Low-temperature plasma radio frequency operation system and method

Abstract

The invention discloses a low-temperature plasma radio frequency operation system and method, and aims to solve the problems of unstable temperature control, complex operation, high maintenance cost and single working mode in the prior art. The system comprises a surgical electrode and a host, the surgical electrode adopts a multi-pole design and comprises at least two working poles and a loop pole, and different surgical requirements are met; a main control unit, a radio frequency energy generation circuit, a multi-pole control unit, a temperature closed-loop control unit, a man-machine interaction module and a maintenance management module are integrated in a radio frequency ablation power supply in the host. According to the method, an operation is achieved through electrode recognition, mode matching, energy output control, temperature closed-loop adjustment, man-machine interaction and state monitoring. The working modes are switched through multi-pole control to adapt to complex scenes, temperature fluctuation is controlled within a small range through temperature closed-loop control, the operation process is simplified, the maintenance cost is reduced, and the system is suitable for various surgical operations.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a low-temperature plasma radio frequency surgical system and method. BACKGROUND

[0002] Low-temperature plasma radio frequency technology generates plasma by high-frequency electric field excitation of dielectric, realizing cutting, ablation and hemostasis of tissue. It is widely used in surgical operations due to its advantages of small trauma and fast recovery. However, the existing technology still has the following problems: Unstable temperature control: the output of radio frequency energy of the traditional system fluctuates greatly, resulting in high and low tissue temperature, which easily causes non-target tissue thermal injury and increases the risk of postoperative complications; High complexity of operation: the human-computer interaction interface is not intuitive, the surgical mode switching is cumbersome, and the medical staff needs to frequently adjust parameters, which affects the operation efficiency; High maintenance cost: the device components are not durable, the fault detection relies on manual inspection, and there is no predictive maintenance mechanism, resulting in long downtime and high maintenance cost; Single working mode: the working pole and return pole of the surgical electrode are fixed in the activation mode, which is difficult to adapt to the fine operation requirements of complex or narrow surgical environments (such as adenoidectomy in ear-nose-throat surgery and minimally invasive surgery in orthopedics), and normal tissues are easily damaged.

[0003] Therefore, there is an urgent need for a low-temperature plasma radio frequency surgical method and system that can achieve precise temperature control, simplify operation, reduce maintenance cost, and adapt to multiple scenarios. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a low-temperature plasma radio frequency surgical system and method to realize stable temperature control, simplify the operation process, reduce the maintenance cost, and adapt to multiple complex surgical scenarios.

[0005] To achieve the above purpose, the present application provides the following technical solutions: A low-temperature plasma radio frequency surgical system, comprising a surgical electrode and a host, wherein the host is integrated with a radio frequency ablation power supply; The surgical electrode comprises at least two working poles and at least one return pole; specifically, the surgical electrode adopts a multi-pole design, the working poles and the return pole are isolated by insulating material, the working pole end is needle-shaped or knife-shaped to adapt to different tissue cutting / ablation requirements, and the return pole is designed as a ring or a flat plate to expand the contact area and reduce the current density concentration.

[0006] The radio frequency ablation power supply comprises: A master control unit is configured to output control signals in a system operation process; the master control unit adopts a 32-bit ARM microprocessor, an integrated FPGA chip is used for high-speed signal processing, and the master control unit communicates with each module through an SPI bus to analyze a surgical type and electrode configuration parameters in real time.

[0007] The radio frequency energy generation circuit comprises a network power supply module, a voltage reduction module and a voltage conversion module connected in sequence, the voltage reduction module is configured to reduce a direct current signal to a target low-voltage direct current signal, and the voltage conversion module is configured to convert the target low-voltage direct current signal into a radio frequency signal; the network power supply module inputs 220V alternating current, and outputs 310V direct current after EMI filtering and rectification; the voltage reduction module comprises at least two forward converters and a forward converter cooperation module, the forward converter cooperation module is configured to make the output voltages of the forward converters consistent, the forward converters adopt a UC3845 control chip, voltage closed-loop control is realized through optical coupling feedback, the forward converter cooperation module adjusts the duty cycles of the converters through a current-sharing resistor and an error amplifier to ensure that the output voltage difference is reduced; the voltage conversion module comprises at least two push-pull inverters and a push-pull synchronization module, the push-pull synchronization module is configured to make the output voltages of the push-pull inverters in phase, the push-pull inverters adopt an IR2110 driving chip, the push-pull synchronization module synchronizes the switching time sequences of the two inverters through a phase-locked loop circuit, and outputs a radio frequency signal with an adjustable frequency of 100kHz-5MHz and an amplitude of 0-500Vpp, and the voltage reduction module and the voltage conversion module are connected with the temperature closed-loop control unit, and the output power is adjusted according to the temperature.

[0008] The multi-pole control unit is electrically connected with the master control unit, the voltage conversion module and the surgical electrode respectively, is configured to determine an electrode operation mode according to surgical type information and surgical electrode information, and control the radio frequency signal to be output to the surgical electrode according to the mode, and the electrode operation mode indicates selective activation of working poles and return poles; the multi-pole control unit is internally provided with a surgical type-electrode mode mapping table, an electrode connection path is switched through a relay array, when the temperature closed-loop control unit detects that the tissue temperature is out of limit, the master control unit triggers protection logic, and automatically switches to a mode in which a smaller number of working poles are activated to reduce the energy density.

[0009] The temperature closed-loop control unit is connected with the master control unit, the radio frequency energy generation circuit and the surgical electrode, is configured to detect tissue temperature in real time and adjust radio frequency energy output to maintain stable temperature; specifically comprising: A temperature sampling module is configured to collect real-time tissue temperature of a surgical area; a patch-type NTC thermistor (resistance 10kΩ±1%, B value 3950K) is embedded at the root of the working pole, the sampling frequency is 100Hz, and the temperature is transmitted to the master control unit after common-mode interference is eliminated through a differential amplification circuit.

[0010] A temperature comparison module is configured to calculate the difference between the real-time temperature and a preset target temperature, and the preset target temperature is set according to the type of surgery, and the temperature comparison module is configured to calculate the temperature difference ΔT by using a PID algorithm, and a regulation signal is triggered when ΔT is greater than or less than ±3℃.

[0011] An energy regulation module is connected with the radio frequency energy generation circuit, and is configured to adjust the output parameters of the voltage reduction module or the voltage conversion module according to the difference result, so as to dynamically adjust the radio frequency energy; the energy regulation module is configured to adjust the duty ratio of the forward converter or the switching frequency of the push-pull inverter through a PWM signal, so that the radio frequency power is continuously adjustable between 0 and 50W, and the temperature fluctuation is controlled within ±2℃.

[0012] A human-computer interaction module is connected with the main control unit, and is configured to display the surgical parameters and receive operation instructions, so as to simplify the operation process; specifically, the human-computer interaction module comprises: A touch display unit is configured to display the real-time temperature, the electrode working mode, the radio frequency energy parameters and the surgical step guide information; a 7-inch capacitive touch screen is adopted, and the interface is displayed in layers: the main interface displays the temperature curve, the current mode and the power / frequency parameters; the sub-interface provides the surgical step guide and supports Chinese / English switching.

[0013] An intelligent instruction unit is configured to receive the mode switching and parameter adjustment instructions input by the user, and feed back to the main control unit for execution, and simultaneously has an operation error early warning function; the intelligent instruction unit is configured to recognize the gesture operation through the touch screen, and has a built-in instruction verification algorithm; if an illegal instruction is detected, a warning box is popped up immediately and the operation interface is locked.

[0014] A maintenance management module is connected with the main control unit and the radio frequency energy generation circuit, and is configured to monitor the component state and reduce the maintenance cost; specifically, the maintenance management module comprises: A fault detection unit is configured to monitor the running state of the voltage reduction module, the voltage conversion module and the surgical electrode in real time, and generate fault diagnosis information; the output current of the forward converter / push-pull inverter is monitored through a current sensor, the radio frequency output voltage is monitored through a voltage sensor, and the contact state of the surgical electrode with the tissue is judged through impedance detection; if the current is greater than 8A or the voltage is less than 400V for more than 3 seconds, it is determined that the “power module is overloaded”; if the electrode impedance is greater than 2000Ω, it is determined that the “electrode does not contact the tissue”.

[0015] A life prediction unit is configured to predict the replacement cycle of the vulnerable components based on the cumulative working time and performance degradation data of the components, and send a reminder; a component life model is established, and when the cumulative working time reaches 2000 hours or the performance parameter triggers the threshold, a “suggestion to replace the voltage reduction module” prompt is popped up through the touch display unit, and the fault log is recorded to the local storage.

[0016] Preferably, the temperature closed-loop control unit comprises: a temperature sampling module configured to collect real-time tissue temperature of a surgical area; a temperature comparison module configured to calculate a difference between the real-time temperature and a preset target temperature; an energy adjustment module connected with the radio frequency energy generation circuit, configured to adjust output parameters of the voltage reduction module or the voltage conversion module according to the difference result, so as to dynamically adjust the radio frequency energy.

[0017] Preferably, the human-computer interaction module comprises: a touch display unit configured to display the real-time temperature, the electrode working mode, the radio frequency energy parameters and the surgical step guidance information; an intelligent instruction unit configured to receive mode switching and parameter adjustment instructions input by a user and feed back to the main control unit for execution, and simultaneously has an operation error early warning function.

[0018] Preferably, the maintenance management module comprises: a fault detection unit configured to monitor the running state of the voltage reduction module, the voltage conversion module and the surgical electrode in real time, and generate fault diagnosis information; a life prediction unit configured to predict the replacement cycle of the vulnerable components based on the cumulative working time and performance degradation data of the components, and issue a reminder.

[0019] Preferably, the voltage reduction module comprises at least two forward converters and a forward converter cooperation module, the forward converter cooperation module is configured to make the output voltages of the forward converters consistent; the voltage conversion module comprises at least two push-pull inverters and a push-pull synchronization module, the push-pull synchronization module is configured to make the output voltages of the push-pull inverters in phase; and the voltage reduction module and the voltage conversion module are both connected with the temperature closed-loop control unit, and the output power is adjusted according to the temperature.

[0020] A low-temperature plasma radio frequency surgical method based on the above-mentioned low-temperature plasma radio frequency surgical system, comprising the following steps: S1: After the surgical electrode is connected with the host computer, the electrode recognition module obtains surgical electrode information including the number and structure of working poles and return poles, and sends the information to the main control unit; the information is specifically identified through an ID resistor or an RFID tag in the electrode plug, and the main control unit updates the surgical electrode information library after analyzing the information.

[0021] S2: The main control unit receives input surgical type information, combines the surgical electrode information, and determines the matching electrode working mode through the multi-pole control unit; the surgical type is input through the touch display unit, the main control unit calls a preset mode library, and if it is a new type of surgery, manual configuration is supported and a self-defined mode is saved.

[0022] S3: The radio frequency energy generation circuit is started, the voltage reduction module and the voltage conversion module generate the radio frequency signal, and the multi-pole control unit controls the radio frequency signal output to the surgical electrode according to the determined electrode working mode; when starting, self-checking is first performed, after the self-checking passes, the forward converter outputs 24V direct current, the push-pull inverter is converted into a radio frequency signal, and the target electrode is switched through the relay array.

[0023] S4: The temperature closed-loop control unit collects the tissue temperature in real time, adjusts the output of the radio frequency energy generation circuit after comparing with the target temperature, and maintains the temperature stable; the specific control steps are as follows: S41: The temperature sampling module collects the tissue temperature in the surgical area at a preset frequency to generate a real-time temperature signal; the sampling frequency is 100Hz, and after the high-frequency noise is removed through a low-pass filter, the signal is transmitted to the temperature comparison module.

[0024] S42: The temperature comparison module calculates the deviation value of the real-time temperature and the target temperature, and sends an adjustment instruction to the energy adjustment module if the deviation value exceeds the preset range; the preset range is the target temperature ±3℃, if the real-time temperature is 50℃, ΔT=5℃, the adjustment signal is triggered.

[0025] S43: The energy adjustment module adjusts the voltage reduction amplitude of the voltage reduction module or the radio frequency signal frequency and amplitude of the voltage conversion module according to the instruction, until the temperature deviation returns to the preset range; when ΔT=+5℃, the duty cycle of the forward converter is reduced by 5%, or the frequency of the push-pull inverter is increased by 10kHz, and the energy output is reduced.

[0026] S5: The man-machine interaction module synchronously displays the surgical parameters and step guidance, and receives and executes the user operation instruction; the specific working steps are as follows: S51: The touch display unit displays the current electrode working mode, real-time temperature, radio frequency energy parameters and remaining surgical steps; the remaining steps are displayed through a progress bar and a text prompt, and are automatically updated every time a step is completed.

[0027] S52: If it is detected that the user triggers the mode switching instruction, the main control unit verifies the adaptability of the instruction to the surgical type, switches the mode through the multi-pole control unit if it is adapted, otherwise an error prompt is issued; for example, the user tries to switch to the "single working pole + double loop pole" mode in "nasal turbinate ablation", the main control unit queries the mapping table to confirm the adaptation before executing the switching, otherwise a prompt "the current surgical type does not support this mode" is popped up.

[0028] S6: The maintenance management module monitors the system component state in real time, issues a warning and prompts a processing scheme when an exception occurs; the specific working steps are as follows: S61: The fault detection unit monitors the impedance and temperature parameters of the forward converter, the push-pull inverter and the surgical electrode in real time; current / voltage / temperature data are collected every 500ms and compared with the preset threshold.

[0029] S62: If the parameter exceeds the threshold value, determine that the component is abnormal, and the maintenance management module generates early warning information containing the abnormal position, reason and treatment suggestion, and displays it through the man-machine interaction module; the temperature of the push-pull inverter is detected to be 90 DEG C, which is determined to be "over temperature", the early warning information is "push-pull module over temperature, suggest to suspend use and check the cooling fan", and the radio frequency output function is locked at the same time.

[0030] Preferably, in step S2, the electrode working mode includes at least one of the following: At least two working poles are enabled, and one loop pole is enabled; it is suitable for wide operation area, and the action range is expanded through double working poles, and the current path is concentrated through the loop pole.

[0031] One working pole is enabled, and at least two working poles are used as loop poles; it is suitable for narrow area, single working pole precise positioning, double loop poles disperse backflow current, and the risk of normal tissue heat damage is reduced.

[0032] And when the temperature closed-loop control unit detects that the tissue temperature is out of limit, the main control unit controls the multi-pole control unit to automatically switch to the electrode working mode with less working pole number; the initial mode is "double working pole + single loop pole", and when the temperature is greater than 70 DEG C, it is automatically switched to "single working pole + double loop pole", and the energy density is reduced.

[0033] Compared with the prior art, the low-temperature plasma radio frequency operation system and method provided by the application has the following beneficial effects: The radio frequency energy is adjusted in real time through the temperature closed-loop control unit, the working mode is dynamically switched, the tissue temperature is stabilized, the risk of non-target tissue damage is reduced, precise temperature control is realized, and heat damage is reduced; The man-machine interaction module provides intuitive parameter display and step guidance, supports intelligent instruction verification, reduces operation errors, shortens operation time, simplifies operation, and improves efficiency; The maintenance management module realizes automatic fault detection and life prediction, reduces manual troubleshooting cost, improves system reliability, and reduces maintenance cost; The multi-pole control unit supports multiple electrode working modes, can realize fine operation for complex or narrow operation environment such as otolaryngology and orthopedics, avoid normal tissue damage, and adapt to multiple scenes: The structure combining double forward converters and double push-pull inverters is adopted to share the load and reduce the temperature of the device, so that the energy output is stable, and the energy conversion efficiency and stability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a system block diagram of the low-temperature plasma radio frequency operation system and method.

[0035] Figure 2 This is a flowchart illustrating the steps of a low-temperature plasma radiofrequency surgical system and method according to the present invention. Detailed Implementation

[0036] Please see Figure 1 The present invention provides a low-temperature plasma radiofrequency surgical system, comprising: Surgical electrodes: The surgical electrodes are made of medical-grade stainless steel or titanium alloy, with an insulating coating, such as polyimide, to ensure electrical isolation between the working electrode and the circuit electrode. The specific design is as follows: Working electrodes: 2-4 in number, optional depending on the type of surgery. The ends are needle-shaped with a diameter of 0.5-1.2 mm and a length of 5-15 mm; or blade-shaped with a blade width of 2-5 mm and a blade length of 8-20 mm, used to directly act on the target tissue for cutting or ablation. A temperature sensor, a surface-mount NTC thermistor, model MF58-103F3950, is embedded at the base of the working electrode and is used for real-time acquisition of tissue temperature.

[0037] The number of return electrodes is 1-3, and they are ring-shaped with an inner diameter of 3-8 mm or flat with an area of ​​10-30 mm². They are fixed to the periphery of the working electrode by an insulating bracket to expand the current return path, reduce the local current density, and reduce the risk of thermal damage to normal tissue.

[0038] Connection interface: Uses standardized plugs, such as DIN42802, with an internal integrated ID resistor with an accuracy of ±1%, or RFID tags to store information such as electrode model and number of working / circuit electrodes, for the host to automatically identify electrode configuration.

[0039] Multi-mode classification and application scenarios The system has three preset electrode operating modes, which can be dynamically switched through a multi-electrode control unit: Mode A, dual working electrodes + single loop electrode: suitable for large surgical areas, such as the nasal cavity and pharynx. The dual working electrodes are symmetrically distributed with a spacing of 2-5mm, and the single loop electrode surrounds the outside of the working electrodes to expand the ablation range and improve efficiency.

[0040] Mode B, single working electrode + dual circuit electrode: suitable for narrow areas, such as adenoids and intervertebral foramen. The single working electrode provides precise positioning with the tip ≤1mm from the target tissue. The dual circuit electrodes are placed on both sides of the working electrode with a spacing of 3-6mm to disperse the return current and reduce thermal damage to surrounding tissues.

[0041] Mode C, single working electrode + single circuit electrode: backup mode, used for operations in very small areas, such as minimally invasive retinal surgery, to achieve ultra-precise cutting by minimizing the electrode contact area.

[0042] Host: Radio frequency energy generation circuit: stable and efficient energy output Net power module Input 220V / 50Hz AC power, filtered by EMI filter, model: EPCOS B84111A2222K, to filter out high-frequency interference, then converted to 310V DC through rectifier bridge, model: MB6S. Filter parameter design: differential mode capacitor C1=1μF, common mode inductor L1=10mH, to ensure that the conducted interference meets the EN60601-1 standard.

[0043] Buck module: multiple converter collaborative power supply The buck module converts 310V DC to 24V low-voltage DC for use by low-voltage devices such as the main control unit and human-computer interaction module. It uses dual forward converters, UC3845 control chips, and a parallel structure, with the following specific design: Single forward converter circuit: UC3845 outputs PWM signal, frequency 50kHz, drives MOSFET, model: IRF3205, primary winding N1=100 turns, secondary winding N2=20 turns, rectified through diode, model: Schottky SS34, outputs 24V DC.

[0044] Forward collaborative module: samples the output current of the two converters through current-sharing resistors R1=R2=100Ω, compares the current difference with error amplifier, model: LM358, adjusts the PWM duty cycle of the two converters, error ≤2%, to ensure output voltage consistency, fluctuation ≤±0.5V.

[0045] Voltage conversion module: radio frequency signal generation The voltage conversion module converts 24V DC to a 100kHz-5MHz adjustable radio frequency signal with an amplitude of 0-500Vpp. It uses a dual push-pull inverter, IR2110 driver chip, with the following structure and specific design: Single push-pull inverter circuit: IR2110 drives upper and lower MOSFET, model: IRF540, primary winding N3=50 turns, alternately conducts, secondary winding N4=100 turns, generates sinusoidal radio frequency signal through LC resonant circuit, L2=1μH, C1=10nF.

[0046] Push-pull synchronization module: phase-locked loop circuit, model: CDCE913, synchronizes the switching timing of the two inverters, phase difference ≤5°, adjusts the radio frequency frequency, 100kHz-5MHz, and amplitude, 0-500Vpp, by adjusting the pulse width of the drive signal, PWM duty cycle 0-100%.

[0047] Temperature closed-loop control unit: dynamic adjustment of energy output The temperature closed-loop control unit is the core regulation module of the system, which realizes the temperature stability of ±2℃ through the "sampling-comparison-regulation" closed loop. The specific design is as follows: Temperature sampling module: NTC thermistor, MF58-103F3950, connected to differential amplifier through voltage division circuit, R3=10kΩ, model: AD620, output voltage signal, 0-3.3V corresponds to 0-100℃. The sampling frequency is 100Hz, and the RC low-pass filter is used to eliminate high-frequency noise, R=1kΩ, C=1μF.

[0048] Temperature comparison module: PID controller, model: PID-ControllerTEC2000, set target temperature, such as 50℃, calculate the deviation ΔT between real-time temperature and target. When |ΔT|>3℃, trigger the regulation signal, and the error amplification output is 0-5V.

[0049] Energy regulation module: adjust the output of the voltage conversion module or the voltage conversion module according to the regulation signal. The specific strategy is: When ΔT>0, the temperature is too high: reduce the duty cycle of the forward converter, reduce the pulse width of the PWM signal by 5% / time, or increase the push-pull inverter frequency by 10kHz / time, reduce the RF energy output; When ΔT<0, the temperature is too low: increase the duty cycle of the forward converter, increase the pulse width of the PWM signal by 5% / time, or decrease the push-pull inverter frequency by 10kHz / time, increase the RF energy output; The regulation period is 100ms, which ensures that the temperature fluctuation is ≤±2℃.

[0050] Multi-pole control unit: intelligent electrode mode switching The multi-pole control unit controls the electrode connection path through the relay array, model: G6AK-234P, and the "surgery type-electrode mode" mapping table is stored in EEPROM. The specific work flow is as follows: Electrode identification: after the host is powered on, the electrode information is obtained through the ID resistor of the electrode plug or the RFID reader, the number of working poles and the number of loop poles, and the electrode information database of the host control unit is updated.

[0051] Mode matching: the host control unit receives the surgery type, such as "nasal turbinate ablation" and "adenoidectomy", and inputs it to determine the initial electrode mode, such as "nasal turbinate ablation" default mode A and "adenoidectomy" default mode B.

[0052] Dynamic switching: when the temperature exceeds the limit, such as >70℃, the host control unit triggers the protection logic and switches to the mode with fewer working poles through the multi-pole control unit, such as mode A→mode B, to reduce the energy density.

[0053] Human-computer interaction module: intuitive operation and intelligent guidance The human-computer interaction module adopts a 7-inch capacitive touch screen with a resolution of 800x480. The interface is designed in layers, supports Chinese / English switching, and has the following specific functions: Main interface: real-time display of temperature curve (refresh rate 1 Hz), current electrode mode (text + icon), RF power (0-50 W), frequency (100 kHz-5 MHz), and remaining operation time (estimated according to historical data).

[0054] Sub-interface: Parameter setting page: supports manual adjustment of target temperature, default 50℃, range 30-80℃, power upper limit, default 50W, range 10-100W; Step guidance page: input operation steps before surgery, such as "1. positioning; 2. cutting; 3. ablation", and during operation, fill the progress bar with green and provide text prompts, such as "current step: cutting, remaining time 2 minutes", to guide the operation.

[0055] Intelligent instruction unit: Gesture recognition: supports gestures such as sliding to switch modes, clicking to confirm parameters, and long pressing to implement emergency stop, and analyzes gesture coordinates through a touch screen controller, model: FT5436; Error warning: detects illegal instructions, such as electrode modes not supported by the operation type, pops up a red warning box with the text "mode unavailable", and locks the operation interface for 30 seconds.

[0056] Maintenance management module: reduce operation and maintenance costs The maintenance management module realizes fault warning and life prediction by monitoring the state of components in real time, with the following specific design: Fault detection unit: Power module monitoring: current sensor, model: ACS712-30A, monitors the output current of the forward converter / push-pull inverter, voltage sensor, model: HV2500, monitors the RF output voltage; when the current > 8A or the voltage < 400V for 3 seconds, it is determined that the "power module is overloaded", triggering a warning, and the interface prompts "power module overload, please check the load".

[0057] Electrode state monitoring: determines the contact state by the resistance value of the NTC thermistor at the root of the working electrode, normal resistance 10kΩ±1%, impedance > 2000Ω is determined as "electrode not in contact with tissue", the interface prompts "electrode not in contact, please adjust the position".

[0058] Life prediction unit: Data collection: records the cumulative working time of each component, counts through the clock chip of the main control unit, and performance parameters such as forward converter efficiency and push-pull inverter output amplitude decay rate; Modeling: Based on the accelerated aging test data, the life model is established: forward converter life = 2000 hours x (1-efficiency attenuation rate) 2 When the cumulative length reaches 2000 hours or the efficiency attenuation is greater than 10%, the interface pops up a "suggest replacing the voltage reduction module" prompt and records it to the local storage EEPROM.

[0059] Please refer to Figure 2 A low-temperature plasma radio frequency surgical method, comprising the following steps: S1: electrode connection and recognition with host Insert the surgical electrode into the host interface. The ID resistor in the electrode plug or the RFID tag sends an identification signal to the host, such as a resistance value of 10kΩ corresponding to model A and 20kΩ corresponding to model B. The host control unit samples the resistance value through ADC with a precision of 12 bits, analyzes the electrode information from EEPROM, and updates the electrode information library with the number of working poles and the number of loop poles.

[0060] S2: surgical type input and mode matching The medical staff selects the surgical type through the "surgical type" menu of the touch display unit, such as "nasal turbinate ablation". The host control unit calls the preset mode library stored in the Flash and matches the corresponding electrode working mode, such as the default mode A: double working poles + single loop pole for "nasal turbinate ablation". If it is a new type of surgery that is not preset, manual configuration is supported, the number of working poles / loop poles is selected, and it is saved as a custom mode.

[0061] S3: system self-check and energy start Self-check process: the host control unit sends a "self-check" instruction to the multi-pole control unit, which closes the relay array in turn, detects the impedance of each electrode path, and the normal value is ≤50Ω; at the same time, the radio frequency energy generation circuit performs "no-load test", the output power is 10W, and the duration is 1 second, verifying that the forward converter and push-pull inverter are working normally without overcurrent / overvoltage alarm.

[0062] Energy start: after the self-check passes, the host control unit sends a "start" instruction, the voltage reduction module outputs 24V DC, the voltage conversion module starts working, the push-pull inverter generates a radio frequency signal with an initial frequency of 2MHz and an amplitude of 100Vpp, and the multi-pole control unit outputs the radio frequency signal to the double working poles and single loop pole according to the initial mode, mode A.

[0063] S4: temperature closed-loop control and dynamic adjustment Temperature sampling: the temperature sampling module collects the voltage signal of the NTC thermistor at the root of the working pole at a frequency of 100Hz, transmits it to the host control unit after differential amplification, and the resolution is 0.1℃.

[0064] Temperature comparison and adjustment: the master control unit compares the real-time temperature 55℃ with the target temperature 50℃, calculates ΔT = +5℃, which exceeds the threshold value 3℃, triggering the temperature adjustment module. The adjustment module calculates the adjustment amount by the PID algorithm, ΔT x 0.5 = 2.5, outputs the PWM signal to adjust the duty cycle of the forward converter, the original duty cycle 30% is reduced to 27.5%, the radio frequency power is reduced from 30W to 25W, so that the temperature falls to 52℃ within 10 seconds, and finally stabilizes at 50±2℃.

[0065] S5: human-computer interaction and operation execution Parameter display: the touch display unit main interface updates the temperature curve in real time: smoothing filter processing, current mode: "mode A: double working pole + single loop pole", power: 25W, frequency: 2MHz, and remaining steps: "cutting is completed, entering the ablation stage".

[0066] Mode switching: if the ablation range needs to be expanded during the operation, such as from the nasal turbinates to the nasal septum, the medical staff switches to mode A through a sliding gesture, double working pole + single loop pole, the master control unit verifies the mode and the type of operation, "nasal turbinates ablation", after adaptation, switches the relay through the multi-pole control unit, enables another group of working poles, and the interface prompts "mode switching success, current mode: double working pole + single loop pole".

[0067] S6: maintenance management and fault handling Real-time monitoring: the maintenance management module collects power module current every 500ms: forward converter current 5A, voltage: radio frequency output voltage 450V, and electrode impedance: 15kΩ, all within the normal range, current ≤8A, voltage ≥400V, impedance ≤2000Ω.

[0068] Fault warning: if the temperature of the push-pull inverter rises to 90℃ due to poor heat dissipation, the threshold value is 85℃, the fault detection unit triggers a warning, the interface pops up "push-pull module over temperature, suggest to pause using and check the cooling fan", at the same time, the radio frequency output function is locked, the power is reduced to 0W, until the temperature drops below 80℃.

[0069] The system performance verification of the low-temperature plasma radio frequency operation system and method in the adenoidectomy in the department of otolaryngology is as follows: Precise temperature control: the target temperature during the operation is set to 60℃, the actual temperature fluctuation range is 58-62℃, ≤±2℃, and there is no non-target tissue such as the epitympanic cushion, heat damage, and postoperative patient pain score is reduced.

[0070] Operation simplification: through the step guidance of the human-computer interaction interface, the operation time is shortened from 45 minutes of the traditional method to 30 minutes, and the parameter adjustment error rate of the medical staff is reduced.

[0071] Maintenance cost: The maintenance management module gives a 1-week early warning that the "positive convection transformer life remaining 10%", and timely replacement of parts to avoid intraoperative failure downtime, and annual maintenance cost reduction.

[0072] Multi-scene adaptation: In orthopedic minimally invasive surgery, such as intervertebral disc ablation, switch to mode B, single working pole + double circuit pole, electrode tip precise positioning, double circuit pole disperses current, surrounding nerve tissue temperature is not easy to rise, and the success rate of operation is improved.

[0073] The present application solves the problems of unstable temperature control, complex operation, high maintenance cost and poor scene adaptability of traditional low temperature plasma radiofrequency surgical system by four core technologies of multi-pole adjustable electrode, temperature closed loop control, intelligent man-machine interaction and predictive maintenance, realizes precise temperature control, simplified operation: step guide + error warning, low maintenance cost: predictive maintenance, and multi-scene adaptation: flexible switching in wide / narrow area, significantly improves the safety and efficiency of operation, and has wide clinical application prospect.

[0074] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0075] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A low-temperature plasma radiofrequency surgical system, comprising surgical electrodes and a main unit, wherein the main unit integrates a radiofrequency ablation power supply, characterized in that: The surgical electrode includes at least two working electrodes and at least one return electrode; The radiofrequency ablation power supply includes: The main control unit is used to output control signals during the system's operation. The radio frequency energy generation circuit includes a mains power supply module, a step-down module, and a voltage conversion module connected in sequence. The step-down module is used to step down a DC signal to a target low-voltage DC signal, and the voltage conversion module is used to convert the target low-voltage DC signal into a radio frequency signal. A multi-pole control unit is electrically connected to the main control unit, voltage conversion module and surgical electrode respectively. It is used to determine the electrode working mode according to the surgical type information and surgical electrode information, and control the radio frequency signal to be output to the surgical electrode according to the mode. The electrode working mode indicates the selective activation of the working pole and the loop pole. A temperature closed-loop control unit is connected to the main control unit, the radio frequency energy generation circuit and the surgical electrode, and is used to detect tissue temperature in real time and adjust the radio frequency energy output to maintain temperature stability. The human-computer interaction module, connected to the main control unit, is used to display surgical parameters and receive operation instructions, simplifying the operation process; The maintenance management module is connected to the main control unit and the radio frequency energy generation circuit, and is used to monitor the component status and reduce maintenance costs.

2. The system of claim 1, wherein: The temperature closed-loop control unit includes: Temperature sampling module is used to collect real-time tissue temperature in the surgical area; The temperature comparison module is used to calculate the difference between the real-time temperature and the preset target temperature; An energy regulation module is connected to the radio frequency energy generation circuit and adjusts the output parameters of the step-down module or voltage conversion module according to the difference result to dynamically adjust the radio frequency energy.

3. The system of claim 1, wherein: The human-computer interaction module includes: The touch display unit is used to display real-time temperature, electrode working mode, radio frequency energy parameters, and surgical procedure guidance information; The intelligent instruction unit is used to receive user input commands for mode switching and parameter adjustment, and feed them back to the main control unit for execution. It also has an operation error warning function.

4. The system of claim 1, wherein: The maintenance management module includes: The fault detection unit is used to monitor the operating status of the step-down module, voltage conversion module and surgical electrode in real time and generate fault diagnosis information. The life prediction unit predicts the replacement cycle of vulnerable parts and issues reminders based on the cumulative operating time and performance degradation data of the components.

5. The system of claim 1, wherein: The buck module includes at least two forward converters and a forward coordination module, the forward coordination module being used to ensure that the output voltages of the forward converters are consistent; the voltage conversion module includes at least two push-pull inverters and a push-pull synchronization module, the push-pull synchronization module being used to ensure that the output voltages of the push-pull inverters are in phase; and both the buck module and the voltage conversion module are connected to the temperature closed-loop control unit to adjust the output power according to the temperature.

6. A method of cryosurgery using a cryosurgical radiofrequency system according to any one of claims 1 to 5, characterized in that Includes the following steps: S1: After the surgical electrode is connected to the host, the electrode identification module obtains the surgical electrode information, including the number and structure of the working electrode and the circuit electrode, and sends it to the main control unit; S2: The main control unit receives the input surgical type information, combines the surgical electrode information, and determines the matching electrode operation mode through the multipole control unit; S3: The radio frequency energy generation circuit is started, the voltage reduction module and the voltage conversion module generate the radio frequency signal, and the multipole control unit controls the radio frequency signal output to the surgical electrode according to the determined electrode operation mode; S4: The temperature closed-loop control unit collects the tissue temperature in real time, adjusts the output of the radio frequency energy generation circuit after comparing with the target temperature, and maintains the temperature stable; S5: The man-machine interaction module synchronously displays the surgical parameters and step guidance, receives and executes the user operation instructions; S6: The maintenance management module monitors the system component state in real time, issues a warning and prompts the processing scheme when an exception occurs.

7. A cryosurgical RF method according to claim 6, wherein: In step S4, the control steps of the temperature closed-loop control unit include: S41: The temperature sampling module collects the tissue temperature of the surgical area at a preset frequency to generate a real-time temperature signal; S42: The temperature comparison module calculates the deviation value of the real-time temperature and the target temperature, and sends an adjustment instruction to the energy adjustment module if the deviation value exceeds the preset range; S43: The energy adjustment module adjusts the voltage reduction amplitude of the voltage reduction module or the radio frequency signal frequency and amplitude of the voltage conversion module according to the instruction until the temperature deviation returns to the preset range.

8. The method of claim 6, wherein the temperature of the plasma is in the range of 20 to 40 degrees Celsius. In step S5, the working steps of the man-machine interaction module include: S51: The touch display unit displays the current electrode operation mode, real-time temperature, radio frequency energy parameters and remaining surgical steps; S52: If the user triggers the mode switching instruction is detected, the main control unit verifies the adaptability of the instruction to the surgical type, and switches the mode through the multipole control unit if it is adapted, otherwise an error prompt is issued.

9. The method of claim 6 wherein: In step S6, the working steps of the maintenance management module include: S61: The fault detection unit monitors the impedance and temperature parameters of the forward converter, push-pull inverter and surgical electrode in real time; S62: If the parameters exceed the threshold, it is determined that the component is abnormal, the maintenance management module generates warning information containing the abnormal position, reason and processing suggestion, and displays it through the man-machine interaction module.

10. The method of claim 6, wherein: In step S2, the electrode operation mode includes at least one of the following: At least two working poles are enabled, and one loop pole is enabled; One working pole is enabled, and at least two working poles are enabled as loop poles; And when the temperature closed-loop control unit detects that the tissue temperature is out of limit, the main control unit controls the multipole control unit to automatically switch to the electrode operation mode with fewer working poles.

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