A 9.2-Gram Fully-Flexible Wireless Dry-Electrode Headband for Non-Contact Artifact-Resilient EEG Monitoring and Programmable Diagnostics

Abstract

An 8-channel wearable wireless device for surface EEG monitoring is presented. The entire multi-channel recording, quantization, and motion artifact removal is implemented on a 4-layer polyimide flexible substrate. The recording electrodes and active shielding are also integrated on the same substrate, yielding the smallest form factor compared to the state of the art. Thanks to the dry non-contact electrodes, the system is quickly mountable with minimal assistance required, making it an ideal frontal and temporal-lobe EEG monitoring device in emergency departments. The flexible main board is connected to a rechargeable battery on one end and to a 13×17mm2 rigid board on the other end. The mini rigid board hosts a low-power programmable FPGA and a BLE 5.0 transceiver, which add diagnostic capability and wireless operation features to the device, respectively. The device performance in terms of voltage gain (260 V/V), bandwidth (DC-700 Hz), input-referred noise, motion artifact removal, and wireless communication throughput (up to 1Mbps) is experimentally validated and the overall power consumption is measured to be 27mW. The entire wearable solution with the battery weight 9.2 grams.