Study of velocity and shear stress distributions in the impeller passages and the volute of a bio-centrifugal ventricular assist device.

Chua LP; Ong KS; Song G

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Study of velocity and shear stress distributions in the impeller passages and the volute of a bio-centrifugal ventricular assist device.

机译：研究叶轮通道中的速度和切应力分布以及生物离心心室辅助设备的蜗壳。

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The velocity fields within the impeller passages of three different impellers of the Kyoto-NTN bio-centrifugal ventricular assist device are measured using laser Doppler velocimetry in this study. The 16 forward-swept-blade impeller has better performance than the 16 straight-blade and 8 backward-swept-blade impellers in terms of smooth flow pattern, and has less high-shear-stress regions in the passages. The flow distributions are found to be similar with those measured by Yu et al. Through-flow characteristics are found in the impeller when the passages open to the biggest volute space. The flow fields in the blade channels of the impeller were found to be axis symmetrical due to the double volute design with the objective of minimizing the imbalance of the radial thrust when the impeller is magnetically suspended. In addition, the high-intensity vortex which was detected by Yu et al. at the discharge channel of the pump is effectively reduced when the end of the splitter plate is modified by increasing the taper ratio from 4 to 20. The new design would reduce the hemolysis of blood due to the high shear rate of the vortex.

机译：在这项研究中，使用激光多普勒测速仪测量了Kyoto-NTN生物离心心室辅助设备的三个不同叶轮的叶轮通道内的速度场。就顺畅的流型而言，前掠式叶轮的16个叶轮比16个直叶片式叶轮和8个后掠式叶轮具有更好的性能，并且通道中的高剪切应力区域更少。发现流量分布与Yu等人测量的流量分布相似。当通道通向最大蜗壳空间时，叶轮具有通流特性。由于双蜗壳设计，发现叶轮叶片通道中的流场是轴对称的，目的是最大程度地减小叶轮磁悬浮时径向推力的不平衡。另外，Yu等人发现了高强度涡旋。通过将锥度比从4增加到20来修改分流板的端部，可以有效地减少泵的排放通道处的压力。由于涡流的高剪切速率，新设计将减少血液的溶血。

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来源
《Artificial Organs》 |2008年第5期|共12页
作者
Chua LP; Ong KS; Song G;
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正文语种 eng
中图分类医用一般科学;外科手术学;
关键词
Stress; Doppler velocimetry; Performance; Pattern; Pump; NOS; 应激;

机译：Stress;Doppler velocimetry;Performance;Pattern;Pump;NOS;应激;

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1. Study of velocity and shear stress distributions in the impeller passages and the volute of a bio-centrifugal ventricular assist device. [J] . Chua LP, Ong KS, Song G Artificial Organs . 2008,第5期

机译：研究叶轮通道中的速度和切应力分布以及生物离心心室辅助设备的蜗壳。
2. Performance study on newly developed impellers for a left ventricular assist device. [J] . Hsu CH The international journal of artificial organs . 2007,第7期

机译：新开发的左心室辅助装置叶轮的性能研究。
3. Flow study on a newly developed impeller for a left ventricular assist device. [J] . Hsu CH Journal of artificial organs: The official journal of the Japanese Society for Artificial Organs . 2003,第2期

机译：左心室辅助装置新开发叶轮的流量研究。
4. GAP FLOW FIELD MEASUREMENTS OF BIO-CENTRIFUGAL VENTRICULAR ASSIST DEVICE USING LASER DOPPLER ANEMOMETER [C] . Leok Poh Chua, Kang Shiu Ong, Simon Ching Man Yu Fluids Engineering Conference . 2003

机译：激光多普勒风速仪测量生物心室辅助装置的间隙流场
5. In vitro flow visualization study within an outlet cannula of a rotary ventricular assist device. [D] . Manning, Keefe Baird. 2001

机译：旋转心室辅助设备出口套管内的体外血流可视化研究。
6. Aspirin Has Limited Ability to Modulate Shear-Mediated Platelet Activation Associated with Elevated Shear Stress of Ventricular Assist Devices [O] . Lorenzo Valerio, Phat L. Tran, Jawaad Sheriff, -1

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Study of velocity and shear stress distributions in the impeller passages and the volute of a bio-centrifugal ventricular assist device.

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