Abstract
A capacitive electrocardiography (cECG) technique using a non-invasive ECG measuring technology that does not require direct contact between the sensor and the skin has attracted much interest. The system encounters several challenges when the sensor electrode and subject’s skin are weakly coupled. Because there is no direct physical contact between the subject and any grounding point, there is no discharge path for the built-up electrostatic charge. Subsequently, the electrostatic charge build-up can temporarily contaminate the ECG signal from being clearly visible; a stabilization period (3–15 min) is required for the measurement of a clean, stable ECG signal at low humidity levels (below 55% relative humidity). Therefore, to obtain a clear ECG signal without noise and to reduce the ECG signal stabilization time to within 2 min in a dry ambient environment, we have developed a fabric electrode with embedded polymer (FEEP). The designed hygroscopic FEEP has an embedded superabsorbent polymer layer. The principle of FEEP as a conductive electrode is to provide humidity to the capacitive coupling to ensure strong coupling and to allow for the measurement of a stable, clear biomedical signal. The evaluation results show that hygroscopic FEEP is capable of rapidly measuring high-accuracy ECG signals with a higher SNR ratio.
Highlights
In recent years, coronary heart disease has become the leading cause of death worldwide.Cardiovascular diseases affect stressed, overweight middle-aged men in developed countries, and women and children in low-middle-income countries
We developed a fabric electrode with embedded polymer (FEEP) that takes into account the relative humidity of the environment and sensor electrode characteristics to remove the static charge rapidly and obtain a clear
Our results show that a good quality ECG signal can be recorded with good signal-to-noise ratio (SNR), making this system a very promising non-contact biomedical signal acquisition technology for use in ubiquitous home healthcare applications
Summary
Coronary heart disease has become the leading cause of death worldwide. An electrocardiogram (ECG) measures the electric current generated by the heart muscle during a heartbeat It provides useful diagnostic information about the cardiovascular system and is a strong indicator of several specific physiological and pathological conditions in humans. Noncontact ECG monitoring has the distinct advantage of not requiring direct contact; it can measure biomedical signals through a layer of insulator such as clothes. This property allows for the integration of the measurement system into everyday objects and makes continuous measurement possible without placing constraints on the patients. In non-contact capacitive coupled ECG measurement methods, there is no skin contact; no direct connection can be made between the subject’s body and the sensor electrode. Our results show that a good quality ECG signal can be recorded with good SNR, making this system a very promising non-contact biomedical signal acquisition technology for use in ubiquitous home healthcare applications
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