Stent

Abstract

To suppress strength reduction and durability reduction of a cylindrical part caused by providing a projection part.SOLUTION: The stent includes a cylindrical portion and a first protruding portion. The tubular portion is formed of a braided wire. The tubular portion includes a first entwining portion and a second entwining portion in which the wires cross each other in a hook shape and are entwined with each other. The second engaging portion is disposed at a position different from that of the first engaging portion in the longitudinal direction of the tubular portion. The first protruding portion protrudes to an outer peripheral side of the tubular portion when the tubular portion expands. The first protrusion passes through a first hole formed in the first engaging portion and a second hole formed in the second engaging portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology disclosed herein relates to stents. [Background technology]

[0002] Stent placement is used when a stenosis or blockage (hereinafter collectively referred to as "stenosis") occurs in a body lumen. Stent placement is a procedure for securing the lumen by placing a stent either at the location of the stenosis or at a location that bypasses the stenosis. Examples of body lumens include digestive organs such as the bile duct, gallbladder, pancreas, esophagus, duodenum, small intestine, and large intestine, as well as blood vessels, ureters, and trachea.

[0003] The stent has a tubular portion formed of braided wires. The tubular portion has, for example, entangled portions where the wires cross each other in a hook-like shape. When a compressive force acts on the tubular portion in the radial direction, the tubular portion contracts in diameter, and when the compressive force is released, the tubular portion elastically expands in diameter to its pre-compression state.

[0004] A stent is mounted in a contracted state on a delivery system and transported to the placement site. When released from the delivery system, the stent self-expands and is placed in that state. If the stent becomes displaced after placement, its function may be reduced or other problems may occur. Therefore, stents are required to have the ability to stably maintain their placed position.

[0005] Known stents have, for example, protrusions that protrude outward from the tubular portion when the tubular portion is expanded. The protrusions function, for example, as anchors that prevent the stent from shifting position. In known stents, for example, the wires are not intentionally entangled at some of the positions where entanglements are formed in the tubular portion, and the protrusions are formed by bending the portions outward from the tubular portion (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2020 / 194506 Summary of the Invention [Problem to be solved by the invention]

[0007] In known stents, the wires are not entangled with each other at some of the positions where the entangled portions are formed in the tubular portion, which may reduce the strength and durability of the tubular portion.

[0008] This specification discloses a technique that can solve the above-mentioned problems. [Means for solving the problem]

[0009] The technology disclosed in this specification can be realized, for example, in the following forms.

[0010] (1) The stent disclosed in this specification comprises a tubular portion and a first protrusion. The tubular portion is formed of braided wires. The tubular portion has a first tangled portion and a second tangled portion in which the wires cross each other in a hook-like shape and are tangled with each other. The second tangled portion is disposed at a different position from the first tangled portion in the longitudinal direction of the tubular portion. The first protrusion protrudes toward the outer periphery of the tubular portion when the tubular portion is expanded. The first protrusion passes through a first hole formed in the first tangled portion and a second hole formed in the second tangled portion.

[0011] Compared to conventional configurations in which protrusions are provided, this stent intentionally does not entangle the wires at some of the entanglement positions, thereby suppressing the reduction in strength and durability of the tubular portion that would result from providing protrusions. This stent is able to suppress movement of the first protrusions because they pass through the first and second holes, thereby suppressing a decrease in the function of the protrusions due to their movement. This stent is able to avoid the first and second entanglement portions, which would make it difficult for the wires to move, from lining up in the circumferential direction because the first protrusions pass through them, thereby achieving a stent that can be easily expanded and contracted.

[0012] (2) In the above stent, the first entangled portion and the second entangled portion may be disposed at different positions in the circumferential direction of the tubular portion. This stent can prevent interference between the wires constituting the first protrusions when the stent is contracted, thereby realizing a stent that can be expanded and contracted more easily.

[0013] (3) In the above stent, the tubular portion may have another tangled portion between the first tangled portion and the second tangled portion in the circumferential direction of the tubular portion. This stent can effectively prevent interference between the portions of the wire constituting the first protrusions when the stent is contracted, and can realize a stent that can be expanded and contracted more easily.

[0014] (4) In the above stent, there may be no other entangled portion between the first entangled portion and the second entangled portion in the longitudinal direction of the tubular portion. This stent can improve the function of the protrusions.

[0015] (5) In the above stent, there may be no other entangled portion between the first entangled portion and the second entangled portion in the circumferential direction of the tubular portion. This stent can improve the function of the protrusions.

[0016] (6) In the above stent, the tubular portion may have another entangled portion between the first entangled portion and the second entangled portion in the longitudinal direction of the tubular portion. This stent can have a large distance between the first entangled portion and the second entangled portion, making it possible to realize a stent that can be expanded and contracted more easily.

[0017] (7) The above stent may further include a second protrusion that protrudes outward from the tubular portion when the tubular portion is expanded, the tubular portion having a third entanglement portion disposed at a position different from the second entanglement portion in the longitudinal direction of the tubular portion, the second protrusion passing through the second hole and a third hole formed in the third entanglement portion. This stent can prevent the first entanglement portion and the second entanglement portion, which make it difficult for the wires to move relative to each other, from being aligned in the circumferential direction by the passage of the first protrusion, and can prevent the second entanglement portion and the third entanglement portion, which make it difficult for the wires to move relative to each other, from being aligned in the circumferential direction by the passage of the second protrusion, thereby realizing a stent that can be easily expanded and contracted while having multiple protrusions.

[0018] (8) In the above stent, the first entangled portion, the second entangled portion, and the third entangled portion may be arranged in this order in the longitudinal direction of the tubular portion. This stent can be provided with a plurality of protrusions and can be expanded and contracted more easily.

[0019] (9) In the above stent, the first entangled portion, the second entangled portion, and the third entangled portion may be arranged in this order in the circumferential direction of the tubular portion. This stent can prevent interference between the first protrusions and the second protrusions when the stent is contracted, thereby achieving a stent that can be easily expanded and contracted.

[0020] (10) In the stent, the first entangled portion and the third entangled portion may be disposed at the same position in the longitudinal direction of the tubular portion. This stent can shorten the length of the region where the plurality of protrusions are provided on the tubular portion.

[0021] The techniques disclosed in this specification can be realized in various forms, for example, in the form of a stent, a method for manufacturing a stent, and the like. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is an explanatory diagram showing the external configuration of a stent according to a first embodiment. [Figure 2] FIG. 1 is an explanatory diagram showing a planar configuration of a stent in a first embodiment. [Figure 3] FIG. 1 is a development view of a stent according to a first embodiment, which is developed in the circumferential direction. [Figure 4] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 5] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 6] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 7] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 8] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 9] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 10] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 11] FIG. 1 is an explanatory diagram showing a method for weaving a stent in the first embodiment. [Figure 12] FIG. 10 is a development view of a stent according to a modification of the first embodiment, which is developed in the circumferential direction. [Figure 13] FIG. 10 is an explanatory diagram showing the external configuration of a stent according to a second embodiment. [Figure 14] FIG. 10 is an explanatory diagram showing the planar configuration of a stent in a second embodiment. [Figure 15] FIG. 10 is a development view of a stent according to a second embodiment, which is developed in the circumferential direction. [Figure 16] FIG. 10 is an explanatory diagram showing a method for weaving a stent in a second embodiment. [Figure 17]FIG. 10 is an explanatory diagram showing a method for weaving a stent in a second embodiment. [Figure 18] FIG. 10 is an explanatory diagram showing a method for weaving a stent in a second embodiment. [Figure 19] FIG. 10 is an explanatory diagram showing a method for weaving a stent in a second embodiment. [Figure 20] FIG. 10 is an explanatory diagram showing a method for weaving a stent in a second embodiment. [Figure 21] FIG. 10 is a development view of a stent according to a modification of the second embodiment, which is developed in the circumferential direction. DETAILED DESCRIPTION OF THE INVENTION

[0023] (Configuration of stent 10) FIG. 1 is an explanatory diagram showing the external configuration of a stent 10 in a first embodiment. FIG. 2 is an explanatory diagram showing the planar configuration of the stent 10 in the first embodiment. FIG. 3 is a development view of the stent 10 in the first embodiment developed in the circumferential direction. In this specification, the circumferential direction means the circumferential direction centered on a central axis Ax extending in the longitudinal direction of a tubular portion 110, which will be described later. In the following description, for convenience, the positive Z-axis direction side may be referred to as the upper side, and the negative Z-axis direction side may be referred to as the lower side.

[0024] The stent 10 is a medical device that, when a stricture occurs in a body lumen, is placed either at the location of the stricture or at a location that bypasses the stricture to secure the lumen. Examples of body lumens include digestive organs such as the bile duct, gallbladder, pancreas, esophagus, duodenum, small intestine, and large intestine, as well as blood vessels, ureters, and tracheas. The stent 10 of this embodiment is a self-expanding stent that contracts in diameter when a compressive force is applied in the radial direction and elastically expands to its pre-compressed state when the compressive force is released. Figures 1 and 2 show the stent 10 in an expanded state.

[0025] The stent 10 has a tubular portion 110 and protruding portions 120. The stent 10 may have a resin cover film that covers at least one of the tubular portion 110 and the protruding portions 120.

[0026] The tubular portion 110 is a portion that becomes tubular when the stent 10 is expanded. The cross-sectional shape of the tubular portion 110 is, for example, circular. The outer diameter of the tubular portion 110 when expanded is, for example, 4 mm or more and 80 mm or less. The length of the tubular portion 110 along the longitudinal direction (Z-axis direction) is, for example, 20 mm or more and 200 mm or less.

[0027] The cylindrical portion 110 is formed by braiding wire W. The braiding method of the cylindrical portion 110 is so-called hook braiding. In the cylindrical portion 110, cells CE, which are approximately diamond-shaped voids surrounded by the wire W, are regularly arranged.

[0028] The cylindrical portion 110 has multiple intersections 102 and multiple entanglement portions 101. The intersections 102 are locations where the wires W intersect without becoming entangled with each other. The entanglement portions 101 are locations where a first bent portion 141, which is a bent portion of the wire W, and a second bent portion 142, which is also a bent portion of the wire W, intersect in a hook-like shape and become entangled with each other. The first bent portion 141 is, for example, a generally V-shaped portion that is convex upward. The second bent portion 142 is, for example, a generally V-shaped portion that is convex downward. The entanglement portion 101 is surrounded by the first bent portion 141 and the second bent portion 142 and has a hole 11 that penetrates the cylindrical portion 110 in the radial direction. In the entanglement portion 101, the first bent portion 141 and the second bent portion 142 are connected to each other so as to be inseparable but movable relative to each other. Therefore, the cylindrical portion 110 can be compressed or curved in the longitudinal direction.

[0029] End protrusions 140 are formed at the upper and lower ends of the tubular portion 110. The end protrusions 140 are substantially V-shaped portions formed by the wire W. When the stent 10 is radially expanded, the extension direction of the end protrusions 140 is substantially parallel to the central axis Ax of the tubular portion 110. In this embodiment, six end protrusions 140 are arranged continuously in the circumferential direction at the upper end of the tubular portion 110, and six end protrusions 140 are arranged continuously in the circumferential direction at the lower end of the tubular portion 110.

[0030] The protrusions 120 are formed of wire W. When the tubular portion 110 is expanded, the protrusions 120 protrude outward from the tubular portion 110 and function as anchors that contact the body wall of the biological lumen and prevent the stent 10 from shifting position. In this embodiment, when the tubular portion 110 is expanded, both ends of the protrusions 120 are positioned on the outer circumferential surface of the tubular portion 110, and the substantially V-shaped wire W constituting the protrusions 120 extends obliquely downward from the outer circumferential surface of the tubular portion 110 toward the outside. The inclination of the protrusions 120 is, for example, 20 degrees or more and 80 degrees or less, and may be, for example, 30 degrees or more and 70 degrees or less. In this embodiment, the stent 10 has eleven protrusions 120 (protrusions 120A to 120K). The eleven protrusions 120 are arranged spirally and continuously with each other near the upper end of the tubular portion 110. Due to the presence of the protrusions 120, when the stent 10 is expanded, the maximum radius of the stent 10 becomes larger than the radius of the tubular portion 110. As shown in Fig. 2, the maximum radius of the stent 10 is the distance L3 from the central axis Ax of the tubular portion 110 to the outermost point Pt of the protrusions 120. The distance L3 is, for example, not less than 4 mm and not more than 50 mm.

[0031] The protruding portion 120 is formed so as to pass through a hole 11 formed in the tangling portion 101 of the tubular portion 110. More specifically, one end of the protruding portion 120 passes through a hole 11 formed in the tangling portion 101, and the other end of the protruding portion 120 passes through a hole 11 formed in the other tangling portion 101. Hereinafter, for each protruding portion 120, the two tangling portions 101 in which holes 11 are formed and through which the two ends of the protruding portion 120 pass are also referred to as the tangling portions 101 that support the protruding portion 120.

[0032] In this embodiment, the two entanglement portions 101 supporting the protrusions 120 are disposed at different positions in the longitudinal direction of the tubular portion 110. For example, one end of one protrusion 120 (hereinafter referred to as a "first protrusion 120A") shown in FIG. 3 passes through a hole 11 (hereinafter referred to as a "first hole 11A") formed in one entanglement portion 101 (hereinafter referred to as a "first entanglement portion 101A"), and the other end of the first protrusion 120A passes through a hole 11 (hereinafter referred to as a "second hole 11B") formed in another entanglement portion 101 (hereinafter referred to as a "second entanglement portion 101B"). The first entanglement portion 101A in which the first hole 11A is formed and the second entanglement portion 101B in which the second hole 11B is formed are disposed at different positions in the longitudinal direction of the tubular portion 110.

[0033] The protrusions 120 other than the first protrusion 120A also have the above-described characteristics. For example, one end of one protrusion 120 (hereinafter referred to as the "second protrusion 120B") shown in Fig. 3 passes through the second hole 11B formed in the second entanglement portion 101B described above, and the other end of the second protrusion 120B passes through the hole 11 (hereinafter referred to as the "third hole 11C") formed in another entanglement portion 101 (hereinafter referred to as the "third entanglement portion 101C"). The second entanglement portion 101B in which the second hole 11B is formed and the third entanglement portion 101C in which the third hole 11C is formed are disposed at different positions in the longitudinal direction of the tubular portion 110.

[0034] In this embodiment, in the longitudinal direction of the cylindrical portion 110, another tangled portion 101 (for example, tangled portion 101Z shown in FIG. 3) exists between the two tangled portions 101 (first tangled portion 101A and second tangled portion 101B) that support the first protrusion 120A. Some of the protrusions 120 (protrusions 120B, 120C) other than the first protrusion 120A also have this characteristic. As for the remaining protrusions 120 (protrusions 120D to 120K), no other tangled portion 101 exists between the two tangled portions 101 that support the protrusions 120 in the longitudinal direction of the cylindrical portion 110.

[0035] In this embodiment, the two tangled portions 101 (first tangled portion 101A and second tangled portion 101B) that support the first protrusion 120A are arranged at different positions in the circumferential direction of the cylindrical portion 110. Another tangled portion 101 (for example, tangled portion 101Z shown in FIG. 3) exists between the two tangled portions 101 that support the first protrusion 120A in the circumferential direction of the cylindrical portion 110. The protrusions 120 other than the first protrusion 120A also have such characteristics.

[0036] Focusing on the tangling portion 101 supporting the first protruding portion 120A and the second protruding portion 120B, the first tangling portion 101A, the second tangling portion 101B, and the third tangling portion 101C are arranged in this order in the longitudinal direction of the cylindrical portion 110. The first tangling portion 101A, the second tangling portion 101B, and the third tangling portion 101C are also arranged in this order in the circumferential direction of the cylindrical portion 110.

[0037] Focusing on the protrusions 120D and 120E, these two protrusions 120 are supported by a common tangling portion 101 (hereinafter referred to as the "common tangling portion 101X"). The tangling portion 101 other than the common tangling portion 101X supporting the protrusion 120D (hereinafter referred to as the "other tangling portion 101Y1") and the tangling portion 101 other than the common tangling portion 101X supporting the protrusion 120E (hereinafter referred to as the "other tangling portion 101Y2") are arranged at the same position in the longitudinal direction of the tubular portion 110. The protrusion 120D is another example of a first protrusion, the protrusion 120E is another example of a second protrusion, the other tangling portion 101Y1 is another example of a first tangling portion, and the other tangling portion 101Y2 is another example of a second tangling portion.

[0038] In this embodiment, the cylindrical portion 110 and the protruding portion 120 are continuously formed by weaving a single wire W. However, they may also be formed from separate wires W. The wire W is formed from a superelastic alloy such as a nickel-titanium (Ni-Ti) alloy. The wire W may be formed from other metals such as stainless steel, tantalum, titanium, cobalt-chromium alloy, magnesium alloy, etc., or may be formed from a resin such as polyolefin, polyester, fluororesin, etc. The outer diameter of the wire W is, for example, 0.05 mm or more and 0.5 mm or less.

[0039] (Method of manufacturing stent 10) As described above, the stent 10 of this embodiment is produced by hook knitting the wire W. A method for producing a stent by hook knitting is publicly known, as described in, for example, Japanese Patent No. 3708923. A brief description will be given below.

[0040] 4 to 11 are explanatory diagrams showing a method for weaving a stent 10 in the first embodiment. Each of the columns in Figs. 4 to 11 shows, in the form of a development, the procedure for producing a stent 10 by weaving a wire W using a jig JG having a plurality of pins PN on the outer circumferential surface of a cylindrical member. Hereinafter, the distance between two diagonally adjacent pins PN on the jig JG will be referred to as the diagonal distance LP. In each figure, the portion of the wire W indicated by a thick solid line is the portion that will be weaved in the process shown in that figure.

[0041] First, as shown in FIG. 4, the worker fixes an end of the wire W to a pin PN at a predetermined position of the jig JG to set the starting point ST, and then loops the wire W between the pins PN in a zigzag pattern from the starting point ST. More specifically, the worker extends the wire W diagonally upward and left from the starting point ST and loops it over the pins PN. The worker then repeats a combination of the first and second operations until the wire W reaches a position corresponding to the upper end of the cylindrical portion 110. The first operation is an operation in which the wire W is extended diagonally downward and left by 1×LP and looped over the pins PN. The second operation is an operation in which the wire W is extended diagonally upward and left by 2×LP and looped over the pins PN.

[0042] Next, as shown in FIG. 5 , the worker loops the wire W between the pins PN in a zigzag pattern so as to form six upwardly convex V-shaped portions (end protrusions 140) from a position corresponding to the upper end of the cylindrical portion 110. More specifically, the worker performs five sets of operations: extending the wire W diagonally downward and left by 1×LP and looping it under the pin PN; extending the wire W diagonally upward and left by 1×LP and looping it over the pin PN; and extending the wire W diagonally downward and left by 2×LP and looping it under the pin PN, thereby forming the six end protrusions 140. When knitting with a hook, the worker crosses the wires W in a hook shape at positions of the pins PN where the wire W is already wound, thereby forming entanglement portions 101. At positions where the wire W passes obliquely without being wound around the pins PN, the worker crosses the wires W without entangling them, thereby forming intersection portions 102.

[0043] Next, as shown in FIG. 6 , the worker weaves the wire W downward until the weaving of the region of the cylindrical portion 110 where the protrusion 120 is to be disposed is completed. Specifically, the worker repeats three sets of operations: extending the wire W diagonally upward and left by 1×LP to hook it over the pin PN, and extending the wire W diagonally downward and left by 1×LP to hook it under the pin PN. Then, the worker performs one set of operations: extending the wire W diagonally upward and left by 1×LP to hook it over the pin PN, and extending the wire W diagonally downward and left by 2×LP to hook it under the pin PN. The worker repeats these operations until the wire W reaches a first position P1, which is the lower end of the region where the protrusion 120 is to be disposed. At this point, multiple entangled portions 101 having holes 11 are formed in the region above the first position P1.

[0044] Next, as shown in FIG. 7, the worker passes the wire W between the pins PN in a zigzag pattern to form four large V-shaped protrusions 120 that are convex downward. More specifically, the worker forms the protrusion 120A by combining the operation of extending the wire W diagonally downward and left by 1×LP from the first position P1 to pass it under the pin PN, and the operation of extending the wire W diagonally upward and left by 3×LP to pass it over the pin PN. The worker performs similar operations to form the protrusions 120B to 120D. When the formation of the protrusion 120D is completed, the wire W reaches the second position P2. The worker passes the wire W through the holes 11 formed in the entanglement portion 101 at both ends of the protrusion 120.

[0045] Next, as shown in Fig. 8, the worker passes the wire W between the pins PN in a zigzag pattern to form seven large V-shaped protrusions 120 that are convex downward. More specifically, the worker forms protrusion 120E by combining the operation of extending the wire W diagonally downward and left by 2 x LP from the second position P2 to place it under the pins PN, and the operation of extending the wire W diagonally upward and left by 1 x LP to place it over the pins PN. The worker then performs similar operations to form protrusions 120F to 120K. When the formation of protrusion 120K is complete, the wire W returns to the first position P1.

[0046] 9 and 10, the worker braids the remaining portion of the tubular portion 110. Specifically, the worker performs a combination of an operation of extending the wire W diagonally downward and left by 2×LP to hook it under the pin PN, and an operation of extending the wire W diagonally upward and left by 1×LP to hook it over the pin PN, and then performs three sets of an operation of extending the wire W diagonally downward and left by 1×LP to hook it under the pin PN, and an operation of extending the wire W diagonally upward and left by 1×LP to hook it over the pin PN. The worker repeats these operations until the wire W reaches a position corresponding to the lower end of the tubular portion 110.

[0047] Next, as shown in FIG. 11 , the worker passes the wire W between the pins PN in a zigzag pattern to form six downwardly convex V-shaped end protrusions 140. That is, the worker performs six sets of operations: extending the wire W diagonally downward and left by 1×LP to place it under the pin PN, and extending the wire W diagonally upward and left by 1×LP to place it above the pin PN, thereby forming the six end protrusions 140. After forming the sixth end protrusion 140, the worker extends the wire W to the starting point ST and connects both ends of the wire W at the starting point ST by, for example, crimping to form the crimped portion 114. Through the above steps, the stent 10 is produced before the protrusions 120 are processed.

[0048] Next, the worker uses, for example, a disk-shaped mold to lift and fix the unprocessed protrusions 120 so that they protrude outward from the tubular portion 110, and then performs a heat treatment for shape memory (for example, at 350 to 600°C for 5 to 60 minutes). This forms the protrusions 120 that protrude outward from the tubular portion 110 when expanded. Through the above steps, the production of the stent 10 of this embodiment is completed.

[0049] (Method of using the stent 10) An example of a method of using the stent 10 of this embodiment is as follows. First, the technician mounts the stent 10 in a contracted state on a delivery system. When the stent 10 is in the contracted state, the protrusions 120 are folded so as not to protrude outward from the tubular portion 110. Next, the technician transports the stent 10 to an implantation position within a biological lumen using the delivery system, and releases the stent 10 from the delivery system at the implantation position. As a result, the stent 10 expands due to its self-expanding properties. When the stent 10 is in the expanded state, the protrusions 120 protrude outward from the tubular portion 110. Therefore, the protrusions 120 come into contact with the body wall of the biological lumen and function as anchors, preventing the stent 10 from shifting out of position.

[0050] The protrusions 120 are oriented so as to extend obliquely downward from the connection portions with the tubular portion 110. Therefore, when a downward force is applied to the stent 10, the protrusions 120 change angle with the connection portions with the tubular portion 110 as a fulcrum, increasing the inclination of the protrusions 120 relative to the tubular portion 110. As a result, the outer diameter of the stent 10 becomes even larger, the anchoring function of the protrusions 120 is enhanced, and displacement of the stent 10 is more effectively suppressed.

[0051] (Effects of the first embodiment) As described above, the stent 10 of this embodiment includes a tubular portion 110 and protruding portions 120. The tubular portion 110 is formed from braided wires W. The tubular portion 110 has a first tangled portion 101A and a second tangled portion 101B in which the wires W cross each other in a hook shape and become tangled with each other. The second tangled portion 101B is disposed at a different position from the first tangled portion 101A in the longitudinal direction of the tubular portion 110. The protruding portions 120 protrude toward the outer periphery of the tubular portion 110 when the tubular portion 110 is expanded. The first protruding portion 120A, which is one of the protruding portions 120, passes through a first hole 11A formed in the first tangled portion 101A and a second hole 11B formed in the second tangled portion 101B.

[0052] The stent 10 of this embodiment can suppress displacement of the stent 10 after placement due to the anchoring effect of the protrusions 120. Compared to conventional configurations in which protrusions are provided by intentionally not entangling wires at some of the entanglement formation positions, the stent 10 of this embodiment can suppress a decrease in strength and durability of the tubular portion 110 due to the provision of the protrusions 120. The stent 10 of this embodiment can suppress movement of the first protrusions 120A because the first protrusions 120A pass through the first hole 11A and the second hole 11B, thereby suppressing a decrease in anchor function due to movement of the first protrusions 120A. The stent 10 of this embodiment can prevent the first entanglement portion 101A and the second entanglement portion 101B, which make it difficult for the wires W to move relative to each other, from being aligned in the circumferential direction due to the passage of the first protrusions 120A, thereby realizing a stent 10 that can be easily expanded and contracted.

[0053] In the stent 10 of this embodiment, the first entangled portion 101A and the second entangled portion 101B are arranged at different positions in the circumferential direction of the tubular portion 110. The stent 10 of this embodiment can prevent the portions of the wire W that make up the first protrusion 120A from interfering with each other when the stent 10 is contracted, thereby realizing a stent 10 that can be expanded and contracted more easily.

[0054] In the stent 10 of this embodiment, the tubular portion 110 has another tangled portion 101 between the first tangled portion 101A and the second tangled portion 101B in the circumferential direction of the tubular portion 110. The stent 10 of this embodiment can effectively prevent the portions of the wire W that make up the first protrusion 120A from interfering with each other when the stent 10 is contracted, and can realize a stent 10 that can be expanded and contracted more easily.

[0055] In the stent 10 of this embodiment, the tubular portion 110 has another entangled portion 101 between the first entangled portion 101A and the second entangled portion 101B in the longitudinal direction of the tubular portion 110. The stent 10 of this embodiment can have a large distance between the first entangled portion 101A and the second entangled portion 101B, thereby realizing a stent 10 that can be expanded and contracted more easily.

[0056] The stent 10 of this embodiment further includes a second protrusion 120B. The tubular portion 110 has a third entanglement portion 101C that is disposed at a different position from the second entanglement portion 101B in the longitudinal direction of the tubular portion 110. The second protrusion 120B passes through the second hole 11B and the third hole 11C formed in the third entanglement portion 101C. The stent 10 of this embodiment can prevent the first entanglement portion 101A and the second entanglement portion 101B, which make it difficult for the wires W to move relative to each other, from being aligned in the circumferential direction by the passage of the first protrusion 120A. Furthermore, the stent 10 of this embodiment can prevent the second entanglement portion 101B and the third entanglement portion 101C, which make it difficult for the wires W to move relative to each other, from being aligned in the circumferential direction by the passage of the second protrusion 120B. This allows for the realization of a stent 10 that is easily expandable and contractible while including a plurality of protrusions 120.

[0057] In the stent 10 of this embodiment, a first entangled portion 101A, a second entangled portion 101B, and a third entangled portion 101C are arranged in this order in the longitudinal direction of the tubular portion 110. The stent 10 of this embodiment can realize a stent 10 that is more easily expandable and contractible while having a plurality of protrusions 120.

[0058] In the stent 10 of this embodiment, the first tangled portion 101A, the second tangled portion 101B, and the third tangled portion 101C are arranged in this order in the circumferential direction of the tubular portion 110. The stent 10 of this embodiment can prevent interference between the first protrusions 120A and the second protrusions 120B when the stent 10 is contracted, thereby realizing a stent 10 that can be easily expanded and contracted.

[0059] In the stent 10 of this embodiment, for some of the protrusions 120, no other tangled portions 101 are present between the two tangled portions 101 supporting the protrusions 120 in the longitudinal direction of the tubular portion 110. The stent 10 of this embodiment can improve the anchoring function of the protrusions 120.

[0060] In the stent 10 of this embodiment, for some combinations of the protrusions 120, the tangled portion 101 (the other tangled portion 101Y1) other than the common tangled portion 101X supporting the protrusion 120D and the tangled portion 101 (the other tangled portion 101Y2) other than the common tangled portion 101X supporting the protrusion 120E are arranged at the same position in the longitudinal direction of the tubular portion 110. The stent 10 of this embodiment can shorten the length of the installation area of ​​the multiple protrusions 120 on the tubular portion 110.

[0061] (Modification of the first embodiment) Fig. 12 is a development view of a stent 10a according to a modification of the first embodiment, developed in the circumferential direction. The stent 10a according to the modification shown in Fig. 12 has six protrusions 120 (protrusions 120A to 120F). One end of each protrusion 120 passes through a hole 11 formed in a tangled portion 101, and the other end of each protrusion 120 passes through a hole 11 formed in another tangled portion 101.

[0062] In this modification, similarly to the first embodiment, the two entanglement portions 101 supporting the protrusions 120 are disposed at different positions in the longitudinal direction of the tubular portion 110. For example, one end of one protrusion 120 (hereinafter referred to as the "first protrusion 120A") passes through a hole 11 (hereinafter referred to as the "first hole 11A") formed in one entanglement portion 101 (hereinafter referred to as the "first entanglement portion 101A"), and the other end of the first protrusion 120A passes through a hole 11 (hereinafter referred to as the "second hole 11B") formed in the other entanglement portion 101 (hereinafter referred to as the "second entanglement portion 101B"). The first entanglement portion 101A in which the first hole 11A is formed and the second entanglement portion 101B in which the second hole 11B is formed are disposed at different positions in the longitudinal direction of the tubular portion 110.

[0063] In this modification, similarly to the first embodiment, the protrusions 120 other than the first protrusion 120A also have the above-described characteristics. For example, one end of one protrusion 120 (hereinafter referred to as the "second protrusion 120B") passes through the second hole 11B, and the other end of the second protrusion 120B passes through a hole 11 (hereinafter referred to as the "third hole 11C") formed in another entanglement portion 101 (hereinafter referred to as the "third entanglement portion 101C"). The second entanglement portion 101B in which the second hole 11B is formed and the third entanglement portion 101C in which the third hole 11C is formed are disposed at different positions from each other in the longitudinal direction of the tubular portion 110.

[0064] In this modification, similarly to the first embodiment, another tangled portion 101 exists between the two tangled portions 101 supporting the first protrusion 120A in the longitudinal direction of the tubular portion 110. Some of the protrusions 120 (protrusions 120B to 120E) other than the first protrusion 120A also have this characteristic. As for the remaining protrusion 120 (protrusion 120F), no other tangled portion 101 exists between the two tangled portions 101 supporting the protrusion 120 in the longitudinal direction of the tubular portion 110.

[0065] In this modification, similarly to the first embodiment, the two tangled portions 101 supporting the first protruding portion 120A are disposed at different positions in the circumferential direction of the cylindrical portion 110. Another tangled portion 101 exists between the two tangled portions 101 supporting the first protruding portion 120A in the circumferential direction of the cylindrical portion 110. The protruding portions 120 other than the first protruding portion 120A also have such characteristics.

[0066] In this modification, similarly to the first embodiment, when attention is paid to entanglement portion 101 supporting first protrusion 120A and second protrusion 120B, first entanglement portion 101A, second entanglement portion 101B, and third entanglement portion 101C are arranged in this order in the longitudinal direction of tubular portion 110. First entanglement portion 101A, second entanglement portion 101B, and third entanglement portion 101C are also arranged in this order in the circumferential direction of tubular portion 110.

[0067] The stent 10a of this modification has the same configuration as the stent 10 of the first embodiment described above, and therefore exhibits the same effects as the stent 10 of the first embodiment described above.

[0068] (Second embodiment) Fig. 13 is an explanatory diagram showing the external configuration of stent 10b in the second embodiment. Fig. 14 is an explanatory diagram showing the planar configuration of stent 10b in the second embodiment. Fig. 15 is a development view of stent 10b in the second embodiment developed in the circumferential direction. In the following, among the configuration of stent 10b in the second embodiment, the same configuration as that of stent 10 in the first embodiment described above will be assigned the same reference numerals and description thereof will be omitted as appropriate.

[0069] The stent 10b of the second embodiment has a tubular portion 110 and a protruding portion .

[0070] The protrusions 130 are formed of a wire W. When the tubular portion 110 is expanded, the protrusions 130 protrude outward from the tubular portion 110 and contact the body wall of the biological lumen, functioning as spacers that ensure a space between the tubular portion 110 and the body wall for, for example, the flow of bodily fluids. In this embodiment, when the tubular portion 110 is expanded, the protrusions 130 are positioned such that both ends of the protrusions 130 are located on the outer circumferential surface of the tubular portion 110 and the substantially U-shaped wire W that constitutes the protrusions 130 is separated from the outer circumferential surface of the tubular portion 110 and connects both ends of the protrusions 130. In this embodiment, the stent 10b has twelve protrusions 130 (protrusions 130A to 130L). The twelve protrusions 130 are arranged in a circumferential direction near the upper end of the tubular portion 110. Due to the presence of the protrusions 130, the maximum radius of the stent 10b becomes larger than the radius of the tubular portion 110 when the stent 10b is expanded. As shown in FIG. 14, the maximum radius of the stent 10b is the distance L3 from the central axis Ax of the tubular portion 110 to the outermost point Pt of the protrusions 130. The distance L3 is, for example, 4 mm or more and 50 mm or less. In the example shown in FIG. 14, the protrusion amounts of the protrusions 130 are approximately the same. The protrusion amounts of the protrusions 130 may also be different from one another.

[0071] Like the protruding portion 120 in the first embodiment, the protruding portion 130 is formed to pass through the hole 11 formed in the tangling portion 101. More specifically, one end of the protruding portion 130 passes through the hole 11 formed in the tangling portion 101, and the other end of the protruding portion 130 passes through the hole 11 formed in the other tangling portion 101. The two tangling portions 101 that support the protruding portion 130 are arranged at different positions from each other in the longitudinal direction of the tubular portion 110. 15, one end of one protrusion 130 (hereinafter referred to as "first protrusion 130A") passes through a hole 11 (hereinafter referred to as "first hole 11A") formed in one tangling portion 101 (hereinafter referred to as "first tangling portion 101A"), and the other end of first protrusion 130A passes through a hole 11 (hereinafter referred to as "second hole 11B") formed in another tangling portion 101 (hereinafter referred to as "second tangling portion 101B"). First tangling portion 101A in which first hole 11A is formed and second tangling portion 101B in which second hole 11B is formed are disposed at different positions from each other in the longitudinal direction of tubular portion 110.

[0072] The protrusions 130 other than the first protrusion 130A also have the above-described characteristics. For example, one end of one protrusion 130 (hereinafter referred to as the "second protrusion 130B") shown in Fig. 15 passes through the second hole 11B, and the other end of the second protrusion 130B passes through a hole 11 (hereinafter referred to as the "third hole 11C") formed in another entanglement portion 101 (hereinafter referred to as the "third entanglement portion 101C"). The second entanglement portion 101B in which the second hole 11B is formed and the third entanglement portion 101C in which the third hole 11C is formed are disposed at different positions from each other in the longitudinal direction of the tubular portion 110.

[0073] In this embodiment, another tangled portion 101 exists between the two tangled portions 101 supporting the first protrusion 130A in the longitudinal direction of the tubular portion 110. The protrusions 130 other than the first protrusion 130A also have such characteristics.

[0074] In this embodiment, the two tangled portions 101 supporting the first protrusion 130A are disposed at different positions in the circumferential direction of the cylindrical portion 110. In this embodiment, no other tangled portions 101 are present between the two tangled portions 101 supporting the first protrusion 130A in the circumferential direction of the cylindrical portion 110. The protrusions 130 other than the first protrusion 130A also have this characteristic.

[0075] Looking at the tangling portion 101 supporting the first protrusion 130A and the second protrusion 130B, the first tangling portion 101A, the second tangling portion 101B, and the third tangling portion 101C are arranged in this order in the circumferential direction of the tubular portion 110.

[0076] Focusing on the protrusions 130E and 130F, these two protrusions 120 are supported by a common tangling portion 101 (hereinafter referred to as the "common tangling portion 101X"). The tangling portion 101 other than the common tangling portion 101X supporting the protrusion 130E (hereinafter referred to as the "other tangling portion 101Y1") and the tangling portion 101 other than the common tangling portion 101X supporting the protrusion 130F (hereinafter referred to as the "other tangling portion 101Y2") are arranged at the same position as each other in the longitudinal direction of the tubular portion 110. The protrusion 130E is another example of a first protrusion, the protrusion 130F is another example of a second protrusion, the other tangling portion 101Y1 is another example of a first tangling portion, and the other tangling portion 101Y2 is another example of a second tangling portion.

[0077] In this embodiment, the cylindrical portion 110 and the protruding portion 130 are continuously formed by weaving a single wire W. However, they may also be formed from separate wires W.

[0078] (Method of manufacturing the stent 10b) As described above, the stent 10b of the second embodiment is produced by hook knitting the wire W. A method for producing the stent 10b by hook knitting will be briefly described below.

[0079] 16 to 20 are explanatory diagrams showing a method for weaving a stent 10b in the second embodiment. First, similar to the procedure described in the first embodiment with reference to FIGS. 4 and 5, the worker loops the wire W zigzag between the pins PN from the starting point ST to a position corresponding to the upper end of the tubular portion 110, and then loops the wire W zigzag between the pins PN so as to form end protrusions 140, which are six V-shaped portions that protrude upward. Thereafter, the worker weaves the wire W downward until it reaches a first position P1, which is the lower end of the region of the tubular portion 110 where the protrusions 130 are located, as shown in FIG. 16.

[0080] Next, as shown in FIG. 17, the worker loops the wire W between the pins PN in a zigzag pattern so as to form twelve protrusions 130. More specifically, the worker extends the wire W diagonally upward and left from the first position P1, and then passes the wire W through the hole 11 of the entangled portion 101 to form the protrusion 130A. At this time, to ensure an excess length for lifting the protrusion 130A from the outer peripheral surface of the tubular portion 110, the wire W is made to take a detour around another pin PN before passing through the hole 11. By performing the same operation, the worker forms the protrusions 130B to 130L. When the formation of the protrusion 130L is completed, the wire W returns to the first position P1.

[0081] Next, the worker braids the remaining portion of the tubular portion 110, as shown in Figures 18 and 19. Thereafter, the worker hangs the wire W between the pins PN in a zigzag pattern so as to form end protrusions 140, which are six downwardly convex V-shaped portions, as shown in Figure 20, extends the wire W to the start point ST, and connects both ends of the wire W at the start point ST by, for example, crimping to form crimped portions 114. Through the above steps, the stent 10b before the processing of the protrusions 130 is produced.

[0082] Next, the worker uses the excess length to shape each protrusion 130 so that it floats above the outer circumferential surface of the tubular portion 110, and then performs heat treatment for shape memory. This forms the protrusions 130 that protrude outward from the tubular portion 110 when expanded. The above steps complete the production of the stent 10b of this embodiment.

[0083] (Method of using the stent 10b) An example of a method of using the stent 10b of this embodiment is as follows. First, the operator mounts the stent 10b in a contracted state on a delivery system. When the stent 10b is in the contracted state, the protrusions 130 are folded so as not to protrude outward from the tubular portion 110. Next, the operator transports the stent 10b to an indwelling position within a biological lumen using the delivery system and releases the stent 10b from the delivery system at the indwelling position. Accordingly, the stent 10b expands due to its self-expanding properties. When the stent 10b expands, the protrusions 130 protrude outward from the tubular portion 110. Therefore, the protrusions 130 come into contact with the body wall of the biological lumen and function as spacers that ensure a space between the tubular portion 110 and the body wall, for example, for the flow of bodily fluids.

[0084] (Effects of the second embodiment) As described above, the stent 10b of the second embodiment includes a tubular portion 110 and protruding portions 130. The tubular portion 110 has a first tangled portion 101A and a second tangled portion 101B in which the wires W cross each other in a hook shape and are tangled with each other. The second tangled portion 101B is disposed at a different position from the first tangled portion 101A in the longitudinal direction of the tubular portion 110. The protruding portions 130 protrude toward the outer periphery of the tubular portion 110 when the tubular portion 110 is expanded. The first protruding portion 130A, which is one of the protruding portions 130, passes through a first hole 11A formed in the first tangled portion 101A and a second hole 11B formed in the second tangled portion 101B.

[0085] The stent 10b of this embodiment can ensure a space between the tubular portion 110 and the body wall, for example, for the flow of bodily fluids, by utilizing the spacer function of the protrusions 130. The stent 10b of this embodiment can suppress a decrease in strength and durability of the tubular portion 110 that would otherwise be caused by providing the protrusions 130. The stent 10b of this embodiment can suppress movement of the first protrusions 130A because the first protrusions 130A pass through the first hole 11A and the second hole 11B, thereby preventing the above-mentioned space from being obstructed by the movement of the first protrusions 130A. The stent 10b of this embodiment can prevent the first entangled portion 101A and the second entangled portion 101B, which would otherwise make it difficult for the wires W to move relative to each other, from being aligned in the circumferential direction by the passage of the first protrusions 130A, thereby realizing a stent 10b that can be easily expanded and contracted.

[0086] In the stent 10b of this embodiment, no other entangled portion 101 exists between the first entangled portion 101A and the second entangled portion 101B in the circumferential direction of the tubular portion 110. In the stent 10b of this embodiment, the extension direction of the protruding portions 130 can be made closer to the longitudinal direction of the tubular portion 110, thereby improving the spacer function of the protruding portions 130.

[0087] (Modification of the second embodiment) Fig. 21 is a development view of a stent 10c according to a modification of the second embodiment, developed in the circumferential direction. The stent 10c according to the modification shown in Fig. 21 has ten protrusions 130 (protrusions 130A to 130J). One end of each protrusion 130 passes through a hole 11 formed in a tangled portion 101, and the other end of each protrusion 130 passes through a hole 11 formed in another tangled portion 101.

[0088] In this modification, similarly to the second embodiment, the two entanglement portions 101 supporting the protrusions 130 are disposed at different positions in the longitudinal direction of the tubular portion 110. For example, one end of one protrusion 130 (hereinafter referred to as a "first protrusion 130A") passes through a hole 11 (hereinafter referred to as a "first hole 11A") formed in one entanglement portion 101 (hereinafter referred to as a "first entanglement portion 101A"), and the other end of the first protrusion 130A passes through a hole 11 (hereinafter referred to as a "second hole 11B") formed in another entanglement portion 101 (hereinafter referred to as a "second entanglement portion 101B"). The first entanglement portion 101A in which the first hole 11A is formed and the second entanglement portion 101B in which the second hole 11B is formed are disposed at different positions in the longitudinal direction of the tubular portion 110.

[0089] In this modification, similarly to the second embodiment, the protrusions 130 other than the first protrusion 130A also have the above-described characteristics. For example, one end of one protrusion 130 (hereinafter referred to as the "second protrusion 130B") passes through the second hole 11B, and the other end of the second protrusion 130B passes through a hole 11 (hereinafter referred to as the "third hole 11C") formed in another entanglement portion 101 (hereinafter referred to as the "third entanglement portion 101C"). The second entanglement portion 101B in which the second hole 11B is formed and the third entanglement portion 101C in which the third hole 11C is formed are disposed at different positions from each other in the longitudinal direction of the tubular portion 110.

[0090] In this modification, similarly to the second embodiment, another tangled portion 101 exists between the two tangled portions 101 supporting the first protrusion 130A in the longitudinal direction of the tubular portion 110. Some of the protrusions 130 (protrusions 130B, 130D to 130J) other than the first protrusion 130A also have this characteristic. For the remaining part of the protrusions 130 (protrusion 130C), no other tangled portion 101 exists between the two tangled portions 101 supporting the protrusion 130 in the longitudinal direction of the tubular portion 110.

[0091] In this modification, similarly to the second embodiment, the two tangled portions 101 supporting the first protrusion 130A are disposed at different positions in the circumferential direction of the cylindrical portion 110. In the circumferential direction of the cylindrical portion 110, no other tangled portion 101 exists between the two tangled portions 101 supporting the first protrusion 130A. Some of the protrusions 130 other than the first protrusion 130A (protrusions 130C, 130E to 130J) also have this characteristic. For the remaining protrusions 130 (protrusions 130B, 130D), another tangled portion 101 exists between the two tangled portions 101 supporting the protrusion 130 in the circumferential direction of the cylindrical portion 110.

[0092] In this modified example, as in the second embodiment, when attention is focused on the tangling portion 101 supporting the first protrusion 130A and the second protrusion 130B, the first tangling portion 101A, the second tangling portion 101B, and the third tangling portion 101C are arranged in this order in the circumferential direction of the tubular portion 110.

[0093] The stent 10c of this modified example has a configuration similar to that of the stent 10b of the second embodiment described above, and therefore exhibits the same effects as those of the stent 10b of the first embodiment described above.

[0094] (Other variations) The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the spirit thereof, for example, the following modifications are also possible.

[0095] The configuration of the stent in the above embodiment is merely an example, and various modifications are possible. For example, the cylindrical portion of the stent does not need to have a protruding end portion.

[0096] The stent manufacturing method in the above embodiment is merely an example and can be modified in various ways. For example, in the above embodiment, the braiding method of the stent does not need to be hook braiding entirely, but may include hook braiding in part. The technology disclosed in this specification is not limited to stents made by hook braiding, but can also be applied to stents made by other braiding methods (e.g., cross braiding).

Claims

1. an expandable tubular portion (110) formed of braided wires (W), the tubular portion (110) having a first tangled portion (101A) and a second tangled portion (101B) in which the wires (W) cross each other in a hook shape and are tangled with each other, the second tangled portion (101B) being disposed at a position different from the first tangled portion (101A) in the longitudinal direction of the tubular portion (110); a first protruding portion (120A, 130A) that protrudes outward from the outer periphery of the cylindrical portion (110) when the cylindrical portion (110) is expanded, the first protruding portion (120A, 130A) passing through a first hole (11A) formed in the first entanglement portion (101A) and a second hole (11B) formed in the second entanglement portion (101B); A stent (10, 10a, 10b, 10c) comprising:

2. 2. A stent (10, 10a, 10b, 10c) according to claim 1, The stent (10, 10a, 10b, 10c), wherein the first entangled portion (101A) and the second entangled portion (101B) are arranged at different positions in the circumferential direction of the tubular portion (110).

3. A stent (10, 10a) according to claim 1 or claim 2, A stent (10, 10a), wherein the tubular portion has another entangled portion (101) between the first entangled portion (101A) and the second entangled portion (101B) in the circumferential direction of the tubular portion (110).

4. A stent (10, 10a, 10b, 10c) according to any one of claims 1 to 3, A stent (10, 10a, 10b, 10c) in which, in the longitudinal direction of the tubular portion (110), there is no other entangled portion (101) between the first entangled portion (101A) and the second entangled portion (101B).

5. A stent (10b, 10c) according to claim 1 or claim 2, A stent (10b, 10c) in which no other entangled portion (101) exists between the first entangled portion (101A) and the second entangled portion (101B) in the circumferential direction of the tubular portion (110).

6. A stent (10, 10a, 10b, 10c) according to any one of claims 1 to 3, A stent (10, 10a, 10b, 10c), wherein the tubular portion has another tangled portion (101) between the first tangled portion (101A) and the second tangled portion (101B) in the longitudinal direction of the tubular portion (110).

7. A stent (10, 10a, 10b, 10c) according to any one of claims 1 to 6, The device further includes second protrusions (120B, 130B) that protrude outward from the outer periphery of the cylindrical portion (110) when the cylindrical portion (110) is expanded, the cylindrical portion (110) has a third entanglement portion (101C) disposed at a position different from the second entanglement portion (101B) in the longitudinal direction of the cylindrical portion (110); The second protrusions (120B, 130B) pass through the second holes (11B) and the third holes (11C) formed in the third entanglement portion (101C).

8. 8. A stent (10, 10a) according to claim 7, A stent (10, 10a), wherein the first entangled portion (101A), the second entangled portion (101B), and the third entangled portion (101C) are arranged in this order in the longitudinal direction of the tubular portion (110).

9. A stent (10, 10a, 10b, 10c) according to claim 7 or 8, A stent (10, 10a, 10b, 10c) in which the first entangled portion (101A), the second entangled portion (101B), and the third entangled portion (101C) are arranged in this order in the circumferential direction of the tubular portion (110).

10. A stent (10, 10a, 10b, 10c) according to claim 7, A stent (10, 10a, 10b, 10c), wherein the first entangled portion (101A) and the third entangled portion (101C) are arranged at the same position in the longitudinal direction of the tubular portion (110).

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