KR101613279B1

KR101613279B1 - Double stent

Info

Publication number: KR101613279B1
Application number: KR1020150102602A
Authority: KR
Inventors: 김한기; 유현승; 서준혁; 박준규; 송석범; 진규현; 김태훈; 이덕희; 황선문; 김태일; 임옥균; 이가영
Original assignee: (주)시지바이오; 재단법인 아산사회복지재단
Priority date: 2015-07-20
Filing date: 2015-07-20
Publication date: 2016-04-18

Abstract

The double stent includes an outer stent in which a plurality of closed cells are arranged and an inner stent in which a plurality of open cells are arranged, and the inner stent may be disposed inside the outer stent.

Description

Double stent {Double stent}

The present disclosure relates to a double stent.

In general, cerebral vascular disease is a term that refers to a disease in which blood vessels supplying the brain are abnormally caused. It causes local neurological symptoms such as loss of consciousness due to abrupt cerebral blood flow disorder, hemiparesis, speech disorder, It is a disease that leads to death. Cerebral infarction, which is a high frequency of cerebrovascular disease, is a disease caused by a blood circulation disorder due to clotting of blood vessels due to deposition of a thrombus in a narrowed cerebral artery.

In order to treat such diseases, balloon catheter is inserted into the stenosed blood vessels to fix the stenosis to the stenosed region, and ballooning is performed to enlarge the stenosis by expanding the balloon. The methods have problems such as pain induction or restenosis caused by major surgery. In addition, cerebral vascular disease is more dangerous than other organs because of its physiological characteristics. Therefore, minimally invasive treatment methods are needed instead of direct surgery.

In order to overcome this problem, a method using a stent for treating a stenotic vessel and maintaining a normal flow of blood by inserting a stent formed of a stainless steel metal mesh into a stenosed vessel and enlarging it to an original vessel size .

These stents refer to implants in the form of a metal net used to normalize flow by insertion into a clogged area according to an interventional procedure technique without intervention of surgical operation, if obstruction of flow of blood or body fluids is obstructed.

Stent intervention, which is a minimally invasive procedure using a stent, is performed by inserting a small catheter (catheter) or thin wire (guidewire) through a blood vessel under X-ray fluoroscopy and approaching the affected part. And the blood flow is normalized.

In order for the stent to function stably during the procedure of the stent or after insertion into the body, it is required to have excellent flexibility and antihypertensive ability to withstand blood pressure in the blood vessel, and the area of contact with the blood vessel is small, And the ratio of voids is minimized.

The background technology of the present application is disclosed in Korean Patent Laid-Open Publication No. 10-1999-010304.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a stent in which an inner stent is inserted into an outer stent so as to overlay the outer stent and the inner stent.

The present invention also provides a self-expanding stand which is easy to be inserted into a blood vessel by an inner stent which is formed so as to be flexible and capable of self-contraction and expansion, and which can expand the diameter of a blood vessel after insertion.

In addition, the present invention provides a stand capable of satisfying both recapture and flexibility because it has a double structure including a stent made of a closed cell and a stent made of an open cell.

The present invention also provides a stent for preventing restenosis by supporting the cerebral blood vessels so that the cross-sectional area of the blood vessels is not contracted but maintained at a predetermined level or higher even when tensile force acts in the longitudinal direction of the stent.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a double stent comprising: an outer stent in which a plurality of closed cells are arranged; and an inner stent in which a plurality of open cells are arranged, And the inner stent may be disposed inside the outer stent.

According to an example of this embodiment, the inner stent can be overlaid against the inner surface of the outer stent.

According to one embodiment of the present invention, the inner stent is formed to have flexibility while being capable of self-contraction and expansion, and can be brought into contact with the outer stent through its own expansion.

According to an embodiment of the present invention, the outer stent may further include a first link portion connecting the closed cells, which are adjacent to each other in the circumferential direction, of the stent in the longitudinal direction of the plurality of closed cells.

According to one example of this embodiment, In the outer stent, the closed cell and the first link portion may be alternately arranged one by one in the longitudinal direction and the circumferential direction of the stent.

According to one example of this embodiment, In the inner stent, And a plurality of second link portions connecting the open cells neighboring in the circumferential direction of the stent among the plurality of open cells, the second link portions being alternately arranged one by one with two or more open cells adjacent to each other.

According to an embodiment of the present invention, the second link portion connects the open cells adjacent in the longitudinal direction of the stent, wherein the second link portions are arranged in the longitudinal direction of the stent from the positions arranged in the circumferential direction of the stent, And may alternately be arranged alternately with the open cells.

According to an embodiment of the present invention, the closed cell and the open cell have the same shape as the first wire and the first wire repeatedly formed in a zigzag form along the circumferential direction of the stent, And second wires arranged to be symmetrical with each other.

According to an embodiment of the present invention, the first wire and the second wire may be sequentially repeated in the longitudinal direction of the stent.

According to an example of this embodiment, the first wire and the second wire may have a shape in which a half-hexagonal mountain and a valley are repeated.

According to an embodiment of the present invention, the outer stent and the inner stent may have the same pattern.

According to an embodiment of the present invention, the outer stent and the inner stent may be connected so that the same chasers are mutually overlaid.

According to one example of this embodiment, one closed cell and open cell may be in the form of a hexagon extending in the longitudinal direction of the stent.

According to an embodiment of the present invention, the outer stent is entirely restrained with respect to the longitudinal direction and the circumferential direction of the stent, and the constraining force is the same, and the inner stent is formed such that each of the plurality of open cells extends in the longitudinal direction of the stent, It can be restrained only with respect to a part of the circumferential direction.

The above-described task solution is merely exemplary and should not be construed as limiting the present disclosure. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and the detailed description of the invention.

According to an embodiment of the present invention, an inner stent is inserted into an outer stent, thereby providing a stent in which an outer stent and an inner stent are in contact with each other to be overlaid.

In addition, the present invention can provide a self-expanding stand which is easy to insert into a blood vessel by an inner stent which is formed by itself to be flexible and capable of contraction and expansion, and which can expand the diameter of a blood vessel after insertion.

In addition, the present invention provides a stand capable of satisfying both recapture and flexibility since it has a double structure including a stent made of a closed cell and a stent made of an open cell.

In addition, the present invention can provide a stent capable of preventing the restenosis by supporting the cerebral blood vessels so that the cross-sectional area of the blood vessel is maintained at a predetermined level or more without contracting even if tensile force acts in the longitudinal direction of the stent.

Further, the effects obtainable here are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a view illustrating a double stent according to an embodiment of the present invention.
2 is a view illustrating an outer stent according to an embodiment of the present invention.
3 is a view of an inner stent according to one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view illustrating a double stent according to an embodiment of the present invention.

As shown in FIG. 1, the double stent 100 may have a cylindrical structure with both open ends in the longitudinal direction. The double stent 100 may have a structure in which the inner stent 20 is inserted into the outer stent 10 and the outer stent 10 and the inner stent 20 are overlapped with each other. That is, the double stent 100 may have a double structure in which the inner circumferential surface of the outer stent 10 and the outer circumferential surface of the inner stent 20 are overlapped with each other as the inner stent 20 is inserted into the outer stent 10 .

The outer stent 10 composed of a plurality of closed cells C and the inner stent 20 composed of a plurality of open cells O may have the same pattern. That is, the plurality of closed cells C and the plurality of open cells O may be formed in the same shape.

The closed cell C may be formed in a rhombic shape having four vertexes in the longitudinal direction and the circumferential direction of the stent and the open cell O may be formed in a rhombic shape having two vertexes in the longitudinal direction of the stent . For example, in the closed cell C, the longitudinal and circumferential directions of the stent are closed to form four vertexes, the open cell O is closed in the longitudinal direction of the stent, two vertexes are formed, Can be opened and connected to another neighboring open cell (O) in the circumferential direction of the stent. The concept of the closed cell C and the open cell O is obvious to a person skilled in the art of the stent, and thus a detailed description thereof will be omitted.

Hereinafter, the structure of the double stent 100 will be described in detail.

2 is a view illustrating an outer stent according to an embodiment of the present invention. The outer stent 10 may have a plurality of closed cells C arranged in the longitudinal direction and the circumferential direction of the stent 100, as shown in FIG.

The outer stent 10 may include a first link portion 3 connecting the closed cells C neighboring in the circumferential direction to the longitudinal direction of the stent 100 among the plurality of closed cells C .

In addition, the closed cell C and the first link portion 3 can be alternately arranged one by one in the longitudinal direction and the circumferential direction of the stent 100.

The outer stent 10 may have the same restraining force in the longitudinal direction of the stent 100 and the restraining force in the circumferential direction of the stent 100. More specifically, since the closed cells C and the first link portions 3 arranged in the longitudinal direction and the circumferential direction of the stent 100 are alternately arranged in a 1: 1 arrangement manner, the stent 100 ) May be the same in the longitudinal direction and the circumferential direction. That is, the outer stent 10 can be improved in recapturing function.

3 is a view of an inner stent according to one embodiment of the present invention.

The inner stent 20 is disposed inside the outer stent 10 and can be overlaid on the inner surface of the outer stent 10. Further, the inner stent 20 may be formed to have elasticity capable of self-contraction and expansion, and may be brought into contact with the outer stent 10 through its own expansion.

As shown in FIG. 3, the inner stent 20 may have a plurality of open cells O arranged in the longitudinal direction and the circumferential direction of the stent 100.

The inner stent 20 is connected to open cells 0 neighboring in the circumferential direction of the stent 100 among the plurality of open cells O and sequentially disposed alternately with two or more adjacent open cells O And may further include a plurality of second link portions 4.

Although the inner stent 20 according to one embodiment of the present invention is shown as being arranged such that one second link portion 4 is adjacent to every three open cells O, the number of open cells O is not limited .

The second link part 4 can connect the open cell 0 adjacent to the longitudinal direction of the stent 100. The second link part 4 alternately turns into two or more open cells 0 in the circumferential direction of the stent 100 Neighboring open cells O arranged in the same line can be connected in the longitudinal direction of the stent 100 from the arranged positions. In addition, the second link portion 4 can be alternately arranged one after another in sequence with the open cells O arranged in the circumferential direction of the stent 100.

The inner stent 20 may have a binding force in the longitudinal direction of the stent 100 and a binding force in the circumferential direction of the stent 100. More specifically, the open cells O arranged in the longitudinal direction of the stent 100 are alternately arranged one after the other in a 1: 1 arrangement manner with the first link portions 3, Since the open cells O arranged in the direction of the second link portion 4 are alternately arranged in a 3: 1 arrangement manner with the second link portion 4, the binding force in the circumferential direction and the longitudinal direction of the inner stent 20 can be different .

The outer stent 10 is entirely constrained to the longitudinal direction and the circumferential direction of the stent 100 and the inner stent 20 is formed such that each of the plurality of open cells O is in contact with the stent 100, Direction and the circumferential direction of the stent.

Accordingly, the inner stent 20 having such a structure can have a relatively higher flexibility than the outer stent 10. That is, the inner stent 20 can have an excellent effect on the flexibility and expansion force required for the stent.

The outer stent 10 and the inner stent 20 may be formed in the same pattern as shown in Figs. 2 to 3, and may be connected so that the same patterns are overlapped with each other.

When the double stent 100 including the outer stent 10 and the inner stent 20 is inserted into the blood vessel, the inner stent 20 is easily inserted in a contracted state, and after the insertion, the inner stent 20 20 are self-inflated and come into contact with the outer stent 10, thereby enlarging the diameter of the blood vessel.

The closed cell C and the open cell O are formed in the same shape as the first wire 1 and the first wire 1 repeatedly formed in a zigzag form along the circumferential direction of the stent 100 , And a second wire (2) arranged to be mutually symmetrical with the first wire (1).

At this time, the first wire 1 and the second wire 2 may be formed to be sequentially repeated in the longitudinal direction of the stent 100. That is, the closed cell C and the open cell O arranged in the circumferential direction of the stent 100 can be formed by the first wire 1 and the second wire 2 facing each other.

The first wire 1 and the second wire 2 may have a shape in which a half-hexagonal mountain and a valley are repeated. Therefore, one closed cell C and the open cell O may be formed in a hexagonal shape extending in the longitudinal direction of the stent 100.

The double stent 100 according to an embodiment of the present invention has a double structure including an outer stent 10 made of a closed cell C and an inner stent 20 made of an open cell O, It is an optimized stand that can meet both recaprue and flexibility at the same time.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed in a similar fashion may also be implemented.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: double stent
1: first wire
2: second wire
3: first link portion
4: second link portion
10: Outer stent
20: inner stent

Claims

A stent having a cylindrical structure with both open ends in the longitudinal direction,
An outer stent in which a plurality of closed cells are arranged; And
And an inner stent in which a plurality of open cells are arranged,
Wherein the inner stent is disposed inside the outer stent,
Wherein the open cell includes a first wire repeatedly formed in a zigzag shape along the circumferential direction of the stent and a second wire formed in the same shape as the first wire and arranged to be symmetrical with respect to the first wire,
Wherein the first wire and the second wire are formed so as to be sequentially repeated in the longitudinal direction of the stent,
Wherein the inner stent includes a plurality of second link portions connecting the open cells neighboring in the circumferential direction of the stent among the plurality of open cells and alternately arranged in turn with two or more open cells adjacent to each other,
Wherein the second link portion connects neighboring open cells in the longitudinal direction of the stent and is alternately arranged one by one with the open cells.

The method according to claim 1,
Wherein the inner stent abuts the inner surface of the outer stent and is overlaid.

3. The method of claim 2,
Wherein the inner stent is configured to be flexible and capable of self-contraction and expansion, and is brought into contact with the outer stent through its own expansion.

The method according to claim 1,
Wherein the outer stent comprises:
Further comprising a first link portion connecting each of the closed cells adjacent to the longitudinal direction of the stent in a circumferential direction, out of the plurality of closed cells.

5. The method of claim 4,
Wherein the closed cell and the first link portion are alternately arranged one after another in the longitudinal direction and the circumferential direction of the stent.

delete

The method according to claim 1,
Wherein the first wire and the second wire are electrically connected to each other,
A double stent is a shape in which a half hexagonal mountain and bone are repeated.

The method according to claim 1,
The outer stent and the inner stent may be formed,
A double stent with the same pattern.

11. The method of claim 10,
Wherein the outer stent and the inner stent are connected such that the same patterns are overlaid one on top of the other.

The method according to claim 1,
One closed cell and an open cell,
Wherein the stent is a hexagonal shape extending in the longitudinal direction of the stent.

The method according to claim 1,
Wherein the outer stent comprises:
The plurality of closed cells are all constrained to the longitudinal direction of the stent and the circumferential direction of the stent,
In the inner stent,
Wherein each of the plurality of open cells is confined to only a portion of the length of the stent and the circumferential direction of the stent.