Cold plasma jet therapy system

Abstract

The utility model discloses a cold plasma jet treatment system, which belongs to the field of medical instruments and comprises a main control module, an airflow control module, an alternating current mains supply interface, a direct current power supply module, a cold plasma jet power supply module and a cold plasma jet output interface, the main control module is connected with the airflow control module and the cold plasma jet power supply module; the cold plasma jet power supply module comprises a half-bridge switch unit, a voltage transformation unit and a resonance unit, the half-bridge switch unit is connected with the output of the direct-current power supply module, the voltage transformation unit is connected with the output of the half-bridge switch unit, the resonance unit comprises a resonant capacitor, and the resonant capacitor is connected with the output end of the voltage transformation unit in parallel. The half-bridge switch unit is connected in parallel with the leakage inductor of the voltage transformation unit to form an LC resonance circuit, and is connected with a PWM controller. The resonance unit is added, so that the output is standard sine waves, the electric shock feeling is improved, the jet flow is more uniform and stable, the electric shock feeling is basically avoided, and the jet flow temperature is reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a cold plasma jet therapy system. Background Art

[0002] Plasma is a neutral state of matter composed of ions, electrons, and un-ionized neutral particles. Cold plasma jets are generated by ionizing working gases under atmospheric pressure through an externally applied high voltage, and usually consist of charged particles, free radical groups, electrons, and various active particles. Since the plasma is ejected with the airflow and is close to room temperature, it is called a "cold plasma jet". The application of cold plasma jets in the biomedical field has received increasing attention. Many studies have confirmed that it can effectively inactivate various pathogenic microorganisms such as bacteria, fungi, and viruses, and has achieved very good research results in dental treatment, beauty, hemostasis and anti-inflammatory, wound healing, skin disease treatment, and tumor treatment.

[0003] In particular, due to its extensive sterilization ability, plasma can reduce the bacterial load in wounds and prevent wound infections; its active substances can promote blood coagulation, activate immune cells, regulate immune responses, inhibit inflammation, promote blood vessel proliferation, improve tissue microcirculation, promote cell proliferation, and tissue repair; at the same time, it also has the advantages of little stimulation, mild pain, quick effect, and convenient use, and can be widely used in the treatment of patients' wounds and wounds.

[0004] Chinese Patent Document CN218870448U discloses a multi-functional plasma energy system. Although its power supply type is an AC sine wave, there is an electric shock feeling when the load generates a cold plasma jet, and the temperature is relatively high during use. There is a potential risk of stimulating normal tissues and causing protein denaturation. Especially due to the high sensitivity of skin wounds and wound treatment, patients often have a pain stimulus, resulting in the inability to tolerate the treatment, which greatly limits its clinical application. Summary of the Utility Model

[0005] The utility model provides a cold plasma jet therapy system, which adds a resonance unit to improve the resonance waveform of the high-frequency signal output by the voltage transformation unit to make it a standard sine wave. Even when the voltage increases, it can still output a uniform and stable jet, achieving basically no electric shock feeling and significantly reducing the temperature.

[0006] The technical solution provided by the utility model is as follows:

[0007] A cold plasma jet therapy system includes an AC mains interface, a DC power supply module, a cold plasma jet power supply module, a cold plasma jet output interface, a main control module, and an air flow control module, wherein:

[0008] The AC mains interface, DC power supply module, cold plasma jet power supply module, and cold plasma jet output interface are connected in sequence, and the main control module is connected to the air flow control module and the cold plasma jet power supply module;

[0009] The cold plasma jet power supply module includes a half-bridge switch unit, a transformer unit, and a resonance unit. The half-bridge switch unit is connected to the output of the DC power supply module, the transformer unit is connected to the output of the half-bridge switch unit, the resonance unit is connected to the output of the transformer unit, and the half-bridge switch unit is connected to a PWM controller for controlling the half-bridge switch unit;

[0010] The resonance unit includes a resonance capacitor. The resonance capacitor is connected in parallel with the output terminal of the transformer unit, and the resonance capacitor is connected in parallel with the leakage inductance of the transformer unit to form an LC resonance circuit.

[0011] Furthermore, the DC power supply module includes a power switch, a first filter unit, a full-bridge rectifier unit, and a second filter unit. The first filter unit is connected to the AC mains interface, the power switch is arranged between the first filter unit and the AC mains interface, the full-bridge rectifier unit is connected to the output of the first filter unit, the second filter unit is connected to the output of the full-bridge rectifier unit, and the output of the second filter unit is connected to the half-bridge switch unit.

[0012] Furthermore, the main control module is connected to a cold plasma jet control board, and the cold plasma jet control board is connected to the cold plasma jet power supply module.

[0013] Furthermore, the main control module is connected to a control switch and a display module.

[0014] Furthermore, the control switch is a foot switch, and the foot switch includes a foot button.

[0015] Furthermore, the AC mains interface is connected to an auxiliary circuit module, and the auxiliary circuit module is connected to the main control module.

[0016] Furthermore, the capacitance of the resonance capacitor is 20 nF, and the magnitude of the leakage inductance of the transformer unit is 490 mH.

[0017] The utility model has the following beneficial effects:

[0018] In the cold plasma jet therapy system of the present utility model, a parallel resonance capacitor is added behind the voltage transformation unit, which is connected in parallel with the leakage inductance of the voltage transformation unit to form an LC resonance circuit for resonance point matching, improving the resonance waveform of the high-frequency signal output by the voltage transformation unit to make it a standard sine wave. Even when the voltage increases, the jet is more uniform and stable, achieving basically no electric shock feeling and a lower jet temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cold plasma jet therapy system of the present utility model;

[0020] Figure 2 It is a connection schematic diagram of the DC power supply module and the cold plasma jet power supply module; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the technical problems, technical solutions and advantages to be solved by the present utility model clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0022] The present utility model provides a cold plasma jet therapy system, as Figure 1-2 shown, including an AC mains interface 1, a DC power supply module 2, a cold plasma jet power supply module 3, a cold plasma jet output interface 4, a main control module 7, an air flow control module 9 and a cold plasma jet knife head 11, where:

[0023] The AC mains interface 1 is connected to the DC power supply module 2. The AC mains interface 1 receives single-phase 220V AC mains and supplies it to the DC power supply module 2, and the DC power supply module 2 converts the 220V AC mains into direct current and outputs it.

[0024] The cold plasma jet power supply module 3 is connected to the DC power supply module 2, and the DC power supply module 2 provides direct current to the cold plasma jet power supply module 3. The cold plasma jet output interface 4 is connected to the cold plasma jet power supply module 3, and the cold plasma jet knife head 11 is connected to the cold plasma jet output interface 4.

[0025] The cold plasma jet power supply module 3 receives the direct current provided by the DC power supply module 2 and outputs a high-frequency AC signal of 5KHz - 30KHz to the cold plasma jet output interface 4 for the use of the cold plasma jet knife head 11.

[0026] The present utility model does not limit the form of the cold plasma jet knife head 11. The ion cold plasma jet knife head 11 in the prior art generally includes a knife head assembly, a jet handle, a power supply wire, and an air inlet pipe. The power supply wire is connected to the cold plasma jet output interface 4, and the wires inside the power supply wire pass through the jet handle and are connected to the high-voltage electrode and the ground electrode inside the knife head assembly. The inert gas blown in through the air inlet pipe is ionized under the high voltage of the high-voltage electrode to generate cold plasma, which is ejected along with the air flow to form a cold plasma jet.

[0027] The main control module 7 is directly or indirectly connected to the air flow control module 9 and the cold plasma jet power module 3, and controls the operation of each corresponding module through the main control module 7. After the main control module 7 works, it directly adjusts the air flow control module 9 according to the control instruction, indirectly adjusts the working state of the cold plasma jet power module 3, and finally outputs energy to the cold plasma jet knife head 11.

[0028] The cold plasma jet power module 3 is connected to the power supply wire of the cold plasma jet knife head 11 through the cold plasma jet output interface 4 to supply power to the cold plasma jet knife head 11. The inert gas enters the cold plasma jet knife head through the air inlet pipe of the cold plasma jet knife head and reaches the working end of the high-voltage electrode. The air flow control module 9 controls the on-off and flow rate of the inert gas to realize the use of the cold plasma jet knife head 11.

[0029] The air flow control module 9 can adopt a gas flow controller, whose flow rate adjustment range is 1 - 10 slm, is controlled by a pneumatic solenoid valve, has a digital display function, and the flow rate is adjusted by a knob.

[0030] The cold plasma jet power module 3 includes a half-bridge switch unit 16 and a transformer unit 18. The half-bridge switch unit 16 is connected to the output of the DC power module 2, the transformer unit 18 is connected to the output of the half-bridge switch unit 16, and the resonance unit 19 is connected to the output of the transformer unit 18.

[0031] In the prior art (CN218870448U), the cold plasma jet has an electric shock feeling and a relatively high temperature, which cannot meet the clinical requirements for lower temperature, pain stimulation, etc. The present utility model adds a resonance unit 19 behind the transformer unit 18.

[0032] The resonance unit 19 includes a resonance capacitor, that is Figure 2 C4 in, this resonance capacitor is connected in parallel with the output end of the transformer unit 18, and this resonance capacitor is connected in parallel with the leakage inductance of the transformer unit 18 to form an LC resonance circuit. In one example, the capacitance of the resonance capacitor is 20 nF, and the magnitude of the leakage inductance of the transformer unit 18 is 490 mH, as Figure 2 shown.

[0033] The resonant unit 19 is used for resonance point matching to improve the resonant waveform of the high-frequency signal output by the voltage transformation unit 18, making it a standard AC sine wave. Even when the voltage increases, the jet is more uniform and stable, achieving basically no electric shock sensation and a lower jet temperature. The cold plasma jet head 11 is connected to the output of the resonant unit 19, and the half-bridge switching unit 16 is connected to a PWM controller 17 that controls the half-bridge switching unit 16.

[0034] The half-bridge switching unit 16 includes capacitors C2 and C3, and MOS transistors G9 and G10, and their connection relationship and models are as Figure 2 shown.

[0035] The half-bridge switching unit 16 receives DC power supply provided by the front-stage DC power supply module 2. At the same time, the half-bridge switching unit 16 is controlled by the PWM controller 17, and realizes switching actions in an orderly manner according to a specific on-off logic, and outputs a high-frequency AC signal. The voltage transformation unit 18 mainly includes a high-frequency transformer. The high-frequency transformer transforms the regulated high-frequency signal. The resonant unit 19 improves the resonant waveform of the high-frequency signal output by the voltage transformation unit 18. The output of the resonant unit 19 is supplied to the cold plasma jet head 11 through the cold plasma jet output interface 4.

[0036] The PWM controller 17 can be located inside the cold plasma jet control panel 10, and the PWM controller 17 of the cold plasma jet control panel 10 is controlled by the main control module 7.

[0037] In the cold plasma jet treatment system of the present utility model, a parallel resonant capacitor is added behind the voltage transformation unit, which is connected in parallel with the leakage inductance of the voltage transformation unit to form an LC resonant circuit for resonance point matching to improve the resonant waveform of the high-frequency signal output by the voltage transformation unit, making it a standard sine wave. Even when the voltage increases, the jet is more uniform and stable, achieving basically no electric shock sensation and a lower jet temperature.

[0038] The aforementioned DC power supply module 2 can include a power switch 12, a first filtering unit 13, a full-bridge rectifying unit 14, and a second filtering unit 15. The first filtering unit 13 is connected to the AC mains interface 1. The power switch 12 is arranged between the first filtering unit 13 and the AC mains interface 1. The full-bridge rectifying unit 14 is connected to the output of the first filtering unit 13. The second filtering unit 15 is connected to the output of the full-bridge rectifying unit 14. The output of the second filtering unit 15 is connected to the half-bridge switching unit 16.

[0039] The first filtering unit 13 can be a common-mode inductor, and its inductance value is 16.4 mH, as Figure 2 shown.

[0040] The second filtering unit 15 can be a filtering capacitor, and its model is as Figure 2 shown.

[0041] The DC power supply module 2 controls the on / off through the power switch 12, and then reaches the first filtering unit 13. The first filtering unit 13 is equivalent to an EMI filter, enhancing the anti-interference ability of the power supply. Then it is given to the full-bridge rectification unit 14, which includes diodes D1, D2, D3, and D4, and their connection relationship and models are as Figure 2 shown. Finally, after rectification and filtering by the second filtering unit 15, the DC becomes more stable, and the second filtering unit 15 outputs the DC to the half-bridge switching unit 16 of the cold plasma jet power supply module 3.

[0042] As an improvement of the embodiment of the present utility model, the main control module 7 is connected to the cold plasma jet control panel 10, and the cold plasma jet control panel 10 is connected to the cold plasma jet power supply module 3. The main control module 7 can also be connected to the display module 6 and the control switch 8. After the main control module 7 works, it adjusts the air flow control module 9 and the cold plasma jet control panel 10 according to the control instructions of the display module 6 and the control switch 8, thereby controlling the working state of the cold plasma jet power supply module 4, and finally outputting energy to the cold plasma jet tool head 11.

[0043] The control switch 8 can be a foot switch, and the foot switch can include one or more feet, and the plasma jet power supply module 3 is started or stopped by stepping on the foot.

[0044] The foot switch 8 provides a switch quantity signal for sampling by the main control module 7. After the main control module 7 collects the status signal of the foot switch, it makes a judgment, and according to the program set by the software, it performs the set actions for specific states.

[0045] The frequency range of the cold plasma jet power supply module 3 is 5KHz - 30KHz, with a sine wave output, and the voltage peak value is 3 - 12kV. Its power adjustment has 10 gears, and the gear adjustment is realized through the main control module 7. The main control module 7 provides control signals for 10 gears respectively, and this signal corresponds to the output power.

[0046] The setting of the gear can be carried out through the display module 6. The display module 6 adopts a touch screen form, and the display interface can be used as an input adjustment interface.

[0047] When adjusted to a certain gear, the main control module 7 generates a control signal corresponding to the gear, provides this control signal to the cold plasma jet control panel 10, and the cold plasma jet control panel 10 generates a PWM wave to control the output of the plasma jet power supply module 3.

[0048] The control signal is a voltage signal, generally 0 - 5V. The change of this control signal can change the duty cycle of the PWM wave, thereby changing the output of the plasma jet power supply module 3. The main control module 7 receives the gear signal and sends it to the single-chip microcomputer on the main control module 7. The single-chip microcomputer gives different signals of 0 - 5V to the generation circuit according to the internally burned program, so as to generate different control signals.

[0049] The main control module 7 of the present utility model and its attached modules can be powered by an additional power supply, or the AC mains power of the AC mains interface 1 can be used to supply power to the main control module 7 through the auxiliary circuit module 5. At this time, the AC mains interface 1 is connected to the auxiliary circuit module 5, and the auxiliary circuit module 5 is connected to the main control module 7. The AC mains interface 1 receives single-phase 220V AC mains power and provides it to the auxiliary circuit module 5. The auxiliary circuit module 5 converts the 220V AC mains power into auxiliary power and provides it to the main control module 7.

[0050] The main control module 7 is built-in with an upgradable software program. By modifying the settings on the display module 6, it is possible to achieve programming adjustment of the functions of the above various interfaces.

[0051] The above is the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A cold plasma jet treatment system, characterized in that, It includes an AC mains interface, a DC power module, a cold plasma jet power module, a cold plasma jet output interface, a main control module and an air flow control module, where: The AC mains interface, the DC power module, the cold plasma jet power module and the cold plasma jet output interface are connected in sequence, and the main control module is respectively connected to the air flow control module and the cold plasma jet power module; The cold plasma jet power module includes a half-bridge switch unit, a transformer unit and a resonance unit. The half-bridge switch unit is connected to the output of the DC power module, the transformer unit is connected to the output of the half-bridge switch unit, the resonance unit is connected to the output of the transformer unit, and the half-bridge switch unit is connected to a PWM controller for controlling the half-bridge switch unit; The resonance unit includes a resonance capacitor. The resonance capacitor is connected in parallel with the output end of the transformer unit, and the resonance capacitor and the leakage inductance of the transformer unit are connected in parallel to form an LC resonance circuit.

2. The cold plasma jet treatment system according to claim 1, wherein The DC power module includes a power switch, a first filter unit, a full-bridge rectifier unit and a second filter unit. The first filter unit is connected to the AC mains interface, the power switch is arranged between the first filter unit and the AC mains interface, the full-bridge rectifier unit is connected to the output of the first filter unit, the second filter unit is connected to the output of the full-bridge rectifier unit, and the output of the second filter unit is connected to the half-bridge switch unit.

3. The cold plasma jet treatment system according to claim 2, characterized in that, The main control module is connected to a cold plasma jet control panel, and the cold plasma jet control panel is connected to the cold plasma jet power module.

4. The cold plasma jet treatment system according to claim 3, characterized in that, The main control module is connected to a control switch and a display module.

5. The cold plasma jet treatment system according to claim 4, characterized in that, The control switch is a foot switch, and the foot switch includes a foot button.

6. The cold plasma jet treatment system according to claim 4, characterized in that, The AC mains interface is connected to an auxiliary circuit module, and the auxiliary circuit module is connected to the main control module.

7. The cold plasma jet treatment system according to any one of claims 1-6, characterized in that, The capacitance of the resonance capacitor is 20 nF, and the magnitude of the leakage inductance of the transformer unit is 490 mH.

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