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Related Experiment Videos

Development of an automatic control algorithm for the electrohydraulic total artificial heart without transducers.

H C Kim1, P S Khanwilkar, K C Crump

  • 1Institute for Biomedical Engineering, University of Utah, Salt Lake City.

ASAIO Transactions
|July 1, 1991
PubMed
Summary

This study introduces a novel transducerless control algorithm for electrohydraulic total artificial hearts (EHTAHs). By analyzing motor parameters, it eliminates the need for implanted pressure sensors, simplifying device design.

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Area of Science:

  • Biomedical Engineering
  • Artificial Organs
  • Control Systems

Background:

  • Implantable total artificial hearts require reliable automatic control.
  • Current systems often rely on multiple implanted physiological sensors, increasing complexity and potential failure points.
  • Minimizing sensor count is crucial for developing simpler, more reliable artificial heart systems.

Purpose of the Study:

  • To propose and evaluate a novel automatic control algorithm for an electrohydraulic total artificial heart (EHTAH) that eliminates the need for implanted pressure transducers.
  • To extract necessary physiological information from the motor's operational parameters instead of direct pressure measurements.
  • To simplify the design and enhance the reliability of implantable artificial hearts.

Main Methods:

Related Experiment Videos

  • Developed a transducerless control algorithm for the EHTAH system.
  • Extracted physiological control information from the running motor's parameters, specifically correlating them with differential pressure across the axial flow pump.
  • Utilized changes in motor differential pressure as a cue for cardiac output control, relating it to systemic vascular resistance (SVR = (AoP - RAP) / CO).

Main Results:

  • Confirmed that the difference between mean aortic pressure (AoP) and mean right atrial pressure (RAP) correlates with differential hydraulic pressure across the energy converter during systole.
  • Tested an interim configuration with a single differential pressure transducer measuring energy converter hydraulic pressure on a mock circulation system.
  • Demonstrated that the resultant cardiac output (CO) response exhibited good sensitivity to changes in both preload and afterload.

Conclusions:

  • A transducerless control approach for EHTAH is feasible by leveraging motor operational parameters.
  • This method simplifies artificial heart design by reducing the number of implanted sensors.
  • The developed algorithm shows promise for effective cardiac output regulation in artificial heart systems.