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首页> 外文期刊>Medical engineering & physics. >The effect of stent graft oversizing on radial forces considering nitinol wire behavior and vessel characteristics.
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The effect of stent graft oversizing on radial forces considering nitinol wire behavior and vessel characteristics.

机译：考虑到镍钛诺线的行为和血管特性，支架移植物尺寸过大对径向力的影响。

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摘要

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% (0.54N) when raising the oversize from 10 to 22%, and no further increase in force can be observed beyond these values (vessel diameter D=12mm). 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.
机译：支架移植物在血管中的固定影响血管内动脉瘤修复的成功。因此，取决于几个因素的支架的径向力起着重要的作用。在提出的工作中，进行了有限元敏感性研究。与线性弹性假设相比，使用超弹性方法对血管进行径向力降低29％。如果没有线性弹性建模板，差异将增加到35％。使用线性弹性材料方法对牙菌斑进行建模所产生的力要比具有超弹性特征的菌斑高8％。由研究的材料简化导致的显着差异得出结论，对容器应用各向异性非线性方法很重要。尺寸过大的研究表明，将尺寸从10％增加到22％时，径向力会增加64％（0.54N），并且超出这些值（容器直径D = 12mm）时，看不到力的进一步增加。从24％的过大尺寸开始，径向力会逐渐减小。调查结果表明，除了材料尺寸过大以外，环的设计和容器的特性还对径向力产生影响。

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