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Oversampling pulse oximeter

  • US 6,748,253 B2
  • Filed: 05/24/2002
  • Issued: 06/08/2004
  • Est. Priority Date: 12/17/1999
  • Status: Expired due to Term
First Claim
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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 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, said drive system thereby defining a multichannel modulation waveform wherein said first and second sources are pulsed in a non-alternating fashion to define a non-alternating multiplexed optical signal;

    a detector for receiving said non-alternating multiplexed optical signal and providing a non-alternating multiplexed detector signal representative of said received non-alternating multiplexed optical signal;

    a digital sampler, operatively associated with said detector, for providing multiple digital values based on said non-alternating multiplexed detector signal corresponding to a single cycle state, said single cycle state being one of a single high output period and a single low output period of one of said first and second sources; and

    a processor for using said multiple digital values in performing processing steps related to determining an oxygen saturation related value.

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