JP2020092948A - Anchor stent - Google Patents

Abstract

To provide an anchor stent capable of suppressing backflow of a fluid.SOLUTION: An anchor stent 1 includes a long cylindrical body 1a, two flange parts 1b and 1ba spaced apart in the longitudinal direction of the cylindrical body 1a, and a resin film 1c constituting at least the cylindrical body 1a. One flange part 1b out of the two flange parts 1b and 1ba includes an extension part 1d continued at least one portion in a circulating direction of the cylindrical body 1a so as to extend in the longitudinal direction of the cylindrical body 1a. The extension part 1d is so formed as to communicate an aperture 1f of the flange part 1b to the outside and is provided at only one flange part 1b, however, when the extension part is provided at the other flange part 1ba, in the longitudinal direction of the cylindrical body 1a, it extends to the outside longer than the other extension part provided at the other flange part 1ba.SELECTED DRAWING: Figure 1

Description

The present invention relates to an anchor stent that connects living organs.

Generally, when bile ducts, pancreatic ducts, etc. are obstructed by gallstones, tumors, inflammation, etc., bile duct drainage or pancreatic duct drainage is performed to drain bile or pancreatic juice out of the body. Furthermore, when it is difficult to access the Vater papilla with a catheter using an endoscope due to stenosis due to a tumor, etc., to connect multiple biological organs (between organs) to form a bypass for passing bile or pancreatic juice. In some cases, anchor stents are used.

For example, Patent Document 1 discloses an anchor stent (in the document, described as a bypass stent) capable of suppressing the movement of organs while connecting them.
Specifically, the anchor stent disclosed in Patent Document 1 includes an elongated tubular main body portion, and hooking portions provided at both ends of the main body portion and formed of elastic linear members. Then, the movement of the anchor stent can be suppressed by bringing the distal end portion of the hooking portion into contact with the inner wall of the luminal organ.

JP, 2005-66221, A

In the anchor stent disclosed in Patent Document 1, since the hooking portion is formed in a linear shape, it is possible for a fluid such as food to pass through the hooking portion, and the reverse flow to the main body portion (with respect to the drainage direction) The reverse flow) could not be suppressed appropriately.
The present invention has been made in view of the above problems, and an object thereof is to provide an anchor stent capable of suppressing the backflow of a fluid.

The anchor stent of the present invention comprises a long tubular body, two flange portions provided at intervals in the longitudinal direction of the tubular body, and at least a resin film constituting the tubular body. An anchor stent for connecting the living organs, wherein the tubular body is passed through insertion holes provided in each of adjacent living organs, and the two flange portions are engaged with each other. An opening that communicates with the internal space of the tubular body is formed in each of the two flange portions, and at least one of the two flange portions has a circumferential direction of the tubular body. At least a portion is provided with an extending portion continuously extending in the longitudinal direction of the tubular body, the extending portion is formed so as to communicate the opening and the outside, When provided only on the one flange portion or when the extension portion is provided on the other flange portion, it is provided on the other flange portion in the longitudinal direction of the tubular body. It is characterized in that it extends to the outside longer than the other extending portion.

The anchor stent of the present invention having the above-described configuration tries to flow from the outside into the opening of the one flange portion while allowing the flow of the fluid from the outside toward the one flange portion side through the other flange portion. The flow (backflow) of the flowing fluid can be suppressed by the extending portion.

It is a typical side view showing the anchor stent concerning a 1st embodiment. It is explanatory drawing which shows the biological organ which an anchor stent connects. It is a typical side view which shows the anchor stent which concerns on 2nd Embodiment. It is a typical side view which shows the anchor stent which concerns on 3rd Embodiment. It is a typical side view showing the anchor stent concerning a 4th embodiment. It is a typical side view showing the anchor stent concerning a 5th embodiment. It is a typical side view showing the anchor stent concerning a 6th embodiment.

Hereinafter, an anchor stent according to an embodiment of the present invention will be described with reference to the drawings.
The embodiments described below are merely examples for facilitating the understanding of the present invention, and do not limit the present invention. That is, the shapes, dimensions, and arrangements of the members described below can be changed and improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.
Further, in all the drawings, the same components are denoted by the same reference numerals, and the duplicated description will be appropriately omitted.

<First Embodiment>
<Outline>
First, the outline of the anchor stent of the present invention will be described with reference to FIGS. 1 and 2 by taking the anchor stent 1 according to the first embodiment as an example. FIG. 1 is a schematic side view showing an anchor stent 1 according to the first embodiment, and FIG. 2 is an explanatory view showing a living organ (organ) to which the anchor stent 1 is connected. It should be noted that FIG. 2 shows an example of a living organ that can be connected by the anchor stent 1, and does not explain that a plurality of anchor stents 1 are used at the same time. In addition, in FIG. 2, the flange portions 1b and 1ba of the anchor stent 1 are omitted.

The anchor stent 1 according to the present embodiment includes an elongated tubular body 1a, two flange portions 1b and 1ba provided at intervals in the longitudinal direction of the tubular body 1a, and at least the tubular body 1a. The resin film 1c which comprises it. The tubular body 1a is passed through insertion holes 5a and 7a provided in the living organs (for example, the gallbladder 5 and the duodenum 7) adjacent to each other. In the anchor stent 1, the two flange portions 1b and 1ba are engaged with a living organ (for example, the inner wall of the gallbladder 5 and the inner wall of the duodenum 7) while the tubular body 1a is inserted through the insertion holes 5a and 7a. , The body organs (for example, the gallbladder 5 and the duodenum 7) are connected.
Each of the two flange portions 1b and 1ba is formed with an opening 1f communicating with the internal space of the tubular body 1a. In the present embodiment, one of the two flange portions 1b and 1ba is formed. The extension 1d is provided in the portion 1b.
The extension portion 1d extends continuously in at least a part of the tubular body 1a in the circumferential direction and extends in the longitudinal direction of the tubular body 1a so that the opening 1f communicates with the outside (the extension portion 1d). 1d opening 1g) is formed. The extending portion 1d according to the present embodiment is provided only on the one flange portion 1b, but when the extending portion 1d is provided on the other flange portion 1ba, it is provided on the other flange portion 1ba. It is characterized in that it extends to the outside in the longitudinal direction of the tubular body 1a longer than the other extended portion.

According to the above configuration, while allowing the flow of the fluid from the outside through the other flange portion 1ba toward the one flange portion 1b side, it tries to flow from the outside into the opening 1f of the one flange portion 1b. The flow (backflow) of the fluid can be suppressed by the extension portion 1d.

More specifically, by extending the extending portion 1d, the opening 1g of the extending portion 1d connected to the opening 1f of the flange portion 1b is engaged with the inner wall of the living body organ and the flange portion 1b. Can be separated from. Therefore, it is possible to prevent the fluid flowing along the inner wall of the living body organ and the flange portion 1b engaging with the inner wall from flowing into the opening 1f through the opening 1g.
In particular, by disposing the extending portion 1d so as to face the downstream side of the fluid, the fluid contacting the side surface of the extending portion 1d can be received away in the direction away from the opening 1g, which is more preferable. Backflow can be prevented.

As shown in FIG. 2, the anchor stent 1 has a structure in which a plurality of biological organs (inter-organs) are connected to each other when it is difficult to access a catheter (not shown) to a papilla of Vater (not shown) through an endoscope due to a tumor T or the like. A) to form a bypass to connect bile and pancreatic juice.
Specifically, the anchor stent 1 is an insertion hole 2a provided in each of the adjacent living organs such as the stomach 2 and the liver 3, the stomach 2 and the pancreatic duct 6, the bile duct 4 and the duodenum 7, or the gallbladder 5 and the duodenum 7. The tubular body 1a is passed through 3a, 4a, 5a, 6a, and 7a to connect these living organs. The above-mentioned regurgitation of a fluid means that a digested material (fluid) such as food flows into the liver 3, the bile duct 4, the gallbladder 5 or the pancreatic duct 6 from the stomach 2 or the duodenum 7.

The anchor stent 1 connects each living organ so that bile or pancreatic juice flows from the flange portion 1ba to the extension portion 1d.
The extension 1d may have a backflow prevention function and is not limited to being formed over the entire circumference. For example, the extension 1d is formed into a plurality of strips by forming slits. It may be one.

The "openings" formed in the flange portion and the extending portion are not limited to those formed by extending the inner cavity of the tubular body.
That is, the “open hole” may be communicated with the inner cavity of the tubular body so as to allow the flow of the fluid. Specifically, even if the flange portion or the extending portion is provided so as to close the inner cavity of the tubular body, the closing portion is made of a mesh wire, so that the fluid can be circulated. The open part of the wire that is possible is also included in the "open hole".
The "insertion hole" may be a through hole or a bottomed hole. When the insertion hole is a bottomed hole, the anchor stent has its end inserted into the bottomed hole of the tissue of the living body organ, for example, to pass the tissue fluid exuding from the tissue to the adjacent living body organ. Function as a thing.

<Structure>
Next, with reference to FIG. 1, a detailed configuration of the anchor stent 1 will be described. The anchor stent 1 has a tubular body 1a, two flange portions 1b and 1ba at both ends of the tubular body 1a, and one flange portion 1b extending outward in the longitudinal direction of the tubular body 1a. And an extending portion 1d.
For example, the anchor stent 1 is formed by deforming a laser-cut cylindrical mesh to form the flange portions 1b and 1ba, and then heat-treating it to maintain its shape. ..

Alternatively, the anchor stent 1 may be formed by weaving a metal wire having a shape memory property such as nitinol and performing a heat treatment to maintain the shape.
If such a metal wire is woven, it is possible to integrally and continuously form the tubular body 1a and the flange portions 1b and 1ba, and the anchor having a better shape retention property. It becomes possible to form the stent 1.

The tubular body 1a, the two flange portions 1b, 1ba, and the extending portion 1d of the anchor stent 1 according to the present embodiment are configured to include, for example, a resin film 1c made of silicon. The inner space 1e and the openings 1f and 1g have the same inner diameter (including substantially the same inner diameter, and the radius r so that the bile or pancreatic juice flows smoothly through the inner space 1e and the openings 1f and 1g. ).

For example, when the resin film 1c is formed by immersing the mesh (wire) in the molten resin, the thickness of the tubular body 1a and the flange portion 1b are divided into a portion covering the mesh (wire) and a portion not covering the mesh. The thickness of 1ba may not be uniform. In such a case, “the inner space 1e and the inner diameters of the openings 1f and 1g have the same inner diameter” is the same when comparing the portions that cover the mesh (wire) or the portions that do not cover the same. Means there is.
In other words, in any cross section including the axis of the anchor stent 1, between the tubular body 1a and the flange portions 1b and 1ba, a virtual line segment that connects the axis sides of a plurality of portions covering the mesh (wire) or Virtual line segments connecting the portions that do not cover this are formed to be continuous.

It is preferable that the extension 1d extends longer than the radial dimension of the opening 1f. Specifically, it is preferable that the extending portion 1d extends in the length L1 longer than the radius r of the opening 1f in FIG. In the present embodiment, as shown in FIG. 1, the length L1 is a length (cylindrical shape) along the inner side surface of the extending portion 1d from the inner edge connected to the flange portion 1b to the inner edge on the end face. The length of the body 1a in the axial direction).
In this way, the extending portion 1d extends longer than the radius r of the opening 1f, so that the opening 1f is sealed when the extending portion 1d bends in the diameter reducing direction. It is possible to suppress the backflow of the fluid.
The flanges 1b and 1ba according to the present embodiment are schematically shown in an angular shape, but a chamfered shape with a rounded shape and no corners is suitable for placement in a living body. Needless to say, the same applies to other embodiments.

<Second Embodiment>
Next, with reference to FIG. 3, a detailed configuration of the anchor stent 11 according to the second embodiment will be described. FIG. 3 is a schematic side view showing the anchor stent 11 according to the second embodiment.
The extending portion 11d, which is a characteristic configuration of the anchor stent 11, has at least a part of a flare portion 11h having a shape in which the diameter increases toward the outside in the longitudinal direction of the tubular body 1a. The flare portion 11h is formed with the same thickness as that of the tubular body 1a, and has an opening 11g forming an inner cavity of the flare portion 11h, an opening 1f of the flange portion 1b, and an internal space 1e of the tubular body 1a. And are smoothly continuous.

In this way, since the extending portion 11d has the flare portion 11h, the flow of the fluid contacting the flare portion 11h can be directed in a direction away from the opening 11g, and the fluid flows into the opening 11g. Can be suppressed.
Further, since the space inside the extending portion 11d is larger than that of the extending portion 1d due to the flare portion 11h, the fluid flowing from the tubular body 1a to the outside via the extending portion 11d extends to the extending portion. It is possible to suppress clogging inside 11d.
Although FIG. 3 shows an example in which the entire extension 11d is flared to form the flare 11h, the flare 11h is formed on at least a portion of the extension 11d. It may be one.

It is preferable that the extending portion 11d extends longer than the radial dimension of the opening 1f. Specifically, it is preferable that the extending portion 11d extends in the length L2 longer than the radius r of the opening 1f in FIG.
In the present embodiment, as shown in FIG. 3, the length L2 is a length along the outer side surface of the flared extending portion 11d from the outer edge connected to the flange portion 1b to the outer edge on the end face. Is.
In other words, the length L2 is a length along the inner side surface of the extending portion 11d from the inner edge of the opening 11g connected to the flange portion 1b to the outer edge of the opening 11g on the end surface.
In this way, since the extending portion 11d extends longer than the radius r of the opening 1f, the opening 1f is sealed when the extending portion 11d bends in the diameter reducing direction. It is possible to suppress the backflow of the fluid.
Except for the above description, the anchor stent 1 and the anchor stent 11 are common, and the description thereof is omitted. The same applies to the following embodiments.

<Third Embodiment>
Next, with reference to FIG. 4, a detailed configuration of the anchor stent 12 according to the third embodiment will be described. FIG. 4 is a schematic side view showing the anchor stent 12 according to the third embodiment.
The extending portion 12d, which is a characteristic configuration of the anchor stent 12, has, in at least a part thereof, a tapered portion 12h having a shape in which the diameter is reduced toward the outside in the longitudinal direction of the tubular body 1a.

As described above, since the extending portion 12d has the tapered portion 12h, it is possible to enhance the backflow preventing function of suppressing the fluid from flowing from the outside toward the opening 1f of the flange portion 1b. Specifically, when the fluid comes into contact with the tapered portion 12h and pushes the tapered portion 12h, a force is applied to the tapered portion 12h in the diameter reducing direction, and the opening 12g of the tapered portion 12h is narrowed. Therefore, it is possible to prevent the fluid from flowing into the opening 12g.
Although FIG. 4 shows an example in which the entire extended portion 12d is formed in a tapered shape to form the tapered portion 12h, the tapered portion 12h is formed in at least a part of the extended portion 12d. It may be one.

The extending portion 12d extends longer than the radial dimension of the opening 1f. Specifically, in FIG. 4, the extending portion 12d extends with a length L3 that is longer than the radius r of the opening 1f.
In the present embodiment, as shown in FIG. 4, the length L3 is a length along the outer surface of the tapered extending portion 12d from the outer edge connected to the flange portion 1b to the outer edge on the end surface. Is.
In other words, the length L3 is a length along the inner side surface of the extending portion 12d from the inner edge of the opening 12g connected to the flange portion 1b to the outer edge of the opening 12g on the end face.
In this way, the extending portion 12d extends longer than the radius r of the opening 1f, so that the opening 1f is sealed when the extending portion 12d bends in the diameter reducing direction. It is possible to suppress the backflow of the fluid.

<Fourth Embodiment>
Next, with reference to FIG. 5, a detailed configuration of the anchor stent 13 according to the fourth embodiment will be described. FIG. 5 is a schematic side view showing the anchor stent 13 according to the fourth embodiment.
The extending portion 13d has at least a part of a straight tubular portion 13i extending in the longitudinal direction of the tubular body 1a. In particular, the extending portion 13d according to the present embodiment is continuous with the straight tube portion 13i formed continuously on the side connected to the flange portion 1b and the end portion of the straight tube portion 13i opposite to the flange portion 1b side. And a flare portion 11h formed in this way.

As described above, since the extending portion 13d includes the straight cylindrical portion 13i, the extending length can be increased while suppressing the radial deformation of the flare portion 11h, and thus the extending portion can be located at a desired position. It becomes easy to arrange the end portion of 13d. In particular, even when the flange portion 1b is buried in a part of the living body organ, by having the straight tube portion 13i, the end portion of the extending portion 13d is separated from the part of the living body organ, and the flow passage of the fluid is formed. Can be secured.
Although FIG. 5 shows a configuration in which the flare portion 11h is connected to the end of the straight tubular portion 13i, the present invention is not limited to such a configuration, and the tapered portion 12h is provided at the end of the straight tubular portion 13i. It may be connected.

<Fifth Embodiment>
Next, with reference to FIG. 6, details of the configuration of the anchor stent 14 according to the fifth embodiment will be described. FIG. 6 is a schematic side view showing the anchor stent 14 according to the fifth embodiment.
The tubular body 14a and the extending portion 14d according to the present embodiment have a mesh structure formed by intertwining a plurality of wires 14j extending in one direction and a plurality of wires 14k extending in a direction intersecting the one direction. It is configured. The extending portion 14d is formed by a weaving method different from the weaving method of the wires 14j and 14k that form the tubular body 14a and the flange portions 14b and 14ba.

As an example, the wires 14j and 14k in the extending portion 14d in the present embodiment are woven in a smaller number than the wires 14j and 14k in the tubular body 14a.
In this way, the bending rigidity of the extending portion 14d can be adjusted (decreased) by making the knitting methods of the wires 14j and 14k different between the tubular body 14a and the extending portion 14d.

For example, by lowering the bending rigidity of the extension portion 14d, it is possible to avoid the extension portion 14d of the anchor stent 14 from obstructing the flow of food digests or the like from the stomach 2 through the duodenum 7 toward the small intestine.
Further, by lowering the bending rigidity, the extending portion 14d is bent and deformed when the flow on the reverse flow side from the extending portion 14d toward the tubular body 14a is generated, so that the opening 14g is easily closed, The fluid can be prevented from flowing into the tubular body 14a through the opening 14g.
Here, the different knitting method includes not only the number of wires 14j and 14k being different, but also the difference in the tightening load related to the entanglement (entangled portion 14m) at the intersection of the adjacent wires 14j and 14k.

In addition, the tubular body 14a and the extending portion 14d have an entangled portion 14m in which adjacent wires 14j and 14k are intertwined with each other.
In particular, the entangled portion 14m of the wires 14j and 14k in the extending portion 14d according to the present embodiment is arranged more sparsely than the entangled portion 14m of the wires 14j and 14k in the tubular body 14a. Here, “sparsely arranged” refers to a case in which the intervals between the crevices 14m of the mesh formed by the wires 14j and 14k are large, and a case in which the sides of each lattice of the mesh are long.
According to the above configuration, the entangled portions 14m of the wires 14j and 14k of the extending portion 14d are sparsely arranged, so that the bending rigidity of the extending portion 14d is reduced while ensuring the bending rigidity of the tubular body 14a. be able to.
Bending rigidity can be reduced because the movement allowable range of the wires 14j and 14k in the entangled portion 14m (entangled line) is wide. Here, the entangled portion 14m includes not only the seam to be fastened as the closed space of the one wire 14j, 14k, but also the entanglement in which the one wire 14j, 14k is engaged without forming the closed space.

That is, the extending portion 14d according to the present embodiment has lower bending rigidity than the tubular body 14a.
In this way, since the bending rigidity of the extending portion 14d is lower than the bending rigidity of the tubular body 14a, the shape of the tubular body 14a that passes through the insertion holes (2a, 3a, 4a, 5a, 6a, 7a) is retained. At the same time, since the extending portion 14d is bent, the backflow of the fluid can be prevented.

<Sixth Embodiment>
Next, the details of the configuration of the anchor stent 15 according to the sixth embodiment will be described mainly with reference to FIG. 7. FIG. 7 is a schematic side view showing the anchor stent 15 according to the sixth embodiment.
The resin film 15c of the anchor stent 15 according to the present embodiment extends from the tubular body 15a over one flange portion 15b. Then, a part or all of the extended portion 15d of the anchor stent 15 is formed by the resin film 15c. On the other hand, the wires 14j and 14k according to the present embodiment (see FIG. 6) terminate at the flange portion 15b and are not arranged at the extending portion 15d.
The wire according to the present invention is not limited to such a structure. That is, the wires 14j and 14k may extend beyond the flange portion 15b and be disposed in a part of the extending portion 15d.
In this way, since the extending portion 15d includes at least a part where the extending portion 15d is formed only by the resin film 15c, the extending portion 15d is formed by the wire (14j, 14k) and the resin film 15c. It can be bent more easily than the body 15a.

That is, the extending portion 15d has lower bending rigidity than the tubular body 15a.
In this way, since the bending rigidity of the extending portion 15d is lower than the bending rigidity of the tubular body 15a, the shape of the tubular body 15a passing through the insertion holes (2a, 3a, 4a, 5a, 6a, 7a) is retained. At the same time, the extension portion 15d is bent, so that the backflow of the fluid can be prevented.

The above embodiment includes the following technical ideas.
(1) A long tubular body,
Two flange portions provided at intervals in the longitudinal direction of the tubular body,
At least a resin film constituting the tubular body,
An anchor stent for connecting the living organs, wherein the tubular body is passed through the insertion holes provided in each of the adjacent living organs, and the two flange portions are engaged with each other.
Each of the two flange portions is formed with an opening communicating with the internal space of the tubular body,
At least one of the two flange portions is provided with an extending portion that extends in the longitudinal direction of the tubular body continuously with at least a part of the tubular body in the circumferential direction. ,
The extending portion is formed so as to communicate the opening and the outside, and is provided only on the one flange portion, or the extending portion is provided on the other flange portion. In the longitudinal direction of the tubular body, the anchor stent is characterized in that it extends outwardly longer than the other extension portion provided on the other flange portion in the longitudinal direction.
(2) The anchor stent according to (1), wherein the extending portion has at least a portion of a flare portion having a shape in which the diameter increases toward the outside in the longitudinal direction of the tubular body.
(3) The anchor according to (1) or (2), wherein the extending portion has, in at least a part thereof, a tapered portion having a shape in which the diameter is reduced toward the outside in the longitudinal direction of the tubular body. Stent.
(4) The anchor stent according to (2) or (3), wherein the extending portion has at least a part of a straight tubular portion extending in the longitudinal direction of the tubular body.
(5) The anchor stent according to any one of (1) to (4), wherein the extending portion extends longer than a radial dimension of the opening.
(6) The anchor stent according to any one of (1) to (5), wherein the extending portion has a bending rigidity lower than that of the tubular body.
(7) The tubular body and the extending portion have a mesh structure formed by intertwining wires,
The anchor stent according to (6), wherein the extending portion is formed by a knitting method different from a knitting method of a wire forming the tubular body.
(8) The tubular body and the extending portion have an entangled portion in which the adjacent wires are entangled with each other,
The anchor stent according to (7), wherein the entangled portion of the wire in the extending portion is arranged more sparsely than the entangled portion of the wire in the tubular body.
(9) The resin film extends from the tubular body over the one flange portion,
The said extension part is an anchor stent as described in any one of (1) to (8) formed of the said resin film.

DESCRIPTION OF SYMBOLS 1 Anchor stent 1a Cylindrical body 1b, 1ba Flange part 1c Resin film 1d Extension part 1e Internal space 1f, 1g Open hole 2 Stomach (living organ)
2a Insertion hole 3 Liver (living organ)
3a insertion hole 4 bile duct (living organ)
4a insertion hole 5 gallbladder (living organ)
5a insertion hole 6 pancreatic duct (living organ)
6a insertion hole 7 duodenum (living organ)
7a Insertion hole 11 Anchor stent 11d Extension part 11g Open hole 11h Flare part 12 Anchor stent 12d Extension part 12g Open hole 12h Tapered part 13 Anchor stent 13d Extension part 13i Straight tubular part 14 Anchor stent 14a Cylindrical body 14b, 14ba Flange Part 14d Extension part 14g Open hole 14j, 14k Wire 14m Entangled part 15 Anchor stent 15a Cylindrical body 15b Flange part 15c Resin film 15d Extension part T Tumor

Claims (9)

A long tubular body,
Two flange portions provided at intervals in the longitudinal direction of the tubular body,
At least a resin film constituting the tubular body,
An anchor stent for connecting the living organs, wherein the tubular body is passed through the insertion holes provided in each of the adjacent living organs, and the two flange portions are engaged with each other.
Each of the two flange portions is formed with an opening communicating with the internal space of the tubular body,
At least one of the two flange portions is provided with an extending portion that extends in the longitudinal direction of the tubular body continuously with at least a part of the tubular body in the circumferential direction. ,
The extending portion is formed so as to communicate the opening and the outside, and is provided only on the one flange portion, or the extending portion is provided on the other flange portion. In the longitudinal direction of the tubular body, the anchor stent is characterized in that it extends outwardly longer than the other extension portion provided on the other flange portion in the longitudinal direction. The anchor stent according to claim 1, wherein the extending portion has, in at least a part thereof, a flare portion having a shape in which the diameter is increased toward the outside in the longitudinal direction of the tubular body. The anchor stent according to claim 1 or 2, wherein the extending portion has, in at least a part thereof, a tapered portion having a shape that is reduced in diameter toward the outside in the longitudinal direction of the tubular body. The anchor stent according to claim 2 or 3, wherein the extending portion has a straight tubular portion extending in the longitudinal direction of the tubular body in at least a part thereof. The anchor stent according to any one of claims 1 to 4, wherein the extending portion extends longer than a radial dimension of the opening. The anchor stent according to any one of claims 1 to 5, wherein the extending portion has a bending rigidity lower than that of the tubular body. The tubular body and the extending portion are configured by a mesh structure formed by intertwining wires,
The anchor stent according to claim 6, wherein the extending portion is formed by a knitting method different from a knitting method of a wire forming the tubular body. The tubular body and the extending portion have an entangled portion in which the adjacent wires are intertwined,
The anchor stent according to claim 7, wherein the entangled portion of the wire in the extending portion is arranged more sparsely than the entangled portion of the wire in the tubular body. The resin film extends from the tubular body over the one flange portion,
The anchor stent according to any one of claims 1 to 8, wherein the extending portion is formed of the resin film.

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