CN117045342A - Frequency modulation low temperature plasma scalpel control system and equipment thereof - Google Patents
Frequency modulation low temperature plasma scalpel control system and equipment thereof Download PDFInfo
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
- A61B2018/00583—Coblation, i.e. ablation using a cold plasma
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00607—Coagulation and cutting with the same instrument
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00696—Controlled or regulated parameters
- A61B2018/00732—Frequency
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- A—HUMAN NECESSITIES
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00696—Controlled or regulated parameters
- A61B2018/00767—Voltage
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
- A61B2018/122—Generators therefor ionizing, with corona
Abstract
The invention discloses a frequency-modulation low-temperature plasma scalpel control system and equipment thereof. In the invention, the following components are added: the EMC and rectification filter module carries out filtering and rectification treatment on an alternating current input power supply and then transmits the alternating current input power supply to the isolation voltage reduction module, and the isolation voltage reduction module carries out voltage reduction on direct current and then transmits the direct current to the frequency modulation voltage boosting power output module to carry out frequency modulation voltage boosting treatment; the frequency modulation boosting power output module outputs the frequency modulation boosted high-frequency electric energy to the operation electrode structure body; the programmable power output control unit controls the isolation buck module to start and stop outputting low-voltage direct current and simulate the phase-shifting full-bridge switch time sequence to output a switch signal according to the control instruction of the main control unit, and controls the frequency modulation boost power output module to output set frequency and voltage to the operation electrode. According to the invention, the alternating current is converted and frequency modulated by arranging the isolation buck module and the frequency modulation boost power output module, and the output control of the power circuit is realized by matching the main control unit and the programmable power output control unit.
Description
Technical Field
The invention belongs to the technical field of medical equipment, and particularly relates to a frequency-modulation low-temperature plasma scalpel control system and equipment thereof.
Background
The surgical operation is the most main means of surgical disease treatment, surgical instrument selection has important influences on the effect of the surgical operation, postoperative recovery and the like, scientific research and clinical staff continuously develop and innovate novel surgical equipment, surgical instruments develop novel surgical equipment such as high-frequency electrotomes, ultrasonic blades, cold blades, plasmas and the like from traditional surgical knives, and compared with traditional mechanical surgical knives, the surgical operation device is more convenient to use and better in effect, and doctors can select appropriate surgical equipment according to different surgical scene needs. The high-frequency electric knife is the most widely used electrosurgical equipment in clinic due to the excellent performance of the high-frequency electric knife in cutting speed, hemostatic effect and the like, but the high-frequency electric knife is easy to cause tissue burn or scab in operation, thereby influencing recovery, and patients feel intense after operation, and the main reasons are that the working principle of the high-frequency electric knife is that the high-frequency electric knife heats the tissue when the high-frequency high-voltage current generated by the electrode tip contacts with a body, so that cells burst or vaporize, cutting and coagulation of the body tissue are realized, the effective working temperature is high, generally above 100 ℃, and the heat damage outside the operation purpose is difficult to avoid in the operation process due to the high temperature of the operation action part.
With the deep research of the low-temperature plasma technology in the academy, the low-temperature plasma technology is widely applied in surgical operation, 0.9% of physiological saline is needed to be injected between operation electrodes when the low-temperature plasma operation equipment works, and alternating high-frequency electric fields are generated between the two electrodes of the operation electrodes to excite ions (Na+) in the physiological saline to form a plasma thin layer with the thickness of 100um at the front end of the cutter head, and the molecular bonds of tissue cells can be easily broken by the energy of the particles, so that the cells are cracked into simple carbohydrate and oxide (vaporization), and the low-temperature cutting and coagulation of the tissues are realized. Because the low-temperature plasma operation system can complete the functions of tissue cutting hemostasis, tissue ablation, shrinkage and the like at the temperature of 40-70 ℃, compared with a high-frequency electrotome, the thermal injury can be greatly reduced. The low-temperature plasma operation has excellent performance in terms of operation bleeding amount, operation time, pain, postoperative recovery and the like, so that the low-temperature plasma operation is widely applied to the fields of ear-nose-throat operation, gynaecology, urinary tract, orthopaedics and the like.
Because of limitations of power technology and device characteristics, current high-frequency surgical equipment (high-frequency electrotome, low-temperature plasma, etc.) all adopt single fixed output frequency, such as 100KHz square wave, 450KHz sine wave, etc. Because of the special action mechanism, when the low-temperature plasma operation equipment outputs in a 100KHz square wave form, the rising edge/falling edge time of the square wave is short, when the operation is in a cutting mode, the heat generated by the cutter head is smaller, more energy is converted into charged ion cutting energy, the working temperature of the cutter head part is lower, the thermal damage to the operation part is smaller, but due to the low working frequency, the low-frequency current nerve stimulation is extremely easy to be caused during operation of some parts, such as the spinal nerve reflection (the pain of a patient is severe) during the operation of an intervertebral foraminiferous mirror, and the obturator nerve reflection (the tic of the patient) is induced during the urinary operation. Such procedures require plasma surgical equipment to be operated at higher frequencies to avoid inducing nerve stimulation. When the low-temperature plasma operation equipment works at a higher output frequency (such as 450 KHz), the output power of the plasma equipment can be converted into more heat, so that the temperature of the cutter head part is higher, and the low-temperature plasma operation equipment is not suitable for operations requiring lower cutting temperature such as ear, nose and throat. In order to solve the problem, a manufacturer assembles a set of low-frequency (100 KHz square wave) switching power supply circuit and a set of high-frequency (450 KHz sine wave) switching power supply into a set of equipment, and when the equipment is operated, an operator selects the equipment according to the needs, and the equipment is switched through a relay. However, the implementation method can only provide two fixed working frequency choices for operators, the manufacturing cost is obviously higher, and clinicians cannot be supported to study the cutting and coagulation effect differences of various frequencies of the low-temperature plasma operation equipment so as to improve the level of operation and clinical scientific research.
Patent publication number CN109009416B discloses a low temperature plasma strip knife surgical device comprising: a liquid input unit for inputting liquid to the target in response to the liquid input signal so as to form a thin layer of conductive medium between the emitter electrode and the return electrode; the bipolar electrode socket joint is connected with the high-frequency generator through a high-frequency connecting wire and is used for receiving a first input voltage generated by the high-frequency generator; the plasma generating device comprises a transmitting electrode, a loop electrode and a conducting loop, wherein the transmitting electrode receives a first input voltage generated by a high-frequency generator through a bipolar electrode socket joint, the first voltage is applied between the transmitting electrode and the loop electrode, so that a conducting medium reaches a first temperature and is caused to be converted into a plasma layer, the conducting medium is excited by electric energy to generate plasma, the target body is vaporized and stripped based on radio-frequency energy of the plasma, and the loop electrode and the transmitting electrode are led in through the same conduit and form a conducting loop in the target body.
The surgical device proposed by the above patent still can only output a fixed operating frequency; in order to solve the problems, a frequency-modulation low-temperature plasma scalpel control system and equipment thereof are designed.
Disclosure of Invention
The invention aims to provide a frequency-modulation low-temperature plasma scalpel control system and equipment thereof, which are used for converting and modulating alternating current by arranging an isolation voltage-reduction module and a frequency-modulation voltage-boosting power output module, realizing output control of a power circuit by matching a main control unit and a programmable power output control unit, adjusting the voltage frequency output by the power circuit and solving the problem of adjusting the output frequency of a surgical electrode.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a control system of a frequency-modulated low-temperature plasma scalpel, which comprises a power output module for outputting working voltage to an operation electrode structure body, wherein the power output module is formed by sequentially connecting an EMC and rectifying filter module, an isolation depressurization module, a frequency-modulated boosting power output module and an electrode connection identification circuit;
the control module is used for controlling the power output module and comprises a main control unit, a programmable power output control unit and a foot switch; the main control unit acquires parameter data of the operation electrode structure body through data of the reading electrode connection identification circuit; the main control unit outputs a control instruction to the programmable power output control unit;
the programmable power output control unit is electrically connected with the isolation buck module and the frequency modulation boost power output module; the programmable power output control unit controls the isolation buck module to start and stop outputting low-voltage direct current and simulate phase-shifting full-bridge switch time sequence outputting switch signals according to the control instruction of the main control unit, and controls the frequency modulation boost power output module to output set frequency and voltage to the operation electrode.
Preferably, the EMC and rectifying and filtering module performs filtering and rectifying treatment on an ac input power supply and then transmits the ac input power supply to the isolation buck module, and the isolation buck module performs buck on the dc and then transmits the dc to the frequency modulation boost power output module for frequency modulation boost treatment; the frequency modulation boost power output module outputs the frequency modulation boosted high-frequency alternating current energy to the operation electrode structure body.
Preferably, the electrode connection identification circuit reads parameter data of the surgical electrode structure; the electrode connection identification circuit is an information read-write memory circuit, and the electrode connection identification circuit reads data information in a memory chip arranged on the surgical electrode structure body to obtain the type, power gear and working frequency data of the surgical electrode and transmits the data to the main control unit.
Preferably, the main control unit and the programmable power output control unit are subjected to signal isolation through an isolation module, and the isolation module adopts a photoelectric isolation module.
Preferably, the main control unit is respectively and electrically connected with the parameter setting and displaying module and the foot switch, the foot switch outputs a switch signal to the main control unit, and the main control unit controls the start and stop of the operation electrode according to the switch signal; the parameter setting and displaying module adopts a touch display screen, and inputs and displays the working mode, gear and output frequency data of the operation electrode to the main control unit.
Preferably, the main control unit is further electrically connected with a liquid flow control module, and the main control unit outputs a control instruction to the liquid flow control module; the liquid flow control module controls the on-off of a switch of the normal saline supply device according to the control instruction.
Preferably, the power supply further comprises a switch power supply module 1 and a switch power supply module 2, wherein the input ends of the switch power supply module 1 and the switch power supply module 2 are connected with an alternating current input power supply; the switch power supply module 1 is used for supplying power to the programmable power output control module, and the switch power supply module 2 is used for supplying power to the liquid flow control module, the main control unit and the parameter setting and display module.
A frequency-modulation low-temperature plasma surgical device is applied with the frequency-modulation low-temperature plasma surgical knife control system.
The invention has the following beneficial effects:
1. according to the invention, the isolation buck module and the frequency modulation boost power output module are arranged to convert and modulate alternating current, and the main control unit and the programmable power output control unit are matched to realize output control of the power circuit, so that the voltage frequency output by the power circuit can be adjusted.
2. The invention can realize the selection output working frequency between 100KHz and 500KHz, help clinical scientific researchers to carry out experimental study on the influence of the working frequency on the cutting and coagulation effects in the application of low-temperature plasma surgery, and promote the clinical scientific research level and the surgical effect.
3. The invention can select proper frequency to achieve the operation effect and avoid the low-frequency nerve stimulation in the operation.
4. The invention has faster output power response by simulating the phase-shifting full-bridge soft start output process.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system block diagram of a frequency modulated low temperature plasma scalpel control system of the present invention.
FIG. 2 is a circuit diagram of a frequency modulated boost power output module;
FIG. 3 is a timing diagram of the phase-shifting full-bridge drive control chip at start-up.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention is a control system for a frequency-modulated low-temperature plasma surgical knife, comprising a power output module for outputting a working voltage to a surgical electrode structure and a control module for controlling the power output module;
the power output module is formed by sequentially connecting an EMC (electro magnetic compatibility) rectifying and filtering module, an isolation voltage reduction module, a frequency modulation voltage boosting power output module and an electrode connection identification circuit; the electrode connection identification circuit reads parameter data of the surgical electrode structure body, the electrode connection identification circuit is an information read-write memory circuit, the memory chip is arranged on the surgical electrode structure body, the electrode connection identification circuit is connected with the surgical electrode structure body through a connector interface, the main control unit reads and writes memory data of the memory chip at regular time to judge whether the surgical electrode is correctly accessed or not, the type of the surgical electrode is judged according to the memory data of the memory chip, and the main control unit displays recommended power gear and working frequency through the parameter setting and display module according to the identified surgical electrode type;
the EMC and rectifying and filtering module converts the external alternating current input power supply after rectifying and filtering treatment into high-voltage direct current and outputs the high-voltage direct current to the isolation voltage reduction module, so that high-voltage direct current power supply is provided for the isolation voltage reduction module, conduction interference in a circuit is reduced, noise signal interference from the outside is restrained and attenuated, and meanwhile interference of equipment to the outside is restrained and attenuated; the isolation voltage reduction module is controlled by the programmable power output control unit to convert the input direct-current high-voltage power into direct-current low-voltage power; the isolated voltage reduction module is a phase-shifting full-bridge switching power supply circuit taking a phase-shifting full-bridge special chip UC3879 as a core, and the phase-shifting full-bridge switching power supply circuit receives a digital-to-analog conversion output voltage signal and a start-stop control signal which are output by the programmable power output control unit and respectively controls the output voltage and the start-up or stop working state of the isolated voltage reduction module; the isolation buck module realizes secondary output voltage closed-loop control in an isolation feedback mode, completes isolation conversion of the DCDC switching power supply, outputs stable direct current voltage, outputs low-voltage direct current output by the isolation buck module to the frequency modulation boost power output module, and provides a working power supply for the frequency modulation boost power output module; the frequency modulation boosting power output module outputs the frequency modulation boosted high-frequency alternating current energy to the operation electrode structure;
the control module comprises a main control unit, a programmable power output control unit and a foot switch; the main control unit is a processor unit with built-in embedded software taking a 32-bit singlechip as a core; the main control unit acquires parameter data of the operation electrode structure body through data of the reading electrode connection identification circuit; the main control unit outputs a control instruction to the programmable power output control unit; the main control unit and the programmable power output control unit are subjected to signal isolation through an isolation module, wherein the isolation module adopts a photoelectric isolation module which is an optical coupler;
the main control unit is respectively connected with the parameter setting and displaying module and the foot switch, and the parameter setting and displaying module and the foot switch are used as input equipment to realize the input of control signals; the foot switch is divided into two pedals for cutting and coagulating, the cutting and coagulating modes are respectively controlled, the foot switch outputs a switch signal to the main control unit, and an operator can start and stop the high-frequency power output of the equipment by operating the foot switch; the parameter setting and displaying module adopts a touch display screen, and inputs and displays the working mode, gear and output frequency data of the operation electrode to the main control unit; an operator can set a working mode, a gear and an output frequency through a touch operation and display function, and the main control unit transmits the set working mode, gear and output frequency parameters to the programmable power output control unit;
the programmable power output control unit is electrically connected with the isolation buck module and the frequency modulation boost power output module, and controls the isolation buck module to start and stop outputting low-voltage direct current and simulate the phase-shifting full-bridge switch time sequence to output a switch signal according to a control instruction of the main control unit; the programmable power output control unit is a processor unit with high-speed DSP as a core and built-in embedded software, has high-speed timer, AD and DA conversion functions and high-speed operation capacity, combines the timer function and software algorithm operation, and has high-frequency simulation phase-shifting full-bridge time sequence output and switching current abnormality detection capacity; the programmable power output control unit outputs an analog phase-shifting full-bridge time sequence output driving signal to control the frequency modulation boost power output control module to convert low-voltage direct current into alternating high-voltage square wave output, and the working state of the frequency modulation boost power output module is controlled by sampling real-time parameters such as primary side voltage, primary side current, output current and the like.
The control module further comprises a switch power supply module 1 and a switch power supply module 2, wherein the input ends of the switch power supply module 1 and the switch power supply module 2 are connected with an alternating current input power supply; the switching power supply module 1 is used for supplying power to the programmable power output control module, and the switching power supply module 2 is used for supplying power to the liquid flow control module, the main control unit and the parameter setting and display module.
The main control unit is also electrically connected with the liquid flow control module and outputs a control instruction to the liquid flow control module; the liquid flow control module controls the on-off of a switch of the normal saline supply device according to the control instruction, and the main control unit controls the liquid flow control module to synchronously output or close with the high-frequency power output function.
Embodiment one:
as shown in fig. 2, the circuit diagram of the fm boost power output module and the programmable power output control unit is shown, where the fm boost power output module includes full-bridge switching tubes Q1-Q4, an isolation transformer T1, dc blocking capacitors C10, C12, C13, an output current coupling sampling module, a primary side current coupling sampling module, half-bridge drivers U1, U2, a primary voltage measurement sampling circuit, a switching current comparator circuit, and the like.
The phase-shifting full-bridge A arm drive, B arm drive, C arm drive and D arm drive signal input ends of the half-bridge drivers U1 and U2 are respectively connected with the analog phase-shifting full-bridge drive output ports of the programmable power output control unit, and the bridge arm drive output ends are respectively connected with the grid electrodes of the full-bridge switching tubes Q1 to Q4 after passing through the current limiting resistor; the full-bridge switching tubes Q1-Q4, the bias capacitor C10 and the isolation transformer T1 form a full-bridge switching circuit, and the secondary of the isolation transformer is connected with the blocking capacitors C12 and C13 and the differential mode inductor L1.
The primary side voltage sampling end of the primary side voltage sampling circuit, the primary side current sampling end of the primary side current coupling sampling module and the output current sampling end of the output current coupling sampling module are respectively connected with an analog-to-digital conversion input port of the programmable power output control unit; the over-current comparison reference voltage port of the primary side over-current comparison circuit is connected with the digital-to-analog conversion output port of the programmable power output control unit, and the programmable power output control unit outputs the over-current comparison reference voltage to the reference voltage port of the comparator of the primary side over-current comparison circuit through the digital-to-analog conversion output port to serve as an over-current voltage comparison reference; the primary side current sampling end of the primary side current coupling sampling module is connected with the input port of the comparator of the primary side overcurrent comparison circuit and is used as an input signal of overcurrent comparison; the output port of the comparator of the primary side overcurrent comparison circuit is connected with the signal input interruption port of the programmable power output control unit, and is used as a primary side overcurrent fault state instant response signal of the programmable power output control unit.
The primary side current coupling sampling module comprises a coupling transformer T2, high-frequency diodes D3-D6, a voltage follower circuit taking U3A as a core and the like, wherein the coupling transformer T2 samples primary side switching current in an isolation mode, the high-frequency diodes D3-D6 form a high-frequency rectifying circuit to rectify the primary side switching current sampled by the coupling transformer T2 into unidirectional voltage, and the voltage follower taking U3A as the core enhances the coupling current conversion voltage after voltage division adjustment into an input signal which can be used for AD sampling conversion of the programmable power output control unit; the output current coupling sampling module and the primary side current coupling sampling module have the same circuit structure; the programmable power output control unit acquires primary side switching current and output current data of the phase-shifting full-bridge switching circuit through AD conversion and is used as a basis for calculating output impedance and adjusting output power.
The half-bridge drivers U1 and U2 are high-power GaN transistor drivers LM5113, have independent high-side and low-side input and output, have the switching frequency of more than 2MHz at most, and can realize the switching of tens of kilohertz to one megahertz by driving the high-frequency GaN transistors; the full-bridge switching transistors Q1 to Q4 are novel high-frequency GaN transistors, and have excellent high-frequency switching characteristics compared with conventional silicon transistors.
The programmable power output control unit collects primary side voltage, primary side switching current and output current of the phase-shifting full-bridge switching circuit in real time, and substitutes the primary side voltage and the primary side switching current into the power calculation formula P=U×I to calculate output power;
the output impedance can be calculated by substituting the output power and the output current according to the formula zr=p/(i×i). The programmable power output control unit compares the calculated output power with the power corresponding to the current working mode and the power gear, and when the calculated output power exceeds the set power, the programmable power output control unit outputs a voltage regulating signal to the isolation voltage reduction module to reduce the output voltage of the isolation voltage reduction module or outputs an effective value of the analog phase-shifting full-bridge driving signal to reduce the output power in an intermittent mode; when the programmable power output control unit is lower than the normal working impedance of the corresponding working mode, the programmable power output control unit judges that the output impedance is abnormal, and stops or intermittently outputs the analog phase-shifting full-bridge driving signal according to the value of the output impedance so as to protect the circuit to safely work or reduce the invalid power output and reduce the heat loss.
Embodiment two:
the isolated voltage reduction module adopts a typical phase-shifting full-bridge drive control chip such as UC3879, in order to prevent the output end from being excessively small or short-circuited, soft start is generally arranged when the switch circuit is started, the switching time of a bridge arm is gradually increased until the bridge arm is normal (as shown in fig. 3), the switch tube is prevented from being damaged due to overcurrent, the characteristic is obviously advantageous for a common switch power capacitive load circuit, the switch tube is prevented from being damaged due to overlarge current in cold start, but a drive circuit for the low-temperature plasma operation equipment is defective, because the capacitor is not required to be charged as a common high-power switch power supply when the power output end of the low-temperature plasma operation equipment is normally used, and the fast full-power output is further required to respond to the using target of an operator so as to reduce the heat loss in the soft start process.
Embodiment III:
the programmable power output control unit in the embodiment is a processor unit with a high-speed DSP as a core and built-in embedded software, is internally provided with a high-speed AD, can sample primary side switching current and output current at a frequency of 10MHz, and simultaneously processes an overcurrent signal in an interrupt input mode, so that the time sequence driving output of a special phase-shifting full-bridge control chip can be realized, the switch overcurrent real-time protection function can be realized, the calculation of output power and output impedance can be completed, the output power adjustment completion output can be realized according to the output power and the output impedance, and the unnecessary output heat loss can be reduced.
The programmable power output control unit simulates the control time sequence of four bridge arms of the phase-shifting full bridge in a timer and software time delay mode, starts output with minimum width when starting power output, judges whether circuit abnormality exists or impedance of an output load end through AD conversion, immediately closes output to protect a switching circuit if switching current is overlarge, and immediately starts full power output when switching current is normal. When the simulation phase-shifting full-output work, primary side voltage, switching current and output current are acquired through AD conversion in the bridge arm conduction process, output power and output impedance are calculated, software can dynamically compare the output power, the magnitude of the output impedance and preset power gear comparison, power output is timely adjusted, each mode is guaranteed to work in a reasonable output power interval, for example, when the simulation phase-shifting full-output work is performed in a cutting mode, the output impedance after plasma excitation is more than 200Ω, if the simulation phase-shifting full-output work is lower than 200 ohms, intermittent output is started to reduce heat loss, and the operation electrode is started after being correctly operated by an operator.
Embodiment four:
the embodiment is a frequency-modulated low-temperature plasma surgical device, and the frequency-modulated low-temperature plasma surgical knife control system is applied.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
In addition, it will be understood by those skilled in the art that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium, such as a ROM/RAM, a magnetic disk or an optical disk, etc.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (8)
1. A control system of a frequency-modulated low-temperature plasma scalpel is characterized by comprising
The power output module is used for outputting working voltage to the operation electrode structure body and is formed by sequentially connecting an EMC and rectifying and filtering module, an isolation buck module, a frequency modulation boost power output module and an electrode connection identification circuit;
the control module is used for controlling the power output module and comprises a main control unit, a programmable power output control unit and a foot switch; the main control unit acquires parameter data of the operation electrode structure body through data of the reading electrode connection identification circuit; the main control unit outputs a control instruction to the programmable power output control unit;
the programmable power output control unit is electrically connected with the isolation buck module and the frequency modulation boost power output module; the programmable power output control unit controls the isolation buck module to start and stop outputting low-voltage direct current and simulate phase-shifting full-bridge switch time sequence outputting switch signals according to the control instruction of the main control unit, and controls the frequency modulation boost power output module to output set frequency and voltage to the operation electrode.
2. The control system of the frequency-modulated low-temperature plasma scalpel according to claim 1, wherein the EMC and rectifying and filtering module performs filtering and rectifying treatment on an ac input power supply and then transmits the ac input power supply to the isolated buck module, and the isolated buck module performs frequency-modulated boost treatment on the dc power and then transmits the dc power to the frequency-modulated boost power output module; the frequency modulation boost power output module outputs the frequency modulation boosted high-frequency alternating current energy to the operation electrode structure body.
3. The fm low temperature plasma scalpel control system of claim 2, wherein said electrode connection identification circuit reads parameter data of a surgical electrode structure; the electrode connection identification circuit is an information read-write memory circuit, and the electrode connection identification circuit reads data information in a memory chip arranged on the surgical electrode structure body to obtain the type, power gear and working frequency data of the surgical electrode and transmits the data to the main control unit.
4. The control system of the frequency-modulated low-temperature plasma surgical knife according to claim 1, wherein signal isolation is performed between the main control unit and the programmable power output control unit through an isolation module, and the isolation module adopts a photoelectric isolation module.
5. The control system of the frequency-modulated low-temperature plasma scalpel according to claim 1, wherein the main control unit is electrically connected with the parameter setting and displaying module and the foot switch respectively, the foot switch outputs a switch signal to the main control unit, and the main control unit controls the start and stop of the operation electrode according to the switch signal; the parameter setting and displaying module adopts a touch display screen, and inputs and displays the working mode, gear and output frequency data of the operation electrode to the main control unit.
6. The control system of a frequency modulated low temperature plasma surgical knife according to claim 5, wherein the main control unit is further electrically connected to a flow control module, and the main control unit outputs control instructions to the flow control module; the liquid flow control module controls the on-off of a switch of the normal saline supply device according to the control instruction.
7. The control system of the frequency-modulated low-temperature plasma surgical knife according to claim 6, further comprising a switch power supply module 1 and a switch power supply module 2, wherein the input ends of the switch power supply module 1 and the switch power supply module 2 are connected with an alternating current input power supply; the switch power supply module 1 is used for supplying power to the programmable power output control module, and the switch power supply module 2 is used for supplying power to the liquid flow control module, the main control unit and the parameter setting and display module.
8. A frequency modulated low temperature plasma surgical device employing a frequency modulated low temperature plasma surgical blade control system according to any one of claims 1-7.
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| CN202310950411.6A CN117045342A (en) | 2023-07-31 | 2023-07-31 | Frequency modulation low temperature plasma scalpel control system and equipment thereof |
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| CN202310950411.6A CN117045342A (en) | 2023-07-31 | 2023-07-31 | Frequency modulation low temperature plasma scalpel control system and equipment thereof |
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