From a sketch to a sensor on skin

Duoband starts as a sketch. We draw the skin circuitry in graphic design software, placing sensor zones 1, 2 and 3 around the wound region. That design is laser cut as a vinyl stencil on tattoo paper, gold leaf goes down over metal leaf adhesive, and the traces are sealed under a layer of adhesive and a silicone overlay. This is the DuoSkin method, and it works: it is accessible, cheap and skin-friendly.

Alongside the gold leaf, we build the rigid electronics. Temperature, pH and moisture sensors connect to an Arduino / ESP32, and we collect sample data over plain wires before anything touches the skin. The electronics are then mounted onto the gold leaf sandwich with conductive fabric tape. From there, data travels over NFC and Bluetooth to the app, which analyzes trends over hours and days and sends a notification when a reading breaks from the patient's baseline.