An improved Method to continuously monitor the Electrode-Skin Impedance during Bioelectric Measurements

Author

Degen, T. ; Loeliger, T.

Author_Institution

Univ. of Appl. Sci. Rapperswil, Rapperswil

fYear

2007

fDate

22-26 Aug. 2007

Firstpage

6294

Lastpage

6297

Abstract

In bioelectric recordings the electrode-skin impedance mismatch reduces the common mode rejection ratio (CMRR) of the amplifier. For this reason, the impedance of each individual electrode-skin contact is usually measured prior to a recording. The measurement circuit itself degrades the CMRR and is switched off during the bioelectric recording. In this work we present a new method that allows to monitor the electrode-skin impedance in a continuous way without reducing the CMRR of the amplifier. The new method is based on an additional common mode signal which is superimposed on the bioelectric signal.

Keywords

amplifiers; bioelectric potentials; electric impedance measurement; electrocardiography; patient monitoring; skin; amplifier; bioelectric measurements; common mode rejection ratio; common mode signal; electrode-skin impedance monitoring; Bioelectric phenomena; Circuits; Differential amplifiers; Electrocardiography; Electrodes; Frequency; Impedance measurement; Monitoring; Skin; Voltage; Amplifiers, Electronic; Artifacts; Electric Impedance; Electrodes; Electrodiagnosis; Equipment Design; Equipment Failure Analysis; Humans; Reproducibility of Results; Sensitivity and Specificity; Skin Physiological Phenomena;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE

Conference_Location

Lyon

ISSN

1557-170X

Print_ISBN

978-1-4244-0787-3

Type

conf

DOI

10.1109/IEMBS.2007.4353794

Filename

4353794