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Related Experiment Videos

Detection of left ventricle function from a magnetically levitated impeller behavior.

Hideo Hoshi1, Junichi Asama, Chikara Hara

  • 1Tokyo Medical and Dental University, Department of Artificial Organs, Institute of Biomaterials and Bioengineering, Tokyo, Japan.

Artificial Organs
|May 11, 2006
PubMed
Summary

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This study demonstrates that magnetically levitated centrifugal rotary blood pumps (Mag-Lev CRBPs) offer stable, low-power impeller control. Mag-Lev CRBP signals can also noninvasively diagnose cardiac function, showing promise for advanced circulatory support.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Medical Diagnostics

Background:

  • Magnetically levitated centrifugal rotary blood pumps (Mag-Lev CRBPs) are a promising technology for long-term circulatory support.
  • Understanding impeller behavior and controllability is crucial for safe and effective Mag-Lev CRBP operation.
  • Simulating heart failure conditions allows for realistic testing of blood pump performance.

Purpose of the Study:

  • To investigate the controllability and impeller dynamics of a Mag-Lev CRBP in a simulated heart failure model.
  • To assess the potential of Mag-Lev CRBP signals for noninvasive cardiac function diagnosis.

Main Methods:

  • A Mag-Lev CRBP was integrated into a simulated circulatory model using a pneumatically driven pulsatile blood pump to mimic the left ventricle (LV).

Related Experiment Videos

  • Five eddy current sensors monitored impeller behavior across five axes (x, y, z, theta, phi).
  • Active feedback control was applied to the x- and y-axes, while permanent magnets controlled the remaining axes.

    • Main Results:

    • Impeller movement was precisely controlled within +/-10-20 micrometers in static conditions and 2-22 micrometers in pulsatile conditions.
    • Impeller movement amplitude varied with simulated LV function, increasing from 12.6 micrometers in a failing heart to 19.2 micrometers in a recovered heart.
    • The Mag-Lev CRBP demonstrated stable five-axis control, low power consumption (0.6-0.9 W), and noncontact operation, with impeller position reflecting LV function.

    Conclusions:

    • Mag-Lev CRBPs provide effective noncontact, low-power impeller control.
    • Impeller position signals correlate with left ventricular function, suggesting potential for noninvasive cardiac diagnostics.
    • The Mag-Lev CRBP technology shows significant promise for both advanced circulatory support and cardiac function monitoring.