like structure including the plurality of first peak portions; the second cylindrical portion is constituted by a net-like structure including the plurality of second peak portions; The stent according to claim 5, wherein the number of the second peak portions is larger than the number of the first peak portions.

7. The stent according to claim 3, wherein the radially extending portion is connected to the inner end portion of the second cylindrical portion in a state where the inner end portion of the second cylindrical portion is narrowed radially inward.

8. The stent according to claim 1, wherein the radially extending portion is connected to the outer end portion in a state where the outer end portion is widened radially outward.

9. The stent according to claim 1, wherein the connecting wire member is not formed with an overlapping portion that overlaps a part of itself or another wire member along the wire length direction of the connecting wire member at a location other than both end portions of the connecting wire member.

10. The radially extending portion includes a plurality of the connecting wire members, The stent according to claim 1, wherein the plurality of connecting wire members form a crossing portion that crosses each other in part.

11. The connecting wire member includes a plurality of inner circumferential side ridges and a plurality of outer circumferential side ridges, and the inner circumferential side ridges and the outer circumferential side ridges are provided so as to be arranged alternately in the circumferential direction. The stent according to claim 1, wherein each of the plurality of inner circumferential side ridges constitutes an individual first connecting portion.

12. A first cylindrical portion, A radially extending portion connected to an outer end portion of the first cylindrical portion and provided so as to extend radially outward from the outer end portion, The first cylindrical portion and the radially extending portion are constituted by separate members, The radially extending portion includes a plurality of first connecting portions that are connected to respective ones of the plurality of first connected portions provided at the outer end portion in a manner capable of preventing separation, Each of the plurality of first connecting portions is separated from a first connected portion that is a connection partner of each of the plurality of first connecting portions, and relative movement of the connection partner with respect to the first connected portion is allowed. The radially extending portion includes at least one connecting wire member that extends in a wave shape in the circumferential direction. A method of manufacturing a stent, wherein one of the connecting wire members includes a plurality of the first connecting portions that are connected to separate first connected portions. The method of manufacturing a stent includes a connecting step of connecting the radially extending portion to an outer end portion of the first cylindrical portion.

13. The stent includes a second cylindrical portion that is disposed axially outward with respect to the first cylindrical portion and has an outer diameter larger than that of the first cylindrical portion. The radially extending portion is connected to an inner end portion of the second cylindrical portion and is constituted by a member separate from the second cylindrical portion. In the connecting step, the method of manufacturing a stent according to claim 12, wherein the radially extending portion is connected to the outer end portion of the first cylindrical portion and the radially extending portion is connected to the inner end portion of the second cylindrical portion.

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