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Related Experiment Videos

Incorporation of electronics within a compact, fully implanted left ventricular assist device.

Kevin Bourque1, David B Gernes, Howard M Loree

  • 1Thoratec Corperation, Woburn, Massachusetts 01888-2697, USA. kevin.bourque@thoratec.com

Artificial Organs
|October 31, 2002
PubMed
Summary

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Researchers integrated electronics into the HeartMate III blood pump, creating a fully implanted system for long-term use. This innovation minimizes external components and manages heat effectively for improved ventricular assist device reliability.

Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Cardiovascular Technology

Background:

  • Expanded indications for left ventricular assist devices (LVADs) necessitate fully implanted systems for very long-term applications (10+ years).
  • Sealed systems are crucial for reduced obtrusiveness and enhanced reliability compared to percutaneous configurations.
  • Intracorporeal power loss dissipation in sealed systems requires careful thermal management.

Purpose of the Study:

  • To incorporate motor drive and levitation control electronics within the HeartMate III blood pump.
  • To achieve this integration without substantially increasing the pump's overall dimensions.
  • To address the thermal management challenges associated with integrated electronics.

Main Methods:

  • Designed and fabricated electronics using a compact, dense rigid-flex satellite printed circuit board (PCB) arrangement.

Related Experiment Videos

  • Redesigned the pump's lower housing to accommodate the integrated PCBs, increasing height by only 5 mm.
  • Reduced the interconnect cable from 22 wires to 10 (two fully redundant sets of 5).

    • Main Results:

    • An ongoing in vitro test of the assembled pump has shown no issues over 5 months.
    • A 20-day in vivo test demonstrated minimal temperature increases (1°C), comparable to pumps without integrated electronics.
    • The integration was achieved with a minimal increase in pump height (5 mm).

    Conclusions:

    • Successful integration of motor drive and control electronics into the HeartMate III blood pump is feasible.
    • The redesigned system maintains reliability and manages thermal challenges effectively for long-term LVAD applications.
    • This advancement supports the development of fully implanted, less-obtrusive ventricular assist devices for expanded clinical use.