WO2017067396A1

WO2017067396A1 - Vascular stent

Info

Publication number: WO2017067396A1
Application number: PCT/CN2016/101708
Authority: WO
Inventors: 李雷
Original assignee: 李雷
Priority date: 2015-10-23
Filing date: 2016-10-10
Publication date: 2017-04-27
Also published as: CN205144805U

Abstract

Provided is a vascular stent, comprising a stent body (1) formed as a tubular structure; the stent body (1) comprises multiple loops of ringed wire (2) arranged in the axial direction; said ringed wires (2) form a ring-shaped structure in the circumferential direction around said stent body (1); an open area (4) and closed areas (5) are formed on the side wall of the tubular structure of said stent body (1); the stent body (1) also comprises connecting wires (3) located in the closed areas (5); said connecting wires (3) are used for connecting adjacent ringed wires (2) located in the closed areas (5); the open area (4) is located on one side of the stent body (1) and is surrounded by the closed areas (5). Thus the open area (4) not provided with connecting wire allows said area to accommodate the inflection point of the bending section of a blood vessel; the structure of the stent has little deformation and a long service life; furthermore, the structure provides good support stability and usefulness to the stent by means of the closed areas (5) surrounding the open area (4).

Description

Stent

Technical field

The present disclosure relates to the field of medical vascular stents, and in particular to a vascular stent.

Background technique

With the advent of an aging society, the use of vascular stents for radial support for vascular occlusion is increasing. Among them, depending on the location of the implant and the type of treatment, the type, structure and implantation method of the vascular stent are also different. At present, widely used stents include bare stents, coated stents, and stent grafts. The stent deployment can be divided into a ball expansion method and a self-expansion method. Structurally, taking a common bare stent as an example, the blood vessel stent is generally straight and is usually cut into a wire structure by metal to have a stable support structure. Among them, the prior art brackets are evenly arranged at various positions of the straight cylindrical structure to facilitate manufacturing. However, due to the diversity of human blood vessels, if the stent is implanted in the main vessel of the branch vessel, the blood flow between the main vessel and the branch vessel will be poor, and the blood vessel will be bent more. Straight-tube blood vessels require a large deformation of their own to conform to the vessel wall of the bent portion, resulting in a lower life span of the stent, which would otherwise cause endoleaks and thrombosis in the region.

Summary of the invention

It is an object of the present disclosure to provide a blood vessel stent that is more adaptable while ensuring structural stability.

In order to achieve the above object, the present disclosure provides a blood vessel stent comprising a stent body formed into a tubular structure, the stent body comprising a plurality of annular loop wires arranged in an axial direction, each of the annular loop wires being respectively formed into a corrugated structure. The bracket body further includes a connecting line connecting the adjacent two loops of the loop wire to form a closed area by the two adjacent connecting lines and the adjacent two loops of the loop wire, the cylindrical structure side of the bracket body The wall consists of an open area and a closed area, with complete peaks and/or waves on the contour The closed area having more than two valleys is the open area, and the closed area in which no more than two complete peaks and/or troughs are on the contour line is the closed area, wherein the open area The zones are a plurality of or axially adjacent ones, the one or more open zones being located on and surrounded by a circumferential side of the stent body.

Preferably, the peaks of adjacent annular filaments are axially aligned between the peaks and the valleys, and the connecting lines are connected between peaks or troughs of adjacent annular filaments.

Preferably, the axially adjacent connecting lines are staggered in the circumferential direction.

Preferably, the circumferential dimension of the plurality of axially adjacent open zones gradually decreases from the central direction toward both sides in the axial direction.

Preferably, the ratio of the area of the open area to the area of the closed area is 1:5 to 1:10.

Preferably, the open area corresponds to a bent portion of a branch vessel or blood vessel to be implanted into a blood vessel.

Preferably, the open area has a circumferential dimension that occupies 1/5-1/2 of the entire circumference.

According to the above technical solution, the open area can correspond to the branch blood vessel of the blood vessel to reduce the blood flow influence on the branch blood vessel and can make the area cope with the inflection point of the blood vessel bending portion, and the deformation of the structure of the stent itself is small and the life is high. At the same time, since the open area is only disposed on one side of the axial direction and surrounded by the closed area, the support stability of the bracket can be provided through the closed area of a larger area, and the utility is strong.

Other features and advantages of the present disclosure will be described in detail in the detailed description which follows.

DRAWINGS

The drawings are intended to provide a further understanding of the disclosure, and are in the In the drawing:

1 is a schematic structural view of a blood vessel stent provided by a preferred embodiment of the present disclosure.

Description of the reference numerals

1 bracket body 2 ring wire

3 connection line 4 open area

5 enclosed area

detailed description

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are not to be construed

In the present disclosure, the term "inside and outside" as used herein refers to the inside and outside of the contour of the corresponding component, unless otherwise stated.

As shown in FIG. 1 , the present disclosure provides a blood vessel stent comprising a stent body 1 formed in a cylindrical structure, the stent body 1 including a plurality of annular loop wires 2 arranged in an axial direction, and each loop of the loop wires 2 are respectively formed. It is a corrugated structure for easy compression or unfolding. The bracket body 1 further includes a connecting line 3 connecting the adjacent two loops of the loop wire 2 to form a closed region by the adjacent two connecting wires 3 and the adjacent two looped loop wires 2, thereby realizing a stable supporting structure of the bracket body. The blood vessel stent can be used as a stent skeleton of a bare stent or a stent graft, and can be made of materials such as metal tantalum, medical stainless steel, and nickel titanium alloy. For the purposes of the present disclosure, the tubular structural side wall of the stent body 1 is comprised of an open area 4 and an enclosed area 5, wherein the number of complete peaks and/or troughs on the contour line is more than two closed areas being open areas 4. The closed area of no more than two complete peaks and/or troughs on the contour line is closed area 5, wherein the number of peaks and/or troughs should be understood as: when there is only one of the peaks and troughs, The number is the number of peaks or troughs; when there are peaks and troughs, the number should be the sum of the number of peaks and troughs. That is, there are at most two peaks or two troughs, or one peak and one trough on the contour line of the closed area 5, otherwise the closed area is the open area 4. Therefore, it can be seen that the formation of the open area 4 and the closed area 5 is related to the tightness of the arrangement of the connecting line 3, and the circumferential dimension of the open area 4 is large so that the branching blood vessels of the blood vessel can reduce the degree of branching blood vessels. The influence of blood flow, and because the open area 4 is not large, the size of the connecting line 3 can make the area bend easily with the bending of the blood vessel, so that the large deformation of the blood vessel stent itself is not required, and the life of the stent itself is high. .

And in order to achieve this, the open area 4 may be a plurality of one or more axially adjacent ones, the one or more open areas 4 being located on the circumferential side of the stent body 1 and surrounded by the closed area 5. That is, the one open area 4 or a plurality of adjacent open areas 4 are not located at the end of the stent body 1, but are surrounded by the closed area 5, so that the open area 4 can correspond to the bent portion of the branch blood vessel or blood vessel. And since the total area of the closed area 5 is larger than the total area of the open area 4, the stable support structure of the whole blood vessel support is ensured. Among them, the open area 4 circumferential dimension can account for 1/5-1/2 of the overall circumference. To cope with branching blood vessels or bends. If the circumferential dimension of the open area 4 is too large, the structure of the stent body 1 is unstable, and if it is too small, the response to the branch blood vessel or the bent portion cannot be achieved.

It should be noted that there are various implementation manners of the foregoing technical solutions, such as the connection line 3, the arrangement of the annular wire, and the like. For the convenience of the present disclosure, only the preferred embodiments thereof will be described herein. It is intended to illustrate the disclosure and is not intended to limit the disclosure. The connection meaning of the connecting wire 3 is not limited to the connection of the connecting wire 3 to the ring-shaped wire 2 bracket by the connecting means, but the use of connecting the loop-shaped wire 2. It can be integrally formed by the laser cutting and the annular wire 2 .

In a preferred embodiment of the present disclosure, in order to make the structure more stable and reasonable, that is, the structural rules of the closed area 5 and the open area 4, preferably, the peaks of the adjacent annular wires 2 and the valleys are respectively axially aligned, and connected. The wires 3 are connected between the peaks or valleys of the adjacent annular wires 2, that is, the connecting wires 3 extend in the axial direction and are parallel to each other. Thus, the closed area 5 formed is a regular shape as shown in FIG. In order to make the overall stent body 1 more stable. More preferably, the axially adjacent connecting lines 3 are staggered in the circumferential direction. That is, the connecting wires 3 on both sides of one annular wire 2 are used to connect the crests and troughs of the annular wire, respectively. Thereby, most of the region of the stent body 1 composed of the closed region is structurally stable. In other embodiments, the connecting line 3 can also be connected between a peak and a trough. Such deformations are also intended to fall within the scope of the present disclosure.

In addition, in order to minimize the influence of the open area 4 on the structural stability of the integral bracket body 1, for example, when the bracket body 1 is bent, the overall structure is not affected. Preferably, as shown in FIG. 1, the open area 4 is adjacent. At this time, the circumferential dimension of the open area 4 gradually decreases from the center direction toward both sides in the axial direction, that is, the influence of the open area 4 on the structure of the closed area 5 gradually becomes smaller. In other words, the open area 4 having the largest circumferential dimension is located at the axial center position of the area occupied by all the open areas 4. The circumferential dimension of the open zone 4 referred to herein is related to the number of circumferentially arranged connecting lines 3 which should be provided as a closed zone in this zone, that is, the more the connecting wires 3 which should be provided, the week of the zone The larger the size. In this embodiment, five connection lines should be set in the maximum size of the center, and four connection lines should be set on the adjacent areas on both sides. In other implementations, the setting should be continued. 2, 1 area of the connecting line 3 to further play a role of transition.

Further, in a preferred embodiment of the present disclosure, the ratio of the area of the open area 4 to the area of the closed area 5 is 1:5 to 1:10. In order to maximize the effect of the open area 4, the structural stability of the stent body 1 is ensured.

In summary, the blood vessel stent provided by the present disclosure makes the adaptability of the blood vessel stronger by the ingenious setting of the open area 4, and does not affect the structural stability of the stent body 1, and has high practicability and popularization value.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the scope of the technical idea of the present disclosure. These simple variations are all within the scope of the disclosure.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure is applicable to various possibilities. The combination method will not be described separately.

In addition, any combination of various embodiments of the present disclosure may be made as long as it does not deviate from the idea of the present disclosure, and should also be regarded as the disclosure of the present disclosure.

Claims

A blood vessel stent comprising a stent body (1) formed into a cylindrical structure, the stent body (1) comprising a plurality of annular loop wires (2) arranged in an axial direction, each annular loop wire (2) being formed as a corrugated structure, the bracket body (1) further comprising a connecting line (3) connecting adjacent two loops of the annular wire (2) to be adjacent to the two connecting wires (3) and the adjacent two turns The annular wire (2) forms a closed region, characterized in that the tubular structure side wall of the bracket body (1) is composed of an open area (4) and a closed area (5), wherein the complete peaks and/or contour lines and/or Or the closed area of the number of troughs more than two is the open area (4), and the closed area of the complete number of peaks and/or troughs of no more than two on the contour line is the closed area ( 5) wherein the open area (4) is a plurality or axially adjacently arranged, the one or more open areas (4) being located on a circumferential side of the stent body (1) and by the The enclosed area (5) is surrounded.
The blood vessel stent according to claim 1, characterized in that the peaks adjacent to the annular wire (2) are axially aligned between the peaks and the valleys, respectively, and the connecting wires (3) are connected adjacent to each other. Between the peaks of the ring-shaped wire (2) or between the valleys.
A blood vessel stent according to claim 2, characterized in that the axially adjacent connecting lines (3) are staggered in the circumferential direction.
The blood vessel stent according to claim 1, characterized in that the circumferential dimension of the plurality of axially adjacent open regions (4) gradually decreases from the central direction toward both sides in the axial direction.
The blood vessel stent according to claim 1, characterized in that the ratio of the area of the open area (4) to the area of the closed area (5) is 1:5 to 1:10.
A blood vessel stent according to claim 1, characterized in that the open area (4) corresponds to a bent portion of a branch vessel or blood vessel to be implanted into a blood vessel.
The blood vessel stent according to claim 1, wherein the open area (4) has a circumferential dimension of 1/5 to 1/2 of the entire circumference.