Noninvasive hypovolemia monitor
AssigneeMasimo Corporation
InventorMassi E. Kiani
Life of this patent
Estimating the term…
Abstract
A hypovolemia monitor comprises a plethysmograph input responsive to light intensity after absorption by fleshy tissue. A measurement of respiration-induced variation in the input is made. The measurement is normalized and converted into a hypovolemia parameter. An audible or visual indication of hypovolemia is provided, based upon the hypovolemia parameter.
Claims17
A method of monitoring a hypovolemia parameter of a patient with electronic oximetry monitoring circuitry configured to noninvasively and electronically monitor the patient, the method comprising the steps of:
- inputting a plethysmograph responsive to an output from a noninvasive oximetry sensor applied to said patient, said output responsive to light intensity after absorption by fleshy tissue;
- electronically measuring a respiration-induced variation in said input;
- electronically normalizing said measurement;
- electronically converting said normalized measurement into a numeric value indicating a blood volume level wherein said value indicates hypovolemia;
- and
- providing at least one of an audible indication and a visual indication of said value to a caregiver of said patient.
A hypovolemia monitor comprising one or more processors programmed to include a variation function having a sensor input and generating a variation parameter, said sensor input responsive to light intensity after absorption by fleshy tissue, said variation parameter providing a measure of respiration-induced cyclical variation in said sensor input;
- the one or more processor also programmed to include a normalization function applied to said variation parameter so as to generate a normalized variation parameter responsive to an average value of said sensor input;
- and the one or more processor programmed to include a conversion function applied to said normalized variation parameter so as to generate a numeric value indicating a blood volume level wherein said value indicates hypovolemia;
- and
- an output providing at least one of an audible indication and a visual indication to one of a display and additional instrumentation.
A hypovolemia monitor comprising:
- a variation means for measuring a magnitude of respiration-induced cyclical variations in an input plethysmograph;
- a normalization means for normalizing said magnitude relative to a DC value of said plethysmograph;
- and
- a conversion means for translating said normalized magnitude into a numeric value indicating a blood volume level wherein said value indicates hypovolemia.
Dependencies are inferred from the claim text.