title: A predictive study of the mechanical behaviour of coronary stents by computer modelling.
abstract: Intravascular stents are small tube-like structures expanded into stenotic arteries to restore blood flow perfusion to the downstream tissues. The stent expansion is an important factor to define the effectiveness of the surgical procedure: it depends on the stent geometry and includes large displacements and deformations, geometric and material non-linearity. Numerical analyses seem appropriate to study such a complex behaviour after a free stent expansion. In this study the finite element method (FEM) was applied to a new generation coronary stent. Results from computations were compared with those from a laboratory experiment in terms of radial expansion and elastic recoil. By means of a scanning electronic microscopy the area of plastic deformation were also detected and compared with those obtained in the numerical simulation. Matching between the different measurements was quite satisfactory even if some discrepancies were present due to the absence of the balloon in the numerical model.
authors.affiliation: Laboratory of Biological Structure Mechanics, Bioengineering and Structural Engineering Department, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milan, Italy. francesco.migliavacca@polimi.it
authors.forename: Francesco
authors.initials: F
authors.lastname: Migliavacca
authors.forename: Lorenza
authors.initials: L
authors.lastname: Petrini
authors.forename: Valeria
authors.initials: V
authors.lastname: Montanari
authors.forename: Isabella
authors.initials: I
authors.lastname: Quagliana
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Auricchio
authors.forename: Gabriele
authors.initials: G
authors.lastname: Dubini
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000295:instrumentation* / Q000379:methods; D001807:Blood Vessel Prosthesis; D003198:Computer Simulation; D003331:Coronary Vessels / Q000503:physiopathology* / Q000601:surgery*; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004548:Elasticity; D019544:Equipment Failure Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006801:Humans; D008955:Models, Cardiovascular; D011379:Prognosis; D015607:Stents; D013314:Stress, Mechanical; D016896:Treatment Outcome