Method and apparatus for diastolic pressure measurement
First Claim
1. A method for measuring diastolic pressure of a subject comprising the steps ofA. sensing arterial pressure signals with a pressure transducer applied non-intrusively to the subject'"'"'s body,B. applying arterially-constricting pressure to the artery being sensed and changing the applied pressure value over a range of at least sub-diastolic values,C. determining the minimum sub-diastolic value of applied pressure at which the rate of change of the portion of sensed signal corresponding to left ventricle ejection undergoes a progressive change in response to monodirectionally-changing applied pressure, andD. producing a value indicative of diastolic pressure for the subject in response to said determined value of sub-diastolic applied pressure for that subject.
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Abstract
The rate of change in a selected portion of an arterial pressure pulse changes with applied constricting pressure, and the pattern of the change undergoes a progressive transition at a value of constricting pressure that is offset by a fixed amount below the true diastolic value. Diastolic pressure measurement based on this transition examines the rate of change of the arterial pressure pulse as the constricting pressure changes over a range of sub-diastolic values, determines the occurrence of the transition, and identifies the applied pressure at which the transition occurs. The offset pressure is added to the determined value of applied pressure to yield the desired measure of diastolic pressure.
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Citations
22 Claims
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1. A method for measuring diastolic pressure of a subject comprising the steps of
A. sensing arterial pressure signals with a pressure transducer applied non-intrusively to the subject'"'"'s body, B. applying arterially-constricting pressure to the artery being sensed and changing the applied pressure value over a range of at least sub-diastolic values, C. determining the minimum sub-diastolic value of applied pressure at which the rate of change of the portion of sensed signal corresponding to left ventricle ejection undergoes a progressive change in response to monodirectionally-changing applied pressure, and D. producing a value indicative of diastolic pressure for the subject in response to said determined value of sub-diastolic applied pressure for that subject.
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11. A method for measuring diastolic pressure of a subject with the steps of
(i) sensing arterial pressure signals with a pressure transducer applied non-intrusively to the subject'"'"'s body, and (ii) applying arterially-constricting pressure to the artery being sensed and changing the applied pressure monodirectionally over a selected range, said method comprising the further steps of A. identifying the occurrence of a progressive change in the rate of change of the portion of sensed signal corresponding to left ventricle ejection at a value of applied pressure between 20 millimeters of mercury and 125 millimeters of mercury, and B. determining the value of applied pressure at which said progressive change occurs, thereby to determine, at said value of applied pressure, a sub-diastolic pressure which is offset below the diastolic value of the subject by a known amount.
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12. In apparatus for measuring diastolic pressure of a subject in response to arterial pressure signals sensed for each of a succession of arterial pulses under different values of applied arterially-constricting pressure, the combination comprising
A. means for changing the applied pressure over a range of sub-diastolic values, B. means responsive to said sensed pressure signals and to said applied pressure for determining the minimum subdiastolic value of applied pressure at which the rate of change of the portion of sensed signal corresponding to left ventricle ejection undergoes a progressive change as a function of monodirectionally-changing applied pressure, and C. means responsive to said determining means for producing a value indicative of diastolic pressure in response to said determined value of sub-diastolic applied pressure for that subject.
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22. In apparatus for measuring diastolic pressure of a subject in response to arterial pressure signals sensed with a pressure transducer applied non-intrusively to the subject'"'"'s body for each of a succession of arterial pulses produced under different values of applied arterially-constricting pressure and having means for applying arterially-constricting pressure to the artery being sensed and for changing the applied pressure monodirectionally over a selected range, the further combination comprising
A. means for identifying the occurrence of a progressive change in the rate of change of the portion of sensed signal corresponding to left ventricle ejection at a value of applied pressure between 20 millimeters of mercury and 125 millimeters of mercury, and B. means for determining the applied pressure at which said identified progressive change occurs, thereby for determining a sub-diastolic pressure which is offset below the diastolic value of the subject by a known amount.
Specification