Method and electronic medical device for simultaneously measuring an impedance and a biopotential signal

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(11)

EP 2 294 979 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	14.09.2011 Bulletin 2011/37

(43)	Date of publication:
	16.03.2011 Bulletin 2011/11

(21)	Application number: 10152299.3

(22)	Date of filing: 01.02.2010

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International Patent Classification (IPC):

A61B 5/053^(2006.01)
A61B 5/04^(2006.01)
A61B 5/0488^(2006.01)

A61B 5/0402^(2006.01)
A61B 5/0476^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
	Designated Extension States:
	AL BA RS

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Priority:

14.09.2009 US 242299 P

(71)	Applicant: IMEC
	3001 Leuven (BE)

(72)	Inventors:
	Yazicioglu, Refet Firat 3000, Leuven (BE) Kim, Sunyoung 3001, Leuven (BE)

(74)	Representative: Sarlet, Steven Renaat Irène et al
	Gevers Intellectual Property House Holidaystraat 5 1831 Diegem 1831 Diegem (BE)

(54)	Method and electronic medical device for simultaneously measuring an impedance and a biopotential signal

(57) A method and device for continuously and simultaneously measuring an impedance signal and a biopotential signal on a biological subject's skin. The method comprises the steps of: attaching input and output electrodes to the biological subject's skin; applying a predetermined alternating current having a first frequency to the output electrodes for creating an alternating voltage signal over the input electrodes, the first frequency being above a predetermined minimum frequency; measuring an input signal from the input electrodes, the input signal comprising a biopotential signal and the alternating voltage signal; extracting from said input signal the biopotential signal; extracting from said input signal the alternating voltage signal and determining the impedance signal from the alternating voltage signal. The alternating voltage signal is extracted by amplifying and demodulating the input signal using a control signal having a frequency equal to the first frequency of the applied alternating current.