阅读说明：本技术 支架以及支架中的线材的固定方法 (Stent and method for fixing wire in stent ) 是由 西岸诚 于 2020-06-05 设计创作，主要内容包括：本发明提供一种支架以及支架中的线材的固定方法,将支架的交叉部分固定。在多根线材编织成螺旋状而形成的支架中,在线材交叉的部分,通过具有橡胶弹性的固定用材料将交叉的两根线材固定。(The invention provides a stent and a method for fixing wires in the stent, which fixes the cross part of the stent. In a stent formed by weaving a plurality of wires in a spiral shape, two crossed wires are fixed to a portion where the wires cross each other by a fixing material having rubber elasticity.)

1. A stent formed by a plurality of wires woven in a spiral shape,

the two intersecting wires are fixed to the intersecting portions by a fixing material having rubber elasticity.

2. The holder according to claim 1,

the crossing portions of the wires located near both ends of the stent are fixed by the fixing material.

3. The holder according to claim 1,

the crossing portions of the wires located near both ends of the stent and the crossing portions of the wires located in the central portion of the stent are fixed by the fixing material.

4. The holder according to claim 1,

the crossing portions of all the wires are fixed by the fixing material.

5. The holder according to any one of claims 1 to 4,

the fixing material is a material having rubber elasticity such as a resin having shape memory properties and a bioabsorbable resin.

6. A method of fixing wires in a stent for fixing wires of a stent formed by weaving a plurality of wires in a spiral shape,

the two intersecting wires are fixed to the intersecting portions by a fixing material having rubber elasticity.

7. The method of claim 6, wherein the wire is fixed to the stent,

the crossing portions of the wires located near both ends of the stent are fixed by the fixing material.

8. The method of claim 6, wherein the wire is fixed to the stent,

the crossing portions of the wires located near both ends of the stent and the crossing portions of the wires located in the central portion of the stent are fixed by the fixing material.

9. The method of claim 6, wherein the wire is fixed to the stent,

the crossing portions of all the wires are fixed by the fixing material.

10. The method of fixing a wire in a stent according to any one of claims 6 to 9,

the fixing material is a material having rubber elasticity such as a resin having shape memory properties and a bioabsorbable resin.

Technical Field

The present invention relates to a stent and a method of fixing a wire in the stent.

Background

The following medical stents are known. The stent is formed by weaving a plurality of wires in a spiral shape (see patent document 1).

Patent document 1: japanese patent laid-open publication No. 2012-223209

In general, in a stent in which wires are woven, since the wires are not fixed to each other but independent from each other, frays may occur at both ends and the shape may be deformed when the stent is manufactured. Further, the wire may be displaced in the catheter during the delivery of the stent. Further, when the stent is expanded, the expansion force may be insufficient only by the expansion using the elasticity of the wire material. However, no research has been made on techniques for solving these problems.

Disclosure of Invention

According to a first aspect of the present invention, there is provided a stent formed by a plurality of wires being woven in a spiral shape, wherein two crossed wires are fixed to a portion where the wires cross by a fixing material having rubber elasticity.

According to a second aspect of the present invention, in the stent of the first aspect, the intersecting portions of the wires located in the vicinity of both ends of the stent are fixed by the fixing material.

According to a third aspect of the present invention, in the stent of the first aspect, the intersecting portions of the wires located in the vicinity of both ends of the stent and the intersecting portions of the wires located in the central portion of the stent are fixed by a fixing material.

According to a fourth aspect of the present invention, in the stent of the first aspect, the intersecting portions of all the wires are fixed by a fixing material.

According to a fifth aspect of the present invention, in the stent of any one of the first to fourth aspects, the fixing material is a material having rubber elasticity such as a resin having shape memory properties, a bioabsorbable resin, or the like.

According to a sixth aspect of the present invention, there is provided a method of fixing wires in a stent, the method being used for fixing wires of a stent formed by braiding a plurality of wires in a spiral shape, wherein two crossed wires are fixed to a portion where the wires cross each other by a fixing material having rubber elasticity.

According to a seventh aspect of the present invention, in the method of fixing wires in the stent of the sixth aspect, the intersecting portions of the wires located near both ends of the stent are fixed by a fixing material.

According to an eighth aspect of the present invention, in the method of fixing wires in a stent of the sixth aspect, intersecting portions of the wires located near both ends of the stent and intersecting portions of the wires located in a central portion of the stent are fixed by a fixing material.

According to a ninth aspect of the present invention, in the method for fixing wires in a stent of the sixth aspect, the intersecting portions of all the wires are fixed by the fixing material.

According to a tenth aspect of the present invention, in the method of fixing a wire in a stent according to any one of the sixth to ninth aspects, the fixing material is a material having rubber elasticity such as a resin having shape memory properties, a bioabsorbable resin, or the like.

According to the present invention, in the portion where the wires intersect, the two intersecting wires are fixed by the fixing material having rubber elasticity, so that fraying at both ends can be prevented in the production of the stent. In addition, the wires in the catheter can be prevented from being displaced even when the stent is delivered. Further, even when the stent is expanded by only the elasticity of the wire material and the expansion force is insufficient, the stent can be uniformly expanded by assisting the expansion of the stent with the fixing material having rubber elasticity.

Drawings

Fig. 1 is a view schematically showing the shape of a stent.

Fig. 2 is a view schematically showing a state in which frays are generated at both ends of the stent.

Fig. 3 is a diagram schematically showing a state in which the mark is shifted.

Fig. 4 is a view schematically showing a state in which two intersecting wires are fixed at a portion where the wires intersect.

Fig. 5 is a view schematically showing a fixing portion using a fixing material.

Fig. 6 is a view showing a modification of the fixing portion of the wire rod.

Fig. 7 is a first diagram showing a modification of the method of fixing the wire rod.

Fig. 8 is a second diagram showing a modification of the method of fixing the wire rod.

Fig. 9 is a third diagram showing a modification of the method of fixing the wire rod.

Detailed Description

FIG. 1 is a schematic view showing the shape of a stent (stent). In the present embodiment, as shown in fig. 1, a stent in which a plurality of wires are woven in a spiral shape is assumed. The wire (element wire) is made of a metal such as stainless steel, a Co — Cr alloy (cobalt chromium alloy), or a Ni — Ti alloy (nickel titanium alloy).

The stent is formed by spirally weaving a plurality of metal wires in a spiral shape as described above, and the number of wires constituting the stent is various. For example, there are a stent having a 16-wire structure in which 16 wires are woven, a stent having a 24-wire structure in which 24 wires are woven, and a stent having a 32-wire structure in which 32 wires are woven. In addition, a 16-piece structural stent is shown in fig. 1.

In such a stent formed by weaving a plurality of metal wires in a spiral shape, since both ends of the wire are not fixed and independent in general, frays may occur at both ends when the stent is manufactured, as shown in fig. 2. Thus, if a stent having frays at both ends is used, the shape may be deformed when the stent is expanded.

In addition, the wire may be displaced in the catheter during the stent delivery, and in this case, the marks fixed to both ends of the wire may be displaced. For example, while the marks 3a to 3f are not shifted as shown in fig. 3 (a) in a normal state, the marks 3a and 3e are shifted due to the shift of the wire in the example shown in fig. 3 (B).

Further, when the stent is expanded, the expansion force may be insufficient only by the expansion using the elasticity of the wire material. That is, in the central portion (middle portion) of the stent, in addition to the expansion force of the wire material in the portion, an expansion force is applied from both sides, and therefore, a sufficient expansion force can be obtained. On the other hand, in both end portions of the stent, although an expansion force is applied from the central side, the expansion force is not applied from the end portions, and therefore, a sufficient expansion force cannot be obtained, and there is a possibility that problems such as insufficient or uneven expansion of the end portions of the stent occur.

In order to solve the above-described various problems, in the present embodiment, as shown in fig. 4, the stent 10 fixes two crossing wires at a portion where the wires cross. Fig. 4 is a diagram schematically showing a state in which the crossing portions of the wires are fixed using the fixing materials 4a to 4j in the stent during expansion, and shows a state in which the crossing portions are fixed to the vicinities of both ends of the stent 10. In addition, when the intersecting portions located near both ends of the stent 10 are fixed, as shown in fig. 4, the intersecting portions located at the 2 nd and 3 rd rows from the end of the stent 10 may be fixed.

By fixing the intersections near the opposite ends of the stent 10 in this manner, frays at the opposite ends of the stent can be prevented as shown in fig. 2. In addition, since the wire in the catheter can be prevented from being displaced during stent delivery, the marks shown in fig. 3 can be prevented from being displaced.

Further, in the stent 10 of the present embodiment, as the fixing members for fixing the intersecting portions of the wires, the fixing members 4a to 4j made of a material having rubber elasticity are used. As the fixing material having rubber elasticity, for example, a resin having shape memory properties such as silicon, a bioabsorbable resin, or the like may be used. Thus, the fixing material can deform the material when the stent is contracted, and the expandability of the stent is improved by the force that the stent is to be restored to its original shape by the rubber elasticity when the stent is expanded.

In particular, as shown in fig. 4, by fixing the crossing portions near the both ends of the stent 10 with the fixing materials 4a to 4j having rubber elasticity, it is possible to improve the expansion force of the both end portions of the stent, which may not obtain a sufficient expansion force only by the expansion force of the wire material.

Fig. 5 is a view schematically showing a state in which the intersecting portion of two wires is fixed using the fixing material 4 a. As shown in fig. 5, at the intersection portion of the wires 5a and 5b, the two wires are fixed by covering the two wires with the fixing material 4a in a state where the wires 5a and 5b are overlapped. Fig. 5 (a) is a front view of the intersection of the wires, and shows a case where two wires are fixed by the fixing member 4a at the intersection of the wires 5a and 5 b. Fig. 5 (B) is a cross-sectional view of the intersection of the wires, and shows a case where the two wires are covered with the fixing material 4a in a state where the wires 5a and 5B overlap each other.

According to the present embodiment described above, the following operational effects can be obtained.

(1) The plurality of wires are woven into a spiral stent, and the two crossed wires are fixed to the crossing portion of the wires by a fixing material having rubber elasticity. This prevents fraying at both ends of the holder. In addition, the wire can be prevented from being displaced in the catheter during stent delivery. Further, since the intersecting portions of the wires are fixed by the fixing material having rubber elasticity, the fixing material can deform the material when the stent is contracted, and the expansibility of the stent is improved by a force that is intended to restore the stent by the rubber elasticity when the stent is expanded.

(2) The crossing portions of the wires located near both ends of the stent are fixed by a fixing material. This can improve the expansion force of both end portions of the stent, which may not obtain a sufficient expansion force only by the expansion force of the wire material.

Modification example

The holder according to the above embodiment can also be modified as follows.

(1) In the above-described embodiment, as shown in fig. 4, an example in which the intersection portions located at the 2 nd row and the 3 rd row from the end of the stent 10 are fixed, and the intersection portions are fixed to the vicinities of both ends of the stent 10 as objects is described. However, the position of the crossing portion for fixing the wire rod is not limited to the vicinity of both ends as long as the object of the present invention can be achieved. For example, as shown in fig. 6 (a), the crossing portions of all the wires may be fixed by a fixing material. Alternatively, as shown in fig. 6 (B), the intersecting portions of the wires located near the both ends of the stent and the intersecting portions of the wires located in the central portion of the stent may be fixed by a fixing material. In the examples of fig. 6 (a) and 6 (B), since the crossing portions of the wires are fixed, frays at both ends of the stent and wire displacement in the catheter during stent delivery can be prevented, as in the above-described embodiment. In addition, since the wire members are fixed to the crossing portions near both ends of the stent, the expandability of both ends of the stent, which tends to be insufficient in expansion force, can be improved.

(2) In the above-described embodiment, as shown in fig. 5, an example in which two wires are fixed by covering the two wires with a fixing material in a state where the two wires are overlapped is described. However, the method of fixing the wire material with the fixing material is not limited to this. For example, as shown in fig. 7, only the front sides (outside of the stent) of the two wires may be fixed by a hemispherical fixing material 7c in a state where the wires 7a and 7b overlap each other at the intersection of the wires 7a and 7 b. Fig. 7 (a) is a front view of the intersection of the wires, and shows a case where two wires are fixed to the intersection of the wires 7a and 7b with a fixing member 7 c. Fig. 7 (B) is a cross-sectional view of the intersection of the wires, and shows a case where the wires 7a and 7B are overlapped and the outer sides, that is, the front sides of the two wires are fixed by a hemispherical fixing member 7 c.

Alternatively, as shown in fig. 8, two wires may be fixed by a fixing member 8c having an elongated shape along the lower wire 8b in a state where the wires 8a and 8b overlap each other at an intersection of the wires 8a and 8 b. Fig. 8 (a) is a front view of the intersection of the wires, and this figure shows a case where two wires are fixed to the intersection of the wires 8a and 8b by a fixing member 8c having an elongated shape along the wires 8 b. Fig. 8 (B) is a cross-sectional view of the intersection of the wires, and shows a case where the outer sides of the two wires are fixed by the fixing member 8c in a state where the wires 8a and 8B are overlapped.

Alternatively, as shown in fig. 9, two wires may be fixed by a cross-shaped fixing member 9c along the wires 9a and 9b in a state where the wires 9a and 9b overlap each other at an intersection of the wires 9a and 9 b. In either method, a material having rubber elasticity is used as the material for fixation, whereby the above object of the present invention can be achieved.

The present invention is not limited to the structure of the above-described embodiments as long as the characteristic functions of the present invention are not impaired. Further, a combination of the above-described embodiment and a plurality of modifications may be employed.

The disclosures of the following priority base applications are incorporated herein by reference.

Japanese patent application No. 127645 in 2019 (application 7/9/2019)

Description of reference numerals:

10 support

3a to 3f marks

4a to 4j, 7c, 8c, 9c fixing material

5a, 5b, 7a, 7b, 8a, 8b, 9a, 9b wire