Detection and Wireless Charging for an Implantable Device Using an Ultrasound Array System

• Main Authors: Yi-Chiang Sun, 孫義強
• Other Authors: 李百祺
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/42815213554597166939

碩士 === 國立臺灣大學 === 生醫電子與資訊學研究所 === 104 === 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