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Friction 2020, 8(4): 746-754 https://doi.org/10.1007/s40544-019-0300-8
Research Article | Open Access | Issue | Published: 19 July 2019

Investigation on hydrodynamic lubrication of bearings in a left ventricular assisted device

Show Author's Information Xiaobing ZHENG1,  Yongjian LI2( ),  Haosheng CHEN2,  Shengshou HU1,  Jianye ZHOU1( )
State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
Keywords:
hydrodynamic lubrication, journal bearing, left ventricular assisted device, clot
Cite this article:
ZHENG X, LI Y, CHEN H, et al. Investigation on hydrodynamic lubrication of bearings in a left ventricular assisted device. Friction, 2020, 8(4): 746-754. https://doi.org/10.1007/s40544-019-0300-8
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Abstract Full text About this article

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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About this article

Investigation on hydrodynamic lubrication of bearings in a left ventricular assisted device

Show Author's information Xiaobing ZHENG1, Yongjian LI2( ), Haosheng CHEN2, Shengshou HU1, Jianye ZHOU1( )
State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

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.

Keywords: hydrodynamic lubrication, journal bearing, left ventricular assisted device, clot

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Publication history
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Acknowledgements
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Publication history

Received: 22 October 2018
Revised: 20 March 2019
Accepted: 08 May 2019
Published: 19 July 2019
Issue date: August 2020

Copyright

© The author(s) 2019

Acknowledgements

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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