Intravascular stent

Abstract

The invention relates to an intravascular stent. The intravascular stent comprises a plurality of supporting rings and a plurality of connecting rods, wherein the supporting rings are distributed at intervals in the length direction of the intravascular stent, the connecting rods are arranged between and connected with every two corresponding adjacent supporting rings, and the wall thickness of at least one part of the connecting rods is smaller than the wall thickness of the supporting rings. According to the intravascular stent, the design of different wall thicknesses can be carried out in a specified position area, and the detail structure of the intravascular stent is adjusted to achieve the effect that the intravascular stent has different wall thicknesses, so the flexibility of a thinned position (namely a connecting rod) can be ensured, the generation of a low-shear-stress area is reduced, vortex generation probability is reduced, a secondary stenosis rate is reduced, the strength of other positions (namely the supporting rings) with the non-thinned walls is ensured, and the whole intravascular stent still keeps good supporting performance.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a blood vessel stent. Background technique [0002] Atherosclerosis is currently considered to be a chronic inflammatory disease that starts at a young age and lasts for decades, and clinical symptoms of atherosclerosis usually appear in adulthood. The basic pathological change is the formation of plaques on the intima of the arteries, including lipid streaks, fibrous plaques, and atheromatous plaques, which can cause vascular lumen stenosis or thrombosis. Among them, the interventional medical treatment of vascular stents has become the main treatment method for such vascular diseases. [0003] However, many studies have shown that after the stent is implanted, the blood flow mode near the stent will change when the blood flows through it, and the fluid environment plays an important role in the repair of the damaged intima of the blood vessel and the generation of ...

AI Technical Summary

Problems solved by technology

[0004] In response to the above problems, two technical routes are currently adopted, one is to reduce the wall thickness of the vascular stent, but there are certain defects in the overall thinning of the wall thickness of the vascular stent, and the thinning of the wall thickness will lead to a decrease in extrusion resistance. Vascular stents cannot provide enough supporting force to prop up the lesion. In addition, as the wall thickness becomes thinner, the vascular stent becomes more fragile as a whole, and it is easy to twist and deform when encountering calcified lesions

The other is to adjust the overall structure of the vascular stent, such as adjusting the length of the vascular stent, the number of support rings, the number of connecting rods, etc., to improve the intravascular hydrodynamic environment by changing the flexibility of the vascular stent, but blood flows through the blood vessel There is still vortex generation during stenting, which usually increases the risk of in-stent restenosis

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