METHOD AND APPARATUS FOR PRODUCING A CENTRAL PRESSURE WAVEFORM IN AN OSCILLOMETRY BLOOD PRESSURE SYSTEM

WIPO Patent Application WO/2010/082839

A3

A method for estimating an intra-arterial blood pressure waveform, from pressure waveforms obtained from a blood pressure cuff, comprises the steps of a) inflating a blood pressure cuff on a brachial artery of an arm to a pressure at least as great as the diastolic pressure; b) holding the molar amount of fluid in the blood pressure cuff constant; c) sensing a sequence of cuff pressure waveforms associated with the brachial artery that result from at least one cardiac ejection cycle; and d) scaling the cuff pressure waveforms to produce a pseudo- arterial waveform, assuming a nonlinear relationship between the oscillatory pressure Δp0 and the pseudo-arterial pressure p, where the nonlinearity is hyperbolic in form, according to the formula: pi = C1/f(Δp0) + C2 where c1 and c2 are constant relative to Δp0 and pi, and f is a power function, and c1, c2 and f are chosen such that increments in Δp0 at larger values of Δp0 result in smaller increments in pi than equal increments in Δp0 at smaller values of Δp0.

JPS60132705	[Title of the device] Slow speed exhaust valve device
JP6692814	Devices and methods for measuring the physiological characteristics of a subject
JPH0221842	CUFF BAND FOR MEASURING BLOOD PRESSURE

LOWE ANDREW (NZ)

PCT/NZ2009/000281

September 10, 2010

December 10, 2009

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PULSECOR LTD (NZ)
LOWE ANDREW (NZ)

A61B5/02; A61B5/0285

WO2006106439A2	2006-10-12
WO1990011043A1	1990-10-04
WO2008121454A1	2008-10-09
WO2008025053A1	2008-03-06

US20060195034A1	2006-08-31
EP1327415A1	2003-07-16
GB2356251A	2001-05-16

MALLESONS, Stephen Jaques (Bourke Place600 Bourke Stree, Melbourne VIC 3000, AU)

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