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Resonant Ultrasonic Wireless Power Transmission for Bio-Implants
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- Authors
- Sung Q Lee, Woosub Youm, Gunn Hwang, Kee S. Moon, Yusuf Ozturk
- Issue Date
- 2014-03
- Citation
- Active and Passive Smart Structures and Integrated Systems 2014 (SPIE 9057), v.9057, pp.1-9
- Publisher
- SPIE
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, we present the ultrasonic wireless power transmission system as part of a brain-machine interface (BMI) system in development to supply the required electric power. Making a small-size implantable BMI, it is essential to design a low power unit with a rechargeable battery. The ultrasonic power transmission system has two piezoelectric transducers, facing each other between skin tissues converting electrical energy to mechanical vibrational energy or vice versa. Ultrasound is free from the electromagnetic coupling effect and medical frequency band limitations which making it a promising candidate for implantable purposes. In this paper, we present the design of piezoelectric composite transducer, the rectifier circuit, and rechargeable battery that all packaged in biocompatible titanium can. An initial prototype device was built for demonstration purpose. The early experimental results demonstrate the prototype device can reach 50% of energy transmission efficiency in a water medium at 20mm distance and 18% in animal skin tissue at 18mm distance, respectively. © 2014 SPIE.
- KSP Keywords
- Bio-implants, Coupling effects, Electric power, Electromagnetic coupling, Energy transmission, Low-Power, Piezoelectric Composite, Piezoelectric transducers(PZT), Rechargeable battery, Skin tissue, Ultrasonic Power