DESIGN OF AN ORIGAMI STENT GRAFT

Conference item

Percutaneous insertion and improvement of device durability are two of the major challenges facing stent graft designers. This paper presents an innovative design for a self-expanding stent graft that incorporates a NiTi scaffold with a polyhedral oligomeric silsequioxane-poly(carbonate-urea)urethane nanocomposite polymer material, chosen for its excellent biocompatibiliry and superior vascular properties. The principles of deployable structures and origami have been used to develop a folding pattern to minimise the insertion profile of the device. Work conducted to define the folding pattern in the polymer and to design a scaffold that is compatible with the origami design is presented. Finite element analysis is used to investigate the affect the wire diameter and the scaffold geometry has on the peak stresses in the scaffold when folded. An analysis is conducted to characterise and improve the bond strength between NiTi and the nanocomposite polymer. It is shown that a 3-fold increase in bond strength can be achieved by modifying the surface of the NiTi alloy prior to bonding. Copyright © 2008 ASM International® All rights reserved.

Authors: Eaton-Evans, J; You, Z; Darbyshire, A; Bakhshi, R; Seifalian, A

• Publication status: Published
• Host title: SMST-2007: PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SHAPE MEMORY AND SUPERELASTIC TECHNOLOGIES
• Pages: 513-520
• Publication date: 2008-01-01
• DOI: 10.1361/cp2007smst513
• ISBN: 9780871707222