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首页> 外文期刊>Journal of Biomechanics >A numerical assessment of wall shear stress changes after endovascular stenting
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A numerical assessment of wall shear stress changes after endovascular stenting

机译：血管内支架置入后壁剪切应力变化的数值评估

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This theoreticalumerical study aims at assessing the haemodynamic changes induced by endovascular stenting. By using the classical one-dimensional linear pressure waves theory in elastic vessels, we first show that the modulus of the reflection coefficient induced by an endovascular prosthesis is most likely small since it is proportional to the stent-to-wavelength ratio. As a direct consequence, the wall motion of the elastic (stented) artery can be prescribed a priori and the coupled fluid-structure problem does not have to be solved for assessing the haemodynamic changes due to stenting. Several 2D axisymetric calculations are performed to solve the unsteady incompressible Navier-Stokes equations on moving meshes for different types of (stented) arteries. The numerical results suggest that endovascular stenting increases the systo-diastolic variations of the wall shear stress (by 35% at the middle of the stent, by almost 50% in the proximal transition region). Additional calculations show that over-dilated stents produce less haemodynamic perturbations. Indeed, the increase of the amplitude of the wall shear stress variations over the cardiac cycle is only 10% when the stent radius is equal to the radius of the elastic artery at systole (instead of being equal to the mean artery radius). (c) 2004 Elsevier Ltd. All rights reserved.
机译：这项理论/数值研究旨在评估血管内支架置入引起的血流动力学变化。通过在弹性血管中使用经典的一维线性压力波理论，我们首先表明，由血管内假体引起的反射系数的模量很可能很小，因为它与支架与波长的比例成正比。作为直接的结果，可以事先规定弹性（支架）动脉的壁运动，并且不必解决耦合流体结构问题，以评估由于支架植入引起的血液动力学变化。为了解决不同类型（支架）动脉的运动网格上的不稳定的不可压缩的Navier-Stokes方程，执行了一些2D轴对称计算。数值结果表明，血管内支架置入术会增加壁切应力的收缩舒张期变化（在支架中间增加35％，在近端过渡区域增加近50％）。额外的计算表明，过度扩张的支架产生的血流动力学扰动更少。实际上，当支架半径等于收缩期的弹性动脉半径（而不是等于平均动脉半径）时，整个心脏周期内壁切应力变化幅度的增加仅为10％。 （c）2004 Elsevier Ltd.保留所有权利。

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