Implantable Centrifugal Pump With Hybrid Magnetic Bearings

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Abstract
Test methods and results of in vitro assessment of a centrifugal pump with a magnetically suspended impeller are provided. in vitro blood tests have been completed with a resulting normalized milligram index of hemolysis (NmlH) of 12.4 ± 4.1, indicating that hemolysis is not a problem. Hydraulic characterization of the system with water has shown that a nominal pumping condition of 6 L/min at 100 mmHg was met at 2,200 rpm. Maximum clinically usable cardiac output is predicted be 10 L/min. The magnetic bearing supported impeller did not contact the housing and was shown to be stable under a variety of pumping conditions. The driving motor efficiency is 75% at the nominal condition. Finally, a description of the clinical version of the pump under development is provided.

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