Patent ID: 8195263
Filing Date: 2012-06-05
Classification: A61B

Abstract:
1. A method of measuring a physiological parameter, comprising: obtaining a first signal corresponding to a first wavelength of light passing through a tissue, wherein the first wavelength is in the near infrared region of the spectrum, and wherein light at the first wavelength is primarily absorbed by hemoglobin; obtaining a second signal corresponding to a second wavelength of light passing through the tissue, wherein the second wavelength is in the near infrared region of the spectrum, and wherein light at the second wavelength is primarily absorbed by hemoglobin; obtaining a third signal corresponding to a third wavelength of light passing through the tissue, wherein the third wavelength is in the near infrared region of the spectrum, and wherein light at the third wavelength is primarily absorbed by water; and determining a value for oxygen saturation of the tissue based on the first signal and the second signal by utilizing the third signal for noise correction.