Impact of Gap Size and Groove Design of Hydrodynamic Bearing on Plasma Skimming Effect for Use in Rotary Blood Pump.
Impact of Gap Size and Groove Design of Hydrodynamic Bearing on Plasma Skimming Effect for Use in Rotary Blood Pump.
复制标题
液体动压轴承的间隙尺寸和凹槽设计对旋转血泵等离子撇取效果的影响。
DOI：
10.1007/s10047-021-01308-x
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发表时间：
2021
影响因子：
1.3
通讯作者：
Wataru Hijikata
中科院分区：
文献类型：
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作者：
Ming Jiang;Daisuke Sakota;Ryo Kosaka;Wataru Hijikata
血浆撇渣可以将红细胞从旋转血泵中的流体动力轴承形成的间隙中的高剪切区域中排除。我们研究了间隙尺寸和凹槽设计对等离子体撇取效率的影响。螺旋槽轴承 (SGB) 安装在专门设计的测试装置中，用于使用人体血液进行体外实验。在流量为 150 ml/min 且转子速度为 2400 rpm 时，测得轴承脊与转子表面之间的间隙为 17–26 µm。设计了三种不同样式的 SGB（SGB-0、SGB-30 和 SGB-60），具有不同程度的圆周分量。将高速摄像机测量的血细胞比容与回路中的血细胞比容进行比较，并在血细胞比容为20%、25%和30%时评估三种轴承模式的等离子撇取效率。 SGB-60 具有最强的圆周分量，提供了最佳的等离子撇渣效率。当间隙尺寸小于20 µm时，轴承和转子表面之间的间隙中的红细胞显着减少，效率变得高于90%。间隙尺寸对于产生显着的等离子体撇取具有最强的影响。通过优化轴承间隙尺寸和凹槽设计，可以显着提高等离子撇渣效率，这有助于进一步开发 SGB 用于旋转式血泵等应用。
Plasma skimming can exclude red blood cells from high shear regions in the gaps formed by hydrodynamic bearings in rotary blood pumps. We investigated the effect of the gap size and groove design on the plasma skimming efficiency. Spiral groove bearings (SGBs) were installed into a specially designed test rig for in vitro experiments performed using human blood. The measured gap between the ridges of the bearing and the rotor surface was 17–26 µm at a flow rate of 150 ml/min and a rotor speed of 2400 rpm. Three different patterns of SGBs were designed (SGB-0, SGB-30, and SGB-60) with various degrees of the circumferential component. The hematocrit measured by a high-speed camera was compared with the hematocrit in the circuit, and the plasma skimming efficiency for the three bearing patterns was evaluated at hematocrits of 20%, 25%, and 30%. SGB-60, which had the strongest circumferential component, provided the best plasma skimming efficiency. When the gap size was less than 20 µm, the red blood cells in the gaps between the ridges of the bearing and rotor surface reduced significantly and the efficiency became higher than 90%. The gap size had the strongest effect on producing a significant plasma skimming. The plasma skimming efficiency can be significantly improved by optimizing the bearing gap size and groove design, which facilitates the further development of SGBs for use in applications such as rotary blood pumps.