A synchronized event-cue feedback loop integrating a 3D printed wearable flexible sensor-tactor platform.

Wearable devices designed for the somatosensory system aim to provide event-cue feedback electronics and therapeutic stimulation to the peripheral nervous system. This prompts a neurological response that is relayed back to the central nervous system. Unlike virtual reality tools, these devices precisely target peripheral mechanoreceptors by administering specific stimuli. Given variations in mechanoreceptor density and type across different body locations, adaptable flexible electronics are essential for effective targeting. Here, we develop a sensing-actuation platform using advanced manufacturing techniques. This platform seamlessly integrates custom flexible silicone-based actuators with carbon nanotube (CNT)-elastomer tactile sensors, enabling wearable electronics to deliver responsive feedback. By optimizing the cantilevers of the actuators, these tactors can achieve a broad spectrum of driving frequencies. Three functional, synchronized event-cue feedback devices-a prosthetic, sole, and glove-are presented, demonstrating their capability to utilize CNT sensors for detecting pressure variations from weight, gait, and grip, and transmit signals to flexible tactors, eliciting vibrotactile cues. The deployment of these innovative devices holds promise for stimulating peripheral nerves, augmenting prosthetic functionality, and enhancing grip control and tactile sensation in individuals with limited nervous system function.