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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
Published on: October 20, 2021
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A wireless power transfer system for leadless endovascular electrocorticography.
Zhangyu Xu1, Nhan Duy Truong1,2, Arman Ahnood3
1School of Biomedical Engineering, The University of Sydney, Darlington, NSW, Australia.
Communications Engineering
|March 6, 2026
Summary
This study introduces a novel wireless power transfer system for medical stents, enabling efficient power delivery to endovascular implants without invasive wires. The technology enhances patient comfort and supports long-term use of neuroprosthetic devices.
Area of Science:
- Biomedical Engineering
- Implantable Devices
- Wireless Power Transfer
Background:
- Traditional wireless power transfer for neuroprosthetics requires invasive lead wires.
- Existing methods face limitations in efficiency and patient comfort.
Purpose of the Study:
- To develop a fully wireless power delivery system for unmodified medical stents.
- To improve power transfer efficiency and reduce invasiveness for endovascular implants.
Main Methods:
- A subcutaneous relay converts inductive to capacitive coupling for power transmission.
- Experimental validation used various tissues and finite element simulations.
- Safety assessments included specific absorption rate and thermal analysis.
Main Results:
- Delivered over 45 mW of power, sufficient for endovascular electrocorticography (endoECoG) and biosignal sensing.
- Achieved 7.26% DC-to-DC efficiency, the highest reported for stent-based implants without custom modifications.
- Experimental results closely matched simulation predictions and confirmed safety compliance.
Conclusions:
- The proposed architecture enables efficient, safe, and fully wireless power delivery to endovascular implants.
- This technology supports long-term implantation, enhances patient comfort, and avoids the need for close skin contact.
- Further theoretical analysis is needed for a complete mechanistic understanding.
