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Conference Paper
Wireless Power Transferring and Charging for Implantable Medical Devices Based on Ultrasonic Resonance
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- Authors
- Sung Q Lee, Woosub Youm, Gunn Hwang, Kee S. Moon
- Issue Date
- 2015-07
- Citation
- International Congress on Sound and Vibration (ICSV) 2015, pp.1-7
- Language
- English
- Type
- Conference Paper
- Abstract
- Technology and market together are drastically growing in the area of implantable devices for medical treatment including implantable cardiac defibrillator or deep brain stimulator. However, after 5 to 9 years later, a patient is forced to have surgery just for changing battery. In order to overcome the power limitation of primary battery, wirelessly recharging battery technology has been highly requested. Previous wireless power charging technologies such as magnetic resonance and induction coupling have limited applications because of its short transfer distance compared to device size and magnetic field intensity limitation for the safety of body exposure. As an alternative, the biocompatible wireless power transferring and charging technology is proposed using ultrasonic resonance devices. For the high efficient power transferring, optimal transfer frequency is calculated based on the acoustic radiation and damping effect. Then, the optimal load resistance is selected for matching power condition in receiver. And, transmitter is designed to match the optimal transfer frequency. The ultrasonic resonance transmitter and receiver are manufactured with the size of 30.0 mm diameter, 3.0 mm height. The energy transferring efficiency from input electrical power of transmitter to power of receiver is about 22.6 % through 10 mm skin tissue, experimentally. The maximum transferring power is up to 150 mW. This result is quite high considered with the device size and the power transfer distance.
- KSP Keywords
- Acoustic radiation, Battery technology, Damping effect, Device size, Electrical power, Implantable Medical Devices, Implantable cardiac defibrillator, Induction Coupling, Magnetic field intensity, Magnetic resonance(MR), Power Limitation