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Related Experiment Videos

Controller for an axial flow blood pump

H Konishi1, J F Antaki, D V Amin

  • 1University of Pittsburgh, Artificial, Heart and Lung Program, School of Medicine, Pennsylvania, USA.

Artificial Organs
|June 1, 1996
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel noninvasive control method for rotary blood pumps, using motor current analysis to maintain physiologic preload and prevent device-induced complications. This approach enhances patient safety by avoiding extra sensors.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Control Systems

Background:

  • Rotary blood pumps (RBPs) have limited noninvasive monitoring capabilities, primarily relying on motor current.
  • Maintaining appropriate systemic circulation and preventing pulmonary damage requires precise control of RBP speed and preload.
  • Existing control methods often necessitate additional invasive transducers, increasing complexity and risk.

Purpose of the Study:

  • To develop and evaluate a noninvasive control strategy for RBPs based on motor current analysis.
  • To maintain physiologic preload within a safe range, avoiding ventricular collapse.
  • To eliminate the need for extraneous transducers in RBP regulation.

Main Methods:

  • Collected steady-state data from chronic trials of the Nimbus AxiPump in sheep and calves.

Related Experiment Videos

  • Increased pump speed incrementally until left atrial pressure reached zero, simulating preload reduction.
  • Utilized Fourier analysis to correlate pump preload with the power spectra of the motor current waveform.

    • Main Results:

    • Established a relationship between pump preload variations and the power spectra of the pump current waveform.
    • Devised a control method focused on minimizing the second and third harmonics of the current waveform.
    • Demonstrated the potential for noninvasive regulation of pump preload.

    Conclusions:

    • A noninvasive control method using motor current harmonics can effectively regulate RBP preload.
    • This approach minimizes the risk of ventricular collapse and associated complications.
    • The proposed controller offers a transducer-free solution for enhanced RBP management.