Dual-Mode Chest Wearable E-Tattoo for the Mobile Detection of Cardiac Time Intervals

Ambulatory cardiovascular monitoring could be vital for pre-emptive detection of heart disease and timely intervention to prevent serious cardiac complications. In this work we present a thin, flexible, stretchable, ultra light-weight wireless cardiac monitoring device that can be laminated onto the human chest like a temporary tattoo, called the e-tattoo. The e-tattoo laminated on human chest is able to extract important cardiac event and systolic timing intervals (STI) via dual-mode electrocardiography (ECG) and seismocardiography (SCG) sensors. The light, conformal form factor coupled with low power consumption enables uninterrupted monitoring of important STI like pre-ejection period (PEP) and left ventricular ejection time (LVET) over extended periods of time. We have achieved preliminary validation of the device against gold standards on a human subject.