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Updated: Jul 10, 2026
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Electric and Magnetic Field Devices for Stimulation of Biological Tissues
Published on: May 15, 2021
Powering implantable telemetry devices from localized magnetic fields.
Daniel McCormick1, Aiguo Patrick Hu, Poul Nielsen
1Bioengineering Institute, The University of Auckland, New Zealand. d.mccormick@auckland.ac.nz
Summary
This study introduces a new method for wirelessly powering implantable devices over large areas using an array of tuned resonant circuits. This inductive power transfer system can deliver 100 mW to a depth of 5cm.
Area of Science:
- Biomedical Engineering
- Electrical Engineering
- Implantable Devices
Background:
- Wireless power transfer is crucial for implantable medical devices.
- Existing systems often have limited charging range and efficiency.
- Need for robust, large-area inductive charging solutions.
Purpose of the Study:
- To present a novel method for large-area inductive powering of implantable telemetry devices.
- To develop a system capable of dynamically controlling the charging field location.
- To optimize charging pad geometry for efficient power delivery.
Main Methods:
- Utilized an array of individually tuned series resonant circuits on a charging pad.
- Varied the frequency of the driving voltage to control charging field location.
- Developed methods for resonant frequency control and charging pad geometry determination.
Main Results:
- Demonstrated a nine-coil system operating between 97 kHz and 209 kHz.
- Successfully delivered 100 mW of power to an implanted telemeter.
- Achieved power delivery at a height of 5cm above the charging pad.
Conclusions:
- The proposed inductive powering method enables large-area wireless charging for implantable devices.
- The system offers dynamic control over the charging field, enhancing usability.
- This technology has significant potential for future implantable medical systems.
