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Monitoring physiological parameters based on variations in a photoplethysmographic signal

  • US 7,001,337 B2
  • Filed: 03/02/2004
  • Issued: 02/21/2006
  • Est. Priority Date: 02/22/2002
  • Status: Expired due to Term
First Claim
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1. A method for use in non-invasively monitoring a physiological parameter of a patient, comprising the steps of:

  • obtaining a time-based photoplethysmographic (“

    pleth”

    ) signal that is modulated based on interaction of a transmitted optical signal with blood of said patient, wherein said pleth signal includes at least a first component associated with the operation of the patient'"'"'s respiratory system and a second Mayer wave component associated with the patient'"'"'s autonomic nervous system;

    transforming said time-based pleth signal into a frecquency domain to obtain spectral information including information associated with said first component and said second Mayer wave components;

    processing said spectral information to distinguish an effect associated with one of said first component and second Mayer wave component from an effect associated with the other of said components; and

    using said distinguished effect to monitor said physiological parameter.

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