PDMS-Silver Ink Dry Electrodes for Fingertip Electrocardiogram Signal Acquisition: Development and Evaluation

Area of Science:

• Biomedical Engineering
• Materials Science

Background:

• High-quality electrocardiogram (ECG) signal acquisition is vital for biomedical applications.
• Traditional silver/silver chloride (Ag/AgCl) wet electrodes present challenges regarding user comfort, long-term wearability, and application simplicity.

Purpose of the Study:

• To develop and evaluate novel solid-state electrodes for ECG signal acquisition.
• To assess the performance of these electrodes, particularly for finger-based measurements.
• To compare their efficacy against conventional Ag/AgCl electrodes.

Main Methods:

• Fabrication of solid-state electrodes using a polydimethylsiloxane (PDMS) substrate and a silver-ink conductive layer.
• Evaluation of ECG signal acquisition using the developed electrodes on fingers.
• Comparative analysis with signals obtained from traditional Ag/AgCl electrodes.
• Application of Dynamic Time Warping for signal synchronization and comparison.

Main Results:

• The developed PDMS-silver ink electrodes successfully acquired high-quality ECG signals.
• Consistent waveforms and minimal signal distortion were observed, even without conductive gels or a reference electrode.
• Dynamic Time Warping confirmed the similarity between signals from the new and traditional electrodes.
• The novel electrodes demonstrated improved comfort, reusability, and biocompatibility.

Conclusions:

• The developed solid-state PDMS-silver ink electrodes offer a promising, comfortable, and user-friendly alternative to traditional wet electrodes for ECG monitoring.
• These electrodes exhibit potential for various biomedical applications, including future integration into biometric recognition systems.