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Power Consumption of Rotary Blood Pumps: Pulsatile Versus Constant‐Speed Mode
Author(s) -
Pirbodaghi Tohid,
Cotter Chris,
Bourque Kevin
Publication year - 2014
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/aor.12323
Subject(s) - pulsatile flow , waveform , peristaltic pump , power (physics) , materials science , control theory (sociology) , biomedical engineering , computer science , voltage , engineering , cardiology , mechanical engineering , electrical engineering , medicine , physics , control (management) , artificial intelligence , quantum mechanics
We investigated the power consumption of a H eart M ate III rotary blood pump based on in vitro experiments performed in a cardiovascular simulator. To create artificial‐pulse mode, we modulated the pump speed by decreasing the mean speed by 2000 rpm for 200 ms and then increasing speed by 4000 rpm (mean speeds plus 2000 rpm) for another 200 ms, creating a square waveform shape. The H eart M ate III was connected to a cardiovascular simulator consisting of a hydraulic pump system to simulate left ventricle pumping action, arterial and venous compliance chambers, and an adjustable valve for peripheral resistance to facilitate the desired aortic pressure. The simulator operated based on Suga's elastance model to mimic the Starling response of the heart, thereby reproducing physiological blood flow and pressure conditions. We measured the instantaneous total electrical current and voltage of the pump to evaluate its power consumption. The aim was to answer these fundamental questions: (i) How does pump speed modulation affect pump power consumption? (ii) How does the power consumption vary in relation to external pulsatile flow? The results indicate that speed modulation and external pulsatile flow both moderately increase the power consumption. Increasing the pump speed reduces the impact of external pulsatile flow.