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Related Experiment Videos

A safe automatic driving method for a continuous flow ventricular assist device based on motor current pulsatility:

George Endo1, Kenji Araki, Mitsuo Oshikawa

  • 1Miyazaki Medical College, Japan.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|January 30, 2002
PubMed
Summary

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A new sensorless control method for continuous-flow ventricular assist devices (CFVADs) uses Motor Current Amplitude index (ICA) to maintain safe operation. This approach effectively controls pump speed, preventing adverse flow conditions in mock circulation tests.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Engineering
  • Medical Devices

Background:

  • Continuous-flow ventricular assist devices (CFVADs) require precise control for safe and effective operation.
  • Previous work identified specific points (t-point and s-point) in the pump speed-Motor Current Amplitude index (ICA) relationship defining safe driving ranges.
  • Variations in preload, afterload, and left ventricular contractility affect CFVAD performance.

Purpose of the Study:

  • To determine the characteristic curves of pump speed versus ICA under varying physiological conditions.
  • To develop and evaluate an automatic control program for CFVADs using a target ICA value.
  • To assess the feasibility and effectiveness of sensorless automatic control for CFVADs.

Main Methods:

  • Determined characteristic curves by adjusting preload, afterload, and left ventricular contractility in a mock circulation loop.

Related Experiment Videos

  • Developed an automatic driving program to maintain ICA at a target value of 0.18.
  • Tested the automatic control program under various simulated hemodynamic conditions.

    • Main Results:

    • An ICA value of 0.18 consistently fell between the t- and s-points across tested conditions.
    • The automatic driving program successfully controlled CFVAD pump speed, maintaining ICA at 0.18.
    • The system prevented regurgitant flow and suction under diverse driving scenarios.
    • Pump speed stabilized within one minute of changes in driving conditions.

    Conclusions:

    • A sensorless method using a target ICA of 0.18 is feasible and effective for the automatic control of CFVADs.
    • This approach ensures safe operation by preventing adverse flow dynamics.
    • The developed program offers a reliable method for automated CFVAD management in mock circulation settings.