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Design of a Small Centrifugal Blood Pump With Magnetic Bearings
Author(s) -
Jahanmir Said,
Hunsberger Andrew Z.,
Ren Zhaohui,
Heshmat Hooshang,
Heshmat Crystal,
Tomaszewski Michael J.,
Walton James F.
Publication year - 2009
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2009.00883.x
Subject(s) - magnetic bearing , rotor (electric) , bearing (navigation) , stator , finite element method , centrifugal pump , mechanical engineering , stiffness , fluid bearing , axial flow pump , engineering , control theory (sociology) , hydraulic motor , magnetic levitation , axial compressor , mechanics , impeller , hydraulic pump , structural engineering , computer science , physics , magnet , lubrication , reciprocating pump , control (management) , artificial intelligence , gas compressor
Design of a blood pump with a magnetically levitated rotor requires rigorous evaluation of the magnetic bearing and motor requirements and analysis of rotor dynamics and hydraulic performance with attention to hemolysis and thrombosis potential. Given the desired geometric dimensions, the required operating speed, flow in both the main and wash flow regions, and magnetic bearing performance, one of several design approaches was selected for a new prototype. Based on the estimated operating speed and clearance between the rotor and stator, the motor characteristics and dimensions were estimated. The motor stiffness values were calculated and used along with the hydraulic loading due to the fluid motion to determine the best design for the axial and radial magnetic bearings. Radial and axial stability of the left ventricular assist device prototype was verified using finite element rotor dynamic analysis. The analysis indicated that the rotor could be completely levitated and spun to the desired operating speed with low power loss and no mechanical contact. In vitro experiments with a mock loop test setup were performed to evaluate the performance of the new blood pump prototype.