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Motor Feedback Physiological Control for a Continuous Flow Ventricular Assist Device
Author(s) -
T.P. Waters,
Paul E. Allaire,
Tao Gao,
Milton Adams,
Gill B. Bearnson,
Ning Wei,
E. Hilton,
M. Baloh,
Don B. Olsen,
Pratap S. Khanwilkar
Publication year - 1999
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 - 10.1046/j.1525-1594.1999.06386.x
Subject(s) - control theory (sociology) , controller (irrigation) , computer science , circulatory system , control system , ventricular assist device , control engineering , differential pressure , flow (mathematics) , engineering , control (management) , medicine , physics , cardiology , artificial intelligence , mechanics , electrical engineering , heart failure , agronomy , biology
The response of a continuous flow magnetic bearing supported ventricular assist device, the CFVAD3 (CF3) to human physiologic pressure and flow needs is varied by adjustment of the motor speed. This paper discusses a model of the automatic feedback controller designed to develop the required pump performance. The major human circulatory, mechanical, and electrical systems were evaluated using experimental data from the CF3 and linearized models developed. An open‐loop model of the human circulatory system was constructed with a human heart and a VAD included. A feedback loop was then closed to maintain a desired reference differential pressure across the system. A proportional‐integral (PI) controller was developed to adjust the motor speed and maintain the system reference differential pressure when changes occur in the natural heart. The effects of natural heart pulsatility on the control system show that the reference blood differential pressure is maintained without requiring CF3 motor pulsatility.