A covered stent

Abstract

The invention belongs to the field of vascular stents, in particular to a covered stent. The frame body includes at least one keel. A membrane is arranged on that frame body to form a tubular structure. An adjusting member is arranged along the extension direction of the keel, one end of which is fixedly connected with the upper fixing part of the keel, the other part of which is a movable part movable in the longitudinal direction relative to the keel, and the other end of which can bend the keel under the action of an external force. A locking structure is arranged between the adjusting member and the keel, and is adapted to lock the relative position between the movable part and the keel. The covered stent has good universality and can be matched with the curved configuration of the 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. The two ends of the stent-graft "twist" and cannot match the curved configuration of the aortic arch. On the one hand, the two ends of the stent-graft compress or even damage the local vessel wall outside the aorta, leading to complications; on the other hand, the stent-graft covers Once the stent-graft fails to attach well to the vessel wall after implantation, it may increase the incidence of stent-graft detachment or migration under the impact of blood flow, and induce damage to the aortic wall

[0004] In view of the above-mentioned problems, there are also stent grafts in the prior art that are pre-bent in vitro and then implanted in the body, but the curvature of the aortic arch is different for each person, and the versatility of the pre-bent stent graft is not good, and when When the stent-graft does not match the curved configuration of the aortic arch, there will still be a problem that the two ends of the stent-graft will cause local high pressure on the local vessel wall outside the aorta

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