JP2021019708A - Stent - Google Patents

Abstract

To provide a stent having a novel structure.SOLUTION: Provided is a stent having a network structure, the stent including: a first tubular portion; a pair of second tubular portions branching from one end of the first tubular portion; a first wire 31; and a second wire 41. One portion of the stent has a specific structure portion 10a in which a first structure 11 and a second structure 12 are braided with each other in a way that a second zigzag extending portion 44 comprised of the second wire 41 alternately passes in an outer surface side and an inner surface side of the first wire 31 each time the second zigzag extending portion swings in a zigzag.SELECTED DRAWING: Figure 12

Description

The present invention relates to a stent.

Examples of the stent having an oblique lattice-like network structure composed of wires include those described in Patent Document 1. Patent Document 1 describes a stent having a Y-shaped branched structure.

JP-A-2016-214633

The present invention provides a stent having a novel structure.

The present invention is a network-structured stent composed of wires.
Includes a first tubular portion and a pair of second tubular portions branched from one end of the first tubular portion.
The wire includes a first wire and a second wire.
The first wire includes a first portion and a second portion.
At least a part of the stent is a specific structural part in which the network structure includes a first structure and a second structure.
In the specific structural part
The first structure is a diagonal grid formed by the first wire, and includes a plurality of stages arranged at positions deviated from each other in the axial direction.
The first portion includes a plurality of first zigzag extending portions extending in a circumferential direction over a range longer than one round while swinging in a zigzag manner in the axial direction in each stage of the first structure. Including
Each of the first zigzag extending portions includes a first extending portion extending in the first inclined direction and a second extending portion extending in a second inclined direction opposite to the first inclined direction. It has a shape that is alternately and repeatedly connected, and is connected to the first zigzag extending portion of the adjacent stage in the first structure at the end extending in the circumferential direction.
Each of the first zigzag extending portions engages with the first zigzag extending portion of the adjacent stage in the first structure at the tip of the zigzag swing to form a hook portion.
The second extending portion at one end of each first zigzag extending portion is wound around the second extending portion at the other end of the first zigzag extending portion.
The second portion is sequentially wound around the second extending portion of the second extending portion of each first zigzag extending portion, which is arranged on the extension of each other.
The second wire includes a third portion and a fourth portion.
The second structure is an oblique lattice structure composed of the second wire, and includes a plurality of steps arranged at positions deviated from each other in the axial direction.
The third portion includes a plurality of second zigzag extending portions extending in a range of less than one round in the circumferential direction while swinging in a zigzag manner in the axial direction in each stage of the second structure.
Each second zigzag extending portion engages with the second zigzag extending portion of the adjacent stage in the second structure to form a hook portion at the tip of the zigzag swing, and extends in the circumferential direction. At the end, it is connected to the second zigzag extending part of the adjacent stage in the second structure.
The fourth portion sequentially swings in an axial direction in a zigzag manner so as to form the second structure in a complementary manner to an aggregate of the plurality of second zigzag extending portions. A hook portion is formed by engaging with the second zigzag extending portion of the corresponding stage in the second structure at the tip of the zigzag swinging in the circumferential direction while being continuous with the second zigzag extending portion. It provides a stent that is in use.

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

It is a figure which shows the image which imaged the stent which concerns on 1st Embodiment. It is a schematic plan view of the stent which concerns on 1st Embodiment. FIG. 3A is a schematic plan view showing a first unit 81 constituting the stent according to the first embodiment, and FIG. 3B is a second unit 82 constituting the stent according to the first embodiment. It is a schematic plan view which shows. 4 (a) is a schematic cross-sectional view taken along the line AA of FIGS. 1 and 2, and FIG. 4 (b) is a schematic cross-sectional view taken along the line BB of FIGS. 1 and 2. It is a cross-sectional view, and FIG. 4C is a schematic cross-sectional view taken along the lines CC of FIGS. 1 and 2. 5 (a) is a schematic cross-sectional view taken along the line AA of FIG. 3 (a), and FIG. 5 (b) is a schematic cross-sectional view taken along the line BB of FIG. 3 (a). 5 (c) is a schematic cross-sectional view taken along the line AA of FIG. 3 (b), and FIG. 5 (d) is a line BB of FIG. 3 (b). It is a schematic cross-sectional view along. It is a schematic development view which shows the 1st part in the 1st structure of the specific structure part of the stent which concerns on 1st Embodiment. It is a schematic development view which shows the 2nd part in the 1st structure of the specific structure part of the stent which concerns on 1st Embodiment. It is a schematic development view which shows the 1st structure of the specific structure part of the stent which concerns on 1st Embodiment. It is a schematic development view which shows the 3rd part in the 2nd structure of the specific structure part of the stent which concerns on 1st Embodiment. It is a schematic development view which shows the 4th part in the 2nd structure of the specific structure part of the stent which concerns on 1st Embodiment. It is a schematic development view which shows the 2nd structure of the specific structure part of the stent which concerns on 1st Embodiment. It is a schematic development view which shows the braided structure of the 1st structure and the 2nd structure of the specific structure part of the stent which concerns on 1st Embodiment. 13 (a) is a schematic plan sectional view of the stent according to the second embodiment, and FIG. 13 (b) is a schematic cross-sectional view taken along the line AA of FIG. 13 (a). .. It is a schematic plan view of the stent which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all drawings, similar components are designated by the same reference numerals, and duplicate description will be omitted as appropriate.

[First Embodiment]
First, the first embodiment will be described with reference to FIGS. 1 to 12.
FIG. 6 shows the shape of the first structure 11 of the specific structure portion 10a when the structure composed of the first portion 32 of the first wire 31 is flatly developed. Actually, the structure shown in FIG. 6 is formed in a tubular shape with the vertical direction in FIG. 6 as the axial direction. That is, in FIG. 6, the left-right direction is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 6 is continuous with the left end.
Similarly, FIG. 7 shows the shape of the first structure 11 of the specific structure portion 10a when the structure composed of the second portion 33 of the first wire 31 is flatly developed. Actually, the structure shown in FIG. 7 is formed in a tubular shape with the vertical direction in FIG. 7 as the axial direction. The left-right direction in FIG. 7 is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 7 is continuous with the left end. In FIG. 7, the first portion 32 (structure shown in FIG. 6) is shown by a two-dot chain line.
Similarly, FIG. 8 shows the shape of the first structure 11 of the specific structure portion 10a when it is developed flat. Actually, the structure shown in FIG. 8 is formed in a tubular shape with the vertical direction in FIG. 8 as the axial direction. The left-right direction in FIG. 8 is the circumferential direction of the first structure 11, and the right end of the structure shown in FIG. 8 is continuous with the left end.
Similarly, FIG. 9 shows the shape when the structure composed of the third portion 42 of the second wire 41 in the second structure 12 (FIG. 11) of the specific structure portion 10a is developed flat. Actually, the structure shown in FIG. 9 is formed in a tubular shape with the vertical direction in FIG. 9 as the axial direction. The left-right direction in FIG. 9 is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 9 is continuous with the left end.
Similarly, FIG. 10 shows the shape of the second structure 12 of the specific structure portion 10a when the structure composed of the fourth portion 43 of the second wire 41 is flatly developed. Actually, the structure shown in FIG. 10 is formed in a tubular shape with the vertical direction in FIG. 10 as the axial direction. The left-right direction in FIG. 10 is the circumferential direction of the tubular structure, and the right end of the structure shown in FIG. 10 is continuous with the left end. In FIG. 10, the third portion 42 (structure shown in FIG. 9) is shown by a two-dot chain line.
Similarly, FIG. 11 shows the shape of the second structure 12 of the specific structure portion 10a when it is developed flat. Actually, the structure shown in FIG. 11 is formed in a tubular shape with the vertical direction in FIG. 11 as the axial direction. The left-right direction in FIG. 11 is the circumferential direction of the second structure 12, and the right end of the structure shown in FIG. 11 is continuous with the left end.
Similarly, FIG. 12 shows the shape of the specific structural portion 10a when it is developed flat. Actually, the specific structural portion 10a is formed in a tubular shape with the vertical direction in FIG. 12 as the axial direction. The left-right direction in FIG. 12 is the circumferential direction of the specific structure portion 10a, and the right end of the structure shown in FIG. 12 is continuous with the left end.

As shown in FIGS. 1 and 2, the stent 100 according to the present embodiment is a stent 100 having a network structure composed of wires.
The stent 100 includes a first tubular portion 71 and a pair of second tubular portions 72, 73 branched from one end (tip 71b) of the first tubular portion 71.
The stent 100 includes first wire 31 (FIGS. 6 to 8) and second wire 41 (FIGS. 9 to 11) as wires. The first wire 31 includes a first portion 32 (FIG. 6) and a second portion 33 (FIGS. 7, 8).
At least a portion of the stent 100 is a specific structural portion 10a (FIG. 12) whose network structure includes a first structure 11 (FIG. 8) and a second structure 12 (FIG. 11).
In the specific structure portion 10a, as shown in FIG. 8, the first structure 11 has a diagonal lattice shape composed of the first wires 31, and a plurality of structures arranged at positions deviated from each other in the axial direction. The stage 13 (FIGS. 6 to 8) is included.
The first portion 32 is a plurality of first zigzag extending portions 34 extending in the circumferential direction over a range longer than one round while swinging in an axial direction in each stage 13 of the first structure 11. (Fig. 6) is included.
As shown in FIG. 6, each of the first zigzag extending portions 34 has a first extending portion 35 extending in the first inclination direction (upward right direction in FIG. 6) and the direction opposite to the first inclination direction. The shape is such that the second extending portion 36 extending in the second inclined direction (downward to the right in FIG. 6) is alternately and repeatedly connected, and the adjacent step in the first structure 11 at the end extending in the circumferential direction. It is connected to the first zigzag extending portion 34 of the above.
Each of the first zigzag extending portions 34 is engaged with the first zigzag extending portion 34 of the adjacent step 13 in the first structure 11 at the tip of the zigzag extending portion to form a hook portion 37.
The second extending portion 36 at one end of each first zigzag extending portion 34 (second extending portion 36a shown in FIG. 6) is the second extending portion 36 at the other end of the first zigzag extending portion 34. It is wrapped around. That is, the second extending portions 36 form a stranded wire (twisted wire portion 39).
As shown in FIGS. 7 and 8, the second portion 33 is formed around the second extending portion 36 of the second extending portion 36 of each first zigzag extending portion 34, which is arranged on the extension of each other. It is wound in sequence. That is, the stranded wire (twisted wire portion 39) is also formed by the second extending portion 36 and the second portion 33.
The second wire 41 includes a third portion 42 (FIG. 9) and a fourth portion 43 (FIGS. 10 and 11).
As shown in FIG. 11, the second structure 12 has a diagonal lattice shape composed of the second wire 41, and a plurality of stages 14 (FIGS. 9 to 9) arranged at positions deviated from each other in the axial direction. FIG. 11) is included.
As shown in FIG. 9, the third portion 42 is a plurality of second zigzag extensions extending in the circumferential direction in a range of less than one round while swinging in an axial zigzag manner in each stage 14 of the second structure 12, respectively. Including 44.
Each second zigzag extending portion 44 engages with the second zigzag extending portion 44 of the adjacent step 14 in the second structure 12 at the tip of the zigzag extending portion to form a hook portion 47, and forms a hook portion 47 in the circumferential direction. It is connected to the second zigzag extending portion 44 of the adjacent step 14 in the second structure 12 at the end extending to.
As shown in FIG. 10, the fourth portion 43 is axial so as to form the second structure 12 (FIG. 11) complementary to the aggregate (see FIG. 9) of the plurality of second zigzag extending portions 44. The second of the corresponding steps 14 in the second structure 12 is extended in the circumferential direction while being sequentially connected to the adjacent step 14 in the second structure 12 while swinging in a zigzag pattern. The hook portion 48 is formed by engaging with the zigzag extending portion 44.

According to this embodiment, it is possible to provide a stent 100 having such a novel structure.
More specifically, the specific structural portion 10a of the stent 100 includes a first structure 11 and a second structure 12.
The first structure 11 has a structure in which the first zigzag extending portions 34 of each stage 13 are engaged with each other at the hook portion 37 at the tip of the zigzag swing, and therefore has good shape retention. Here, the fact that the stent 100 has good shape retention means that when the stent 100 is compressed in the radial direction, it has a sufficient expansion force (radial force) that tries to expand (restore) in the radial direction. is there. Since the first zigzag extending portion 34 of each stage 13 extends one round in the circumferential direction while swinging in a zigzag manner, sufficient shape retention is realized evenly over substantially the entire area of the first structure 11. can do. Moreover, since the second extending portion 36 at one end of each first zigzag extending portion 34 is wound around the second extending portion 36 at the other end of the first structure 11, the first structure 11 has even better shape retention. Have. In addition, the second portion 33 of the first wire 31 constituting the first structure 11 is a second extension of the second extension 36 of each first zigzag extension 34, which is arranged on the extension of each other. Since the first structure 11 is sequentially wound around the portion 36, the first structure 11 has better shape retention.
The second structure 12 has a structure in which the second zigzag extending portions 44 of each stage 14 are engaged with each other at the hook portion 47 at the tip of the zigzag swing, and therefore 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 constitutes the second structure 12 in an oblique grid pattern complementary to the aggregate of the plurality of second zigzag extending portions 44, the fourth portion 43 is evenly covered over the entire area of the second structure 12. Sufficient shape retention can be realized.
As described above, according to the present embodiment, good shape retention of the stent 100 can be realized.
In the case of the present embodiment, the first extending portion 35 of the first structure 11 is not stranded except for a part of the first extending portion 35, so that the stent 100 has sufficient flexibility. Here, the fact that the stent 100 has flexibility means that the axial force is moderately small.
The stent 100 can be placed, for example, at the bifurcation of the bile duct (both lobes of the hepatic hilum).

Hereinafter, a more detailed description will be given.

As shown in FIGS. 1, 2, 4 (a), 4 (b) and 4 (c), the first cylindrical portion 71, the second tubular portion 72 and the second tubular portion 73 are For example, each is formed in a cylindrical shape having a mesh structure.
The lumen region of the first tubular portion 71 is the lumen region of the second tubular portion 72 and the lumen of the second tubular portion 73 on one end side (tip portion 71b) of the first tubular portion 71. It communicates with the area.
For example, the axial direction of the second tubular portion 72 and the axial direction of the second tubular portion 73 are inclined with respect to the axial direction of the first tubular portion 71, and the overall shape of the stent 100 is It has a Y shape.

More specifically, the stent 100 is configured by combining the first unit 81 shown in FIG. 3 (a) and the second unit 82 shown in FIG. 3 (b).
As shown in FIG. 3A, the first unit 81 integrally includes a tubular first mesh structure 81a and one second tubular portion 72. As shown in FIGS. 5A and 5B, the first mesh structure 81a and the second tubular portion 72 are each formed in a cylindrical shape. The base end 85 of the first network structure 81a is generally open. A second tubular portion 72 is connected to the tip 86 of the first mesh structure 81a. The lumen region of the first network structure 81a and the lumen region of the second tubular portion 72 communicate with each other. The second tubular portion 72 is formed to have a smaller diameter than the first mesh structure 81a. A part of the tip 86 of the first mesh structure 81a communicates with the base end 72a of the second tubular portion 72, and the other part of the tip of the first mesh structure 81a becomes an opening 83 open to the outside. There is. The tip 72b of the second tubular portion 72 is generally open.
Similarly, as shown in FIG. 3B, the second unit 82 integrally has a tubular second mesh structure 82a and the other second tubular portion 73. As shown in FIGS. 5 (c) and 5 (d), the second mesh structure 82a and the second tubular portion 72 are each formed in a cylindrical shape. The base end 87 of the second network structure 82a is generally open. A second tubular portion 73 is connected to the tip 88 of the second mesh structure 82a. The lumen region of the second network structure 82a and the lumen region of the second tubular portion 72 communicate with each other. The second tubular portion 73 is formed to have a smaller diameter than the second mesh structure 82a. A part of the tip 88 of the second mesh structure 82a communicates with the base end 73a of the second tubular portion 73, and the other part of the tip of the second mesh structure 82a becomes an opening 84 open to the outside. There is. The tip 73b of the second tubular portion 73 is generally open.

For example, the second unit 82 is inserted into the first unit 81 from the base end 85 side of the first unit 81, the second mesh structure 82a is accommodated inside the first mesh structure 81a, and the second mesh structure 82a is accommodated through the opening 83. The first unit 81 and the second unit 82 are combined by projecting the two tubular portions 73 to the outside of the first unit 81. The opening 84 of the second unit 82 is in a state of communicating with the base end 72a of the second tubular portion 72.

In the case of the present embodiment, the first structure 11 is continuously formed over the entire first unit 81. In the first unit 81, the second structure 12 is formed over the entire second tubular portion 72, but the second structure 12 is not formed in the first network structure 81a.
Similarly, in the case of the present embodiment, the first structure 11 is continuously formed over the entire second unit 82. In the second unit 82, the second structure 12 is formed over the entire second tubular portion 73, but the second structure 12 is not formed in the second network structure 82a.

As described above, the stent 100 includes the first unit 81 in which the tubular first network structure 81a forming a part of the first tubular portion 71 and the one second tubular portion 72 are integrally formed. It is configured by combining a tubular second mesh structure 82a forming another part of the first tubular portion 71 and a second unit 82 in which the other second tubular portion 73 is integrally formed. Has been done.
The second mesh structure 82a of the second unit 82 is housed inside the first mesh structure 81a of the first unit 81 (see FIG. 4A).
The second tubular portion 73 of the second unit 82 projects outward from the first unit 81 through the openings 83 (FIGS. 3A and 2) formed in the first unit 81.
The first structure 11 constituting the first unit 81 is continuously formed from the first mesh structure 81a to one of the second tubular portions 72.
The first structure 11 constituting the second unit 82 is continuously formed from the second mesh structure 82a to the other second tubular portion 73.

In the case of the present embodiment, for example, each of the second tubular portions 72 and 73 is a specific structural portion 10a.
Further, the first tubular portion 71 is configured by the first structure 11 having a double tubular structure. That is, the first network structure 81a and the second network structure 82a are each composed of the first structure 11.

As shown in FIGS. 1 and 2, the stent 100 includes a connecting wire 61 that connects the first network structure 81a of the first unit 81 and the second network structure 82a of the second unit 82. .. Therefore, the positional deviation between the first network structure 81a and the second network structure 82a can be suppressed in the axial direction, and the separation between the first network structure 81a and the second network structure 82a can be suppressed in the radial direction.
The connecting wire 61 is arranged, for example, at the base end portion 71a of the first tubular portion 71.
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 into the meshes of the first mesh structure 81a and the second mesh structure 82a so as to sew the meshes of the first mesh structure 81a and the second mesh structure 82a together. For example, the connecting wire 61 is arranged in a circumferential shape at the base end portion 71a of the first tubular portion 71.

Next, the specific structural portion 10a will be described in detail.

As described above, the specific structure portion 10a includes a tubular first structure 11 (FIG. 8) and a second structure 12 (FIG. 11), respectively. Of these, the first structure 11 is composed of the first wire 31, and the second structure 12 is composed of the second wire 41.
That is, the first unit 81 is configured by using the first wire 31 and the second wire 41, and the second unit 82 is also configured by using the first wire 31 and the second wire 41 in the same manner. ing.
The first structure 11 and the second structure 12 are arranged so as to be coaxial with each other and overlap each other. In the case of this embodiment, the first structure 11 and the second structure 12 are braided to each other. Therefore, the positional deviation between the first structure 11 and the second structure 12 can be suppressed in the axial direction, and the separation between the first structure 11 and the second structure 12 can be suppressed in the radial direction.

In the case of 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 longitudinal portion of the second wire 41, 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.
The wire diameters (outer diameters) of the first wire 31 and the second wire 41 are not particularly limited, but are preferably 0.05 mm or more and 0.5 mm or less, for example.

In the case of the present embodiment, since the first structure 11 and the second structure 12 are braided to each other, 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 it is done. However, the present invention is not limited to this example, and the specific structure portion 10a is a double cylinder 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. It may be a structure (or a triple or more structure including layers other than the first structure 11 and the second structure 12).

Hereinafter, the first structure 11 will be described in detail with reference to FIGS. 6 to 8.
First, the structure of the portion of the first structure 11 formed by the first portion 32 of the first wire 31 will be described in detail with reference to FIG.
As shown in FIG. 6, the first portion 32 of the first wire 31 constituting the first structure 11 includes a plurality of first zigzag extending portions 34.
One first zigzag extending portion 34 is arranged for each stage 13 of the first structure 11.
Each of the first zigzag extending portions 34 has a first extending portion 35 extending in the first inclination direction (upward right direction in FIG. 6) and a second inclination direction opposite to the first inclination direction (FIG. 6). In 6, the second extending portion 36 extending in the downward-sloping direction) is alternately and repeatedly connected.
In the example of FIG. 6, the uppermost first zigzag extending portion 34 is configured to include two first extending portions 35 and two second extending portions 36.
The first zigzag extending portion 34 in the second and subsequent stages from the top includes five first extending portions 35 and six second extending portions 36. In the case of the present embodiment, in the first zigzag extending portion 34 of the second and subsequent stages, the portion including the five first extending portions 35 and the five second extending portions 36 is equivalent to one round of the first structure 11. Corresponds to. That is, the first zigzag extending portion 34 from the second stage onward 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 of the second and subsequent stages 13 extends over a range longer than one round.
The number of the first extending portion 35 and the second extending portion 36 in the first zigzag extending portion 34 of each stage 13 depends on the diameter of the stent 100, the desired fineness of the specific structural portion 10a, and the like. Can be changed.
The first zigzag extending portions 34 of the adjacent steps 13 have shapes that are inverted from each other in the axial direction. That is, in FIG. 6, the first zigzag extending portion 34 in the odd-numbered stage counting from the top alternately includes the first extending portion 35 and the second extending portion 36 in order from the left. The first zigzag extending portion 34, which is an even-numbered stage counting from the top, alternately includes a second extending portion 36 and a first extending portion 35 in this order from the left.

In FIG. 6, the first portion 32 extends a plurality of turns, starting from one end 32a, while sequentially changing the stage 13.
The first zigzag extending portion 34 at the uppermost stage extends in the circumferential direction with the first extending portion 35 at the left end as a base end. The rightmost (that is, the terminal) second extending portion 36 in the first zigzag extending portion 34 in the uppermost row is the third second extending portion from the left in the first zigzag extending portion 34 in the second row from the top. It is connected to the part 36.
The first zigzag extending portion 34 in the second stage from the top extends in the circumferential direction with the second extending portion 36, which is the third from the left, as a base end. The second extending portion 36 at the end of the first zigzag extending portion 34 in the second stage from the top is wound around the second extending portion 36 at the base end of the first zigzag extending portion 34. The second extending portion 36 at the end of the first zigzag extending portion 34 in the second row from the top is the third extending portion 36 from the left in the first zigzag extending portion 34 in the third row from the top. It is connected to.
The first zigzag extending portion 34 in the third stage from the top extends in the circumferential direction with the second extending portion 36, which is the third from the left, as a base end. The second extending portion 36 at the end of the first zigzag extending portion 34 in the third stage from the top is wound around the second extending portion 36 at the base end of the first zigzag extending portion 34. The second extending portion 36 at the end of the first zigzag extending portion 34 in the third row from the top is the second extending portion 36 in the first zigzag extending portion 34 in the fourth row from the top, which is the fourth from the left. It is connected to.
The first zigzag extending portion 34 in the fourth stage from the top extends in the circumferential direction with the second extending portion 36, which is the fourth from the left, as a base end. The second extending portion 36 at the end of the first zigzag extending portion 34 in the fourth stage from the top is wound around the second extending portion 36 at the base end of the first zigzag extending portion 34. The second extending portion 36 at the end of the first zigzag extending portion 34 in the fourth row from the top is the second extending portion 36 in the first zigzag extending portion 34 in the fifth row from the top, which is the fourth from the left. It is connected to.
The first zigzag extending portion 34 in the fifth stage from the top extends in the circumferential direction with the second extending portion 36, which is the fourth from the left, as a base end. The second extending portion 36 at the end of the first zigzag extending portion 34 in the fifth stage from the top is wound around the second extending portion 36 at the base end of the first zigzag extending portion 34. The second extending portion 36 at the end of the first zigzag extending portion 34 in the fifth row from the top is the fifth extending portion 36 from the left in the first zigzag extending portion 34 in the sixth row from the top. It is connected to.
Similarly, the first zigzag extending portion 34 of each stage 13 is sequentially connected, and the second extending portion 36a at one end of the first zigzag extending portion 34 of each stage 13 extends in the first zigzag. It is wound around the second extending portion 36 at the other end of the portion 34.

Here, the portion where the corner portion of the boundary between the first extending portion 35 and the second extending portion 36 has a convex shape upward in FIG. 6 is referred to as a mountain portion, and the first extending portion 35 The portion where the corner portion of the boundary between the surface and the second extending portion 36 has a downwardly convex shape in FIG. 6 is referred to as a valley portion.
The first zigzag extending portion 34 on the uppermost stage has a structure for two mountains, and the first zigzag extending portion 34 on the second and subsequent stages has a structure for five mountains.

As described above, each of the first zigzag extending portions 34 is engaged with each other with the first zigzag extending portion 34 of the adjacent stage at the tip of the zigzag swing to form the hook portion 37.
In each hook portion 37, the valley portion of one first zigzag extending portion 34 and the mountain portion of the other first zigzag extending portion 34 have a loop shape. The valley portion of one first zigzag extending portion 34 and the mountain portion of the other first zigzag extending portion 34 pass through each other's loops, and the extending directions are reversed, so that the hook portion 37 is formed.
Each valley portion of the first zigzag extending portion 34 of each step 13 engages with each mountain portion of the first zigzag extending portion 34 one step below to form a hook portion 37.

Here, a portion formed by winding a part of the first wire 31 around the other part of the first wire 31 is referred to as a stranded wire portion 39.
The stranded wire portion is formed by winding the second extending portion 36a at one end of the first zigzag extending portion 34 around the second extending portion 36 of the first zigzag extending portion 34. 39.
As described above, the first zigzag extending portion 34 from the second stage onward extends over the range of one round + one second extending portion 36 minutes. The stranded wire portion 39 is formed by winding the second extending portion 36a at one end of the first zigzag extending portion 34 around the second extending portion 36 of the first zigzag extending portion 34. .. Therefore, as shown in FIG. 6, the stranded wire portions 39 of each stage formed by the first portion 32 are arranged diagonally so as to be located on the extension of each other. That is, the stranded wire portions 39 of each stage are connected in a spiral shape.

For example, as shown in FIG. 6, the other end 32b of the first portion 32 forms, for example, a stranded wire portion 39 between the second extending portions 36 of the first zigzag extending portion 34 in the lowermost stage, and a folding point. After the first portion 32 is folded back at 32c, there is one further extension of the first extending portion 35.
The first extending portion 35 including the other end 32b of the first portion 32 is the periphery of the first extending portion 35 corresponding to the first extending portion 35 in the first zigzag extending portion 34 in the lowermost stage. It is wound around the wire to form a stranded wire portion 39.
The other end 32b of the first portion 32 is connected to, for example, the hook portion 37.

Next, with reference to FIG. 7, the structure of the portion of the first structure 11 of the specific structure portion 10a that is composed of the second portion 33 of the first wire 31 will be described.
In FIG. 7, the second portion 33 has one end 33a as a starting end. The one end 33a of the second portion 33 is the same as the one end 32a of the first portion 32. That is, in the first wire 31, one portion having one end 32a (one end 33a) as a boundary is the first portion 32 (two-dot chain line portion in FIG. 7), and the other portion is the second portion 33 (FIG. 7). The solid line part in 7).
The second portion 33 first forms three zigzag extending portions 33c from one end 33a toward the left. Each valley portion of the zigzag extending portion 33c is engaged with each mountain portion of the first zigzag extending portion 34 on the second stage from the top to form a hook portion 37.
The stranded wire portion 39 is formed by winding the second portion 33 around the first zigzag extending portion 34 by one mountain to the left, starting from the end 33d of the zigzag extending portion 33c.
At the end of the stranded wire portion 39, the winding portion 38 (wrapping portion 38a shown in FIG. 7) is formed by winding the second portion 33 around the hook portion 37.
With the winding portion 38a as a boundary, the extending direction of the second portion 33 is switched from the downward-sloping direction to the downward-sloping direction.

At the tip of the winding portion 38a, the second portion 33 is sequentially wound around the second extending portion 36 arranged on the extension of the second extending portion 36 of each first zigzag extending portion 34. Has been done.
In the second portion 33, the tip portion of the winding portion 38a extends downward from the winding portion 38a while being wound around each second extending portion 36 to form a stranded wire portion 39. It reaches the intermediate point 33e shown at the right end in FIG. The 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. 7 and is wound around each second extending portion 36 to form a stranded wire portion 39, and the lowermost portion in FIG. It reaches the hook portion 37 at the right end of the above.
The second portion 33 is wound around the hook portion 37 to form the winding portion 38. With the winding portion 38 as a boundary, the extending direction of the second portion 33 is switched from the downward-sloping direction to the downward-sloping direction.
Further, the second portion 33 is wound around one of the first extending portions 35 of the first zigzag extending portion 34 in the lowermost stage to reach the valley portion of the first zigzag extending portion 34. The extension direction is switched from the downward-sloping direction to the upward-sloping direction.
Subsequently, the second portion 33 is sequentially wound around the second extending portion 36 arranged on the extension of each other to reach the intermediate point 33f shown at the left end in FIG. 7. The intermediate point 33f is also shown at the right end in FIG.
The second portion 33 continues to be wound around each of the second extending portions 36 while extending upward to the left from the rightmost intermediate point 33f in FIG. 7, and reaches the leftmost intermediate point 33g in FIG. 7. This midpoint 33g is also shown at the right end in FIG.
The second portion 33 is subsequently wrapped around a mountain at the right end of the zigzag extension 33c. In the process of winding the second portion 33 around one mountain of the zigzag extending portion 33c, the extending direction is switched from the upward left direction to the downward left direction.
The second portion 33 is wound around one mountain at the right end of the zigzag extending portion 33c, and then wound around the hook portion 37 to form the winding portion 38. With the winding portion 38 as a boundary, the extending direction of the second portion 33 is switched from the downward-sloping direction to the downward-sloping direction.
Subsequently, the second portion 33 is sequentially wound around the second extending portion 36 arranged on the extension of each other to reach the intermediate point 33h shown at the right end in FIG. This midpoint 33h is also shown at the left end in FIG.
The second portion 33 continues to be wound around each of the second extending portions 36 while extending downward to the right from the leftmost intermediate point 33h in FIG. 7, and reaches the rightmost intermediate point 33i in FIG. 7. The midpoint 33i is also shown at the left end in FIG.
Subsequently, the second portion 33 is sequentially wound around the second extending portion 36 arranged on the extension of each other to reach the hook portion 37 at the lowermost stage in FIG. 7. The second portion 33 is wound around the hook portion 37 to form the winding portion 38. With the winding portion 38 as a boundary, the extending direction of the second portion 33 is switched from the downward-sloping direction to the downward-sloping direction.
Further, the second portion 33 is wound around one of the first extending portions 35 of the first zigzag extending portion 34 in the lowermost stage to reach the valley portion of the first zigzag extending portion 34. The extension direction is switched from the downward-sloping direction to the upward-sloping direction.
Subsequently, the second portion 33 is sequentially wound around the second extending portion 36 arranged on the extension of each other to reach the intermediate point 33j shown at the left end in FIG. 7. This intermediate point 33j is also shown at the right end in FIG.
The second portion 33 continues to be wound around each second extending portion 36 while extending upward to the left from the rightmost intermediate point 33j in FIG. 7, and reaches the leftmost intermediate point 33k in FIG. 7. This midpoint 33k is also shown at the right end in FIG.
Subsequently, the second portion 33 is sequentially wound around the second extending portion 36 arranged on the extension of each other, and then wound around one mountain at the left end of the zigzag extending portion 33c, and is wound around the other end 33b. To reach. The other end 33b is, for example, tied to the first portion 32.
One end 32a is one end of the first wire 31, and the other end 33b is the other end of the first wire 31.

As described above, the second portion 33 includes the winding portion 38 wound around the hook portion 37 in which the first zigzag extending portions 34 are engaged with each other, with the winding portion 38 as a boundary. The extension direction has been switched. Therefore, the second portion 33 can be wound around the first portion 32 while being extended in various directions while suppressing the misalignment of the second portion 33 with respect to the first portion 32.

Here, as shown in FIG. 8, each portion of the second portion 33 extends in parallel with each other except for both end portions (end portions 15a and 15b shown in FIG. 8 and the like) of the specific structural portion 10a in the axial direction. doing. That is, in FIG. 8, each portion of the second portion 33 is wound around the second extending portion 36 in the portions other than both ends in the axial direction of the specific structural portion 10a, and is in a downward-sloping direction (second). It extends in the direction of inclination). That is, in FIG. 8, each portion of the second portion 33 does not include a portion extending in the upward-sloping direction (first inclined direction) except for both end portions in the axial direction of the specific structural portion 10a. , The stent 100 can also have moderate deformability.
In other words, in the portion other than both ends in the axial direction of the specific structural portion 10a, the stranded wire portion 39 extends in the downward-sloping direction and does not include the stranded wire portion 39 extending in the upward-sloping direction. Therefore, the stent 100 can be made to have sufficient flexibility.

The first structure 11 is configured as described above.

Hereinafter, the second structure 12 will be described in detail with reference to FIGS. 9 to 11.
First, with reference to FIG. 9, the structure of the portion of the second structure 12 formed by the third portion 42 of the second wire 41 will be described in detail.
As shown in FIG. 9, the third portion 42 of the second wire 41 constituting the second structure 12 includes a plurality of second zigzag extending portions 44.
One second zigzag extending portion 44 is arranged for each stage 14 of the second structure 12.
Each of the second zigzag extending portions 44 has a first extending portion 45 extending in the third inclined direction (upward right direction in FIG. 9) and a fourth inclined direction opposite to the third inclined direction (FIG. 9). In 9, the second extending portion 46 extending in the downward-sloping direction) is alternately and repeatedly connected.
In the example of FIG. 9, the uppermost second zigzag extending portion 44 is configured to include five second extending portions 46 and four first extending portions 45. The lowermost second zigzag extending portion 44 is configured to include five second extending portions 46 and five first extending portions 45. The second zigzag extending portion 44 of each of the other stages 14 is configured to include four second extending portions 46 and four first extending portions 45.
In the example of FIG. 9, the five second extending portions 46 and the five first extending portions 45 correspond to one round of the second structure 12. Therefore, each of the second zigzag extending portions 44 other than the lowermost stage extends over a range of less than one round.

In FIG. 9, the third portion 42 extends a plurality of orbits, starting from one end 42a, while sequentially changing the stage 14.
The uppermost second zigzag extending portion 44 extends in the circumferential direction with the second extending portion 46 including one end 42a as a base end. The terminal second extending portion 46 of the uppermost second zigzag extending portion 44 is shown at the left end in FIG. The terminal second extending portion 46 of the uppermost second zigzag extending portion 44 is connected to the leftmost second extending portion 46 of the second zigzag extending portion 44 of the second stage from the top.
The rightmost second extending portion 46 of the second zigzag extending portion 44 in the second row from the top is connected to the second extending portion 46 of the second zigzag extending portion 44 in the third row from the top.
Similarly, the second zigzag extending portion 44 in the third stage from the top to the second zigzag extending portion 44 in the second stage from the bottom also extend in the circumferential direction while swinging in an axial direction in each stage 14. It exists and extends in the circumferential direction, and is connected to the second extending portion 46 of the second zigzag extending portion 44 in the adjacent stage.

Here, the portion where the corner portion of the boundary between the first extending portion 45 and the second extending portion 46 has a convex shape toward the upper side in FIG. 9 is referred to as a mountain portion, and the first extending portion 45 The portion where the corner portion of the boundary between the surface and the second extending portion 46 has a convex shape toward the lower side in FIG. 9 is referred to as a valley portion.
The second zigzag extending portion 44 on the uppermost stage has a structure of 4.5 mountains. The second zigzag extending portion 44 in the second row from the top and the second zigzag extending portion 44 in the second row from the bottom each have a structure of 3.5 peaks. The second zigzag extending portion 44 at the bottom has a structure of five mountains.

In this way, the first zigzag extension of the portion other than both ends of the specific structure portion 10a is larger than the number of zigzag runouts in the first zigzag extension portion 34 of both end portions (end portions 15a, 15b) of the specific structure portion 10a. The number of zigzag runouts in the unit 34 is small.
Further, in the portions other than both ends of the specific structural portion 10a, the number of zigzag runouts in each of the first zigzag extending portions 34 is equal to each other.

As described above, each of the second zigzag extending portions 44 engages with the second zigzag extending portion 44 of the adjacent stage at the tip of the zigzag swing to form the hook portion 47.
In each hook portion 47, the valley portion of one second zigzag extending portion 44 and the mountain portion of the other second zigzag extending portion 44 each have a loop shape. The valley portion of one second zigzag extending portion 44 and the mountain portion of the other second zigzag extending portion 44 pass through each other's loops, and the extending directions are reversed, so that the hook portion 47 is formed.
Of the valleys of the second zigzag extension 44 of each step 14, the valleys at positions corresponding to the peaks of the second zigzag extension 44 one step below are the corresponding peaks. Engage with each other to form the hook portion 47.

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

As shown in FIG. 9, the portion of the second structure 12 formed by the third portion 42 of the second wire 41 is formed in an oblique lattice pattern in which a blank is partially present.

Next, with reference to FIG. 10, the structure of the portion of the second structure 12 of the specific structure portion 10a that is composed of the fourth portion 43 of the second wire 41 will be described.
In FIG. 10, the fourth portion 43 has one end 43a as a starting end. The one end 43a of the fourth portion 43 is the same as the one end 42a of the third portion 42. That is, in the second wire 41, one portion having one end 42a (one end 33a) as a boundary is the third portion 42 (two-dot chain line portion in FIG. 10), and the other portion is the fourth portion 43 (FIG. 10). The solid line portion in 10.).
As described above, the fourth portion 43 complementarily forms the diagonal grid-like second structure 12 (FIG. 11) with the aggregate of the plurality of second zigzag extending portions 44 (two-dot chain line portion in FIG. 10). It is postponed to compose. That is, the fourth portion 43 extends in a plurality of circumferential directions while swinging in a zigzag in the axial direction and sequentially connecting to the adjacent step 14 in the second structure 12. Then, the fourth portion 43 engages with the second zigzag extending portion 44 at the tip of the zigzag swing to form the hook portion 48.
In each hook portion 48, the peak portion or valley portion of the fourth portion 43 and the peak portion or valley portion of the second zigzag extending portion 44 have a loop shape, respectively, and pass through each other's loops. , The extending direction is reversed.

More specifically, the zigzag shape of the fourth portion 43 is the first extending portion 49 extending diagonally by two steps and the first extending portion 49 from the point where the first extending portion 49 extends. The shape is such that the second extending portion 50, which is folded back in the opposite diagonal direction and extends diagonally by one step, is alternately and repeatedly connected.
In FIG. 10, the first extending portion 49 extends in the downward-sloping direction, and the second extending portion 50 extends in the upward-sloping direction.

The number of the first extending portion 45 and the second extending portion 46 in the second zigzag extending portion 44 of each stage 14 of the second structure 12 is the diameter of the stent 100 or the desired eye of the specific structure portion 10a. It can be changed according to the fineness.
On the other hand, the zigzag shape of the fourth portion 43 of the second structure 12 has a constant shape (a first extending portion 49 extending diagonally by two steps and a first extending portion) regardless of, for example, the diameter of the stent 100. The shape is such that the second extending portion 50, which is folded back diagonally in the opposite direction to the first extending portion 49 and extends diagonally by one step, is alternately and repeatedly connected from the extending end of the 49). Can be done.

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

The second structure 12 is configured as described above.

Here, in the case of the present embodiment, as described above, the first structure 11 and the second structure 12 are braided to each other.
More specifically, as shown in FIG. 12, the second zigzag extending portion 44 passes alternately through the outer surface side and the inner surface side of the first wire 31 each time it swings in a zigzag manner. The structure 11 and the second structure 12 are braided to each other.
In FIG. 12, the first structure 11 (FIG. 8) composed of the first wire 31 is shown in a simplified manner, and each hook portion in the first structure 11 is not shown and is stranded. The formation range of the portion 39 is shown by shading.

As shown in FIG. 12, it is preferable that the size of the mesh in the first structure 11 and the size of the mesh in the second structure 12 are equal to each other.
Further, the mesh in the first structure 11 and the mesh in the second structure 12 are preferably arranged so as to be deviated from each other in the circumferential direction, and further deviate by 1/2 of the size of the mesh in the circumferential direction. preferable.

As shown in FIGS. 1 and 2, the stent 100 comprises X-ray opaque markers (eg, first marker 91, second marker 92, third marker 93 and fourth marker 94).
The marker is configured by winding a thin wire such as gold in a coil shape, and is extrapolated to the first wire 31 or the second wire 41.
The plurality of markers include a first marker 91 provided at least at the base end (the other end) of the first tubular portion 71, and at least the tip end portion of one of the second tubular portions 72. A second marker 92 and a third marker 93 provided at least at the tip of the other second tubular portion 73 are included.
In the case of the present embodiment, the plurality of markers include a fourth marker 94 provided at the base end portion of one of the second tubular portions (for example, the second tubular portion 73).

For example, the first marker 91, the second marker 92, and the third marker 93 are each formed in a shape in which the axial center of the coil extends linearly. The first markers 91 are provided at a plurality of locations in the circumferential direction of the base end portion of the first tubular portion 71, for example. The second markers 92 are provided at a plurality of locations in the circumferential direction of the tip end portion of the second tubular portion 72, for example. The third marker 93 is provided at a plurality of positions in the circumferential direction of the tip end portion of the second tubular portion 73, for example.
For example, the fourth marker 94 is formed in a V shape. The fourth marker 94 is provided, for example, at one position in the circumferential direction of the base end portion of the second tubular portion 73.

The procedure for producing the specific structure portion 10a is not particularly limited, but for example, the specific structure portion 10a can be obtained by producing the first structure 11 first and then the second structure 12.
The first structure 11 may be manufactured by knitting in order from one end (one end 32a) side of the first wire 31, or by knitting in order from the other end (other end 33b) side of the first wire 31. May be good.
Similarly, the second structure 12 may be manufactured by knitting in order from one end (one end 42a) side of the second wire 41, or by knitting in order from the other end (other end 43b) side of the second wire 41. You may make it.

[Second Embodiment]
Next, the second embodiment will be described with reference to FIGS. 13 (a) and 13 (b).
The stent 100 according to the present embodiment is different from the stent 100 according to the first embodiment in the following description, and is otherwise the same as the stent 100 according to the first embodiment. It is configured.

In the case of the present embodiment, the stent 100 further includes a liquid-impermeable tubular body 62 arranged coaxially with the first tubular portion 71. Therefore, the first tubular portion 71 has good resistance to ingrown (invasion of a tumor or the like into the inside of 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 first tubular portion 71 as shown in FIGS. 13 (a) and 13 (b), and conversely, the first tubular portion 71 may cover the outer peripheral surface of the first tubular portion 71. The outer peripheral surface of the tubular body 62 may be covered. Alternatively, the tubular body 62 may be configured by impregnating the network structure of the first tubular portion 71 with a resin material. Further, the tubular body 62 may be arranged at a position sandwiched between the first mesh structure 81a and the second mesh structure 82a. That is, for example, the second mesh structure 82a, the tubular body 62, and the first mesh structure 81a may have a triple structure arranged in this order from the inside in the radial direction. The tubular body 62 is preferably provided over the entire area of the first tubular portion 71 in the axial direction.
The tubular body 62 is not provided on the second tubular portions 72 and 73, for example.

[Third Embodiment]
Next, the third embodiment will be described with reference to FIG.
The stent 100 according to the present embodiment is different from the stent 100 according to the first embodiment in the following description, and is otherwise the same as the stent 100 according to the first embodiment. It is configured.
As shown in FIG. 14, in the case of the present embodiment, the second marker 92 and the third marker 93 are formed in different shapes from each other. Therefore, the second tubular portion 72 and the second tubular portion 73 can be easily distinguished in the living body.
As an example, the second marker 92 is formed in a linear shape as in the first embodiment.
On the other hand, the third marker 93 extends in a spiral shape along the periphery of the second tubular portion 73, for example. More specifically, the third marker 93 is arranged over the entire axial direction of the second tubular portion 73.

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

For example, in the above description, as shown in FIG. 7, the zigzag extending portion 33c is a part of the second portion 33, but the zigzag extending portion 33c is in the first portion 32 (FIG. 6). It may be a part of the first zigzag extending portion 34 on the uppermost stage. That is, the uppermost first zigzag extending portion 34 may be configured to 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 one end 33a shown in FIG.

Further, in the above description, an example in which the first wire 31 constituting the first structure 11 and the second wire 41 constituting the second structure 12 are separate wires has been described, but the first wire 31 and the second wire have been described. 41 may be one part of one wire at a time.
Further, in the above, the example in which the first portion 32 and the second portion 33 are each part of one first wire 31 has been described, but the first portion 32 and the second portion 33 are separate wires. It may be. Further, in the above-described first embodiment, the 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.

Further, in the above, an example has been described in which each of the second tubular portions 72 and 73 is a specific structural portion 10a, and the first tubular portion 71 is composed of the first structure 11 having a double tubular structure. The present invention is not limited to this example, and the first tubular portion 71 may be the specific structural portion 10a. Further, each of the second tubular portions 72 and 73 may be configured by the second structure 12 without including the first structure 11.

Further, the stent 100 according to the third embodiment may include a tubular body 62.

Each of the above embodiments can be appropriately combined without departing from the gist of the present invention.

The present embodiment includes the following technical ideas.
(1) A network-structured stent composed of wires.
Includes a first tubular portion and a pair of second tubular portions branched from one end of the first tubular portion.
The wire includes a first wire and a second wire.
The first wire includes a first portion and a second portion.
At least a part of the stent is a specific structural part in which the network structure includes a first structure and a second structure.
In the specific structural part
The first structure is a diagonal grid formed by the first wire, and includes a plurality of stages arranged at positions deviated from each other in the axial direction.
The first portion includes a plurality of first zigzag extending portions extending in a circumferential direction over a range longer than one round while swinging in a zigzag manner in the axial direction in each stage of the first structure. Including
Each of the first zigzag extending portions includes a first extending portion extending in the first inclined direction and a second extending portion extending in a second inclined direction opposite to the first inclined direction. It has a shape that is alternately and repeatedly connected, and is connected to the first zigzag extending portion of the adjacent stage in the first structure at the end extending in the circumferential direction.
Each of the first zigzag extending portions engages with the first zigzag extending portion of the adjacent stage in the first structure at the tip of the zigzag swing to form a hook portion.
The second extending portion at one end of each first zigzag extending portion is wound around the second extending portion at the other end of the first zigzag extending portion.
The second portion is sequentially wound around the second extending portion of the second extending portion of each first zigzag extending portion, which is arranged on the extension of each other.
The second wire includes a third portion and a fourth portion.
The second structure is an oblique lattice structure composed of the second wire, and includes a plurality of steps arranged at positions deviated from each other in the axial direction.
The third portion includes a plurality of second zigzag extending portions extending in a range of less than one round in the circumferential direction while swinging in a zigzag manner in the axial direction in each stage of the second structure.
Each second zigzag extending portion engages with the second zigzag extending portion of the adjacent stage in the second structure to form a hook portion at the tip of the zigzag swing, and extends in the circumferential direction. At the end, it is connected to the second zigzag extending part of the adjacent stage in the second structure.
The fourth portion sequentially swings in an axial direction in a zigzag manner so as to form the second structure in a complementary manner to an aggregate of the plurality of second zigzag extending portions. A hook portion is formed by engaging with the second zigzag extending portion of the corresponding stage in the second structure at the tip of the zigzag swinging in the circumferential direction while being continuous with the second zigzag extending portion. Stent.
(2) The stent according to (1), wherein the first structure and the second structure are braided to each other in the specific structure portion.
(3) Each time the second zigzag extending portion swings in a zigzag manner, the first structure and the first structure are described in the specific structural portion by alternately passing through the outer surface side and the inner surface side of the first wire. The stent according to (2), wherein the second structure is braided with each other.
(4) The stent according to any one of (1) to (3), wherein each of the second tubular portions is the specific structural portion.
(5) The stent according to (4), wherein the first tubular portion is composed of the first structure having a double tubular structure.
(6) The stent is
A first unit in which a tubular first mesh structure forming a part of the first tubular portion and one of the second tubular portions are integrally formed.
A second unit in which a tubular second mesh structure constituting another part of the first tubular portion and the other second tubular portion are integrally formed.
Is composed of a combination of
The second network structure of the second unit is housed inside the first network structure of the first unit.
The second tubular portion of the second unit projects outward from the first unit through an opening formed in the first unit.
The first structure constituting the first unit is continuously formed from the first network structure to one of the second tubular portions.
The stent according to (5), wherein the first structure constituting the second unit is continuously formed from the second network structure to the other second tubular portion.
(7) Equipped with a plurality of X-ray opaque markers
The plurality of markers
A first marker provided at least at the other end of the first tubular portion, a second marker provided at at least the tip end portion of one of the second tubular portions, and the second tubular portion of the other. The stent according to any one of (1) to (6), which comprises a third marker provided at least at the tip of the portion.
(8) The stent according to (7), wherein the plurality of markers include a fourth marker provided at a proximal end portion of one of the second tubular portions.
(9) The stent according to (7) or (8), wherein the second marker and the third marker are formed in different shapes from each other.
(10) The stent according to any one of (1) to (9), further comprising a liquid-impermeable tubular body arranged coaxially with the first tubular portion.

10 Cylindrical body 10a Specific structure 11 First structure 12 Second structure 13 First structure step 14 Second structure step 15a, 15b End 31 First wire 32 First part 32a One end 32b Another end 32c Folding point 33 Second part 33a One end 33b Another end 33c Zigzag extension 33d End 33e, 33f, 33g, 33h, 33i, 33j, 33k Midpoint
34 1st zigzag extension part (zigzag extension part)
35 1st extending part 36 2nd extending part 36a 2nd extending part at one end 37 Hook part 38, 38a Winding part 39 Twisted part 41 2nd wire 42 3rd part 42a One end 42b Other end 43 4th part 43a One end 43b The other end 44 Second zigzag extension part (zigzag extension part)
45 1st extending part 46 2nd extending part 47, 48 Hook part 49 1st extending part 50 2nd extending part 61 Connecting wire 62 Tubular body 71 1st tubular part 71a Tip 71b Base tip Tip 72 2nd tubular portion 72a, 73a Base end 73 2nd tubular portion 72b, 73b Tip 81 1st unit 81a 1st mesh structure 82 2nd unit 82a 2nd mesh structure 83, 84 Opening 85, 87 Base ends 86, 88 Tip 91 1st marker 92 2nd marker 93 3rd marker 94 4th marker 100 Stent

Claims (10)

A networked stent composed of wires
Includes a first tubular portion and a pair of second tubular portions branched from one end of the first tubular portion.
The wire includes a first wire and a second wire.
The first wire includes a first portion and a second portion.
At least a part of the stent is a specific structural part in which the network structure includes a first structure and a second structure.
In the specific structural part
The first structure is a diagonal grid formed by the first wire, and includes a plurality of stages arranged at positions deviated from each other in the axial direction.
The first portion includes a plurality of first zigzag extending portions extending in a circumferential direction over a range longer than one round while swinging in a zigzag manner in the axial direction in each stage of the first structure. Including
Each of the first zigzag extending portions includes a first extending portion extending in the first inclined direction and a second extending portion extending in a second inclined direction opposite to the first inclined direction. It has a shape that is alternately and repeatedly connected, and is connected to the first zigzag extending portion of the adjacent stage in the first structure at the end extending in the circumferential direction.
Each of the first zigzag extending portions engages with the first zigzag extending portion of the adjacent stage in the first structure at the tip of the zigzag swing to form a hook portion.
The second extending portion at one end of each first zigzag extending portion is wound around the second extending portion at the other end of the first zigzag extending portion.
The second portion is sequentially wound around the second extending portion of the second extending portion of each first zigzag extending portion, which is arranged on the extension of each other.
The second wire includes a third portion and a fourth portion.
The second structure is an oblique lattice structure composed of the second wire, and includes a plurality of steps arranged at positions deviated from each other in the axial direction.
The third portion includes a plurality of second zigzag extending portions extending in a range of less than one round in the circumferential direction while swinging in a zigzag manner in the axial direction in each stage of the second structure.

Each second zigzag extending portion engages with the second zigzag extending portion of the adjacent stage in the second structure to form a hook portion at the tip of the zigzag swing, and extends in the circumferential direction. At the end, it is connected to the second zigzag extending part of the adjacent stage in the second structure.
The fourth portion sequentially swings in an axial direction in a zigzag manner so as to form the second structure in a complementary manner to an aggregate of the plurality of second zigzag extending portions. A hook portion is formed by engaging with the second zigzag extending portion of the corresponding stage in the second structure at the tip of the zigzag swinging in the circumferential direction while being continuous with the second zigzag extending portion. Stent. The stent according to claim 1, wherein the first structure and the second structure are braided to each other in the specific structure portion. Each time the second zigzag extending portion swings in a zigzag manner, the first structure and the second structure are alternately passed through the outer surface side and the inner surface side of the first wire. The stent according to claim 2, wherein the stents are braided with each other. The stent according to any one of claims 1 to 3, wherein each of the second tubular portions is the specific structural portion. The stent according to claim 4, wherein the first tubular portion is composed of the first structure having a double tubular structure. The stent is
A first unit in which a tubular first mesh structure forming a part of the first tubular portion and one of the second tubular portions are integrally formed.
A second unit in which a tubular second mesh structure constituting another part of the first tubular portion and the other second tubular portion are integrally formed.
Is composed of a combination of
The second network structure of the second unit is housed inside the first network structure of the first unit.
The second tubular portion of the second unit projects outward from the first unit through an opening formed in the first unit.
The first structure constituting the first unit is continuously formed from the first network structure to one of the second tubular portions.
The stent according to claim 5, wherein the first structure constituting the second unit is continuously formed from the second network structure to the other second tubular portion. Equipped with multiple X-ray opaque markers
The plurality of markers
A first marker provided at least at the other end of the first tubular portion, a second marker provided at at least the tip end portion of the second tubular portion, and the second tubular portion of the other. The stent according to any one of claims 1 to 6, wherein a third marker provided at least at the tip of the portion is included. The stent according to claim 7, wherein the plurality of markers include a fourth marker provided at a proximal end portion of one of the second tubular portions. The stent according to claim 7 or 8, wherein the second marker and the third marker are formed in different shapes from each other. The stent according to any one of claims 1 to 9, further comprising a liquid-impermeable tubular body arranged coaxially with the first tubular portion.