A Degradable Scaffold Structure with Low Axial Elongation

Abstract

A degradable stent structure with a low axial elongation rate relates to the field of vascular stents. An axial latching device is used to constrain the axial elongation of an expanded stent in orderto reduce radial rebound of the stent. A sliding strip with a latching structure is inserted among every three supporting ribs from the middle connecting rib of the stent along two axial sides, and the latching structure of the sliding strip makes the sliding strip restricted at a specific position after the expansion of the stent ends in order to prevent the axial elongation of the stent. The above structural design allows the axial shortening to occur during the expansion of the blood vessel stent, and prevents the axial elongation of the stent after the expansion ends, so the radial reboundof the stent is reduced, and finally the supporting performance of the stent is improved. In addition, the sliding strips are circumferentially uniformly distributed, so the uniform expansion of thestent is ensured.

Description

technical field [0001] The invention relates to the field of vascular stents, in particular to a degradable stent with low axial elongation, that is, a telescopic strip with a locking structure is inserted between every three connecting ribs along the axial direction of the stent. Background technique [0002] At present, stenting, as the main way to treat vascular stenosis, is accepted by more and more doctors and patients. Vascular stent, as a tiny tube network-shaped structure, is placed into the stenotic segment of the blood vessel to expand and support the lesion. During the expansion process, the vascular stent expands the narrow lumen by squeezing and stretching the plaque on the artery wall, thereby reducing the degree of stenosis of the blood vessel and ensuring the blood flow of the blood vessel. After the expansion is completed, the vascular stent expands to the maximum displacement and undergoes plastic deformation, which plays a certain role in supporting the v...

AI Technical Summary

Problems solved by technology

The stent often has a large residual stenosis after expansion due to its large axial elongation, and the dog bone effect is large, which seriously affects the clinical treatment effect of the stent

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