A covered stent

Abstract

The invention belongs to the field of vascular stents, in particular to a covered stent. The covered stent comprises a frame body; a membrane disposed on the frame body to form a tubular structure. The tubular structure is in a bent state before implantation. One of the membrane and the frame body is in a bent state before implantation, and the other is in a straight state before implantation. The covered stent of the invention is simple in implantation and can be matched with a curved aortic arch.

Description

technical field [0001] The invention belongs to the field of vascular stents, in particular to a covered stent. Background technique [0002] Aortic aneurysm and aortic dissection are frequent diseases in the cardiovascular system. Among them, aortic aneurysm is manifested by local expansion of the artery, and the mechanical properties of the vessel wall are reduced. After the condition worsens, it is easy to cause aneurysm rupture, and the mortality rate is extremely high. Media and adventitia, caused by the formation of false lumen, the most serious result is dissection rupture and bleeding, the rupture process is very painful and the mortality rate is also high. At present, both diseases can be treated by implanting a covered stent, which separates the blood from the vessel wall and prevents the blood flow from directly acting on the vessel wall. However, a large number of case follow-up records found that there are still a certain proportion of patients with postoperat...

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Problems solved by technology

However, a large number of case follow-up records found that there are still a certain proportion of patients with postoperative complications

[0003] According to the detection of stent grafts in patients, the following problems will occur after implantation of stent grafts: Since the commonly used aortic stent grafts are straight before implantation, after implantation of the curved aortic arch, the rigidity of the material itself will cause problems. Causes the ends of the stent graft to "twist" to match the curved configuration of the aortic arch

On the one hand, both ends of the stent-graft compress or even damage the outer local vessel wall of the aortic arch, leading to complications; May increase the incidence of stent graft shedding or migration, and induce aortic wall damage

[0004] In response to the above-mentioned problems, some stent grafts in the prior art are shaped to match the curved aortic arch during production, which can reduce the rebound force generated by the existing stent graft after passive bending of the aortic arch. , but the stent-graft is shaped into a curved shape in vitro, and special equipment is needed to help implant the stent-graft into the aortic arch, which increases the cost of implantation and is more complicated to operate

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