An Improved Very Low-Power Electrode Contact Impedance Monitor

  • Martin J Burke
  • Cormac Molloy
  • Helge Fossan
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Publication date
October 2016
Publisher
EDP Sciences

Abstract

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 [1]. 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 el...

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