A Self-Powered Multifunctional Bracelet for Pulse Monitoring and Personal Rescue

Abstract

For outdoor workers or explorers who may be exposed to extreme or wild environments for a long time, wearable electronic devices with continuous health monitoring and personal rescue functions in emergencies could play an important role in protecting their lives. However, the limited battery capacity leads to a limited serving time, which cannot ensure normal operation anywhere and at any time. In this work, a self-powered multifunctional bracelet is proposed by integrating a hybrid energy supply module and a coupled pulse monitoring sensor with the inherent structure of the watch. The hybrid energy supply module can harvest rotational kinetic energy and elastic potential energy from the watch strap swinging simultaneously, generating a voltage of 69 V and a current of 87 mA. Meanwhile, with a statically indeterminate structure design and the coupling of triboelectric and piezoelectric nanogenerators, the bracelet enables stable pulse signal monitoring during movement with a strong anti-interference ability. With the assistance of functional electronic components, the pulse signal and position information of the wearer can be transmitted wirelessly in real-time, and the rescue light and illuminating light can be driven directly by flipping the watch strap slightly. The universal compact design, efficient energy conversion, and stable physiological monitoring demonstrate the wide application prospects of the self-powered multifunctional bracelet.

Multiscale Structural Triboelectric Aerogels Enabled by Self‐Assembly Driven Supramolecular Winding

“…[4] Sun et al developed a wearable electronic bracelet integrating health monitoring and emergency functions based on triboelectric nanogenerators, which is important for long-term health monitoring and personal rescue of outdoor workers. [5] On the other hand, Ma et al developed a variety of smart wearable textiles for human movement monitoring by combining textiles with TENGs. [6] The new generation of triboelectric sensors not only solve the energy supply problem of electronic products, but also broaden the selection of materials, so as to flexibly give more special functions to the sensing equipment.…”

Machine learning-assisted novel recyclable flexible triboelectric nanogenerators for intelligent motion

“… 1 , 2 , 3 , 4 , 5 These devices can either be implanted inside the human body or worn on the body’s surface, including smart bracelets, smart watches, smart clothing, etc. 6 , 7 , 8 , 9 They incorporate built-in sensors to capture the user’s physiological metrics and motion data, which are subsequently processed, analyzed and presented using various algorithms. 10 However, these devices face several challenges, such as discomfort for users, limitations in portability, limited battery life, reliance on external power sources leading to increased production costs, and environmental concerns.…”