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An Automatic Flow Controller for a Centrifugal Blood Pump
Author(s) -
Beppu Toshiyuki,
Seo Kazuhiro,
Imai Yasuharu,
Takanashi Yoshinori,
Hoshino Shuichi,
Ohta Jun,
Aoki Mitsuru,
Uchita Shunji,
Suzuki Susumu,
Tajima Yukio,
Tooyama Noriyasu,
Fukui Yasuhiro
Publication year - 1997
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/j.1525-1594.1997.tb03712.x
Subject(s) - centrifugal pump , controller (irrigation) , blood flow , flow (mathematics) , computer science , mechanical engineering , mechanics , engineering , medicine , physics , impeller , cardiology , agronomy , biology
To regulate the perfusion flow rate of a centrifugal blood pump, a microcomputer controller was developed. The computer monitored the flow rate of the pump with an electromagnetic flowmeter or an ultrasonic pulse Doppler flowmeter, rotational speed of the pump, aortic pressure, and the amount of blood in a reservoir. A discrete integral controller with a control interval of 1 s was adopted for the controller. For the safety of the control system, we added functions for detecting a clamp on the tubing, a dislocation of the flow sensor, or an inverse direction of the flow sensor. During a standby period, the computer calculated the rotational speed from aortic pressure to minimize the forward or the backward flow at the start of the pump perfusion. The automatic flow controller was used on 5 patients during cardiac operations and maintained the flow rate within ±6% of the set point.