Yamane Takashi, Kodama Takayuki, Nishida Masahiro, Maruyama Osamu, Yamamoto Yoshiro, Shinohara Toshiyuki, Motomura Tadashi, Nosé Yukihiko
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan.
Artif Organs. 2006 Jan;30(1):70-3. doi: 10.1111/j.1525-1594.2006.00155.x.
A centrifugal blood pump with a double pivot impeller and an eccentric inlet port is being developed as an implantable artificial heart by the Baylor College of Medicine and Miwatec Co. Ltd. Flow visualization measurements were conducted to compare the flow around the pivot for two impeller operational modes: the top and the bottom contact modes. In the top contact mode, one-way flow in the pivot gap due to the eccentric vortex was observed, and sufficient wall shear rate to prevent thrombus formation was attained around the bottom pivot for over 1,400 rpm. Computational fluid dynamic analyses confirmed that the causes of the eccentric vortex were the inlet eccentricity and the pressure imbalance in the volute.
贝勒医学院和Miwatec有限公司正在研发一种带有双枢轴叶轮和偏心入口的离心血泵，作为可植入式人工心脏。进行了流动可视化测量，以比较两种叶轮运行模式（顶部和底部接触模式）下枢轴周围的流动情况。在顶部接触模式下，观察到由于偏心涡旋导致枢轴间隙内的单向流动，并且在底部枢轴周围达到了足以防止血栓形成的壁面剪切速率，转速超过1400转/分钟。计算流体动力学分析证实，偏心涡旋的原因是入口偏心和蜗壳内的压力不平衡。
