Vessel stent and production method thereof

Abstract

A vascular stent and a method for manufacturing same. The vascular stent has a mesh-shaped tubular structure. The mesh-shaped tubular structure is formed by braiding a metal wire and a biodegradable wire. The vascular stent has the following advantages: First, the stent has a thinner wall, facilitating implantation of the vascular stent into a narrower blood vessel and reducing the risk of restenosis after the stent is implanted in a small blood vessel. Secondly, the rejection caused by the presence of foreign bodies in the human body is reduced, and endothelialization of tissues is promoted. Thirdly, the vascular stent is allowed to have a greater mesh density, so that hemodynamics at the lesion site in the blood vessel can be improved after the vascular stent is implanted in the human body.

Description

technical field [0001] The present invention generally relates to medical devices, and in particular to pipeline stents (such as vascular stents). In particular, in a first aspect, the invention relates to pipe supports. In a second aspect, the invention relates to a method of making a conduit scaffold. Background technique [0002] With the continuous development of endovascular treatment technology, various types of covered stents are widely used. The main structure of the covered stent is a foldable pipeline stent composed of a base in the form of a metal support frame and an artificial vascular membrane covering the inner or outer wall of the metal support frame. The therapeutic principle of the covered stent is to use the pipeline structure formed by the stent to isolate the dilated vascular disease and blood flow, so as to avoid the expansion and rupture of the diseased blood vessel and ensure the smooth flow of the blood vessel access. The use of the stent has achi...

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Problems solved by technology

[0003] However, the disadvantage of the covered stent is that when the shape or location of the lesion is not suitable for endovascular exclusion, such as the proximal end of the tumor or the opening of the dissection adjacent to important blood vessel branches, the neck of the aneurysm is too short, resulting in inability to Provide sufficient location for graft proximal anchoring, or when the lesion involves extensive thoracoabdominal aorta, or aortic dissection involves important branch vessels such as the brachiocephalic trunk, left common carotid artery, left subclavian artery, and celiac trunk, graft The placement of the object will also cover these branch vessels while isolating the tumor, which will lead to serious consequences.

[0005] However, the disadvantages of this multilayer mesh stent are: firstly, the multilayer metal hard stent has a large volume after shrinkage, and needs to be assembled in a guide sheath with a large diameter, which is not conducive to the delivery of the graft; secondly, when When this kind of graft is used for blood vessels with small diameter, the multilayer hard stent will make the diameter of the vessel narrower

[0008] The defect of this metal three-dimensional mesh stent is that, on the one hand, the two kinds of wire materials used in the braiding of the stent are metal wires, and the wire diameter is relatively large, so the mesh density of the stent obtained by weaving is limited; on the other hand, the stent used Although the two kinds of metal wires have good biocompatibility, they are foreign bodies after all compared to the human body, which will cause certain rejection reactions, and are not conducive to the rapid endothelialization of tissues after implantation in the human body.

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