Plasma surgical system

Abstract

The invention 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 invention, low-voltage output and low-voltage high-resolution adjustment of the plasma operation system are realized.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, in particular to a plasma surgery system. Background Art

[0002] The plasma surgery system is a new surgical method that uses low-temperature plasma real-time tissue ablation technology to treat diseases. It is suitable for various soft tissue dissections and resections in surgical operations, and can also perform related treatments such as ablation and hemostasis.

[0003] There is a thin layer of low-temperature plasma at the front end of the plasma knife head. The electric particles it carries can break the macromolecular peptide bonds in the tissue, turning them into low-molecular-weight molecules and atoms, thereby achieving therapeutic purposes such as resection, ablation and hemostasis.

[0004] Chinese patent document CN217310556U discloses a plasma surgery system with multiple output interfaces, which provides a pulse power supply with required energy for a plasma surgery electrode, thereby realizing the operation of the plasma surgery electrode.

[0005] Plasma surgical systems generally have a 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 a gear always remains constant. However, during the operation, as the protein in the surgical 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 failing to achieve the ideal effect. At this time, it is necessary to manually adjust the gear and change the voltage value so that the instantaneous output power reaches the ideal power.

[0006] When using a traditional plasma surgical system during neurosurgery, even at the lowest output level, the plasma energy generated can still easily cause thermal damage or even functional impairment to normal important tissues such as nerves and blood vessels adjacent to the operation area. Therefore, it is necessary to adjust the voltage to a lower level than the lowest level of the existing traditional plasma surgical system.

[0007] However, the voltage regulation of traditional plasma surgical systems is relatively rough, and the voltage range between each gear is wide, which makes it impossible to achieve fine voltage regulation. As a result, it is impossible to make more fine division and adjustment of the voltage below the lowest gear (such as gear 1), and all voltage values ​​below the lowest output gear cannot be applied. Summary of the invention

[0008] The invention provides a plasma surgery system, which realizes low voltage output and high resolution regulation of low voltage of the plasma surgery system.

[0009] The present invention provides the following technical solutions:

[0010] A plasma surgery system includes a controller, and also includes an AC mains interface, an AC-DC power supply module, a DC-DC voltage conversion module, a filter circuit, a DC-AC inverter module and a plasma load connected in sequence;

[0011] The controller drives and controls the DC-DC voltage conversion module and the DC-AC inverter module through the first PWM generating circuit and the second PWM generating circuit respectively;

[0012] The output of the filtering circuit is connected to a constant voltage control module, which includes 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 to the filtering circuit to collect the output voltage and output current of the filtering circuit. 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 to the input of the integrated operational amplifier circuit. The output of the integrated operational amplifier circuit is connected to the input of the first PWM generating circuit, and the output of the first PWM generating circuit is connected to the DC-DC voltage conversion module.

[0013] Furthermore, the voltage sampling unit is a resistor-to-ground voltage divider circuit, and the current sampling unit is a full-bridge rectifier sampling circuit.

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

[0015] Furthermore, the first PWM generating circuit and the second PWM generating circuit both include a phase-shift PWM controller, a driving power amplifier chip and a driving transformer.

[0016] Furthermore, an EMC module is arranged between the AC mains 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 to an overvoltage and undervoltage protection module, and the output of the overvoltage and undervoltage protection module is connected to the controller; the output of the DC-DC voltage conversion module is connected to an overcurrent protection module, and the output of the overcurrent protection module is connected to the first PWM generating circuit; the DC-AC inverter module is configured with an overtemperature protection module, and the output of the overtemperature protection module is connected to the second PWM generating circuit.

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

[0018] Furthermore, the plasma surgery system also includes an auxiliary circuit module, the input of which is connected to the AC mains interface, and the output of which is connected to the controller.

[0019] Furthermore, the plasma surgery system also includes a human-computer interaction module, which is connected to the controller; the human-computer interaction module includes one or more of a foot input unit, a display unit, a prompt unit, a flow control unit and a fan cooling unit.

[0020] Furthermore, the plasma load includes a plasma bipolar tool head, which includes a first tweezers and a second tweezers that are relatively arranged at a set distance, the front ends of the first tweezers and the second tweezers are provided with tweezer tips, the rear ends of the first tweezers and the second tweezers are respectively connected to respective wires, and the rear ends of the first tweezers and the second tweezers are fixed on a connector component.

[0021] Furthermore, a pre-buried water channel is provided inside the first tweezers and / or the second tweezers, and the pre-buried water channel extends from the rear end to the front end along the length direction of the first tweezers and / or the second tweezers. A drip outlet connected to the front end of the pre-buried water channel is provided at the front end of the first tweezers and / or the second tweezers, and a drip joint is connected to the rear end of the pre-buried water channel.

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

[0023] The present invention has the following beneficial effects:

[0024] The present invention samples the output voltage and current value of the filter circuit in real time through a constant voltage control module, calculates the instantaneous output voltage, and feeds back the calculated instantaneous output voltage. By comparing the calculated instantaneous output voltage with the set gear voltage, the voltage output value is continuously adjusted so that the instantaneous voltage continuously tends to the set gear voltage, thereby achieving a constant output voltage.

[0025] By integrating operational amplifier circuits, the amplification and compensation processing of tiny signals is strengthened, the accuracy of feedback sampling is ensured, the precision of feedback control is improved, low-voltage output below the traditional lowest gear is achieved, and small-range fine adjustment of low voltage is achieved, that is, high-resolution adjustment of low voltage of the plasma surgical system is achieved, so that various voltage values ​​below the traditional lowest output gear can be used, ensuring the application of the plasma surgical system in neurosurgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of a module of a plasma surgery system according to the present invention;

[0027] FIG2 is a specific circuit diagram of a constant voltage control module;

[0028] FIG3 is an overall schematic diagram of a plasma bipolar cutter head;

[0029] FIG. 4 is a schematic diagram of the tweezer tip of the plasma bipolar tool head. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0031] The present invention provides a plasma surgery system, as shown in Figures 1-4, including a controller 1, and an AC mains interface 2, an AC-DC power supply module 3, a DC-DC voltage conversion module 4, a filter circuit 5, a DC-AC inverter module 6 and a plasma load 7 connected in sequence.

[0032] The 220V mains power input passes through the AC-DC power module 3. The AC-DC power module 3 can be a rectification, filtering and protection module. A specific example can be a single-phase PFC module. PFC can realize power factor calibration to ensure that the system runs more stably and reliably. It includes a single-phase bridge rectifier circuit and an energy storage filter capacitor, which is rectified into a stable DC voltage of about 310V.

[0033] The rectified output voltage can enter the DC-DC voltage conversion module 4 (an example of the DC-DC voltage conversion module 4 can be a Buck DC chopper circuit) to obtain a stable and adjustable DC voltage (100-300V). Then it is inverted into a high-frequency square wave through the DC-AC inverter module 6 (an example of the DC-AC inverter module can be a push-pull structure circuit). Since the inverter output signal has high-frequency harmonics, it outputs a pure sine wave after passing through the passive filter circuit, with a voltage of 0-150V, which is provided to the plasma load 7.

[0034] The controller 1 drives and controls the DC-DC voltage conversion module 4 and the DC-AC inverter module 6 respectively through the first PWM generating circuit 8 and the second PWM generating circuit 9. The first PWM generating circuit 8 and the second PWM generating circuit 9 can be voltage type control chips to detect the target voltage.

[0035] The output of the filter circuit 5 is connected to a constant voltage control module 10, which includes a voltage sampling unit 11, a current sampling unit 12 and an integrated operational amplifier circuit 13. The inputs of the voltage sampling unit 11 and the current sampling unit 12 are connected to the filter circuit 5 to collect the output voltage and output current of the filter circuit 5. 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 to the input of the integrated operational amplifier circuit 13. The output of the integrated operational amplifier circuit 13 is connected to the input of the first PWM generating circuit 8, and the output of the first PWM generating circuit 8 is connected to the DC-DC voltage conversion module 4.

[0036] The voltage and current are collected by the voltage sampling unit 11 and the current sampling unit 12, and compared with the gear voltage Ug of a certain gear set by the integrated operational amplifier circuit 13. The small signal is amplified in the integrated operational amplifier circuit 13 to obtain a continuously adjusted and amplified parameter, and the duty cycle of the waveform output by the first PWM generating circuit 8 is adjusted to increase or decrease the output voltage.

[0037] The present invention samples the output voltage and current value of the filter circuit in real time through a constant voltage control module, calculates the instantaneous output voltage, and feeds back the calculated instantaneous output voltage. By comparing the calculated instantaneous output voltage with the set gear voltage, the voltage output value is continuously adjusted so that the instantaneous voltage continuously tends to the set gear voltage, thereby achieving a constant output voltage.

[0038] By integrating operational amplifier circuits, the amplification and compensation processing of tiny signals is strengthened, the accuracy of feedback sampling is ensured, the precision of feedback control is improved, low-voltage output below the traditional lowest gear is achieved, and small-range fine adjustment of low voltage is achieved, that is, high-resolution adjustment of low voltage of the plasma surgical system is achieved, so that various voltage values ​​below the traditional lowest output gear can be used, ensuring the application of the plasma surgical system in neurosurgery.

[0039] As an improvement of the embodiment of the present invention, the aforementioned voltage sampling unit 11 is a resistor-to-ground voltage divider circuit, and the current sampling unit 12 is a full-bridge rectifier sampling circuit.

[0040] Specifically, the full-bridge rectifier sampling circuit includes a current transformer T1, a full-bridge circuit U1 and a load resistor R6. The resistor-to-ground voltage divider circuit includes ground voltage divider resistors R1 and R5. The first PWM generating circuit 8 and the second PWM generating circuit 9 both include a phase-shift PWM controller 14, a driving power amplifier chip and a driving transformer 15.

[0041] As shown in FIG2 , 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 is converted into a voltage signal through the load resistor R6 and input into the integrated operational amplifier chip U1A. Ug is the voltage setting of 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. The three groups of input signals 1, 2, and 3 are subjected to the PI algorithm through the integrated operational amplifier chip U1A to obtain a continuously adjusted and amplified parameter and given to 14. 14 is a phase-shifted PWM controller, which realizes the control of the full-bridge power level by switching one half-bridge relative to the other half-bridge by phase shift. 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 of different pulse widths through the control of 13 to achieve the final controllable output. 15 is the driving power amplifier chip and the driving transformer. The PWM wave output by 14 is not enough to directly drive the MOS tube of the main circuit. The driving ability of the PWM wave is improved through 15 to achieve the final drive. 16 is the final PWM wave given to the MOS tube, which is the final embodiment of the feedback loop. The controllable output of the DC-DC conversion circuit is achieved through different PWM waves.

[0042] When using traditional plasma surgical systems in neurosurgery, even at the lowest voltage output, the plasma energy generated can still easily cause thermal damage or even functional damage to normal important tissues such as nerves and blood vessels in the operation area. Therefore, traditional plasma surgical systems cannot achieve low power output and cannot be used in neurosurgery, so it is necessary to further reduce the minimum output voltage, thereby reducing the minimum output power.

[0043] Compared with the plasma surgical system in the prior art, the gear adjustment function of the present invention can achieve a lower minimum output voltage, and a smaller voltage setting (i.e., a smaller Ug) of the gear signal can be achieved by setting a corresponding program on the controller 1, thereby achieving a low voltage output. In conjunction with the aforementioned integrated operational amplifier circuit 13, high-resolution regulation of low voltage can be achieved.

[0044] An EMC module 17 is provided between the aforementioned AC mains interface 2 and the AC-DC power module 3 to provide electromagnetic protection for the circuit.

[0045] The output of the AC-DC power supply module 3 is connected to an overvoltage and undervoltage protection module 18, and the output of the overvoltage and undervoltage protection module 18 is connected to the controller 1 to limit the voltage input to the DC-DC voltage conversion module 3 within a certain range to avoid the influence of the mains power fluctuation 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, and the output of the overcurrent protection module 19 is connected to the first PWM generating circuit 8. When the overcurrent protection occurs, the output of the first PWM generating circuit 8 is quickly stopped at the first time.

[0047] The DC-AC inverter module 6 is equipped with an over-temperature protection module 20, and the output of the over-temperature protection module 20 is connected to the second PWM generating circuit 10. During the circuit power conversion process, the switching frequency of the MOS tube is high, the loss is large, and the temperature will continue to rise after a long working time, affecting the circuit performance and safety. Therefore, the over-temperature protection module is designed to stop the output of the second PWM generating circuit 10 when the temperature is too high to ensure the safety of internal devices.

[0048] The plasma surgery system of the present invention further comprises 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 module, and the 220V mains electricity passes through the auxiliary circuit module 21 to generate the power required by the system.

[0049] Furthermore, the plasma surgery system further comprises a human-machine interaction module, which is connected to the controller 1. The human-machine interaction module comprises one or more of a pedal input unit 22, a display unit 23, a prompt unit 24, a flow control unit 25 and a fan cooling unit 26.

[0050] The traditional plasma blade is a vertically designed straight-rod bipolar blade, which is only suitable for coagulation and ablation of soft tissue in the target area during neurosurgery, and cannot achieve fine cutting operations on the target tissue, especially hard and tough tissue. At the same time, the straight-rod plasma blade has no support point for positioning and is prone to deviate from the target area during movement.

[0051] The plasma load 7 of the present invention is a plasma bipolar tool head, as shown in Figures 3 and 4, which includes a first tweezers 701 and a second tweezers 702 that are relatively arranged at a set distance, 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 respective wires, and the rear ends of the first tweezers 701 and the second tweezers 702 are fixed on a connector component 705.

[0052] When the present invention is working, the wires of the first tweezers 701 and the second tweezers 702 are connected to an external power source, and physiological saline is excited at a tweezer tip 703 at the front end to form plasma, which cuts and ablates the surgical site, coagulates and stops bleeding, and forms a loop at the other tweezer tip 703.

[0053] When the present invention is in use, one of the forceps tips is used to locate the surgical area, and the other forceps tip slowly moves toward the forceps tip on the surface of the target tissue in the surgical area, which can be used for fine cutting operations on the surface, thereby achieving positioned and fine block cutting.

[0054] The first tweezers 701 and / or the second tweezers 702 are provided with a pre-buried water channel 704 inside, and the pre-buried water channel 704 extends from the rear end to the front end along the length direction of the first tweezers 701 and / or the second tweezers 702. The front end of the first tweezers 701 and / or the second tweezers 702 is provided with a drip outlet 706 connected to the front end of the pre-buried water channel 704, and the rear end of the pre-buried water channel 704 is connected to a drip joint 707.

[0055] Physiological saline drips onto the surgical site through the drip joint 707, the pre-buried water channel 704 and the drip port 706 in sequence, which plays a role in assisting cooling and reducing tissue adhesion during coagulation and hemostasis.

[0056] Specifically, the drip port 706 is opened on the inner side of the first tweezers 701 and / or the second tweezers 702 , and the drip port 706 is located at the rear side of the tweezers tip 703 .

[0057] As for the specific structure of the tweezer tip 703, an example thereof is: the inner side surface 708 of the tweezer tip 703 has a set width, the front end 709 of the tweezer tip 703 is a blunt structure, and the rear end of the tweezer tip 703 has a set thickness.

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

[0059] The drip connector 707 is inserted into the connector component 705 , and the front end of the drip connector 707 is connected to the rear end of the pre-buried water channel 704 in the connector component 705 .

[0060] The plasma bipolar blade of the prior art is generally a long straight cylindrical structure, and the handheld portion will block the field of vision when operating in a narrow and deep space. To solve this problem, the first tweezers 701 and the second tweezers 702 of the present invention have a bending portion 712 at the handheld portion. The setting of the bending portion 712 makes the handheld portion and the tip working portion not coaxial, forming a design similar to a gun-shaped structure, which can avoid the handheld portion blocking the field of vision when operating in a narrow and deep space.

[0061] Furthermore, the first tweezers 701 and the second tweezers 702 are provided with anti-slip patterns 713 , and the anti-slip patterns 713 are located at the bending portion 712 .

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

[0063] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A plasma surgery system, comprising a controller, characterized in that: It also includes an AC mains interface, an AC-DC power module, a DC-DC voltage conversion module, a filter circuit, a DC-AC inverter module and a plasma load that are connected in sequence; The controller drives and controls the DC-DC voltage conversion module and the DC-AC inverter module through the first PWM generating circuit and the second PWM generating circuit respectively; The output of the filtering circuit is connected to a constant voltage control module, which includes 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 to the filtering circuit to collect the output voltage and output current of the filtering circuit. 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 to the input of the integrated operational amplifier circuit. The output of the integrated operational amplifier circuit is connected to the input of the first PWM generating circuit, and the output of the first PWM generating circuit is connected to the DC-DC voltage conversion module.

2. The plasma surgery system according to claim 1, characterized in that: The voltage sampling unit is a resistor-to-ground voltage divider circuit, and the current sampling unit is a full-bridge rectifier sampling circuit.

3. The plasma surgery system according to claim 2, characterized in that: The full-bridge rectification sampling circuit includes a current transformer, a full-bridge circuit and a load resistor, and the resistor-to-ground voltage-dividing circuit includes a ground voltage-dividing resistor.

4. The plasma surgery system according to claim 3, characterized in that: The first PWM generating circuit and the second PWM generating circuit both include a phase-shift PWM controller, a driving power amplifier chip and a driving transformer.

5. The plasma surgery system according to any one of claims 1 to 4, characterized in that: An EMC module is arranged between the AC mains 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 to an overvoltage and undervoltage protection module, and the output of the overvoltage and undervoltage protection module is connected to the controller; the output of the DC-DC voltage conversion module is connected to an overcurrent protection module, and the output of the overcurrent protection module is connected to the first PWM generating circuit; the DC-AC inverter module is provided with an overtemperature protection module, and the output of the overtemperature protection module is connected to the second PWM generating circuit.

6. The plasma surgery system according to claim 5, characterized in that: The AC-DC power supply module includes a single-phase bridge rectifier circuit and an energy storage filter capacitor, the DC-DC voltage conversion module includes a BUCK DC chopper circuit, and the DC-AC inverter module includes a push-pull circuit.

7. The plasma surgery system according to claim 6, characterized in that: The plasma surgery system further comprises an auxiliary circuit module, the input of which is connected to an AC mains interface, and the output of which is connected to a controller.

8. The plasma surgery system according to claim 7, characterized in that: The plasma surgery system further comprises a human-machine interaction module, which is connected to the controller; the human-machine interaction module comprises one or more of a pedal input unit, a display unit, a prompt unit, a flow control unit and a fan cooling unit.

9. The plasma surgery system according to claim 8, characterized in that: The plasma load includes a plasma bipolar tool head, which includes a first tweezers and a second tweezers that are relatively arranged at a set distance, the front ends of the first tweezers and the second tweezers are provided with tweezer tips, the rear ends of the first tweezers and the second tweezers are respectively connected to respective wires, and the rear ends of the first tweezers and the second tweezers are fixed on a connector component.

10. The plasma surgery system according to claim 9, characterized in that: A pre-buried water channel is arranged inside the first tweezers and / or the second tweezers, and the pre-buried water channel extends from the rear end to the front end along the length direction of the first tweezers and / or the second tweezers. A drip outlet connected to the front end of the pre-buried water channel is opened at the front end of the first tweezers and / or the second tweezers, and a drip joint is connected to the rear end of the pre-buried water channel.

11. The plasma surgery system according to claim 10, characterized in that: The inner side surface of the tweezer tip has a set width, the front end of the tweezer tip is a blunt structure, and the rear end of the tweezer tip has a set thickness.

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