Electromagnetic compatibility of medical electronic equipment

1. The concept of electromagnetic compatibility (EMC)

Electromagnetic Compatibility (EMC) refers to a state in which various electrical devices can work together without degradation of performance under conditions of limited space, time, and spectrum resources. In fact, EMC is the coexistence capability of a device or system in an electromagnetic environment, and any device or system should be undisturbed and not interfere with other devices. An ideally designed electronic device or system should not radiate any unwanted energy and should not be affected by any unwanted energy.

With the development of modern science and technology, the number and types of electronic devices continue to increase, and the space electromagnetic wave frequency band continues to expand, making the electromagnetic environment increasingly complex. In this complex electromagnetic environment, the electronic system may be affected by electromagnetic interference and deviate from the normal working state, and may even be in a paralyzed state. In 1994 the medical equipment made a strong electromagnetic field research topics in the field may encounter a variety of different environments America Winchester analysis and engineering centers, medical electronic equipment may be found at any time in various sizes surrounded by electromagnetic field , subject to large electromagnetic field field radiation. Strengthening the electromagnetic compatibility research of medical electronic equipment, improving the anti-interference ability of equipment, and minimizing the potential electromagnetic interference risk is a serious problem facing us.

2. The need to improve the electromagnetic compatibility of medical electronic equipment

It turns out that in the electromagnetic environment, the harm caused by electromagnetic interference is various, and the troublesome phenomenon is caused by light, such as the deterioration of the call quality caused by the interference of the mobile phone signal to the fixed telephone, and the seriousness will be serious. affect production. Due to the importance of medical electronics in terms of diagnosis and treatment, the impact of electromagnetic interference on medical electronic devices is directly related to the patient's personal safety. With the small, highly sensitive and intelligent implementation of medical and rehabilitation equipment, they are more susceptible to electromagnetic interference. Electromagnetic interference will make the performance of diagnostic instruments with poor electromagnetic compatibility worse, providing doctors with medical information such as distorted data, waveforms and images. Doctors can't make correct diagnoses, and they can't do effective treatment. If the inspection and analysis instrument is inaccurate, the analysis result is wrong; the electrophysiological monitoring instrument is faulty, the output waveform is distorted; the ECG is malfunctioning, the alarm device is not working properly; the breathing circulator and the cardiac monitoring device are suddenly stopped; the imaging diagnostic device is faulty, not only Correct and reliable diagnosis cannot be made, and catheter and interventional procedures cannot be located, resulting in surgical failure and the like. In 2000, when a hospital in Japan rescued an elderly patient with an infusion, the infusion pump was out of control by the radio transmission of the mobile phone and stopped the infusion.

In 1998, wireless medical remote monitoring equipment used by two hospitals in Texas in the United States was interrupted and stopped working. A patient with a pacemaker installed in Guangzhou, when the phone was used to make a call, the pacemaker was disturbed and did not work properly, and almost lost his life. In the United States, a person with an electric control prosthesis installed a high-voltage line while driving a motorcycle, and the electric prosthesis was disturbed and malfunctioned, causing a car crash. It can be seen that it is imperative for medical electronic equipment designers, manufacturers and users to carry out electromagnetic compatibility research, strengthen electromagnetic compatibility management, improve electromagnetic compatibility of medical electronic equipment, and reduce the risk of electromagnetic interference.

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