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Titolo:
Corroded nitinol wires in explanted aortic endografts: An important mechanism of failure?
Autore:
Heintz, C; Riepe, G; Birken, L; Kaiser, E; Chakfe, N; Morlock, M; Delling, G; Imig, H;
Indirizzi:
Gen Hosp Hamburg Harburg, Dept Gen Vasc & Thorac Surg, D-21075 Hamburg, Germany Gen Hosp Hamburg Harburg Hamburg Germany D-21075 -21075 Hamburg, Germany Tech Univ Hamburg Harburg, Biomech Sect, D-2100 Hamburg, Germany Tech UnivHamburg Harburg Hamburg Germany D-2100 D-2100 Hamburg, Germany Univ Hosp Eppendorf, Dept Bone Pathol, Hamburg, Germany Univ Hosp Eppendorf Hamburg Germany Dept Bone Pathol, Hamburg, Germany Univ Hosp Eppendorf, Ctr Biomech, Hamburg, Germany Univ Hosp Eppendorf Hamburg Germany dorf, Ctr Biomech, Hamburg, Germany Hop Univ Strasbourg, Dept Cardiovasc Surg, Strasbourg, France Hop Univ Strasbourg Strasbourg France rdiovasc Surg, Strasbourg, France
Titolo Testata:
JOURNAL OF ENDOVASCULAR THERAPY
fascicolo: 3, volume: 8, anno: 2001,
pagine: 248 - 253
SICI:
1526-6028(200106)8:3<248:CNWIEA>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHAPE-MEMORY; CORROSION BEHAVIOR; GRAFTS; BIOCOMPATIBILITY; ALLOYS;
Keywords:
endograft; material fatigue; pitting corrosion; wire fracture; Stentor;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Heintz, C Gen Hosp Hamburg Harburg, Dept Gen Vasc & Thorac Surg, Eissendorfer Pferdeweg 52, D-21075 Hamburg, Germany Gen Hosp Hamburg Harburg Eissendorfer Pferdeweg 52 Hamburg Germany D-21075
Citazione:
C. Heintz et al., "Corroded nitinol wires in explanted aortic endografts: An important mechanism of failure?", J ENDOVAS T, 8(3), 2001, pp. 248-253

Abstract

Purpose: To analyze surface alterations and fractures observed in the nitinol stent wires of explanted endovascular grafts used for treatment of abdominal aortic aneurysm. Methods: Twenty-one explanted Stentor devices and 1 Cragg stent were received from investigators in Germany and France. After macroscopy and photography, the explants were cleaned and the polyester coating removed. The framewas examined completely by stereomicroscopy, and irregularities were assayed by scanning electron microscopy and energy dispersive x-ray analysis (EDAX). The observed alterations were classified according to stereomicroscopic and electron microscopic morphology. Results: The mean implantation interval for the endografts was 29.1 +/- 13.2 months (range 5-46). All examined explants, even those retrieved after only a few months in situ, showed pitlike surface damage 10-25 mum in diameter. Larger, irregularly shaped surface alterations were observed in similarto 70% of the explants. Older explants (age >32 months) presented vast regions of decay, with bending of the wire and stress cracks in some areas. EDAX examination revealed decreased nickel concentration in the corroded regions. Conclusions: Corrosion of the nitinol wire in endovascular grafts is confirmed. Presumably, the observed pitting and irregularly shaped corrosion defects are the precursors of material failure. They weaken the thin wire, which leads to stress cracks and eventually fracture of the stent wire under circulatory pulsation. Cell-induced electrochemical corrosion and active cellular destruction of surfaces are well-known mechanisms that must be investigated for their possible roles in the corrosion of stent metals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 04:05:23