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Related Experiment Video

Updated: Jun 15, 2025

Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver

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Rotation insensitive implantable wireless power transfer system for medical devices using metamaterial-polarization

Tarakeswar Shaw¹, Bappaditya Mandal¹, Gopinath Samanta²

¹Department of Electrical Engineering, Microwaves in Medical Engineering Group, Division of Solid-State Electronics, Uppsala University, 75121, Uppsala, Sweden.

Scientific Reports

|August 24, 2024

Summary

This study presents a rotation-insensitive implantable wireless power transfer (WPT) system using circular polarization (CP) antennas and a metamaterial-polarization converter (MTM-PC) to enhance power transfer efficiency (PTE) for medical devices.

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Area of Science:

Biomedical Engineering
Electromagnetics
Materials Science

Background:

Implantable medical devices require efficient and reliable wireless power transfer (WPT).
Rotation of implanted devices can degrade WPT performance, posing a challenge for continuous power delivery.
Existing WPT systems often lack robustness against rotational misalignment.

Purpose of the Study:

To develop a rotation-insensitive implantable WPT system for medical devices operating in the 902-928 MHz ISM band.
To enhance the power transfer efficiency (PTE) of the implantable WPT system using a novel metamaterial-polarization converter (MTM-PC).
To ensure human safety by analyzing specific absorption rate (SAR) compliance.

Main Methods:

Designed a flexible, bio-compatible, circular polarization (CP) slot antenna for the receiver (Rx) within a skin tissue model.
Developed a free-space CP circular patch antenna for the transmitter (Tx).
Integrated a novel metamaterial-polarization converter (MTM-PC) to improve signal reception and efficiency.
Investigated the impact of Rx implant rotation on system performance.
Conducted numerical analysis for specific absorption rate (SAR) to ensure safety.

Main Results:

The proposed system demonstrated rotation-insensitivity for the implantable WPT.
Integration of the MTM-PC significantly improved the transmission coefficient amplitude by up to 7.04 dB.
Experimental validation using skin-mimicking gel and porcine tissue confirmed the feasibility and enhanced efficiency.
The MTM-PC integrated system showed a significant increase in PTE compared to systems without it.

Conclusions:

The developed CP antenna-based implantable WPT system with MTM-PC is a feasible and effective solution for medical devices.
The MTM-PC effectively enhances PTE and mitigates performance degradation due to rotation.
The system adheres to safety regulations, confirmed by SAR analysis, making it suitable for medical applications.