Figure 1.

The proposed wrist-type PPG device for blood pressure estimation using reflective PPG signal. (A) The bottom of the proposed wrist-type PPG device integrated with a PPG biosensor that should be contacted with the skin inseparably. (B) In a practical wearing situation, the device was attached to the user’s wrist to enable the online measurements of PPG-based BP and other vital signs. The physiological data were wirelessly transmitted and shown in the mobile APP. (C) The APP also provided daily recording history of SBP, DBP, average HR (AVG HR), and physical activity count (PAC).