Patent ID: 8359079
Filing Date: 2013-01-22
Classification: A61B

Abstract:
1. A non-invasive pulse oximetry system comprising: a controller; a light source coupled to the controller and emitting at least two light signals having distinct wavelengths adapted to be directed at an appendage of a subject; and a light receiver coupled to the controller and adapted to be mounted adjacent to said appendage and which receives said light signals; wherein the controller of the pulse oximetry system derives at least a heart rate value, a blood oxygenation value, a breath rate and a breath distention value from said received light signals, wherein the breath distention value is associated with the height of the blood flow change in the appendage derived from the endpoints of the breathing effort from inhale to exhale, and wherein the system derives the breath rate that is calculated by filtering the received signals in the frequency domain to remove the heart rate component thereof, then reconstructing a time domain breath signal in the absence of the heart rate components and wherein the breath rate is calculated using the reconstructed breath signal.