Stent Graft

Abstract

The invention relates to a covered stent, comprising a bare metal stent and a covering film covering the bare metal stent, and the covered stent includes a first area and a second area connected to the first area along the circumferential direction , the first region and the second region both extend along the axial direction of the stent-graft, and the cross-sectional area of ​​the metal wire of the bare metal stent in the first region is smaller than that in the second region The cross-sectional area of ​​the metal wire of the bare metal stent, the cross-sectional area of ​​the metal wire in the first region is 0.005-0.1257mm 2 . For the above covered stent, since the metal wire in the first region of the bare metal stent has a smaller cross-sectional area and less rigidity, the metal wire in the first region is prone to deformation to form a window that is closer to a circle, which is convenient for window opening. After completion, after the balloon is withdrawn, the metal wire has the force to return to the original position, so that the metal wire closely fits the branch stent, which can reduce the risk of endoleak at the position where the covered stent is connected to the branch stent.

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 reconstruct the important branches of the aorta is currently a major problem in endovascular aortic aneurysm re...

AI Technical Summary

Problems solved by technology

[0004] However, the existing in situ fenestration technology has the following problems: after the stent-graft is implanted into the aorta, the metal stent of the stent-graft is easily placed at the opening of the branch vessel, causing the puncture needle to be on the stent-graft at the opening of the branch vessel. The opening fails, or, when the edge of the fenestration is opened along the metal stent, after the branch stent is implanted at the fenestration, the shape of the connecting part of the branch stent and the stent-graft is likely to be restricted by the metal stent at the edge of the fenestration, As a result, the sealing of the connecting part of the branch stent and the covered stent is not good, and the blood flow easily flows from the connecting position to the tumor cavity / false cavity, resulting in type III endoleak

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