1.上海理工大学 医疗器械与食品学院;2.上海市东医院 危重症医学科
1.School of Medical Instrument and Food Engineering,University of Shanghai for Sci-Tech,shanghai;2.Department of Critical Care Medicine,Shanghai East City Hospital,shanghai
目的 应用计算流体动力学方法( computational fluid dynamics，CFD)对电磁驱动搏动式灌注血泵流场进行仿真分析，通过改进泵头结构来改善血液在血泵的流动状态，从而提升其抗溶血性能。方法 应用Fluent 17.0分析泵头结构的变化对泵内流场的影响，通过血液流入和流出的四次仿真实验，分析内部液体的流线分布、中轴面上的湍流动能分布、血液流经泵头的压力损失和模型表面受到的切应力。结果 在四次实验中，泵头入口与出口管路对称且与对称轴的夹角α为30°时，液体流线无明显紊乱，湍流程度较低；实验一中压力损失为376.8Pa，数值最小；实验一和二中的最大切应力为258.6Pa和302.8Pa，符合生物力学性能要求。选择夹角α为30°的模型为该电磁驱动搏动式灌注血泵的泵头结构，并通过3D打印技术进行制作。结论 经过对泵头的优化分析，血泵溶血性能得到改善，该结果可以运用到新型电磁驱动搏动式灌注血泵的设计与实验中。
Objective To calculate the flow field of electromagnetically driven pulsating perfusion blood pump by computational fluid dynamics (CFD), improve the flow state of blood in blood pump by improving the structure of pump head, and improve its anti-hemolytic performance. Methods Fluent 17.0 was used to analyze the influence of the change of pump head structure on the flow field in the pump. Four simulation experiments were carried out to analyze the streamline distribution of the internal liquid, the turbulent flow energy distribution on the axis of the model, the pressure loss of blood flowing through the pump head and the shear stress on the surface of the model. Results In the four experiments, when the angle between the inlet and outlet of the pump head is symmetrical and the angle between the pump head and the symmetrical axis is 30 degrees, there is no obvious disturbance in the flow line and the turbulence degree is low. In the first experiment, the pressure loss is 376.8 Pa, with the minimum value. The maximum shear stress in the first and second experiments is 258.6 Pa and 302.8 Pa, which meet the requirements of biomechanical properties. The pump head structure of the pulsating blood pump driven by electromagnetic force was selected as the model with angle of 30 and was fabricated by 3D printing technology. Conclusion After optimization of the pump head, the hemolysis performance of the blood pump is improved. This result can be applied to the design and experiment of a new electromagnetic drive pulse perfusion blood pump.