Performance evaluation of a new 3D printed dry-contact electrode for EEG signals measurement

Aaisha Diaa-aldeen Abdullah, Auns Q. Al-Neami


Traditional wet silver/silver chloride (Ag/AgCl) electrodes are used to record EEG signals mainly because of their potential repeatability, excellent signal-to-noise ratio (SNR), reliability, and biocompatibility. This type of electrode is only suitable for conductive glue, which can irritate the skin and cause injury. In addition, as time goes by, the conductive gel will be dehydrated, so the quality of the EEG signal will decrease. In order to overcome these problem, 3D printed dry-contact electrodes with multi-pins are designed in the this work to measure brain signals w.ithout prior preparation of skin or gel application. 3D printed electrodes are made from polylactic acids polymer and coated with suitable materials to enhance the conductivity. Electrode-Scalp impedance on human was measured in this study. To evaluate the dry-contact electrode, EEG measurement are performed in different subject and compared with EEG signals acquired by wet electrode by using linear correlation coefficient. Experimentaly results showed that the average electrode-skin impedance change of dry electrode in frontal site(9.42-7.25KΩ) and in occipital site(9.56-8.66KΩ). The correlation coeffeicent between dry electrode and wet electrode in frontal site (91.4%) and in occipital site (80%). To conclude, the 3D printed dry-contact electrode  can be will promising applied on hairy site and provide a promising solutions for the daily long-term monitoring EEG.


Dry-contact electrode; EEG signals; Electrode-skin impedance; Silver conductive paste;



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