Stainless and shape memory alloy coronary stents: a computational study on the interaction with the vascular wall

• DOI: 10.1007/s10237-004-0039-6
• Publication Date: 2004-06-07T09:22:43Z
• Authors: Francesco Migliav...; Lorenza Petrini; Paolo Massarotti; Silvia Schievano; Ferdinando Auricchio; Gabriele Dubini
• Keywords: finite element method; 0206 medical engineering; computational study; 610; Coronary Artery Disease; 02 engineering and technology; Prosthesis Design; coronary stent; Materials Testing; Alloys; Humans; Computer Simulation; Diagnosis, Computer-Assisted; Models, Cardiovascular; Arteries; Stainless Steel; Coronary Vessels; Elasticity; Blood Vessel Prosthesis; Equipment Failure Analysis; Surgery, Computer-Assisted; Computer-Aided Design; Stents; Stress, Mechanical

Balloon-expandable and self-expandable stents are the two types of coronary stents available. Basically, they differ in the modality of expansion. The present study analyses the stress state induced on the vascular wall, by the expansion of balloon- and self-expandable stents, using the finite element method. Indeed, modified mechanical stress state is in part responsible in the restenosis process. The balloon-expandable stents herein investigated are assumed to be made of stainless steel, while the self-expandable stents are made of a shape memory alloy. The effects of the severity of the coronary stenosis, the atherosclerotic plaque stiffness and the stent design are investigated. Comparing the self-expandable stent with the balloon-expandable one, the former induces fewer stresses and lower damage to the vessel, but, on the other hand, its lower stiffness induces a lower capability to restore vasal lumen and to contrast arterial elastic recoil.