Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 27, 2007
Patent Application Number
11270240
Date Filed
November 8, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
The invention is method and apparatus for determining a physiological characteristic by detecting the intensity of light following tissue absorption at two wavelengths, estimating the pulse amplitude and indexing a calculated physiological characteristic to the estimated pulse amplitude. In one embodiment, the ratio of logarithms of absorbance signal amplitude is indexed to the pulse amplitude to improve the accuracy of arterial oxygen saturation as determined by a pulse oximeter.
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