Continuous non-invasive blood pressure monitoring method and apparatus
First Claim
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1. Apparatus for blood pressure measurement, the apparatus comprising:
- means for measuring a reference blood pressure P0 and determining a corresponding reference time difference, T0, the time difference representing a difference in time between the arrival of corresponding points of first and second pulse signals at first and second locations respectively;
means for obtaining a non-linear function relating blood pressure and time difference for the subject based upon the reference blood pressure and the reference time difference; and
, means for computing an estimated blood pressure, P, at one or more subsequent times, wherein the step for computing the estimated blood pressure includes at least determining a time difference, T, between corresponding points of the first and second pulse signals at the one or more subsequent times and computing the non-linear function of the time difference.
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Abstract
A non-invasive apparatus and method for monitoring the blood pressure of a subject detects a pulse signal at both a first and second location on the subject'"'"'s body The elapsed time between the arrival of corresponding points of the pulse signal at the first and second locations is determined. Blood pressure is related to the elapsed time by relationships such as:
P=a+b ln(T),
where a and b are constants dependent upon the nature of the subject and the signal detecting devices. The system can be calibrated by measuring a single pair of reference blood pressure and corresponding elapsed time
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Citations
22 Claims
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1. Apparatus for blood pressure measurement, the apparatus comprising:
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means for measuring a reference blood pressure P0 and determining a corresponding reference time difference, T0, the time difference representing a difference in time between the arrival of corresponding points of first and second pulse signals at first and second locations respectively;
means for obtaining a non-linear function relating blood pressure and time difference for the subject based upon the reference blood pressure and the reference time difference; and
,means for computing an estimated blood pressure, P, at one or more subsequent times, wherein the step for computing the estimated blood pressure includes at least determining a time difference, T, between corresponding points of the first and second pulse signals at the one or more subsequent times and computing the non-linear function of the time difference.
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2. A method for obtaining a value representing a blood pressure of a subject, the method comprising:
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a step for measuring a reference blood pressure P0 and determining a corresponding reference time difference, T0, the time difference representing a difference in time between the arrival of corresponding points of first and second pulse signals at first and second locations respectively;
a step for obtaining a non-linear function relating blood pressure and time difference for the subject based upon the reference blood pressure and the reference time difference; and
,a step for computing an estimated blood pressure, P, at one or more subsequent times, wherein the step for computing the estimated blood pressure includes at least determining a time difference, T, between corresponding points of the first and second pulse signals at the one or more subsequent times and computing the non-linear function of the time difference. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A program product comprising a medium carrying signals embodying instructions, the instructions capable of being executed by a data processor to provide
means for measuring a reference blood pressure P0 and determining a corresponding reference time difference, T0, the time difference representing a difference in time between the arrival of corresponding points of first and second pulse signals at first and second locations respectively; -
means for obtaining a non-linear function relating blood pressure and time difference for the subject based upon the reference blood pressure and the reference time difference; and
,means for computing an estimated blood pressure, P, at one or more subsequent times, wherein the step for computing the estimated blood pressure includes at least determining a time difference, T, between corresponding points of the first and second pulse signals at the one or more subsequent times and computing the non-linear function of the time difference.
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Specification