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The effect of stent graft oversizing on radial forces considering nitinol wire behavior and vessel characteristics

Der Effekt der Stentgraft-Überbemaßung auf die Radialkräfte unter Berücksichtigung des Nitinoldraht-Verhaltens und der Gefäßeigenschaften
 
: Senf, Björn; Sachsen, Sandra von; Neugebauer, Reimund; Drossel, Welf-Guntram; Florek, Hans-Joachim; Mohr, Friedrich Wilhelm; Etz, Christian Daniel

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Medical engineering & physics 36 (2014), No.11, pp.1480-1486
ISSN: 1350-4533
ISSN: 1873-4030
World Congress on Bioengineering <6, 2013, Peking>
English
Journal Article, Conference Paper
Fraunhofer IWU ()
surgical planning; finite element analysis; stent graft oversizing; endovascular surgery

Abstract
Stent graft fixation in the vessel affects the success of endovascular aneurysm repair. Thereby the radial forces of the stent, which are dependent on several factors, play a significant role. In the presented work, a finite element sensitivity study was performed. The radial forces are 29% lower when using the hyperelastic approach for the vessel compared with linear elastic assumptions. Without the linear elastic modeled plaque, the difference increases to 35%. Modeling plaque with linear elastic material approach results in 8% higher forces than with a hyperelastic characteristic. The significant differences resulting from the investigated simplifications of the material lead to the conclusion that it is important to apply an anisotropic nonlinear approach for the vessel. The oversizing study shows that radial forces increase by 64% (0.54 N) when raising the oversize from 10 to 22%, and no further increase in force can be observed beyond these values (vessel diameter D = 12 mm). Starting from an oversize of 24%, the radial force steadily decreases. The findings of the investigation show that besides the oversizing the material properties, the ring design and the vessel characteristics have an influence on radial forces.

: http://publica.fraunhofer.de/documents/N-316050.html