Abstract
Formations of clots were found inside the hydrodynamic bearings of the left ventricular assisted devices (LVADs) and caused tremendous risks to the long-term use of these devices. For the hydrodynamic bearings used in the LVAD, not only the lubrication status but also the motion of the blood cells in the bearing will take great effect on the performance of the device. Based on the analysis of the hydrodynamic pressures distribution and the flowing trajectory of red blood cells in the lubrication film, the bearing is designed in a region where enough hydrodynamic pressure is generated to float the rotor to reduce the wear, and the entrainment of red blood cells in the gap of the bearing can be prevented to avoid the formation of clots.
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This work is supported by the National Key R & D Program of China (2017YFC0111105), and the funding of State Key Laboratory of Tribology, China (SKLT2018B03).
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Xiaobing ZHENG. She received her bachelor degree in biological science from Hebei University, Hebei, China, in 2016. Now, she is a master student majoring in biochemistry and molecular biology at State Key Laboratory of Cardiovascular Disease in Peking Union Medical College, Beijing, China. Her research areas are biomaterials and artificial organs.
Yongjian LI. He received his Ph.D. degree in mechanical engineering from Tsinghua University, China, in 2009. He joined the Department of Mechanical Engineering at Tsinghua University from 2011. His current position is an assistant professor. His research areas cover the tribology in seals and bearings, transport phenomena and interfacial behaviors in microfluidics and bio-chips.
Jianye ZHOU. He received his master degree in biomedical engineering from Peking Union Medical College in 1995. He joined Fu Wai hospital, Chinese Academy of Medical Sciences from 1998 as a scientific researcher. His current position is a professor and the deputy chief of the Laboratory of Cardiovascular Regenerative Medicine. His research area covers development of implantable devices, anti-calcification strategies, and cardiovascular tissue engineering.
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Zheng, X., Li, Y., Chen, H. et al. Investigation on hydrodynamic lubrication of bearings in a left ventricular assisted device. Friction 8, 746–754 (2020). https://doi.org/10.1007/s40544-019-0300-8
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DOI: https://doi.org/10.1007/s40544-019-0300-8