Discussion on the anti-electromagnetic interference method of ECG monitor
The principle of the high-frequency electrosurgical knife is to heat the tissue when the high-frequency current generated by the electrode tip of the electrosurgical blade contacts the body, thereby achieving the purpose of cutting the tissue. Compared with traditional mechanical scalpels, electrosurgical knives have the characteristics of fast cutting speed and good hemostasis. The use of electrosurgical knife in clinic can shorten the operation time and reduce complications.
However, the high-frequency electric knife is essentially a variable-frequency transformer, which converts the low-frequency and low-voltage current into high-voltage and high-frequency currents of up to several thousand or even tens of thousands of volts through frequency conversion and power amplification, which inevitably produces strong electromagnetic interference. The ECG monitoring equipment itself is very sensitive, and the monitoring data is easily affected by the electric knife interference.
To solve the electromagnetic interference of high-frequency electric knife to ECG equipment, and to seek solutions from the hardware level, there are generally several ideas. For example, when using an electric knife, the protection system automatically cuts off the input signal of the ECG equipment. The ECG signal is switched back immediately after the knife is stopped, so that the monitor can always display accurate values ​​when it is in operation. Also, the electrocardiographic electrode is placed on the electrical electrode to offset the interference generated by the electrocautery. Or consider installing a metal protective cover on the monitoring equipment to keep the monitoring equipment as far away as possible from the electric knife equipment.
These methods can indeed reduce the impact of electrosurgical interference on ECG equipment, but there are many inconveniences in use. For example, when using an electric knife, the ECG monitoring equipment cannot collect real-time ECG data, and it is difficult to use the offset method. Do it completely. The addition of a metal protective cover and the way to stay away from sources of interference are also subject to real-world constraints in operation.
The above is to reduce the interference of the electrosurgical device to the ECG equipment from the hardware level. It is effective but also flawed. Is it also possible to upgrade from the software level to the ECG through the upgrade of the system and algorithm? What is the protection layer of the monitoring device?
It is understood that Shenzhen Mansenberg is a technology company specializing in the field of weak signal extraction. Their chief scientist Professor Zhang Tongsheng has done in-depth research on the anti-electrosurgical equipment of ECG monitoring equipment. Professor Zhang proposed a filtering system. It can effectively filter out the electromagnetic interference of the high-frequency electric knife to the ECG monitoring equipment.
The study found that by software method, the low-frequency interference caused by the electrosurgical knife can be filtered out. After optimization by algorithm, the electrocardiogram waveform demonstration effect is good, only small vibration, the characteristic bands of the electrocardiogram can be clearly distinguished, thus minimizing the electric knife pair. The effect of heart rate measurement.
There are many methods and methods for the interference of ECG monitors against electric knives. Although they are effective, there are certain limitations in real practical applications. If you want the ECG monitor to have the ability to prevent electric knife interference, you should also pay more attention to the comprehensive use of various technical means, both hardware and software. This may be a more efficient way to eliminate the electric knife interference.
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