System and method of determining whether to recalibrate a blood pressure monitor
First Claim
1. A method of determining whether to recalibrate a blood pressure monitor which calculates blood pressure using a calibration signal from a calibration device indicative of an accurate measurement of the blood pressure of a patient and using a continuous signal from a sensor indicative of a continuous noninvasive measurement of one or more attributes of one or more waves propagating along an artery of the patient, the method characterized by:
- approximating a function relating a change in a trigger parameter to a change in a pressure-velocity relationship, wherein the pressure-velocity relationship is used to noninvasively determine the blood pressure of a patient;
calibrating the pressure-velocity relationship using a calibration signal indicative of a first accurate measurement of the blood pressure, and using a continuous signal indicative of a continuous noninvasive measurement of one or more attributes of one or more waves propagating along an artery of a patient;
calculating a first value of the trigger parameter from the continuous signal;
calculating the blood pressure using the pressure-velocity relationship and the continuous signal;
calculating a second value of the trigger parameter from the continuous signal;
calculating a change in the pressure-velocity relationship by applying the pressure-velocity relationship and the first and second values of the trigger parameter to the function; and
when the change in the pressure-velocity relationship exceeds a threshold value, recalibrating the pressure-velocity relationship using the continuous signal and using a calibration signal indicative of a second accurate measurement of the blood pressure.
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Accused Products
Abstract
A monitor for determining a patient'"'"'s physiological parameter includes a calibration device that provides a calibration signal indicative of an accurate measurement of the patient'"'"'s physiological parameter. The monitor also includes a processor, which receives a noninvasive signal from a noninvasive sensor positioned over a blood vessel. The processor uses the calibration signal to calibrate a relationship between the noninvasive signal and a property of the physiological parameter. The processor also determines when to recalibrate the relationship.
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Citations
23 Claims
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1. A method of determining whether to recalibrate a blood pressure monitor which calculates blood pressure using a calibration signal from a calibration device indicative of an accurate measurement of the blood pressure of a patient and using a continuous signal from a sensor indicative of a continuous noninvasive measurement of one or more attributes of one or more waves propagating along an artery of the patient, the method characterized by:
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approximating a function relating a change in a trigger parameter to a change in a pressure-velocity relationship, wherein the pressure-velocity relationship is used to noninvasively determine the blood pressure of a patient;
calibrating the pressure-velocity relationship using a calibration signal indicative of a first accurate measurement of the blood pressure, and using a continuous signal indicative of a continuous noninvasive measurement of one or more attributes of one or more waves propagating along an artery of a patient;
calculating a first value of the trigger parameter from the continuous signal;
calculating the blood pressure using the pressure-velocity relationship and the continuous signal;
calculating a second value of the trigger parameter from the continuous signal;
calculating a change in the pressure-velocity relationship by applying the pressure-velocity relationship and the first and second values of the trigger parameter to the function; and
when the change in the pressure-velocity relationship exceeds a threshold value, recalibrating the pressure-velocity relationship using the continuous signal and using a calibration signal indicative of a second accurate measurement of the blood pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19)
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12. A method of examining the internal consistency of values derived in different ways from several sources to continuously determine the blood pressure of a patient, the method characterized by:
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receiving a calibration signal from a calibration device configured to provide an accurate representation of the blood pressure of a patient;
receiving a continuous signal from a sensor configured to detect one or more attributes of a perturbation of an artery of the patient;
calibrating, with the calibration signal, one or more of a plurality of parameters derived from at least the continuous signal;
calculating the blood pressure of the patient from one or more of the plurality of parameters;
tracking one or more of the a plurality of parameters; and
when the one or more tracked parameters exceed a threshold, recalibrating the one or more calibrated parameters.
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20. A noninvasive blood pressure monitor, characterized by:
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an input calibration signal from a calibration device configured to provide an accurate representation of the blood pressure of a patient;
an input noninvasive sensor signal from a sensor configured to detect one or more attributes of a perturbation of an artery of the patient; and
a processor which determines when to employ the input calibration signal to recalibrate one or more of a plurality of parameters, wherein the processor uses the plurality of parameters and the input noninvasive sensor signal to continuously calculate the blood pressure of the patient. - View Dependent Claims (21, 22, 23)
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Specification