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Related Experiment Videos

A sophisticated electromechanical ventricular simulator for ventricular assist system testing.

J C Woodard1, S M Rock, P M Portner

  • 1Novacor Division, Baxter Healthcare Corporation, Oakland, California 94621.

ASAIO Transactions
|July 1, 1991
PubMed
Summary

New adaptive control algorithms enable automatic left ventricular assist system control. An electromechanical pump mimics heart function using a microprocessor feedback loop for precise hemodynamic management.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Technology
  • Medical Device Development

Background:

  • Advancements in chronically implanted left ventricular assist systems (LVAS) necessitate sophisticated control mechanisms.
  • Existing LVAS require improved adaptability to diverse hemodynamic conditions.
  • Automatic device control is crucial for optimizing patient outcomes with LVAS.

Purpose of the Study:

  • To develop novel adaptive control algorithms for LVAS.
  • To design an electromechanical pump capable of accurately mimicking natural ventricular function.
  • To implement a control system that ensures precise hemodynamic regulation.

Main Methods:

  • Development of a pusher-plate sac pump integrated with tri-leaflet valves.
  • Coupling the pump mechanism to a high-speed linear motor.

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  • Utilizing a microprocessor feedback loop to constrain pump chamber volume and pressure according to the time-varying elastance model.

    • Main Results:

    • The described electromechanical pump accurately replicates ventricular function.
    • The microprocessor feedback loop successfully enforces the time-varying elastance model.
    • The system demonstrates potential for automatic device control under varying hemodynamic conditions.

    Conclusions:

    • The developed electromechanical pump and control system offer a promising approach for advanced LVAS.
    • Adaptive control algorithms are key to achieving automatic and precise hemodynamic management in LVAS.
    • This technology has the potential to significantly improve the efficacy and safety of ventricular assist devices.