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Methods and apparatus for producing and using lightly filtered photoplethysmograph signals

  • US 8,755,854 B2
  • Filed: 07/31/2009
  • Issued: 06/17/2014
  • Est. Priority Date: 07/31/2009
  • Status: Active Grant
First Claim
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1. Apparatus for monitoring a physiological condition of a patient comprising:

  • photoplethysmograph (“

    PPG”

    ) circuitry configured to obtain a PPG signal from the patient;

    filter circuitry configured to lightly filter the PPG signal to produce a lightly filtered PPG signal; and

    output circuitry configured to provide a visible display of a trace of the lightly filtered PPG signal, thereby making it possible for a clinician user of the apparatus to observe at least some patient physiological condition information contained in the lightly filtered PPG signal.

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