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Nguyen DT, Zeng Q, Tian X, Chia P, Wu C, Liu Y, Ho JS. Ambient health sensing on passive surfaces using metamaterials. Sci Adv 2024; 10:eadj6613. [PMID: 38181071 PMCID: PMC10776016 DOI: 10.1126/sciadv.adj6613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 12/01/2023] [Indexed: 01/07/2024]
Abstract
Ambient sensors can continuously and unobtrusively monitor a person's health and well-being in everyday settings. Among various sensing modalities, wireless radio-frequency sensors offer exceptional sensitivity, immunity to lighting conditions, and privacy advantages. However, existing wireless sensors are susceptible to environmental interference and unable to capture detailed information from multiple body sites. Here, we present a technique to transform passive surfaces in the environment into highly sensitive and localized health sensors using metamaterials. Leveraging textiles' ubiquity, we engineer metamaterial textiles that mediate near-field interactions between wireless signals and the body for contactless and interference-free sensing. We demonstrate that passive surfaces functionalized by these metamaterials can provide hours-long cardiopulmonary monitoring with accuracy comparable to gold standards. We also show the potential of distributed sensors and machine learning for continuous blood pressure monitoring. Our approach enables passive environmental surfaces to be harnessed for ambient sensing and digital health applications.
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Affiliation(s)
- Dat T. Nguyen
- Integrative Sciences and Engineering Program, National University of Singapore, Singapore 119077, Singapore
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
- Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
| | - Qihang Zeng
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
- Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
| | - Xi Tian
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
- Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
- SIA-NUS Digital Aviation Corporate Laboratory, National University of Singapore, Singapore 117602, Singapore
| | - Patrick Chia
- SIA-NUS Digital Aviation Corporate Laboratory, National University of Singapore, Singapore 117602, Singapore
| | - Changsheng Wu
- Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
- SIA-NUS Digital Aviation Corporate Laboratory, National University of Singapore, Singapore 117602, Singapore
- The N.1 Institute for Health, National University of Singapore, Singapore 117456, Singapore
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Yuxin Liu
- Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
- SIA-NUS Digital Aviation Corporate Laboratory, National University of Singapore, Singapore 117602, Singapore
- Department of Biomedical Engineering, National University of Singapore, Singapore 117583, Singapore
| | - John S. Ho
- Integrative Sciences and Engineering Program, National University of Singapore, Singapore 119077, Singapore
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
- Institute for Health Innovation and Technology, National University of Singapore, Singapore 117599, Singapore
- SIA-NUS Digital Aviation Corporate Laboratory, National University of Singapore, Singapore 117602, Singapore
- The N.1 Institute for Health, National University of Singapore, Singapore 117456, Singapore
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