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. 2021 Jan 20;21(3):703. doi: 10.3390/s21030703

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Examples of NFC applications for blood flow sensing. (a) Construction of an NFC-enabled pulse oximeter device. PD, photodetector [51]. (b) Photograph of an NFC device on a fingernail [51]. (c) Results of SpO₂ during a breath-hold test [51]. (d) Top view of an NFC heart rate sensor [52]. (e) Photograph of an NFC device on skin [52]. (f) Biosignal data measured by the device [52]. (g–i) Construction of an NFC heart valve monitoring device [53].