Analysis of radial compression performance of Poly (L-lactic acid) helical stents

This paper aims to study the radial compression performance of poly (L-lactic acid) (PLLA) helical stent and its influencing factors. The theoretical model was established and the radial compression test of PLLA helical stents with different parameters (initial pitch angle, temperature and compression rate) was carried out. The results indicated that smaller initial pitch angle can improve the radial compression performance of the stents. The temperature and compression rate during the test also affect the radial compression performance, and plastic deformation should be taken into consideration. The deformation mechanism of braided stent is different from that of helical stent. The experimental results showed good agreement with theory for the tests. This study would bring new sights to theoretical model and serve the design of PLLA stents.