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Related Experiment Videos

Electrohydraulic ventricular assist device development.

P D Diegel1, T Mussivand, J W Holfert

  • 1Institute for Biomedical Engineering, University of Utah, Salt Lake City 84103.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 1, 1992
PubMed
Summary
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A new electrohydraulic ventricular assist device uses a brushless DC motor and rechargeable batteries for power. Its transcutaneous energy transfer system enables efficient, long-term operation, paving the way for improved cardiac support.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Energy Systems

Background:

  • Ventricular assist devices (VADs) are crucial for managing heart failure.
  • Existing VADs face challenges with power supply and system integration.
  • Need for robust, long-term, and minimally invasive VAD solutions.

Purpose of the Study:

  • To develop and evaluate a novel electrohydraulic ventricular assist device (VAD).
  • To assess the performance and energy efficiency of the VAD's components, including its transcutaneous energy transfer (TET) system.
  • To prepare the VAD for clinical application through design modifications and fit trials.

Main Methods:

  • Development of an electrohydraulic VAD featuring an axial flow pump and brushless DC motor.

Related Experiment Videos

  • Integration of rechargeable internal Ni/Cd and external Ag/Zn batteries for power supply.
  • Implementation of a transcutaneous energy transfer (TET) system for wireless power transmission.
  • Utilizing an internal controller for system management and an infrared data link for communication.
  • Computer modeling for performance prediction and in vitro testing for functional assessment.

    • Main Results:

    • The VAD system demonstrated an in vitro pumping capacity of 5.7 L/min at specified pressures.
    • The internal battery supported 40 minutes of operation after 540 cycles; the external battery supported 4 hours after 150 cycles.
    • The TET system achieved over 80% efficiency within the 15-30 W power range, delivering up to 60 W.
    • Device dimensions are 180 mm x 116 mm x 40 mm, with configurations refined through fit trials.

    Conclusions:

    • The developed electrohydraulic VAD shows promising performance for cardiac support.
    • The integrated power system, including TET, offers efficient and reliable energy delivery.
    • The device is being optimized for calf implantation, indicating progress towards clinical viability.