Araki K, Taenaka Y, Masuzawa T, Tatsumi E, Wakisaka Y, Watari M, Nakatani T, Akagi H, Baba Y, Anai H
Department of Artificial Organs, National Cardiovascular Center Research Institute, Osaka-Suita, Japan.
Artif Organs. 1994 Sep;18(9):669-72. doi: 10.1111/j.1525-1594.1994.tb03397.x.
A compact centrifugal pump, NCVC-1, has an open-type impeller with 6 curved vanes, and it is characterized by no shaft and no seal. A tunnel is placed in the center of the impeller-rotor assembly to irrigate the back space behind the rotor. To evaluate the flow, we performed 3 visualization methods: tracer, oil film, and injection streak line method. The flow, observed by the tracer method in NCVC-1, indicated little turbulence along vanes. A volute chamber proved effective to reduce vortex formation in the outlet. Oil film pattern revealed no flow separation on vanes at 5 L/min. Washout flow behind the rotor is essential to prevent thrombus formation and was shown as inward spiral flow without any stagnation. These data suggested that a combination of visualization techniques was useful to analyze various flow conditions, and the NCVC-1 has excellent flow characteristics with little turbulence and little flow stagnation, which must be beneficial to low hemolysis and high antithrombogenicity.
一种紧凑型离心泵NCVC - 1，具有一个带有6个弯曲叶片的开式叶轮，其特点是无轴无密封。在叶轮 - 转子组件的中心设置了一个通道，用于冲洗转子后面的空间。为了评估流动情况，我们采用了三种可视化方法：示踪法、油膜法和注入条纹线法。在NCVC - 1中用示踪法观察到的流动显示，叶片上几乎没有湍流。蜗壳腔被证明对减少出口处的涡流形成有效。油膜图案显示在5升/分钟时叶片上没有流动分离。转子后面的冲洗流对于防止血栓形成至关重要，并且显示为向内的螺旋流且没有任何停滞。这些数据表明，可视化技术的组合对于分析各种流动条件很有用，并且NCVC - 1具有出色的流动特性，几乎没有湍流和流动停滞，这对于低溶血和高抗血栓形成一定是有益的。
