Comparison of compression behaviors of fully covered biodegradable polydioxanone biliary stent for human body and uncovered biodegradable polydioxanone biliary stent: A numerical approach by finite element model

A comparison of compression behaviors between fully covered biodegradable polydioxanone (PDO) biliary stents (FCBPBSs) and uncovered biodegradable polydioxanone biliary stents (NBPBSs) was made by the finite element method. Numerical models for FCBPBSs and NBPBSs were established to investigate the relationship between the compression force and structural parameter (monofilament diameter and braid-pin number). The simulation and experimental results after calculating the compression force derived from both experiment and simulation results are in good agreement with each other, indicating that the simulation results can provide a useful reference for the investigation of biliary stents. The stress distributions for FCBPBSs and NBPBSs were studied, and the plastic dissipation analysis and plastic strain of FCBPBSs were obtained via simulation of compression of the film layer of the FCBPBSs. The film layer of FCBPBSs contributes greatly to the differences in mechanical properties, such as stress distribution, plastic dissipation and plastic strain, between FCBPBSs and NBPBSs.