Realistic virtual radial strength testing of stents

摘要: Abaqus Benelux Users’ Meeting 2009 Realistic virtual radial strength testing of stents M. De Beule, P. Mortier, Verdonck, Segers, B. Verhegghe, F. Bakczewitz and N. Gotzen Biofluid, Tissue Solid Mechanics for Medical Applications (bioMMeda) Institute Biomedical Technology (IBiTech), Ghent University, Belgium Cortronik GmbH, Rostock-Waremunde, Germany The most important task a stent is to reopen the artery support or scaffold stenosed lesion in target vessel. To that extent, requires sufficient strength. Experimental evidence has shown that, addition material properties, this also strongly design dependent (Rieu et al., Catheter Cardiovasc Interv, 1999). Its assessment, especially case balloonexpandable stents, sophisticated accurate test set-up dedicated experimental protocol. Complementary such methods, we developed procedure which allows gain valuable insights into impact certain variants on scaffolding potential without having actually manufacture these prototypes and/or materials. This novel numerical by combining with open-source pyFormex software (http://pyFormex.berlios.de). It evaluate following mechanical characteristics: elastic dilatation recoil, compliance after collapse pressure. validated against data PRO-Kinetic stent. was provided manufacturer (Biotronik, Germany). accordance setup implanted PU-tube. simulation strategy consists three steps: (i) crimping using displacement-driven surface subsequent surface/stent contact removal order account recoil; (ii) expansion PU-tube displacement driven (De Beule J Biomech, 2008) recoil (iii) pressure loading outer PUtube assess proposed modelling examine provides results satisfactory agreement as difference between experimentally determined numerically predicted value less than 2%. Figure: Virtual