CN214208596U

CN214208596U - Balloon expanding type blood vessel stent

Info

Publication number: CN214208596U
Application number: CN202023060244.9U
Authority: CN
Inventors: 孙成; 江旭东
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-09-17
Anticipated expiration: 2030-12-18

Abstract

The invention provides a balloon-expandable intravascular stent which comprises two parts, namely an annular support body and a regular hexagonal connecting piece. The adjacent annular supporting pieces are connected with the supporting body or the connecting piece through laser welding; the annular support body is composed of a plurality of S-shaped components, and the modular components can be spliced according to specific requirements, so that the requirements of patients on different lengths of diseased blood vessels and different sizes of stents are met; the regular hexagon connecting piece can increase the joint area and the friction force between the stent and the blood vessel and increase the stability of the stent. The utility model has the advantages that the support and the flexibility are considered, the good support can effectively avoid the vascular stent from the mechanical damage of the vascular intima caused by the deformation, and the service life of the stent is prolonged; the good flexibility of the stent can influence the over-bending capability of the whole stent in a bent blood vessel, thereby reducing the operation difficulty.

Description

Balloon expanding type blood vessel stent

Technical Field

The utility model relates to a sacculus expanding blood vessel support belongs to the medical instrument field.

Technical Field

The blood vessel stent implantation can implant a stent into a lesion section through a traditional balloon dilatation catheter so as to achieve the purposes of supporting a blood vessel at a stenotic occlusion section, reducing the elastic retraction and reshaping of the blood vessel and keeping the blood flow of a lumen smooth. The vascular biological tissue consists of three fiber structures of an inner membrane, a middle membrane and an outer membrane, and the sclerotic plaque is attached to the vascular inner membrane tissue to reduce the flow area of the blood vessel and form a narrow blood vessel. The crimping and expansion of the vascular stent are two important links in stent intervention treatment. The intravascular stent is directly arranged at the pathologic change part of the blood vessel, the intravascular stent is attached to the surface of the expansion balloon by contracting and pressing the shell, the blood vessel is radially expanded and expanded by expanding the balloon, and the contact constraint between the unloading balloon and the intravascular stent is released.

When the structure design of support, often in order to realize above-mentioned purpose, the utility model discloses a following scheme: a stent for a narrow blood vessel, the main body of the stent is a plurality of symmetrical annular supporting bodies, and the adjacent supporting bodies are connected by a plurality of regular hexagon connecting pieces.

In the prior art, in order to maintain better support, flexibility of the support is sacrificed. However, increasing the flexibility of a stent often plays a very important role in the surgical procedure and post-operative recovery. The flexibility of the stent can influence the over-bending capability of the whole stent in a bent blood vessel, so that the damage of the stent to the blood vessel is reduced, and therefore, a stent structure which can give consideration to both the supporting property and the flexibility is needed to be developed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a sacculus expanding blood vessel support, improve blood vessel support's support nature and compliance.

The annular supporting body is formed by splicing a plurality of S-shaped components and is arranged alternately, and the diameter of the annular supporting body is basically unchanged.

The S-shaped component is formed by combining straight lines and semicircles, the section of the S-shaped component is circular, and the diameter of the semicircle is the largest and is 1.5-2 times of the width between the two straight lines on the connecting piece.

The material of supporter is stainless steel, and the material of connecting piece is nickel titanium alloy to the diameter of the two equals, and stainless steel material can guarantee the good support nature of support, and nickel titanium alloy guarantees the outstanding compliance of support.

The blood vessel support is formed by splicing a regular hexagonal connecting piece and an annular support body, the regular hexagonal connecting piece and the annular support body are connected by a laser welding technology, the connecting ribs adopt regular hexagonal structures with uniform stress, and meanwhile, the laser welding technology is also adopted at positions without the connecting pieces, so that the partial structure of the support body is in an X shape, and the mechanical conditions of the support body on the pressing and holding shrinkage requirements in the saccule are met; when the intravascular stent bears the pressure of the blood vessel, the regular hexagonal connecting piece can increase the contact area with the inside of the blood vessel, and further improves the support property, so that the utility model discloses with the support property of the support that does not lose as the prerequisite, can also guarantee the good compliance of intravascular stent.

The utility model has the advantages that the intravascular stent can not only ensure the actual medical effect, but also improve the operability of medical personnel; the influence of the geometric structure of the connecting piece of the stent on the damage of the wall surface of the blood vessel is low, and the connecting piece is fully contacted with the plaque of the blood vessel; experiments show that the position of the stent which is most prone to fracture and failure in the expansion process is the junction of the support body and the connector, and the regular hexagonal connecting piece can effectively resist the vascular stent damage caused by external force.

Drawings

Fig. 1 is a schematic deployment view of a balloon-expandable vascular stent structure.

In the figure, 1, a ring-shaped support; 2. a regular hexagonal shaped connector; 3. and (7) welding points.

Detailed Description

The following describes the present invention with reference to the accompanying drawings.

As shown in figure 1, the balloon expandable stent has a stent main body composed of a plurality of annular struts 1 distributed in the axial direction, and the adjacent struts 1 are connected by regular hexagonal connecting pieces 2 and welding points 3.

The balloon expandable stent adopts a modular design mode, namely an S-shaped component assembly and a regular hexagonal connecting piece assembly, and the components are connected by welding.

The annular support body 1 is composed of a plurality of S-shaped components, and the modular components can be spliced according to specific requirements, so that the requirements of patients with different lesion blood vessel lengths and different length stents and the requirements of patients with different blood vessel inner diameters and different sizes are met; the cross section of the annular support bodies is circular, the S-shaped components are distributed in parallel, the annular support bodies 1 are sequentially and longitudinally arranged along the longitudinal direction of the intravascular stent, and the adjacent two groups of annular support bodies 1 are symmetrically distributed.

The annular supporting body is connected with the regular hexagon connecting piece through welding, namely the S-shaped components and the regular hexagon connecting piece.

The regular hexagonal connecting piece 2 is hexagonal, the section of the metal wire is circular, and the overall diameter is basically kept unchanged.

The regular hexagonal connecting piece 2 has multiple advantages, and the nickel-titanium alloy material is adopted, so that the flexibility of the blood vessel stent can be considered, and the support body made of stainless steel material keeps good support performance; from mechanics angle analysis, other structures are compared to confined hexagonal equilateral regular hexagon structure, can obtain the biggest stress with minimum material, and when the regular hexagon structure received the planar load of perpendicular to, the bending resistance rigidity is high, can effectively avoid the vascular intimal mechanics damage because of warping arouses moreover, has avoided the intravascular restenosis problem after the support intervenes to a certain extent.

The utility model discloses can increase the junction area and the frictional force between support and the blood vessel, increase support stability, reduce the support aversion incidence, especially the introduction of regular hexagon connecting piece, further reduce the influence that the change of vascular intracavity hemodynamics brought, reduce postoperative support failure rate, increase the life of support.

Claims

1. A balloon expandable stent is characterized by comprising a plurality of groups of annular supporting bodies (1) and regular hexagonal connecting pieces (2) connected among the annular supporting bodies; the annular supporting bodies (1) are longitudinally arranged along the vascular stent in sequence, two adjacent groups of annular supporting bodies (1) are symmetrically distributed, the regular hexagonal connecting pieces (2) are hexagonal, the cross section of each regular hexagonal connecting piece is circular, and the overall diameter of each regular hexagonal connecting piece is kept unchanged.

2. The balloon expandable stent according to claim 1 wherein the annular supporting body (1) is composed of a plurality of S-shaped members, the regular hexagonal connecting members are regular hexagons, and the S-shaped members and the regular hexagonal connecting members are connected by welding.