Abstract: Longitudinal stent strength was one of the most important mechanical properties of coronary stents, and the longitudinal deformation behavior of stent resulted from the lack of longitudinal strength had become one of the most serious complications of percutaneous coronary stent implantation. This paper established the model of the longitudinal tensile stent to systematically analysis the effects of stent expansion diameter, force load position, connector shape and circumferential connector number between struts on longitudinal tensile deformation behavior of the stent. Results showed that connector number played the most significant role on longitudinal tensile deformation, and increasing the connector number could substantially improve the longitudinal resistance. The connector shape played the second significant role on longitudinal tensile deformation, and the longitudinal resistance could be proved 50% when the longitudinal displacement of the stent was 0.5 mm and the connector shape was transformed from the S-stent to L-stent. For the same connector shape, increasing expansion diameter could likely occur the longitudinal deformation. Simultaneously, the results demonstrated the end of proximal and distal of stent was more longitudinal deformation than the middle of stent. Reasonably changing stent design parameters could effectively improve longitudinal tensile deformation. Conclusions obtained from this paper can help designers to optimize the stent design to reduce the longitudinal deformation.
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2017, Vol. 31 
