Covered stent

Abstract

The invention relates to a covered stent. The covered stent comprises a first main body section distributed in the axial direction and a second main body section connected with the first main body section, wherein the axial shrinkage rate of the first main body section is 10%-40%, and the axial shrinkage rate of the second main body section is zero. During use of the covered stent, the first mainbody section is placed in a bent section of an aortic arch, the second main body section is placed in a straight section of the aortic arch, as the first main body section can shrink axially, that is,the first main body section has certain flexibility in the axial direction, the first main body section cannot produce straightening force when following the bending form of the aortic arch, and theoperation safety can be improved; and the second main body section cannot shrink axially, shrinkage of the second main body section under the blood flow action can be avoided, and the condition that the end of the second main body section shrinks to a tumor cavity to endanger life of a patient is avoided.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a covered stent. Background technique [0002] Aneurysm is a clinically common vascular disease, which mostly occurs in the elderly. This disease can easily lead to aortic aneurysm rupture, which poses a great threat to the life of patients. General surgery was once considered the only way to treat aortic aneurysm. The only way, but this method is extremely dangerous. [0003] With the continuous development of medical technology, the use of minimally invasive surgery to implant covered stents into the human body to treat aortic aneurysms and dissecting aneurysms is being used more and more. This treatment method compresses the artificial covered stent into the delivery device, guides it into the human body along the previously implanted guide wire, releases the covered stent to the lesion, isolates the aneurysm cavity and forms a new blood flow channel, and the aneurysm is lost. ...

AI Technical Summary

Problems solved by technology

[0004] Existing stent grafts generally have a straight tubular structure, including corrugated coils arranged at intervals and rigid connectors connecting adjacent corrugated coils. Since the anatomical shape of the blood vessels in the aortic arch is a curved structure, the stent graft will be straight after implanted in the aortic arch. It needs to be passively bent in accordance with the bending angle of the blood vessel. The rigid connector of the covered stent will generate elastic recoil force and the resulting stress on the aortic wall, which will easily lead to a new aortic tear, which is the repair of aortic dissection. Key factors leading to death after surgery

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