Patent ID: 8308647
Filing Date: 2012-11-13
Classification: A61B

Abstract:
1. A method of monitoring blood pressure using a blood pressure monitor, the monitor including a blood pressure cuff, the method comprising: obtaining pressure data comprising an oscillatory component and a transient baseline effects component, wherein obtaining pressure data comprises steps of inflating the blood pressure cuff to a user selectable target pressure; deflating the pressure in the blood pressure cuff in a stepwise manner by a predetermined pressure amount, identifying at each pressure step in a first sequence of alternate steps of the cuff pressure variation the occurrence of multiple oscillometric pulses, identifying at each pressure step in a second sequence of alternate steps of the cuff pressure variation the occurrence of a single oscillometric pulse and predicting the termination of the deflation of the blood pressure cuff; constructing a waveform of the pressure data using a processor; selecting with the processor a plurality of data points acquired from the waveform of the pressure data; generating a non-linear transient baseline effects model with the processor based on the plurality of data points; implementing the non-linear transient baseline effects model with the processor to at least partially deduct the transient baseline effects component from the pressure data such that substantially only the oscillatory component remains; and generating an estimate of a blood pressure parameter with the processor based on the oscillatory component of the pressure data, wherein the removal of the transient baseline effects component from the pressure data eliminates a potential source of error and thereby enhances accuracy of the estimated blood pressure parameter.