An In-Vitro Evaluation of the Bio-Medicus Blood Pump

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Abstract
The Bio-Medicus blood pump was evaluated for possible micro-emboli release and the flow/afterload relationship inherent in any load-sensitive device.A standard extracorporeal circuit was primed with Plasmalyte A. Microemboli transducers with 7.5 MHz lithium niobate crystals were placed proximal and distal to the Bio-Medicus pump. In Phase I of the study, room air was injected proximally at varying pump flow rates with subsequent embolic activity recorded distally. In Phase II, pump afterload was increased to 750 mmHg in 50 mmHg increments while flow rate and RPM were recorded in the automatic modes.Microemboli ranging from 32,000 to 280,000 counts/L. were recorded distally at all flow rates after injecting 0.5 cc. of room air. In the manual mode, flow decreased as afterload increased with no change in RPM. In the automatic mode, the flow rate remained constant with a subsequent 105% increase in RPM with a pump afterload of 650 mmHg.

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