OBJECTIVE:the shortage ratio and dogboning ratio of the new style stent expanded were calculated to determine whether the strcture is reasonable.METHOD:the unrestricted stent was expanded in FEA software ANSYS9.0

the technology of finite element analysis of stent expansion from its initial status including geometry modeling、material selection、meshing、boundary conditions、loads definition in the condition which interacting stent、artery and plaque that unconsidered was studied. RESULTS:The shortage ratio and dog boning ratio of stent calculated based on the FEM results were separately 10.9% and 2.57%. To validate the simulation

a real stent was expanded; the experiment proved the error between the real expansion result and the finite element analysis result were separately 0.3%and1.32%.. CONCLUSION: the expanded stent was uniformity

the structure designed is correct. Using finite element to simulate the coronary stent was feasible

which could help the design and use of the stent. Keywords: Coronary stent finite element analysis expansi