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Related Experiment Videos

Sensorless controlling method for a continuous flow left ventricular assist device.

M Oshikawa1, K Araki, G Endo

  • 1Intensive Care Division, Medical Informatics, the Second Department of Surgery, Miyazaki Medical College, Miyazaki;Cardiovascular Surgery, Oita Medical University, Oita, Japan. mitsuoO@post.miyazaki-med.ac.jp

Artificial Organs
|September 6, 2000
PubMed
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A new control strategy for continuous flow left ventricular assist devices (LVADs) was developed. This method effectively prevents reversed flow and ventricular collapse by monitoring motor current, ensuring safer cardiac support.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Control Systems

Background:

  • Continuous flow left ventricular assist devices (LVADs) are crucial for treating heart failure.
  • Effective control strategies are needed to optimize LVAD performance and patient safety.
  • Existing methods may struggle to prevent adverse events like ventricular collapse.

Purpose of the Study:

  • To develop and validate a novel control strategy for continuous flow LVADs.
  • To assess the ability of the strategy to prevent reversed flow and ventricular collapse.
  • To evaluate the influence of physiological parameters on the control system.

Main Methods:

  • A novel control strategy was devised for continuous flow LVADs.
  • Acute animal experiments were conducted to test the control strategy.

Related Experiment Videos

  • Pump pulsatility was estimated using the index of current amplitude (ICA) from motor current waveform.
  • The effects of preload (LVEDP), afterload (mAoP), and contractility (max LV dp/dt) were evaluated.

    • Main Results:

    • The ICA identified key points: t-i point (peak) indicating full assistance and s-i point (trough) indicating potential ventricular collapse.
    • Pump flow at the t-i point (Qt-i) demonstrated no flow regurgitation.
    • Preload (LVEDP) was the sole significant factor influencing Qt-i, while afterload and contractility did not.
    • The control strategy successfully prevented reversed flow and ventricular collapse in experiments.

    Conclusions:

    • The novel control strategy effectively manages continuous flow LVADs.
    • The method utilizes motor current waveform analysis (ICA) for precise control.
    • This approach enhances LVAD safety by mitigating reversed flow and preventing ventricular collapse.