Membrane-coated composite stent

Abstract

The present invention relates to a medical device, in particular to a membrane-coated composite stent, a main stent for use in a blood vessel comprise an aneurysm structure, comprising a main stent have a hollow interior, an integral tubular shape and a circular cross-section, that main stent forming a mesh wall structure by metal wire weaving, and a second stent for forming a mesh wall structureby metal wire weaving. A membrane-coated structure having a hollow inside, an integral tubular shape and shorter than the main body stent, the membrane-coated structure and the main body stent coaxially nested with each other to form an overlapping portion of the membrane-coated structure and the main body stent in mutual adherence in a middle region of the main body stent.

Description

technical field [0001] The invention relates to a medical device, in particular to a membrane-covered composite stent. Background technique [0002] Aneurysm is a common cardiovascular and cerebrovascular disease, and once ruptured, the fatality rate is extremely high. With the development of interventional technology, the emergence of stents has greatly improved the curative effect of interventional treatment of intracranial aneurysms. At present, the main clinical stent technologies include stent-assisted coil embolization, blood flow diversion device implantation, and covered stent implantation. Stent-assisted coil embolization can change the hemodynamic state at the aneurysm neck, change the curvature of the parent artery, and act as a "scaffold" for vascular endothelial growth. The blood flow diversion device can change the hemodynamic state in the artery to induce thrombus formation in the aneurysm. The covered stent can isolate the blood flow in the aneurysm and in...

AI Technical Summary

Problems solved by technology

However, the higher the metal coverage of the stent, the higher the radial tension and the poorer the compliance; on the other hand, although the high metal coverage of the stent can effectively change the hemodynamic state of the artery, it may hinder or even block the surrounding arteries. Additional damage to the patient due to blood flow in blood vessels

In addition, blood flow diversion devices are expensive to place

[0006] As another example, the implantation of covered stents can isolate the blood flow in the aneurysm, but it has the risk of covering other perforating arteries and hindering normal blood flow, which limits the scope of use of covered stents.

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