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Closed-loop non-invasive oxygen saturation control system

  • US 5,365,922 A
  • Filed: 03/19/1991
  • Issued: 11/22/1994
  • Est. Priority Date: 03/19/1991
  • Status: Expired due to Term
First Claim
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1. An adaptive controller for delivering a fractional amount of oxygen to a patient, said controller comprising:

  • oximeter means coupled by a non-invasive sensor to said patient for measuring blood hemoglobin saturation in the patient, said oximeter generating a plurality of blood hemoglobin saturation output signal values over a given period of time, sequentially representative of said blood hemoglobin saturation;

    means for generating a running average of said blood hemoglobin saturation output values;

    means for generating pseudo-output signals that are a function of said running average;

    processing means including means for identifying possibly invalid output signal values and being responsive to said blood hemoglobin saturation output signal values for evaluating a plurality of said blood hemoglobin saturation output signal values and, based on said evaluation, providing a processed output signal;

    means for substituting respective pseudo-output signals for each of said possibly invalid output signal values thereby forming a sequence of valid output signals.

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