CN109350316B - A kind of vascular stent monomer and vascular stent - Google Patents

Abstract

A vascular stent monomer and a vascular stent relate to the technical field of medical appliances. The utility model provides a vascular stent monomer, includes a bottom surface, b bottom surface and edge, a bottom surface and b bottom surface are parallel to each other, a bottom surface and b bottom surface are polygon and constitute by polygon each limit, the projection of a bottom surface on b bottom surface is contained in b bottom surface, the summit on the a bottom surface passes through the similar summit on edge connection b bottom surface, every summit on a bottom surface and the b bottom surface has and only an edge is connected with it, the edge includes Y shape edge. The vascular stent is formed by connecting a plurality of vascular stent monomers, except for two vascular stent monomers which are respectively positioned at the head and the tail of the vascular stent, the a bottom surface of any vascular stent monomer is connected with the a bottom surface of the other vascular stent monomer, and the b bottom surface of any vascular stent monomer is also connected with the b bottom surface of the other vascular stent monomer.

Description

A kind of vascular stent monomer and vascular stent

Technical field

The present invention relates to the technical field of medical devices, and in particular to a vascular stent monomer and a vascular stent.

Background technique

In vascular stent surgery, an internal stent is placed in the diseased segment to support the narrowed and occluded segment of the blood vessel, reduce elastic recoil and reshaping of the blood vessel, and maintain smooth blood flow in the lumen. Among the existing technical solutions, early metal stents have achieved remarkable results after being used in clinical treatments, but they can easily lead to thrombosis, have a high restenosis rate, and cause damage to the blood vessel wall. The newly developed covered stents and biomaterial stents are degradable materials, and their mechanical properties such as stiffness are obviously insufficient, which will cause the degradable stent to be implanted in a narrow blood vessel and cause the blood vessel to collapse again due to insufficient support performance during its dynamic service. Zoom out. When most stents are expanded, the support body deforms along the circumferential direction, shortening the axial dimension of the stent, and the axial shortening rate is high. In addition, existing vascular stents cannot reduce the pressure on the blood vessel wall when blood flows.

Contents of the invention

The purpose of the present invention is to avoid the problems of insufficient mechanical properties of blood vessel stents in the prior art and the inability to reduce the pressure on the blood vessel wall during blood flow, and to provide a blood vessel stent monomer and a blood vessel stent to achieve stable support for blood vessels. Reduce the re-narrowing rate of blood vessels and reduce the pressure on the blood vessel wall during blood flow.

The object of the present invention is achieved through the following technical solutions:

A vascular stent monomer, which includes a bottom surface, a bottom surface b and an edge. The bottom surface a and the bottom surface b are parallel to each other. Both the bottom surface a and the bottom surface b are polygons and are formed by each side of the polygon. Composition, the projection of the bottom surface a on the bottom surface b is included in the bottom surface b, the vertices on the bottom surface a are connected to the adjacent vertices on the bottom surface b through the edges, the bottom surface a and the bottom surface b are Each vertex on the bottom surface of b has and has only one edge connected thereto, and the edge includes a Y-shaped edge.

Preferably, the bottom surface a and the bottom surface b are irregular polygons with different numbers of sides, or the bottom surface a and the bottom surface b are regular polygons with different numbers of sides.

Preferably, one of the bottom surface a and the bottom surface b is a regular polygon, and the other is an irregular polygon.

Preferably, one of the bottom surface a and the bottom surface b is a pentagon and the other is a hexagon, and the edges include a Y-shaped edge and four straight edges.

Preferably, the bottom surface a is a regular pentagon, and the bottom surface b is a hexagon and is not a regular hexagon.

Preferably, each edge of the bottom surface a and the bottom surface b is a cylinder, the edges are all cylinders, the edges are straight edges or arc edges, and the edges include at least 2 of them. Describe the Y-shaped edge.

Preferably, the projection of the geometric center of the bottom surface a on the bottom surface b coincides with the geometric center of the bottom surface b, and the area of the bottom surface a is not less than half of the area of the bottom surface b.

A vascular stent, which is formed by connecting several of the above-mentioned vascular stent monomers. Except for the two vascular stent monomers located at the head and tail of the vascular stent, the bottom surface a of any vascular stent monomer is The bottom surface a of another vascular stent unit is joined to the bottom surface b of any vascular stent unit. The bottom surface b of any vascular stent unit is also joined to the bottom surface b of another vascular stent unit.

Preferably, the vascular stent is a stent made of amorphous material, its outer surface is covered with a polymer film, and its surface is coated with a drug coating to reduce the risk of thrombosis and neointimal hyperplasia.

Preferably, the vascular stent is a stent made of zirconium-based amorphous material.

Beneficial effects of the present invention:

The structure of this vascular stent alone meets the mechanical conditions required to support the blood vessel wall. Its structure can still maintain sufficient structural stability when the stent is squeezed by the blood vessel wall. The Y-shaped edge is the main stabilizing force of the stent when it is deformed. The structure of action.

In addition, according to the fluid continuity equation and Bernoulli's equation, during the process of blood flowing through the vascular stent, the flow rate of the blood will increase at the location where the local radius of the vascular stent becomes smaller, so the pressure of the blood on the blood vessel wall will increase as the local radius of the vascular stent becomes smaller. of decline. This Bernoulli effect will be more obvious when the adaptive growth of the blood vessel wall adheres to the outer surface of the vascular stent, or when thrombus forms on the outside of the vascular stent. In the vascular stent, the effect of the continuous vascular stent monomer is beneficial to reducing the pressure on the blood vessel wall during blood flow, which can reduce the risk of aneurysm growth and rupture.

The present invention avoids the problems of insufficient mechanical properties of blood vessel stents in the prior art and the inability to reduce the pressure on the blood vessel wall during blood flow. It proposes a blood vessel stent monomer and a blood vessel stent to achieve stable support for blood vessels and reduce blood vessel wall stress. The rate of re-narrowing and reducing the pressure on the vessel wall as blood flows reduces the risk of the aneurysm growing and rupturing.

Description of the drawings

The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. For those of ordinary skill in the art, without exerting creative efforts, other embodiments can be obtained based on the following drawings. Picture attached.

Figure 1 is a schematic structural diagram of a vascular stent of the present invention.

Figure 2 is a schematic structural diagram of a single vascular stent of the present invention.

The figure includes: edge 1, vascular stent unit 2, b bottom surface 3, a bottom surface 4, Y-shaped edge 5, and vascular stent 6.

Detailed ways

The present invention will be further described in conjunction with the following examples.

As shown in Figures 1 to 2, a vascular stent unit 2 in this embodiment includes a bottom surface 4, a bottom surface 3 and an edge 1. The bottom surface a 4 and the bottom surface b 3 are parallel to each other, so Both the bottom surface a 4 and the bottom surface b 3 are polygons and are composed of each side of the polygon. The projection of the bottom surface a 4 on the bottom surface b 3 is included in the bottom surface b 3 . The bottom surface a The vertices on 4 are connected to the adjacent vertices on the bottom surface b 3 through the edge 1. Each vertex on the bottom surface a 4 and the bottom surface b 3 has one and only one edge 1 connected to it, The edge 1 includes a Y-shaped edge 5 .

The structure of the vascular stent monomer 2 meets the mechanical conditions required to support the blood vessel wall, and its structure can maintain sufficient structural stability when the stent is subjected to the extrusion force of the blood vessel wall. The Y-shaped edge 5 is the stent's function when deformed. Mainly stabilizing structure.

Preferably, the bottom surface a 4 is a regular pentagon, the bottom surface b 3 is a hexagon and is not a regular hexagon, and the edge 1 includes a Y-shaped edge 5 and four arc edges 1 . This structure is conducive to forming better structural stability of the vascular stent monomer 2 .

Preferably, each side of the bottom surface a 4 and the bottom surface b 3 is a cylinder, and the edges 1 are all cylinders. Such a shape is beneficial to avoid damage to the blood vessel wall caused by the vascular stent unit 2 . The edge 1 is an arc edge to meet certain special shape and angle requirements. The edge 1 includes at least two Y-shaped edges 5 to facilitate the formation of better structural stability of the vascular stent monomer 2 .

Preferably, the projection of the geometric center of the bottom surface a 4 on the bottom surface b 3 coincides with the geometric center of the bottom surface b 3 , and the area of the bottom surface a 4 is not less than half of the area of the bottom surface b 3 . First, the vascular stent monomer 2 forms a structure that is more conducive to supporting blood vessels.

This embodiment also includes a vascular stent 6, which is composed of several of the above-mentioned vascular stent monomers 2. Except for the two vascular stent monomers 2 respectively located at the head and tail of the vascular stent 6, any blood vessel stent 6 The a bottom surface 4 of the stent unit 2 is connected to the a bottom surface 4 of another vascular stent unit 2, and the b bottom surface 3 of any vascular stent unit 2 is also connected to the a bottom surface 4 of another vascular stent unit 2. The b bottom surface 3 is joined.

According to the fluid continuity equation and Bernoulli's equation, during the process of blood flowing through the vascular stent 6, the flow rate of the blood will increase at the location where the local radius of the vascular stent monomer 2 becomes smaller, so the pressure of the blood on the blood vessel wall increases as the local radius of the vascular stent 2 becomes smaller. of decline. This Bernoulli effect will be more obvious when the blood vessel wall grows adaptively and adheres to the outer surface of the blood vessel stent 6 , or when thrombus forms on the outside of the blood vessel stent 6 . In the vascular stent 6, the continuous vascular stent monomer 2 has the effect of reducing the pressure on the blood vessel wall during blood flow, and can reduce the risk of aneurysm enlargement and rupture.

Preferably, the vascular stent is coated with a polymer film for carrying drugs, and the surface is coated with a drug coating to reduce the risk of thrombosis and neointimal hyperplasia after stent implantation.

Preferably, the vascular stent is a stent made of zirconium-based amorphous material. Zirconium-based amorphous alloy materials have high tensile strength, high elastic energy, high impact fracture performance, high corrosion resistance, good ductility, excellent inherent low-frequency vibration damping performance, high electrocatalytic activity, and high It has good bioaffinity, good magnetic properties after adding iron, and good stability during dynamic service in the complex internal environment of blood vessels. The vascular stent 6 made of zirconium-based amorphous alloy material is beneficial to avoid thrombosis, high restenosis rate and damage to the blood vessel wall, and solves the problem of shortening of the stent's axial dimension and high axial shortening rate when the stent is expanded. The problem.

This embodiment avoids the problems of insufficient mechanical properties of blood vessel stents in the prior art and the inability to reduce the pressure on the blood vessel wall during blood flow. It proposes a blood vessel stent monomer and a blood vessel stent to achieve stable support for blood vessels and reduce the pressure on the blood vessel wall. The rate of re-narrowing of blood vessels and reducing the pressure on the vessel wall as blood flows reduces the risk of aneurysm growth and rupture.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art will understand that , the technical solution of the present invention may be modified or equivalently substituted without departing from the essence and scope of the technical solution of the present invention.

Claims (6)

1. A vascular stent monomer, characterized in that: it includes a bottom surface, a bottom surface b and an edge, the bottom surface a and the bottom surface b are parallel to each other, the bottom surface a and the bottom surface b are both polygonal and formed by It is composed of each side of the polygon, the projection of the base a on the base b is included in the base b, and the vertices on the base a are connected to the adjacent vertices on the base b through the edges, so Each vertex of the bottom surface a and the bottom surface b has one and only one edge connected thereto, and the edge includes a Y-shaped edge; the bottom surface a and the bottom surface b are irregular and have different edges. number of polygons, or the base a and the base b are regular polygons with different numbers of sides; the projection of the geometric center of the base a on the base b coincides with the geometric center of the base b, and the base a The area of the bottom surface is not less than half of the area of the bottom surface of b; the vascular stent is a stent made of zirconium-based amorphous material, its outer surface is covered with a polymer film, and its surface is coated with a drug coating. 2. A vascular stent monomer according to claim 1, characterized in that: one of the bottom surface a and the bottom surface b is a regular polygon, and the other is an irregular polygon. 3. A vascular stent monomer according to claim 1, characterized in that: one of the bottom surface a and the bottom surface b is a pentagon, and the other is a hexagon, and the edge includes a Y shaped edges and four straight edges. 4. A vascular stent monomer according to claim 3, characterized in that: the bottom surface a is a regular pentagon, and the bottom surface b is a hexagon and is not a regular hexagon. 5. A vascular stent monomer according to claim 1, characterized in that: each side of the bottom surface a and the bottom surface b is a cylinder, the edges are both cylinders, and the edges are Straight edges or arc edges, the edges include at least 2 of the Y-shaped edges. 6. A vascular stent, characterized in that: it is formed by connecting several vascular stent monomers according to any one of claims 1 to 5, except for the two vascular stent monomers respectively located at the head and tail of the vascular stent. In addition, the bottom surface a of any single vascular stent is joined to the bottom surface a of another single vascular stent, and the bottom surface b of any single vascular stent is also connected to the bottom surface b of another single vascular stent. b Bottom surface joint.