CN201959034U - Blood vessel bracket - Google Patents

Abstract

The application discloses a vascular stent, which includes a stent body, wherein: the stent body is a network tubular structure composed of multiple rows of interlaced parallelogram-shaped cells, and in two adjacent rows of cells, wherein The long sides of the cells in one column are parallel to the short sides of the touching cells in the other column, and the short sides are parallel to the long sides of the touching cells in the other column. In the vascular stent provided by the embodiment of the present application, when the main body of the stent with a network tubular structure is deformed and bent by an external force, each unit cell can rotate around its center of symmetry, so that the stress concentration during the deformation process of the vascular stent is reduced, and the mesh can be The stretching or extrusion of the main body of the tubular structure stent plays the role of buffering and protection, and maintains the shape of the network tubular structure. Therefore, the vascular stent has sufficient supporting strength in the radial direction and good flexibility in the axial direction.

Description

a vascular stent

technical field

The present application relates to the field of medical devices, in particular to a vascular stent.

Background technique

With the improvement of people's living standards and changes in lifestyle, the incidence of cardiovascular and cerebrovascular diseases is increasing. Coronary heart disease caused by cardiovascular stenosis has become one of the main diseases that endanger human life. Interventional therapy has become the main method for the treatment of cardiovascular stenosis due to its small trauma and good effect. Interventional treatment refers to the implantation of internal stents in the lesioned segment of the vessel on the basis of balloon expansion and shaping. The implanted internal stent can support the stenotic and occluded segment of the vessel, reduce the elastic retraction and reshaping of the vessel, and maintain the blood pressure in the vascular cavity. The flow is smooth, and some internal stents can also prevent restenosis.

From the perspective of clinical use, an ideal vascular stent implanted in the human body needs to meet the following technical indicators at the same time: sufficient support in the radial direction, and a small radial rebound rate, good flexibility in the axial direction, And small axial retraction rate, in addition, it also needs to have appropriate metal coverage and so on. At present, the existing vascular stents can be divided into two types: self-elastic stents and balloon-expandable stents according to their deployment methods.

Through research on the prior art, the applicant found that among the two existing vascular stents, the self-elastic stent itself has high elasticity and can self-expand in the blood vessel without relying on a balloon; while the balloon-expandable stent itself is inelastic, It must be attached to the inner wall of the blood vessel by expanding the balloon to a certain diameter. Due to material and structural limitations, it is difficult for the two existing vascular stents to be effectively unified in terms of radial support strength and axial flexibility. For example, although the self-elastic stent has strong radial support strength, its axial flexibility is not good, and the metal coverage and axial shortening rate are relatively large; while the balloon expandable stent has better axial flexibility. , but the radial support force is insufficient, and the metal coverage is too small, which is likely to cause vascular restenosis.

Therefore, the existing vascular stents cannot meet the clinical needs, and there is an urgent need for a vascular stent with both strong radial support and good axial flexibility.

Utility model content

In view of this, an embodiment of the present application provides a vascular stent, the stent body of which is a network tubular structure composed of multiple rows of interlaced parallelogram cells, so as to achieve sufficient support strength in the radial direction, and in the axial direction Has good flexibility.

In order to achieve the above purpose, the technical solutions provided by the embodiments of the present application are as follows:

A vascular stent, comprising a stent body, wherein: the stent body is a network tubular structure composed of multiple rows of interlaced parallelogram-shaped cells, and in two adjacent rows of cells, the cells in one row The long side of the cell is parallel to the short side of the touching cell in the other column, and the short side is parallel to the long side of the touching cell in the other column.

Preferably, the centers of the cells in each column of cells are on a straight line.

Preferably, in the two adjacent columns of cells, the cells in one column share the same edge as the contacting cells in the other column.

Preferably, the obtuse angle of each cell in the plurality of rows of cells is the same, and the obtuse angle is 95-175 degrees.

It can be seen from the above technical solutions that the vascular stent provided by the embodiment of the present application includes a stent body with a network tubular structure, and the grid on the network tubular structure is composed of multiple rows of interlaced cells in the shape of a parallelogram. In two columns of cells, the long side of the cell in one column is on a straight line with the short side of the contacting cell in the other column, and the short side is on a straight line with the long side of the contacting cell in the other column. Since each unit cell of the vascular stent has a centrosymmetric structure, when the stent body of the network tubular structure is deformed and bent by an external force, each unit cell can rotate around its center of symmetry, so that the stress concentration during the deformation process of the vascular stent is reduced. Small, it can buffer and protect the stretching or extrusion of the main body of the network tubular structure support, and maintain the shape of the network tubular structure. Therefore, the vascular stent has sufficient supporting strength in the radial direction, can support the narrowed blood vessels at the lesion, and has good flexibility in the axial direction, and can realize uniform bending.

At the same time, the stent body of the vascular stent is composed of multiple rows of parallelogram cells, so that the vascular stent can be radially compressed into a delivery system with a small diameter during surgery, increasing the flexibility and scope of application of the delivery system .

In addition, the multiple rows of interlaced cells on the main body of the stent make the vascular stent have sufficient metal coverage, not only during implantation, but also when the vascular stent passes through a curved blood vessel, the surface of the vascular stent avoids the appearance of "skin" corners. It can reduce the damage to the blood vessel wall, and after implantation in the human body, it can also effectively cover the vascular lesion.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in this application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the deployed structure of the vascular stent provided by the embodiment of the present application;

FIG. 2 is a schematic structural view of the first unit cell of the vascular stent provided in the embodiment of the present application;

Fig. 3 is a schematic structural diagram of the second unit cell of the vascular stent provided by the embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

FIG. 1 is a schematic diagram of a deployed structure of a vascular stent provided in an embodiment of the present application.

As shown in Figure 1, the vascular stent includes a stent body 1 with a network tubular structure. The grid on the stent body 1 is composed of multiple columns of cells. As shown in Figure 1, the multiple columns of cells are alternately composed of columns 11 and 12. Composition, and the cells in column 11 and column 12 are interleaved.

The shapes of the cells on column 11 and column 12 are both parallelograms, the shapes of the cells in each column are the same, and the centers of the cells in the same column are on a straight line. Column 11 is composed of a plurality of first cells 2, and column 12 is composed of a plurality of second cells 3. Referring to Figure 1, as shown in Figure 2 and Figure 3, the first cell 2 and the second cell 3 are both Parallelogram. Due to the instability of the parallelogram, the stent main body 1 can be expanded and contracted in the axial direction, and has good flexibility.

As shown in Figure 1, the first cell 2 in the column 11 is in contact with two cells in the column 12, respectively the second cell 31 and the second cell 32, wherein: the first cell 2 The long side is parallel to the short side of the second cell 31, and the short side of the first cell 2 is parallel to the long side of the second cell 31; the short side of the first cell 2 is also parallel to the second cell 32. The long sides are parallel, the long side of the first cell 2 is also parallel to the short side of the second cell 32, and the first cell 2 and the second cell 31, the first cell 2 and the second cell 32 The positions in contact are all co-edge, as shown in Figure 1, that is, the short side of the first cell 2 shares the same side with the long side of the second cell 31, and the long side of the first cell 2 and the second cell 32 The shorter side of the same side. In the embodiment of the present application, the positional relationship between the cells in each column (except the edge) on the bracket main body 1 and the contacting cells in another adjacent column is the same as that of the first cell 2 and the second cell. The positional relationship among the cell 31, the first cell 2 and the second cell 32 is the same.

From the positional relationship between the first cell 2 and the second cell 31, the first cell 2 and the second cell 32, it can be seen that when the first cell 2 deformed, due to its short side and the second cell The long sides of the cell 31 share a side, and its long side shares a side with the short side of the second cell 32, so when the first cell 2 is deformed by external force, it will be in the second cell 31 and the second cell. Under the containment of grid 32, the original shape is restored. Similarly, each unit cell in the stent body 1 will be restrained by contacting other cells, so that the stent body 1 has elasticity in the radial direction, that is, it has a strong radial support force.

In addition, in the embodiment of the present application, the acute angle tips of the first unit cell 2 and the second unit cell 3 are provided with undercut protrusions, as shown in Figure 2 and Figure 3, the two undercut protrusions of the first unit cell 2 is 4, and the two undercuts of the second cell 3 are 5. On the acute angles of the parallelograms of the first unit cell 2 and the second unit cell 3, there are undercut protrusions, the functions of which are: first, to guide the deformation direction of the unit cells; second, to reduce the stress concentration during the deformation process of the bracket, When the stent is deformed, it can buffer and protect the stretching or extrusion of the structural components of the stent main body 1 . In addition, the angle of the obtuse angle on the first cell 2 and the second cell 3 is the same, and in the embodiment of the present application, the angle of the obtuse angle is selected to be 95-175 degrees.

The vascular stent provided in the embodiment of the present application includes a stent body with a network tubular structure, and the grid on the network tubular structure is composed of multiple columns of interlaced cells in the shape of a parallelogram. In two adjacent columns of cells, The long side of the cell in one column is on a straight line with the short side of the contacting cell in the other column, and the short side is on a straight line with the long side of the contacting cell in the other column. Each unit cell is a centrally symmetrical structure. When the main body of the stent of the network tubular structure is deformed and bent by an external force, each unit can rotate around its center of symmetry, so that the stress concentration during the deformation of the vascular stent is reduced. The stretching or extrusion of the main body of the structural support acts as a buffer and protection, maintaining the shape of the network-like structure. Therefore, the vascular stent has sufficient supporting strength in the radial direction, can support the narrowed blood vessels at the lesion, and has good flexibility in the axial direction, and can realize uniform bending.

At the same time, the stent body of the vascular stent is composed of multiple rows of parallelogram cells, so that the vascular stent can be radially compressed into a delivery system with a small diameter during surgery, increasing the flexibility and scope of application of the delivery system .

In addition, the multiple rows of interlaced cells on the main body of the stent make the vascular stent have sufficient metal coverage, not only during implantation, but also when the vascular stent passes through a curved blood vessel, the surface of the vascular stent avoids the appearance of "skin" corners. It can reduce the damage to the blood vessel wall, and after implantation in the human body, it can also effectively cover the vascular lesion.

The above descriptions are only preferred embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A vascular stent, characterized in that it comprises a stent main body, wherein: the stent main body is a network tubular structure composed of multiple rows of interlaced, parallelogram-shaped cells, and two adjacent rows of cells , where the long sides of the cells in one column are parallel to the short sides of the touching cells in the other column, and the short sides are parallel to the long sides of the touching cells in the other column. 2. The vascular stent according to claim 1, wherein the centers of the cells in each row of cells are on a straight line. 3 . The vascular stent according to claim 2 , wherein, among the cells in the two adjacent columns, the cells in one column share the same edge as the contacting cells in the other column. 4 . 4. The vascular stent according to claim 3, wherein the obtuse angle of each cell in the multi-row cells is the same, and the obtuse angle is 95-175 degrees.

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