Continuous non-invasive blood pressure measurement apparatus and methods providing automatic recalibration
First Claim
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1. A method for operating a blood pressure measurement system, comprising:
- activating a blood pressure detector to obtain a first blood pressure measurement of a subject;
detecting, by a pulse oximetry sensor, a pulse wave signal from the subject comprising a plurality of individual pulses;
determining, using a processor, a reference parameter of the pulse wave signal proximate the time of the first blood pressure measurement;
storing, using the processor, the reference parameter as a template;
determining, using the processor, a morphology metric of one or more individual pulses of the pulse wave signal, wherein the morphology metric comprises one of an area of the one or more individual pulses, an amplitude of the one or more individual pulses, a shape of the one or more individual pulses, and a time difference of the one or more individual pulses;
quantifying, using the processor, a difference between the morphology metric and the template; and
triggering the blood pressure detector to obtain a second blood pressure measurement of the subject when the difference passes a threshold.
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Abstract
A blood pressure measurement system is configured to perform a calibration automatically when a calibration condition is satisfied. The calibration condition is based upon one or more parameters of pulse waves of a subject. The parameters may include pulse wave area; a time difference between systolic peak and reflected wave peak or dichrotic notch in the pulse wave and a shape of at least a portion of the pulse wave.
217 Citations
17 Claims
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1. A method for operating a blood pressure measurement system, comprising:
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activating a blood pressure detector to obtain a first blood pressure measurement of a subject; detecting, by a pulse oximetry sensor, a pulse wave signal from the subject comprising a plurality of individual pulses; determining, using a processor, a reference parameter of the pulse wave signal proximate the time of the first blood pressure measurement; storing, using the processor, the reference parameter as a template; determining, using the processor, a morphology metric of one or more individual pulses of the pulse wave signal, wherein the morphology metric comprises one of an area of the one or more individual pulses, an amplitude of the one or more individual pulses, a shape of the one or more individual pulses, and a time difference of the one or more individual pulses; quantifying, using the processor, a difference between the morphology metric and the template; and triggering the blood pressure detector to obtain a second blood pressure measurement of the subject when the difference passes a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating a blood pressure measurement system, comprising:
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activating a blood pressure detector to obtain a first blood pressure measurement of a subject; detecting, by a pulse oximetry sensor, a pulsatile signal from the subject, the pulsatile signal comprising a plurality of pulses; determining, using a processor, first and second reference parameters of the pulsatile signal proximate the time of the first blood pressure measurement; determining, using the processor, first and second morphology parameters of the plurality of pulses, wherein each of the first and second morphology metric parameters comprises one of;
an area of the one or more individual pulses, an amplitude of the one or more individual pulses, a shape of the one or more individual pulses, and a time difference of the one or more individual pulses;comparing, using the processor, the first morphology parameter to the first reference parameter, and the second morphology parameter to the second reference parameter; evaluating, using the processor, a new measurement condition based on the comparisons; and when the new measurement condition is satisfied, triggering the blood pressure detector to obtain a second blood pressure measurement of the subject. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for operating a blood pressure measurement system, comprising:
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detecting, using a pulse oximetry sensor, a pulse wave signal of a subject; monitoring, using a processor, a morphology characteristic of the pulse wave signal over time, wherein the morphology characteristic comprises one of an area of a pulse, an amplitude of a pulse, a shape of a portion of a pulse, and a time difference between first and second portions of a pulse; storing, using the processor, a reference characteristic of the pulse wave signal; comparing, using the processor, the monitored characteristic to the reference characteristic; evaluating, using the processor, a new measurement condition based on the comparison; and triggering a blood pressure detector to obtain a blood pressure measurement when the new measurement condition is satisfied.
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Specification