CN110123315B - Electroencephalogram signal detection system and device capable of resisting knife interference - Google Patents

Abstract

The invention discloses an anti-electrotome interference electroencephalogram signal detection system and device, which comprises an electrode plate for collecting electroencephalogram signals, and further comprises an electrostatic suppression module, an electromagnetic suppression filter module, a signal amplification module, a digital filter module, a cable for transmitting the electroencephalogram signals and a shielding cover for suppressing radiation electromagnetic interference generated by an electrotome, wherein the electrostatic suppression module is used for outputting the electroencephalogram signals to the signal amplification module after electrostatic release through the electromagnetic suppression filter module, the signal amplification module is used for amplifying the electroencephalogram signals after electrostatic release and then outputting the electroencephalogram signals to the digital filter module, the digital filter module is used for filtering the electroencephalogram signals after amplification and then outputting and displaying the electroencephalogram signals, the electromagnetic suppression filter module is used for suppressing conduction electromagnetic interference generated by the electrotome according to the source and the conduction path of the electrotome interference signals, the multiple inhibition barriers are arranged, so that interference generated by the electrotome is effectively inhibited, and the effectiveness and accuracy of acquiring the electroencephalogram signals are guaranteed.

Description

Electroencephalogram signal detection system and device capable of resisting knife interference

Technical Field

The invention relates to the technical field of medical instruments, in particular to an electroencephalogram signal detection system and device capable of resisting knife interference.

Background

When electroencephalogram or electrocardio signals are collected in clinic, a high-frequency electrotome is probably needed to intervene in a human body for treatment and used for cutting and blood coagulation, the equipment is high-power equipment, known commonly used high-frequency electrotome (300 KHZ-500 KHZ) and radio-frequency electrotome (900 KHZ-6 MHZ) are provided, the power is different along with different functions, the maximum power required by regulations is 350W, the signals are conducted through the body surface or internal tissues of the human body and radiated on the space, associated disturbance signals can be generated, the signals are superposed on a bioelectricity sampling electrode, sampling errors can be caused, and even the sampling amplification level of the instrument is blocked.

At present, in a human body physiological electrical signal acquisition system, such as an electrocardiogram machine and an electroencephalogram machine, after an average value of common-mode interference signals of a plurality of channels is subjected to inverse amplification, a human body is driven so as to counteract the common-mode interference signals received by the human body, and a common-mode rejection ratio of the system is improved, so that common-mode interference such as electrotome interference and the like is suppressed to a certain extent. However, the interference of the electrotome is greatly affected by whether the placement position of the physiological electric signal acquisition sensor is close to the electrotome, whether the electrotome is positioned on a reflux path between the electrotome and the reflux electrode, and whether a reflux electrode plate of the electrotome is in good contact with a human body, so that the interference of the electrotome is large to cause the saturation of a receiving circuit, even damage. The reason why the electroencephalogram signal is much weaker than the electrocardiosignal, the gain of the receiving circuit of the electroencephalogram signal is much larger than that of the receiving circuit of the electrocardiosignal, and the receiving circuit of the electroencephalogram signal is easy to saturate. When the receiving circuit is saturated, the interference of the electric knife cannot be eliminated by a method of human body driving.

Thus, the prior art has yet to be improved and enhanced.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide an electroencephalogram signal detection system and device capable of resisting electrotome interference.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an electroencephalogram signal detection system of anti-electrotome interference, includes the electrode slice that is used for gathering the electroencephalogram signal, still includes static suppression module, electromagnetic suppression filter module, signal amplification module, digital filter module and is used for transmitting the cable of electroencephalogram signal and is used for restraining the shielding cover of the radiation electromagnetic interference that the electrotome produced, static suppression module will electroencephalogram signal carries out static discharge after the electromagnetic suppression filter module exports to signal amplification module, signal amplification module carries out the amplified processing back output to digital filter module with the electroencephalogram signal after static discharge, digital filter module carries out the output display after the filtering processing with the electroencephalogram signal after the amplified processing, electromagnetic suppression filter module is used for restraining the conduction electromagnetic interference that the electrotome produced.

In the electroencephalogram signal detection system, the electromagnetic suppression filtering module comprises a first electromagnetic suppression unit, a second electromagnetic suppression unit and a filtering unit, wherein the first electromagnetic suppression unit is connected with the filtering unit and the second electromagnetic suppression unit and is used for suppressing conducted electromagnetic interference generated by an electrotome; the second electromagnetic suppression unit is connected with the filtering unit and is used for suppressing the radiation electromagnetic interference of the conducting circuit connected with the second electromagnetic suppression unit; the filtering unit is used for filtering the EEG signals released by static electricity.

In the electroencephalogram signal detection system, the static suppression module comprises a first discharge tube, a second discharge tube, a first resistor and a second resistor, one end of the first discharge tube is connected with the electromagnetic suppression filtering module and the first signal input end, and the other end of the first discharge tube is connected with one end of the second discharge tube, one end of the first resistor and one end of the second resistor; the other end of the second discharge tube is connected with a second signal input end and the electromagnetic suppression filtering module, the other end of the first resistor is connected with a first signal output end, and the other end of the second resistor is grounded.

In the electroencephalogram signal detection system, the signal amplification module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first operational amplifier and a second operational amplifier, one end of the third resistor is connected with one end of the fourth resistor through an alternating current power supply, the other end of the third resistor is connected with one end of the fifth resistor and one end of the first capacitor, and the other end of the fourth resistor is connected with one end of the second capacitor and one end of the sixth resistor; the other end of the first capacitor and one end of the second capacitor are both grounded; the other end of the fifth resistor is connected with one end of a third capacitor and one end of a seventh resistor, and the other end of the sixth resistor is connected with one end of a fourth capacitor and one end of an eighth resistor; the other end of the third capacitor and the other end of the fourth capacitor are both grounded; the other end of the seventh resistor is connected with one end of a fifth capacitor and the positive-phase input end of the first operational amplifier, and the other end of the eighth resistor is connected with one end of a sixth capacitor and the positive-phase input end of the second operational amplifier; the other end of the fifth capacitor and the other end of the sixth capacitor are both grounded; the inverting input end of the first operational amplifier is connected with one end of a ninth resistor and one end of a tenth resistor, and the inverting input end of the second operational amplifier is connected with the other end of the tenth resistor and one end of an eleventh resistor; the other end of the ninth resistor is connected with the output end of the first operational amplifier, and the other end of the eleventh resistor is connected with the output end of the second operational amplifier.

In the electroencephalogram signal detection system, the first electromagnetic suppression unit comprises an electromagnetic interference suppressor, the 1 st pin of the electromagnetic interference suppressor is connected with the filtering unit, and the 2 nd pin of the electromagnetic interference suppressor is connected with the filtering unit; the 8 th pin of the electromagnetic interference suppressor is connected with the second electromagnetic suppression unit, and the 7 th pin of the electromagnetic interference suppressor is connected with the second electromagnetic suppression unit.

In the electroencephalogram signal detection system, the second electromagnetic suppression unit comprises a first ferrite bead and a second ferrite bead, one end of the first ferrite bead is connected with the 8 th pin of the electromagnetic interference suppressor, and the other end of the first ferrite bead is connected with the filtering unit; one end of the second ferrite bead is connected with a 7 th pin of the electromagnetic interference suppressor, and the other end of the second ferrite bead is connected with the filtering unit.

In the electroencephalogram signal detection system, the filtering unit comprises a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor; one end of the twelfth resistor is connected with the static suppression module, the other end of the twelfth resistor is connected with one end of the seventh capacitor and the 1 st pin of the electromagnetic interference suppressor, and the other end of the seventh capacitor is grounded; one end of the thirteenth resistor is connected with the static suppression module, the other end of the thirteenth resistor is connected with one end of an eighth capacitor and a1 st pin of the electromagnetic interference suppressor, and the other end of the eighth capacitor is grounded; one end of the fourteenth resistor is connected with the other end of the first ferrite bead, the other end of the fourteenth resistor is connected with one end of the fifteenth resistor and one end of the ninth capacitor, and the other end of the ninth capacitor is grounded; one end of the sixteenth resistor is connected with the other end of the second ferrite bead, the other end of the sixteenth resistor is connected with one end of a tenth capacitor and one end of a seventeenth resistor, and the other end of the tenth capacitor is grounded; the other end of the fifteenth resistor is connected with one end of an eleventh capacitor and a second signal output end, and the other end of the eleventh capacitor is grounded; the other end of the seventeenth resistor is connected with one end of a twelfth capacitor and the third signal output end, and the other end of the twelfth capacitor is grounded.

In the electroencephalogram signal detection system, the cable is a shielding cable.

In the electroencephalogram signal detection system, the length of the shielding cable is less than 2.5 meters.

The electroencephalogram signal detection device capable of resisting the interference of an electrotome comprises the electroencephalogram signal detection system.

Compared with the prior art, the electroencephalogram signal detection system and device with the function of resisting the electrotome interference, provided by the invention, comprise an electrode plate for collecting electroencephalogram signals, and further comprise an electrostatic suppression module, an electromagnetic suppression filtering module, a signal amplification module, a digital filtering module, a cable for transmitting the electroencephalogram signals, and a shielding cover for suppressing the radiation electromagnetic interference generated by the electrotome, wherein the electrostatic suppression module is used for performing electrostatic release on the electroencephalogram signals, outputting the electroencephalogram signals to the signal amplification module through the electromagnetic suppression filtering module, the signal amplification module is used for performing amplification processing on the electroencephalogram signals after electrostatic release, outputting the electroencephalogram signals to the digital filtering module, the digital filtering module is used for performing filtering processing on the electroencephalogram signals after the amplification processing, outputting and displaying the electroencephalogram signals, the electromagnetic suppression filtering module is used for suppressing the conduction electromagnetic interference generated by the electrotome, and according to the source and the transmission path of the electrotome interference signals, the multiple inhibition barriers are arranged, so that interference generated by the electrotome is effectively inhibited, and the effectiveness and accuracy of acquiring the electroencephalogram signals are guaranteed.

Drawings

FIG. 1 is a block diagram of the structure of an electroencephalogram signal detection system for resisting knife-edge interference provided by the present invention;

FIG. 2 is a schematic circuit diagram of an electrostatic suppression module and an electromagnetic suppression filter module in the electroencephalogram signal detection system for resisting knife interference according to the present invention;

FIG. 3 is a schematic circuit diagram of a signal amplification module in the electroencephalogram signal detection system with resistance to electrical knife interference according to the present invention.

Detailed Description

According to the electroencephalogram signal detection system and device capable of resisting electrotome interference, multiple inhibition barriers are arranged according to the source and the conduction path of an electrotome interference signal, so that interference generated by an electrotome is effectively inhibited, and effectiveness and accuracy of acquiring the electroencephalogram signal are guaranteed.

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the electroencephalogram signal detection system for resisting knife interference provided by the present invention includes anelectrode sheet 10 for collecting electroencephalogram signals, further includes astatic suppression module 100, an electromagneticsuppression filter module 200, asignal amplification module 300, adigital filter module 400, a cable 20 for transmitting electroencephalogram signals, and ashielding cover 30 for suppressing radiation electromagnetic interference generated by an electrotome, wherein theelectrode sheet 10, the cable 20, thestatic suppression module 100, the electromagneticsuppression filter module 200, thesignal amplification module 300, and thedigital filter module 400 are sequentially connected, and theshielding cover 30 is arranged on the outer layers of the electromagneticsuppression filter module 200 and thesignal amplification module 300; the staticelectricity suppression module 100 is used for outputting the electroencephalogram signal after static electricity is released to thesignal amplification module 300 through the electromagneticsuppression filtering module 200, thesignal amplification module 300 is used for amplifying the electroencephalogram signal after static electricity is released and outputting the electroencephalogram signal to thedigital filtering module 400, thedigital filtering module 400 is used for filtering the electroencephalogram signal after the amplification and outputting the electroencephalogram signal for display, and the electromagneticsuppression filtering module 200 is used for suppressing conducted electromagnetic interference generated by an electrotome.

When the electrotome contacts the body surface of a human body, interference generated by the electrotome is transmitted to the electroencephalogram signal detection system through the body surface of the human body, signal interference exists when anelectrode plate 10 of the electroencephalogram signal detection system collects electroencephalogram signals, in order to inhibit the interference generated by the electrotome, theelectrode plate 10 transmits the collected electroencephalogram signals to theelectrostatic inhibition module 100 through a cable 20, preferably, the cable 20 is a shielding cable, the shielding cable is smaller than 2.5 meters, radiation electromagnetic interference generated by the electrotome can be inhibited through the shielding cable, and the shorter the shielding cable is, the better the inhibition effect is; then, after the static electricity discharge processing is performed on the electroencephalogram signal by the staticelectricity suppression module 100, the electroencephalogram signal is output to the electromagneticsuppression filtering module 200, the electromagneticsuppression filtering module 200 suppresses conducted electromagnetic interference generated by the electrotome, and theshielding cover 30 outside the electromagneticsuppression filtering module 200 and thesignal amplification module 300 can further suppress radiated electromagnetic interference generated by the electrotome; when the electroencephalogram signal is input into thedigital filtering module 400 again, thedigital filtering module 400 filters the electroencephalogram signal, interference generated by the electrotome can be suppressed again, and therefore multiple suppression barriers are arranged according to a source and a transmission path generated by an interference signal of the electrotome, conducted electromagnetic interference and radiated electromagnetic interference generated by the electrotome are effectively suppressed, and effectiveness and accuracy of electroencephalogram signal acquisition are guaranteed.

Further, referring to fig. 2, the electromagneticsuppression filter module 200 includes a first electromagnetic suppression unit 210, a secondelectromagnetic suppression unit 220, and afilter unit 230, wherein the first electromagnetic suppression unit 210 is connected to thefilter unit 230 and the secondelectromagnetic suppression unit 220, and is configured to suppress conducted electromagnetic interference generated by an electrotome; the secondelectromagnetic suppressing unit 220 is connected to thefiltering unit 230, and is configured to suppress electromagnetic interference radiated from the conductive circuit connected thereto; thefiltering unit 230 is configured to filter the electroencephalogram signal subjected to electrostatic discharge, and after the electroencephalogram signal subjected to electrostatic discharge passes through the first electromagnetic suppression unit 210, the secondelectromagnetic suppression unit 220 and thefiltering unit 230, the first electromagnetic suppression unit 210 can suppress conductive electromagnetic interference generated by an electrotome effectively, and the secondelectromagnetic suppression unit 220 can further suppress radiation electromagnetic interference between conductive circuits, so that the conductive electromagnetic interference generated by the electrotome is suppressed effectively, and the real effectiveness of electroencephalogram signal output is ensured.

In a specific implementation, thestatic suppression module 100 includes a first discharge tube SA1, a second discharge tube SA2, a first resistor R1 and a second resistor R2, one end of the first discharge tube SA1 is connected to the electromagneticsuppression filter module 200 and the first signal input end, and the other end of the first discharge tube SA1 is connected to one end of the second discharge tube SA2, one end of the first resistor R1 and one end of the second resistor R2; the other end of the second discharge tube SA2 is connected to the second signal input terminal and the electromagneticsuppression filter module 200, the other end of the first resistor R1 is connected to the first signal output terminal, and the other end of the second resistor R2 is grounded, where the two paths of electrostatic discharge are equivalent to the two paths of electrostatic discharge in the circuit where the first resistor R1 and the second resistor R2 exist, and electrostatic discharge can be performed according to actual needs, so as to ensure flexibility of electrostatic discharge.

Further, referring to fig. 3, thesignal amplification module 300 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first operational amplifier U1, and a second operational amplifier U2, wherein one end of the third resistor R3 is connected to one end of the fourth resistor R8269556 through an ac power supply, the other end of the third resistor R3 is connected to one end of the fifth resistor R5 and one end of the first capacitor C1, and the other end of the fourth resistor R4 is connected to one end of the second capacitor C2 and one end of the sixth resistor R6; the other end of the first capacitor C1 and one end of the second capacitor C2 are both grounded; the other end of the fifth resistor R5 is connected with one end of a third capacitor C3 and one end of a seventh resistor R7, and the other end of the sixth resistor R6 is connected with one end of a fourth capacitor C4 and one end of an eighth resistor R8; the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are both grounded; the other end of the seventh resistor R7 is connected to one end of a fifth capacitor C5 and the non-inverting input terminal of the first operational amplifier U1, and the other end of the eighth resistor R8 is connected to one end of a sixth capacitor C6 and the non-inverting input terminal of the second operational amplifier U2; the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are both grounded; the inverting input end of the first operational amplifier U1 is connected with one end of a ninth resistor R9 and one end of a tenth resistor R10, and the inverting input end of the second operational amplifier U2 is connected with the other end of the tenth resistor R10 and one end of an eleventh resistor R11; the other end of the ninth resistor R9 is connected to the output end of the first operational amplifier U1, the other end of the eleventh resistor R11 is connected to the output end of the second operational amplifier U2, and the electroencephalogram signal output by the electromagneticsuppression filtering module 200 is amplified and output by thesignal amplification module 300, so that subsequent signal display is facilitated; preferably, thesignal amplification module 300 adopts differential amplification, and can have at least 80dB rejection ratio for the common-mode signal of the radiated electromagnetic interference, thereby ensuring the accuracy and validity of the output electroencephalogram signal.

Further, with continued reference to fig. 2, the first emi suppression unit 210 includes an emi suppressor LP1, apin 1 of the emi suppressor LP1 is connected to thefiltering unit 230, and a pin 2 of the emi suppressor LP1 is connected to thefiltering unit 230; the pin 8 of the electromagnetic interference suppressor LP1 is connected to the secondelectromagnetic suppression unit 220, and the pin 7 of the electromagnetic interference suppressor LP1 is connected to the secondelectromagnetic suppression unit 220, so that the conducted electromagnetic interference generated by the electrotome is effectively suppressed by the electromagneticinterference suppressor LP 1.

Preferably, the secondelectromagnetic suppression unit 220 includes a first ferrite bead L1 and a second ferrite bead L2, one end of the first ferrite bead L1 is connected to the 8 th pin of the electromagnetic interference suppressor LP1, and the other end of the first ferrite bead L1 is connected to thefiltering unit 230; the 7 th foot of electromagnetic interference suppressor LP1 is connected to the one end of second ferrite bead L2, filteringunit 230 is connected to the other end of second ferrite bead L2, electromagnetic interference suppressor LP1 is connected with first ferrite bead L1 and second ferrite bead L2, utilizes first ferrite bead L1 and second ferrite bead L2 can effectively restrain the radiation electromagnetic interference between the conducting wire, avoids EEG signal to receive the interference in the in-process of each module transmission.

Further preferably, thefiltering unit 230 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12; one end of the twelfth resistor R12 is connected to thestatic suppression module 100, the other end of the twelfth resistor R12 is connected to one end of a seventh capacitor C7 and the 1 st pin of the electromagnetic interference suppressor LP1, and the other end of the seventh capacitor C7 is grounded; one end of the thirteenth resistor R13 is connected to theesd suppression module 100, the other end of the thirteenth resistor R13 is connected to one end of the eighth capacitor C8 and the 1 st pin of the emi suppressor LP1, and the other end of the eighth capacitor C8 is grounded; one end of the fourteenth resistor R14 is connected to the other end of the first ferrite bead L1, the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15 and one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded; one end of the sixteenth resistor R16 is connected to the other end of the second ferrite bead L2, the other end of the sixteenth resistor R16 is connected to one end of a tenth capacitor C10 and one end of a seventeenth resistor R17, and the other end of the tenth capacitor C10 is grounded; the other end of the fifteenth resistor R15 is connected with one end of an eleventh capacitor C11 and a second signal output end, and the other end of the eleventh capacitor C11 is grounded; the other end of the seventeenth resistor R17 is connected to one end of a twelfth capacitor C12 and the third signal output end, and the other end of the twelfth capacitor C12 is grounded, in this embodiment, the second signal output end is a single lead signal _ output end, and the third signal output end is a signal reference REF _ output end.

Thefiltering unit 230 can filter the electroencephalogram signal output by the staticelectricity suppression module 100 and then output the electroencephalogram signal to thesignal amplification module 300, and then the electroencephalogram signal is amplified by thesignal amplification module 300 and finally output the signal to thedigital filtering module 400 for filtering again, preferably, thedigital filtering module 400 is a digital filter, and the digital signal processing performed by the digital filter on the FPGA chip can be used for filtering, so that the interference generated by an electrotome can be further suppressed, and the accuracy and effectiveness of the electroencephalogram signal finally output for display can be ensured.

Furthermore, the electroencephalogram signal detection system further comprises a bias electrode driving circuit, the bias electrode driving circuit is used for extracting a common-mode signal in a signal input pair, the common-mode signal is amplified and then fed back to the living body, and the bias electrode driving circuit is in the prior art and is not detailed here.

Based on the above electroencephalogram signal detection system against the knife interference, the invention also correspondingly provides an electroencephalogram signal detection device against the knife interference, wherein the electroencephalogram signal detection device against the knife interference comprises the electroencephalogram signal detection system against the knife interference.

In summary, the electroencephalogram signal detection system and device with the function of resisting the electrical knife interference provided by the invention comprise an electrode slice for collecting electroencephalogram signals, and further comprise an electrostatic suppression module, an electromagnetic suppression filter module, a signal amplification module, a digital filter module, a cable for transmitting the electroencephalogram signals, and a shielding cover for suppressing the radiation electromagnetic interference generated by an electrical knife, wherein the electrostatic suppression module is used for performing electrostatic discharge on the electroencephalogram signals, outputting the electroencephalogram signals to the signal amplification module through the electromagnetic suppression filter module, the signal amplification module is used for performing amplification processing on the electroencephalogram signals after electrostatic discharge, outputting the electroencephalogram signals to the digital filter module, the digital filter module is used for performing filter processing on the electroencephalogram signals after amplification processing, outputting and displaying the electroencephalogram signals, the electromagnetic suppression filter module is used for suppressing the conduction electromagnetic interference generated by the electrical knife according to the source and the conduction path of the electrical knife interference signals, the multiple inhibition barriers are arranged, so that interference generated by the electrotome is effectively inhibited, and the effectiveness and accuracy of acquiring the electroencephalogram signals are guaranteed.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (9)

1. An electroencephalogram signal detection system resisting knife interference comprises an electrode plate for collecting electroencephalogram signals, and is characterized by further comprising an electrostatic suppression module, an electromagnetic suppression filtering module, a signal amplification module, a digital filtering module, a cable for transmitting the electroencephalogram signals and a shielding cover for suppressing radiation electromagnetic interference generated by a knife, wherein the electrostatic suppression module is used for outputting the electroencephalogram signals to the signal amplification module through the electromagnetic suppression filtering module after electrostatic release, the signal amplification module is used for amplifying the electroencephalogram signals after electrostatic release and outputting the signals to the digital filtering module, the digital filtering module is used for filtering the electroencephalogram signals after amplification and outputting the signals for display, and the electromagnetic suppression filtering module is used for suppressing conduction electromagnetic interference generated by the knife; the signal amplification module comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first operational amplifier and a second operational amplifier, wherein one end of the third resistor is connected with one end of the fourth resistor through an alternating current power supply, the other end of the third resistor is connected with one end of the fifth resistor and one end of the first capacitor, and the other end of the fourth resistor is connected with one end of the second capacitor and one end of the sixth resistor; the other end of the first capacitor and one end of the second capacitor are both grounded; the other end of the fifth resistor is connected with one end of a third capacitor and one end of a seventh resistor, and the other end of the sixth resistor is connected with one end of a fourth capacitor and one end of an eighth resistor; the other end of the third capacitor and the other end of the fourth capacitor are both grounded; the other end of the seventh resistor is connected with one end of a fifth capacitor and the positive-phase input end of the first operational amplifier, and the other end of the eighth resistor is connected with one end of a sixth capacitor and the positive-phase input end of the second operational amplifier; the other end of the fifth capacitor and the other end of the sixth capacitor are both grounded; the inverting input end of the first operational amplifier is connected with one end of a ninth resistor and one end of a tenth resistor, and the inverting input end of the second operational amplifier is connected with the other end of the tenth resistor and one end of an eleventh resistor; the other end of the ninth resistor is connected with the output end of the first operational amplifier, and the other end of the eleventh resistor is connected with the output end of the second operational amplifier.

2. The electroencephalogram signal detection system for resisting electrotome interference according to claim 1, wherein the electromagnetic suppression filtering module comprises a first electromagnetic suppression unit, a second electromagnetic suppression unit and a filtering unit, and the first electromagnetic suppression unit is connected with the filtering unit and the second electromagnetic suppression unit and is used for suppressing conducted electromagnetic interference generated by an electrotome; the second electromagnetic suppression unit is connected with the filtering unit and is used for suppressing the radiation electromagnetic interference of the conducting circuit connected with the second electromagnetic suppression unit; the filtering unit is used for filtering the EEG signals released by static electricity.

3. The system for detecting electroencephalogram signals resisting knife interference according to claim 1, wherein the static suppression module comprises a first discharge tube, a second discharge tube, a first resistor and a second resistor, one end of the first discharge tube is connected with the electromagnetic suppression filtering module and the first signal input end, and the other end of the first discharge tube is connected with one end of the second discharge tube, one end of the first resistor and one end of the second resistor; the other end of the second discharge tube is connected with a second signal input end and the electromagnetic suppression filtering module, the other end of the first resistor is connected with a first signal output end, and the other end of the second resistor is grounded.

4. The system for detecting electroencephalogram signals resisting knife interference according to claim 2, wherein the first electromagnetic suppression unit comprises an electromagnetic interference suppressor, the 1 st pin of the electromagnetic interference suppressor is connected with the filtering unit, and the 2 nd pin of the electromagnetic interference suppressor is connected with the filtering unit; the 8 th pin of the electromagnetic interference suppressor is connected with the second electromagnetic suppression unit, and the 7 th pin of the electromagnetic interference suppressor is connected with the second electromagnetic suppression unit.

5. The system for detecting electroencephalogram signals resisting knife-edge interference according to claim 4, wherein the second electromagnetic suppression unit comprises a first ferrite bead and a second ferrite bead, one end of the first ferrite bead is connected with the 8 th pin of the electromagnetic interference suppressor, and the other end of the first ferrite bead is connected with the filtering unit; one end of the second ferrite bead is connected with a 7 th pin of the electromagnetic interference suppressor, and the other end of the second ferrite bead is connected with the filtering unit.

6. The system for detecting electroencephalogram signals resisting knife-edge interference according to claim 5, wherein the filtering unit comprises a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor; one end of the twelfth resistor is connected with the static suppression module, the other end of the twelfth resistor is connected with one end of the seventh capacitor and the 1 st pin of the electromagnetic interference suppressor, and the other end of the seventh capacitor is grounded; one end of the thirteenth resistor is connected with the static suppression module, the other end of the thirteenth resistor is connected with one end of an eighth capacitor and a1 st pin of the electromagnetic interference suppressor, and the other end of the eighth capacitor is grounded; one end of the fourteenth resistor is connected with the other end of the first ferrite bead, the other end of the fourteenth resistor is connected with one end of the fifteenth resistor and one end of the ninth capacitor, and the other end of the ninth capacitor is grounded; one end of the sixteenth resistor is connected with the other end of the second ferrite bead, the other end of the sixteenth resistor is connected with one end of a tenth capacitor and one end of a seventeenth resistor, and the other end of the tenth capacitor is grounded; the other end of the fifteenth resistor is connected with one end of an eleventh capacitor and a second signal output end, and the other end of the eleventh capacitor is grounded; the other end of the seventeenth resistor is connected with one end of a twelfth capacitor and the third signal output end, and the other end of the twelfth capacitor is grounded.

7. The system for detecting brain electrical signals resistant to electrical knife interference of claim 1, wherein said cable is a shielded cable.

8. The system for detecting brain electrical signals resistant to electrical knife interference of claim 7, wherein said shielded cable is less than 2.5 meters in length.

9. An electroencephalogram signal detection device against knife interference, characterized in that the electroencephalogram signal detection device comprises the electroencephalogram signal detection system against knife interference according to any one of claims 1 to 8.

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