PHYSIOLOGICAL PARAMETER TRACKING SYSTEM
First Claim
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1. A physiological parameter tracking system comprising:
- a physiological signal having at least first and second intensity signal components received from a light-sensitive detector that detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
a first calculator configured to output a reference parameter responsive to the physiological signal;
a second calculator configured to output an ancillary parameter responsive to the physiological signal;
a third calculator configured to output a slow parameter that is a function of the reference parameter and the ancillary parameter and is slowly varying in time relative to the reference parameter and the ancillary parameter; and
a fourth calculator configured to output a physiological measurement responsive to the reference parameter and the slow parameter.
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Abstract
A physiological parameter tracking system has a reference parameter calculator configured to provide a reference parameter responsive to a physiological signal input. A physiological measurement output is a physiological parameter derived from the physiological signal input during a favorable condition and an estimate of the physiological parameter according to the reference parameter during an unfavorable condition.
98 Citations
13 Claims
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1. A physiological parameter tracking system comprising:
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a physiological signal having at least first and second intensity signal components received from a light-sensitive detector that detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
a first calculator configured to output a reference parameter responsive to the physiological signal;
a second calculator configured to output an ancillary parameter responsive to the physiological signal;
a third calculator configured to output a slow parameter that is a function of the reference parameter and the ancillary parameter and is slowly varying in time relative to the reference parameter and the ancillary parameter; and
a fourth calculator configured to output a physiological measurement responsive to the reference parameter and the slow parameter. - View Dependent Claims (2, 3, 4, 5)
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6. A physiological parameter tracking method comprising the steps of:
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inputting a physiological signal;
deriving a physiological measurement from the physiological signal during a favorable condition;
estimating the physiological measurement during an unfavorable condition; and
outputting a combination of the derived physiological measurement and the estimated physiological measurement. - View Dependent Claims (7, 8, 9, 10)
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11. A physiological parameter tracking system comprising:
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a physiological signal input having at least first and second intensity signal components received from a light-sensitive detector that detects light of at least first and second wavelengths transmitted through body tissue carrying pulsing blood;
a reference parameter calculator configured to output a reference parameter responsive to the physiological signal; and
a physiological measurement means for outputting a physiological parameter derived from the physiological signal input during a favorable condition and estimating the physiological parameter according to the reference parameter during an unfavorable condition. - View Dependent Claims (12, 13)
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Specification