8 Fig. 6 a) Normal and b) shear forces of the original, Mod1 and Mod2 stents in 3-step TSI simulation Stent fatigue analysis. The strain amplitude of the original model is 8.43E-2% and the safety factor is 4.75. Decreasing in strain amplitudes of Mod1 and Mod2 (6.61E-2% and 6.68E-2%) resulted in higher safety factors of 6.05 and 5.98, respectively. Changing stent thickness does not reduce the fatigue life of the stent in the PTMA intervention. As shown in Fig. 7, strain points on the Goodman diagram of Mod1 and Mod2 are similar to the strain points of the original design, and all are condensed and below 0.1% strain amplitude and 1% mean strain. Figure 7 – Goodman diagrams of the stent models. DISCUSSION/CONCLUSION The evaluation of PTMA device performance was performed based on two criteria: 1) inducing a minimal vessel injury and 2) enabling stent mechanical function (i.e., anchoring and fatigue life). The mechanical stress on the vessel wall
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