Wearable Multiple Body Signal Monitoring System with Single Biocompatible AlN Piezoelectric Sensor

Monitoring Cardiovascular Physiology Using Bio-Compatible AlN Piezoelectric Skin Sensors

“…This strategic location permits recording chest movements translated through the SSN, allowing respiration rate extraction. Moreover, the SSN is close to the base of the heart and ascending aorta; therefore, it is also possible to detect blood pulsation and record heart sound components by leveraging the mechano-acoustic properties of the AlN skin sensor [42]. This could help healthcare providers by reducing the time spent on auscultation.…”

“…The normal audible heart sounds typically follow a periodic pattern of 2 pulses, the first and second heart sounds, (S1) and (S2) 10, with frequencies between 20 and 150 Hz[7],[50]. Since the AlN films can detect the physical vibrations produced by the mechanical events of the heart muscles of the sounds[42], we hypothesize that the signal obtained from the SSN measurement site, situated closest to the heart, contains the S1 and S2 heart sound components. The sensor deforms in response to the mechanical vibrations translated from the heart onto the chest wall, allowing us to obtain a signal containing information corresponding to the valve closures, i.e., S1 and S2.…”