title: Finite element modeling of a novel self-expanding endovascular stent method in treatment of aortic aneurysms.
abstract: A novel large self-expanding endovascular stent was designed with strut thickness of 70 μm × 70 μm width. The method was developed and investigated to identify a novel simpler technique in aortic aneurysm therapy. Stage 1 analysis was performed after deploying it in a virtual aneurysm model of 6 cm wide × 6 cm long fusiform hyper-elastic anisotropic design. At cell width of 9 mm, there was no buckling or migration of the stent at 180 Hg. Radial force of the stents was estimated after parametric variations. In stage 2 analysis, a prototype 300 μm × 150 μm stent with a cell width of 9 mm was chosen, and it was evaluated similarly after embedding in the aortic wall, and also with a tissue overgrowth of 1 mm over the stent. The 300/150 μm stent reduced the peak wall stress by 70% in the aneurysm and 50% reduction in compliance after embedding. Stage 3 analysis was performed to study the efficacy of stents with struts (thickness/width) 70/70, 180/100 and 300/150 μm after embedding and tissue overgrowth. The adjacent wall stresses were very minimal in stents with 180/100 and 70/70 μm struts after embedding. There is potential for a novel stent method in aortic aneurysm therapy.
authors.affiliation: Professor, Cardiology, Pondicherry Institute of Medical Sciences, Kalathumettupathai street, Kalapet, Pondicherry, India.
authors.forename: Mark C
authors.initials: MC
authors.lastname: Arokiaraj
authors.forename: Gianluca
authors.lastname: De Santis
authors.forename: Matthiew
authors.lastname: De Beule
authors.affiliation: Cardiology Division, Massachusetts General Hospital, Boston, USA.
authors.forename: Igor F
authors.initials: IF
authors.lastname: Palacios
mesh_terms: D001014:Aortic Aneurysm / Q000601:surgery*; D003187:Compliance; D057510:Endovascular Procedures / Q000295:instrumentation*; D020342:Finite Element Analysis; D006801:Humans; D015607:Stents