Parameter compensated physiological monitor
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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Abstract
A monitor has a primary input from which a spectral characteristic of a tissue site can be derived. The monitor also has a secondary input from which at least one parameter can be determined. A compensation relationship of the spectral characteristic, the parameter and a compensated physiological measurement is determined. A processor is configured to output the compensated physiological measurement in response to the primary input and the secondary input utilizing the compensation relationship.
1007 Citations
13 Claims
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1. A monitor comprising:
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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. - View Dependent Claims (2, 3)
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4. A monitor comprising:
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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 wherein said spectral characteristic has a dependence on said parameter; and a processor configured to output a compensated physiological measurement in response to a primary input and said secondary input utilizing a relationship between said spectral characteristic and said at least one parameter and said compensated physiological measurement; wherein said compensation relationship comprises; calibration data relating said spectral characteristic to an uncompensated physiological measurement; a look-up table having at least said spectral characteristic and said at least one parameter as an input and providing said compensated measurement as an output according to said calibration data; and wherein said at least one parameter is a carboxyhemoglobin concentration and said look up table distinguishes carboxyhemoglobin from oxyhemoglobin.
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5. A monitor comprising:
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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 wherein said spectral characteristic has a dependence on said parameter; and a processor configured to output a compensated physiological measurement in response to said primary input and said secondary input utilizing a relationship between said spectral characteristic and said at least one parameter and said compensated physiological measurement; wherein said compensation relationship comprises; calibration data representing a plurality of wavelength-dependent compensation calibration curves, each of said compensation calibration curves relating said spectral characteristic to said compensated physiological measurement; a look-up table having said spectral characteristic as an input and providing as an output said compensated physiological measurement according to said compensation calibration curves; and a wavelength determination in response to said at least one parameter so as to select a sensor wavelength and a corresponding one of said compensation calibration curves.
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6. A monitoring method comprising the steps of:
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inputting a sensor signal responsive to a spectral characteristic of a tissue site; deriving a physiological measurement from said characteristic; obtaining a parameter, wherein said physiological measurement has a dependency on said parameter; determining a relationship between said spectral characteristic and said parameter that accounts for said dependency; compensating said physiological measurement for said parameter utilizing said relationship; and displaying said physiological measurement; wherein said compensating step comprises the substeps of; storing baseline calibration data; modifying said baseline calibration data according to said parameter so as to provide modified calibration data; and looking-up said physiological measurement from said modified calibration data according to said spectral characteristic; and wherein said physiological measurement provides an SpO2 value and said parameter is a manually input SaO2 value, said modifying substep comprising the further steps of; comparing said SpO2 value to said SaO2 value so as to determine a difference; and determining said modified calibration data so as to reduce said difference.
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7. A monitoring method comprising the steps of:
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inputting a sensor signal responsive to a spectral characteristic of a tissue site; deriving a physiological measurement from said characteristic; obtaining a parameter, wherein said physiological measurement has a dependency on said parameter; determining a relationship between said spectral characteristic and said parameter that accounts for said dependency; compensating said physiological measurement for said parameter utilizing said relationship; and displaying said physiological measurement; wherein said compensating step comprises the substeps of; storing baseline calibration data; looking-up said compensated physiological measurement from said calibration data according to said spectral characteristic and said parameter; and wherein said parameter is a hemoglobin constituent measurement and said looking-up comprises the substeps of; distinguishing said hemoglobin constituent from oxyhemoglobin and reduced hemoglobin; and providing an adjusted oxygen saturation measurement according to said distinguishing substep.
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8. A monitoring method comprising the steps of;
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inputting a sensor signal responsive to a spectral characteristic of a tissue site; deriving a physiological measurement from said characteristic; obtaining a parameter, wherein said physiological measurement has a dependency on said parameter; determining a relationship between said spectral characteristic and said parameter that accounts for said dependency; compensating said physiological measurement for said parameter utilizing said relationship; wherein said compensating step comprises the substeps of; storing wavelength-dependent calibration data; determining a wavelength according to at least one of said parameter and said physiological measurement; selecting an active portion of said calibration data according to said wavelength; adjusting a sensor so that said spectral characteristic corresponds to said wavelength; looking-up said physiological measurement from said active portion of said calibration data according to said spectral characteristic; and displaying said physiological measurement. - View Dependent Claims (9, 10)
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11. A monitor comprising:
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a primary input means for determining a spectral characteristic associated with a tissue site; a secondary input means for determining a parameter that is relevant to measuring oxygen saturation at said tissue site; and a compensation relationship means for relating said spectral characteristic, said parameter and an oxygen saturation measurement; wherein said compensation relationship comprises a means for modifying a sensor wavelength and for selecting corresponding wavelength dependent calibration data.
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12. A monitor comprising:
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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 relationship between said spectral characteristic and said at least one parameter and said compensated physiological measurement; wherein said compensation relationship comprises a sensitivity control.
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13. A monitoring method comprising the steps of;
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receiving a sensor signal responsive to a physiological parameter of a tissue site; deriving a physiological indication of said physiological parameter; obtaining a parameter indication, wherein said physiological indication has a dependency on said parameter indication; determining a relationship between said physiological indication and said parameter indication that accounts for said dependency; determining a measurement of said physiological parameter utilizing said relationship; wherein said relationship comprises a sensitivity control; and displaying said measurements.
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Specification