Kirigami-patterned IoT-enabled Smart Anklet to Aid Physiotherapy of Patients with Foot Injury

Flexible strain sensors have great potential in wearable applications, yet it is challenging to achieve the desired sensitivity, stretchability, reversibility, durability, and skin conformity. This work reports a kirigami- structured strain sensor in the shape of an anklet, which was modified with gold decorated multi-walled carbon nanotubes and passivated with ecoflex. The proposed sensor depicted an ultra-high stretchability for an applied strain up to 180%. The extremely high sensitivity and the Internet-of- Things interface enable the real-time monitoring of ankle strain of injured patients undergoing rehabilitation.