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Title: A computational study of crimping and expansion of bioresorbable polymeric stents
Authors: Qiu, Tianyang
Song, Mo
Zhao, Liguo
Keywords: Bioresorbable polymeric stents
Finite element
Crimping
Expansion
U-bends
Recoiling
Rate effect
Issue Date: 2017
Publisher: © The Author(s) 2017. This article is published with open access at Springerlink.com
Citation: QIU, T., SONG, M. and ZHAO, L., 2017. A computational study of crimping and expansion of bioresorbable polymeric stents. Mechanics of Time-Dependent Materials, https://doi.org/10.1007/s11043-017-9371-y
Abstract: This paper studied the mechanical performance of four bioresorbable PLLA stents, i.e., Absorb, Elixir, Igaki-Tamai and RevaMedical, during crimping and expansion using the finite element method. Abaqus CAE was used to create the geometrical models for the four stents. A tri-folded balloon was created using NX software. For the stents, elastic-plastic behaviour was used, with hardening implemented by considering the increase of yield stress with the plastic strain. The tri-folded balloon was treated as linear elastic. To simulate the crimping of stents, a set of 12 rigid plates were generated around the stents with a radially enforced displacement. During crimping, the stents were compressed from a diameter of 3 mm to 1.2 mm, with the maximum stress developed at both inner and outer sides of the U-bends. During expansion, the stent inner diameter increased to 3 mm at the peak pressure and then recoiled to different final diameters after balloon deflation due to different stent designs. The maximum stress was found again at the U-bends of stents. Diameter change, recoiling effect and radial strength/stiffness were also compared for the four stents to assess the effect of design variation on stent performance. The effect of loading rate on stent deformation was also simulated by considering the time-dependent plastic behaviour of polymeric material.
Description: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Sponsor: LGZ acknowledge the support from the British Heart Foundation (Grant number: FS/15/21/31424; Title: Towards controlling the mechanical performance of polymeric bioresorbable vascular scaffold during biodegradation) and the Royal Society of UK (Grant number: IE160066; Title: Evaluating the Performance of Additively Manufactured Endovascular Scaffolds). The research leading to these results also received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. PIRSES-GA-2013-610547 TAMER.
Version: Published
DOI: 10.1007/s11043-017-9371-y
URI: https://dspace.lboro.ac.uk/2134/27083
Publisher Link: https://doi.org/10.1007/s11043-017-9371-y
ISSN: 1385-2000
Appears in Collections:Published Articles (Materials)
Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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