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Related Experiment Videos

A motor-driven ventricular assist device controlled with an optical encoder system

T Nakamura1, K Hayashi, H Yamane

  • 1Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Japan.

Bio-Medical Materials and Engineering
|January 1, 1993
PubMed
Summary
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A new electric motor-driven ventricular assist device (VAD) shows improved efficiency and feasibility for long-term implantation. Optimized motor control enhances performance, suggesting potential for advanced cardiac support systems.

Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Cardiovascular Technology

Background:

  • Heart failure necessitates advanced circulatory support.
  • Existing ventricular assist devices (VADs) face challenges in long-term efficacy and efficiency.
  • Development of implantable, efficient VADs is crucial for patient outcomes.

Purpose of the Study:

  • To develop and evaluate an electric motor-driven VAD for long-term internal use.
  • To optimize the control system for improved pump efficiency and performance.
  • To assess the feasibility of the VAD as a left ventricular assist device.

Main Methods:

  • Designed a pusher-plate-type blood pump integrated with an electric motor and ball screw actuator.
  • Implemented a closed-loop control system using a miniature optical rotary encoder and microprocessor.

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  • Conducted in vitro performance tests and acute in vivo assessments.

    • Main Results:

    • The VAD system achieved a maximum efficiency of 11%, doubling that of the previous prototype.
    • In vitro tests confirmed the system met required specifications.
    • Acute in vivo testing demonstrated feasibility as a left ventricular assist device.

    Conclusions:

    • The developed electric motor-driven VAD is a promising advancement for long-term cardiac support.
    • Optimized motor control and system design significantly improved efficiency.
    • Further refinement of mechanical components and assembly could enhance overall system efficiency.