Covered stent

Abstract

The invention relates to a covered stent. The covered stent comprises a bare metal stent and a membrane covering the bare metal stent. The covered stent further comprises a first area and a second area connected with the first area along the peripheral direction, wherein the first area and the second area extend along the axial direction of the covered stent; and the ductility of the membrane in the first area is less than that in the second area. According to the covered stent, after a window is formed in the membrane of the first area, the membrane at the window has relatively small deformation under the long-term effect of a branch stent since the ductility of the membrane in the first area is relatively small, so that the risk of endoleak of the covered stent at the window in a long term can be reduced; and the membrane of the second area has relatively large ductility and relatively good flexibility, so that the covered stent can easily fit the bent shape of a blood vessel.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a covered stent for in-situ fenestration. Background technique [0002] Over the past ten years, endovascular repair has become a routine treatment for thoracic aortic aneurysm, aortic dissection, and abdominal aortic aneurysm due to its definite curative effect, less trauma, quick recovery, and fewer complications. However, the principle of endovascular repair technology requires that the lesion has sufficient proximal and distal anchoring areas, and many aortic aneurysms or aortic dissection lesions are close to important arterial branches, which is a taboo for conventional endovascular repair techniques . For example, there are three important branches of the aortic arch, the brachiocephalic trunk, the left common carotid artery, and the left subclavian artery. How to establish the important branches of the aorta is currently a major problem in endovascular aortic aneurysm repa...

AI Technical Summary

Problems solved by technology

[0004] However, the existing in-situ window opening technology has the following problems: the window position is subject to long-term force of the branch bracket, which is prone to extension and enlarges the window, resulting in internal leakage at the window position

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