Tubular cavity stent

Abstract

The invention discloses a tubular cavity stent which comprises a bare stent section and a covered stent section connected with the bare stent section. The bare stent section comprises at least two coaxial wave-shaped annuluses and rigid connecting parts and further comprises non-elastic flexible connecting parts capable of being optionally bent, wherein every two wave-shaped annuluses of at least two coaxial wave-shaped annuluses are connected through the corresponding rigid connecting part and the corresponding flexible connecting part, the rigid connecting parts and the flexible connecting parts are arranged in the circumferential direction in a mixed mode, and the length of each flexible connecting part is slightly greater than the shortest separation distance between every two wave-shaped annuluses. The flexibility of the tubular cavity stent can be improved, and the axial connecting strength of the tubular cavity stent can be kept.

Description

Technical field [0001] The invention belongs to the technical field of medical devices, and relates to a stent in a lumen, in particular to a lumen stent used in the aorta. Background technique [0002] In aortic diseases, there are mainly two types of diseases: aortic dissection and aortic aneurysm; aortic aneurysms are further divided into aortic true aneurysms and aortic pseudoaneurysms. Aortic aneurysm and aortic dissection are extremely dangerous diseases. The mortality rate within 48 hours after the onset is greater than 50%, and the mortality rate within two weeks is greater than 85%, which has seriously threatened human health. With the advent of China's aging trend, its incidence will continue to rise. [0003] Among patients with aortic aneurysm, patients with abdominal aortic aneurysm account for 63% to 79% of the prevalence of aortic aneurysm, and it mostly occurs in the elderly over 60 years old, with an incidence of 2% to 4%, and more men than women , Ranked 13th am...

AI Technical Summary

Problems solved by technology

Bare stents with anchors can be divided into single-loop structure and multi-loop structure according to their basic composition structure (currently, the industry generally has two loops). Due to the short axial length of the stent due to the complex and curved vessel anatomy, the anchor on one side of the bare stent will be excessively attached to the vessel wall, and the anchor on the other side will be separated from the vessel wall and hang in the air, which will affect its Anchoring performance

[0008] The multi-turn structure with multi-turn wavy rings can avoid the above disadvantages, but the connection between adjacent wavy rings will bring new problems. Currently, the adjacent wavy rings are connected by rigid connectors Together, such as in adjacent wave-shaped rings, where the distal apex of one wave-shaped ring is connected to the proximal apex in the other wave-shaped ring, metal thin rods are connected. This rigid connection increases the bare stent The overall connection stiffness avoids the shortening of the stent, but it causes the problem of poor flexibility. It is difficult for the bare stent to adapt to changes in the angle of the blood vessel. probability of occurrence

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