The new device uses sound waves to gather blood pressure data from blood vessels, monitoring the response with ultrasound. The new technique, called resonance sonomanometry, holds the promise to enable better vital-sign monitoring at home, in hospitals, and possibly even in remote locations.
Solving a decades-old problem, a multidisciplinary team of Caltech researchers has figured out a method to noninvasively and continually measure blood pressure anywhere on the body with next to no disruption to the patient. A device based on the new technique holds the promise to enable better vital-sign monitoring at home, in hospitals, and possibly even in remote locations where resources are limited.
Most of us have experienced the cuff-style measurement of blood pressure. A nurse, doctor, or machine inflates a cuff that fits around the upper arm until blood can no longer flow, and then slowly releases the air from the cuff while listening for the sound that blood makes as it once again begins to flow. The pressure in the cuff at that point corresponds to the blood pressure in the patient's arteries.
Eventually, Brinley says their device could replace blood pressure cuffs as well."Blood pressure cuffs only take one measurement as often as you run the cuff, so if you're asking patients to monitor their blood pressure at home, they have to know how to use the device, they have to put it on, and they have to be motivated to record the information, and I would say a majority of patients do not do that," says Brinley Rajagopal.
This resonance frequency can be measured with ultrasound, providing a measure of blood pressure. This measurement requires three parameters -- a measurement of the artery's radius, the thickness of the artery's walls, and the tension or energy in the skin of the artery.
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