Plasma surgical system

Abstract

The utility model discloses a plasma operation system, which belongs to the field of medical instruments and comprises a controller, an alternating current mains supply interface, an AC-DC power supply module, a DC-DC voltage conversion module, a filter circuit, a DC-AC inversion module and a plasma load. The controller drives and controls the DC-DC voltage conversion module and the DC-AC inversion module through the first PWM generation circuit and the second PWM generation circuit; the output of the filter circuit is connected with a constant voltage control module, the constant voltage control module comprises a voltage sampling unit, a current sampling unit and an integrated operational amplifier circuit, the inputs of the voltage sampling unit and the current sampling unit are connected with the filter circuit, and the outputs of the voltage sampling unit and the current sampling unit and a gear voltage output interface of the controller are connected with the input of the integrated operational amplifier circuit; the output of the integrated operational amplifier circuit is connected with the input of the first PWM generation circuit, and the output of the first PWM generation circuit is connected with the DC-DC voltage conversion module. According to the utility model, low-voltage output and low-voltage high-resolution adjustment of the plasma operation system are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, in particular to a kind of plasma surgical system. BACKGROUND

[0002] Plasma surgical system is a new type of surgical method using low-temperature plasma real-time tissue ablation technology to treat diseases. It is suitable for various soft tissue dissection and resection in surgical operation, and can also perform ablation, hemostasis and other related treatments.

[0003] The front end of the plasma knife head has a low-temperature sub-plasma thin layer, which can break the large molecular peptide bond in the tissue and change it into a low molecular weight molecule and an atom, so as to achieve the treatment purposes of resection, ablation and hemostasis.

[0004] Chinese patent document CN217310556U discloses a plasma surgical system with multiple output interfaces, which provides a pulse power source for the plasma surgical electrode to realize the operation of the plasma surgical electrode.

[0005] The plasma surgical system generally has gear adjustment function, and each gear corresponds to a fixed voltage value. During the operation, the plasma surgical system is a constant voltage source, and the voltage value of one gear always remains constant. However, during the operation, as the protein in the operation site denatures, the impedance of the diseased tissue also changes. Because the plasma surgical system is a constant voltage source, when the impedance of the diseased tissue changes, the instantaneous output power of the plasma surgical system will also change, deviating from the ideal power, and the ideal effect cannot be achieved. At this time, the gear needs to be adjusted manually to change the voltage value so that the instantaneous output power reaches the ideal power.

[0006] When using the traditional plasma surgical system in the process of neurosurgery, even at the lowest gear output, the plasma energy formed is still easy to cause thermal injury or even functional damage to the normal important tissues such as nerves and blood vessels near the operation area, so it is necessary to adjust to a lower voltage than the lowest gear of the existing traditional plasma surgical system.

[0007] However, the voltage adjustment of the traditional plasma surgical system is relatively rough, and the voltage range between gears is wide, which cannot realize fine adjustment of the voltage, resulting in that the voltage below the lowest gear (for example, gear 1) cannot be further divided and adjusted, and each voltage value below the lowest output gear cannot be applied. UTILITY MODEL CONTENTS

[0008] The utility model provides a kind of plasma surgical system, realized low voltage output and low voltage high-resolution adjustment of plasma surgical system.

[0009] The utility model provides technical scheme as follows:

[0010] A kind of plasma surgical system, including controller, further including AC mains interface, AC-DC power module, DC-DC voltage conversion module, filter circuit, DC-AC inverter module and plasma load connected in turn;

[0011] The controller is driven control DC-DC voltage conversion module and DC-AC inverter module by first PWM generating circuit and second PWM generating circuit respectively;

[0012] The output of the filter circuit is connected with constant voltage control module, the constant voltage control module includes voltage sampling unit, current sampling unit and integrated operational amplifier circuit, the input of voltage sampling unit and current sampling unit is connected with the filter circuit, and the output voltage and output current of the filter circuit are collected, the output of voltage sampling unit, the output of current sampling unit and the gear voltage output interface of the controller are connected with the input of integrated operational amplifier circuit, the output of integrated operational amplifier circuit is connected with the input of first PWM generating circuit, and the output of first PWM generating circuit is connected with DC-DC voltage conversion module.

[0013] Further, the voltage sampling unit is a resistance voltage divider circuit, and the current sampling unit is a full-bridge rectification sampling circuit.

[0014] Further, the full-bridge rectification sampling circuit includes a current transformer, a full-bridge circuit, and a load resistor, and the resistance voltage divider circuit includes a ground voltage dividing resistor.

[0015] Further, the first PWM generating circuit and the second PWM generating circuit each include a phase-shifted PWM controller, a driving power amplifier chip, and a driving transformer.

[0016] Further, an EMC module is arranged between the AC mains interface and the AC-DC power module; the AC-DC power module is a single-phase PFC module, an overvoltage and undervoltage protection module is connected to the output of the AC-DC power module, the output of the overvoltage and undervoltage protection module is connected to the controller; an overcurrent protection module is connected to the output of the DC-DC voltage conversion module, the output of the overcurrent protection module is connected to the first PWM generating circuit; the DC-AC inverter module is configured with an over-temperature protection module, and the output of the over-temperature protection module is connected to the second PWM generating circuit.

[0017] Further, the AC-DC power module includes a single-phase bridge rectifier circuit and an energy storage filter capacitor, the DC-DC voltage conversion module includes a BUCK direct current chopper circuit, and the DC-AC inverter module includes a push-pull circuit.

[0018] Further, the plasma surgery system further comprises an auxiliary circuit module, an input of the auxiliary circuit module is connected with an alternating current mains power interface, and an output of the auxiliary circuit module is connected with the controller.

[0019] Further, the plasma surgery system further comprises a man-machine interaction module, the man-machine interaction module is connected with the controller, and the man-machine interaction module comprises one or more of a foot pedal input unit, a display unit, a prompt unit, a flow control unit and a fan cooling unit.

[0020] Further, the plasma load comprises a plasma bipolar knife head, the plasma bipolar knife head comprises a first forceps blade and a second forceps blade which are oppositely arranged at a set distance, the front end of the first forceps blade and the second forceps blade is provided with a forceps tip, the rear end of the first forceps blade and the second forceps blade is respectively connected with a respective wire, and the rear end of the first forceps blade and the second forceps blade is fixed on a joint part.

[0021] Further, the first forceps blade and / or the second forceps blade is internally provided with a pre-embedded waterway, the pre-embedded waterway extends from the rear end to the front end along the length direction of the first forceps blade and / or the second forceps blade, the front end of the first forceps blade and / or the second forceps blade is provided with a water droplet opening which is in communication with the front end of the pre-embedded waterway, and the rear end of the pre-embedded waterway is connected with a water droplet joint.

[0022] Further, the inner side surface of the forceps tip has a set width, the front end of the forceps tip is a blunt structure, and the rear end of the forceps tip has a set thickness.

[0023] The utility model has the following beneficial effects:

[0024] The utility model discloses a constant voltage control module real -time sampling filter circuit's output voltage and current value, calculates instantaneous output voltage, and feedback, compares with the set gear voltage, and constantly adjusts voltage output value, makes instantaneous voltage constantly tend to the set gear voltage, thereby realizes the constant of output voltage.

[0025] The utility model discloses a constant voltage control module real -time sampling filter circuit's output voltage and current value, calculates instantaneous output voltage, and feedback, compares with the set gear voltage, and constantly adjusts voltage output value, makes instantaneous voltage constantly tend to the set gear voltage, thereby realizes the constant of output voltage. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the module schematic view of the utility model's plasma surgery system;

[0027] Figure 2The specific circuit diagram of the constant voltage control module is shown in the following figure.

[0028] Figure 3 The overall schematic diagram of the plasma bipolar knife head is shown in the following figure.

[0029] Figure 4 The schematic diagram of the tweezers tip of the plasma bipolar knife head is shown in the following figure. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and advantages to be solved by the utility model more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0031] The utility model provides a kind of plasma surgical system, as shown in the following figure, including controller 1, and the AC power interface 2, AC-DC power module 3, DC-DC voltage conversion module 4, filter circuit 5, DC-AC inverter module 6 and plasma load 7 connected in sequence. Figures 1-4

[0032] AC power 220V input is passed through AC-DC power module 3, and AC-DC power module 3 can be rectification, filter protection module, and one specific example can be single-phase PFC module, PFC can realize the calibration of power factor, ensure that system operation is more stable and reliable, including single-phase bridge rectifier circuit and energy storage filter capacitor, and rectification is about 310V stable DC voltage.

[0033] The voltage of rectification output can enter DC-DC voltage conversion module 4 (one example of DC-DC voltage conversion module 4 can be Buck direct current chopping circuit), and a stable adjustable DC voltage (100-300V) is obtained.Then again through DC-AC inverter module 6 (one example of DC-AC inverter module can be push-pull structure circuit) inverter gets high-frequency square wave, since there is high-frequency harmonic in inverter output signal, after passing through passive filter circuit, output pure sine, voltage 0-150V, is provided to plasma load 7.

[0034] Controller 1 is driven and controlled DC-DC voltage conversion module 4 and DC-AC inverter module 6 by first PWM generating circuit 8 and second PWM generating circuit 9 respectively.The first PWM generating circuit 8 and the second PWM generating circuit 9 can be voltage type control chip, and target voltage is detected.

[0035] ​The output of the filter circuit 5 is connected with a constant voltage control module 10, the constant voltage control module 10 comprises a voltage sampling unit 11, a current sampling unit 12 and an integrated operational amplifier circuit 13, the input of the voltage sampling unit 11 and the current sampling unit 12 is connected with the filter circuit 5, and the output voltage and the output current of the filter circuit 5 are collected. The output of the voltage sampling unit 11, the output of the current sampling unit 12 and the gear voltage output interface Ug of the controller are connected with the input of the integrated operational amplifier circuit 13. The output of the integrated operational amplifier circuit 13 is connected with the input of the first PWM generating circuit 8, and the output of the first PWM generating circuit 8 is connected with the DC-DC voltage conversion module 4.

[0036] The voltage and the current are collected through the voltage sampling unit 11 and the current sampling unit 12, the comparison is carried out through the integrated operational amplifier circuit 13 and the gear voltage Ug of a certain gear, the micro-signal amplification processing is carried out in the integrated operational amplifier circuit 13, a continuously adjusted and amplified parameter is obtained, the duty cycle of the waveform output by the first PWM generating circuit 8 is adjusted, the output voltage is increased or reduced.

[0037] The utility model discloses a real-time sampling output voltage and current value of filter circuit through constant voltage control module, calculates instantaneous output voltage and feedback, through with the comparison of setting gear voltage, the voltage output value is adjusted constantly, and instantaneous voltage constantly tends to setting gear voltage, thereby realizing the constant of output voltage.

[0038] The utility model discloses a real-time sampling output voltage and current value of filter circuit through constant voltage control module, calculates instantaneous output voltage and feedback, through with the comparison of setting gear voltage, the voltage output value is adjusted constantly, and instantaneous voltage constantly tends to setting gear voltage, thereby realizing the constant of output voltage.

[0039] As an improvement of the embodiment of the utility model, the voltage sampling unit 11 is a resistance-to-ground voltage dividing circuit, and the current sampling unit 12 is a full-bridge rectification sampling circuit.

[0040] Specifically, the full-bridge rectification sampling circuit comprises a current transformer T1, a full-bridge circuit U1 and a load resistor R6. The resistance-to-ground voltage dividing circuit comprises ground voltage dividing resistors R1 and R5. The first PWM generating circuit 8 and the second PWM generating circuit 9 each comprise a phase-shifted PWM controller 14, a driving power amplifier chip and a driving transformer 15.

[0041] As Figure 2As shown, the high-frequency AC signal obtained by the current transformer T1 of the voltage sampling unit 11 passes through the full-bridge circuit U1 and then through the load resistor R6 to become a voltage signal input into the integrated operational amplifier chip U1A. Ug is the voltage given by the input gear signal, which is also given to the integrated operational amplifier chip U1A. The output voltage V+ of the voltage sampling unit 11 is divided by R1 and R5 to output a voltage to U1A. 13 is an integrated operational amplifier circuit, and three groups of input signals 1, 2 and 3 are input into the integrated operational amplifier chip U1A to obtain a continuously adjusted and amplified parameter through PI algorithm, which is given to 14. 14 is a phase-shifted PWM controller, which controls the full-bridge power stage by switching one half-bridge relative to the other half-bridge. The device supports constant frequency pulse width modulation and resonant zero voltage switching, and can provide high efficiency at high frequency. The device can be used as a voltage mode controller or a current mode controller. 14 outputs PWM waves with different pulse widths through the control of 13 to realize the final controllable output. 15 is a driving power amplifier chip and a driving transformer. The PWM wave output by 14 is not enough to directly drive the MOS tube of the main circuit, and 15 is used to improve the driving ability of the PWM wave to realize the final driving. 16 is the PWM wave finally given to the MOS tube, which is the final embodiment of the feedback loop, and different PWM waves are used to realize the controllable output of the DC-DC conversion circuit.

[0042] When a traditional plasma surgical system is used in neurosurgery, even at the minimum gear voltage output, the formed plasma energy can still cause thermal damage and even functional damage to normal important tissues such as nerves and blood vessels in the operation area. Therefore, the traditional plasma surgical system cannot realize low-power output and cannot be applied to neurosurgery, so it is necessary to continue to reduce the minimum output voltage and thus reduce the minimum output power.

[0043] The gear adjustment function of the utility model, compared with the prior art plasma surgical system, can achieve a lower minimum output voltage, and a smaller gear signal voltage (i.e. a smaller Ug) is realized by setting a corresponding program for the controller 1, so that low-voltage output is realized. In combination with the aforementioned integrated operational amplifier circuit 13, low-voltage high-resolution adjustment is realized.

[0044] The EMC module 17 is arranged between the aforementioned AC power supply interface 2 and the AC-DC power supply module 3 to perform electromagnetic protection on the circuit.

[0045] The output of the AC-DC power supply module 3 is connected with the overvoltage and undervoltage protection module 18, the output of the overvoltage and undervoltage protection module 18 is connected with the controller 1, the voltage of the input DC-DC voltage conversion module 3 is limited within a certain range to avoid the influence of power fluctuations on the circuit. The overvoltage and undervoltage protection module 18 includes a comparator for voltage sampling.

[0046] The output of the DC-DC voltage conversion module 4 is connected to the overcurrent protection module 19. The output of the overcurrent protection module 19 is connected to the first PWM generation circuit 8. When overcurrent protection occurs, the output of the first PWM generation circuit 8 is stopped immediately.

[0047] The DC-AC inverter module 6 is equipped with an over-temperature protection module 20, the output of which is connected to the second PWM generator circuit 10. During the power conversion process, the switching frequency of the MOSFET is high, resulting in significant losses. Over time, the operating temperature will continue to rise, affecting circuit performance and safety. Therefore, an over-temperature protection module is designed to stop the output of the second PWM generator circuit 10 when the temperature is too high, ensuring the safety of internal components.

[0048] The plasma surgical system of this invention also includes an auxiliary circuit module 21. The input of the auxiliary circuit module 21 is connected to the AC mains interface 2, and the output is connected to the controller 1. The auxiliary circuit module 21 is an AC-DC power supply module, through which 220V mains power is used to generate the power required by the system.

[0049] Furthermore, the plasma surgical system also includes a human-machine interface module, which is connected to the controller 1. The human-machine interface module includes one or more of the following: a foot pedal input unit 22, a display unit 23, a prompting unit 24, a flow control unit 25, and a fan cooling unit 26.

[0050] Traditional plasma cutting tips are vertically designed straight-bar bipolar devices, which are only suitable for coagulation and ablation of soft tissues in the target area during neurosurgery. They cannot perform precise cutting operations on target tissues, especially hard and tough tissues. At the same time, the straight-bar design of the plasma cutting tip has no support point for positioning, and it is easy to deviate from the target area during movement.

[0051] The plasma load 7 of this invention is a plasma bipolar cutter head, such as... Figure 3 , 4 As shown, it includes a first tweezers 701 and a second tweezers 702 that are arranged at a set distance from each other. The front ends of the first tweezers 701 and the second tweezers 702 are provided with tweezer tips 703. The rear ends of the first tweezers 701 and the second tweezers 702 are respectively connected to their respective wires. The rear ends of the first tweezers 701 and the second tweezers 702 are fixed on a connector component 705.

[0052] When this utility model is in operation, the wires of the first forceps 701 and the second forceps 702 are connected to an external power source. Physiological saline is excited at one of the forceps tips 703 at the front end to form plasma, which is used to cut, ablate, coagulate and stop bleeding at the surgical site, and form a loop with the other forceps tip 703.

[0053] The utility model discloses a pair of forceps, comprising a first forceps piece 701 and a second forceps piece 702, the first forceps piece 701 and the second forceps piece 702 are connected by a joint part 705, the first forceps piece 701 and the second forceps piece 702 are provided with a pair of forceps tips 703, the first forceps piece 701 and the second forceps piece 702 are provided with a pair of forceps tips 703, one of the forceps tips is used for positioning the operation area, and the other forceps tip is slowly moved to the forceps tip direction on the surface of the target tissue in the operation area, which can be used for fine cutting operation on the surface and realizes the positioning and fine block cutting.

[0054] The first forceps piece 701 and / or the second forceps piece 702 are internally provided with a pre-buried waterway 704, the pre-buried waterway 704 extends from the rear end to the front end along the length direction of the first forceps piece 701 and / or the second forceps piece 702, the first forceps piece 701 and / or the second forceps piece 702 is provided with a water dripping opening 706 at the front end, the water dripping opening 706 is in communication with the front end of the pre-buried waterway 704, and the rear end of the pre-buried waterway 704 is connected with a water dripping connector 707.

[0055] The physiological saline is sequentially dripped on the operation site through the water dripping connector 707, the pre-buried waterway 704 and the water dripping opening 706, plays an auxiliary cooling role and reduces tissue adhesion during coagulation hemostasis.

[0056] Specifically, the water dripping opening 706 is arranged on the inner side of the first forceps piece 701 and / or the second forceps piece 702, and the water dripping opening 706 is located at the rear side of the forceps tip 703.

[0057] For the specific structure of the forceps tip 703, one example is that the inner side surface 708 of the forceps tip 703 has a set width, the front end 709 of the forceps tip 703 is a blunt structure, and the rear end of the forceps tip 703 has a set thickness.

[0058] As an improvement, the wires of the first forceps piece 701 and the second forceps piece 702 are bundled into a cable 710, the front end of the cable 710 extends into the joint part 705, the wires of the first forceps piece 701 and the second forceps piece 702 are connected with the first forceps piece 701 and the second forceps piece 702 in the joint part 705, and the rear end of the cable 710 is provided with a plug 711.

[0059] The water dripping connector 707 is inserted into the joint part 705, and the front end of the water dripping connector 707 is connected with the rear end of the pre-buried waterway 704 in the joint part 705.

[0060] The prior art plasma bipolar knife head is generally a long straight cylindrical structure, and the hand holding part will block the vision when operating in a narrow deep space. To solve the problem, the first forceps piece 701 and the second forceps piece 702 have a bending part 712 at the hand holding part. The arrangement of the bending part 712 makes the hand holding part and the tip working part different in axis, forms a design similar to a gun type structure, and can avoid the hand holding part from blocking the vision when operating in a narrow deep space.

[0061] Further, the first forceps piece 701 and the second forceps piece 702 are provided with anti-skid lines 713, and the anti-skid lines 713 are located at the bending part 712.

[0062] Specifically, the aforementioned tip head thickness is ≤0.5mm, the tip bottom thickness is 1.4mm, and the tip width is ≤0.3mm.

[0063] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles described in the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the scope of protection of the present application.

Claims

1. A plasma surgical system comprising a controller, characterized in that, The AC power supply interface, the AC-DC power supply module, the DC-DC voltage conversion module, the filter circuit, the DC-AC inversion module and the plasma load are sequentially connected. The controller drives and controls the DC-DC voltage conversion module and the DC-AC inversion module through the first PWM generating circuit and the second PWM generating circuit respectively. The output of the filter circuit is connected with a constant voltage control module, the constant voltage control module comprises a voltage sampling unit, a current sampling unit and an integrated operational amplifier circuit, the input of the voltage sampling unit and the current sampling unit is connected with the filter circuit, the output voltage and the output current of the filter circuit are collected, the output of the voltage sampling unit, the output of the current sampling unit and the gear voltage output interface of the controller are connected with the input of the integrated operational amplifier circuit, the output of the integrated operational amplifier circuit is connected with the input of the first PWM generating circuit, and the output of the first PWM generating circuit is connected with the DC-DC voltage conversion module.

2. The plasma surgical system of claim 1, wherein, The voltage sampling unit is a resistance-to-ground voltage dividing circuit, and the current sampling unit is a full-bridge rectification sampling circuit.

3. The plasma surgical system of claim 2, wherein, The full-bridge rectification sampling circuit comprises a current transformer, a full-bridge circuit and a load resistor, and the resistance-to-ground voltage dividing circuit comprises a resistance-to-ground voltage dividing resistor.

4. The plasma surgical system of claim 3, wherein, The first PWM generating circuit and the second PWM generating circuit each comprise a phase-shifted PWM controller, a driving power amplifier chip and a driving transformer.

5. The electrosurgical system of any one of Claims 1-4, wherein, An EMC module is arranged between the AC power supply interface and the AC-DC power supply module, the AC-DC power supply module is a single-phase PFC module, the output of the AC-DC power supply module is connected with an overvoltage and undervoltage protection module, the output of the overvoltage and undervoltage protection module is connected with the controller, the output of the DC-DC voltage conversion module is connected with an overcurrent protection module, the output of the overcurrent protection module is connected with the first PWM generating circuit, and the DC-AC inversion module is configured with an over-temperature protection module, and the output of the over-temperature protection module is connected with the second PWM generating circuit.

6. The plasma surgical system of claim 5, wherein, The AC-DC power supply module comprises a single-phase bridge rectification circuit and an energy storage filter capacitor, the DC-DC voltage conversion module comprises a BUCK direct current chopper circuit, and the DC-AC inversion module comprises a push-pull circuit.

7. The plasma surgical system of claim 6, wherein, The plasma surgical system further comprises an auxiliary circuit module, the input of the auxiliary circuit module is connected with the AC power supply interface, and the output is connected with the controller.

8. The electrosurgical system of claim 7, wherein, The plasma surgical system further comprises a human-computer interaction module, the human-computer interaction module is connected with the controller, and the human-computer interaction module comprises one or more of a foot pedal input unit, a display unit, a prompt unit, a flow control unit and a fan cooling unit.

9. The electrosurgical system of claim 8, wherein, The plasma load comprises a plasma bipolar knife head, the plasma bipolar knife head comprises a first pincer blade and a second pincer blade which are oppositely arranged at a set distance, the front end of the first pincer blade and the second pincer blade is provided with a pincer tip, the rear end of the first pincer blade and the second pincer blade is respectively connected with a respective lead wire, and the rear end of the first pincer blade and the second pincer blade is fixed on a joint part.

10. The electrosurgical system of claim 9, wherein, The first and / or second tweezers is internally provided with a pre-embedded waterway extending from the rear end to the front end along the length direction of the first and / or second tweezers, the front end of the first and / or second tweezers is provided with a water dripping opening in communication with the front end of the pre-embedded waterway, and the rear end of the pre-embedded waterway is connected with a water dripping connector.

11. The electrosurgical system of claim 10, wherein, The inner side surface of the tweezers tip has a set width, the front end of the tweezers tip is a blunt structure, and the rear end of the tweezers tip has a set thickness.

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