Device Mechanics

Fig. 2. Continuous monitoring of heart sounds in everyday life, fully portable. (A) Photographs depicting various daily tasks such as standing-control, conversing, walking, and jogging. The SWS is contrasted to a rigid device to illustrate its performance (right photo). (B) A graph depicting cardiac sounds recorded by both devices throughout various activities (control, talking, walking, and jogging). The SWS displays motion-artifact controlled data with little noise, whereas the rigid device displays data that has been corrupted owing to device delamination caused by movements. (C) Zoomed-in data of recorded cardiac sounds; walking and jogging generate noise concerns in the rigid one, but have no influence on the SWS. (D) Pictures comparing two devices (top: SWS, bottom: rigid) installed on a soft skin model, with the SWS showing conformable contact and the rigid device showing delamination (left photos), and enlarged view of device structures without the top encapsulation (right photos). (E) SWS detailed design with skin-conformal contact to reduce variations in skin-to-diaphragm air gaps.