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. 2023 Jul 17;7(1):32. doi: 10.1038/s41528-023-00265-0

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Image of a wireless device being adaptively 3D printed onto a human hand, allowing for unrestricted movement in the workspace (left) and image of the LED in the printed device being powered by a wireless power transmission system. Reprinted with permission from McAlpine et al.¹⁸. Copyright 2018 WILEY-VCH. b Process of patterning silver ink onto the skin using an adhesive stencil, followed by a coiled design patterned onto the index finger. Reprinted with permission from Khine et al.²⁰. Copyright 2020 WILEY-VCH. c Schematic of the multiloop antenna (left). The electrical bridges between the terminals are indicated by red lines. The LEDs are located on the outer terminals. An example of an LED-resonator attached to the wrist is shown, powered by a device with near field communication (NFC) capabilities (right). Reprinted with permission from Khine et al.²⁰. Copyright 2020 WILEY-VCH. d Image of a blood oxygen saturation measurement device that consists of one red LED and one infrared LED, as well as a photodiode, on the fingertip (left). Pulse rate and blood oxygen saturation levels before and after an exercise in which subjects swing their legs upward are plotted (right). Reprinted with permission from Cheng et al.²¹. Copyright 2020 WILEY-VCH.