Thesis : Study on Cracking and Delamination in Polymer Coating s of Cardiovascular Stents In this study, Finite element analysis (FEA) was performed to simulate the stress response of two commercial stents, Xience V (Abbott Vascular) and Resolute (Medtronic Cardio Vascular), during compression and expansion, and to investigate the association with the defects of stent coating. In the following, the strain distribution of magnesium alloy stent coating during the stent compression, expansion and bending was analyzed in relation to the stent degradation rate using FEA. Then, the mixed model of Cohesive Zone Model (CZM) was used to investigate the adhesion and separation mechanism of a stent-coating interface during compression and expansion. Finally, a conventional V-shaped polymer coated stent was manufactured. The adhesion and separation phenomena between the stent and coating was investigated by expanding the stent progressively, and the experimental result was compared with simulation.

Senior Project:Micro-motor center Harmonic Drive moped gearbox design(Patented in 2020 TWI694952B) This study is aimed at electric mopeds, which previously weren’t having any improvements due to the weight and volume of the reducer. This study proposes replacing the original reducer with harmonic gears. The high efficiency of the high-speed motor can improve the overall efficiency by the high gear ratio of the harmonic gear.