A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/101, 354/22
A61B 5/02 (2006.01) A61B 5/022 (2006.01) G06F 17/00 (2006.01)
Patent
CA 1187721
APPARATUS AND METHOD FOR MEASURING BLOOD PRESSURE ABSTRACT OF THE DISCLOSURE A blood pressure measuring device is disclosed which uses an inflatable cuff to apply external pressure to a patient's body member. The device detects and measures amplitude of pressure oscilla- tions induced in the cuff by blood flow in the body member as the cuff pressure is decreased in steps from a magnitude above the expected systolic pressure to a magnitude below the expected diastolic blood pressure. The mean arterial blood pressure is measured at the step at which the pressure oscilla- tions reach a maximum. Systolic blood pressure is determined by making a first linear approximation to a plurality of amplitude measurements occurring below the expected systolic pressure and making a second linear approximation to a plurality of points occur- ring above the expected systolic pressure. The syst- olic pressure is calculated by setting the two approximations equal. Diastolic blood pressure is determined by detecting the cuff pressure which results in an equivalent oscillation magnitude to that determined for the systolic pressure.
395072
Beveridge Robert W.
Nunn Donald E.
Bard (c.r.) Inc.
Swabey Ogilvy Renault
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