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引言用于诊断的标准心电图需要十二个导联。但在多数监控应用中只用一个导联(三个电极)就足够了。下面是一些监控应用实例:加强护理和手术室中的ECG监控器、Holter监控器和更复杂的早搏监控器、运动心电图以及生物电遥测。各种监控器都希望尽可能少用些电极,这样可以减小电极成本,减少病人身上的接触点。特别值得注意的是,在取消了地电极以后能够消除由于漏电流引起的触电危险。典型的监控结构使用两个有效电极作为差分输入,一个电极作为公共端或接地端。因为差分放大器可以做到高共模抑制比(CMRR)和高输入阻抗,所以这一技术得到了普遍采用。大大减小了干扰。单端输入或不接地系统的缺点是不能
Introduction The standard ECG for diagnosis requires twelve leads. However, it is sufficient to use only one lead (three electrodes) in most monitoring applications. Here are some examples of monitoring applications: ECG monitors in intensive care and operating theaters, Holter monitors and more sophisticated premature monitors, exercise ECGs, and bioelectric telemetry. Various monitors hope to use as few electrodes as possible, which can reduce electrode costs and reduce patient contact points. Of particular note is the elimination of the ground electrode to eliminate the risk of electric shock due to leakage currents. A typical monitoring architecture uses two active electrodes as differential inputs and one electrode as a common or ground. This technique is commonly used because of its high common-mode rejection ratio (CMRR) and high input impedance. Greatly reduce the interference. The disadvantage of a single-ended input or ungrounded system is that it can not