Key result
When the maglev blood pump was set vertically in pulsatile mode, the levitated impeller contacted the pump casing, and radial fluid force with a 0.4 mm displacement was 2.8 N.
The permanent magnet in the magnetic bearing of the novel maglev blood pump requires enlargement to improve axial attractive force and prevent impeller-casing contact during vertical pulsatile operation.
Impeller contact in vertical pulsatile mode signals axial force limits; leaves open whether magnet enlargement stabilizes future maglev pump designs.
A new novel blood pump with a maglev impeller has been developed to recover cardiac functions. The pump's rotational speed is modulated based on synchronizing with the heart beat in order to increase the coronary flow to recover the patient heart. Levitation stability of radial axes of the pump operated in constant speed mode and pulsatile mode was evaluated with a mock circuit filled with water when the pump is set horizontally and/or vertically. Levitated impeller is contacted with pump casing in the pulsatile mode when the pump is set vertically. Radial fluid force of levitated impeller is estimated by computational fluid dynamics analysis when levitation impeller is displaced 0.0 mm and 0.4 mm toward radial axis. Radial fluid force with an impeller displacement of 0.4 mm is 2.8 N and it is three times greater than that with a displacement of 0.0 mm. The size of permanent magnet in the magnet bearing should be enlarged to improve axial attractive force in order to prevent contact between levitation impeller and pump casing.
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Shimohori et al. (2016) studied Acute heart failure. Heart Beat Synchronous Maglev Blood Pump was evaluated on Levitation stability (radial displacement) and radial fluid force. When the maglev blood pump was set vertically in pulsatile mode, the levitated impeller contacted the pump casing, and radial fluid force with a 0.4 mm displacement was 2.8 N.
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