Key result
Stents with more links or harder materials resist deformation but induce greater vessel wall stress.
Computational modeling demonstrates that stents with more links or harder materials induce greater stress concentration and vessel straightening during flexure, informing future stent design.
Stent flexure models may guide design refinements; leaves open clinical relevance pending experimental validation.
Vessel flexure can be triggered naturally by surgical operation, heart pulsation and body movement. It may affect the mechanical behavior of the stent and the existence of a stent may in turn cause vessel injury. In the present study, the finite element method is employed to study the interaction between stent and vessel during vessel flexure. Two- and four-link stents made of stainless steel 316L and magnesium alloy WE43 are considered. Results indicate that longitudinal deformation of the stent can be caused by vessel flexure, and the higher levels of stress exist in the link struts. The existence of the stent could induce significant stress concentration and straightened deformation on vessel wall in the course of vessel flexure. Stents with more links or made of harder materials show greater anti-deformation capability, thus inducing a more severe stress concentration and straightened deformation on the vessel wall. The bending direction also affects the mechanical performance of the vessel-stent system. The results obtained could provide useful information for better stent designs and clinical decisions.
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Shen et al. (2018) studied Stented coronary artery. Two- and four-link stents (stainless steel 316L and magnesium alloy WE43) was evaluated on Mechanical behavior and stress concentration during vessel flexure. Finite element analysis demonstrated that stents with more links or harder materials exhibit greater anti-deformation capability, inducing more severe stress concentration on the vessel wall.
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