一、引言心电图(ECG)监测的一个问题是电极与皮肤的接触。为了获得没有伪迹和高保真度的ECG记录,必须有良好的接触。关于监测电极与皮肤接触状态的电路,文献中几乎没有报导过。在某些商售ECG监测系统中,以通过病人的直流电监测接触状态。正如后面将要讨论的那样,这不是好方法。本文将叙述一个新颖的接触监测电路。而且,简单和可靠性已在该电路的设计中作了最大考虑。在本文的全部讨论中,约定符号Un是随时间变化的电位。二、皮肤——电极接点 ECG监测通常是用置于皮肤表面的电极检测皮肤上的电位,而这种方法所产生的电 I. INTRODUCTION One problem with electrocardiogram (ECG) monitoring is the electrode’s contact with the skin. In order to obtain ECG records without artifacts and high fidelity, there must be good contact. Circuits for monitoring the state of electrode contact with the skin are scarcely reported in the literature. In some commercially available ECG monitoring systems, contact status is monitored by the patient’s DC power. As will be discussed later, this is not a good idea. This article describes a novel contact monitoring circuit. Moreover, simplicity and reliability have been taken into account in the design of this circuit. In the entire discussion herein, the convention symbol Un is the potential over time. Second, the skin - electrode contact ECG monitoring is usually placed on the surface of the skin electrodes to detect the skin potential, and this method of generating electricity