Paperdoi:10.1109/TBME.2026.3748379
Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026)
IEEE Transactions on Biomedical Engineering
TL;DR
A prototype ring measures absolute BP without cuff calibration or demographics, using the oscillometric cuff principle at the digital arteries. The user varies finger pressure either by ring tightening then hand lowering, or by ring tightening only, guided on a display. The ring has a mechanical actuator that changes its diameter, a PPG sensor, a force sensor and an IMU.
- Form factor: ring
Abstract
ObjectiveRegular blood pressure (BP) monitoring is needed to manage hypertension. However, cuff devices are not readily accessible, and many adults are living with uncontrolled BP. Furthermore, popular wearable cuffless devices typically require calibration with periodic cuff BP measurements or demographic information. A finger worn ring for cuffless BP measurement without such calibration was investigated.MethodsBP ring concepts were conceived based on the oscillometric cuff principle. The user varies their finger pressures similar to a cuff device by performing ring tightening followed by hand lowering or ring tightening only under visual guidance, while the ring obtains oscillometric measurements from the digital arteries for on-demand BP measurement. A prototype device was built to implement the BP ring concepts. The ring included a mechanical actuator to adjust its diameter and a photoplethysmography sensor, force sensor, and inertial measurement unit to make the measurements. The ring is interfaced to a display via a wired data acquisition system to guide the user in performing the ring tightening/hand lowering. An oscillometric algorithm is applied to compute BP from the measurements. The device was tested in 25 volunteers.ResultsThe ring tightening-hand lowering BP measurement could be learned by new users. The device yielded root-mean-square-errors of 7.1 and 6.9 mmHg for systolic and diastolic BP against a validated arm cuff device.ConclusionThis study demonstrates the feasibility of absolute BP monitoring using a finger worn ring.SignificanceThe BP ring concepts could potentially be incorporated in smart rings to help improve hypertension control.
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Cite this paper
Momin, M. A., Wang, S., Jazini, M., Freithaler, M., Hashemkhani, S., Hoover, G. E., Li, Y., Lee, I., Xiong, F., & Mukkamala, R. (2026). Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026). IEEE Transactions on Biomedical Engineering. https://doi.org/10.1109/TBME.2026.3748379
Momin, Md Abdul, Shipeng Wang, Mahdi Jazini, Mark Freithaler, Shahin Hashemkhani, Graham Ethan Hoover, Yuyang Li, Inhee Lee, Feng Xiong, and Ramakrishna Mukkamala. 2026. "Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026)." IEEE Transactions on Biomedical Engineering. https://doi.org/10.1109/TBME.2026.3748379.
Momin, M. A., Wang, S., Jazini, M., Freithaler, M., Hashemkhani, S., Hoover, G. E., Li, Y., Lee, I., Xiong, F. and Mukkamala, R. (2026) 'Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026)', IEEE Transactions on Biomedical Engineering. doi: 10.1109/TBME.2026.3748379.
Momin, Md Abdul, et al. "Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026)." IEEE Transactions on Biomedical Engineering, 2026. https://doi.org/10.1109/TBME.2026.3748379.
M. A. Momin et al., "Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026)," IEEE Transactions on Biomedical Engineering, 2026, doi: 10.1109/TBME.2026.3748379.
@article{momin2026fingerworn,
title = {{Finger-worn ring for on-demand absolute BP via finger oscillometry (Momin, Mukkamala 2026)}},
author = {Momin, Md Abdul and Wang, Shipeng and Jazini, Mahdi and Freithaler, Mark and Hashemkhani, Shahin and Hoover, Graham Ethan and Li, Yuyang and Lee, Inhee and Xiong, Feng and Mukkamala, Ramakrishna},
year = {2026},
journal = {IEEE Transactions on Biomedical Engineering},
doi = {10.1109/TBME.2026.3748379}
}Added to the ChatPPG research hub
