Methods and apparatus for measuring blood pressure by the...

A - Human Necessities – 61 – B

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A61B 5/022 (2006.01) G06F 17/00 (2006.01)

Patent

CA 2449867

A method and apparatus for measuring blood pressure by the oscillometric technique. The method incorporates variable PIP's (Parameter Identification Point). The method comprises the steps of obtaining a value for the peak amplitude Amax of an oscillometric envelope; determining a cuff pressure, CP, which corresponds in time with Amax, this pressure representing the MAP of the subject; computing a variable value PIPSBP as a function of MAP (Mean Anterial Blood Pressure); performing the calculation Asbp = Amax * PIPSBP to determine a systolic amplitude value Asbp along the oscillometric envelope; and determining the cuff pressure C which corresponds in time to Asbp, this value representing the systolic blood pressure (SBP) of the subject. PIP can be calculated using a piece-wise linear, polynomial, exponential or other function.

L'invention concerne un procédé et un appareil de mesure de la tension artérielle suivant une technique oscillométrique. Le procédé fait intervenir des variables PIP. Le procédé est caractérisé en ce qu'il comprend les étapes ci-après : obtenir une valeur d'amplitude du pic A¿max? d'une enveloppe oscillométrique ; détermination d'une pression sous brassard compressif, CP, correspondant au moment avec A¿max?, cette pression représentant le MAP du sujet ; calculer une variable PIP¿SBP? en fonction de MAP ; effectuer le calcul A¿sbp? = A¿max? * PIP¿SBP? pour déterminer une valeur d'amplitude systolique A¿sbp? le long de l'enveloppe oscillométrique ; et déterminer la pression sous brassard compressif C correspondant au temps de A¿sbp?, cette valeur représentant la tension artérielle systolique (SBP) du sujet. Le PIP peut être calculé au moyen d'une fonction linéaire, polynôme ou exponentielle par échelon, ou d'une autre fonction.

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