Wearable photoacoustic watch for humans

Ting Zhang; Heng Guo; Weizhi Qi; Lei Xi; Lei Xi

doi:10.1364/OL.514238

Optics Letters
Vol. 49,
Issue 6,
pp. 1524-1527
(2024)
•https://doi.org/10.1364/OL.514238

Wearable photoacoustic watch for humans

Ting Zhang, Heng Guo, Weizhi Qi, and Lei Xi

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Ting Zhang, Heng Guo, Weizhi Qi, and Lei Xi, "Wearable photoacoustic watch for humans," Opt. Lett. 49, 1524-1527 (2024)

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Abstract

Longitudinal detection of hemodynamic changes based on wearable devices is imperative for monitoring human healthcare. Photoacoustic effect is extremely sensitive to variations in hemoglobin. Therefore, wearable photoacoustic devices are apt to monitor human healthcare via the observation of hemodynamics. However, the bulky system and difficulties in miniaturizing and optimizing the imaging interface restrict the development of wearable photoacoustic devices for human use. In this study, we developed a wearable photoacoustic watch with a fully integrated system in a backpack that has a size of 450 mm × 300 mm × 200 mm and an affordable weight of 7 kg for an adult to wear. The watch has a size of 43 mm × 30 mm × 24 mm, weighs 40 g, and features a lateral resolution of 8.7 µm, a field of view (FOV) of 3 mm in diameter, and a motorized adjustable focus for optimizing the imaging plane for different individuals. We recruited volunteers to wear the watch and the backpack and performed in vivo imaging of the vasculatures inside human wrists under the conditions of walking and human cuff occlusion to observe hemodynamic variations during different physiological states. The results suggest that the focus shifting capability of the watch makes it suitable for different individuals, and the compact and stable design of the entire system allows free movements of humans.

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Supplementary Material (2)

Name	Description
Visualization 1	A volunteer performs the vascular imaging of his wrist when wearing the entire system and walking in a room.
Visualization 2	The observed images at the same position during the entire movement of the optical focus.

Data availability

Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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