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AssigneeBoard of Trustees of Michigan State University
InventorsRamakrishna Mukkamala, Anand Chandrasekhar, Jin-Oh Hahn
Estimating the term…
A system and method is presented for cuff-less blood pressure measurement in a mobile device. A key aspect of this disclosure is the discovery of a new location for blood pressure measurement at the fingertip of a subject and that reflectance-mode photoplethysmography can be used to help make this measurement. Through experiments in human subjects, it was discovered that it is indeed possible to measure systemic blood pressure by having a subject press the fingertip against a reflectance-mode photo-plethysmography-force sensor unit under visual guidance and then compute blood pressure from the resulting variable-amplitude blood volume oscillations and applied pressure via an oscillometric algorithm.
A mobile device, comprising:
A mobile device, comprising:
A mobile device, comprising:
Dependencies are inferred from the claim text.
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Measuring pressure in heart or blood vessels: details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems,…
By applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers: using the oscillometric method
Measuring pulse rate or heart rate: using photoplethysmograph signals, e.g. generated by infrared radiation
Measuring blood flow: using optical means, e.g. infrared light
About 10 years 4 months of term left · ends 3 Mar 2037 (estimated)
The present disclosure relates to a method of cuff-less blood pressure measurements in a mobile device.
Hypertension afflicts about one-fourth of the world's adult population. It is a major risk factor for stroke and heart disease and is therefore a “silent killer”. Hypertension can be treated with lifestyle changes and medication. Medical therapy is associated with a 35-40% reduction in the risk of stroke and a 15-25% reduction in the risk of heart disease. Hence, hypertension management is an archetypical example of preventive, proactive healthcare. However, the detection of high blood pressure (BP) is often missed. An estimated 20% of people with hypertension in the US do not know they have it. Further, BP in known hypertensive patients is often uncontrolled. An estimated 53% of hypertensive patients in the US do not have their BP under control. Hypertension detection and control rates are much worse elsewhere, especially in low resource settings wherein personnel trained in BP measurement and the means for people to have their BP measured are lacking. Hypertension management is complicated by the well-known masked and white coat effects in the clinic and large BP variability amongst few measurements. In fact, ambulatory BP monitoring is now considered the gold standard for the diagnosis of high BP. Ubiquitous BP monitoring technology could improve hypertension detection by providing serial, out-of-clinic measurements in the mass population and could enhance hypertension control by providing continual feedback to the individual patient.
Several methods are available for measuring BP. However, none of these methods offers ubiquitous BP monitoring capabilities.
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
FIG. 1 is a diagram depicting an example embodiment of a mobile device that embodies cuff-less BP measurements;
FIGS. 2A-2C are diagrams depicting an embodiment of the cuff-less blood measurement system on the mobile device;
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
Example embodiments will now be described more fully with reference to the accompanying drawings.
The present invention relates to a reliable method for cuff-less BP monitoring via the oscillometric principle. In conventional oscillometry, an inflatable cuff serves as both an actuator to vary the external pressure of an artery and a sensor to measure this pressure and the resulting variable-amplitude blood volume oscillations in the artery. BP is then estimated from the oscillation amplitudes as a function of the applied pressure (again, the “oscillogram”). The idea of this disclosure is to extend the oscillometric principle for cuff-less monitoring of BP using a smartphone, another mobile device (e.g., PDAs, laptops, tablets, and wearables), and/or possibly an encasing of a mobile device. Note that smartphones, in particular, are readily available even to those in low resource settings.