Minimization of artifact using adaptive digital filter during the oscillometric blood pressure measurement

Artifacts caused during the oscillometric blood pressure measurement can degrade the quality of data measured. In this paper, the stepped deflation artifact(SDA) and motion artifact have been dealt with. The former and the latter are due to the bleed valve switching and cuff movements, respectively. The adaptive impulse correlated filter (AICF) was applied to remove the stepped deflation artifact. This AICF is performed using a parametric method which use Finite Impulse Response(FIR) structure. A capacitive sensor was utilized in order to minimize the motion artifact caused by cuff movements. A control signal formed from the capacitance data with respect to the motion artifact was applied to the adaptive digital filter. The removal of artifact was worked almost perfectly without reducing the information in the blood pressure pulsation signal.