Apparatus and method for noninvasive blood pressure measurement
First Claim
1. A blood pressure monitor for measuring a patient'"'"'s blood pressure, comprising:
- memory means for storing reference features representative of blood pressure from a population of reference patients;
means for periodically obtaining calibration blood pressure values from the patient, said calibration blood pressure values representing the patient'"'"'s absolute blood pressure;
means for noninvasively obtaining blood pressure pulses from the patient;
processing means for processing said blood pressure pulses to obtain processed features representative of said blood pressure pulses;
comparing means for comparing said processed features with said reference features to provide comparison signals representative of the comparison of said processed features with said reference features; and
scaling means responsive to said calibration blood pressure values and said blood pressure pulses for scaling said comparison signals to provide the patient'"'"'s true blood pressure.
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Abstract
A blood pressure monitor for determining a patient'"'"'s blood pressure comprises a processor attached to a first input device for receiving an initial input representing the patient'"'"'s absolute blood pressure, and a noninvasive sensor attached to the patient for measuring at least one physiological function. The processor executes a procedure for evaluating the initial input and the sensed physiological function to determine the patient'"'"'s blood pressure. A method for determining a patient'"'"'s blood pressure comprises the steps of storing an initial input representing a patient'"'"'s absolute blood pressure, noninvasively sensing at least one of the patient'"'"'s physiological functions, and evaluating the initial input and the sensed input to determine the patient'"'"'s blood pressure. The present invention can also be used to analyze and track other physiological variables such as vascular wall compliance, changes in the strength of ventricular contractions, changes in vascular resistance, changes in fluid volume, changes in cardiac output, myocardial contractility and other related factors.
1190 Citations
30 Claims
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1. A blood pressure monitor for measuring a patient'"'"'s blood pressure, comprising:
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memory means for storing reference features representative of blood pressure from a population of reference patients; means for periodically obtaining calibration blood pressure values from the patient, said calibration blood pressure values representing the patient'"'"'s absolute blood pressure; means for noninvasively obtaining blood pressure pulses from the patient; processing means for processing said blood pressure pulses to obtain processed features representative of said blood pressure pulses; comparing means for comparing said processed features with said reference features to provide comparison signals representative of the comparison of said processed features with said reference features; and scaling means responsive to said calibration blood pressure values and said blood pressure pulses for scaling said comparison signals to provide the patient'"'"'s true blood pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of determining a patient'"'"'s blood pressure comprising the steps of:
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storing reference features representative of blood pressure from a population of reference patients; periodically obtaining calibration blood pressure values from the patient, said calibration blood pressure values representing the patient'"'"'s absolute blood pressure; noninvasively obtaining blood pressure pulses from the patient; processing said blood pressure pulses to obtain processed features representative of said blood pressure pulses; comparing said processed features with said reference features to provide comparison signals representative of the comparison of said processed features with said reference features; and scaling said comparison signals with respect to said calibration blood pressure values and said blood pressure pulses to provide the patient'"'"'s true blood pressure. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A monitor for measuring a waveform representing a patient'"'"'s physiological function, said monitor comprising:
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memory means for storing reference features representative of reference waveforms from a population of reference patients, said reference waveforms being representative of the reference patients'"'"' physiological function; means for periodically obtaining a calibration waveform from the patient representative of the patient'"'"'s physiological function; means for obtaining a waveform representative of the patient'"'"'s physiological function; processing means for processing said obtained waveform to obtain processed features; comparing means for comparing said processed features with said reference features to provide a comparison signal; and means responsive to said calibration waveform and said obtained waveform for scaling the comparison signal to provide a signal representative of the patient'"'"'s physiological function. - View Dependent Claims (22, 23, 24, 25)
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26. A method of monitoring a patient'"'"'s physiological function, comprising the steps of:
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storing reference features representative of reference waveforms from a population of reference patients, said reference waveforms being representative of the reference patients'"'"' physiological function; periodically obtaining a calibration waveform from the patient, said calibration waveform being representative of the patient'"'"'s physiological function; obtaining a waveform representative of the patient'"'"'s physiological function; processing said obtained waveform to obtain processed features; comparing said processed features with said reference features to provide a comparison signal; and scaling the comparison signal with respect to the calibration waveform and the obtained waveform to provide a signal representative of the patient'"'"'s physiological function. - View Dependent Claims (27, 28, 29, 30)
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Specification