Noninvasive hypovolemia monitor
First Claim
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1. 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.
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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.
796 Citations
17 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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; andan output providing at least one of an audible indication and a visual indication to one of a display and additional instrumentation. - View Dependent Claims (11, 12, 13, 14, 15, 16)
- 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
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17. A hypovolemia monitor comprising:
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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.
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Specification