Non-invasive intravascular volume index monitor
AssigneeMasimo Corporation
InventorsPaul Jansen, Michael O'Reilly
Life of this patent
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Abstract
A non-invasive electronic patient monitor tracks one or more physiological parameters of a patient, such as intravascular volume index (IVI), extravascular volume index (EVI), total hemoglobin (SpHb), impedance, and/or weight. The patient monitor determines if one or more of the physiological parameters are within a predetermined range. The patient monitor activates an alarm if one or more of the physiological parameters are outside the predetermined range and indicates a patient can be experiencing edema and/or heart failure, or sepsis.
Claims11
A non-invasive multi-parameter patient monitoring system configured to detect edema for a patient, the non-invasive multi-parameter patient monitoring system comprising:
- a sensor having at least one emitter and an associated detector configured to attach to a tissue site, said detector providing a detector signal responsive to an intensity of energy from said emitter after it has passed through said tissue site;
- and
- a patient monitor comprising:
- a sensor interface configured to receive said detector signal from said sensor;
- and
- a processor configured to:
- determine a plurality of total hemoglobin (SpHb) values over a time period based at least in part on a plurality of detector signals received over the time period;
- determine a plurality of intravascular volume index (IVI) levels of a patient over the time period based at least in part on the plurality of determined SpHb value;
- determine a patient-specific IVI threshold based at least in part on the determined plurality of IVI levels;
- determine a subsequent IVI level based at least in part on a SpHb value determined subsequent to the plurality of SpHb values;
- and
- detect and/or monitor a progress of edema based at least in part on a determination that the subsequent WI level does not satisfy the determined patient-specific IVI threshold.
A method for detecting and/or monitoring progression of edema for a patient, the method comprising:
- receiving data at a non-invasive multi-parameter patient monitor, wherein the data is obtained by detecting light from a light emitting element after the light has been attenuated by tissue;
- determining a plurality of total hemoglobin (SpHb) values over a time period based at least in part on the received data;
- determining a plurality of IVI levels over the time period using the non-invasive multi-parameter patient monitor based at least in part on the plurality of determined SpHb values;
- determine a patient-specific IVI threshold based at least in part on the determined plurality of IVI levels;
- determine a subsequent IVI level based at least in part on a SpHb value determined subsequent to the plurality of SpHb values;
- detecting and/or monitoring a progress of edema based at least in part on a determination that the subsequent IVI level does not satisfy the determined patient-specific IVI threshold.
A non-invasive multi-parameter patient monitor configured to detect and/or measure progression of edema, the non-invasive multi-parameter patient monitor comprising:
- a sensor interface configured to receive a signal from a sensor, wherein the signal is responsive to an intensity of energy from an emitter after it has passed through a tissue site and the signal is indicative of intravascular volume index (WI) levels at the tissue site;
- a processor configured to:
- calculate a plurality of total hemoglobin (SpHb) values over a time period based at least in part on a plurality of signals received over the time period;
- determine a plurality of IVI levels of a patient over the time period based at least in part on the plurality of SpHb values;
- determine a patient-specific IVI threshold based at least in part on the determined plurality of IVI levels;
- determine a subsequent IVI level based at least in part on a SpHb value determined subsequent to the plurality of SpHb values;
- and
- activate an alert based at least in part on a determination that the subsequent IVI level satisfies the determined patient-specific IVI threshold.
A method for detecting and/or monitoring progression of edema using a non-invasive multi-parameter patient monitor, the method comprising:
- emitting light of at least two different wavelengths from a light emitting element;
- detecting light from the light emitting element after the light has been attenuated by tissue;
- measuring a plurality of intravascular volume index (IVI) levels of a patient over a time period based at least in part on a plurality of total hemoglobin (SpHb) values determined over the time period from the detected light using a non-invasive multi-parameter patient monitor;
- determining a patient-specific IVI threshold based at least in part on the measured plurality of IVI levels;
- determining a subsequent IVI level based at least in part a SpHb value determined subsequent to the plurality of SpHb values;
- detecting and/or monitoring a progress of edema based at least in part on a determination that the subsequent IVI level does not satisfy the determined patient-specific IVI threshold;
- and
- alerting a user of the detection and/or progression of edema based at least in part on a determination that the subsequent IVI level satisfies the determined patient-specific IVI threshold.
Dependencies are inferred from the claim text.