Ueno Akinori, Akabane Yasunao, Kato Tsuyoshi, Hoshino Hiroshi, Kataoka Sachiyo, Ishiyama Yoji
Department of Electronic and Computer Engineering, Tokyo Denki University, Ishizaka, Hatoyama-machi, Saitama 350-0394, Japan.
IEEE Trans Biomed Eng. 2007 Apr;54(4):759-66. doi: 10.1109/TBME.2006.889201.
A method for obtaining electrocardiographic potential through thin cloth inserted between the measuring electrodes and the skin of a subject's dorsal surface when lying supine has been proposed. The method is based on capacitive coupling involving the electrode, the cloth, and the skin. Examination of a pilot device which employed the method revealed the following: (1) In spite of the gain attenuation in the high frequency region, the proposed method was considered useful for monitoring electrogardiogram (ECG) for nondiagnostic purpose. (2) The method was able to yield a stable ECG from a subject at rest for at least 7 h, and there was no significant adverse effect of long-term measurement on the quality of the signal obtained. (3) Electrode area was the factor that had most influence on the signal, compared with other factors such as cloth thickness and coupling pressure, but could be reduced to 10 cm2 for heart rate detection. (4) Input capacitance of the device was assumed to be the dominant factor for the gain attenuation in the high frequency region, and should be reduced with a view to diagnostic use. Although there is still room for improvement in terms of practical use, the proposed method appears promising for application to bedding as a noninvasive and awareness-free method for ECG monitoring.
有人提出了一种方法，当受试者仰卧时，通过插入测量电极与背部皮肤之间的薄布来获取心电图电位。该方法基于涉及电极、布料和皮肤的电容耦合。对采用该方法的试验装置进行测试后发现如下情况：（1）尽管在高频区域存在增益衰减，但该方法被认为对于非诊断目的的心电图（ECG）监测是有用的。（2）该方法能够从静息受试者获取至少7小时的稳定心电图，并且长期测量对所获信号质量没有显著不利影响。（3）与布料厚度和耦合压力等其他因素相比，电极面积对信号影响最大，但对于心率检测，电极面积可减小至10平方厘米。（4）该装置的输入电容被认为是高频区域增益衰减的主要因素，为了用于诊断，应减小输入电容。尽管在实际应用方面仍有改进空间，但所提出的方法作为一种用于心电图监测的无创且无需受试者感知的方法，在应用于床上用品方面似乎很有前景。
