Flow visualization in the outflow cannula of an axial blood pump.
The properties of blood flow in the outflow cannula of an axial blood pump play a critical role in potential thrombus formation and vascular injury. In this study, an in vitro flow visualization technique using particle image velocimetry (PIV) was applied to investigate the flow characteristics in the outflow cannula of a FW-2 model axial pump. The two-dimensional (2-D) flow field in the axial central section and the three-dimensional (3-D) flow field in the whole outflow cannula were examined with the PIV system. Tests were carried out with a blood-mimic working fluid in the axial pump at a rotational speed of 8500 ± 20 rpm with a flow rate of 5 L/min. The velocity distribution in the outflow cannula was analyzed to evaluate the flow characteristics. There was no backflow or stagnant flow in the tested area, while the flow velocity rapidly increased outside the boundary layer. A spiral flow was observed near the boundary layer, but this was worn off within the tested area. Based on the results, hemolysis and thrombus formation in the cannula, and injury to aortic endothelium are unlikely to occur due to spiral flow.
['Liu|Guangmao|G|', 'Zhang|Yan|Y|', 'Chen|Haibo|H|', 'Sun|Hansong|H|', 'Zhou|Jianye|J|', 'Hu|Shengshou|S|']
D001011:Aorta D001698:Biomedical Engineering D001783:Blood Flow Velocity D002138:Calibration D057785:Catheters D004730:Endothelium, Vascular D004867:Equipment Design D006333:Heart Failure D006353:Heart-Assist Devices D006461:Hemolysis D006801:Humans D008955:Models, Cardiovascular D012212:Rheology D012984:Software D013927:Thrombosis D014783:Viscosity
outflow cannula axial blood pump thrombus formation particle image velocimetry