Precise, quantitative measurements of the thermal properties of human skin can yield insights into thermoregulatory function, hydration, blood perfusion, wound healing, and other parameters of clinical interest. The need for wired power supply systems and data communication hardware limits, however, practical applicability of existing devices designed for measurements of this type. Here, a set of advanced materials, mechanics designs, integration schemes, and wireless circuits is reported as the basis for wireless, battery-free sensors that softly interface to the skin to enable precise measurements of its temperature and thermal transport properties. Calibration processes connect these parameters to the hydration state of the skin, the dynamics of near-surface flow through blood vessels and implanted catheters, and to recovery processes following trauma. Systematic engineering studies yield quantitative metrics in precision and reliability in real-world conditions. Evaluations on five human subjects demonstrate the capabilities in measurements of skin hydration and injury, including examples of continuous wear and monitoring over a period of 1 week, without disrupting natural daily activities.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/smll.201803192 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Digitally-defined ultrathin transparent wireless sensor network for room-scale imperceptible ambient intelligence.
Npj Flex Electron
February 2024
Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore.
Wireless and battery-free radio-frequency (RF) sensors can be used to create physical spaces that ambiently sense and respond to human activities. Making such sensors ultra-flexible and transparent is important to preserve the aesthetics of living environments, accommodate daily activities, and functionally integrate with objects. However, existing RF sensors are unable to simultaneously achieve high transparency, flexibility, and the electrical conductivity required for remote room-scale operation.
View Article and Find Full Text PDFAdaptive wireless-powered network based on CNN near-field positioning by a dual-band metasurface.
Nat Commun
November 2024
Institute of Electromagnetic Space and the State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China.
With the improvement of industry, the connectivity of electronic devices gradually shift from wired to wireless. As a solution for power delivery, the non-contact power transfer holds promising ways to charge for moving terminals, enabling battery-free sensing, processing, and communication. Based on a dual-band metasurface, this study proposes an adaptive wireless-powered network (AWPN) to realize the simultaneous wireless localization and non-contact power supply.
View Article and Find Full Text PDFMiniature bioelectronic implants promise revolutionary therapies for cardiovascular and neurological disorders. Wireless power transfer (WPT) is a significant method for miniaturization, eliminating the need for bulky batteries in devices. Despite successful demonstrations of millimetric battery free implants in animal models, the robustness and efficiency of WPT are known to degrade significantly under misalignment incurred by body movements, respiration, heart beating, and limited control of implant orientation during surgery.
View Article and Find Full Text PDFAdvancements and Challenges in Antenna Design and Rectifying Circuits for Radio Frequency Energy Harvesting.
Sensors (Basel)
October 2024
School of Computing, Engineering and the Built Environment, Edinburgh Napier University, Edinburgh EH10 5DT, UK.
The proliferation of smart devices increases the demand for energy-efficient, battery-free technologies essential for sustaining IoT devices in Industry 4.0 and 5G networks, which require zero maintenance and sustainable operation. Integrating radio frequency (RF) energy harvesting with IoT and 5G technologies enables real-time data acquisition, reduces maintenance costs, and enhances productivity, supporting a carbon-free future.
View Article and Find Full Text PDFA stealthy neural recorder for the study of behaviour in primates.
Nat Biomed Eng
November 2024
Department of Robotics and Mechatronics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Republic of Korea.
Article Synopsis
- Researchers have developed a stealthy neural recorder designed to monitor brain signals in non-human primates, allowing for the study of their natural behaviors.
- The device features a fully implantable, wireless, battery-free module that records brain activity and movement, along with a flexible 32-electrode neural probe.
- Successfully tested on a freely moving monkey, the recorder gathered data for over a month, which was then used to train an AI model to classify the animal's eating behaviors.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!