Blood pressure measurement apparatus and associated method
First Claim
1. A method of measuring blood pressure, comprising:
- inflating a cuff to gradually increase cuff pressure around an artery having a movable arterial wall;
determining changes in power of the arterial wall motion as the wall stretches and contracts in response to the increasing cuff pressure and a pulsating blood flow through the artery, the power being defined as the product of a velocity of the arterial wall motion and an acceleration of the arterial wall motion; and
comparing the changes in power to a threshold power level to determine diastolic and systolic pressure readings as indicated by the cuff pressure during decreasing cuff pressure.
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Abstract
Using an improved noninvasive blood pressure measuring apparatus, dynamic parameters (like stretching and contracting velocity, acceleration, force, power and energy) of human arterial wall motion against both the lowering and increasing pressure of an occlusive cuff are detected. They can be displayed along with other physiological signals like aortic pressure AP and ECG taken from other instruments through a data receiving unit. Then this apparatus with ECG makes it possible to noninvasively detect some abnormalities between the mechanical and electrical cardiac cycle on heart function. The apparatus also detects systolic (SYS) and diastolic (DIA) pressure while increasing the cuff pressure. The apparatus can also examine a non-local information on blood circulation by simultaneously using a second occlusive cuff. Since this apparatus is capable of acquiring any physiological signal coupled with a commonly practiced noninvasive brachial artery blood pressure measurement, it will be also useful for quick and mass clinical testing.
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Citations
21 Claims
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1. A method of measuring blood pressure, comprising:
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inflating a cuff to gradually increase cuff pressure around an artery having a movable arterial wall; determining changes in power of the arterial wall motion as the wall stretches and contracts in response to the increasing cuff pressure and a pulsating blood flow through the artery, the power being defined as the product of a velocity of the arterial wall motion and an acceleration of the arterial wall motion; and comparing the changes in power to a threshold power level to determine diastolic and systolic pressure readings as indicated by the cuff pressure during decreasing cuff pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for measuring blood pressure, comprising:
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means for inflating a cuff to gradually increase cuff pressure around an artery having a movable arterial wall; means for determining changes in power of the arterial wall motion as the wall stretches and contracts in response to the increasing cuff pressure and a pulsating blood flow through the artery, the power being defined as the product of a velocity of the arterial wall motion and an acceleration of the arterial wall motion; and means for comparing the changes in power to a threshold power level to determine diastolic and systolic pressure readings as indicated by the cuff pressure during decreasing cuff pressure. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of measuring blood pressure comprising:
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applying pressure to an artery having a movable arterial wall; detecting power of the arterial wall motion, the power being defined as the product of a velocity of the arterial wall motion and an acceleration of the arterial wall motion; and determining changes in power of the arterial wall motion to determine diastolic and systolic blood pressure.
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21. An apparatus for measuring blood pressure comprising:
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means for detecting power of an arterial wall motion, the power being defined as the product of a velocity of the arterial wall motion and an acceleration of the arterial wall motion; and means for determining changes in power of the arterial wall motion to determine diastolic and systolic blood pressure.
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Specification