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Open AccessArticle

An in Vitro Twist Fatigue Test of Fabric Stent-Grafts Supported by Z-Stents vs. Ringed Stents

Key Laboratory of Textile Science and Technology of Ministry of Education and College of Textiles, Donghua University, Shanghai 201620, China
Department of Surgery, Laval University and Axe of Regenerative Medicine, Centre de Recherche du CHU, Québec, QC G1V 0A6, Canada
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
Division of Vascular and Endovascular Surgery and Department of Diagnosis Imaging, Peter Lougheed Health Centre and University of Calgary, Calgary, AB T2N 1N4, Canada
Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2016, 9(2), 113;
Received: 13 December 2015 / Revised: 27 January 2016 / Accepted: 3 February 2016 / Published: 16 February 2016
(This article belongs to the Section Structure Analysis and Characterization)
Whereas buckling can cause type III endoleaks, long-term twisting of a stent-graft was investigated here as a mechanism leading to type V endoleak or endotension. Two experimental device designs supported with Z-stents having strut angles of 35° or 45° were compared to a ringed control under accelerated twisting. Damage to each device was assessed and compared after different durations of twisting, with focus on damage that may allow leakage. Stent-grafts with 35° Z-stents had the most severe distortion and damage to the graft fabric. The 45° Z-stents caused less fabric damage. However, consistent stretching was still seen around the holes for sutures, which attach the stents to the graft fabric. Larger holes may become channels for fluid percolation through the wall. The ringed stent-graft had the least damage observed. Stent apexes with sharp angles appear to be responsible for major damage to the fabrics. Device manufacturers should consider stent apex angle when designing stent-grafts, and ensure their devices are resistant to twisting. View Full-Text
Keywords: stent-graft; Z-stents; ringed stents; twisting; endotension stent-graft; Z-stents; ringed stents; twisting; endotension
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Lin, J.; Guidoin, R.; Du, J.; Wang, L.; Douglas, G.; Zhu, D.; Nutley, M.; Perron, L.; Zhang, Z.; Douville, Y. An in Vitro Twist Fatigue Test of Fabric Stent-Grafts Supported by Z-Stents vs. Ringed Stents. Materials 2016, 9, 113.

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