Estimation And Removal Of The Stepped Deflation Artefact (Sda) In Oscillometric Blood Pressure Measurement

A new method to detect the blood pressure pulsation signal in oscillometric blood pressure measurement using stepped deflation method was developed. In stepped deflation method, morphology of the artefact signal changes much by bleed valve switching scenario. Various types of interference caused by the bleed valve switching are analyzed. The Adaptive Impulse Correlated Filter (AICF) was applied to remove the stepped deflation artefact (SDA). This AICF is performed using a parametric method which uses Finite Impulse Response (FIR) structure. The method is implemented using a specially designed acquisition system for this research. The analysis showed that amplitude and power of artefact increased with pulse-width of the bleed valve control pulse. The removal of artefact was almost accomplished without reducing the information in the blood pressure pulsation signal.