Abstract
In this work, we report on the design, fabrication, and characterization of dry electrodes for the measurement of pulse plethysmography signals from distal arteries via electrical impedance. Four finger-track electrode designs were fabricated using a screen-printing technique, employing a stretchable Ag paste on a TPU stretchable substrate transferred to a textile structure. Electromechanical measurements (i.e. resistance (Ω) versus elongation (mm)) showed the confirmation of three distinct stages: stretchability, relaxation, and swelling on the printed tracks, where the finger tracks #1, #2, and #4 demonstrated a stable return to zero resistance and track #3 exhibited a negative return-to-zero value, with a decrease of a normalized resistance of 0.5 Ω. Furthermore, a preliminary test with the electrodes, demonstrates plethysmography signal waveforms are comparable