Parameter compensated physiological monitor
First Claim
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1. A physiological monitor comprising:
- an optical sensor providing a first sensor signal responsive to a plurality of wavelengths of optical radiation after attenuation by pulsatile blood flowing within a tissue site of a patient;
a non-optical sensor providing a second sensor signal corresponding to the patient;
a processor configured to derive a spectral characteristic of the tissue site from the first sensor signal;
calibration data relating the spectral characteristic to a blood gas parameter of the patient; and
a correction applied to the calibration data in response to the second sensor signal.
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Abstract
A monitor has an optical input from which a spectral characteristic can be derived. The monitor also has a non-optical input from which a parameter can be determined. A compensation relationship is determined for the spectral characteristic based on the parameter. A physiological measurement is determined based on the spectral characteristic and the compensation relationship.
121 Citations
24 Claims
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1. A physiological monitor comprising:
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an optical sensor providing a first sensor signal responsive to a plurality of wavelengths of optical radiation after attenuation by pulsatile blood flowing within a tissue site of a patient;
a non-optical sensor providing a second sensor signal corresponding to the patient;
a processor configured to derive a spectral characteristic of the tissue site from the first sensor signal;
calibration data relating the spectral characteristic to a blood gas parameter of the patient; and
a correction applied to the calibration data in response to the second sensor signal. - View Dependent Claims (2, 3)
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4. A physiological monitor comprising:
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a primary input responsive to optical properties of a tissue site of a patient;
a characteristic of the tissue site derived from the primary input;
a calibration curve relating the characteristic to a blood gas parameter for the patient;
a blood gas value derived from the primary input and the calibration curve;
a secondary input responsive to non-optical properties corresponding to the patient; and
a compensation applied to at least one of the calibration curve and the blood gas value in response to the secondary input so as to derive a compensated blood gas value that is more accurate than the blood gas value. - View Dependent Claims (5, 6, 7)
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8. A physiological monitoring method comprising:
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generating an optical measurement at a tissue site having pulsatile blood flow;
defining calibration data relating the optical measurement to a blood gas parameter corresponding to the pulsatile blood flow;
calculating the optical measurement and the calibration data with a processor so as to generate a blood gas value corresponding to the blood gas parameter;
providing a non-optical measurement corresponding to the tissue site; and
correcting at least one of the calibration data and the blood gas value according to the non-optical measurement. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A physiological monitoring method comprising:
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generating a non-invasive measurement at a tissue site of a patient;
defining calibration data relating the non-invasive measurement to a blood gas parameter;
calculating with a processor a blood gas value corresponding to the non-invasive measurement;
providing an invasive measurement of the patient;
compensating the blood gas value according to the invasive measurement. - View Dependent Claims (16, 17, 18)
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19. A physiological monitor comprising:
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an optical sensor means for providing a tissue site spectral characteristic for a patient;
a non-optical input means for providing a compensation parameter for the patient;
a calibration means for relating the spectral characteristic to an uncompensated blood gas parameter; and
a correction means responsive to the compensation parameter for generating a compensated blood gas parameter. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification