皮肤-电极阻抗建模与干电极心电贴系统研究_毕业论文.pdf
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2023-10-27
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Abstract
III
Abstract
With the continuous development of the social economy, great changes have taken
place in people's lives, and unhealthy lifestyles have led to the cardiovascular disease
becoming the primary disease threatening human health. Cardiac diseases have short-
term and sudden characteristics, the traditional short-term ECG monitoring is easy to
miss abnormal ECG, while clinical long-term dynamic ECG monitoring has high cost
and imbalance between supply and demand, its popularity and application are low.
Traditional disposable Ag/AgCl wet electrodes will reduce the signal-to-noise ratio of
ECG signals in long-term ECG monitoring due to the reduction of gel moisture, and
some patients are allergic to wet gels.
The application of traditional dry electrodes to
wearable devices has serious problems of baseline drift and motion artifacts. There are
insufficient research on impedance modeling of wet and dry electrodes and pressure
testing at low frequency. In view of the above problems, the paper establishes the skin-
electrode interface impedance circuit model and electrode pressure test and designs an
ECG monitoring system based on the flexible dry electrode to realize long-term
dynamic monitoring of human ECG.
The main research content and work of the paper:
(1) The skin-electrode impedance comparison experiments and electrode drying
experiments were carried out for flexible dry electrodes and disposable Ag/AgCl wet
electrodes of 1~1000 Hz, the experimental results show that the skin-electrode
impedance of the flexible dry electrode is close to that of the disposable Ag/AgCl wet
electrode, and the overall impedance change of the flexible dry electrode after drying
is small, demonstrates the superior performance of flexible dry electrodes.
(2) The skin-electrode impedance circuit model of wet and dry electrodes is
established, and the important determinants of the impedance of wet and dry electrodes
are analyzed in the parallel equivalent capacitance and equivalent resistance formed by
the epidermis layer and the electrode interface layer. The variation trend of absolute
value, imaginary part value and the equivalent capacitance value of the skin-electrode
impedance of four types of electrodes at different frequencies and different pressures
are studied. The experimental results show that the indicators of dry electrodes are more
sensitive to pressure changes than wet electrodes. The pressure test experiment verifies
the wet and dry electrode impedance circuit models established in this paper.
(3) Aiming at the defect that the reduction of the moisture of the disposable
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