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Operating point control system for a continuous flow artificial heart: in vitro study.

R Kosaka1, K Yanagi, T Sato

  • 1Institute of Systems and Engineering Mechanics, University of Tsukuba, Tsukuba, Ibaraki, Japan.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|June 7, 2003
PubMed
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This study introduces a servo control system for rotary blood pumps, ensuring safe operation by maintaining physiological conditions. The system effectively manages normal and abnormal pump functions, including suction, for improved heart assist device performance.

Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Cardiovascular Support

Background:

  • Rotary blood pumps are crucial for assisting failing natural hearts.
  • Ensuring operation within physiologically acceptable conditions is vital for patient safety.
  • Pump performance depends on impeller speed and pressure head, necessitating precise control.

Purpose of the Study:

  • To develop and evaluate a practical servo control system for rotary blood pumps.
  • To maintain pump operation within acceptable physiological limits.
  • To implement and test recovery mechanisms for abnormal operating conditions.

Main Methods:

  • Development of a servo control system utilizing proportional and derivative (PD) control.
  • Implementation of distinct control modes for normal and abnormal pump operation.

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  • Evaluation of the system's ability to manage conditions like suction and facilitate recovery.

    • Main Results:

    • The proposed servo control system effectively maintains the preset operating point during normal conditions.
    • The system successfully identifies and manages abnormal conditions, including suction events.
    • The controller demonstrated practical effectiveness in recovering from abnormal states and returning to normal operation.

    Conclusions:

    • The developed servo control system is practical and effective for rotary blood pumps.
    • The system ensures safe operation by managing physiological conditions and abnormal states.
    • This control strategy enhances the reliability and performance of heart assist devices.