PDMS-Based Low Cost Flexible Dry Electrode for Long-Term EEG Measurement

In this paper, a novel flexible dry electrode for long-term electroencephalogram (EEG) measurement is presented. Though the standard wet electrodes (Ag/AgCl) were used widely, they have their own drawbacks, such as the need for conductive gel and skin preparation, which causes the user discomfort and is unsafe, and cannot fit the long-term EEG measurement. To overcome these drawbacks of the wet electrodes, a novel flexible dry electrode made of Polydimethysiloxane is proposed; it works without conductive gel and skin preparation. More importantly, this flexible dry electrode with pins structure can directly measure the EEG of hairy sites through hair. The impedances in frequency and time domains are tested to characterize the performance of the proposed dry electrode. In addition, to estimate signal quality, the average correlation and the power spectrum are presented between different electrodes. This flexible dry electrode can meet the requirement of high quality EEG measurement.

[1]  S. Nishimura,et al.  Clinical application of an active electrode using an operational amplifier , 1992, IEEE Transactions on Biomedical Engineering.

[2]  L. Kirkup,et al.  A direct comparison of wet, dry and insulating bioelectric recording electrodes. , 2000, Physiological measurement.

[3]  T. D. Clark,et al.  An ultra-low-noise electrical-potential probe for human-body scanning , 2000 .

[4]  M. Teplan.  FUNDAMENTALS OF EEG MEASUREMENT , 2002 .

[5]  B. Roth,et al.  A mathematical model for electrical stimulation of a monolayer of cardiac cells. , 2004 .

[6]  Emil S Valchinov,et al.  An active electrode for biopotential recording from small localized bio-sources , 2004, Biomedical engineering online.

[7]  S. Grimnes.  Impedance measurement of individual skin surface electrodes , 1983, Medical and Biological Engineering and Computing.

[8]  Steffen Leonhardt,et al.  Wireless and Non-contact ECG Measurement System – the “Aachen SmartChair” , 2007 .

[9]  A. Gruetzmann,et al.  Novel dry electrodes for ECG monitoring , 2007, Physiological measurement.

[10]  K.-P. Hoffmann,et al.  Flexible dry surface-electrodes for ECG long-term monitoring , 2007, 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[11]  P. Sheng,et al.  Characterizing and Patterning of PDMS‐Based Conducting Composites , 2007 .

[12]  R. Matthews,et al.  A Wearable Physiological Sensor Suite for Unobtrusive Monitoring of Physiological and Cognitive State , 2007, 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[13]  Tingrui Pan,et al.  Photopatternable Conductive PDMS Materials for Microfabrication , 2008 .

[14]  M Oehler,et al.  A multichannel portable ECG system with capacitive sensors , 2008, Physiological measurement.

[15]  K. Park,et al.  Flexible polymeric dry electrodes for the long-term monitoring of ECG , 2008 .

[16]  Kin-fai Wu,et al.  Contactless and continuous monitoring of heart electric activities through clothes on a sleeping bed , 2008, 2008 International Conference on Information Technology and Applications in Biomedicine.

[17]  Gert Cauwenberghs,et al.  Non-contact Low Power EEG/ECG Electrode for High Density Wearable Biopotential Sensor Networks , 2009, 2009 Sixth International Workshop on Wearable and Implantable Body Sensor Networks.

[18]  Jerry Y. H. Fuh,et al.  Micro-spike EEG electrode and the vacuum-casting technology for mass production , 2009 .

[19]  Chia-Lin Chang,et al.  Power-efficient wireless sensor for physiological signal acquisition , 2009 .

[20]  Francis E. H. Tay,et al.  A microfabricated electrode with hollow microneedles for ECG measurement , 2009 .

[21]  Florin Popescu,et al.  Performance of novel dry electrode EEG cap for evoked potential and band-power activity detection. , 2009 .

[22]  Seulki Lee,et al.  A Wearable ECG Acquisition System With Compact Planar-Fashionable Circuit Board-Based Shirt , 2009, IEEE Transactions on Information Technology in Biomedicine.

[23]  Jin-Woo Choi,et al.  Patterning conductive PDMS nanocomposite in an elastomer using microcontact printing , 2009 .

[24]  Marcelo Haberman,et al.  Insulating electrodes: a review on biopotential front ends for dielectric skin–electrode interfaces , 2010, Physiological measurement.

[25]  André van Schaik,et al.  A new EEG recording system for passive dry electrodes , 2010, Clinical Neurophysiology.

[26]  Yong Gyu Lim,et al.  Thin and flexible active electrodes with shield for capacitive electrocardiogram measurement , 2010, Medical & Biological Engineering & Computing.

[27]  S. Leonhardt,et al.  Characterization of textile electrodes and conductors using standardized measurement setups , 2010, Physiological measurement.

[28]  José Higino Correia,et al.  New dry electrodes based on iridium oxide (IrO) for non-invasive biopotential recordings and stimulation , 2010 .

[29]  P. M. Mendes,et al.  Flexible PDMS -based dry electrodes for electro-optic acquisition of ECG signals in wearable devices , 2010, 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology.

[30]  Tzyy-Ping Jung,et al.  Dry-Contact and Noncontact Biopotential Electrodes: Methodological Review , 2010, IEEE Reviews in Biomedical Engineering.

[31]  Gert Cauwenberghs,et al.  Wireless non-contact cardiac and neural monitoring , 2010, Wireless Health.

[32]  Gert Cauwenberghs,et al.  Wireless Non-contact EEG/ECG Electrodes for Body Sensor Networks , 2010, 2010 International Conference on Body Sensor Networks.

[33]  Jyh-Yeong Chang,et al.  Novel Dry Polymer Foam Electrodes for Long-Term EEG Measurement , 2011, IEEE Transactions on Biomedical Engineering.

[34]  C. Grozea,et al.  Bristle-sensors—low-cost flexible passive dry EEG electrodes for neurofeedback and BCI applications , 2011, Journal of neural engineering.

[35]  Eric McAdams,et al.  Biomedical Electrodes For Biopotential Monitoring and Electrostimulation , 2011, Bio-Medical CMOS ICs.