MATEC Web Conf.
Volume 76, 201620th International Conference on Circuits, Systems, Communications and Computers (CSCC 2016)
|Number of page(s)||6|
|Published online||21 October 2016|
An Improved Very Low-Power Electrode Contact Impedance Monitor
1 Dept. of Electronic and Electrical Engineering, Trinity College, University of Dublin, College Green, Dublin 2, Ireland
2 Laerdal Medical AS, P.O. Box 337, Tanke Svilandsgate 30, N-4002 Stavanger, Norway
a Corresponding author: firstname.lastname@example.org
This paper reports the design improvement of a circuit for monitoring the quality of contact of un-gelled stainless steel electrodes with a patient’s skin in the measurement of the ECG. The circuit is intended to be incorporated into a heart rate monitor used prior to and during childbirth to measure the mother’s heart rate. The revised design uses commercially available low-power technology to implement the circuit with a reduction in the power consumption by a factor of 20 over a previous design . The circuit measures the quality of contact of electrode impedances up to 100kΩ and gives a visual indication when the contact impedance of either electrode is above this level. The impedance is measured using a signal injected through the electrodes via the input impedance of the amplifier at a frequency of 5kHz. The resulting signal present at the amplifier input at this frequency is then extracted and processed before threshold detection of the signal level which is used to indicate whether or not the quality of contact of the patient’s fingers with the electrodes is acceptable for the purposes of heart rate measurement.
© The Authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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