Patent ID: 7062307
Filing Date: 2006-06-13
Classification: A61B

Abstract:
1. A pulse oximeter, comprising: a first source for emitting light having a first spectral content; a second source for emitting light having a second spectral content different than said first spectral content; a drive system for pulsing each of said first and second sources according to first and second non-alternating modulation signals, respectively such that said first and second sources output first and second optical signals, respectively, each of said first and second optical signals including a series of high output periods separated by low output periods; a detector for receiving said first and second optical signals and providing a detector signal representative of said received fist and second optical signals; and a digital sampler, operatively associated with said detector, for providing multiple digital values based on said detector signal corresponding to said series of high output periods and a low output periods of said first and second sources; a phase detector operative to receive said multiple digital values and identify a synchronized time period where said first and second non-alternating modulation signals are synchronized about a common point; and a processor for using said multiple digital values associated with said synchronized time period in performing processing steps related to determining an oxygen saturation related value.