doi:10.16186/j.cnki.1673-9787.2020090085

Received:2020/09/19

Revised:2021/03/03

Published:2022/07/15

Study on the effect of ultrasonic excitation on the mechanical properties of micro-embossing PPDO vascular stent

BIAN Pingyan1, SHI Jiangong1, WANG Yueyu2, LI Yu1, WANG Jianping1

1.School of Mechanical and Power Engineering， Henan Polytechnic University， Jiaozuo 454000 ， Henan， China;2.Cloud Enterprise Solutions Business Group， Zhengzhou  451162 ， Henan， China

Abstract: In order to obtain higher radial support strength of the vascular stent and to prevent restenosis during vascular repair,the influences of micro-embossing and ultrasonic micro-embossing on the forming performance and crystallization behaviour of poly ( p-dioxanone) (PPDO) vascular stent were compared in this paper. SEM inspection showed that under the same conditions ( temperature , pressure ) ,the stent of high spherulites density , refined spherulites , good filling effect and high replication accuracy were obtained by using ultrasonic micro-embossing. The mechanical performance test results showed that the radial support strength of the ultrasonic micro-embossing stent was increased by about 30% on average. The XRD analysis results indicated that the stents formed by the two processes were consistent with the peak positions of the standard PPDO material in XRD pattern,and both appeared at the same position (about 21°) with the strongest diffraction peaks. The peak shape of the strongest diffraction peak appearing on the ultrasonic micro-embossing stent was relatively sharper and the peak surface was larger,this revealed that the mechanism of ultrasonic excitation was to increase the crystallinity rather than to trigger the appearance of a new crystal structure of PPDO. Through the ultrasonic excitation , crystallinity was improved, crystal grains were refined,and mechanical properties of polymers were promoted significantly. It was expected to obtain higher radial support strength with the same or even smaller thickness.

Key words:poly （p-dioxanone ）;vascular stent;ultrasonic micro-embossing;spherulite;radial support strength;crystallization behaviour

超声激励对微压印PPDO血管支架的力学性能影响研究_卞平艳.pdf