阅读说明：本技术 用于电外科手术的功率调节装置、主机及手术系统 (Power adjusting device for electrosurgery, main machine and operation system ) 是由 刘向东 于 2020-06-11 设计创作，主要内容包括：本发明涉及一种用于电外科手术的功率调节装置、主机及手术系统,属于外科手术设备技术领域。该系统在正常条件下,功率限制装置连续运行。当初级电流超过预设阈值时,功率限制装置关闭输出,输出功率降低到待机模式；当次级输出电流或电压超过预设阈值时,功率限制装置采用限压、限流的方式限制功率输出,从而实现了通过电源电压变化来调节输出功率的目的。(The invention relates to a power regulating device, a host and an operation system for electrosurgery, belonging to the technical field of surgical operation equipment. Under normal conditions, the power limiting device continues to operate. When the primary current exceeds a preset threshold value, the power limiting device closes the output, and the output power is reduced to a standby mode; when the secondary output current or voltage exceeds a preset threshold value, the power limiting device limits power output in a voltage limiting and current limiting mode, so that the purpose of adjusting the output power through the change of the power supply voltage is achieved.)

1. A power regulating device for electrosurgery, comprising: the device comprises a controller, a power conversion module, a current sampling module, a current setting module, a power adjusting module, an over-power protection module, a loop control module and a current control module;

the input end of the power conversion module is connected with the controller;

the input end of the current sampling module is connected with the output end of the power conversion module, and the output end of the current sampling module is connected with the input end of the current control module; the current sampling module is used for determining a first sample current value in a first working state;

the output end of the current setting module is connected with the input end of the current control module; the current setting module is used for determining a second sample current value in the first working state;

the output end of the power regulating module is connected with the input end of the controller, and the input end of the power regulating module is connected with the output end of the loop control module;

when the first sample current value is larger than the second sample current value, triggering the controller to control the power conversion module to work;

the over-power protection module is connected with the controller and used for over-power protection of the circuit.

2. The apparatus of claim 1, wherein the controller is: a double-ended output resonant half-bridge controller; the power conversion module comprises a first MOSFET driving component, a second MOSFET driving component and a resonant half-bridge circuit; the resonant half-bridge circuit comprises: a first MOSFET and a second MOSFET.

3. The apparatus of claim 1, further comprising: a bypass amplifier current sampling module;

the input end of the bypass amplifier current sampling module is connected with the output end of the current sampling module, and the output end of the bypass amplifier current sampling module is connected with the current control module.

4. The apparatus of claim 3, further comprising: a voltage loop sampling module;

the voltage loop sampling module is used for determining a sampling voltage value;

the output end of the voltage loop sampling module is connected with the input end of the loop control module, and when the sampling voltage value exceeds a reference voltage threshold value, the loop control module is triggered to control the controller to trigger the power conversion module to work.

5. The apparatus of any of claims 1-4, further comprising: a master controller; the main controller is connected with the controller.

6. The apparatus of claim 5, further comprising: a spark limiting circuit;

the spark limiting circuit is connected with the master controller;

the spark limiting circuit includes: the circuit comprises a current controller and a circuit start-stop module; and the current controller is connected with the circuit start-stop module.

7. The apparatus of claim 1, further comprising: the electrolyte injection pump is connected with the circuit; the electrolyte injection pump connecting circuit is used for connecting the electrolyte injection pump.

8. A main unit for electrosurgery, comprising a power limiting device according to any of the preceding claims.

9. A surgical system for electrosurgery comprising the host of claim 8 and a surgical electrode; the operation electrode is connected with the host; the blade portion of the surgical electrode includes at least one electrode.

10. The surgical system of claim 9, wherein a manual switch is disposed on a handle of the surgical electrode.

Technical Field

The invention belongs to the technical field of surgical operation equipment, and particularly relates to a power adjusting device, a host and an operation system for electrosurgery.

Background

Electrosurgery opens minimally invasive techniques that reduce patient bleeding and surgery-related trauma. In electrosurgical systems, monopolar or bipolar surgical electrodes are commonly used, with high-frequency electric knives, which cut or ablate tissue using high-frequency current. Where monopolar technology requires the patient to configure the negative plate, bipolar technology configurations include two electrodes and the applied current is limited to only the vicinity of the two electrodes.

Conventional electrosurgical devices generate a high voltage difference between the electrode and the target tissue, forming an arc across the physical gap between the electrode and the tissue. The high-density current passing through the tissue surface rapidly vaporizes the cell tissue, and the tissue is cut. However, current thermal effects can cause thermal damage to surrounding tissue during cutting and ablation.

The unipolar device current returns to the negative plate through the patient's body, increasing the risk of unnecessary electrical stimulation of the patient. Bipolar electrosurgical devices have an unparalleled advantage over monopolar devices in that the current path does not flow through the patient, returning from the excitation electrode to the return electrode, but may cause drying or destruction of tissue in contact with the return electrode. Furthermore, the excitation and return electrodes are often placed in close proximity, creating a risk of short circuits that may damage the electrical control system and/or damage or destroy surrounding tissue. Therefore, how to reduce unnecessary injury to the patient in the electrosurgery becomes a problem to be solved urgently.

Disclosure of Invention

In order to solve at least the above problems of the prior art, the present invention provides a power regulating device, a main machine and a surgical system for electrosurgery.

The technical scheme provided by the invention is as follows:

in one aspect, a power regulating device for electrosurgery, comprising: the device comprises a controller, a power conversion module, a current sampling module, a current setting module, a power adjusting module, an over-power protection module, a loop control module and a current control module;

the input end of the power conversion module is connected with the controller;

the input end of the current sampling module is connected with the output end of the power conversion module, and the output end of the current sampling module is connected with the input end of the current control module; the current sampling module is used for determining a first sample current value in a first working state;

the output end of the current setting module is connected with the input end of the current control module; the current setting module is used for determining a second sample current value in the first working state;

the output end of the power regulating module is connected with the input end of the controller, and the input end of the power regulating module is connected with the output end of the loop control module;

when the first sample current value is larger than the second sample current value, triggering the controller to control the power conversion module to work;

the over-power protection module is connected with the controller and used for over-power protection of the circuit.

Optionally, the controller is: a double-ended output resonant half-bridge controller; the power conversion module comprises a first MOSFET driving component, a second MOSFET driving component and a resonant half-bridge circuit; the resonant half-bridge circuit comprises: a first MOSFET and a second MOSFET.

Optionally, the method further includes: a bypass amplifier current sampling module;

the input end of the bypass amplifier current sampling module is connected with the output end of the current sampling module, and the output end of the bypass amplifier current sampling module is connected with the current control module.

Optionally, the method further includes: a voltage loop sampling module;

the voltage loop sampling module is used for determining a sampling voltage value;

the output end of the voltage loop sampling module is connected with the input end of the loop control module, and when the sampling voltage value exceeds a reference voltage threshold value, the loop control module is triggered to control the controller to trigger the power conversion module to work.

Optionally, the method further includes: a master controller; the main controller is connected with the controller.

Optionally, the method further includes: a spark limiting circuit;

the spark limiting circuit is connected with the master controller;

the spark limiting circuit includes: the circuit comprises a current controller and a circuit start-stop module; and the current controller is connected with the circuit start-stop module.

Optionally, the method further includes: the electrolyte injection pump is connected with the circuit; the electrolyte injection pump connecting circuit is used for connecting the electrolyte injection pump.

In yet another aspect, a host for electrosurgery comprising a power limiting circuit as described in any of the above.

In yet another aspect, a surgical system for electrosurgery comprises the above-described main machine and a surgical electrode; the operation electrode is connected with the host; the blade portion of the surgical electrode includes at least one electrode.

Optionally, a manual switch is arranged on the handle of the surgical electrode.

The invention has the beneficial effects that:

according to the power regulating device, the host and the operation system for the electrosurgery provided by the embodiment of the invention, under a normal condition, the power limiting device continuously operates, when the primary current exceeds a preset threshold value, the power limiting device closes the output, and the output power is reduced to a standby mode; when the secondary output current or voltage exceeds a preset threshold value, the power limiting device limits power output in a voltage limiting and current limiting mode, so that the purpose of adjusting the output power through the change of the power supply voltage is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a power conditioning circuit for electrosurgery according to an embodiment of the present invention;

fig. 2(a) and fig. 2(b) are schematic circuit diagrams of a specific power limiting circuit according to an embodiment of the present invention;

fig. 3(a) and fig. 3(b) are schematic diagrams of a spark limiting circuit according to an embodiment of the present invention;

FIG. 4 is a schematic view of a surgical blade identification feature provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of a surgical tool tip identification circuit according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an electrolyte injection pump according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating a circuit control principle of an electrolyte injection pump according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an electrosurgical system according to an embodiment of the present invention.

Reference numerals: 1-a controller; 2-a power conversion module; 3-a current sampling module; 4-a current setting module; 5-a power regulation module; 6-an over-power protection module; 7-a loop control module; 8-a current control module; 021-resonant half-bridge circuit; 9-bypass amplifier current sampling module; 10-voltage loop sampling module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

To solve at least the technical problems set forth in the present invention, an embodiment of the present invention provides a power limiting circuit for electrosurgery.

In the embodiment of the invention, the power regulating circuit can be applied to a host machine, so that the output power of the host machine can be regulated by regulating the voltage change.

Fig. 1 is a schematic structural diagram of a power conditioning circuit for electrosurgery according to an embodiment of the present invention, and referring to fig. 1, the power conditioning circuit according to the embodiment of the present invention may include: a controller 1 and a power conversion module 2; the device comprises a current sampling module 3, a current setting module 4 and a power adjusting module 5; the system comprises an over-power protection module 6, a loop control module 7 and a current control module 8. Wherein, the input end of the power conversion module 2 is connected with the controller 1; the input end of the current sampling module 3 is connected with the output end of the power conversion module 2, and the output end of the current sampling module 3 is connected with the input end of the current control module 8; the current sampling module is used for determining a first sample current value in a first working state; the output end of the current setting module 4 is connected with the input end of the current control module 8; the current setting module is used for determining a second sample current value in the first working state; the output end of the power regulating module 5 is connected with the input end of the controller 1, and the input end of the power regulating module 5 is connected with the output end of the loop control module 7; when the first sample current value is larger than the second sample current value, the trigger controller controls the power conversion module 2 to work; the over-power protection module 6 is connected with the controller 1 and is used for over-power protection of the circuit.

In particular, in an embodiment of the present invention, the controller 1 may be selected to be a double ended output resonant half bridge controller. For example, the controller may be an L6599 double-ended output resonant half-bridge controller, and in this embodiment, the present technical solution will be described by taking L6599 as an example, but it should be noted that the controller is illustrated here, and is not limited thereto.

L6599 is a double-ended output resonant half-bridge controller, in which the high and low sides of the half-bridge are alternately turned on and off (180 ° out of phase), the ideal duty cycle is 50%, and the duty cycle (the ratio of the on-time to the switching period) in practical applications is slightly less than 50%. The chip has a fixed dead time TD interposed between the turn-off of one MOSFET and the turn-on of the other MOSFET. During this dead time, both MOSFETs are off. This dead time ensures proper converter operation, soft switching and low EMI at high frequency operation. The operating frequency of the chip is regulated by external components.

In order to prevent current overshoot during starting, the switching frequency is gradually attenuated from the set maximum value until the stable state set by the control loop, and the change of the frequency is not linear and is used for reducing the overshoot of the output voltage and achieving better regulation.

The resonant half-bridge is voltage mode controlled, so the current sense signal is only used for OCP protection. In a PWM controlled converter, the energy flow is controlled by the duty cycle of the primary switch, which is fixed in the resonant half bridge, and the energy flow is controlled by the switching frequency, which affects the current limiting. The PWM controlled conversion energy flow may be limited by terminating switch conduction and detecting a current exceeding a threshold. In a resonant half bridge, the switching frequency must be increased to turn off the switch rapidly, and at least the frequency change is seen in the next oscillation cycle, so that the frequency must be increased effectively to change the effective flow of energy, and the rate of frequency change must be slower than the frequency itself. In practice, cycle-by-cycle current limiting cannot be achieved, the signal input to the current sense must be an average of the primary current, and the time of averaging must not be too long to prevent the primary current from reaching or exceeding a maximum value.

The L6599 device provides a current sense current input (6PIN ISEN) and provides an overcurrent management system, the ISEN terminal is internally connected to the input of a first comparator, the comparison reference level is 0.8V, the second comparator reference level is 1.5V, if the external voltage applied to this terminal exceeds 0.8V, the first comparator triggers, causing the internal switch to open and discharge the charge of the Css capacitor, which rapidly increases the frequency of the oscillator, thereby limiting the transfer of energy, discharging until the ISEN terminal voltage drops by 50mV, so that the average time is in the range of 10/fmin, ensuring the rise in effective frequency, and when outputting a short circuit, the result of this operation approaches the primary current of constant peak value.

Fig. 2(a) and fig. 2(b) are schematic circuit diagrams of a specific power limiting circuit according to an embodiment of the present invention.

Referring to fig. 2(a) and 2(b), the power conversion module 2 includes a first MOSFET driving component U30, a second MOSFET driving component U32, and a resonant half bridge circuit 021. The resonant half-bridge circuit 021 includes: a first MOSFET Q1 and a second MOSFET Q2. L6599D is illustrated with U31 as the reference number, and the high side floating gate drive output pin HVG, i.e., 15 pin, of U31 may be connected to CDD pin 1 of U30 via D73 and R315, which are connected in parallel. In this embodiment, EG3001 may be preferred for both U30 and U31. The high-side gate drive floating supply VBOOT pin of L6599D, i.e., pin 16, may be connected to pin 14 of L6599D via capacitor C240, pin 14 being connected to one side of L22. Pin 12 of L6599D is connected to 13VDC and pin 9 is connected to ground. Pin 8 of U30 is connected to 16VSB through resistor R301 and diode D2; the pin 6 is connected to the pin 7, then connected to the collector of the transistor Q23 through a diode and a resistor, and connected to the base of the transistor Q23 through the resistor R318, and after the resistor R320 is connected in parallel between the collector and the emitter of the transistor Q23, the two are connected between the gate and the source of the first MOSFET, and the drain is connected to the diodes D62 and D63 connected in parallel. As shown in fig. 2, the specific circuit connection relationship between U30 and U32 can be understood by those skilled in the art without any doubt by referring to fig. 2.

Referring to fig. 2(a) and 2(b), the current sampling module 3 may include a sampling resistor RISI (see fig. 2(a)), and a voltage value collected through the sampling resistor RISI to determine a sampling current ISI, and the current ISI is amplified through resistors R46 and R50, capacitors C53 and C52, and an operational amplifier U8 and then compared with a preset current value. Here, ISI is the first sample current value.

Referring to fig. 2(a) and 2(b), the current setting module 4 may include: and after the current setting is finished, the current setting module 4 determines the cut-off current of the current setting point ISET-OUT, namely the second sample current value, and compares the first sample current value with the second sample current value through the current control module. When the circuit is over-current, a loop control signal V/I is output through the loop control module 7. The current control module may be U78 and peripheral components.

The loop control module 7 may include: U10A, U10A are preferably LM 2904.

Optionally, in order to avoid runaway caused by current sampling failure, a bypass amplifier current sampling module 9 may be added. Referring to fig. 2(a) and 2(b), the bypass amplifier current sampling module 9 may include U7A, preferably, U7A model LM2904V, the ISI is provided at the input terminal of the bypass amplifier current sampling module, the action value of the ISI is 120% of the normal protection current value, and the integrated signal passes through the operational amplifier U10A to generate the loop control signal V/I, so as to flow into the power adjusting module 5.

The power adjusting module 5 may include an optical coupler U33, preferably, the model is CNY66B, an input loop control signal V/I enters U33, and an output end of U33 is connected to a capacitor and a resistor, and then connected to a pin 5 and a pin 6 of U31, where, referring to fig. 2, a specific connection relationship between the capacitor and the resistor allows U33 to adjust a working frequency of U31 in real time, so as to control switching frequencies of the first MOSFET and the second MOSFET, and limit a maximum output current. For example, in the present embodiment, the output current limit operation time of the circuit is 600 us.

Referring to fig. 2(a) and 2(b), the over-power protection function of the over-power protection module 6 for the circuit can be realized by a signal sampling network composed of R323, R324, C244, D69, D72, C250, R331, and C251, and the operation time is 100 ms.

Normally, the voltage at the ISEN terminal may overshoot to 0.8V, and of course if the voltage at the ISEN terminal reaches 1.5V, the second comparator will be triggered, L6599 will turn off, lock the two output drivers and let the PFC _ STOP terminal go low, thus turning off the whole system, the supply voltage of the IC must be pulled below UVLO, and the IC will not start up until it rises above the start level again.

The output current control circuit of the invention adopts a closed-loop control mode to carry out real-time control on the output current. In the embodiment of the present invention, different current sampling circuits are triggered according to different working states, and in the primary stage, the current sampling module may be triggered to perform sampling, and also in other working states, the current loop sampling module may be triggered to perform sampling, and switching of the working states is known by those skilled in the art and is not described herein.

Optionally, the circuit provided in the embodiment of the present invention may further include: a voltage loop sampling module 10; the voltage loop sampling module 10 is used for determining a sampling voltage value; the output end of the voltage loop sampling module is connected with the input end of the loop control module, and when the sampling voltage value exceeds the reference voltage threshold value, the loop control module is triggered to trigger the controller, so that the power conversion module is triggered to work.

For example, referring to fig. 1, 2(a), 2(b), the voltage loop sampling module 10 may include: and after the voltage ring is set, the voltage ring sampling circuit 10 forms a complete closed loop, so that the cut-off voltage of the voltage ring sampling circuit can be determined, namely the sampling voltage value, the output voltage signal is extracted through the partial pressure of Vout sampling resistors R66, R67, R70, R71 and RV1 and compared with the set voltage signal, and when the circuit is in overvoltage, a loop control signal V/I is output through the loop control module 7. Referring to fig. 2, the voltage loop sampling module may include: u13, preferably PC 817D; U12B, preferably LM2904, is shown in detail with reference to FIG. 2(a) and FIG. 2 (b).

In the embodiment of the invention, the whole closed-loop circuit is built by using an operational amplifier and can be controlled by combining a main controller MCU (microprogrammed control Unit) to form an adjustable output limiting function and related protection, and the circuit of the embodiment sets the maximum output voltage of 60V and the maximum power output of 400W.

Optionally, a spark limiting circuit is included to prevent a spike discharge current at the surgical electrode and the surgical target site during the surgical procedure. For example, when the surgical electrode contacts a metal object, the output impedance of the electrode (with respect to the human tissue) suddenly decreases, and the output current suddenly increases. The sudden increase in current may create a spark between the surgical electrode and the metal object and may melt the surgical electrode or the metal object. When the impedance is reduced, such as when the surgical electrode contacts a metal instrument or the insulation performance of the electrode is reduced, the spark limiting device reduces the current output by controlling the output pulse group. The spark limiting device is placed at the output end, closer to the surgical electrode, and the response time of the device is faster. The output current is preferably turned off after an overcurrent is detected.

Optionally, a DC/DC module and a DC/AC module may be further included, which is understood by those skilled in the art and will not be described herein.

Fig. 3(a) and fig. 3(b) are schematic diagrams illustrating a spark limiting circuit according to an embodiment of the present invention.

The start-stop working mode of the partial circuit is an external signal control mode. In this embodiment, the current mode controller is preferably UC3846S, and the MCU signal controls the start and stop of the circuit through the circuit start-stop module. Referring to fig. 3, the circuit start control module includes R299, R300, R294, R296, R298, C228, and Q20, and the specific connection relationship thereof is shown in fig. 3 and is not described herein, wherein MMBT3904 is preferred for Q20.

In this embodiment, the operating frequency is fixed at 100KHz and the duty ratio is 50% (including dead time). The voltage loop lags the current loop and only plays an auxiliary protection role. And limiting the alternating current output current, and adopting TL1 and TL2 to carry out positive and negative half-cycle isolation sampling. Two paths of alternating current sampling signals are rectified by D55 and D56, then FOC signals formed by R258, R259, R260, R261, R262, R265, C209 and C210 are sent to a current detection input end (4pin) of the UC3846 through an RC network formed by R272, R274, R273, R275, C211 and C212, and are used for controlling and adjusting the working time of PWM output of the UC 3846. For the specific circuit connections, refer to fig. 3.

Once the surgical electrode is moved from the low impedance position and the current drop remains within an acceptable range, the surgical electrode resumes normal operation. The maximum current limit output action time of the circuit is about 25ms, and the continuous operation reaction time is about 400 us. The output current during normal therapeutic operation is about 0.2 amps or less. When the current exceeds about 2.6 amps, the spark limiting device will activate, and although this operating current is insufficient to produce a spark, there is still the possibility of a spark being produced. The maximum current limiting output function is achieved by controlling the working state time of the mosfet power devices Q16 and Q17 to work in a mode of outputting pulse groups with 50% duty ratio and equal amplitude. The number and interval times of the envelopes of the pulse train outputs vary with the load. When the current exceeds 3.0 amperes, it will effectively prevent any current from being output from the surgical electrode and alarming.

In the embodiment, the spark limiting device controls the current output to prevent sparks, and when the current is detected to be overlarge, the output is closed firstly, and the MCU gives an alarm to prompt and adjusts the output power to be less than 10W, and then the output is continuously supplied. If the output current continues to be too large, keeping the output less than 10W continues to monitor the current, the fault not taken up will form a 'hiccup' output, and the fault taken up will remain constant at less than 10W output. Until the surgeon turns off the output pedal or manual switch.

The control of the output voltage is first controlled by a power limiting device, and the compliance of the output voltage with the set voltage is detected by a spark limiting device. The +60VOUT for monitoring the output voltage of the load plays a role in double protection, and the effective value of the load voltage is controlled by adjusting the duty ratio after the voltage exceeds a set value.

The present invention configures a power limiting device and a spark limiting device in series. This configuration provides circuit isolation required by medical device power supply safety regulations. The DC/DC has primary isolation, DC/AC secondary isolation, and patient isolation. The spark limiting device is typically closer to the electrode output due to the various isolation barriers required to meet safety and regulatory standards for medical device power supplies, and the power limiting device has dual isolation from the electrode output. A lag time is designed into the response of the power limiting device. Thus, the power limiting device reacts slower, while the spark limiting device near the electrodes reacts faster.

FIG. 4 is a schematic view of a surgical blade identification feature provided in accordance with an embodiment of the present invention; fig. 5 is a schematic diagram of a surgical tool tip identification circuit according to an embodiment of the present invention.

The plasma operation electrode is a disposable operation instrument, a digital memory DS2431 is packaged in the electrode and is matched with a host machine for use, and the electrode is prevented from being reused by recording the use times of the electrode. The information stored in the plasma operation electrode needs to be written into the DS2431 in advance, and the information comprises information such as recommended work gear, batch number information and use times.

In the process of being matched with a host computer for use, when the electrode is inserted into an electrode socket of the host computer, the host computer identifies a DS2431 chip in the electrode, reads the content of a related storage area, judges whether the electrode is used, if the electrode is used, a surgical system can not execute a subsequent command, the operation is stopped, and the surgical electrode needs to be replaced; if the electrode is not used, the operation system operates normally, the working gear is automatically configured according to the read information, and an encryption code is written in a corresponding storage area of the DS2431, so that the electrode is in a used state. The operation electrode can be used once through the rules, and the aim of preventing reuse can be achieved.

FIG. 6 is a schematic structural diagram of an electrolyte injection pump according to an embodiment of the present invention; fig. 7 is a schematic diagram illustrating a circuit control principle of an electrolyte injection pump according to an embodiment of the present invention.

Referring to fig. 6-7, the injection pump selects a direct current 24V motor to configure a three-jaw special pump head, the MCU provides a PWM signal to control the start and rotation speed of the motor, and the flow of the electrolyte can be adjusted through the display screen to achieve quantitative flow control. The technical problem that in the prior art, flow supply is controlled by opening/closing the electromagnetic valve, more experience of doctors or nurses is relied on, and the flow is adjusted by adjusting the hand wheel on the electrolyte delivery pipeline, so that inconvenience is brought is solved. Referring to fig. 7, the electrolyte injection pump is connected to the circuit, and the electrolyte injection pump can be controlled by U1 and U2, preferably, U1 is preferably NSI8140W 0; the U2 is preferably A4950, and the pin 15 and the pin 16 of the U1 are connected with the pin 4 of the U2; pin 14 of U1 came from pin 3 of your sister U2; pin 13 of U1 is connected to pin 2 of U2, and other connections of U1 and U2, resistors, capacitors and other device connections are shown in fig. 7.

According to the power regulating device for the electrosurgery provided by the embodiment of the invention, under a normal condition, the power limiting device continuously operates, when the primary current exceeds the preset threshold value, the power limiting device closes the output, the output power is reduced to a standby mode, and when the secondary output current or voltage exceeds the preset threshold value, the power limiting device limits the power output in a voltage limiting and current limiting mode, so that the purpose of regulating the output power through the change of the power supply voltage is realized.

Based on a general inventive concept, an embodiment of the present invention further provides a host, where the host includes the power limiting apparatus described in any of the above embodiments.

Embodiments of the present invention also provide an electrosurgical system based on one general inventive concept.

Fig. 8 is a schematic structural diagram of an electrosurgical system according to an embodiment of the present invention. Referring to fig. 8, the medical electric water heater comprises a main machine a1, an electrode rod a2, a cutter head A3, a handle a4, an injection drainage tube a5, an output drainage tube A6, an electrode lead wire a7, a pedal adjusting key A8, a pedal cutting key a9, a pedal hemostasis key a10, a pedal lead wire a11, a flow controller a12, a flow controller cable a13, a power line a14 and a display a 15.

In embodiments of the present invention, power may be provided to the surgical electrode within various power settings and with different therapeutic effects. In the ablation mode, a sufficient voltage is applied to the surgical electrode tip to create a plasma layer, thereby effecting ablation of tissue. The voltage required for ablation will vary depending on the number, size, shape and spacing of the electrodes, the length of the electrodes, and other parameters.

In coagulation mode, host a1 applies a sufficiently low voltage to surgical electrode-tip A3 to avoid the formation of plasma to ablate tissue. The radiofrequency energy directly heats the tissue via a current flowing through the tissue, and/or indirectly heats the tissue via a fluid heated by the radiofrequency energy to raise the temperature of the tissue from normal body temperature for coagulation. During surgery, the surgeon can automatically switch between ablation and coagulation modes by alternately stepping on foot pedals a9, a10, respectively.

Embodiments of the present invention preferably provide a system that includes a three-pedal foot controller that allows the surgeon to automatically switch between coagulation and ablation modes and to select a voltage step in the ablation mode. In an embodiment, host A1 has an operator controllable voltage step adjuster A8 to change the applied voltage step, which is seen on display screen A15 as well as the adjustment conditions. The doctor can also set two working modes on the screen A15 before operation, and the voltage gears of different functions can be adjusted by touching the button. In some embodiments, mode switching functions and gear adjustments may also be accomplished by buttons located on the handle of the surgical electrode.

The energy released by the energetic electrons can be varied by adjusting a number of factors, such as: the number of excitation electrodes, the size and spacing of the electrodes, the surface area of the electrodes, the electrode surface shape, the electrode material, the applied voltage and power, the current limiting device (e.g., inductor), the conductivity of the electrolyte, and the like. Adjusting these factors can control the energy level of the excited electrons. Since different tissue structures of the human body have different molecular bonds, the present invention can be designed to break the molecular bonds of soft tissue, but cannot break the molecular bonds of other tissues because of having too low energy. For example, adipose tissue has double bonds and requires much more energy than 4 to 5 electron volts to break. Thus, the present invention in its current configuration does not typically ablate or remove adipose tissue. Of course, some parameters may be changed so that these double bonds can be broken (e.g., increasing the voltage or changing the electrode configuration to increase the current density at the electrode tip).

The surgical electrode comprises a lead wire, an electrode rod and a handle, wherein the electrode rod and the handle can adopt various configurations and mainly aim at mechanically supporting and controlling the active electrode. The electrode shaft may be rigid or flexible, and the flexible shaft may be coupled with a pull wire, shape memory, and other mechanisms for effecting selective deflection of the distal end of the electrode shaft to facilitate positioning of the electrode tip portion. The electrode shaft typically includes a plurality of wires or other axially passing electrically conductive elements to allow the excitation and return electrodes of the tool bit portion to be connected to connectors in the handle. The handle can be provided with a manual switch to replace a foot switch to control the power supply main machine to work.

For some dry environment surgical electrodes, the infusion path of the conductive liquid is configured, and the infusion path can be selected to be outside the return electrode or in the inner cavity of the return electrode catheter. The conductive liquid is directed along a fluid path to a target site. In some applications, it may also be desirable to aspirate the conductive liquid after it is directed to the target site. In addition, it may be desirable to aspirate small pieces of tissue or other fluids of the target site that are not completely broken down by the high frequency energy, such as blood, mucus, gases produced by ablation, and the like. Thus, the system of the present invention includes an aspiration channel in the surgical electrode or on another instrument for aspirating fluid from the target site. In addition, the present invention may include one or more suction electrodes disposed at the entrance of the suction lumen at the blade portion of the electrode shaft for ablating or at least reducing the volume of non-ablated tissue fragments aspirated into the lumen. The aspiration electrode is primarily used to inhibit occlusion of the lumen that would otherwise occur when larger tissue fragments are aspirated into the lumen. The suction electrode may be different from the ablation electrode, or the same electrode may serve both functions.

The voltage applied between the excitation electrode and the return electrode is of high frequency or radio frequency, the frequency used in the embodiment is 100KHz square wave, the rise time is 200ns, and the duty ratio is 50%. The power supply host output voltage is about 100-320 volts in the ablation mode and about 60-90 volts in the coagulation mode. These values will vary depending on the configuration of the surgical electrode connected to the power supply host and the desired mode of operation.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.