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Wearable blood pressure monitor uses ultrasound to capture a continuous record of blood pressure

Jul. 31, 2024.
1 min. read. 5 Interactions

Continuous, noninvasive blood pressure monitoring of various arteries

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Amara Angelica

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Co-inventor with Ray Kurzweil of patented accessory with cardio sensors

Acoustic stimulation paired with ultrasound imaging reveals resonance properties of an artery. (A) Device placement to measure blood pressure in the carotid artery. (B) Illustration of device operation: Ultrasound transducer (gray probe) is used to generate images of the artery (at bottom). (C) Illustration of resonance sonomanometry (credit: Jimenez et al)

Continuous, noninvasive blood pressure monitoring has been a longtime goal of medicine because of blood pressure’s utility as a metric for clinicians.

However, options have been limited to internally placed arterial catheters or inflatable pressure cuffs, requiring frequent calibration with an inflatable cuff.

Ultrasound-based measurement

Raymond Jimenez and colleagues propose a new method based on “resonance sonomanometry,” in which the artery is stimulated by an acoustic transducer (similar to a medical ultrasound scanner) and the resonant response and dimensions are measured using ultrasound.

Similar to how a guitar string changes pitch as its tension is manipulated, changing circumferential tension (by blood pulses) of the arterial wall changes its resonant frequency through the continuous phases of the cardiac cycle.

The method was tested on humans on the carotid artery in the neck and the axillary, brachial, and femoral arteries. Measurements were compared with those from a blood pressure cuff.

Not limited to an arm

All four sites produced measurements in a single subject that were broadly in line with those obtained from a cuff. Additional testing on the carotid arteries of six volunteers showed promising results, albeit with lower systolic values (predictable, given the carotid being closer to the heart than the brachial artery measured by the cuff).

According to the authors, their proposed device could be worn over any ultrasound-accessible artery, even including the radial (back of arm near hand), where the device could be worn like a watch.

Citation: Jimenez, R., Yurk, D., Dell, S., Rutledge, A. C., Fu, M. K., Dempsey, W. P., Rajagopal, A., & Brinley Rajagopal, A. (2024). Resonance sonomanometry for noninvasive, continuous monitoring of blood pressure. PNAS Nexus, 3(7). https://academic.oup.com/pnasnexus/article/3/7/pgae252/7717708 (open access)

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One thought on “Wearable blood pressure monitor uses ultrasound to capture a continuous record of blood pressure

  1. Great invention

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