Hemodynamics-based monitoring and evaluation of a respiratory condition
First Claim
1. A counter-implemented method for assessment of a respiratory condition of a subject, the method comprising:
- (a) acquiring from the subject a temporally varying hemodynamic waveform signal related to blood flow in a tissue of the subject, and generating a representative cycle indicative of blood flow during a cardiac cycle therefrom;
(b) deriving from the representative cycle an evaluation of blood carbon dioxide (CO2) of the subject by configuring a processing circuitry for;
generating a derivative cycle by computing a time derivative of the representative cycle;
determining key points and features in the derivative cycle; and
determining a CO2 level from the key points and features determined in the derivative cycle;
wherein determining key points and features in the derivative cycle comprises determining a first point of maximum and determining a temporal distance between a first point and a second point;
(c) acquiring from the subject at least one more signal relating to the respiratory or cardiovascular condition of the subject; and
(d) determining the respiratory condition of the subject based on the blood CO2, the at least one more signal and a relationship between the blood CO2 and the at least one more signal.
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Accused Products
Abstract
Assessment of a respiratory condition of a subject, by acquiring a temporally varying hemodynamic waveform signal related to blood flow in a tissue; deriving from the hemodynamic waveform signal an evaluation of blood CO2; acquiring at least one more signal; and determining the medical condition based on the blood CO2 and the at least one more signal. A device for performing the assessment may include an implement disposable on the subject'"'"'s skin and structured to acquire a temporally varying hemodynamic waveform signal and derive from the signal a blood CO2 value or a close approximation thereof; an oximeter disposable on the subject'"'"'s skin and structured to provide an oxygen saturation value of the blood of the subject or a close approximation thereof; and an apparatus structured to evaluate the medical condition of the subject based on the blood CO2 and oxygen saturation or close approximations thereof.
38 Citations
22 Claims
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1. A counter-implemented method for assessment of a respiratory condition of a subject, the method comprising:
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(a) acquiring from the subject a temporally varying hemodynamic waveform signal related to blood flow in a tissue of the subject, and generating a representative cycle indicative of blood flow during a cardiac cycle therefrom; (b) deriving from the representative cycle an evaluation of blood carbon dioxide (CO2) of the subject by configuring a processing circuitry for; generating a derivative cycle by computing a time derivative of the representative cycle; determining key points and features in the derivative cycle; and determining a CO2 level from the key points and features determined in the derivative cycle; wherein determining key points and features in the derivative cycle comprises determining a first point of maximum and determining a temporal distance between a first point and a second point; (c) acquiring from the subject at least one more signal relating to the respiratory or cardiovascular condition of the subject; and (d) determining the respiratory condition of the subject based on the blood CO2, the at least one more signal and a relationship between the blood CO2 and the at least one more signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for evaluating a respiratory condition of a subject, the device comprising:
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(a) an implement disposable on the subject'"'"'s skin comprising a processing circuitry, and structured to acquire a temporally varying hemodynamic waveform signal, generate therefrom a representative cycle indicative of blood flow during a cardiac cycle and derive from the representative cycle a blood CO2 value of the subject or a close approximation thereof by configuring a processing circuitry for; generating a derivative cycle by computing a time derivative of the representative cycle; determining key points and features in the derivative cycle; and determining a CO2 level from the key points and features determined in the derivative cycle; wherein determining key points and features in the derivative cycle comprises determining a first point of maximum and determining a temporal distance between a first point and a second point; (b) an oximeter disposable on the subject'"'"'s skin and structured to provide an oxygen saturation value of the blood of the subject or a close approximation thereof; and (c) an apparatus structured to evaluate the respiratory condition of the subject based on the blood CO2, oxygen saturation of the blood of the subject or close approximations thereof, and a relationship between the blood CO2 and the oxygen saturation of the blood. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification