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New Wireless EEG System for Mobile Brain Wave Monitoring (video)

October 10th, 2012 Medgadget Editors Neurology

Imec, Holst Centre and Panasonic have unveiled a new version of their wireless EEG headset. The device monitors brain waves using eight channels and transmits readings directly to a wireless receiver up to 10 meters (30 feet) away. Because it can be applied by the user without assistance from a highly trained professional, coupled with the fact that it can be used outside the clinic, the device may open new doors for using EEG to study the brain in a variety of situations and environments.

Advancements in the new system over the previous model include continuous impedance monitoring for signal consistency and confidence in the readings, as well as a see-through design that makes it look like the wearer might be receiving signals from someone in deep space.

More technical details about the system from the press release:

The system integrates circuit level components including imec’s active electrodes and EEG amplifier together with a microcontroller and a low power radio. It is capable of continuously recording 8 channel EEG signals while concurrently recording electrode-tissue contact impedance (ETI). This simultaneous ETI recording enables continuous, remote assessment of electrode contact status during EEG recording. The active electrodes reduce the susceptibility of the system to power-line interference and cable motion artifacts, thus improving signal quality. The system can be configured at run-time to change the settings of the recordings such as the number of channels, or enabling/disabling the impedance recording. The autonomy of the system ranges from 22 hours (8 channels of EEG with ETI) to 70 hours (1 channel of EEG only).

The system has a high common-mode rejection ratio (>92 dB), low noise (<6 µVpp, 0.5-100Hz), DC offset tolerance of +/- 900mV and is AC coupled with configurable cut-off frequency. Sensitivity and dynamic range are configurable through a programmable gain stage (default 1.5mVpp and 366nV, respectively).The system (with dry electrodes and no skin preparation) is validated against a commercially available wired reference system (with wet electrodes and skin preparation), comparing the spectra between 1 and 30Hz. The high correlation coefficients (ranging from 0.81to 0.98 in four 1-minute recordings with eyes open) indicate that both systems have similar performance.

The heart of the system is the low-power (750µW) 8-channel EEG monitoring chipset. Each EEG channel consists of two active electrodes and a low-power analog signal processor. The EEG channels are designed to extract high-quality EEG signals under a large amount of common-mode interference. The active electrode chips have buffer functionality with high input impedance (1.4GΩ at 10Hz), enabling recordings from dry electrodes, and low output impedance reducing the power-line interference without using shielded wires

The system is integrated into imec’s EEG headset with dry electrodes, which enables EEG recordings with minimal set-up time. The small size of the electronics system, measuring only 35mm x 30mm x 5mm (excl battery), allows easy integration in any other product.

Flashbacks: Wireless Mobile EEG Headset for Live Brain Monitoring; Wireless EEG Powered by Body Heat

Imec press release: Imec, Holst Centre and Panasonic Present Wireless Low-power Active-Electrode EEG Headset

(hat tip: Neurogadget.com)

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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