前导叶对轴流泵式心脏辅助装置流体力学特性的影响及改进意义

目的：通过测试近年来研制的两类微型轴流血泵，观察前导叶对轴流泵性能的影响。方法：应用体外模拟循环装置，测定并比较设置或不设置前导叶的两型轴流泵的流体力学特性差异。结果：两型轴流泵的流量输出在13．332kPa后负荷条件下均可达到5L/min流量，满足左心辅助的要求；两型血泵均表现出类似的前、后负荷反应曲线，表明在观测的压力流量范围内，前导叶的设置对该类微型轴流血泵的流体力学特性没有明显影响。结论：在微型轴流泵的结构设计中，可以去除前导叶。以改善血泵的血液相容性。

Affection of guiding vane on axial flow pump heart assist device and its clinical relevancy

Objective To observe the response of the guiding vane to axial flow pump by testing two types oi rmnlature axial flow pump, which have been developed by our group in recent years. Methods Two types of axial flow pump were tested in a mock circulation apparatus. Results The outputs of the two types of miniature axial flow pump all attain 5L/min against the pressure of 13.332kPa, which is enough for left ventricular assistance. The outputs are similarly related to their pre-load and after-load pressure. In this study, the guiding vane does not produce a significant affection on the hydrodynamic characteristic of the axial follow, pump. Conclusion The guiding vane may be neglected in the design to improve the blood compatibility of a axial flow pump heart assist device.