Authors: Katrina Guido, Asimina Kiourti
Source: FERMAT, Volume 36, Communication 3, Nov.-Dec., 2019
Abstract: Having previously proposed a novel wireless, batteryless neurosensing system able to detect deep brain signals down to 20 μVpp during in vitro testing, we now seek to maintain this high sensitivity under in vivo conditions as well. The latter implies recording of deep brain activity via clinical neural electrodes which have inherently high impedances. In this paper, we report a link budget analysis that illuminates the significance of matching the brain implant to its associated electrode. Potentiostatic measurements of clinical microelectrodes are also provided, showing impedances in the tens of kΩ to MΩ range. In the future, these studies can be leveraged to maintain the wireless, passive, batteryless operation while matching implant impedance to the high impedance of clinical electrodes.
Index Terms: brain implants, impedance matching, implantable antennas
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Matching Considerations for Wireless and Batteryless Brain Implants