Study on Clinical Applicability of the Fibroptic Pressure Monitoring System during Surgery

当ESU被激活时，ECG和压力监测仪会受到ESU产生的干扰。我们分析了这种情况，以找出三种可能的噪声路径组合中哪一种对噪声问题的贡献最大。第一种是通过交流电源线传导。第二，也是最重要的，是通过病人的传导。为了减少ESU产生的HF干扰，敏感的示波器必须与交流电源线隔离，监测设备的接地阻抗也必须大大增加，从以前的实验获得的结果可以看出。因此，我们提出了光纤ECG、EEG和压力监测仪器，以实现以下目标：（a）高噪声性能，在电外科手术期间提供最高质量的ECG、EEG和压力监测。(b)出色的电气安全性，仅允许患者最小程度地暴露于高频电流引起的烧伤和电击低频电流通过ECG、EEG和压力测量电极流向大地引起的（微或大电击）;因为直接连接到患者的发射器，光纤ECG、EEG和压力监测系统是手术室的理想选择，因为手术室需要高降噪和出色的电气安全性。

When the ESU is activated, the ECG and pressure monitors are exposed to interference generated by the ESU. We analysed this stuation to find which of the three possible noise path combinations contributes the most to the noise problem.Electrosurgical interference occurs in two of the three possible modes. The first is conduction via the AC power line. The second , and most important, is conduction via the patient.To reduce the HF interfernce generated by the ESU, the sensitive preamplifier crircuits must be isolated from the AC power line and the earth impedance of the monitoring device must also be greatly increased, as seen from previous experimentally obtained results. We, therefore, propose the fibreoptic ECG, EEG and pressure monitoring instruments as accomplishing the following:(a) high noise performance which provides maximum quality of ECG, EEG and pressure monitoring during electrosurgery.(b) excellent electrical safety which allows only minimum exposure of patients to burns caused by the flow of high-frequency currents and to electric shock (micro or macro shock) caused by the flow of lowfrequency currents through the ECG, EEG and pressure measururing electrodes to earth; because the transmitter, which is connected directly to the patient, is isolated completely from both the AC power line and the earth an optical fibre.The fribre-optic ECG, EEG and pressure monitoring system is ideal for the operating room where-high noise reduction and excellent electrical safety are indispensable.