[Verification of skin paste electrodes used in wireless polysomnography]

Area of Science:

• Biomedical Engineering
• Materials Science
• Neuroscience

Background:

• Wireless portable sleep monitoring requires reliable and comfortable electrodes.
• Traditional electrodes can be invasive and may cause discomfort during extended wear.
• Developing flexible, biocompatible electrodes is crucial for improving sleep monitoring technology.

Purpose of the Study:

• To investigate the efficacy of novel flexible electrodes for wireless sleep monitoring.
• To analyze the electrooculogram (EOG) and electroencephalography (EEG) signal quality obtained from these flexible electrodes.
• To compare the performance of flexible electrodes against traditional gold cup electrodes.

Main Methods:

• Flexible electrodes were fabricated using microelectromechanical systems (MEMS) technology, incorporating biocompatible parylene, chromium, and gold layers.
• Electrodes were designed in a grid pattern on medical adhesive tape to ensure tight skin contact and reduce impedance.
• Alternating current impedance was measured, and EOG/EEG signals were recorded using a wireless acquisition system, with EEG noise amplitude compared to gold cup electrodes.

Main Results:

• The flexible electrodes adhered tightly to the skin and successfully collected desired signals.
• Measured alternating current impedance ranged from 4 kΩ to 13 kΩ within the typical EEG frequency range (<100 Hz).
• EOG signals met clinical requirements, and EEG signals exhibited lower noise amplitude compared to gold cup electrodes.

Conclusions:

• The developed flexible electrodes are a viable alternative for monitoring EOG and EEG signals.
• These findings support the further development of wireless portable sleep monitoring devices utilizing flexible electrode technology.