Methods and apparatus for determining breathing effort characteristics measures
First Claim
1. Apparatus for determining a respiratory characteristic of a patient comprising:
- apparatus for coupling to the patient to produce a patient monitor signal containing signal information indicative of effort the patient is exerting to breathe;
first circuitry for extracting from the patient monitor signal a breathing effort signal indicative of the patient'"'"'s exertion of effort in order to breathe; and
second circuitry for;
detecting first and second amplitude features of the effort signal;
determining, using the effort signal, an elapsed time between the first amplitude feature of the effort signal and the second amplitude feature of the effort signal; and
extracting a respiratory characteristic signal for the patient that is based on the elapsed time.
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Accused Products
Abstract
One or more respiratory characteristics of a patient are measured by coupling patient monitor apparatus (e.g., a photoplethysmograph (“PPG”)) to the patient in order to produce a patient monitor signal that includes signal indicia indicative of effort the patient is exerting to breathe. A breathing or respiratory effort signal for the patient is extracted from the patient monitor signal. A respiratory characteristic signal is extracted (at least in part) from the effort signal. This may be done, for example, on the basis of an amplitude feature of the effort signal and a relative time of occurrence of that amplitude feature. Alternatively, the respiratory characteristic signal may be based on a relationship between two amplitude features of the effort signal, with or without regard for specifics of the times of occurrence of those amplitude features. A breath air flow meter may also be coupled to the patient, if desired, in order to produce a flow signal. One or more of the respiratory characteristic measures may also be partly based on the flow signal.
132 Citations
17 Claims
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1. Apparatus for determining a respiratory characteristic of a patient comprising:
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apparatus for coupling to the patient to produce a patient monitor signal containing signal information indicative of effort the patient is exerting to breathe; first circuitry for extracting from the patient monitor signal a breathing effort signal indicative of the patient'"'"'s exertion of effort in order to breathe; and second circuitry for; detecting first and second amplitude features of the effort signal; determining, using the effort signal, an elapsed time between the first amplitude feature of the effort signal and the second amplitude feature of the effort signal; and extracting a respiratory characteristic signal for the patient that is based on the elapsed time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17)
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16. Apparatus for determining a respiratory characteristic of a patient comprising:
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apparatus for coupling to the patient to produce a patient monitor signal containing signal information indicative of effort the patient is exerting to breathe; first circuitry for extracting from the patient monitor signal a breathing effort signal indicative of the patient'"'"'s exertion of effort in order to breathe; and second circuitry for; detecting two amplitude features of the effort signal; determining a ratio of the two amplitude features; extracting from the effort signal a respiratory characteristic signal for the patient based on the ratio.
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Specification