Detection and Wireless Charging for an Implantable Device Using an Ultrasound Array System
Date Issued
2015
Date
2015
Author(s)
Sun, Yi-Chiang
Abstract
Abstract Traditionally, the power for an implantable device is provided by a battery. Therefore, there are certain limitations including changing the battery and the size of the battery. Wireless power transfer is one of the solutions to alleviating such problems. Recently, we have demonstrated that wireless power transfer can be achieved by ultrasound and the implantable device can be detected by ultrasound using a housing with specific microstructures. In this study, we hypothesize that these tasks can all be performed by a clinical ultrasound array system. The custom design IC in the implantable device is 2 mm×2.2 mm and we are able to transfer power of 2.3 mW which is more than enough for neural stimulation. There is also a pyramid microstructure on the implantable device, which reflects ultrasound to generate signals with specific spectral characteristics. Applying time-frequency analysis to analyze the signal, frequency deceasing occurs and location of the device can be detected. Thus, we have demonstrated that neural stimulation using the proposed setup can be performed using a clinical ultrasound array system. Keywords: implantable system, wireless power transferring, microstructure, ultrasound array system, localization
Subjects
implantable system
wireless power transferring
microstructure
ultrasound array system
localization
Type
thesis
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