A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
354/22
A61B 8/04 (2006.01) A61B 5/021 (2006.01) A61B 5/0285 (2006.01)
Patent
CA 2011638
METHOD AND APPARATUS FOR DETERMINING THE ARTERIAL BLOOD PRESSURE IN A NON-INVASIVE MANNER ABSTRACT OF THE DISCLOSURE This method for establishing blood pressure in an artery employs the measurement results from two non-invasive sensors (5, 6) of artery diameter at two closely spaced locations (3, 4) separated by a distance .DELTA.x. The method provides for measuring the time spread .DELTA.t(7) between each pair of diameter measurements and establ- ishing the propagation velocity of the pressure wave (9). Next, this value is compared with an expression (11) of the form c(D)= c(D,.alpha., .beta., .gamma.,...) which takes into account the physical behaviour of the artery. This comparison per- mits one, following adjustment (12) based on a mathematical procedure for minimizing spreads, to calculate the parame- ters .alpha., .beta., .gamma.,... of the relation given hereinabove. By replacing the parameters .alpha.,.beta., .gamma.,... by their values in a relation (10) D(p)= D(p, .alpha.,.beta., .gamma.,...) and in employing the measurement results from a diameter sensor, one may deduce the blood pressure value p(t) at each instant of the cardiac cycle. The blood pressure value together with the corres- ponding value of the artery diameter permit tracing a pres- sure-diameter curve (14) by means of which the mechanical properties of the artery may be measured.
Meister Jean-Jacques
Tardy Yanik
Asulab S.a.
Gowling Lafleur Henderson Llp
Meister Jean-Jacques
Tardy Yanik
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