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Parameter compensated physiological monitor

  • US 7,142,901 B2
  • Filed: 11/14/2003
  • Issued: 11/28/2006
  • Est. Priority Date: 09/25/2002
  • Status: Active Grant
First Claim
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1. A monitor comprising:

  • a primary input from which a spectral characteristic of a tissue site is derivable;

    a secondary input from which at least one parameter is determinable; and

    a processor configured to output a compensated physiological measurement in response to said primary input and said secondary input utilizing a compensation relationship between said spectral characteristic and said at least one parameter and said compensated physiological measurement;

    wherein said compensation relationship comprises;

    baseline calibration data relating said spectral characteristic to an uncompensated physiological measurement;

    modified calibration data generated from a modification of said baseline calibration data in response to said at least one parameter; and

    a look-up table having sold spectral characteristic as an input and providing said compensated physiological measurement as an output according to said calibration data;

    wherein said at least one parameter is a blood gas measurement and said compensation relationship further comprises;

    a comparison of said uncompensated physiological measurement with said blood gas measurement;

    a sensitivity control; and

    modification rules responsive to said comparison and said sensitivity control, said modification rules determining said modification.

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