A New Noise Reduction Method for Oscillometric Blood Pressure

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1、30thAnnualInternationalIEEEEMBSConferenceVancouver,BritishColumbia,Canada,August20-24,2008ANewNoiseReductionMethodforOscillometricBloodPressureMeasurementHyun-SeokChoi,Hyoun-SeokMyoung,Hyo-KiLee,Ho-DongParkandKyoung-JoungLeeoscillationtobaseline[3]oruseslinearinterpolation[4].Abstract—Inthispaper,an

2、ewnoisereductionmethodwasproposedforoscillometricbloodpressuremeasurement.TheThereforethereexistsapossibilityforlosingtheoscillationproposedmethodusesacapacitivesensorandanadaptivefilterinformationiftheoscillationoverlapswiththenoise.Thelosstominimizebloodpressuremeasurementerror.Noisesuchasoftheosc

3、illationinformationwouldcausethebloodpressureundesiredexternalpressureappliedtocuffwasfocusedon.measurementerror.Threetypesofthedistortedoscillationsignals(nooverlap,non-consecutiveoverlap,consecutiveoverlapbetweenthenoiseInthispaper,themethodusingacapacitancesensorandanandtheoscillation)wereusedtoc

4、omparetheconventionaladaptivefilterwasproposedtominimizethebloodpressuremethodusinglinearinterpolationandtheproposedmethodmeasurementerror.Thecapacitancesensoraimstodetecttheusingtheadaptivefilter.Theproposedmethodoutperformeddistortedoscillation,andtheadaptivefilterplaysaroleintheconventionalmethod

5、inthecaseofconsecutiveoverlaprestorethedistortedoscillation.betweenthenoiseandtheoscillation.Theproposedmethodcouldbeusefulformeasuringbloodpressureinsuchanoisyenvironmentthatthesubjectisbeingtransported.II.METHODSA.TheproposedhardwaresystemI.INTRODUCTIONFig.1showsblockdiagramoftheproposedhardwareBL

6、OODpressureisanimportantsignaltoevaluatesystemcomprisingofcapacitivesensormodule,pressurecardiovascularsystem.Thereareanauscultatorysensormodule,andtransmissionmodule.Thecapacitivemeasurementandanoscillometricmeasurementtomeasuresensormoduleacquiresavariationofcapacitancethebloodpressureinvasively.T

7、heformerandthelattermakesynchronouswiththenoisesuchastheundesiredexternaluseofkorotkoffsoundandoscillationrespectively.Thepressureappliedtothecuff.Thepressuresensormodulekorotkoffsoundoriginatesfromtu