Schajer G S, Green S I, Davis A P, Hsiang Y N
Department of Mechanical Engineering, University of British Columbia, Vancouver, Canada.
J Biomech Eng. 1996 Nov;118(4):445-51. doi: 10.1115/1.2796030.
This study illustrates how the highly nonlinear elastic behavior of artery wall material can cause unusual structural characteristics that do not occur with a linear-elastic material. An example mathematical model of an end-to-end anastomosis successfully predicts the experimentally observed area of elevated elastic compliance, called the "Para-anastomotic Hypercompliant Zone" (PHZ). The elastic hypercompliance is shown to occur because the anastomosis locally restricts the arterial diameter, thus forcing the adjacent material to remain in a lower strain, and correspondingly a lower stiffness, part of its non-linear stress-strain curve. Elevated elastic compliance can be avoided by locally matching both the arterial diameter and the elastic compliance within the physiological pressure range.
本研究说明了动脉壁材料的高度非线性弹性行为如何导致线性弹性材料不会出现的异常结构特征。一个端到端吻合的示例数学模型成功预测了实验观察到的弹性顺应性升高区域，即“吻合口旁高顺应区”（PHZ）。结果表明，弹性高顺应性的出现是因为吻合口局部限制了动脉直径，从而迫使相邻材料保持在较低应变状态，相应地处于其非线性应力-应变曲线中较低刚度的部分。通过在生理压力范围内局部匹配动脉直径和弹性顺应性，可以避免弹性顺应性升高。
