Aortic dissection vessel stent and manufacturing method thereof

Abstract

The invention discloses an aortic dissection vascular stent and a manufacturing method thereof. The aortic dissection vascular stent comprises a stent body and a membrane attached to the outer side of the stent body, the stent body is formed by multiple coils in a spiraling mode, and each coil is formed by multiple waves. The manufacturing method includes the steps that a spatial continuous spiral wave curve is constructed through a spatial cylindrical coordinate system; a three-dimensional model of the stent body is obtained in a scanning mode; an entity model of the stent body is made according to the three-dimensional model; a metal wire is wound around the entity model to obtain the stent body; heat shaping and electropolishing are carried out on the stent body; the membrane is arranged on the outer side of the stent body in an electrospinning or hot-pressing mode. Bending of the vascular stent in the bent lumen is uniformly distributed in the whole vascular stent, so that the fitness of the vascular stent is improved, and the situation that the vascular wall is bent or damaged is avoided. Besides, the vascular stent is specially designed for the aortic dissection and is simple in structure, convenient to operate, appropriate in supporting force and suitable for the pathological characteristics of the aortic dissection.

Description

technical field [0001] The invention relates to a vascular stent, in particular to an aortic dissection vascular stent and a manufacturing method thereof. Background technique [0002] Aortic dissection (AD) refers to the rupture of the aortic intima due to various reasons. The blood flow in the aortic lumen enters the aortic media from the aortic intima rupture, tearing and separating the aortic media. And along the long axis of the aorta, it expands proximally and distally, thus forming a pathological change in which the aorta has two true and false lumens. Its onset is sudden and harmful, and the torn vessel wall is weak, which may form an aneurysm or directly rupture and cause massive hemorrhage to death. Severe ischemic necrosis, causing serious complications such as myocardial infarction, cerebral infarction or even death. [0003] At present, endovascular repair of aortic dissection has been carried out, that is, the minimally invasive method of percutaneous stent i...

AI Technical Summary

Problems solved by technology

Its biggest disadvantage is that when it encounters a curved blood vessel, the straight tube-shaped stent will bend, and this bending is concentrated between the rings of the stent, rather than evenly distributed. In this way, the local Bending will lead to poor blood flow in the cavity and poor stent apposition, causing the "bird's beak phenomenon" of the aortic arch stent (the stent on the large curvature side is attached to the wall and the small curvature side is tilted) and Kink at the twisted part of the stent, and even due to the stent The longitudinal stiffness of the head end will cause the friction between the head end and the tube wall and damage the tube wall or the displacement of the stent

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