US 5,704,362 AGranted

Method for oscillometric blood pressure determination employing curve fitting

AssigneeJohnson & Johnson Medical, Inc.

InventorsLawrence T. Hersh, Bruce Friedman, Richard Medero

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Abstract

A method of measuring blood pressure where a plurality of oscillometric data values are measured from a subject at a plurality pressure levels, a function curve having the shape of an oscillometric envelope is selected and computational model fit to the data, using the Gauss-Marquardt method of model fitting. Once the curve is model fit, blood pressure is measured using the oscillometric method. Included in the step of model fitting is the step of computing the parameter of the function curve that minimizes the error between the function curve and the data values at the respective pressure levels thereby approximating the oscillometric envelope based upon data values.

Claims14

Dependent claims

A method for measuring the blood pressure of a subject, comprising the steps of:

obtaining from the subject a plurality of oscillometric data values from at least one complex amplitude taken at a plurality of pressure levels;
selecting a function curve having a physiologically-expected shape of an oscillometric envelope, the function curve being defined by at least one parameter;
computationally model fitting the function curve to the plurality of data values by computing the parameter of the function curve that minimizes the error between the function curve and the data values at the respective pressure levels thereby approximating the oscillometric envelope based upon data values;
and
computing a systolic pressure and a diastolic pressure based upon the curve.

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Dependencies are inferred from the claim text.