In this work, we investigated the influence of the bifurcation geometry of the iliac artery on the propagation properties of the pulse wave, and applied software to establish the straight bifurcation and curved bifurcation bi-directional fluid-solid coupling finite element analysis models based on the iliac artery, and compared and analyzed the influence of the bifurcation angle of the blood vessel on the propagation characteristics of the pulse wave. It was found that the bifurcation geometry had a significant effect on the pulse wave propagation in the iliac arteries, and the pressure and velocity pulse wave amplitudes predicted by these two models had a good agreement with that before the vessel bifurcation in a cardiac cycle. The curvilinear bifurcation model predicted the pulse wave amplitude to be lower and the pressure drop to be smaller after the bifurcation, which was more in line with the actual situation of the human body. In addition, the bifurcation point is accompanied by the stress concentration phenomenon in the vessel wall, and there is a transient increase in the velocity pulse waveform amplitude, which was consistent with the fact that the bifurcation site is prone to phenomena such as arterial stenosis and hardening. The preliminary results of this paper will provide some reference for the use of pulse waveforms in the diagnosis of arterial diseases.
本文研究髂动脉分叉几何特性对脉搏波传播特性的影响，应用多物理场分析软件，分别建立了基于髂动脉的直管分叉和曲管分叉流-固双向耦合有限元分析模型，对比分析了血管分叉角度对脉搏波传播特性的影响。研究发现，分叉几何特性对髂动脉脉搏波传播有明显影响，在一个心动周期内，这两种模型预测的压力脉搏波和速度脉搏波幅值在血管分叉前一致度较高；分叉后，曲管分叉模型预测的脉搏波幅值较低、压降小，更符合人体实际情况。另外，分叉点处伴随着血管壁的应力集中现象，速度脉搏波幅值出现瞬时增加，这与分叉部位容易出现动脉狭窄和硬化等现象相一致。本文的初步研究结果将为脉搏波形用于动脉疾病的诊断提供一定的参考。.
Keywords: Fluid-solid coupling analysis; Numerical simulation; Pressure pulse wave; Vascular bifurcation; Velocity pulse wave.