Physiological parameter tracking system
First Claim
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1. A physiological parameter tracking system comprising:
- 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, wherein the first and second intensity signal components are at least partially based on a pulse of the pulsing blood;
a reference parameter calculator configured to output a reference parameter responsive to said physiological signal;
a slow parameter calculator configured to output a slow parameter responsive to said physiological signal according to an update command; and
a tracking function calculator configured to output a physiological measurement output responsive to said reference parameter and said slow parameter.
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Abstract
A physiological parameter tracking system generates a reference parameter and a slowly varying parameter responsive to a physiological signal input. The slowly varying parameter is generated according to an update command. A physiological measurement output is provided that is responsive to a tracking function of the reference parameter and the slowly varying parameter.
839 Citations
19 Claims
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1. 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, wherein the first and second intensity signal components are at least partially based on a pulse of the pulsing blood; a reference parameter calculator configured to output a reference parameter responsive to said physiological signal; a slow parameter calculator configured to output a slow parameter responsive to said physiological signal according to an update command; and a tracking function calculator configured to output a physiological measurement output responsive to said reference parameter and said slow parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A physiological parameter tracking method comprising the steps of:
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inputting a physiological signal; calculating a reference parameter from said signal; defining an update command; tracking said reference parameter according to said update command; and outputting a physiological measurement responsive to said tracking step, wherein said defining step comprises the substeps of; indicating one of a sample period and a tracking period for calculating a slow parameter response to said signal; and indicating a hold period for maintaining a previous calculation of said slow parameter. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A physiological parameter tracking method comprising the steps of:
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providing a physiological signal; calculating arterial oxygen saturation from said signal; calculating a slowly varying parameter during a first period; holding said slowly varying parameter during a second period; and outputting a physiological measurement responsive to said arterial oxygen saturation and said slowly varying parameter. - View Dependent Claims (16, 17, 18, 19)
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Specification