A three-dimensional finite element model for arterial clamping
A three-dimensional finite element model for arterial clamping
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DOI：
10.1115/1.1485284
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发表时间：
2002-08-01
影响因子：
1.7
通讯作者：
Holzapfel, GA
中科院分区：
文献类型：
--
作者：
Gasser, TC;Schulze-Bauer, CAJ;Holzapfel, GA
夹闭引起的动脉壁损伤可能决定外科手术的结果。因此，研究潜在的机械效应是很重要的。我们提出了一个三维有限元模型，它允许研究动脉夹住时动脉的机械响应--被视为两层管。文中还考虑了与动脉无负荷构型有关的重要残余应力。特别是对夹持动脉的变形过程及其应力分布进行了有限元分析。在夹闭区域内，发现了一个轴向拉伸峰值应力区，这可能会导致内膜和中膜损伤。这是一种额外的损伤机制，它明显不同于通常认为的由于夹具的钳口之间的压缩而发生的壁损伤。所提出的数值模型提供了对夹紧过程的机制和相关的损伤机制的基本见解。它允许对虚拟夹闭的动脉进行详细的参数研究，这是其他方法无法完成的。这种方法有可能为某些类型的动脉确定最合适的夹子，并指导最佳夹子的设计。
Clamp induced injuries of the arterial wall may determine the outcome of surgical procedures. Thus, it is important to investigate the underlying mechanical effects. We present a three-dimensional finite element model, which allows the study of the mechanical response of an artery-treated as a two-layer tube-during arterial clamping. The important residual stresses, which are associated with the load free configuration of the artery, are also considered. In particular, the finite element analysis of the deformation process of a clamped artery and the associated stress distribution is presented. Within the clamping area a zone of axial tensile peak-stresses was identified, which (may) cause intimal and medial injury. This is an additional injury mechanism, which clearly differs from the commonly assumed wall damage occurring due to compression between the jaws of the clamp. The proposed numerical model provides essential insights into the mechanics of the clamping procedure and the associated injury mechanisms. It allows detailed parameter studies on a virtual clamped artery, which can not be performed with other methodologies. This approach has the potential to identify the most appropriate clamps for certain types of arteries and to guide optimal clamp design.