Study of the Skin-Electrode Contact Effect on the Electrocardiography Signal Recorded by Capacitive Electrodes

2019 ◽  
Author(s):  
Arman A. Boyakhchyan ◽  
Inna A. Lezhnina ◽  
Maxim I. Samolutchenko ◽  
Mark A. Ivanov ◽  
Alexander A. Aristov
Keyword(s):  
Skin Electrode ◽  
Contact Effect ◽  
Electrode Contact

scholarly journals Electrochemical Characteristics Based on Skin-Electrode Contact Pressure for Dry Biomedical Electrodes and the Application to Wearable ECG Signal Acquisition

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jinzhong Song ◽  
Tianshu Zhou ◽  
Zhonggang Liang ◽  
Ruoxi Liu ◽  
Jianping Guo ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Electrode Pair ◽  
Electrochemical Characteristics ◽  
Polarization Voltage ◽  
Skin Electrode ◽  
Textile Electrodes ◽  
Biomedical Electrodes ◽  
Electrode Contact ◽  
Evaluation Platform ◽  
Electrochemical Evaluation

Based on one simulated skin-electrode electrochemical interface, some electrochemical characteristics based on skin-electrode contact pressure (SECP) for dry biomedical electrodes were analysed and applied in this research. First, 14 electrochemical characteristics including 2 static impedance (SI) characteristics, 11 alternating current impedance (ACI) characteristics and one polarization voltage (PV), and 4 SECP characteristics were extracted in one electrochemical evaluation platform, and their correlation trends were statistically analysed. Second, dry biomedical electrode samples developed by the company and the laboratory, including textile electrodes, Apple watch, AMAZFIT rice health bracelet 1S, and stainless steel electrodes, were placed horizontally and vertically on the “skin” surface of the electrochemical evaluation platform, whose polarization voltages were quantitatively analysed. Third, electrocardiogram (ECG) collection circuits based on an impedance transformation (IT) circuit for textile electrodes were designed, and a wearable ECG acquisition device was designed, which could obtain complete ECG signals. Experimental results showed SECP characteristics for dry electrodes had good correlations with static impedance and ACI characteristics and the better correlation values among 2-10 Hz. In addition, polarization voltages in vertical state were smaller in horizontal state for dry biomedical electrodes, and polarization voltage of electrode pair (PVEP) values for Apple watch bottom was always smaller than ones for Apple watch crown and LMF-2 textile electrode. And the skin-electrode contact impedance of IT textile electrodes was less than the traditional textile electrodes.

Reverse‐curve‐arch‐shaped dry EEG electrode for increased skin–electrode contact area on hairy scalps

2015 ◽  
Vol 51 (21) ◽  
pp. 1643-1645 ◽  
Author(s):  
Jeong Su Lee ◽  
Chung Min Han ◽  
Jee Hoon Kim ◽  
Kwang Suk Park
Keyword(s):  
Contact Area ◽  
Skin Electrode ◽  
Electrode Contact

INVESTIGATION ON ETHANOL AND PROPYLENE GLYCOL AS ENHANCERS FOR SKIN-ELECTRODE CONDUCTIVITY IN BIOELECTRICAL POTENTIAL MEASUREMENT

2009 ◽  
Vol 02 (04) ◽  
pp. 175-177 ◽  
Author(s):  
W. C. NG ◽  
M. H. NG ◽  
K. S. LEE ◽  
X. P. LI
Keyword(s):  
Propylene Glycol ◽  
Skin Permeation ◽  
Impedance Measurement ◽  
Time Interval ◽  
Electrode Impedance ◽  
Dense Array ◽  
Potential Measurement ◽  
Skin Electrode ◽  
Electrode Contact ◽  
Bioelectrical Potential

In bioelectrical potential measurement with restricted skin-electrode contact area, such as in dense array EEG measurement where the electrolyte bridging effect1 is a major concern for signal reliability, an enhanced electrolyte solution is required for the skin-electrode impedance to reach the sufficiently low level within the minimum time interval. In this study, an electrolyte gel with its skin permeation ability enhanced by ethanol or propylene glycol has been investigated. The standard skin-electrode impedance measurement was carried out on the forehead in an area of 6 mm in diameter using standard Ag / AgCl EEG electrodes. The gel solutions with 0%, 7%, 18% and 28% of enhancers by volume are compared. The results show that both ethanol and propylene glycol reduce the permeation barrier of the stratum corneum so that ions in the electrolyte gel can penetrate more readily into the skin, enhancing the skin-electrode conductivity in reaching the steady value at a faster rate. It was further found that for the gel with higher percentage of ethanol, lower minimum skin-electrode impedance value was obtained. However, as the percentage of propylene glycol increased, it fails to attain low steady impedance values in the skin-electrode impedance measurements.

Development of medical capacitive coupling electrodes using the skin-electrode contact control

Sensor Review ◽  
2020 ◽  
Vol 40 (3) ◽  
pp. 347-354
Author(s):  
Gennadiy Evtushenko ◽  
Inna A. Lezhnina ◽  
Artem I. Morenetz ◽  
Boris N. Pavlenko ◽  
Arman A. Boyakhchyan ◽  
...  
Keyword(s):  
Personalized Medicine ◽  
The Body ◽  
Capacitive Coupling ◽  
Ecg Signal ◽  
Significant Deterioration ◽  
Content Type ◽  
Ecg Signals ◽  
Skin Electrode ◽  
Electrode Contact

Purpose The purpose of this paper is the development and study of capacitive coupling electrodes with the ability to monitor the quality of the skin–electrode contact in the process of electrocardiogram (ECG) diagnostics. The study’s scope embraces experimental identification of distortions contributed into the recorded ECG signal at various degrees of disturbance of the skin–electrode contact. Design/methodology/approach A capacitive coupling electrode is designed and manufactured. A large number of experiments was carried out to record ECG signals with different quality of the skin–electrode contact. Using spectral analysis, the characteristic distortions of the ECG signals in the event of contact disturbance are revealed. Findings It was found that the violation of the skin–electrode contact leads to significant deterioration in the recorded signal. In this case, the most severe distortions appear with various violations of the skin–electrode contact of two sensors in one lead. It has been experimentally shown that the developed sensor allows monitoring the quality of the contact, and therefore, improvement of the quality of signal registration, enabled by the use of bespoke processing algorithms. Practical implications These sensors will be used in personalized medicine devices and tele-ECG devices. Originality/value In this work, authors studied the effect of the skin–electrode contact of a capacitive electrode with the body on the quality of the recorded ECG signal. Based on the studies, the necessity of monitoring contact was shown to improve the quality of diagnostics provided by personalized medicine devices; the capacitive sensor with contact feedback was developed.

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