Introduction Clinically, adaptation of an implanted stent to the vessel wall influences the development of problems such as intimal hyperplasia and in-stent-stenosis for intracranial stenting. In particular, for the stenting in a curved vessel, it was indicated that a stent deployed across an artery with angulation exerts a certain longitudinal rebounding cause of vessel straightening. For this reason, it is necessary to investigate stent-artery interaction including stress distribution and vessel deformation due to stent designs within the realistic curved arterial model.
Materials and Methods The aim of this study is to analyze and evaluate the stress distribution within the stented curved artery using open and closed-cell stent designs. We focused on stent geometries and calculated the differences in stress within the realistic curved artery due to the structure and stent position using deformation analysis with finite element modeling.
Results The results have different stress behavior by stent designs and its position within the parent artery. High stress values were obtained in the curved portion and at the proximal section of the parent artery with the area of contact between stent strut and the artery for all models. This behavior could be explained by differences the metal-to-artery ratio on each side of proximal and distal vessel according to stent position. Furthermore, vessel straightening was obtained for curved section with stented artery due to longitudinal rebounding force of the stent. Comparing the distribution of high stress area for stent designs, open-cell stent has lager area of high stresses than closed-cell stent at distal portion. In the other hand, the stress distribution of closed-cell was similar for different stent position.
Conclusion For our simulation, stent behavior such as stress status and vessel deformation was varied by stent design and its position within the curved artery. This numerical method might be effective for designing a better stent specifically for the intracranial stenting and also to select an appropriate stent prior to the actual endovascular procedure.
Competing interests None.
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