Fig. 1: Overall design of the watch for noninvasive continual glucose monitoring.
From: Highly integrated watch for noninvasive continual glucose monitoring
a Exploded view of the watch. b Diagram of the printed circuit board (PCB) in the watch showing each functional module. (1) Constant current source, (2) A/D differential module, (3) microcontroller, (4) bluetooth module, and (5) power supply. c Structure of the flexible glucose sensor patch for interstitial fluid (ISF) extraction and glucose detection. d Working mechanism of reverse iontophoresis for noninvasive ISF extraction achieved with the glucose sensor patch. e System-level block diagram of the watch and user interface on a smartphone, showing the synergy among the functional units
