Fabric-Based Wearable Dry Electrodes for Body Surface Biopotential Recording

Area of Science:

• Biomedical Engineering
• Wearable Sensors
• Materials Science

Background:

• Limitations of conventional wet electrodes, including skin irritation and limited shelf life, necessitate alternative solutions for biopotential monitoring.
• Dry electrodes are being explored as a viable alternative for long-term electrocardiogram (ECG) monitoring due to their potential for improved user comfort and convenience.
• Nonwoven fabrics provide a flexible and conformable substrate for developing novel dry electrode designs.

Purpose of the Study:

• To investigate a flexible and conformable dry electrode design based on nonwoven fabrics for biopotential measurements.
• To evaluate the performance of screen-printed Ag/AgCl dry electrodes for electrocardiogram (ECG) signal acquisition.
• To analyze the influence of skin-electrode interface, form factor, and electrode placement on signal quality and impedance.

Main Methods:

• Fabrication of multilayered dry electrodes using screen printing of Ag/AgCl conductive inks on flexible nonwoven fabrics.
• Characterization of the skin-electrode interface, including impedance measurements influenced by electrode area, material, and applied pressure.
• Comparative analysis of ECG signals acquired with dry and wet electrodes under varying body postures and movements.

Main Results:

• Skin-electrode impedance was found to be dependent on printed electrode area, interface material, and applied pressure.
• The fabricated fabric-based dry electrodes produced ECG signals comparable in quality to those obtained with conventional wet electrodes.
• The QRS peak amplitude of the ECG signal demonstrated a dependency on the printed electrode area and the spacing between the electrode and the body.

Conclusions:

• Fabric-based printed dry electrodes represent a cost-effective and user-friendly platform for mobile wearable health monitoring.
• The developed dry electrodes offer a promising solution for long-term ECG monitoring, addressing the drawbacks of traditional wet electrodes.
• The study highlights the potential of these electrodes in wearable sensing applications, emphasizing comfort and wearability.