SYSTEM AND METHOD FOR DETERMINING STROKE VOLUME OF AN INDIVIDUAL
First Claim
1. A system for determining stroke volume of an individual, the system comprising:
- a skew-determining module configured to calculate a first derivative of photoplethysmogram (PPG) signals of the individual, the first derivative forming a derivative waveform, the skew-determining module configured to determine a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one pulse wave detected from blood flow of the individual in the derivative waveform; and
an analysis module configured to determine a stroke volume of the individual, the stroke volume being a function of the skew metric of the first derivative.
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Accused Products
Abstract
A system for determining stroke volume of an individual. The system includes a skew-determining module that is configured to calculate a first derivative of photoplethysmogram (PPG) signals of the individual. The first derivative forms a derivative waveform. The skew-determining module is configured to determine a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one pulse wave detected from blood flow of the individual in the derivative waveform. The system also includes an analysis module that is configured to determine a stroke volume of the individual. The stroke volume is a function of the skew metric of the first derivative.
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Citations
20 Claims
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1. A system for determining stroke volume of an individual, the system comprising:
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a skew-determining module configured to calculate a first derivative of photoplethysmogram (PPG) signals of the individual, the first derivative forming a derivative waveform, the skew-determining module configured to determine a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one pulse wave detected from blood flow of the individual in the derivative waveform; and an analysis module configured to determine a stroke volume of the individual, the stroke volume being a function of the skew metric of the first derivative. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining stroke volume of an individual, the method comprising:
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acquiring photoplethysmogram (PPG) signals of the individual, the PPG signals corresponding to pulse waves detected from blood flow of the individual; calculating a first derivative of the PPG signals, the first derivative forming a derivative waveform; determining a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one of the pulse waves in the derivative waveform; and determining a stroke volume of the individual, the stroke volume being a function of the skew metric of the first derivative. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A tangible and non-transitory computer readable medium that includes one or more sets of instructions configured to direct a monitor to:
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acquire photoplethysmogram (PPG) signals of the individual, the PPG signals corresponding to pulse waves detected from blood flow of the individual; calculate a first derivative of the PPG signals, the first derivative forming a derivative waveform; determine a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one of the pulse waves in the derivative waveform; and determine a stroke volume of the individual, the stroke volume being a function of the skew metric of the first derivative. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification