Study of Electromagnetic Interference with Medical Engineering Equipment

医疗工程设备电磁干扰研究

基本信息

批准号：
04557118
负责人：
KISHIMOTO Seiichi
金额：
$ 3.07万
依托单位：
Kochi National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

We had studied the Electromagnetic Interference (EMI) with the electrocardiograph (ECG) in case of using an electric scalpel, which is a recent problem in medical operation rooms and is a current issue Japanese Association for Operating Room Technology. We pointed out that the noise induced on the AC-line and the noise radiated from an electric scalpel to ECG can be measured by spectrum analyzer or oscilloscope. As a result, it proved that EMI occurs in a wide frequency range on the ECG electrode cord while an electric scalpel is being operated. And EMI on the ECG proved to be induced through the ECG electrode cord. The noise induced on the ECG electrode cord indicates a special performance curve in case of operation both for cutting and for coagulation. Therefore, we made a proposal for the way of suppressing EMI on the ECG.It is that a low-pass filter is added between the ECG electrode code and the ECG transmitter. We have noticed that the origin of EMI's noise on the ECG occurs in a much lower frequency than 1kHz. We inspected these articles and the characteristic- of electric performance curves which were determined to 1kHz for the cut-off frequency. We suggest an added filter's circuit which accommodates a clamp circuit and a limited circuit. Furthermore, the cut-off frequency should be given at the lower frequency from 200Hz through 1kHz, because the spectrum of physical signals of ECG is even lower than about 30Hz except DC.Therefore, they are much smaller than EMI level occurring at the same frequency. As a result, we proposed DSP filter, which has the real-time operation.

我们已经使用电磁仪（ECG）研究了电磁干扰（EMI），如果使用电感手术刀，这是医疗操作室的最新问题，是当前的日本日本手术室技术协会。我们指出，可以通过Spectrum Analyzer或示波器来测量AC线上诱导的噪声以及从电感手术刀到ECG的噪声。结果，事实证明，在操作电动手术刀时，EMI发生在ECG电极绳上的频率范围内。 ECG上的EMI被证明是通过ECG电极线引起的。在ECG电极绳上引起的噪声表明在操作进行切割和凝结的情况下，具有特殊的性能曲线。因此，我们提出了在ECG上抑制EMI的方法。这是在ECG电极代码和ECG发射器之间添加了低通滤波器。我们已经注意到，EMI噪声在ECG上的起源的起源比1KHz低得多。我们检查了这些文章和电性能曲线的特征，这些曲线被确定为1KHz的截止频率。我们建议一个添加的过滤器电路，该电路可容纳夹具电路和有限的电路。此外，截止频率应在从200Hz到1KHz的较低频率下给出，因为ECG的物理信号频谱甚至低于DC，但它们比DC以外的大约30Hz。因此，它们比在相同频率下发生的EMI级别小得多。结果，我们提出了具有实时操作的DSP滤波器。