Devices and Methods for Monitoring Directional Blood Flow and Pulse Wave Velocity with Photoplethysmography
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Abstract
Provided according to embodiments of the invention are methods of monitoring the direction of blood flow that include processing with a computer photoplethysmography (PPG) signal streams from a sensor array on a body site of the individual to determine the direction and/or velocity of the blood flow at the body site of the individual. In some embodiments, direction of the blood flow at the body site is determined by the phase difference between at least three PPG signal streams from the sensor array, wherein the at least three PPG signal streams are generated from emissions of the at least three emitters.
27 Citations
32 Claims
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1-27. -27. (canceled)
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28. A PPG sensor comprising:
- an array that comprises at least three emitters and/or an array that comprises at least three detectors, wherein the PPG sensor comprises at least one emitter and at least one detector.
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32. A system for monitoring a subject, comprising:
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a PPG sensor comprising an array that comprises at least three emitters and/or an array the comprises at least three detectors, wherein the PPG sensor has at least one emitter and at least one detector; and a computer in communication with the PPG sensor, wherein the computer processes PPG signal streams from the sensor to determine the direction of blood flow at a body site on which the PPG sensor is secured.
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Specification