System and method for determining stroke volume of a patient
AssigneeCovidien LP
InventorsPaul Stanley Addison, James Nicholas Watson
Life of this patent
Estimating the term…
Abstract
A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time.
Claims19
-20. (canceled)
A method, comprising:
- receiving a photoplethysmogram (PPG) signal from a PPG sensor via a monitor comprising a processor, wherein the PPG sensor is configured to be secured to a skin surface of a patient, and wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue and one or more detectors configured to detect an amount of the light from the tissue, and wherein the PPG signal comprises a primary peak separated from a trailing peak by a dichrotic notch;
- analyzing the PPG signal via the processor to determine an inverse gradient of an upslope of the primary peak of the PPG signal;
- and
- calculating a stroke volume via the processor based on the inverse gradient of the upslope of the primary peak of the PPG signal.
A method, comprising:
- receiving a photoplethysmogram (PPG) signal from a PPG sensor via a monitor comprising a processor, wherein the PPG sensor is configured to be secured to a skin surface of a patient, and wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue and one or more detectors configured to detect an amount of the light from the tissue, and wherein the PPG signal comprises one or more primary peaks;
- calculating a heart rate based on a frequency of or a time interval between the one or more primary peaks in the PPG signal;
- determining an inverse gradient of an upstroke of a primary peak of the PPG signal;
- calculating a stroke volume based at least in part on the inverse gradient;
- calculating a cardiac output based at least in part on the stroke volume and the heart rate;
- and
- displaying the cardiac output, the stroke volume, the heart rate, or a combination thereof, on a display.
Dependencies are inferred from the claim text.