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Journal of Long-Term Effects of Medical Implants
SJR: 0.332 SNIP: 0.491 CiteScore™: 0.89

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

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2013007780
pages 45-59

Long-Term Resistance to Fracture and/or Corrosion of the Nitinol Wires of the Talent Stent-Graft: Observations From a Series of Explanted Devices

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
Royston Paynter
INRS, Energie, materiaux et communications, Varennes (QC) Canada
Thien How
Department of Clinical Engineering, University of Liverpool, Liverpool UK
Mark Nutley
Division of Vascular Surgery and Department of Diagnostic Imaging, University of Calgary, Peter Lougheed Health Centre (AB), Calgary, 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
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

The biodurability of the Nitinol wires used in stent-grafts retrieved from reoperations and autopsy was analyzed to assess the possible causes of fracture and/or corrosion of the stents. The Nitinol wires of six explanted devices presented a corrosion-free surface after in vivo service. The drawing lines in the control wires were still present, but neither burrs nor flakes were observed. Pits and crevices were rare, but some shallow ones were present. Some abrasions of the surfaces of the Nitinol wires were also observed. The chemical composition of the explanted devices showed the presence of organic contamination that covered the thick layer of titanium oxide before reaching the Nitinol itself. The durability of the Nitinol employed in the manufacture of the Talent stent-grafts was confirmed; the results of this study show the Nitinol to be resistant to corrosion. We have also concluded that the fractures of the Nitinol wires in two devices were unique adverse incidents caused by compression and bending related to the sharp angle of the Nitinol wires.