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Related Experiment Videos

Transcutaneous RF-powered implantable minipump driven by a class-E transmitter.

William H Moore1, Daniel P Holschneider, Tina K Givrad

  • 1Alfred E Mann Institute, University of Southern California, Los Angeles 90089, USA.

IEEE Transactions on Bio-Medical Engineering
|August 19, 2006
PubMed
Summary

This study presents an inductive coupling system for powering implantable minipumps in rats. The wireless power system successfully activated the pump in vivo, offering a weight-reduced, remotely controlled solution.

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Area of Science:

  • Biomedical Engineering
  • Implantable Devices
  • Wireless Power Transfer

Background:

  • Implantable devices require reliable power sources.
  • Existing power solutions for implantable pumps can be bulky or have limited operational duration.
  • Wireless power transfer offers a promising alternative for powering implanted systems.

Purpose of the Study:

  • To design and test an inductive coupling system for powering an implantable minipump in ambulating rats.
  • To evaluate the system's ability to provide sufficient power for pump activation in vivo.
  • To assess the system's performance during animal movement.

Main Methods:

  • A 2 MHz class-E oscillator driver powered a transmitter coil surrounding a rat cage.
  • A receiver coil, filtered rectifier, and voltage-sensitive switch powered the implantable minipump.

Related Experiment Videos

  • Implant current and voltage were measured to assess power delivery.
  • System performance was evaluated during in vivo testing with ambulating rats.

    • Main Results:

    • The inductive coupling system delivered 5.1 V DC current to the implant, sufficient for solenoid valve activation.
    • Implant current variations correlated with coupling coefficient changes, reflecting animal movement.
    • The minipump was successfully activated in vivo, accommodating the rat's vertical and horizontal movements.
    • The system demonstrated remote activation/deactivation capabilities.

    Conclusions:

    • The developed inductive coupling system provides a viable wireless power solution for implantable minipumps.
    • This technology offers advantages such as reduced implant weight, elimination of finite power sources, and remote control.
    • The system's ability to power the pump during animal ambulation demonstrates its practical utility in research applications.