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Ultrasonic transcutaneous energy transfer for powering implanted devices
Shaul Ozeri1, Doron Shmilovitz
1School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel.
Ultrasonics
|December 25, 2009
Summary
This study presents ultrasonic transcutaneous energy transfer (UTET) for powering implanted devices. It achieved 27% efficiency for devices up to 40mm deep, offering a viable wireless charging solution.
Area of Science:
- Biomedical Engineering
- Energy Transfer Technologies
- Implantable Devices
Background:
- Wireless power transfer is crucial for implantable medical devices.
- Current methods face limitations in depth and efficiency.
- Ultrasonic transcutaneous energy transfer (UTET) offers a promising alternative.
Purpose of the Study:
- To investigate UTET for powering implanted devices up to 100 mW.
- To analyze a continuous wave 673 kHz single-frequency operation for subcutaneous implantation.
- To optimize power transfer efficiency and address design considerations.
Main Methods:
- Utilized PZT plane disc transducers with graphite acoustic matching layers.
- Implemented a 673 kHz continuous wave frequency for UTET.
- Conducted finite element simulations and experimental validation.
- Analyzed receiver rectifying electronics and bio-safety concerns.
Main Results:
- Achieved a peak power transfer efficiency of 27% at 70 mW output power.
- Demonstrated successful power delivery to devices implanted up to 40 mm deep.
- The implant-side power rectifier reached 88.5% efficiency.
Conclusions:
- UTET is a feasible method for wirelessly powering implanted devices.
- The proposed 673 kHz system demonstrates significant efficiency and depth capabilities.
- Further design considerations ensure safe and effective energy transfer for medical implants.
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