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Journal of Long-Term Effects of Medical Implants

ISSN Print: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2013007769
pages 67-86

Fatigue and/or Failure Phenomena Observed in the Fabric of Stent-Grafts Explanted After Adverse Events

Jing Lin
Key Laboratory of Textile Science and Technology of Ministry of Education and College of Textiles, Donghua University, Shanghai, PR. China
Robert Guidoin
Department of Surgery, Faculty of Medicine, Laval University, Quebec, QC, Canada; Axe Medecine Regeneratrice, Centre de Recherche du CHU, Quebec, QC, Canada
Lu Wang
Key Laboratory of Textile Science and Technology of the Ministry of Education, College of Textile, Donghua University, Shanghai, China
Ze Zhang
Department of Surgery, Faculty of Medicine, Laval University, Quebec, QC, Canada; Axe Medecine Regeneratrice, Centre de Recherche du CHU, Quebec, QC, Canada
Mark Nutley
Division of Vascular Surgery and Department of Diagnostic Imaging, University of Calgary, Peter Lougheed Health Centre (AB), Calgary, Canada
Royston Paynter
INRS, Energie, materiaux et communications, Varennes (QC) Canada
Dangheng Wei
The Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, University of South China, Heng Yang, Hunan Province, China; Departments of Surgery and Radiology, Laval University and Quebec Biomaterials Institute, Canada
Thien How
Department of Clinical Engineering, University of Liverpool, Liverpool UK
Helene Crepeau
Department of Mathematics and Statistics Laval University Quebec QC Canada
Yvan Douville
Departments of Surgery and Radiology, Laval University and Quebec Biomaterials Institute, CHUQ, Quebec
Gregory Samis
Division of Vascular Surgery, University of Calgary, Peter Lougheed Centre, Calgary AB, Canada
Guy Dionne
Departments of Surgery and Radiology, Faculty of Medicine, Laval University, Axe Medecine Regeneratrice, Centre de Recherche, CHU, Quebec, (QC) Canada
Nathalie Gilbert
Departments of Surgery and Radiology, Laval University and Québec Biomaterials Institute, CHUQ, Quebec, QC, Canada

ABSTRACT

In this study, we aimed to investigate changes to the fabric of Talent stent-grafts following implantation of aortic endografts and to determine the possible causes of fatigue and/or failure of the grafts. Six devices were explanted at reoperation (N=5) and autopsy (N=1). Selected segments were assessed nondestructively by gross observation and destructively by analyzing textile characteristics and chemical properties. All of the devices showed a 4/4 twill woven fabric of monofilament polyester. These devices, explanted at reoperation and autopsy, presented different levels of fatigue and/or failure. Numerous holes were found in the fabric of two devices. The minor damage caused by the passage of the sutures through the weave to fasten the Nitinol wires did not progress significantly over time. The sutures remained relatively intact, except for some distortions. The main failure mode was the abrasion of the yarns at the apices of adjacent Nitinol stents. In two devices, this abrasion resulted in fraying of the yarns and holes in the fabric tubes. This short series of explanted devices provides evidence of damage to polyester fabric used in aortic endografts and raises questions regarding their resistance to abrasion and the risk of endoleak associated with monofilament fabric yarn.