Optical device
First Claim
Patent Images
1. A method for monitoring oxygenation of blood, comprising the steps of:
- transmitting light containing a plurality of wavelengths into blood;
measuring a remitted spectrum over the plurality of wavelengths;
calculating a measured blood absorption spectrum from the remitted spectrum;
estimating local rates of change in the measured blood absorption spectrum at a plurality of the wavelengths, including at least one isobestic wavelength; and
,calculating an estimate of SO2 as a function of absolute values of the local rates of change of the measured blood absorption spectrum.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for monitoring oxygenation of blood includes the steps of transmitting light containing a plurality of wavelengths into blood and measuring a remitted spectrum over the plurality of-wavelengths. A measured blood absorption spectrum is then calculated from the remitted spectrum and local rates of change in the measured blood absorption spectrum are estimated at a plurality of the wavelengths, including at least one isobestic wavelength. An estimate of blood oxygen saturation (SO2) is calculated as a function of absolute values of the local rates of change of the measured blood absorption spectrum.
102 Citations
4 Claims
-
1. A method for monitoring oxygenation of blood, comprising the steps of:
-
transmitting light containing a plurality of wavelengths into blood; measuring a remitted spectrum over the plurality of wavelengths; calculating a measured blood absorption spectrum from the remitted spectrum; estimating local rates of change in the measured blood absorption spectrum at a plurality of the wavelengths, including at least one isobestic wavelength; and
,calculating an estimate of SO2 as a function of absolute values of the local rates of change of the measured blood absorption spectrum. - View Dependent Claims (2, 3, 4)
-
Specification