Dual chamber fluidic plasma knife

Abstract

The application discloses a double-cavity jet flow plasma knife and belongs to the field of medical operation instruments, which comprises a sleeve connector, an inner sleeve and an outer sleeve and the like structures, an inner cavity is used for jet flow of plasma, and the outer cavity is 4mm larger in diameter than the inner cavity and is used for evacuation of waste gas, waste liquid and tissue residues. When working, the length of the outer cavity can be adjusted between upper and lower limiters to ensure that the outer cavity is always attached to a tissue wound surface, so that air entrainment effect is avoided and the purpose of accurate regulation of active particles is achieved. Meanwhile, a lateral hole at the tail end of the outer cavity is connected with a medical negative pressure aspirator. When working in a mode of very small negative pressure, waste gas after treatment of active particles is evacuated without damaging brain tissue, and when working in a suction mode, waste gas, waste liquid and tissue residues generated in the operation can be drained in time, so that the operation field clarity is improved, the influence of waste gas, waste liquid and tissue residues on the effect of active particles is avoided, the accuracy of regulation of active particles is further improved, and the safety and efficiency of the operation are ensured.

Description

Technical Field

[0001] This invention relates to the field of medical surgical instruments, specifically a dual-cavity jet plasma scalpel. Background Technology

[0002] During normal metabolic activities, organisms generate various free radicals, which participate in redox reactions, cellular immune responses, cell cycle control, cell differentiation, and apoptosis. Plasma jets can generate various free radicals, charged particles, ultraviolet light, and excited-state particles, which act on organisms at the molecular level. Some of these particles are even identical to the free radicals produced by organisms, such as NO and OH, and these free radicals can also participate in physiological processes. By controlling the dosage of free radicals generated by the plasma jet, physiological processes can be regulated. Among various plasma sources, atmospheric pressure non-equilibrium plasma jets have advantages such as not requiring a vacuum system and generating low and uniform plasma temperatures, making them widely applicable in the medical field. In dental root canal treatment, atmospheric pressure plasma jets can effectively destroy bacterial biofilms in the oral cavity, achieving better bactericidal effects. In the treatment of refractory skin wounds, plasma jets can eliminate refractory bacteria in the wound and promote fibroblast proliferation, achieving good wound healing results. In the field of tumor treatment, low-dose plasma jets have a good pro-apoptotic effect on skin cancer cells.

[0003] In the treatment of gliomas, the active particles generated by low-temperature plasma jets can effectively and selectively kill glioma cells at certain doses. Larger doses can damage normal brain tissue cells, while smaller doses have a poor killing effect on tumor cells. Simultaneously, brain tissue is prone to cerebral edema after exposure to physical and chemical factors, endangering the patient's life. Therefore, precise control of the active particle dosage during surgery is crucial for killing glioma cells and protecting normal brain tissue. However, existing plasma jet cutting heads are mostly composed of single-lumen dielectric tubes made of materials such as quartz, alumina, and magnesium fluoride. During operation, there is no barrier between the plasma and the surrounding air, leading to an entrainment effect of surrounding air during the jet process. The amount of entrained air is related to the flow state of the plasma jet, the temperature and humidity of the ambient air, and the length of the jet. Objectively, there is an uncertainty and instability in the air content of the plasma jet, affecting the precise control of the active particle content and making it difficult to control the treatment effect. Furthermore, surgical wound bleeding, residual saline and tissue debris in the surgical cavity affect the contact between active particles and tumor tissue, also affecting the control of active particle concentration. Therefore, current plasma jet scalpels are not suitable for use in clinical neurosurgery due to their imprecise control of active particles. Summary of the Invention

[0004] The technical solution of this invention addresses the shortcomings of existing plasma scalpels in achieving precise control during craniocerebral surgery. This invention provides a dual-cavity jet plasma scalpel, resolving issues such as air entrainment, the inability of the scalpel tip to closely adhere to the tumor wound, and the inability to expel waste gas and fluid, all of which affect the precise control of active particles. This invention concentrates the power supply and working gas at the tip of the plasma scalpel and designs two coaxial chambers, with the outer chamber having a diameter 4mm larger than the inner chamber. The inner chamber sleeve is embedded in a sleeve connector at the tail, and the outer chamber sleeve is connected to the sleeve connector. A limiter is provided on the surface of the sleeve connector, allowing the working length of the outer chamber sleeve to be freely adjusted within the limiter's range. Therefore, it ensures that the outer chamber sleeve always covers the surface of the brain tissue to be treated during operation, effectively avoiding the entrainment effect of plasma on surrounding air and improving the precision of active particle control within the plasma.

[0005] Meanwhile, a 4mm diameter side hole is opened at the tail end of the external cavity to connect to a medical negative pressure suction device. The negative pressure can be adjusted between -20mmHg and -200mmHg. In the working mode, the negative pressure regulator is at its minimum and cannot be increased to avoid damage to brain tissue from excessive negative pressure. The plasma knife can also be switched from the working mode to the suction mode as needed during the operation, thereby increasing the negative pressure and quickly expelling waste gas, waste liquid, and tissue residue. This avoids the influence of blood, saline, and tissue residue on the active particles from the surgical wound, further increasing the precision of active particle control.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A dual-cavity jet plasma knife includes a sleeve connector, an inner sleeve, and an outer sleeve;

[0008] The outer sleeve and the inner sleeve are coaxially arranged, the outer sleeve is located on the outer periphery of the inner sleeve, the upper end of the inner sleeve is fixedly connected to the sleeve connector, and the upper part of the outer sleeve is slidably connected to the sleeve connector.

[0009] The sleeve connector is connected to the power supply via a power cord, and the sleeve connector is connected to the working gas via an air inlet pipe;

[0010] The outer sleeve has a side hole on its side wall. A waste liquid tank is connected to the side hole of the outer sleeve through a suction pipe. A negative pressure regulating valve is installed on the suction pipe. The waste liquid tank is connected to a negative pressure pump through a negative pressure pipeline.

[0011] In the above technical solution, a limiter is provided on the sleeve connector, which is used to limit the up and down movement of the outer sleeve along the axial direction.

[0012] In the above technical solution, the limiter includes an upper limiter and a lower limiter. The upper limiter is disposed on the upper part of the sleeve connector, and the diameter of the upper limiter is larger than that of the outer sleeve. When the outer sleeve moves upward to the limit position, it rests on the upper limiter. The lower limiter is disposed on the lower part of the sleeve connector, and the inner wall of the outer sleeve is provided with a groove that matches the lower limiter. When the outer sleeve moves downward to the limit position, the lower limiter rests on the groove.

[0013] In the above technical solution, the power supply is grounded through a grounding wire.

[0014] In the above technical solution, a mode switching switch is provided on the outer wall of the outer sleeve. The mode switching switch is communicatively connected to the negative pressure regulating valve and is used to control the opening and closing of the negative pressure regulating valve.

[0015] In the above technical solution, the diameter of the outer sleeve is 4mm larger than the diameter of the inner sleeve.

[0016] In the above technical solution, both the outer sleeve and the inner sleeve are made of quartz.

[0017] In the above technical solution, the adjustment range of the negative pressure regulating valve is -20mmHg to -200mmHg.

[0018] Beneficial effects:

[0019] This invention employs a dual-cavity jet plasma scalpel. During operation, by adjusting the length of the outer cavity cannula, the outer cavity is kept in close contact with the tissue wound, avoiding the air entrainment effect during jetting, improving the utilization efficiency of active particles, and allowing for more precise control of the active particle content in the plasma. Simultaneously, the negative pressure suction device connected to the tail end of the outer cavity maintains a low negative pressure in operating mode, avoiding mechanical damage to brain tissue. In suction mode, the negative pressure can be adjusted up to -200 mmHg, which facilitates the removal of waste gas, waste fluid, and tissue residue generated during surgery, ensuring a clear surgical field, reducing interference from residual waste gas, waste fluid, and tissue residue on the plasma, improving the therapeutic effect of the plasma scalpel, and also enhancing the precision of active particle control from another perspective. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the device structure of a dual-cavity plasma knife according to the present invention.

[0021] Among them, 1 is the power supply, 2 is the sleeve connector, 3 is the outer sleeve, 4 is the inner sleeve, 5 is the inner cavity, 6 is the outer cavity, 7 is the plasma, 8 is the negative pressure regulating valve, 9 is the waste liquid tank, 10 is the working gas, 11 is the mode switching switch, 12 is the grounding wire, 13 is the air inlet pipe, 14 is the power cord, 15 is the negative pressure pump, 16 is the suction tube, 17 is the negative pressure pipeline, 18 is the upper limit switch, and 19 is the lower limit switch. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. However, the following embodiments are only for explaining the present invention, and the scope of protection of the present invention should include all the contents of the claims. Moreover, through the description of the following embodiments, those skilled in the art can fully implement all the contents of the claims of the present invention.

[0023] Example

[0024] like Figure 1 As shown, a dual-cavity jet plasma scalpel of the present invention includes a power supply 1, a grounding wire 12, a power cord 14, a working gas 10, an air inlet pipe 13, a sleeve connector 2, an upper limit switch 18, a lower limit switch 19, a mode switching switch 11, a negative pressure regulating valve 8, a suction tube 16, a waste liquid tank 9, a negative pressure pipeline 17, a negative pressure pump 15, an outer sleeve 3, an inner sleeve 4, an outer cavity 6, an inner cavity 5, and a plasma 7. The inner cavity of the plasma scalpel is used for the jetting of plasma, and the outer cavity has a diameter 4 mm larger than the inner cavity for the discharge of waste gas, waste liquid, and tissue residue. During operation, the length of the outer cavity can be adjusted between the upper and lower limiters to ensure that the outer cavity always adheres to the tissue wound surface, avoiding the air entrainment effect and achieving precise control of the active particles. At the same time, the side hole at the tail end of the outer cavity is connected to a medical negative pressure suction device. In the working mode, the waste gas after the active particles are processed is discharged without damaging the brain tissue when the negative pressure is extremely small. In the suction mode, the waste gas, waste fluid and tissue residue generated during the operation can be drained in time, which improves the clarity of the surgical field and avoids the influence of waste gas, waste fluid and tissue residue on the effect of the active particles. This further improves the precision of the control of active particles and ensures the safety and efficiency of the operation.

[0025] In this embodiment, the power supply and working gas of the dual-cavity jet plasma knife are concentrated in the inner cavity at the end. The inner cavity is embedded in the tail-end limiting sleeve connector, and the outer cavity is sleeved outside the sleeve connector. The sleeves are all made of quartz.

[0026] In this embodiment, the dual-cavity jet plasma scalpel has a limiter on its inner cavity, and the outer cavity diameter is 4mm larger than the inner cavity. The length of the outer cavity can be adjusted within the range of the limiter so that the outer cavity can always be attached to the tissue wound when the plasma scalpel is working, avoiding the entrainment of external air during the jet process and improving the accuracy of active particle control.

[0027] In this embodiment, the dual-cavity jet plasma knife has a 4mm side hole at the tail end of its outer cavity, which is connected to a waste liquid tank through a negative pressure regulating valve. The waste liquid tank is connected to a negative pressure pump through a negative pressure pipeline. The overall negative pressure regulation range of the negative pressure system is -20mmHg to -200mmHg.

[0028] During operation, the dual-cavity jet plasma cutter has two modes, which can be controlled by a mode switching switch. In the working mode, the negative pressure regulating valve is not adjustable and is kept at the lowest negative pressure to ensure that the waste gas after jetting is emptied and to avoid damage to brain tissue. In the suction mode, the negative pressure regulating valve can adjust the negative pressure according to the emptying of waste gas, waste liquid and tissue residue, to avoid the influence of waste gas, waste liquid and tissue residue on active particles, and further improve the accuracy of active particle action.

[0029] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A dual-cavity jet plasma knife, characterized in that: Includes sleeve connectors, inner sleeves, and outer sleeves; The outer sleeve and the inner sleeve are coaxially arranged, the outer sleeve is located on the outer periphery of the inner sleeve, the upper end of the inner sleeve is fixedly connected to the sleeve connector, and the upper part of the outer sleeve is slidably connected to the sleeve connector. The sleeve connector is connected to the power supply via a power cord, and the sleeve connector is connected to the working gas via an air inlet pipe; The outer sleeve has a side hole on its side wall. The side hole of the outer sleeve is connected to a waste liquid tank through a suction pipe. The suction pipe is equipped with a negative pressure regulating valve. The waste liquid tank is connected to a negative pressure pump through a negative pressure pipeline. A mode switching switch is provided on the outer wall of the outer sleeve. The mode switching switch is communicatively connected to the negative pressure regulating valve and is used to control the opening and closing of the negative pressure regulating valve. The diameter of the outer sleeve is 4 mm larger than the diameter of the inner sleeve; The sleeve connector is provided with a limiter, which is used to limit the up and down movement of the outer sleeve along the axial direction. The limiter includes an upper limiter and a lower limiter. The upper limiter is disposed on the upper part of the sleeve connector, and the diameter of the upper limiter is larger than that of the outer sleeve. The lower limiter is disposed on the lower part of the sleeve connector, and the inner wall of the outer sleeve is provided with a groove that matches the lower limiter. The dual-cavity jet plasma cutter has two modes: a working mode and an attraction mode. In the working mode, the negative pressure regulating valve is not adjustable and is kept at the lowest negative pressure to ensure that the waste gas after jetting is emptied and to avoid damage to brain tissue. In the attraction mode, the negative pressure regulating valve can adjust the negative pressure according to the emptying of waste gas, waste liquid and tissue residue to avoid the influence of waste gas, waste liquid and tissue residue on active particles.

2. The dual-cavity jet plasma knife according to claim 1, characterized in that: The power supply is grounded via a grounding wire.

3. The dual-cavity jet plasma knife according to claim 1, characterized in that: Both the outer sleeve and the inner sleeve are made of quartz.

4. The dual-cavity jet plasma knife according to claim 1, characterized in that: The adjustment range of the negative pressure regulating valve is -20 mmHg to -200 mmHg.

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