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Assessing a subject's circulatory system

  • US 8,491,486 B2
  • Filed: 11/17/2009
  • Issued: 07/23/2013
  • Est. Priority Date: 11/17/2008
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • an input interface configured to provide signals from at least two sensors for at least two postures including;

    signals, dependent upon blood presence, from a first sensor when a subject is in a first posture;

    signals, dependent upon blood presence, from the first sensor when the subject is in a second posture;

    signals, dependent upon blood presence, from a second sensor when the subject is in the first posture; and

    signals, dependent upon blood presence from the second sensor when the subject is in the second posture;

    processing circuitry configured to determine and output a metric by combining, according to pre-defined calibration data the provided signals; and

    a memory storing multiple sets of calibration data comprising a set of calibration data for each of a plurality of predetermined standard sequences of different body postures;

    wherein the processing circuitry is configured to determine and output a metric for a particular predetermined standard sequence of different body postures by combining, according to calibration data for the particular predetermined standard sequence of different body postures, the provided signals.

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