Wireless sensors for continuous, multimodal measurements at the skin interface with lower limb prostheses

Jean Won Kwak, Mengdi Han, Zhaoqian Xie, Ha Uk Chung, Jong Yoon Lee, Raudel Avila, Jessica Yohay, Xuexian Chen, Cunman Liang, Manish Patel, Inhwa Jung, Jongwon Kim, Myeong Namkoong, Kyeongha Kwon, Xu Guo, Christopher Ogle, Dominic Grande, Dennis Ryu, Dong Hyun Kim, Surabhi MadhvapathyClaire Liu, Da Som Yang, Yoonseok Park, Ryan Caldwell, Anthony Banks, Shuai Xu, Yonggang Huang, Stefania Fatone, John A. Rogers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Precise form-fitting of prosthetic sockets is important for the comfort and well-being of persons with limb amputations. Capabilities for continuous monitoring of pressure and temperature at the skin-prosthesis interface can be valuable in the fitting process and in monitoring for the development of dangerous regions of increased pressure and temperature as limb volume changes during daily activities. Conventional pressure transducers and temperature sensors cannot provide comfortable, irritation-free measurements because of their relatively rigid construction and requirements for wired interfaces to external data acquisition hardware. Here, we introduce a millimeter-scale pressure sensor that adopts a soft, three-dimensional design that integrates into a thin, flexible battery-free, wireless platform with a built-in temperature sensor to allow operation in a noninvasive, imperceptible fashion directly at the skin-prosthesis interface. The sensor system mounts on the surface of the skin of the residual limb, in single or multiple locations of interest. A wireless reader module attached to the outside of the prosthetic socket wirelessly provides power to the sensor and wirelessly receives data from it, for continuous long-range transmission to a standard consumer electronic device such as a smartphone or tablet computer. Characterization of both the sensor and the system, together with theoretical analysis of the key responses, illustrates linear, accurate responses and the ability to address the entire range of relevant pressures and to capture skin temperature accurately, both in a continuous mode. Clinical application in two prosthesis users demonstrates the functionality and feasibility of this soft, wireless system.

Original languageEnglish (US)
Article numbereabc4327
JournalScience translational medicine
Volume12
Issue number574
DOIs
StatePublished - Dec 16 2020

ASJC Scopus subject areas

  • Medicine(all)

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