An injection-molded biodegradable polymer vascular stent

Abstract

The invention provides a biodegradable polymer blood vessel support subjected to injection molding, belongs to the technical field of medical machinery, and relates to the biodegradable polymer blood vessel support which is molded by adopting an injection method. The support is composed of equal-height waveform support units, non-equal-height waveform support units, an arc connection unit and a straight rod connection unit; each equal-height waveform support unit is constituted by evenly arranging six or eight equal-height basic waveforms in the circumferential direction. Each non-equal-height waveform support units is constituted by alternately and circularly arranging six or eight non-equal-height basic waveforms in the circumferential direction, two adjacent non-equal-height waveform support units adopt a heterogeneous arrangement form, and the phase difference is 90 degrees. The biodegradable polymer blood vessel support subjected to injection molding has good radial support performance, flexibility, axial abbreviation and inflation / compression uniformity. The radial mechanical support performance is improved, the radial rebound rate is lowered at the same time, and the support structure can be molded by adopt the injection method.

Description

technical field [0001] The invention belongs to the technical field of medical devices and relates to a biodegradable polymer vascular stent formed by injection molding. Background technique [0002] Because the biodegradable polymer stent can be degraded into lactic acid and water and other products that can be absorbed by the human body after curing the diseased blood vessel, it fundamentally solves the late thrombus and thrombosis caused by the long-term existence of bare metal stents and drug-eluting stents in the body. In-stent restenosis and other problems. Therefore, biodegradable polymer vascular stents are an important direction of current vascular stent research. [0003] However, because the mechanical properties of polymer stent materials are much worse than metal stent materials, methods of increasing wall thickness and increasing the number of straight rod connecting units are usually used to improve the mechanical properties of the stent, as NIELS GRABOW publ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects existing in the design of the existing vascular stent structure, and to invent a biodegradable polymer vascular stent structure. The unequal height waveform support unit of the vascular stent is composed of a small basic waveform and a large basic waveform. During the expansion process, the small basic waveform is expanded to a nearly straight line state, which has higher resistance to blood vessel compression, improves radial mechanical support performance, and reduces radial rebound rate

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