JP7305256B2 - stent - Google Patents

Description

The present invention relates to stents.

Patent document 1 discloses a stent having a tubular body with an oblique mesh structure made of wires, for example.

JP 2018-175654 A

The present invention provides a stent with a novel structure.

The present invention relates to a stent having a tubular body with an oblique mesh structure made of wires,
the wire includes a first portion and a second portion;
The network structure includes a plurality of stages arranged at positions offset from each other in the axial direction of the tubular body,
The first portion includes a plurality of zigzag extending portions each extending in a range longer than one turn in the circumferential direction of the tubular body while zigzag in the axial direction at each stage,
In each zigzag extension, a first extension extending in a first inclination direction and a second extension extending in a second inclination direction opposite to the first inclination direction are alternately arranged. It has a shape that is repeatedly connected, and the end extending in the circumferential direction is connected to the zigzag extending portion of the next stage,
Each zigzag extending portion engages with the zigzag extending portion of the adjacent stage at the tip of the zigzag swing to form a hook portion,
the second extension at one end of each zigzag extension is wrapped around the second extension at the other end of the zigzag extension;
The second part provides a stent that is sequentially wrapped around the second extensions of the zigzag extensions that are arranged in an extension of each other.

Further, the present invention provides a stent having a tubular body with a mesh structure of an oblique lattice made of wires,
the wire includes a first portion and a second portion;
The network structure includes a plurality of stages arranged at positions offset from each other in the axial direction of the tubular body,
The first portion includes a plurality of zigzag extending portions each extending in a range of less than one turn in the circumferential direction of the cylindrical body while zigzag in the axial direction at each stage,
Each zigzag extending portion engages with the zigzag extending portion of the adjacent stage at its zigzag tip to form a hook portion. It is connected to the existing department,
The second portion swings zigzag in the axial direction so as to complementarily form the mesh structure with the assembly of the plurality of zigzag extension portions, and the second portion is connected to the next step in order while the cylindrical body A stent is provided which extends a plurality of times in the circumferential direction and which engages with the zigzag extending portion of the corresponding stage at the tip of the zigzag swing to form a hook portion.

Further, the present invention provides a stent having a tubular body with a mesh structure of an oblique lattice made of wires,
The wires include a first wire and a second wire,
the first wire includes a first portion and a second portion;
The network structure includes a cylindrical first structure and a second cylindrical structure that are coaxially and overlapped with each other,
The first structure is a diagonal lattice structure made up of the first wire, and includes a plurality of steps arranged at mutually displaced positions in the axial direction of the cylindrical body,
The first portions each extend in a range longer than one turn in the circumferential direction of the cylindrical body while swaying zigzag in the axial direction at each stage of the first structure. including a zigzag extension;
Each first zigzag extension includes a first extension extending in a first inclination direction and a second extension extending in a second inclination direction opposite to the first inclination direction. It has a shape that is alternately and repeatedly connected, and is connected to the first zigzag extension part of the next step in the first structure at the end extending in the circumferential direction,
Each of the first zigzag extensions engages with the first zigzag extension of the adjacent stage in the first structure at the zigzag tip to form a hook,
the second extension at one end of each first zigzag extension is wound around the second extension at the other end of the first zigzag extension;
the second portion is sequentially wound around the second extension portions of the second extension portions of the first zigzag extension portions that are arranged to extend from each other;
the second wire includes a third portion and a fourth portion;
The second structure is a diagonal lattice structure made up of the second wires, and includes a plurality of steps arranged at positions offset from each other in the axial direction of the cylindrical body,
The third portion includes a plurality of second zigzag extending portions each extending in a range of less than one turn in the circumferential direction of the tubular body while zigzagly swaying in the axial direction at each stage of the second structure. including
Each of the second zigzag extensions engages with a second zigzag extension of an adjacent stage in the second structure at its zigzag tip to form a hook, and extends in the circumferential direction. is connected to the second zigzag extending portion of the next step in the second structure,
The fourth portion swings zigzag in the axial direction so as to complementarily configure the second structure with the assembly of the plurality of second zigzag extensions, and sequentially moves to the next stage in the second structure. and extends a plurality of times in the circumferential direction of the cylindrical body while continuing to the second structure, and engages with the second zigzag extending portion of the corresponding step in the second structure at the tip of the zigzag swing to engage with the hook A stent forming a section is provided.

According to the present invention, it is possible to provide a stent with a novel structure.

It is a figure which shows the image which imaged the stent which concerns on 1st Embodiment. 1 is a schematic plan view of a stent according to a first embodiment; FIG. FIG. 4 is a schematic expanded view showing a first portion of the first structure of the stent according to the first embodiment; FIG. 4 is a schematic exploded view showing a second portion of the first structure of the stent according to the first embodiment; 1 is a schematic expanded view showing a first structure of a stent according to a first embodiment; FIG. FIG. 4 is a schematic exploded view showing a third portion of the second structure of the stent according to the first embodiment; FIG. 4 is a schematic expanded view showing a fourth portion of the second structure of the stent according to the first embodiment; FIG. 4 is a schematic expanded view showing a second structure of the stent according to the first embodiment; FIG. 2 is a schematic expanded view showing a braided structure of a first structure and a second structure of the stent according to the first embodiment; 1 is a schematic cross-sectional view of a stent according to a first embodiment; FIG. It is a figure which shows the image which imaged the stent which concerns on 4th Embodiment. FIG. 11 is a schematic cross-sectional view of a stent according to a fourth embodiment; FIG. 13(a) is a schematic cross-sectional view of a stent according to a fifth embodiment, and FIG. 13(b) is a schematic plan cross-sectional view of a stent according to a fifth embodiment. FIG. 14(a) is a schematic cross-sectional view of a stent according to a sixth embodiment, and FIG. 14(b) is a schematic plan cross-sectional view of a stent according to a sixth embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted.

[First embodiment]
First, a first embodiment will be described with reference to FIGS. 1 to 10. FIG.
In FIG. 2, a part (twisted wire part 39) of the first wire 31 constituting the first structure 11 (FIG. 5) of the mesh structure 10a of the cylindrical body 10 is wound around the other part. , are shaded.
FIG. 3 shows the shape of the structure formed by the first parts 32 of the first wires 31 in the first structure 11 of the mesh structure 10a when flattened. Actually, the structure shown in FIG. 3 is formed in a tubular shape whose axial direction is the vertical direction in FIG. That is, in FIG. 3, the horizontal direction is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 3 continues to the left end.
Similarly, FIG. 4 shows the shape of the structure formed by the second portions 33 of the first wires 31 in the first structure 11 of the mesh structure 10a when flattened. Actually, the structure shown in FIG. 4 is formed in a tubular shape whose axial direction is the vertical direction in FIG. The horizontal direction in FIG. 4 is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 4 continues to the left end. In addition, in FIG. 4, the first portion 32 (structure shown in FIG. 3) is indicated by a two-dot chain line.
Similarly, FIG. 5 shows the shape when the first structure 11 of the mesh structure 10a is flattened. Actually, the structure shown in FIG. 5 is formed in a tubular shape whose axial direction is the vertical direction in FIG. The horizontal direction in FIG. 5 is the circumferential direction of the first structure 11, and the right end of the structure shown in FIG. 5 continues to the left end.
Similarly, FIG. 6 shows the shape of the structure formed by the third portions 42 of the second wires 41 in the second structure 12 (FIG. 8) of the mesh structure 10a when flattened. Actually, the structure shown in FIG. 6 is formed in a tubular shape whose axial direction is the vertical direction in FIG. The horizontal direction in FIG. 6 is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 6 continues to the left end.
Similarly, FIG. 7 shows the shape of the structure formed by the fourth portion 43 of the second wire 41 in the second structure 12 of the mesh structure 10a when flattened. Actually, the structure shown in FIG. 7 is formed in a tubular shape whose axial direction is the vertical direction in FIG. The horizontal direction in FIG. 7 is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 7 continues to the left end. 7, the third portion 42 (the structure shown in FIG. 6) is indicated by a two-dot chain line.
Similarly, FIG. 8 shows the shape when the second structure 12 of the mesh structure 10a is flattened. Actually, the structure shown in FIG. 8 is formed in a tubular shape whose axial direction is the vertical direction in FIG. The horizontal direction in FIG. 8 is the circumferential direction of the second structure 12, and the right end of the structure shown in FIG. 8 continues to the left end.
Similarly, FIG. 9 shows the shape of the mesh structure 10a when it is flattened out. Actually, the mesh structure 10a is formed in a cylindrical shape whose axial direction is the vertical direction in FIG. The horizontal direction in FIG. 9 is the circumferential direction of the mesh structure 10a, and the right end of the structure shown in FIG. 9 continues to the left end.

Note that the axial directions of the cylindrical body 10, the mesh structure 10a, the first structure 11 and the second structure 12 are aligned with each other, and in the following description, these axial directions may be simply referred to as axial directions without distinction. be.
Similarly, the circumferential directions of the cylindrical body 10, the mesh structure 10a, the first structure 11, and the second structure 12 match each other, and in the following description, these circumferential directions are simply referred to as circumferential directions without distinction. There is

As shown in FIGS. 1 and 2, a stent 100 according to this embodiment has a tubular body 10 of a diagonal grid-like mesh structure 10a made of wires.
The stent 100 includes, as wires, a first wire 31 (FIGS. 2 to 5) and a second wire 41 (FIGS. 2 and 6 to 8). The first wire 31 includes a first portion 32 (Fig. 3) and a second portion 33 (Figs. 4 and 5).
The network structure 10a includes tubular first structures 11 (FIG. 5) and tubular second structures 12 (FIG. 8) arranged coaxially and overlapping each other.
As shown in FIG. 5, the first structure 11 is formed of a first wire 31 and has a slanted lattice shape. 13 (FIGS. 3-5).
The first portions 32 each extend in the circumferential direction of the tubular body 10 over a range longer than one turn while swaying zigzag in the axial direction at each step 13 of the first structure 11 . It includes a zigzag extension 34 (Fig. 3).
As shown in FIG. 3, each of the first zigzag extending portions 34 includes a first extending portion 35 extending in a first inclination direction (rightward upward direction in FIG. 3) and a first extension portion 35 extending in an opposite direction to the first inclination direction. The second extending portion 36 extending in the second inclined direction (lower right direction in FIG. 3) and the second extending portion 36 are alternately connected to each other. is connected to the first zigzag extending portion 34 of the .
Each first zigzag extension 34 engages with the first zigzag extension 34 of the adjacent step 13 in the first structure 11 at its zigzag tip to form a hook portion 37 .
A second extension portion 36 at one end of each first zigzag extension portion 34 (a second extension portion 36a shown in FIG. 3) is a wrapped around it. In other words, the second extension portions 36 form a twisted wire (twisted wire portion 39).
As shown in FIGS. 4 and 5, the second portion 33 is formed around the second extending portions 36 of the second extending portions 36 of the first zigzag extending portions 34 that are arranged on extension of each other. They are wrapped sequentially. In other words, the second extending portion 36 and the second portion 33 also constitute a twisted wire (twisted wire portion 39).
The second wire 41 includes a third portion 42 (Fig. 6) and a fourth portion 43 (Figs. 7 and 8).
As shown in FIG. 8, the second structure 12 is formed of second wires 41 and has a slanted lattice shape. 14 (FIGS. 6-8).
As shown in FIG. 6, the third portions 42 each extend in a range of less than one turn in the circumferential direction of the cylindrical body 10 while zigzag in the axial direction at each step 14 of the second structure 12 . includes a second zigzag extension 44 of .
Each of the second zigzag extensions 44 engages with the second zigzag extensions 44 of the adjacent step 14 in the second structure 12 at the tip of the zigzag swing to form a hook portion 47. , and continues to the second zigzag extension 44 of the adjacent step 14 in the second structure 12 .
As shown in FIG. 7, the fourth portion 43 is axially aligned so as to compose the second structure 12 (FIG. 8) complementary to the assembly of the plurality of second zigzag extensions 44 (see FIG. 6). It extends in the circumferential direction of the cylindrical body 10 a plurality of times while swaying in a zigzag manner and successively connecting to the next step 14 in the second structure 12 , and at the end of the zigzag swaying, the corresponding one in the second structure 12 . The second zigzag extension 44 of step 14 engages with each other to form a hook portion 48 .

According to this embodiment, the stent 100 having such a novel structure can be provided.
More specifically, the mesh structure 10a of the tubular body 10 of the stent 100 includes a first structure 11 and a second structure 12. As shown in FIG.
Since the first structure 11 has a structure in which the first zigzag extending portions 34 of the steps 13 are engaged with each other at the hook portions 37 at the tip of the zigzag swing, the first structure 11 has good shape retention. Here, when the stent 100 is radially compressed, the fact that the stent 100 has good shape retention means that the stent 100 has sufficient radial force to radially expand (restore). be. Since the first zigzag extending portion 34 of each step 13 extends one turn in the circumferential direction of the cylindrical body 10 while swaying in a zigzag manner, the substantially entire area of the first structure 11 is evenly and sufficiently provided. Shape retention can be achieved. Moreover, since the second extension portion 36 at one end of each first zigzag extension portion 34 is wound around the second extension portion 36 at the other end of each first zigzag extension portion 34, the first structure 11 has even better shape retention. have In addition, the second portion 33 of the first wire 31 that constitutes the first structure 11 has second extension portions 36 of the first zigzag extension portions 34 that are arranged on extensions of each other. Since it is sequentially wrapped around the portion 36, the first structure 11 has better shape retention.
Since the second structure 12 has a structure in which the second zigzag extending portions 44 of the steps 14 are engaged with each other at the hook portions 47 at the tip of the zigzag swing, it has good shape retention. Moreover, since the fourth portion 43 of the second wire 41 constituting the second structure 12 is engaged with each of the second zigzag extending portions 44 at the hook portion 48 at the tip of the zigzag swing, the second structure 12 has even better shape retention. In addition, since the fourth portion 43 composes the oblique lattice-like second structure 12 complementarily with the assembly of the plurality of second zigzag extending portions 44, the second structure 12 is evenly distributed over the entire area. Sufficient shape retention can be achieved.
Thus, according to the present embodiment, the stent 100 can achieve good shape retention.
In the case of the present embodiment, since the first extension portions 35 of the first structure 11 are not twisted except for a part of the first extension portions 35, the stent 100 has sufficient flexibility. have. Here, that the stent 100 has flexibility means that the axial force is moderately small.

A more detailed description will be given below.

In this embodiment, the first wire 31 is one wire. The first portion 32 is a portion of the first wire 31 in the longitudinal direction, and the second portion 33 is the remaining portion of the first wire 31 in the longitudinal direction.
Similarly, the second wire 41 is one wire, the third portion 42 is a portion of the second wire 41 in the longitudinal direction, and the fourth portion 43 is the remaining portion of the second wire 41 in the longitudinal direction. .
The material of the first wire 31 and the second wire 41 is not particularly limited, and may be a metal material or a resin material.
Although the wire diameter (outer diameter) of the first wire 31 and the second wire 41 is not particularly limited, it is preferably 0.05 mm or more and 0.5 mm or less, for example.

As shown in FIG. 10, the cylindrical body 10 is, for example, cylindrical.
As described above, the mesh structure 10a includes tubular first structures 11 (Fig. 5) and second structures 12 (Fig. 8), respectively. Among them, the first structure 11 is composed of the first wire 31 , and the second structure 12 is composed of the second wire 41 .
The first structure 11 and the second structure 12 are arranged coaxially and overlapping each other. In this embodiment, the first structure 11 and the second structure 12 are braided together. Therefore, positional deviation between the first structure 11 and the second structure 12 can be suppressed in the axial direction, and separation between the first structure 11 and the second structure 12 can be suppressed in the radial direction.

In the case of this embodiment, since the first structure 11 and the second structure 12 are braided together, one of the first structure 11 and the second structure 12 is arranged on the outer peripheral side, and the other is arranged on the inner peripheral side. There is no positional relationship that is being done. However, the present invention is not limited to this example, and the mesh structure 10a has a double tubular structure in which one of the first structure 11 and the second structure 12 is arranged on the outer peripheral side and the other is arranged on the inner peripheral side. (Alternatively, it may be a triple or more structure including layers other than the first structure 11 and the second structure 12).

The first structure 11 will be described in detail below with reference to FIGS. 3 to 5. FIG.
First, the structure of the portion of the first structure 11 that is configured by the first portion 32 of the first wire 31 will be described in detail with reference to FIG.
As shown in FIG. 3 , the first portion 32 of the first wire 31 forming the first structure 11 includes a plurality of first zigzag extensions 34 .
One first zigzag extension 34 is arranged for each step 13 of the first structure 11 .
Each first zigzag extending portion 34 has a first extending portion 35 extending in a first inclined direction (rightward upward direction in FIG. 3) and a second inclined direction opposite to the first inclined direction ( 3) are alternately and repeatedly connected to each other.
In the example of FIG. 3 , the uppermost first zigzag extension 34 includes two first extensions 35 and two second extensions 36 .
The first zigzag extensions 34 in the second and subsequent stages from the top include five first extensions 35 and six second extensions 36 . In the case of this embodiment, in the second and subsequent first zigzag extensions 34, the portion including the five first extensions 35 and the five second extensions 36 corresponds to one turn of the first structure 11. is equivalent to In other words, the first zigzag extending portion 34 on the second and subsequent stages from the top has one second extending portion 36 in addition to the portion extending over one round of the first structure 11 . That is, the first zigzag extending portion 34 of each stage 13 after the second stage extends over a range longer than one round.
The number of the first extending portions 35 and the second extending portions 36 in the first zigzag extending portion 34 of each stage 13 depends on the diameter of the stent 100 and the desired fineness of the mesh structure 10a. can be changed.
The first zigzag extending portions 34 of adjacent steps 13 have shapes that are mutually inverted in the axial direction. That is, in FIG. 3, the odd-numbered first zigzag extensions 34 counted from the top alternately include the first extensions 35 and the second extensions 36 in order from the left. , the even-numbered first zigzag extensions 34 counted from the top alternately include the second extensions 36 and the first extensions 35 in order from the left.

In FIG. 3 , the first portion 32 extends a plurality of times from one end 32 a as a starting point while sequentially changing the steps 13 .
The uppermost first zigzag extending portion 34 extends in the circumferential direction with the first extending portion 35 at the left end serving as a base end. The rightmost (that is, terminal) second extension 36 of the first zigzag extension 34 at the top is the third second extension from the left of the first zigzag extension 34 at the second stage from the top. It continues to the part 36 .
The first zigzag extending portion 34 on the second stage from the top extends in the circumferential direction with the second extending portion 36 on the third from the left as a base end. The second extending portion 36 at the end of the first zigzag extending portion 34 on the second stage from the top is wound around the second extending portion 36 at the proximal end of the first zigzag extending portion 34 . The second extending portion 36 at the end of the first zigzag extending portion 34 on the second stage from the top is the third second extending portion 36 from the left in the first zigzag extending portion 34 on the third stage from the top. connected to
The third first zigzag extending portion 34 from the top extends in the circumferential direction with the second extending portion 36 third from the left as a base end. A second extending portion 36 at the end of the first zigzag extending portion 34 on the third stage from the top is wound around the second extending portion 36 at the proximal end of the first zigzag extending portion 34 . The second extending portion 36 at the end of the first zigzag extending portion 34 on the third stage from the top is the fourth second extending portion 36 from the left in the first zigzag extending portion 34 on the fourth stage from the top. connected to
The fourth first zigzag extending portion 34 from the top extends in the circumferential direction with the fourth second extending portion 36 from the left serving as a base end. A second extension portion 36 at the end of the first zigzag extension portion 34 on the fourth stage from the top is wound around the second extension portion 36 at the base end of the first zigzag extension portion 34 . The second extending portion 36 at the end of the first zigzag extending portion 34 on the fourth stage from the top is the fourth second extending portion 36 from the left in the first zigzag extending portion 34 on the fifth stage from the top. connected to
The fifth first zigzag extending portion 34 from the top extends in the circumferential direction from the fourth second extending portion 36 from the left. A second extension portion 36 at the end of the first zigzag extension portion 34 on the fifth stage from the top is wound around the second extension portion 36 at the base end of the first zigzag extension portion 34 . The second extending portion 36 at the end of the first zigzag extending portion 34 on the fifth stage from the top is the fifth second extending portion 36 from the left in the first zigzag extending portion 34 on the sixth stage from the top. connected to
Similarly, the first zigzag extension portions 34 of each stage 13 are successively connected, and the second extension portion 36a at one end of the first zigzag extension portion 34 of each stage 13 extends from the first zigzag extension. It is wrapped around a second extension portion 36 at the other end of the portion 34 .

Here, the portion where the corner portion of the boundary between the first extension portion 35 and the second extension portion 36 is convex upward in FIG. and the second extending portion 36 is called a trough portion in FIG.
The uppermost first zigzag extension portion 34 has a structure corresponding to two mountains, and the first zigzag extension portions 34 at the second and subsequent stages have a structure corresponding to five mountains.

As described above, each first zigzag extending portion 34 engages with the first zigzag extending portion 34 of the adjacent stage at the zigzag tip to form the hook portion 37 .
In each hook portion 37, the trough portion of one first zigzag extension portion 34 and the peak portion of the other first zigzag extension portion 34 are loop-shaped. The trough portion of one first zigzag extension portion 34 and the peak portion of the other first zigzag extension portion 34 pass through each other's loops, and the direction of extension is reversed, so that the hook portion 37 is formed.
Each trough portion of the first zigzag extension portion 34 of each step 13 engages with each peak portion of the first zigzag extension portion 34 one step below to form a hook portion 37 .

Here, a portion formed by winding a portion of the first wire 31 around another portion of the first wire 31 is referred to as a stranded wire portion 39 .
A portion configured by winding a second extension portion 36a at one end of the first zigzag extension portion 34 around the second extension portion 36 of the first zigzag extension portion 34 is a stranded wire portion. 39.
As described above, the first zigzag extending portions 34 on the second and subsequent stages from the top extend over a range corresponding to one turn plus one second extending portion 36 . A twisted wire portion 39 is formed by winding a second extension portion 36 a at one end of the first zigzag extension portion 34 around the second extension portion 36 of the first zigzag extension portion 34 . . Therefore, as shown in FIG. 3, the stranded wire portions 39 in each stage formed by the first portion 32 are arranged so as to extend from each other and are connected obliquely. That is, the stranded wire portions 39 of each stage are connected in a spiral manner.

For example, as shown in FIG. 3, the other end 32b of the first portion 32 forms, for example, a twisted wire portion 39 between the second extension portions 36 of the first zigzag extension portion 34 at the lowest stage, and a turn-back point. After the first portion 32 is folded back at 32c, it exists at a point where the first extending portion 35 for one portion is further extended.
In addition, the first extending portion 35 including the other end 32b of the first portion 32 has a lowermost first zigzag extending portion 34 that extends around the first extending portion 35 corresponding to the first extending portion 35. to form a stranded wire portion 39 .
The other end 32b of the first portion 32 is tied to the hook portion 37, for example.

Next, the structure of the portion of the first structure 11 of the mesh structure 10a that is configured by the second portions 33 of the first wires 31 will be described with reference to FIG.
In FIG. 4, the second portion 33 starts at one end 33a. One end 33 a of the second portion 33 is the same as the one end 32 a of the first portion 32 . That is, in the first wire 31, one portion bounded by one end 32a (one end 33a) is the first portion 32 (the two-dot chain line portion in FIG. 4), and the other portion is the second portion 33 (the 4).
The second portion 33 first forms a zigzag extending portion 33c for three mountains toward the left from one end 33a. The troughs of the zigzag extension 33c form hooks 37 by engaging with the peaks of the first zigzag extension 34 on the second stage from the top.
A twisted wire portion 39 is formed by winding the second portion 33 around the first zigzag extension portion 34 by one mountain in the left direction starting from the terminal end 33d of the zigzag extension portion 33c.
A winding portion 38 (a winding portion 38 a shown in FIG. 4 ) is formed by winding the second portion 33 around the hook portion 37 at the terminal end of the twisted wire portion 39 .
With this winding portion 38a as a boundary, the extending direction of the second portion 33 is switched from the left downward direction to the right downward direction.

At the tip of the winding portion 38a, the second portion 33 is sequentially wound around the second extension portions 36 of the second extension portions 36 of the first zigzag extension portions 34 that are arranged on extension of each other. It is
In the second portion 33, the tip of the winding portion 38a extends downward to the right from the winding portion 38a while being wound around each second extension portion 36 to form a twisted wire portion 39, It reaches an intermediate point 33e shown at the right end in FIG. This intermediate point 33e is also shown at the left end in FIG.
The second portion 33 continues to extend downward to the right from the leftmost intermediate point 33e in FIG. to the hook portion 37 on the right end.
The second portion 33 is wound around the hook portion 37 to form a winding portion 38 . With this winding portion 38 as a boundary, the extending direction of the second portion 33 is switched from the direction downward to the right to the direction downward to the left.
Furthermore, after the second portion 33 is wound around one first extending portion 35 of the lowermost first zigzag extending portion 34 and reaches the valley portion of the first zigzag extending portion 34, The direction of extension is switched from the downward-left direction to the upward-left direction.
Subsequently, the second portion 33 is successively wound around the second extending portions 36 extending from each other to reach an intermediate point 33f shown at the left end in FIG. This intermediate point 33f is also shown at the right end in FIG.
The second portion 33 continues to extend upward to the left from the rightmost intermediate point 33f in FIG. 4 and is wound around each of the second extension portions 36 to reach the leftmost intermediate point 33g in FIG. This intermediate point 33g is also shown at the right end in FIG.
The second portion 33 continues to be wound around one mountain portion at the right end of the zigzag extension portion 33c. The extending direction of the second portion 33 is switched from an upward left direction to a downward left direction in the process of being wound around one peak of the zigzag extending portion 33c.
The second portion 33 is wound around one mountain portion at the right end of the zigzag extending portion 33 c and then wound around the hook portion 37 to form a winding portion 38 . With this winding portion 38 as a boundary, the extending direction of the second portion 33 is switched from the left downward direction to the right downward direction.
Subsequently, the second portion 33 is successively wound around the second extension portions 36 extending from each other and reaches an intermediate point 33h shown at the right end in FIG. This intermediate point 33h is also shown at the left end in FIG.
The second portion 33 continues to extend downward to the right from the leftmost intermediate point 33h in FIG. This intermediate point 33i is also shown at the left end in FIG.
Subsequently, the second portion 33 is sequentially wound around the second extending portions 36 extending from each other, and reaches the hook portion 37 at the bottom in FIG. The second portion 33 is wound around the hook portion 37 to form a winding portion 38 . With this winding portion 38 as a boundary, the extending direction of the second portion 33 is switched from the direction downward to the right to the direction downward to the left.
Furthermore, after the second portion 33 is wound around one first extending portion 35 of the lowermost first zigzag extending portion 34 and reaches the valley portion of the first zigzag extending portion 34, The direction of extension is switched from the downward-left direction to the upward-left direction.
Subsequently, the second portion 33 is sequentially wound around the second extending portions 36 arranged to extend from each other, and reaches an intermediate point 33j shown at the left end in FIG. This intermediate point 33j is also shown at the right end in FIG.
The second portion 33 continues to extend upward to the left from the rightmost intermediate point 33j in FIG. 4 and is wound around each of the second extension portions 36 to reach the leftmost intermediate point 33k in FIG. This intermediate point 33k is also shown at the right end in FIG.
Subsequently, the second portion 33 is successively wound around the second extending portions 36 arranged to extend from each other, then is wound around one mountain portion at the left end of the zigzag extending portion 33c, and is wound around the other end 33b. reach. The other end 33b is tied to the first portion 32, for example.
One end 32 a is one end of the first wire 31 , and the other end 33 b is the other end of the first wire 31 .

In this way, the second portion 33 includes the winding portion 38 wound around the hook portion 37 with which the first zigzag extension portions 34 are engaged. The extension direction is switched. Therefore, the second portion 33 can be wound around the first portion 32 while extending in various directions while suppressing the positional deviation of the second portion 33 with respect to the first portion 32 .

Here, as shown in FIG. 5, portions of the second portion 33 extend parallel to each other in portions other than both ends (ends 15a and 15b shown in FIG. 5 and the like) of the mesh structure 10a in the axial direction. ing. That is, in FIG. 5, in the portions other than both end portions in the axial direction of the network structure 10a, each portion of the second portion 33 is wound around the second extension portion 36, and is downwardly directed to the right (second inclination). direction). That is, in FIG. 5, since each portion of the second portion 33 does not include a portion extending in the upward rightward direction (first inclination direction) in portions other than both end portions in the axial direction of the mesh structure 10a, Stent 100 can also be moderately deformable.
In other words, in portions other than both end portions in the axial direction of the mesh structure 10a, the twisted wire portion 39 extends downward to the right and does not include the twisted wire portion 39 extending in the upward direction. , the stent 100 can be sufficiently flexible.

The first structure 11 is configured as described above.

The second structure 12 will be described in detail below with reference to FIGS. 6 to 8. FIG.
First, with reference to FIG. 6, the structure of the portion of the second structure 12 that is configured by the third portion 42 of the second wire 41 will be described in detail.
As shown in FIG. 6 , the third portion 42 of the second wire 41 forming the second structure 12 includes a plurality of second zigzag extensions 44 .
One second zigzag extension 44 is arranged for each step 14 of the second structure 12 .
Each of the second zigzag extending portions 44 includes a first extending portion 45 extending in a third inclined direction (rightward upward direction in FIG. 6) and a fourth inclined direction opposite to the third inclined direction (in FIG. 6). 6) are alternately and repeatedly connected.
In the example of FIG. 6 , the uppermost second zigzag extension 44 includes five second extensions 46 and four first extensions 45 . The lowermost second zigzag extending portion 44 includes five second extending portions 46 and five first extending portions 45 . The other second zigzag extensions 44 of each stage 14 are configured to include four second extensions 46 and four first extensions 45 .
In the example of FIG. 6 , five second extensions 46 and five first extensions 45 correspond to one turn of the second structure 12 . Therefore, each of the second zigzag extending portions 44 other than the lowest stage extends over a range of less than one turn.

In FIG. 6, the third portion 42 extends a plurality of times from one end 42a while changing the steps 14 sequentially.
The uppermost second zigzag extending portion 44 extends in the circumferential direction with a second extending portion 46 including one end 42a as a base end. A second extending portion 46 at the end of the uppermost second zigzag extending portion 44 is shown at the left end in FIG. The terminal second extension portion 46 of the uppermost second zigzag extension portion 44 continues to the leftmost second extension portion 46 of the second zigzag extension portion 44 of the second stage from the top.
The rightmost second extending portion 46 of the second zigzag extending portion 44 on the second stage from the top continues to the second extending portion 46 of the second zigzag extending portion 44 on the third stage from the top.
Similarly, from the second zigzag extending portion 44 on the third stage from the top to the second zigzag extending portion 44 on the second stage from the bottom, each stage 14 sways zigzag in the axial direction and extends in the circumferential direction. The tip of the second zigzag extending portion 44 in the adjacent stage is connected to the second extending portion 46 of the second zigzag extending portion 44 of the adjacent stage.

Here, the portion where the corner of the boundary between the first extension portion 45 and the second extension portion 46 is convex upward in FIG. and the second extending portion 46 is called a trough portion in FIG.
The uppermost second zigzag extending portion 44 has a structure of 4.5 peaks. From the second zigzag extending portion 44 on the second stage from the top to the second zigzag extending portion 44 on the second stage from the bottom, each has a structure corresponding to 3.5 mountains. The lowermost second zigzag extending portion 44 has a structure of five peaks.

In this way, the first zigzag extensions 34 of the portions other than both ends of the mesh structure 10a are more stable than the first zigzag extensions 34 of both ends (ends 15a and 15b) of the mesh structure 10a. The number of zigzag swings in
In addition, the number of zigzag deflections of the first zigzag extending portions 34 is equal to each other in the portions other than the two end portions of the network structure 10a.

As described above, each second zigzag extending portion 44 engages with the second zigzag extending portion 44 of the adjacent stage at the zigzag tip to form the hook portion 47 .
In each hook portion 47, the valley portion of one second zigzag extension portion 44 and the peak portion of the other second zigzag extension portion 44 are loop-shaped. The troughs of one of the second zigzag extensions 44 and the peaks of the other of the second zigzag extensions 44 pass through each other's loops, and the direction of extension is reversed, so that the hooks 47 is formed.
Of the troughs of the second zigzag extension 44 of each step 14, the troughs at positions corresponding to the peaks of the second zigzag extension 44 on the lower stage are They are engaged to form a hook portion 47 .

The other end 42b of the third portion 42 is positioned, for example, on the extension of the first extending portion 45 at the right end of the second zigzag extending portion 44 at the lowest stage, and is located on the second zigzag extending portion 44 at the second stage from the bottom. It is connected to the hook portion 47 of the existing portion 44 and the second zigzag extending portion 44 on the third stage from the bottom.

As shown in FIG. 6 , the portion of the second structure 12 that is configured by the third portion 42 of the second wire 41 is formed in a diagonal grid shape with partial blanks.

Next, the structure of the portion of the second structure 12 of the mesh structure 10a that is configured by the fourth portion 43 of the second wire 41 will be described with reference to FIG.
In FIG. 7, the fourth portion 43 starts at one end 43a. One end 43a of the fourth portion 43 and one end 42a of the third portion 42 are the same. That is, in the second wire 41, one portion bounded by the one end 42a (one end 33a) is the third portion 42 (the two-dot chain line portion in FIG. 7), and the other portion is the fourth portion 43 (the 7).
As described above, the fourth portion 43 has the oblique lattice-like second structure 12 (FIG. 8) complementarily to the assembly of the plurality of second zigzag extending portions 44 (the two-dot chain line portion in FIG. 7). It is extended so that it constitutes. That is, the fourth portion 43 oscillates zigzag in the axial direction and extends a plurality of times in the circumferential direction while being successively connected to the adjacent steps 14 in the second structure 12 . The fourth portion 43 engages with the second zigzag extending portion 44 at the zigzag tip to form a hook portion 48 .
In each hook portion 48, the peaks or valleys of the fourth portion 43 and the peaks or valleys of the second zigzag extension portion 44 are each formed in a loop shape, pass through each other's loops, and , the direction of extension is reversed.

More specifically, the zigzag shape of the fourth portion 43 is such that the first extension portion 49 extends obliquely by two steps, and the first extension portion 49 extends from the first extension portion 49 to the first extension portion 49 . It is a shape in which the second extending portions 50 that are folded back in the opposite oblique direction and extend obliquely by one stage are alternately and repeatedly connected.
In FIG. 7, the first extending portion 49 extends downward to the left, and the second extending portion 50 extends upward to the left.

The number of the first extending portions 45 and the second extending portions 46 in the second zigzag extending portions 44 of each stage 14 of the second structure 12 is determined according to the diameter of the stent 100 and the desired fineness of the mesh structure 10a. can be changed according to
On the other hand, the zigzag shape of the fourth portion 43 of the second structure 12 is, for example, a constant shape regardless of the diameter of the stent 100 (a first extending portion 49 extending obliquely by two steps and a first extending portion 49 is folded back in a diagonal direction opposite to that of the first extension portion 49, and the second extension portion 50 extends diagonally by one step, and the second extension portion 50 is alternately connected. can be done.

The other end 43 b of the fourth portion 43 is tied to the hook portion 47 .
The one end 42 a is one end of the second wire 41 and the other end 43 b is the other end of the second wire 41 .

The second structure 12 is configured as described above.

Here, in the case of this embodiment, the first structure 11 and the second structure 12 are braided together as described above.
More specifically, as shown in FIG. 9, the second zigzag extending portion 44 alternately passes through the outer surface side and the inner surface side of the first wire 31 every time it swings in a zigzag manner. The structure 11 and the second structure 12 are braided together.
9, the first structure 11 (FIG. 5) configured by the first wire 31 is shown in a simplified manner, and each hook portion in the first structure 11 is not shown. The formation range of the portion 39 is indicated by hatching.

As shown in FIG. 9, the mesh size in the first structure 11 and the mesh size in the second structure 12 are preferably equal to each other.
In addition, it is preferable that the meshes in the first structure 11 and the meshes in the second structure 12 are displaced from each other in the circumferential direction. preferable.

As shown in FIG. 1, the tubular body 10 is provided with radiopaque markers 63 . The marker 63 is configured by, for example, winding a fine wire such as gold in a coil shape, and is externally inserted on the first wire 31 or the second wire 41 .
The markers 63 are provided, for example, at one or both ends of the cylindrical body 10 in the axial direction. Also, the markers 63 may be provided at a plurality of positions in the circumferential direction of the tubular body 10 .

The procedure for fabricating the network structure 10a constituting the stent 100 is not particularly limited, but for example, the network structure 10a is obtained by fabricating the first structure 11 first and then fabricating the second structure 12.
The first structure 11 may be produced by knitting in order from one end (one end 32a) of the first wire 31, or may be produced by knitting in order from the other end (other end 33b) of the first wire 31. good too.
Similarly, the second structure 12 may be produced by knitting sequentially from one end (one end 42a) of the second wire 41, or by knitting sequentially from the other end (other end 43b) of the second wire 41. may be made.

[Second embodiment]
Next, a second embodiment will be described.
In the above-described first embodiment, an example in which the mesh structure 10a includes the first structure 11 and the second structure 12 has been described. , and selectively includes the first structure 11 ( FIG. 5 ) of the first structure 11 and the second structure 12 .

That is, the stent 100 according to the present embodiment is a stent 100 having a tubular body 10 of a diagonal grid-like mesh structure 10a made of wires (first wires 31). includes a first portion 32 and a second portion 33, the mesh structure 10a includes a plurality of steps 13 that are arranged at offset positions in the axial direction of the tubular body 10, and the first portion 32 includes: A plurality of zigzag extensions (the first zigzag extensions described above) each extend over a range longer than one turn in the circumferential direction of the cylindrical body 10 while zigzag in the axial direction at each step 13 34), and each zigzag extension (first zigzag extension 34) includes a first extension 35 extending in a first inclination direction and a second inclination direction opposite to the first inclination direction. and the second extending portion 36 extending in the direction of the circumference are alternately connected to each other. Each zigzag extending portion (first zigzag extending portion 34) engages with the adjacent zigzag extending portion (first zigzag extending portion 34) at the point of zigzag swing to form a hook portion. A second extension 36 at one end of each zigzag extension (first zigzag extension 34) is formed at the other end of the zigzag extension (first zigzag extension 34). The second portion 33 is wound around the second extension 36, and the second portions 33 of the second extensions 36 of the respective zigzag extensions (first zigzag extensions 34) are arranged so as to extend from each other. are sequentially wound around the second extension portion 36 .

According to this embodiment, the stent 100 having such a novel structure can be provided.
More specifically, the mesh structure 10a of the tubular body 10 of the stent 100 has a structure in which the first zigzag extending portions 34 of the respective stages 13 are engaged with each other at the hook portions 37 at the tip of the zigzag swing. Therefore, it has good shape retention. Since the first zigzag extending portion 34 of each step 13 extends one turn in the circumferential direction of the cylindrical body 10 while swinging in a zigzag manner, the net structure 10a is evenly and sufficiently maintained substantially over the entire area. form can be realized. Moreover, since the second extension portion 36 at one end of each first zigzag extension portion 34 is wound around the second extension portion 36 at the other end of each first zigzag extension portion 34, the mesh structure 10a has even better shape retention. have. In addition, the second portions 33 of the first wires 31 forming the mesh structure 10a are the second extension portions of the second extension portions 36 of the first zigzag extension portions 34 that are arranged on extensions of each other. Since it is sequentially wound around 36, the mesh structure 10a has better shape retention.
Also in the case of the present embodiment, since the first extension portions 35 of the first structure 11 are not stranded except for a part of the first extension portions 35, the stent 100 has sufficient flexibility. have
Thus, according to this embodiment as well, the stent 100 can have both shape retention and flexibility.

[Third embodiment]
Next, a third embodiment will be described.
In the above-described first embodiment, an example in which the mesh structure 10a includes the first structure 11 and the second structure 12 has been described. , and selectively includes the second structure 12 ( FIG. 7 ) out of the first structure 11 and the second structure 12 .

That is, the stent 100 according to the present embodiment is a stent 100 having a tubular body 10 of a mesh structure 10a in the form of an oblique lattice made of wires (second wires 41). includes a first portion (the above-described third portion 42) and a second portion (the above-described fourth portion 43), and the mesh structure 10a is arranged at positions offset from each other in the axial direction of the cylindrical body 10. The first portion (the third portion 42) extends in the circumferential direction of the tubular body 10 within a range of less than one turn while zigzag in the axial direction at each step 13. A plurality of zigzag extensions (the above-described second zigzag extensions 44) are included, and each zigzag extension (the second zigzag extensions 44) is the zigzag extension of the next step 14 at the zigzag tip. (second zigzag extension portion 44) to form a hook portion 47, and the zigzag extension portion (second zigzag extension portion 44) of the adjacent step 14 at the end extending in the circumferential direction. ), and the second portion (fourth portion 43) extends in the axial direction so as to compose the mesh structure 10a complementarily with the assembly of the plurality of zigzag extension portions (second zigzag extension portions 44). The zigzag extending portion (second The zigzag extension 44) engages with each other to form a hook portion 48. As shown in FIG.

According to this embodiment, the stent 100 having such a novel structure can be provided.
More specifically, the mesh structure 10a of the tubular body 10 of the stent 100 has a structure in which the second zigzag extending portions 44 of the respective stages 14 are engaged with each other at the hook portions 47 at the tip of the zigzag swing. Therefore, it has good shape retention. Moreover, since the fourth portion 43 of the second wire 41 constituting the mesh structure 10a is engaged with each of the second zigzag extending portions 44 at the hook portion 48 at the tip of the zigzag swing, the mesh structure 10a is further Has good shape retention. In addition, since the fourth portion 43 composes the diagonal grid-like mesh structure 10a complementarily with the assembly of the plurality of second zigzag extending portions 44, the entire mesh structure 10a is evenly and sufficiently Shape retention can be achieved.
Unlike the first structure 11, the second structure 12 does not include the twisted wire portion 39, so the stent 100 has sufficient flexibility.
Thus, according to this embodiment as well, the stent 100 can have both shape retention and flexibility.

[Fourth embodiment]
Next, 4th Embodiment is described using FIG.11 and FIG.12.
As shown in FIGS. 11 and 12, the tubular body 10 of the stent 100 according to this embodiment has a structure in which the mesh structure 10a described in the first embodiment is double arranged.
The present invention is not limited to this example, and the cylindrical body 10 may have a structure in which the mesh structure 10a described in the first embodiment is arranged three or more times.
As shown in FIG. 11, the plurality of mesh structures 10a are interconnected by connecting wires 61. As shown in FIG. The material of the connecting wire 61 is not particularly limited, and may be a metal material or a resin material.
The connecting wire 61 is inserted through the meshes of the plurality of mesh structures 10a so as to sew the meshes of the plurality of mesh structures 10a. For example, the connecting wires 61 are arranged in a circular fashion at one end side and the other end side of the cylindrical body 10 in the axial direction.

As described above, the stent 100 according to the present embodiment includes a plurality of mesh structures 10a that are coaxially arranged in multiples, and the connecting wires 61 that interconnect the plurality of mesh structures 10a.
Therefore, it is possible to suppress the positional deviation of the plurality of mesh structures 10a in the axial direction, and it is possible to suppress the separation of the plurality of mesh structures 10a in the radial direction.

In the case of the present embodiment, the extending directions of the twisted wire portions 39 in the plurality of mesh structures 10a may be the same diagonal direction, or may be diagonal directions that intersect each other (opposite to each other). .

The markers 63 are provided, for example, at one or both ends of the cylindrical body 10 in the axial direction, and are also provided at the central portion of the cylindrical body 10 in the axial direction.

Each of the plurality of mesh structures 10a included in the tubular body 10 can be the mesh structure 10a described in any one of the above-described embodiments, and the mesh structures 10a described in different embodiments can be overlapped to form a cylinder. Shaped body 10 may be configured.

[Fifth embodiment]
Next, 5th Embodiment is described using Fig.13 (a) and FIG.13(b).
The stent 100 according to this embodiment differs from the stent 100 according to the first embodiment in the following points, and is otherwise the same as the stent 100 according to the first embodiment. It is configured.

In this embodiment, stent 100 further comprises a tubular body 62 coaxially arranged with tubular body 10 . Therefore, the stent 100 has good resistance to ingrowth (invasion of a tumor or the like into the stent 100).
The tubular body 62 is made of, for example, a resin material. The tubular body 62 may cover the outer peripheral surface of the tubular body 10 as shown in FIGS. 13(a) and 13(b). may cover the outer peripheral surface of the Alternatively, the tubular body 62 may be constructed by impregnating the network structure 10a of the tubular body 10 with a resin material.

[Sixth embodiment]
Next, 6th Embodiment is described using Fig.14 (a) and FIG.14(b).
The stent 100 according to this embodiment differs from the stent 100 according to the fourth embodiment in the following points, and is otherwise the same as the stent 100 according to the fourth embodiment. It is configured.

In this embodiment, stent 100 further comprises a tubular body 62 coaxially arranged with tubular body 10 . The tubular body 62 is similar to that of the fifth embodiment.
The tubular body 62 may cover the outer peripheral surface of the tubular body 10 as shown in FIGS. 14(a) and 14(b). may cover the outer peripheral surface of the Alternatively, the tubular body 62 may be constructed by impregnating the network structure 10a of the tubular body 10 with a resin material.
Further, in the case of the present embodiment, the tubular body 62 may be arranged at a position sandwiched between the plurality of mesh structures 10a of the tubular body 10 . That is, for example, the mesh structure 10a, the tubular body 62, and the mesh structure 10a may be arranged in this order from the inner side in the radial direction to form a triple structure.

The present invention is not limited to the above-described embodiments, and includes various modifications and improvements as long as the object of the present invention is achieved.

For example, in the first embodiment described above, as shown in FIG. 4, the zigzag extension 33c is a part of the second portion 33, but the zigzag extension 33c is the first portion 32 ( It may be a part of the uppermost first zigzag extending portion 34 in FIG. In other words, the uppermost first zigzag extending portion 34 may include five first extending portions 35 and five second extending portions 36 .
In this case, for example, one end of the first portion 32 (one end of the first wire 31) can be the one end 33a shown in FIG.

Further, in the first embodiment described above, an example was described in which the first wire 31 forming the first structure 11 and the second wire 41 forming the second structure 12 were separate wires. 31 and the second wire 41 may be one part of one wire.
Further, in the above-described first embodiment, an example in which the first portion 32 and the second portion 33 are each a part of the single first wire 31 has been described, but the first portion 32 and the second portion 33 are , may be separate wires. Further, in the above-described first embodiment, an example in which the third portion 42 and the fourth portion 43 are each part of one second wire 41 has been described, but the third portion 42 and the fourth portion 43 are , may be separate wires.

Also, the stent 100 according to the second or third embodiment may have the tubular body 62 .

Moreover, each of the above-described embodiments can be appropriately combined without departing from the gist of the present invention.

This embodiment includes the following technical ideas.
(1) A stent having a cylindrical body with an oblique mesh structure made of wires,
the wire includes a first portion and a second portion;
The network structure includes a plurality of stages arranged at positions offset from each other in the axial direction of the tubular body,
The first portion includes a plurality of zigzag extending portions each extending in a range longer than one turn in the circumferential direction of the tubular body while zigzag in the axial direction at each stage,
In each zigzag extension, a first extension extending in a first inclination direction and a second extension extending in a second inclination direction opposite to the first inclination direction are alternately arranged. It has a shape that is repeatedly connected, and the end extending in the circumferential direction is connected to the zigzag extending portion of the next stage,
Each zigzag extending portion engages with the zigzag extending portion of the adjacent stage at the tip of the zigzag swing to form a hook portion,
the second extension at one end of each zigzag extension is wrapped around the second extension at the other end of the zigzag extension;
The stent, wherein the second portion is sequentially wound around the second extension portions of the zigzag extension portions that are arranged to extend from each other.
(2) The second portion includes a winding portion wound around a hook portion with which the zigzag extension portions are engaged, and the extension direction is switched with the winding portion as a boundary. The stent according to (1).
(3) The stent according to (1) or (2), wherein the portions of the second portion extend parallel to each other in portions other than both end portions of the mesh structure.
(4) A stent having a cylindrical body with an oblique mesh structure made of wires,
the wire includes a first portion and a second portion;
The network structure includes a plurality of stages arranged at positions offset from each other in the axial direction of the tubular body,
The first portion includes a plurality of zigzag extending portions each extending in a range of less than one turn in the circumferential direction of the cylindrical body while zigzag in the axial direction at each stage,
Each zigzag extending portion engages with the zigzag extending portion of the adjacent stage at its zigzag tip to form a hook portion. It is connected to the existing department,
The second portion swings zigzag in the axial direction so as to complementarily form the mesh structure with the assembly of the plurality of zigzag extension portions, and the second portion is connected to the next step in order while the cylindrical body A stent that extends a plurality of times in a circumferential direction, and that engages with the zigzag extending portion of the corresponding stage at the tip of the zigzag swing to form a hook portion.
(5) According to (4), the number of zigzag deflections in the zigzag extensions of the portions other than both ends of the network structure is smaller than the number of zigzag deflections in the zigzag extensions of both ends of the network structure. stent.
(6) The stent according to (5), wherein the number of zigzag deflections in each zigzag extending portion is equal to each other in portions other than both end portions of the mesh structure.
(7) The zigzag shape of the second portion includes a first extending portion that extends obliquely by two steps and an oblique portion that is opposite to the first extending portion from the point where the first extending portion extends. The stent according to (5) or (6), which has a shape in which the second extending portions that are folded back in the direction and extend obliquely by one stage are alternately and repeatedly connected.
(8) A stent having a tubular body with an oblique mesh structure made of wires,
The wires include a first wire and a second wire,
the first wire includes a first portion and a second portion;
The network structure includes a cylindrical first structure and a second cylindrical structure that are coaxially and overlapped with each other,
The first structure is a diagonal lattice structure made up of the first wire, and includes a plurality of steps arranged at mutually displaced positions in the axial direction of the cylindrical body,
The first portions each extend in a range longer than one turn in the circumferential direction of the cylindrical body while swaying zigzag in the axial direction at each stage of the first structure. including a zigzag extension;
Each first zigzag extension includes a first extension extending in a first inclination direction and a second extension extending in a second inclination direction opposite to the first inclination direction. It has a shape that is alternately and repeatedly connected, and is connected to the first zigzag extension part of the next step in the first structure at the end extending in the circumferential direction,
Each of the first zigzag extensions engages with the first zigzag extension of the adjacent stage in the first structure at the zigzag tip to form a hook,
the second extension at one end of each first zigzag extension is wound around the second extension at the other end of the first zigzag extension;
the second portion is sequentially wound around the second extension portions of the second extension portions of the first zigzag extension portions that are arranged to extend from each other;
the second wire includes a third portion and a fourth portion;
The second structure is a diagonal lattice structure made up of the second wires, and includes a plurality of steps arranged at positions offset from each other in the axial direction of the cylindrical body,
The third portion includes a plurality of second zigzag extending portions each extending in a range of less than one turn in the circumferential direction of the tubular body while zigzagly swaying in the axial direction at each stage of the second structure. including
Each of the second zigzag extensions engages with a second zigzag extension of an adjacent stage in the second structure at its zigzag tip to form a hook, and extends in the circumferential direction. is connected to the second zigzag extending portion of the next step in the second structure,
The fourth portion swings zigzag in the axial direction so as to complementarily configure the second structure with the assembly of the plurality of second zigzag extensions, and sequentially moves to the next stage in the second structure. and extends a plurality of times in the circumferential direction of the cylindrical body while continuing to the second structure, and engages with the second zigzag extending portion of the corresponding step in the second structure at the tip of the zigzag swing to engage with the hook Stent forming part.
(9) The stent of (8), wherein the first structure and the second structure are braided together.
(10) The first structure and the second structure alternately pass through the outer surface side and the inner surface side of the first wire each time the second zigzag extension part swings zigzag. (9) The stent of (9) that is braided together.
(11) a plurality of the mesh structures coaxially arranged in multiples;
a connecting wire interconnecting the plurality of mesh structures;
The stent of any one of (8) to (10), comprising:
(12) The stent according to any one of (1) to (11), further comprising a tubular body arranged coaxially with the tubular body.

10 Cylindrical body 10a Mesh structure 11 First structure 12 Second structure 13 First structure step 14 Second structure step 15a, 15b End 31 First wire 32 First portion 32a One end 32b The other end 32c Turning point 33 Second Two parts 33a One end 33b The other end 33c Zigzag extension 33d Terminal ends 33e, 33f, 33g, 33h, 33i, 33j, 33k Intermediate point 34 First zigzag extension (zigzag extension)
35 First extension portion 36 Second extension portion 36a Second extension portion 37 at one end Hook portions 38, 38a Winding portion 39 Twisted wire portion 41 Second wire 42 Third portion 42a One end 42b Other end 43 Fourth portion 43a One end 43b Other end 44 Second zigzag extension (zigzag extension)
45 first extension 46 second extension 47, 48 hook 49 first extension 50 second extension 61 connecting wire 62 tubular body 63 marker 100 stent

Claims (12)

A stent having a cylindrical body with an oblique lattice-like mesh structure made of wires,
the wire includes a first portion and a second portion;
The network structure includes a plurality of stages arranged at positions offset from each other in the axial direction of the tubular body,
The first portion includes a plurality of zigzag extending portions each extending in a range longer than one turn in the circumferential direction of the tubular body while zigzag in the axial direction at each stage,
In each zigzag extension, a first extension extending in a first inclination direction and a second extension extending in a second inclination direction opposite to the first inclination direction are alternately arranged. It has a shape that is repeatedly connected, and the end extending in the circumferential direction is connected to the zigzag extending portion of the next stage,
Each zigzag extending portion engages with the zigzag extending portion of the adjacent stage at the tip of the zigzag swing to form a hook portion,
the second extension at one end of each zigzag extension is wrapped around the second extension at the other end of the zigzag extension;
The stent, wherein the second portion is sequentially wound around the second extension portions of the zigzag extension portions that are arranged to extend from each other. The second portion includes a winding portion that is wound around a hook portion with which the zigzag extension portions are engaged with each other, and the extension direction is switched with the winding portion as a boundary. 1. The stent according to 1. 3. The stent according to claim 1, wherein the portions of the second portion extend parallel to each other in portions other than both end portions of the mesh structure. A stent having a cylindrical body with an oblique lattice-like mesh structure made of wires,
the wire includes a first portion and a second portion;
The network structure includes a plurality of stages arranged at positions offset from each other in the axial direction of the tubular body,
The first portion includes a plurality of zigzag extending portions each extending in a range of less than one turn in the circumferential direction of the cylindrical body while zigzag in the axial direction at each stage,
Each zigzag extending portion engages with the zigzag extending portion of the adjacent stage at its zigzag tip to form a hook portion. It is connected to the existing department,
The second portion swings zigzag in the axial direction so as to complementarily form the mesh structure with the assembly of the plurality of zigzag extension portions, and the second portion is connected to the next step in order while the cylindrical body A stent that extends a plurality of times in a circumferential direction, and that engages with the zigzag extending portion of the corresponding stage at the tip of the zigzag swing to form a hook portion. 5. The stent according to claim 4, wherein the number of zigzag deflections in the zigzag extending parts of the network structure other than both ends is smaller than the number of zigzag deflections in the zigzag extending parts at both ends of the network structure. 6. The stent according to claim 5, wherein the number of zigzag deflections in each zigzag extending portion is equal to each other in portions other than both end portions of the network structure. The zigzag shape of the second portion includes a first extending portion that extends obliquely in two steps and a tip of the first extending portion that is folded back in an oblique direction opposite to the first extending portion. 7. The stent according to claim 5 or 6, having a shape in which the second extending portions extending obliquely by one step are alternately and repeatedly connected. A stent having a cylindrical body with an oblique lattice-like mesh structure made of wires,
The wires include a first wire and a second wire,
the first wire includes a first portion and a second portion;
The network structure includes a cylindrical first structure and a second cylindrical structure that are coaxially and overlapped with each other,
The first structure is a diagonal lattice structure made up of the first wire, and includes a plurality of steps arranged at mutually displaced positions in the axial direction of the cylindrical body,
The first portions each extend in a range longer than one turn in the circumferential direction of the cylindrical body while swaying zigzag in the axial direction at each stage of the first structure. including a zigzag extension;
Each first zigzag extension includes a first extension extending in a first inclination direction and a second extension extending in a second inclination direction opposite to the first inclination direction. It has a shape that is alternately and repeatedly connected, and is connected to the first zigzag extension part of the next step in the first structure at the end extending in the circumferential direction,
Each of the first zigzag extensions engages with the first zigzag extension of the adjacent stage in the first structure at the zigzag tip to form a hook,
the second extension at one end of each first zigzag extension is wound around the second extension at the other end of the first zigzag extension;
the second portion is sequentially wound around the second extension portions of the second extension portions of the first zigzag extension portions that are arranged to extend from each other;
the second wire includes a third portion and a fourth portion;
The second structure is a diagonal lattice structure made up of the second wires, and includes a plurality of steps arranged at positions offset from each other in the axial direction of the cylindrical body,
The third portion includes a plurality of second zigzag extending portions each extending in a range of less than one turn in the circumferential direction of the tubular body while zigzagly swaying in the axial direction at each stage of the second structure. including
Each of the second zigzag extensions engages with a second zigzag extension of an adjacent stage in the second structure at its zigzag tip to form a hook, and extends in the circumferential direction. is connected to the second zigzag extending portion of the next step in the second structure,
The fourth portion swings zigzag in the axial direction so as to complementarily configure the second structure with the assembly of the plurality of second zigzag extensions, and sequentially moves to the next stage in the second structure. and extends a plurality of times in the circumferential direction of the cylindrical body while continuing to the second structure, and engages with the second zigzag extending portion of the corresponding step in the second structure at the tip of the zigzag swing to engage with the hook Stent forming part. 9. The stent of claim 8, wherein said first structure and said second structure are braided together. The first structure and the second structure are braided to each other by alternately passing through the outer surface side and the inner surface side of the first wire each time the second zigzag extension part swings zigzag. 10. The stent of claim 9. a plurality of the mesh structures coaxially arranged in multiples;
a connecting wire interconnecting the plurality of mesh structures;
11. The stent of any one of claims 8-10, comprising: 12. The stent according to any one of claims 1 to 11, further comprising a tubular body arranged coaxially with the tubular body.

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