A control method and system for a high-frequency electrotome with the function of surgical smoke purification

Abstract

The present invention relates to a high-frequency electric knife control method and system with a surgical smoke purification function, comprising a control module and a power supply system, a smoke purification device and a high-frequency electric knife device electrically connected to the control module respectively, the power supply system being used to independently power each module; the high-frequency electric knife device being used to realize the integration and switching of single and bipolar modes; the smoke purification device being used to control the start and stop speed of a fan according to different working modes to control the suction force of the purified smoke and synchronize the working state of the high-frequency electric knife; the control module being used to control the start and stop of the high-frequency electric knife and the smoke purification function, calculate the load resistance value according to the obtained voltage signal and current signal, adjust the target control power under different working modes according to the change of the load resistance value and based on a preset control algorithm, synchronize the high-frequency electric knife and the smoke purification function, purify the smoke generated during the use of the high-frequency electric knife, and achieve protection for medical staff and patients.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a high-frequency electric knife control method and system with a surgical smoke purification function. Background Art

[0002] The high-frequency electrosurgical control system heats the operated tissue through the high-frequency current generated by the surgical electrodes, thereby separating and coagulating the operated tissue, thereby achieving the effects of cutting and coagulation.

[0003] General high-frequency electrosurgical control systems do not have smoke purification devices. When using a high-frequency electrosurgical control system for surgery, the cells of the operated tissue (including viruses) will be vaporized to produce surgical smoke. Surgical smoke will not only obstruct the surgeon's vision, but also contain harmful chemical components, biological particles, active cell substances or viruses, inactive particles, carbonized tissue and bacteria. Inhalation of surgical smoke will cause great harm to the health of medical staff, thereby reducing the overall practicality of the high-frequency electrosurgical control system.

[0004] Currently, when using a high-frequency electrosurgical unit control system for surgery, a smoke purification device must be configured to complete the smoke purification operation. This will occupy the surgical operating space. Equipment from different manufacturers does not work well together and cannot be operated synchronously with the electrosurgical unit. A separate foot switch must be controlled, which is inconvenient to use and will increase the hospital's equipment usage costs. Summary of the Invention

[0005] The present invention provides a control method and system for a high-frequency electrosurgical unit with surgical smoke purification. This system synchronizes the high-frequency electrosurgical unit with the smoke purification function, purifies smoke generated during operation, calculates the load resistance based on acquired voltage and current signals, determines whether the device is abnormal based on changes in the load resistance, and adjusts the target control power in different operating modes based on a preset control algorithm. This prevents surgical accidents such as burns caused by unstable electrosurgical output due to changes in resistance and impedance.

[0006] On one hand, the present invention provides a high-frequency electrosurgical unit control system with a surgical smoke purification function, comprising a control module and a power supply system, a smoke purification device, and a high-frequency electrosurgical unit electrically connected to the control module.

[0007] The power supply system includes a filter and multiple power supply modules. After AC input and filtering by the filter, it is divided into multiple power supply modules adapted to the high-frequency electrosurgical device and the smoke purification device, and is used to independently power the control module, the smoke purification device and the power modules in different modes;

[0008] The high-frequency electrosurgical device includes a DC step-down module, a high-frequency inverter module, a single-pole and double-pole switching circuit, and a plurality of electrodes. The DC step-down module and the high-frequency inverter module are electrically connected in sequence to control the target power supply and AC-DC conversion. At the same time, the high-frequency inverter module is controlled by a high-frequency drive module connected to the control module. The high-frequency inverter module and the single-pole and double-pole switching circuit are connected to different output electrodes to achieve integration and switching of single-pole and double-pole modes.

[0009] The smoke purification device includes a fan control module and a fan electrically connected in sequence, which is used to control the fan start and stop speed according to different working modes to control the suction force of the purified smoke, thereby synchronizing the working state of the high-frequency electric knife control system to realize the linkage mode;

[0010] The control module includes a high-frequency current and voltage acquisition module and a high-frequency signal processing module, which respectively obtain current and voltage signals from the bipolar output electrode end, the unipolar output electrode end and the neutral electrode end and input them into the high-frequency current and voltage acquisition module, and then pass through the high-frequency signal processing module to the control module, and is used to control the start and stop of the high-frequency electric knife and smoke purification functions, calculate the load resistance value based on the obtained voltage signal and current signal, judge whether the equipment status is abnormal based on the change of the load resistance value, and adjust the target control power in different working modes based on the preset control algorithm.

[0011] Preferably, the smoke purification device further includes a smoking assembly integrated on a circuit board, the smoking assembly including a sterile suction tip, an external detachable filter, a first built-in filter, a second built-in filter and a plurality of connecting pipes, one end of the sterile suction tip is close to the end of the high-frequency electric knife head to absorb smoke released during surgery, the other end of the sterile suction tip is connected to one end of the external detachable filter via a first connecting pipe, the other end of the external detachable filter is connected to one end of the first built-in filter via a second connecting pipe, the other end of the first built-in filter is connected to one end of a brushless motor via a third connecting pipe, the other end of the brushless motor is connected to one end of the second built-in filter via a fourth connecting pipe, after the absorbed surgical smoke is filtered through multiple stages, the other end of the second built-in filter discharges the filtered gas through a fifth connecting pipe channel;

[0012] In operation, the brushless fan rotates to generate negative pressure, which draws smoke generated during surgery into the filter through the pipeline channel. After multi-stage filtration by multiple filters, harmless gas is discharged. After the brushless fan starts working, the speed of the brushless fan is automatically or manually adjusted according to the different working modes, so as to achieve smoking while avoiding severe heating of the brushless fan.

[0013] In linkage mode, the device status of the high-frequency electric knife device is monitored to determine the device working status and mode, the start and stop of the high-frequency electric knife and the smoke purification function are synchronized, the speed of the built-in brushless fan is automatically adjusted to adjust the suction force according to different application scenarios, and the speed is dynamically adjusted by monitoring the smoke concentration based on the smoke particle sensor module configured at the transition part inside and outside the connecting pipe to ensure the smoking efficiency of the smoke purification device in a low-noise environment.

[0014] Preferably, the high-frequency electrosurgical device further comprises a neutral electrode detection circuit connected to the control module, and a detection method of the neutral electrode detection circuit comprises:

[0015] Define the first voltage threshold V1, the second voltage threshold V2 and the third voltage threshold V3 under different voltage acquisition scenarios,

[0016] When the current voltage amplitude V read by the control module is greater than the first voltage threshold V1 and the current voltage amplitude is less than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is within the preset impedance threshold range, and the neutral electrode is in a normal contact state, and the contact impedance value is displayed;

[0017] When the current voltage amplitude V read by the control module is greater than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, and the neutral electrode is in an abnormal contact state. An abnormality reminder is issued, indicating that the neutral electrode contact impedance is too large, and power output is prohibited until the neutral electrode is in a normal state.

[0018] When the current voltage amplitude read by the control module is the same as the third voltage threshold V3, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, indicating that the neutral electrode is disconnected. A neutral electrode disconnection prompt is issued, and power output is prohibited until the neutral electrode is connected and is in a normal state.

[0019] Among them, the first voltage threshold V1 is the voltage value collected when the neutral electrode is in full contact with the measured body, the second voltage threshold V2 is the voltage value collected when the neutral electrode is in abnormal contact with the measured body, and the third voltage threshold V3 is the voltage value collected when the neutral electrode is not connected to the measured body, and the voltage value size relationship is: V1 <V2<V3。

[0020] Preferably, before calculating the load resistance value according to the acquired voltage signal and current signal, the method includes:

[0021] Dividing the voltage signal or the current signal according to a preset power level to obtain a first power segment and a second power segment, and acquiring first sampled data and second sampled data according to the first power segment and the second power segment respectively;

[0022] Filter the first sampling data based on a sliding average filtering algorithm, set a filtering window, extract the maximum sampling value advmax and the minimum sampling value advmin and filter them, average the filtered first sampling data within the filtering window, and calculate the filtered first sampling result adv of the current sample point = (sum(adv[0]~adv[n-1])-(advmax+advmin)) / (n-2);

[0023] Shifting the first sample data in the filtering window to the next target position, and repeating the above filtering operation until all sample points are filtered;

[0024] Perform secondary filtering on the second sampling data based on a low-pass filtering algorithm, and calculate the filtered second sampling result adv=a*cur_adv+(1-a)last_adv;

[0025] Among them, the filtering window includes sampling values adv[0], adv[1].. adv[n-1] of a preset number of bits, n is the number of sampling times, cur_adv is the current actual sampling value, last_adv is the last filtering sampling result, a is the filtering coefficient set according to the frequency to be filtered out, and the first sampling data and the second sampling data are both voltage and current data.

[0026] Preferably, the steps of calculating the load resistance value based on the acquired voltage signal and current signal, determining whether the device state is abnormal based on a change in the load resistance value, and adjusting the final output power under different working modes based on a preset control algorithm include:

[0027] When the external measured human body impedance changes, the voltage HV and the current HI of the high-frequency electrosurgical device are obtained, and the current actual power is output based on the sine wave.

[0028] Compare the currently calculated power with the set power threshold, and calculate the k-th and k-1-th power error results;

[0029] The driving change value △duty = kp* err(k)- err(k-1)+kd(err(k)-err(k-1)) is calculated based on the kth and k-1th power error results.

[0030] When the power error value is greater than 0, the currently calculated power is less than the set power threshold, and the output target drive value is increased to achieve the target control power;

[0031] When the power error value is less than 0, and the currently calculated power is greater than the set power threshold, the output target drive value is reduced to achieve the target control power;

[0032] The target driving value duty(k)=duty(k-1)+Δduty, the power error value err(k)=Pset(k)-P(k), kp is the error proportional coefficient, and kd is the differential coefficient.

[0033] Preferably, the high-frequency electrosurgical device further includes a first transformer, a first resonant circuit, a second transformer and a second resonant circuit.

[0034] The branch of the monopolar-bipolar switching circuit is connected to the bipolar output electrode together with the first transformer and the first resonant circuit, and is used to perform electrocuting and electrocoagulation operations by flowing a high-frequency and high-voltage current between the two poles of a bipolar instrument to achieve a bipolar mode;

[0035] The other branch of the monopolar and bipolar switching circuit is connected to the monopolar output electrode together with the second transformer and one end of the second resonant circuit. The other end of the second resonant circuit is connected to the input end of the neutral electrode to form a loop. The output end of the neutral electrode is connected to the neutral electrode detection circuit and fed back to the control module. The output end of the monopolar output electrode is connected to the handle detection circuit and fed back to the control module, which is used to detect circuit abnormalities in the monopolar mode and use the heat energy and discharge released by the high-frequency current to cut and stop bleeding on the tissue to achieve the monopolar mode.

[0036] The present invention also provides a control method for a high-frequency electrosurgical unit control system with a surgical smoke purification function, which is used to control the high-frequency electrosurgical unit control system with a surgical smoke purification function as described in an embodiment of the present invention;

[0037] The control method includes:

[0038] When the linkage mode is started, the device status of the high-frequency electrosurgical device is monitored to determine the device working status and mode, and the smoke purification device and the high-frequency electrosurgical device are automatically started and stopped;

[0039] When the high-frequency electrosurgical unit is activated, the load resistance is calculated based on the acquired voltage and current signals. The load resistance change determines whether the device is abnormal. The target control power in different operating modes is adjusted based on the preset control algorithm to control the functional output of the high-frequency electrosurgical unit.

[0040] When the smoke purification mode is started, the speed of the built-in brushless fan is automatically adjusted to adjust the suction force according to different application scenarios. The smoke concentration is monitored and the speed is dynamically adjusted according to the smoke particle sensor module configured in the transition part inside and outside the connecting pipe to ensure the smoking efficiency of the smoke purification device in a low-noise environment.

[0041] Preferably, judging whether the device state is abnormal according to the change in load resistance includes:

[0042] Define the first voltage threshold V1, the second voltage threshold V2 and the third voltage threshold V3 under different voltage acquisition scenarios,

[0043] When the current voltage amplitude V read by the control module is greater than the first voltage threshold V1 and the current voltage amplitude is less than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is within the preset impedance threshold range, and the neutral electrode is in a normal contact state, and the contact impedance value is displayed;

[0044] When the current voltage amplitude V read by the control module is greater than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, and the neutral electrode is in an abnormal contact state. An abnormality reminder is issued, indicating that the neutral electrode contact impedance is too large, and power output is prohibited until the neutral electrode is in a normal state.

[0045] When the current voltage amplitude read by the control module is the same as the third voltage threshold V3, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, indicating that the neutral electrode is disconnected. A neutral electrode disconnection prompt is issued, and power output is prohibited until the neutral electrode is connected and is in a normal state.

[0046] Among them, the first voltage threshold V1 is the voltage value collected when the neutral electrode is in full contact with the measured body, the second voltage threshold V2 is the voltage value collected when the neutral electrode is in abnormal contact with the measured body, and the third voltage threshold V3 is the voltage value collected when the neutral electrode is not connected to the measured body, and the voltage value size relationship is: V1 <V2<V3。

[0047] The present invention also provides a high-frequency electric knife, comprising the high-frequency electric knife control system with surgical smoke purification function as described in the embodiment of the present invention.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The present invention discloses a high-frequency electric knife control system with a surgical smoke purification function, integrates a smoke purification device into the high-frequency electric knife device, triggers a linkage mode, monitors the device status of the high-frequency electric knife device to determine the device working status and mode, synchronizes the start and stop of the high-frequency electric knife and the smoke purification function, automatically adjusts the rotation speed of the built-in brushless fan to adjust the suction force according to different application scenarios, and dynamically adjusts the rotation speed by monitoring the smoke concentration based on the smoke particle sensor module configured at the inner and outer transition parts of the connecting pipe to ensure the smoking efficiency of the smoke purification device in a low-noise environment; calculates the load resistance value based on the obtained voltage signal and current signal, determines whether the device status is abnormal based on the change of the load resistance value, and adjusts the target control power under different working modes based on the preset control algorithm to avoid surgical accidents such as burns caused by the unstable output of the electric knife when the resistance impedance changes.

[0050] The smoke purification device used in the present invention filters surgical smoke through multi-stage ULPA sensors, isolates the diffusion of surgical smoke from the source, and protects the health of medical staff. The control board of the smoke purification device is combined with the high-frequency electric knife mainboard to realize digital intelligent control, synchronize the start and stop of the high-frequency electric knife and smoke purification functions, and automatically adjust the speed of the built-in fan to adjust the suction force according to different application scenarios, thereby ensuring the efficiency of smoke purification, facilitating surgical operations, reducing the space occupied by the equipment, and effectively reducing the equipment usage cost of the hospital; the filter element life detection module predicts the remaining usage time and issues a replacement reminder.

[0051] The high-frequency electric knife of the present invention is equipped with a 4MHz unipolar working mode and a 1.7MHz bipolar working mode, which are switched through a unipolar and bipolar selection circuit. The power output mode and size are first selected on the screen. When the single-chip microcomputer detects that the unipolar mode of the foot pedal is stepped on or the button on the unipolar handle is pressed, the single-chip microcomputer controls the unipolar relay to be energized and output energy with a frequency of 4MHz. When the single-chip microcomputer detects that the bipolar pedal of the foot pedal is stepped on, it controls the bipolar relay to be energized and output energy with a frequency of 1.7MHz.

[0052] In the present invention, when the impedance at both ends of the neutral electrode changes, the voltage at the input end of the impedance measurement circuit will change. This voltage is transmitted to the rectifier circuit through the transformer to obtain a DC voltage. The DC voltage is sent to the single-chip microcomputer for reading and judgment. When the impedance at both ends of the neutral electrode reaches Rmax, the voltage drops to Vmin, and the single-chip microcomputer issues a prompt that the neutral electrode impedance is too high. When the neutral electrode impedance is within the allowable range, the single-chip microcomputer displays the neutral electrode impedance on the screen to prompt the operator.

[0053] The present invention collects the high-frequency voltage and current output by the electrode through a voltage collection transformer and a current collection mutual inductor. The signal processing module rectifies the collected signal through a Schottky diode to obtain a DC voltage. This DC voltage is sent to the single-chip AD for reading and calculation after voltage division, and the load impedance size and real-time power can be obtained. When the load resistance changes, the single-chip microcomputer can automatically adjust the output power size according to the resistance value to stabilize the output.

[0054] The present invention inserts a power filter into an AC input power line, and at the output end of the filter, the power line is wound around a high-frequency magnetic ring for several turns and fixed with a tie, so as to filter the high-frequency interference generated by the high-frequency electric knife and suppress the interference conducted to other equipment through the power line. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a structural diagram of a high-frequency electrosurgical unit control system with a surgical smoke purification function according to the first embodiment of the present invention;

[0056] Figure 2a-2bThis is a specific example diagram of a high-frequency signal processing module in a complete device according to the first embodiment of the present invention;

[0057] Figure 3 Schematic diagram of the overall sampling algorithm flow in embodiment 1 of the present invention;

[0058] Figure 4 This is an example diagram of the power adjustment control process in the first embodiment of the present invention;

[0059] Figure 5 This is a structural diagram illustrating a smoking assembly in the first embodiment of the present invention;

[0060] Figure 6 This is an example diagram of the structure of the filter and the high-frequency magnetic ring in the first embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The term "including" and its variations used in this article represent open inclusion, that is, "including but not limited to."

[0062] General high-frequency electrosurgeries do not have smoke purification devices, which causes these fumes to endanger the health of medical staff, thereby reducing the overall practicality of high-frequency electrosurgeries. Most high-frequency surgical equipment on the market does not have smoke purification devices. When using an electrosurgery, doctors need to equip themselves with a smoke extraction device, which takes up surgical space and increases the cost of using high-frequency electrosurgeries. Integrating a smoke purification device into a high-frequency electrosurgery can effectively reduce the cost of using the equipment. The electrosurgeries and smoke purification devices of different manufacturers are not highly compatible, and digital control cannot be fully achieved. Doctors need to control the smoke purification device while controlling the electrosurgery, which increases the complexity of the surgical operation. Integrating the smoke purification device with the electrosurgery can achieve digital control. The smoke purification device synchronizes with the electrosurgery operation, and suction adjustment can be performed on the electrosurgery.

[0063] In order to solve the above technical problems, the present invention discloses a high-frequency electrosurgical control system with a surgical smoke purification function, such as Figure 1 As shown, the control system includes a control module and a power supply system, a smoke purification device and a high-frequency electric knife device electrically connected to the control module.

[0064] The power supply system includes a filter and multiple power supply modules, which are divided into multiple power supply modules compatible with the high-frequency electric knife device and the smoke purification device after AC input and filtering by the filter, namely, a power module power supply, a control module power supply and a fan power supply, which are used to independently power the control module, the smoke purification device and the power modules in different modes; the high-frequency electric knife device includes a DC step-down module, a high-frequency inverter module, a single-pole and bipolar switching circuit and multiple electrodes, the power module power supply, the DC step-down module and the high-frequency inverter module are electrically connected in sequence to control the target power supply and AC-DC conversion, and the high-frequency inverter module is controlled by a high-frequency drive module connected to the control module, and the high-frequency inverter module and the single-pole and bipolar switching circuit are connected to different output electrodes to achieve Integration and switching of single and bipolar modes; the smoke purification device includes a fan power supply, a fan control module and a fan electrically connected in sequence, which are used to control the fan start and stop speed according to different working modes to control the suction force of the purified smoke, thereby synchronizing the working state of the high-frequency electric knife control system to realize the linkage mode; the control module includes a high-frequency current, voltage acquisition module and a high-frequency signal processing module, which respectively obtain current and voltage signals from the bipolar output electrode end, the unipolar output electrode end and the neutral electrode end and input them into the high-frequency current and voltage acquisition module, and pass through the high-frequency signal processing module to the control module, which is used to control the start and stop of the high-frequency electric knife and smoke purification functions, calculate the load resistance according to the obtained voltage signal and current signal, and adjust the target control power under different working modes according to the change of the load resistance and based on the preset control algorithm.

[0065] Among them, the power supply system adopted in the embodiment of the present invention: the network power input passes through the power filter CW2E-10A-T and common-mode inductor for EMI filtering to reduce the common-mode and differential-mode interference generated by the electric knife, and then passes through three AC / DC power supplies to separate 48V, 36V, and 24V DC power supplies. That is, the power supply module includes a power module power supply, a control module power supply, and a fan power supply. Among them, 48V and 36V are combined in series to form 84V to power the power module, and 36V is converted to 15V, 12V, and 5V through the DCDC step-down chip to power the control module, and 24V to power the fan. Each group of power supplies passes through a double π-type filtering circuit composed of two common-mode inductors and capacitors before output, further improving the system's anti-interference capability. DC step-down module: The 84V power module serves as the input power source for the DC step-down module. Two parallel MOSFET synchronous step-down circuits output the voltage for the high-frequency inverter module. The output voltage is adjusted by varying the duty cycle of the MOSFET drive waveform. The two step-down circuits are connected in parallel and staggered, which increases the output current capability of the step-down circuit and reduces MOSFET heat generation. High-frequency driver module: The control module's CPLD provides two complementary 4MHz or 1.7MHz square wave signals. These signals are enhanced through inverters and logic gates to deliver them to the driver chip. The high-side transistor is driven by an isolated power supply. The 15V isolated power supply is supplied to the driver chip via a dual-π filter consisting of two common-mode inductors and capacitors, and a multi-stage capacitor filter circuit. The negative terminal of the isolated power supply is connected to the S-pole of the MOSFET, the driver chip, the digital isolation chip, and the GND of the LDO. This ensures that the VGS voltage of the high-side transistor is equal to the voltage of the isolated power supply. When the high-side transistor is turned off, the S-pole voltage is 0V, ensuring saturation conduction and shutdown of the high-side transistor. The drive signal of the high-side transistor is isolated by the digital isolation chip. The isolation chip is powered by a 15V to 5V LDO and then transmitted to the driver chip. The square wave signal output by the driver chip is transmitted to the G pole of the upper tube after passing through the resistor and the magnetic bead. The lower tube is directly driven by the driver chip. The driver chip is powered by a 15V power supply. The GND of the driver chip and the S pole of the lower tube are grounded. The drive signal is transmitted to the driver chip after being pulled up by 5V. Finally, the square wave signal output by the driver chip is transmitted to the G pole of the lower tube after passing through the resistor and the magnetic bead to turn on the lower tube. The resistor and the magnetic bead between the G pole of the MOS tube and the output of the driver chip can effectively weaken the ringing of the drive signal and reduce the EMI interference caused by the rapid turn-on of the MOS.High-frequency inverter module: The step-down circuit powers the high-frequency inverter module. Two MOSs and multiple sets of voltage-dividing capacitors and resistors connected in series and parallel, and the primary of the transformer (equivalent to an inductor) form a half-bridge inverter topology. A low-voltage, high-current AC signal is output at the primary of the transformer, which is amplified at the secondary of the transformer to output a high-voltage, low-current AC signal. A 100pF capacitor is connected in parallel to the DS poles of the two MOS tubes to ensure the switching of the MOS tube and further reduce the EMI interference caused by the rapid conduction of the MOS. The voltage-dividing capacitor is two 22uF ceramic capacitors in series, one end of which is connected to the output of the step-down circuit and the other end is grounded. Then ten groups of voltage-dividing capacitors are connected in parallel. The voltage-dividing resistor is two 470kΩ resistors connected in series and then in parallel with the voltage-dividing capacitor. The series points of all capacitors and resistors are connected together and then connected to one end of the primary of the transformer. The other end of the primary of the transformer is connected to the S pole of the upper tube. The single-pole and bipolar switching circuit uses two double-pole, double-throw (DPDT) relays to perform single-pole and bipolar switching. One relay switch is connected to the S-pole of the upper diode and one end of the transformer's primary, while the other is connected to the center of a series capacitor and the other end of the transformer's primary. The relays are powered by a 12V power supply, and a control module outputs a switching signal. An LED and a current-limiting resistor are connected between the control signal and the 12V voltage to indicate the relay's switching signal. The control module consists of a single-chip microcontroller (MCU) and two CPLDs. The MCU controls one CPLD to output a drive signal for a step-down circuit with varying duty cycles. Upon detecting a load change, the MCU adjusts the duty cycle and the output voltage of the step-down circuit, thereby achieving power regulation and stabilization. The other CPLD, under the control of the MCU, outputs a 4M or 1.7M drive signal. The modulation time of the output signal can be varied in different modes to modulate the final high-frequency power, making it suitable for different surgical scenarios, such as pure incision, mixed incision, and coagulation. The control module is also connected to a display module. The fan control module adopts the sensor / Hall brushless motor control mode. The fan speed is adjusted by the square wave signal with different duty cycles output by the single-chip microcomputer of the control module. The control board can also detect the fan speed to complete closed-loop control. When the single-chip microcomputer detects the surgical electrode start signal, such as the foot is stepped on or the handle button is pressed, the fan is controlled to start and the surgical smoke is purified. The suction force of the fan can be set through the display module.

[0066] Specifically, the high-frequency electric knife device used in the embodiment of the present invention also includes a first transformer, a first resonant circuit, a second transformer and a second resonant circuit. One branch of the single-bipolar switching circuit is connected to the bipolar output electrode with the first transformer and the first resonant circuit, and is used to perform electric cutting and electric coagulation operations by flowing high-frequency high-voltage current between the two poles of the bipolar instrument to achieve a bipolar mode; another branch of the single-bipolar switching circuit is connected to the monopolar output electrode with one end of the second transformer and the second resonant circuit, and the other end of the second resonant circuit is connected to the input end of the neutral electrode to form a loop, the output end of the neutral electrode is connected to the neutral electrode detection circuit and fed back to the control module, and the output end of the monopolar output electrode is connected to the handle detection circuit and fed back to the control module, and is used to detect circuit abnormalities in the monopolar mode and use the heat energy and discharge released by the high-frequency current to cut and stop bleeding of the tissue to achieve the monopolar mode. This high-frequency electrosurgical unit is configured with a 4MHz unipolar operating mode and a 1.7MHz bipolar operating mode, switched between via a unipolar and bipolar selection circuit. The power output mode and level are selected on the screen. When the microcontroller detects the unipolar foot pedal being pressed or a button on the unipolar handle being pressed, it controls the unipolar relay to energize, outputting energy at a frequency of 4MHz. When the microcontroller detects the bipolar foot pedal being pressed, it controls the bipolar relay to energize, outputting energy at a frequency of 1.7MHz. Both the first and second resonant circuits are composed of L, C, and R. The secondary of the transformer is connected to the common-mode inductor L, and a mica capacitor and metal film are connected to the output of L to form a resonant frequency selection circuit.

[0067] This device receives AC input, passes through a filter, and is then divided into three modules: a power module, a control module, and a fan power supply. The power module controls a DC step-down module, which is connected to a high-frequency inverter module. The control module controls the power supply, which in turn controls a high-frequency driver module, which in turn controls a high-frequency inverter module. The high-frequency inverter module, in conjunction with a single- and bipolar switching circuit, enables switching between single and bipolar circuits. One circuit connects to a transformer and a resonant circuit for bipolar output, while the other connects to a transformer and a resonant circuit for unipolar output. The high-frequency current and voltage acquisition module collects and processes voltage and current in real time and feeds this information back to the main control module, delivering stable output power. A neutral electrode is connected to the transformer and resonant circuit, and the neutral electrode detection circuit feeds back to the control module. The unipolar output electrode is also connected to a handle detection circuit, which provides a signal to the control module. A pedal sends feedback to the control module via a pedal detection circuit, which in turn feeds information to a display, which is connected to a speaker. The fan power supply controls the fan control module, which controls the fan control module via a digital interface.

[0068] See also Figure 2a-2bAs shown, the high-frequency signal processing module includes: a voltage acquisition transformer and a current acquisition transformer. The high-frequency voltage and current output by the electrode are collected through the voltage acquisition transformer and the current acquisition transformer. The signal processing module rectifies the collected signal through a Schottky diode to obtain a DC voltage. This DC voltage is sent to the microcontroller AD for reading and calculation after voltage division, and the load impedance and real-time power can be obtained. When the load resistance changes, the microcontroller can automatically adjust the output power according to the resistance value to stabilize the output. The voltage acquisition transformer includes a bipolar connector CT3, a first capacitor C37, a voltage acquisition transformer T1, a current limiting resistor R23, a first Schottky diode D18, a second Schottky diode D19, C86, etc. One end of the bipolar connector and one end of the first capacitor are connected to the fourth port of the voltage acquisition transformer, the other end of the first capacitor is connected to the output end BIPO_OUT1 of the first resonant circuit, the ninth port of the voltage acquisition transformer is connected to one end of the current limiting resistor, the fifth port of the voltage acquisition transformer and the other end of the current limiting resistor are connected to the output port HF_VO_SIGNAL1 of the AC voltage, and the first resonant circuit steps down the 1.7MHz high-voltage sine wave from the secondary Output, the stepped-down sinusoidal signal is sent to the first Schottky diode D18, the second Schottky diode D19 and the second capacitor C86 connected in series for half-wave rectification to obtain a primary DC voltage, which is processed by the voltage divider network composed of R37, R39, and R40 to obtain a bipolar voltage signal and sent to the AD port of the microcontroller for reading. The output end BIPO_OUT2 of the second resonant circuit and the current acquisition transformer composed of T2, T3, and T5 output a voltage signal at the secondary of the transformer. R31 is a current limiting resistor, and the sinusoidal signal is sent to D21, D22, and C87 for half-wave rectification to obtain a DC voltage. The DC voltage is processed by the voltage divider network composed of R41 and R42 to obtain a bipolar current signal and sent to the AD port of the microcontroller for reading.

[0069] One end of the 4MHz unipolar output terminal CT4 is connected to one end of the voltage acquisition transformer T9 through C77, and the neutral electrode terminal CT5 is connected to the other end of the transformer through C78 and C81. T9 steps down the 4MHz high-voltage sine wave and outputs it from the secondary. R33 is a current-limiting resistor. The stepped-down sinusoidal signal is sent to D15, D16, and C84 for half-wave rectification to obtain a DC voltage. The DC voltage is processed by the voltage divider network composed of R34, R35, and R35 to obtain a unipolar voltage signal that is sent to the AD port of the microcontroller for reading. The 4MHz current passes through the current acquisition transformer composed of T7, T8, and T5, and outputs a voltage signal at the secondary of the transformer. R31 is a current-limiting resistor. The sinusoidal signal is sent to D21, D22, and C87 for half-wave rectification to obtain a DC voltage. The DC voltage is processed by the voltage divider network composed of R41 and R42 to obtain a unipolar current signal that is sent to the AD port of the microcontroller for reading.

[0070] Relays K1 and K2 are controlled by the single-chip microcomputer to select the output power of different working modes. When K1 and K2 are energized, they transmit bipolar voltage and current signals. When K1 and K2 are energized, they transmit unipolar voltage and current signals.

[0071] The single chip microcomputer calculates the load resistance based on the voltage and current signals obtained, and adjusts the output power when the load resistance changes. The sampling formula under the circuit structure is:

[0072] a. For the high-frequency voltage acquisition circuit, the primary-to-secondary turns ratio nv of the voltage acquisition transformer T1, the Schottky diode voltage drop vd of D16, D18, D20, and D22, the ratio k of R6 and R10, the ratio p set by the R2 sliding resistor cursor, the compensation coefficients e1 and e2 of the circuit at both ends of the transformer isolation, the ad value adv read at the microcontroller sampling voltage input, the reference voltage ref, and the number of bits of sampling accuracy d. The formula for calculating the measured high-frequency output voltage peak HV is HV = ((adv* *ref*p*k) / 2^d +2*vd+e1)*nv+e2).

[0073] b. For high-frequency current acquisition, the primary-to-secondary turns ratio (ni) of the current acquisition transformer T5, the Schottky diode voltage drop (vd) of D17 and D21, the sliding resistor setting ratio (pi) of sampling resistors R5, R1, or R3, the current sample value (iad) read at the microcontroller sampling input, the reference voltage (ref), the number of bits of sampling accuracy (d), and the transformer isolation circuit compensation coefficients (e3 and e4). The formula for calculating the measured high-frequency output current peak value (HI) is HI = ((adi*ref*pi) / 2^d +2*vd+e3)*ni+e4).

[0074] To ensure accurate and stable sampling, filtering is required based on the voltage and current calculated by the above sampling circuit. For the high-frequency 4M or 1.7M signal in the power output stage, this sampling algorithm designs a power segmented sampling method, combining the sliding average filtering algorithm and low-pass filtering to process the sampling results. Specifically:

[0075] The voltage signal or current signal is divided into a first power segment and a second power segment according to a preset power level, and first sampling data and second sampling data are obtained according to the first power segment and the second power segment respectively; the first sampling data is filtered once based on a sliding average filtering algorithm, a filtering window is set, a maximum sampling value advmax and a minimum sampling value advmin are extracted and filtered, the first sampling data after filtering in the filtering window are averaged, and a filtered first sampling result adv=(sum(adv[0]~ adv[n-1])-(advmax+advmin)) / (n-2) of the current sampling point is calculated; the first sampling data in the filtering window is shifted to the next target position, and the above filtering operation is repeated until all sampling points are filtered; the second sampling data is filtered twice based on a low-pass filtering algorithm, and a filtered second sampling result adv=a*cur_adv+(1-a)last_adv is calculated; wherein the filtering window includes a preset number of sampling values adv[0] and adv[1]. adv[n-1], n is the number of sampling times, cur_adv is the current actual sampling value, last_adv is the last filtered sampling result, a is the filter coefficient set according to the frequency to be filtered, and the first sampling data and the second sampling data are both voltage and current data. The overall sampling algorithm process is as follows Figure 3 shown.

[0076] For example, for sampling at a power output level of 0-50, take voltage acquisition adv as an example, sampling number n, sampling data adv[0], adv[1].. adv[n-1], first calculate the maximum value advmax and the minimum value advmin, and then use them to calculate the filtered voltage sampling of the high-frequency voltage: adv=(sum(adv[0]~adv[n-1])-(advmax+advmin)) / (n-2),

[0077] For power output levels of 51-100, due to the large power output, interference fluctuations are prone to occur in the face of continuous changes in actual human tissue. A low-pass filtering algorithm adv=r*cur_adv+(1-a)last_adv is used, where a is the filter coefficient determined by the frequency to be filtered out and ranges from [0,1]. cur_adv is the current actual sampling value, and last_adv is the last filtered sampling result.

[0078] Based on the sampled voltage and current, we can calculate the external impedance Z = HV / HI. Based on the sinusoidal output high-frequency waveform P = HV*HI, the power calculated by sampling is compared with the set power, thereby adjusting the PWM duty cycle of the power drive control module to keep the output power within the set power range. That is, the load resistance is calculated according to the obtained voltage signal and current signal, and the target control power under different working modes is adjusted according to the change of the load resistance and based on the preset control algorithm, including: when the external measured human body impedance changes, the voltage HV and the current HI of the high-frequency electric knife device are obtained, and the current actual power is output based on the sine; the currently calculated power is compared with the set power threshold, and the k-1 power error results are calculated; the drive change value △duty =kp*err(k)-err(k-1)+kd(err(k)-err(k-1)) is calculated according to the k-1 power error results; when the power error value is greater than 0, the currently calculated power is less than the set power threshold, and the output target drive value is increased to achieve the target control power; when the power error value is less than 0, the currently calculated power is greater than the set power threshold, and the output target drive value is reduced to achieve the target control power; wherein, the target drive value duty(k)=duty(k-1)+ △duty, kp is the error proportional coefficient, and kd is the differential coefficient.

[0079] This field can be understood as, see Figure 4 As shown, the specific control algorithm implemented above uses PD sampling. The current error err(k) = Pset(k) - P(k), the previous error err(k-1) = Pset(k-1) - P(k-1), and the previous error err(k-2) = Pset(k-2) - P(k-2). Conventional high-frequency electrosurgical units detect output power by sampling the DC current. However, due to the high frequency of the electrosurgical unit, the DC current value does not accurately reflect the current output power of the electrosurgical unit and cannot determine the current load resistance. This results in incomplete closed-loop control of the electrosurgical unit's power output. In the presence of varying resistance and impedance, unstable output can potentially cause surgical accidents such as burns. The aforementioned target power control method can overcome these limitations, stabilizing output and preventing burns. Another control algorithm can be the PID algorithm. Its execution process uses feedback to detect a deviation signal and uses this deviation signal to control the controlled variable. The controller itself is the sum of three steps: proportional, integral, and differential. Consider a specific time t, where the input is rin(t) and the output is rout(t), then the deviation can be calculated as err(t)=rin(t)-rout(t). The basic control law of PID can then be expressed as the following formula: , where Kp is the proportional band, TI is the integration time, T D is the differential time. This is the basic principle of PID control. Assume that the system sampling period is T. Suppose we examine the Kth sampling period. Clearly, the system performs the Kth sampling. The deviation at this point can be expressed as err(K) = rin(K) - rout(K). The integral can then be expressed as: err(K) + err(K+1) + ┈┈, and the differential can be expressed as: (err(K) - err(K-1)) / T. Proportional control is used to respond to system deviations, so as long as there is a deviation, proportional control will take effect. Integral control is primarily used to eliminate static error. The so-called static error refers to the difference between the input and output that remains after the system stabilizes. Integral control offsets the system's static error by accumulating the deviation. Differential control, on the other hand, responds to the changing trend of the deviation, enabling advanced regulation based on the deviation trend and improving response speed.

[0080] In one embodiment of the present invention, see Figure 5 As shown, in order to synchronize the operation of the electric knife, the high-frequency electric knife is designed with an integrated smoker, and the suction force is adjusted by controlling the speed of the fan through the control panel of the electric knife, that is, the smoke purification device also includes a smoker assembly integrated on the circuit board, and the smoker assembly includes a sterile suction tip 1, an external detachable filter 2, a first built-in filter 3, a second built-in filter 4 and a plurality of connecting pipes. One end of the sterile suction tip 1 is close to the end of the high-frequency electric knife head to absorb smoke released during surgery, and the other end of the sterile suction tip 1 is connected to one end of the external detachable filter 2 through a first connecting pipe 5. The other end of the external detachable filter 2 is connected to one end of the first built-in filter 3 through a second connecting pipe 6. The other end of the first built-in filter 3 is connected to one end of the brushless motor through a third connecting pipe 7. The other end of the brushless motor is connected to one end of the second built-in filter 4 through a fourth connecting pipe 8. After the absorbed surgical smoke is filtered through multiple stages, the other end of the second built-in filter 4 discharges the filtered gas through a fifth connecting pipe 9. It can be understood that the above-mentioned smoking component is composed of a sterile suction head 1, a first connecting tube 5 with a smoke particle sensor, an external detachable filter 2, a second connecting tube 6, a first built-in filter 3, a third connecting tube 7, a brushless fan, a fourth connecting tube 9, a second built-in filter 4, and a fifth connecting tube 10 with a smoke particle sensor. When the brushless fan rotates, negative pressure is generated, and the smoke generated during the operation is sucked into the filter through the connecting tube, and harmless gas is discharged after passing through multiple filters. The start and stop and speed of the brushless fan are controlled by the microcontroller of the high-frequency electric knife motherboard. When the pedal of the electric knife is stepped on, the brushless fan starts to work. The speed of the fan can be adjusted automatically or manually according to different working modes, so as to achieve smoking while avoiding severe heating of the fan.

[0081] In linkage mode, the device monitors the status of the high-frequency electrosurgical unit to determine its operating status and mode, synchronizes the start and stop of the high-frequency electrosurgical unit and the smoke extraction function, and automatically adjusts the speed of the built-in brushless blower to adjust suction according to different application scenarios. The speed is dynamically adjusted based on smoke concentration, monitored by a smoke particle sensor module located at the transition between the inner and outer connecting tubes, ensuring efficient smoking in a low-noise environment. The smoke particle sensor module installed at the transition between the inner and outer connecting tubes refers to the smoke particle sensor module installed at the input end of the first connecting tube and the output end of the fifth connecting tube. The smoke extraction device operates in two modes: linkage and manual. In linkage mode, the smoke extraction device module simultaneously monitors the status of the high-frequency board, including but not limited to detecting the voltage, current, and relay status of the high-frequency drive circuit and high-frequency output terminal to comprehensively determine the device's operating status and mode, thereby controlling the start and stop of the smoke extraction device and setting a baseline speed. Furthermore, after the smoke extraction device is started, a smoke particle sensor module is installed at the front end of the smoke extraction device to monitor smoke concentration and dynamically adjust the speed to ensure efficient smoking while minimizing noise levels. In manual mode, the smoke extraction device starts and stops the speed according to user settings.

[0082] The external removable filter 2, first internal filter 3, and second internal filter 4 all utilize ULPA filters, enhancing filtration efficiency and extending the lifespan of the internal filter elements. After primary filtration, the external removable filter 2 can be easily replaced externally, while the first and second internal filters 3 and 4 offer extended usability. During operation, the inhaler is connected to the housing via a pipe. During surgery, the external inhaler is piped over the surgical site to draw smoke. Alternatively, the inhaler can be attached to the surgical head and connected to the inhaler on the electrosurgical unit using an adapter. The principle of this embodiment is to integrate a smoke purification device into a high-frequency electrosurgical unit. The smoke purification device uses ULPA filtration technology and includes an external detachable filter 2 and two built-in filters. The particle purification level is as low as 0.1 μm, which can remove 99.999% of smoke pollutants from the surgical site, isolate the diffusion of surgical smoke at the source, and protect the health of medical staff. The control board of the smoke purification device is combined with the main board of the high-frequency electrosurgical unit to realize digital intelligent control, synchronize the start and stop of the high-frequency electrosurgical unit and the smoke purification function, and automatically adjust the speed of the built-in fan to adjust the suction force according to different application scenarios, thereby ensuring smoke purification efficiency, facilitating surgical operations, reducing the space occupied by the equipment, and effectively reducing the equipment usage costs of the hospital.

[0083] In order to realize the filter element life detection and replacement reminder function and obtain the filtering effect in real time, the smoke purification device also includes a filter element life detection module, which is used to detect the usage parameters of the filter element, predict the remaining service life of the filter element and obtain the filtering effect in real time. The specific calculation method is: obtain the usage parameters of the filter element, the usage parameters include the expected life of the filter element, actual usage time, fan speed, smoke intake volume of the front-end smoke sensor and smoke exhaust volume of the rear-end smoke sensor.

[0084] Conventional neutral electrode detection circuits can only detect whether a neutral electrode is inserted, but cannot measure the neutral electrode's contact impedance. If the neutral electrode doesn't make proper contact, the patient may be at risk of burns. To address this issue, the high-frequency electrosurgical device in the present invention further includes a neutral electrode detection circuit connected to the control module. This neutral electrode detection circuit is controlled by a single-chip microcomputer and generates a sine wave through self-oscillation of a transistor. This simplifies the circuit and reduces hardware costs.

[0085] When the impedance at both ends of the neutral electrode changes, the voltage at the input end of the impedance measurement circuit will change. This voltage is transmitted to the rectifier circuit through the transformer to obtain a DC voltage. The DC voltage is sent to the microcontroller for reading and judgment. When the impedance at both ends of the neutral electrode reaches Rmax, the voltage drops to Vmin, and the microcontroller issues a prompt that the neutral electrode impedance is too high. When the neutral electrode impedance is within the allowable range, the microcontroller displays the neutral electrode impedance on the screen to prompt the operator.

[0086] Specifically, it is connected to both ends of the neutral electrode through connector J8, and the signal is transmitted to transformer T1 through current-limiting resistors RN1 and RN2. One end of the secondary of the transformer is connected to 12V, and the other end is connected to the self-excited oscillation circuit composed of CN8, CN4, CN2, CN3, QN1, RN4, and RN3. A sinusoidal voltage with a frequency of about 120kHz is generated on the left side of CN5. When the impedance at both ends of the neutral electrode is 0, the amplitude of this sinusoidal voltage is the largest. When the impedance increases, the amplitude of the sinusoidal voltage decreases accordingly. After the sinusoidal voltage passes through CN5, it is converted into a DC voltage by the rectifier and filter circuit composed of DN1, DN2, RN5, CN6, RN6, and CN7. After this DC voltage is divided by potentiometer RN7, it is sent to the AD port of the microcontroller of the control module for collection and reading. CN1 and CN2 are 12V filter capacitors, and DN3 and RN3 form a 12V power indicator light.

[0087] After receiving the DC signal, the microcontroller reads the amplitude of the current voltage, determines the impedance, and displays it on the screen. When the impedance is greater than a certain value, it emits sound and light to remind the operator. When the impedance is too large, the power output is cut off.

[0088] The detection method of the above neutral electrode detection circuit includes: defining a first voltage threshold V1, a second voltage threshold V2, and a third voltage threshold V3 under different scenarios of the collected voltage. When the current voltage amplitude V read by the control module is greater than the first voltage threshold V1 and less than the second voltage threshold V2, it is determined that the impedance between the two ends of the neutral electrode is within the preset impedance threshold range, then the neutral electrode is in a normal contact state, and the contact impedance value is displayed; when the current voltage amplitude V read by the control module is greater than the second voltage threshold V2, it is determined that the impedance between the two ends of the neutral electrode is greater than the preset impedance threshold, then the neutral electrode is in an abnormal contact state, an abnormal reminder is issued, it is shown that the contact impedance of the neutral electrode is too large, and the power output is prohibited until the neutral electrode is in a normal state; when the current voltage amplitude read by the control module is the same as the third voltage threshold V3, it is determined that the impedance between the two ends of the neutral electrode is greater than the preset impedance threshold, then the neutral electrode is in an unconnected state, a prompt that the neutral electrode is not connected is issued, and the power output is prohibited at the same time until the neutral electrode is connected and in a normal state; wherein, the first voltage threshold V1 is the voltage value collected when the neutral electrode is in full contact with the measured human body, the second voltage threshold V2 is the voltage value collected when the neutral electrode is in abnormal contact with the measured human body, and the third voltage threshold V3 is the voltage value collected when the neutral electrode is not connected to the measured human body, and the magnitude relationship of the voltage values is: V1 < V2 < V3.

[0089] The following is an example: when the neutral electrode is in full contact with the human body, the contact impedance at this time is the lower limit value R1, such as 20Ω, and the collected voltage is V1; when the contact between the neutral electrode and the human body is poor, the impedance is greater than the upper limit value R2, such as 120Ω, and the collected voltage is V2; when the contact impedance between the neutral electrode and the human body is between 20 - 120Ω, the collected voltage is V4; when the neutral electrode is not connected, the collected voltage is V3; the magnitude relationship of the voltage values is: V1 < V4 < V2 < V3; the calculation formula of the contact impedance R is: R = k * V, where k is the voltage division coefficient of the circuit; when the voltage value V read by the single-chip microcomputer satisfies V1 < V < V2, it is determined that the contact quality is good, and the contact impedance value is displayed on the screen; when V > V2, it is determined that the contact quality is poor, the operation cannot be performed, an audible and visual prompt is issued, the screen shows that the contact impedance of the neutral electrode is too large, and the power output is prohibited at the same time until the neutral electrode is pasted well and the collected voltage V < V2 can the power output be performed; when V = V3, it is determined that the neutral electrode is not connected, at this time an audible and visual prompt is issued, the screen shows that the neutral electrode is not connected, and the power output is prohibited at the same time until the neutral electrode is connected and the contact quality is good can the power output be performed; during the operation, when the increase in the measured contact impedance compared to the measured value R at the start of the operation is greater than 40%, an audible and visual prompt is also issued, the screen shows that the contact impedance of the neutral electrode is too large, and the power output is stopped at the same time.

[0090] The output power frequency of high-frequency electrosurgical units is as high as 1.7MHz and 4MHz, and the output power is as high as 100W. When the electrosurgical unit is working, it will generate considerable high-frequency interference, affecting the normal operation of other equipment (such as CT). Ordinary electrosurgical units only rely on AC socket filters to suppress high-frequency interference, which cannot effectively suppress high-frequency interference under high-power conditions. To solve the above problem, see Figure 6 As shown, one embodiment of the present invention suppresses high-frequency interference on AC transmission lines by connecting a high-frequency magnetic ring after the AC outlet. Wrapping wires around the ring creates a common-mode inductor, further eliminating the propagation of high-frequency interference. The AC input power line is inserted into a power filter CW2E-10A-T. At the filter's output, the power line is wrapped three turns around the high-frequency magnetic ring and secured with a cable tie. This filters the high-frequency interference generated by the high-frequency electrosurgical unit and prevents it from transmitting to other devices through the power line.

[0091] The high-frequency electrosurgical unit control system provided by the present invention also includes a display module, which mainly provides a way of human-computer interaction and can be adjusted by touch. It displays the required power, working mode, fan suction, and error reporting.

[0092] Example 2

[0093] Based on the same inventive concept, the present invention also provides a control method for a high-frequency electrosurgical unit control system with a surgical smoke purification function, which is used to control the high-frequency electrosurgical unit control system with a surgical smoke purification function as described in the first embodiment;

[0094] The control method includes:

[0095] When the linkage mode is started, the device status of the high-frequency electrosurgical device is monitored to determine the device working status and mode, and the smoke purification device and the high-frequency electrosurgical device are automatically started and stopped;

[0096] When the high-frequency electrosurgical unit is activated, the load resistance is calculated based on the acquired voltage and current signals. The load resistance change determines whether the device is abnormal. The target control power in different operating modes is adjusted based on the preset control algorithm to control the functional output of the high-frequency electrosurgical unit.

[0097] When the smoke purification mode is started, the speed of the built-in brushless fan is automatically adjusted to adjust the suction force according to different application scenarios. The smoke concentration is monitored and the speed is dynamically adjusted according to the smoke particle sensor module configured in the transition part inside and outside the connecting pipe to ensure the smoking efficiency of the smoke purification device in a low-noise environment.

[0098] Furthermore, judging whether the device state is abnormal according to the change in load resistance includes:

[0099] Define the first voltage threshold V1, the second voltage threshold V2 and the third voltage threshold V3 under different voltage acquisition scenarios,

[0100] When the current voltage amplitude V read by the control module is greater than the first voltage threshold V1 and the current voltage amplitude is less than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is within the preset impedance threshold range, and the neutral electrode is in a normal contact state, and the contact impedance value is displayed;

[0101] When the current voltage amplitude V read by the control module is greater than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, and the neutral electrode is in an abnormal contact state. An abnormality reminder is issued, indicating that the neutral electrode contact impedance is too large, and power output is prohibited until the neutral electrode is in a normal state.

[0102] When the current voltage amplitude read by the control module is the same as the third voltage threshold V3, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, indicating that the neutral electrode is disconnected. A neutral electrode disconnection prompt is issued, and power output is prohibited until the neutral electrode is connected and is in a normal state.

[0103] Among them, the first voltage threshold V1 is the voltage value collected when the neutral electrode is in full contact with the measured body, the second voltage threshold V2 is the voltage value collected when the neutral electrode is in abnormal contact with the measured body, and the third voltage threshold V3 is the voltage value collected when the neutral electrode is not connected to the measured body, and the voltage value size relationship is: V1 <V2<V3。

[0104] Example 3

[0105] Based on the same inventive concept, the present invention also provides a high-frequency electric knife, including the high-frequency electric knife control system with surgical smoke purification function as described in the above embodiment 1. The control system is installed on the host and will not be described in detail here.

[0106] The above description is only a description of the preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the technical solution of the present invention. Any changes and modifications made by ordinary technicians in the field of the technical solution of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A high-frequency electrosurgical knife control system with surgical smoke purification function, characterized in that: It includes a control module and a power supply system, a smoke purification device and a high-frequency electric knife device electrically connected to the control module. The power supply system includes a filter and multiple power supply modules. After AC input and filtering by the filter, it is divided into multiple power supply modules adapted to the high-frequency electrosurgical device and the smoke purification device, and is used to independently power the control module, the smoke purification device and the power modules in different modes; The high-frequency electrosurgical device includes a DC step-down module, a high-frequency inverter module, a single-pole and double-pole switching circuit, and a plurality of electrodes. The DC step-down module and the high-frequency inverter module are electrically connected in sequence to control the target power supply and AC-DC conversion. At the same time, the high-frequency inverter module is controlled by a high-frequency drive module connected to the control module. The high-frequency inverter module and the single-pole and double-pole switching circuit are connected to different output electrodes to achieve integration and switching of single-pole and double-pole modes. The smoke purification device includes a fan control module and a fan electrically connected in sequence, which is used to control the fan start and stop speed according to different working modes to control the suction force of the purified smoke, thereby synchronizing the working state of the high-frequency electric knife control system to realize the linkage mode; The control module includes a high-frequency current and voltage acquisition module and a high-frequency signal processing module, which respectively obtain current and voltage signals from the bipolar output electrode end, the unipolar output electrode end and the neutral electrode end and input them into the high-frequency current and voltage acquisition module, and then pass through the high-frequency signal processing module to the control module. The control module is used to control the start-up linkage mode, monitor the device status of the high-frequency electric knife device, judge the device working status and mode, synchronize the start and stop of the high-frequency electric knife and the smoke purification function, and calculate the load resistance value according to the obtained voltage signal and current signal when starting the smoke purification mode, judge whether the device status is abnormal according to the change of the load resistance value, and adjust the target control power in different working modes based on the preset control algorithm.

2. The high-frequency electrosurgical unit control system with surgical smoke purification function according to claim 1, characterized in that: The smoke purification device also includes a smoking assembly integrated on the circuit board, the smoking assembly including a sterile suction head, an external detachable filter, a first built-in filter, a second built-in filter and a plurality of connecting pipes, one end of the sterile suction head is close to the end of the high-frequency electric knife head to absorb smoke released during surgery, the other end of the sterile suction head is connected to one end of the external detachable filter via a first connecting pipe, the other end of the external detachable filter is connected to one end of the first built-in filter via a second connecting pipe, the other end of the first built-in filter is connected to one end of the brushless motor via a third connecting pipe, and the other end of the brushless motor is connected to one end of the second built-in filter via a fourth connecting pipe. After the absorbed surgical smoke is filtered through multiple stages, the other end of the second built-in filter discharges the filtered gas through a fifth connecting pipe channel; In operation, the brushless fan rotates to generate negative pressure, which draws smoke generated during surgery into the filter through the pipeline channel. After multi-stage filtration by multiple filters, harmless gas is discharged. After the brushless fan starts working, the speed of the brushless fan is automatically or manually adjusted according to the different working modes. In linkage mode, the device status of the high-frequency electric knife device is monitored to determine the device working status and mode, the start and stop of the high-frequency electric knife and the smoke purification function are synchronized, the speed of the built-in brushless fan is automatically adjusted to adjust the suction force according to different application scenarios, and the speed is dynamically adjusted by monitoring the smoke concentration based on the smoke particle sensor module configured at the transition part inside and outside the connecting pipe.

3. The high-frequency electrosurgical unit control system with surgical smoke purification function according to claim 1, characterized in that: The high-frequency electrosurgical device further includes a neutral electrode detection circuit connected to the control module. The detection method of the neutral electrode detection circuit includes: Define the first voltage threshold V1, the second voltage threshold V2 and the third voltage threshold V3 under different voltage acquisition scenarios, When the current voltage amplitude V read by the control module is greater than the first voltage threshold V1 and the current voltage amplitude is less than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is within the preset impedance threshold range, and the neutral electrode is in a normal contact state, and the contact impedance value is displayed; When the current voltage amplitude V read by the control module is greater than the second voltage threshold V2, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, and the neutral electrode is in an abnormal contact state. An abnormality reminder is issued, indicating that the neutral electrode contact impedance is too large, and power output is prohibited until the neutral electrode is in a normal state. When the current voltage amplitude read by the control module is the same as the third voltage threshold V3, it is determined that the impedance across the neutral electrode is greater than the preset impedance threshold, indicating that the neutral electrode is disconnected. A neutral electrode disconnection prompt is issued, and power output is prohibited until the neutral electrode is connected and is in a normal state. Among them, the first voltage threshold V1 is the voltage value collected when the neutral electrode is in full contact with the measured body, the second voltage threshold V2 is the voltage value collected when the neutral electrode is in abnormal contact with the measured body, and the third voltage threshold V3 is the voltage value collected when the neutral electrode is not connected to the measured body, and the voltage value size relationship is: V1 <V2<V3。 4. The high-frequency electrosurgical unit control system with surgical smoke purification function according to claim 1, characterized in that: The method of calculating the load resistance value according to the obtained voltage signal and current signal includes: Dividing the voltage signal or the current signal according to a preset power level to obtain a first power segment and a second power segment, and acquiring first sampled data and second sampled data according to the first power segment and the second power segment respectively; Filter the first sampling data based on a sliding average filtering algorithm, set a filtering window, extract the maximum sampling value advmax and the minimum sampling value advmin, and filter them. Average the filtered first sampling data within the filtering window to calculate the filtered first sampling result adv=(sum(adv[0]~ adv[n-1])-( advmax+advmin)) / (n-2) for the current sampling point. Shifting the first sample data in the filtering window to the next target position, and repeating the above filtering operation until all sample points are filtered; Perform secondary filtering on the second sampling data based on a low-pass filtering algorithm, and calculate the filtered second sampling result adv=a*cur_adv+(1-a)last_adv; Among them, the filtering window includes sampling values adv[0], adv[1].. adv[n-1] of a preset number of bits, n is the number of sampling times, cur_adv is the current actual sampling value, last_adv is the last filtering sampling result, a is the filtering coefficient set according to the frequency to be filtered out, and the first sampling data and the second sampling data are both voltage and current data.

5. The high-frequency electrosurgical unit control system with surgical smoke purification function according to claim 1, characterized in that: The calculation of the load resistance value based on the acquired voltage signal and current signal, determining whether the device state is abnormal based on the change of the load resistance value, and adjusting the target control power in different working modes based on the preset control algorithm include: When the external measured human body impedance changes, the voltage HV and the current HI of the high-frequency electrosurgical device are obtained, and the current actual power is output based on the sine wave. Compare the currently calculated power P(k) with the set power threshold Pset(k) to calculate the k-th and k-1-th power error results; The driving change value △duty = kp* err(k)- err(k-1)+kd(err(k)-err(k-1)) is calculated based on the kth and k-1th power error results. When the power error value is greater than 0, the currently calculated power is less than the set power threshold, and the output target drive value is increased to achieve the target control power; When the power error value is less than 0, and the currently calculated power is greater than the set power threshold, the output target drive value is reduced to achieve the target control power; The target driving value duty(k)=duty(k-1)+Δduty, the power error value err(k)=Pset(k)-P(k), kp is the error proportional coefficient, and kd is the differential coefficient.

6. The high-frequency electrosurgical unit control system with surgical smoke purification function according to claim 1, characterized in that: The high-frequency electric knife device further includes a first transformer, a first resonant circuit, a second transformer and a second resonant circuit. The branch of the monopolar-bipolar switching circuit is connected to the bipolar output electrode together with the first transformer and the first resonant circuit, and is used to perform electrocuting and electrocoagulation operations by flowing a high-frequency and high-voltage current between the two poles of a bipolar instrument to achieve a bipolar mode; The other branch of the monopolar and bipolar switching circuit is connected to the monopolar output electrode together with the second transformer and one end of the second resonant circuit. The other end of the second resonant circuit is connected to the input end of the neutral electrode to form a loop. The output end of the neutral electrode is connected to the neutral electrode detection circuit and fed back to the control module. The output end of the monopolar output electrode is connected to the handle detection circuit and fed back to the control module, which is used to detect circuit abnormalities in the monopolar mode and use the heat energy and discharge released by the high-frequency current to cut and stop bleeding on the tissue to achieve the monopolar mode.

7. A high-frequency electric knife, characterized in that: It comprises a high-frequency electric knife control system with a surgical smoke purification function as described in any one of claims 1 to 6.

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