摘要
Poly(glycerol-dodecanoate)(PGD)has aroused increasing attention in biomedical engineering for its degradability,shape memory and rubber-like mechanical properties,giving it potential to fabricate intelligent implants for soft tissues.Adjustable degradation is important for biodegradable implants and is affected by various factors.The mechanical load has been shown to play an important role in regulating polymer degradation in vivo.An in-depth investigation of PGD degradation under mechanical load is essential for adjusting its degradation behavior after implantation,further guiding to regulate degradation behavior of soft tissue implants made by PGD.In vitro degradation of PGD under different compressive and tensile load has proceeded in this study and describes the relationships by empirical equations.Based on the equations,a continuum damage model is designed to simulate surface erosion degradation of PGD under stress through finite element analysis,which provides a protocol for PGD implants with different geometric structures at varied mechanical conditions and provides solutions for predicting in vivo degradation processes,stress distribution during degradation and optimization of the loaded drug release.
基金
supported by the National Natural Science Foundation of China(T2288101,12172034,U20A20390,11827803)
Beijing Municipal Natural Science Foundation(7212205)
the 111 project(B13003)and the Fundamental Research Funds for the Central Universities。
作者简介
Correspondence address:Lizhen Wang.Tel:+861082339861,E-mail:lizhenwang@buaa.edu.cn;Yubo Fan,Tel:+861082339428,E-mail:yubofan@buaa.edu.cn。
