Interference and anti-interference, medical electronic equipment in the signal detection and attack
Before the article begins, imagine that you have a pair of ears, you can listen to the faint sound that ordinary people can't hear, but if you are in a noisy vegetable market, all kinds of selling sounds come and go, under this interference, your downwind ears Can you still achieve the desired results? In fact, medical electronic equipment is also facing the above-mentioned problems, such as electrocardiographs, monitors, ultrasonic diagnostic instruments or nuclear magnetic resonance instruments, which are directly in contact with human body equipment, especially instruments for detecting human bioelectrical signals. The human bioelectrical signal is very weak. When it is disturbed, it will be misdiagnosed by superimposing a distortion similar to some lesions on the detection results (such as waveforms, graphics, and images). Some can also cause micro-shocks, and in serious cases, life is at risk. If it is a medical instrument with a computer system, when the peak interference amplitude in the common mode interference reaches 2V ~ 50V, the time lasts for a few microseconds, can cause computer logic errors, information loss and so on. Medical electronic devices extract bioelectrical signals (including ECG, EEG, EMG, EEG, galvanic, membrane electrical signals, etc.) in the human body, and these signals are relatively weak. In the process of extraction, amplification, and display, Subject to different interferences, and there are many reasons for interference. It may be the interference inside the machine, for example, the power supply inside the machine or the interference caused by the poor signal path shielding, or external interference, such as high-frequency electric knife, X-ray machine, short-wave therapy machine and other high power around the patient. High frequency interference caused by physiotherapy equipment, etc. In the anti-jamming aspect of medical electronic equipment, if we only consider the hardware level and try to eliminate the influence of external interference on medical signals, there are too many factors to consider, not only when designing medical equipment , we must strictly consider the problem of signal shielding. Moreover, in the daily use of the hospital, it is necessary to avoid external interference and mutual interference between the devices. The practitioners find that in most cases, only the hardware method can not solve the problem, and the combination of hardware and software can create an optimal solution. . It is understood that a high-tech company in Shenzhen, Mansenberg, has been doing research and development in the field of weak signal extraction. Professor Zhang Tongsheng, the chief scientist of the company, led the team to develop a variety of algorithms to solve the clinical signal interference problem. The interference and anti-interference of medical instruments is always a headache. On the one hand, medical electronic instruments are susceptible to interference, and on the other hand, interference sources are ubiquitous, and it is too costly and difficult to solve only from the source. In this way, Mansenberg's Pre-Sig Detection provides a new low-cost and efficient way to prevent interference from medical electronic devices. We also hope that more and more technological inventions can be applied to the market faster, providing more effective protection against the interference of medical electronic equipment. Reference materials: [1]Xu Kuirui. Analysis of signal interference interference in electronic medical equipment[J]. China Medical Equipment, 2003, 18(1): 37-37. [2] Li Guiliang, Yan Qingshan. Electromagnetic interference protection of medical electronic instruments [J]. China Medical Equipment, 1999 (6): 65-65. ZHANGJIAGANG DINSHENGLIN TRADING CO.,LTD , https://www.dslhouse.com