Double-cavity jet plasma knife

Abstract

The invention discloses a double-cavity jet plasma knife, which belongs to the field of medical surgical instruments and comprises a sleeve connector, an inner sleeve, an outer sleeve and other structures, an inner cavity is used for jet flow of plasma, the diameter of an outer cavity is 4mm larger than that of the inner cavity, and the outer cavity is used for emptying waste gas, waste liquid and tissue residues. During working, the length of the outer cavity can be adjusted between the upper limiter and the lower limiter so as to ensure that the outer cavity is always attached to a tissue wound surface, the air entrainment effect is avoided, and the purpose of accurately regulating and controlling active particles is achieved; meanwhile, a side hole in the tail end of the outer cavity is connected with a medical negative pressure aspirator, waste gas obtained after active particles are treated is emptied without damaging brain tissue under the extremely small negative pressure in the working mode, and waste gas, waste liquid and tissue residues generated in the operation can be drained in time under the suction mode. The definition of the surgical field is improved, meanwhile, the influence of waste gas, waste liquid and tissue residues on the action effect of the active particles is avoided, the regulation and control accuracy of the active particles is further improved, and the safety and high efficiency of the surgery are guaranteed.

Description

Technical Field

[0001] The invention relates to the field of medical surgical instruments, in particular to a double-cavity jet plasma knife. Background Art

[0002] Organisms produce various free radicals in normal metabolic activities. These free radicals will participate in the redox reaction of organisms and biological processes such as cellular immune response, cell cycle control, cell differentiation and apoptosis. Plasma jets can produce various free radicals, charged particles, ultraviolet rays, excited particles, etc., which act on organisms at the molecular level. Some of them are even the same as the free radicals produced by organisms, such as NO, OH, etc. These free radicals can also participate in the physiological processes of organisms. By regulating the dose of free radicals produced by jet plasma, it is possible to regulate the physiological processes of organisms. Among many plasma sources, atmospheric pressure non-equilibrium plasma jets have the advantages of no need for vacuum system and low and uniform plasma temperature, and can be widely used in the medical field. In root canal treatment of teeth, atmospheric pressure plasma jets can fully destroy bacterial biofilms in the oral cavity, thereby achieving better sterilization effects. In the treatment of refractory skin wounds, jet plasma can eliminate refractory bacteria in the wound, promote fibroblast proliferation, and achieve good wound treatment effects. In the field of tumor treatment, low-dose plasma jets have a good apoptosis-promoting effect on skin cancer cells.

[0003] In the treatment of glioma, the active particles generated by low-temperature plasma jets have the effect of efficiently and selectively killing glioma cells at a certain dose. A large dose can cause damage to normal brain tissue cells, and a small dose has a poor killing effect on tumor cells. At the same time, brain tissue is prone to cerebral edema after being affected by chemical factors, which endangers the patient's life safety. Therefore, precise control of the active particle dose during surgery is crucial for killing glioma cells and protecting normal brain tissue. However, the existing plasma jet cutter heads are mostly composed of single-cavity medium tubes made of quartz, alumina, magnesium fluoride and other materials. There is no barrier with the surrounding air during operation. During the jet process, the surrounding air entrainment effect will be formed. The amount of entrained air is related to the flow state of the jet plasma, the temperature and humidity of the ambient air, and the length of the jet. Objectively, there is an uncertain and unstable problem of air content in the jet plasma, which affects the precise regulation of the active particle content in the plasma, thereby making the treatment effect difficult to control. In addition, bleeding from the surgical wound, residual saline and tissue residues in the surgical cavity affect the contact between the active particles and the tumor tissue, and also affect the regulation of the active particles. Therefore, the current plasma jet knife is not suitable for use in clinical neurosurgery due to the imprecise regulation of active particles. Summary of the invention

[0004] Technical solution of the present invention: In view of the defect that the existing plasma knife cannot achieve precise control during cranial surgery, the present invention provides a double-cavity jet plasma knife, which solves the problems of air entrainment generated by the existing plasma knife when used during surgery, the inability of the knife head to fit tightly with the tumor wound surface, and the inability to discharge waste gas and waste liquid, which affect the precise control of active particles. The present invention concentrates the power supply and working gas at the end of the plasma knife for feeding, and designs two coaxial inner and outer chambers, the diameter of the outer cavity is 4mm larger than that of the inner cavity; the inner cavity sleeve is embedded in the sleeve connector at the tail, and the outer cavity sleeve is connected to the sleeve connector. A limiter is provided on the surface of the sleeve connector, and the working length of the outer cavity sleeve can be freely adjusted within the range of the limiter. Therefore, it is ensured that the outer cavity sleeve always covers the surface of the brain tissue to be treated during operation, effectively avoiding the entrainment effect of plasma on the surrounding air, and improving the accuracy of the control of active particles in the plasma.

[0005] At the same time, a side hole with a diameter of 4mm is opened at the tail end of the external cavity to connect a medical negative pressure aspirator, and the negative pressure can be adjusted between -20mmHg and -200mmHg. In the working mode, the negative pressure regulator is at the minimum and the negative pressure cannot be increased to avoid large negative pressure damaging the brain tissue. The plasma knife can also be adjusted from the working mode to the suction mode according to the needs during the operation, thereby increasing the negative pressure and quickly discharging waste gas, waste liquid and tissue residues, thereby avoiding the influence of blood, saline, tissue residues, etc. on the surgical wound on the active particles, further increasing the accuracy of active particle regulation.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A double-cavity jet plasma knife comprises 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 at 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 source via a power line, and the sleeve connector is connected to the working gas via an air inlet pipe;

[0010] The side wall of the external sleeve is provided with a side hole, the side hole of the external sleeve is connected to a waste liquid tank through a suction tube, a negative pressure regulating valve is provided on the suction tube, and 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, and the limiter is used to limit the upward and downward movement of the external 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 arranged at the upper part of the sleeve connector. The diameter of the upper limiter is larger than that of the external sleeve. When the external sleeve moves up to the limit position, it presses on the upper limiter; the lower limiter is arranged at the lower part of the sleeve connector. The inner wall of the external sleeve is provided with a groove matching the lower limiter. When the external sleeve moves down to the limit position, the lower limiter presses 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 arranged on the outer wall of the outer sleeve, and the mode switching switch is communicatively connected with the negative pressure regulating valve for controlling the opening and closing of the negative pressure regulating valve.

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

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

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

[0018] Beneficial effects:

[0019] The present invention adopts a double-cavity jet plasma knife, which adjusts the length of the outer cavity sleeve during operation to keep the outer cavity close to the tissue wound surface, thereby avoiding the air suction effect during the jet, improving the utilization efficiency of active particles, and making the regulation of the active particle content in the plasma more precise; at the same time, the negative pressure aspirator connected to the tail end of the outer cavity has a small negative pressure in the working mode, thereby avoiding mechanical damage to the brain tissue. In the suction mode, the negative pressure can be adjusted to a maximum of -200 mmHg, which is conducive to emptying the waste gas, waste liquid and tissue residues generated during the operation, ensuring the clarity of the surgical field of view, reducing the interference of residual waste gas, waste liquid and tissue residues on the plasma, improving the treatment effect of the plasma knife, and also improving the accuracy of active particle regulation from another perspective. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the 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 external sleeve, 4 is the internal 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 ground 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 limiter, and 19 is the lower limiter. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. However, the following embodiments are limited to explaining the present invention, and the protection scope of the present invention should include the entire contents of the claims, and through the description of the following embodiments, those skilled in the art can fully implement the entire contents of the claims of the present invention.

[0023] Example

[0024] like Figure 1 As shown, a dual-cavity jet plasma knife of the present invention comprises a power supply 1, a ground wire 12, a power wire 14, a working gas 10, an air inlet pipe 13, a sleeve connector 2, an upper limiter 18, a lower limiter 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 external sleeve 3, an internal sleeve 4, an outer cavity 6, an inner cavity 5 and a plasma 7. The inner cavity of the plasma knife is used for the jet of plasma. The diameter of the outer cavity is 4 mm larger than that of the inner cavity and is used for emptying waste gas, waste liquid and tissue residues. During operation, the length of the outer cavity can be adjusted between the upper and lower limiters to ensure that the outer cavity is always attached to the tissue wound surface, avoiding the air suction effect and achieving the purpose of accurately regulating 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 aspirator, and the waste gas treated by the active particles is discharged under extremely small negative pressure in the working mode without damaging the brain tissue, while in the suction mode, the waste gas, waste liquid and tissue residues generated during the operation can be drained in time, which improves the clarity of the surgical field while avoiding the influence of waste gas, waste liquid and tissue residues on the effect of the active particles, further improving the accuracy of the regulation of the active particles and ensuring the safety and efficiency of the operation.

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

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

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

[0028] When working, the dual-cavity jet plasma tool 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 maintains the lowest negative pressure to allow the waste gas after the jet to flow out and avoid damaging the brain tissue; in the suction mode, the negative pressure regulating valve can adjust the negative pressure according to the discharge of waste gas, waste liquid and tissue residues, avoid the influence of waste gas, waste liquid and tissue residues on active particles, and further improve the accuracy of the action of active particles.

[0029] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A double-cavity jet plasma knife, characterized in that: including a sleeve connector, an inner sleeve and an outer sleeve; The outer sleeve and the inner sleeve are coaxially arranged, the outer sleeve is located at 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 source via a power line, and the sleeve connector is connected to the working gas via an air inlet pipe; The side wall of the external sleeve is provided with a side hole, the side hole of the external sleeve is connected to a waste liquid tank through a suction tube, a negative pressure regulating valve is provided on the suction tube, and the waste liquid tank is connected to a negative pressure pump through a negative pressure pipeline.

2. A double-cavity jet plasma knife according to claim 1, characterized in that: The sleeve connector is provided with a limiter, and the limiter is used to limit the upward and downward movement of the external sleeve along the axial direction.

3. A double-cavity jet plasma knife according to claim 1, characterized in that: The limiter includes an upper limiter and a lower limiter. The upper limiter is arranged at the upper part of the sleeve connector, and the diameter of the upper limiter is larger than the external sleeve; the lower limiter is arranged at the lower part of the sleeve connector, and the inner wall of the external sleeve is provided with a slot matching the lower limiter.

4. A double-cavity jet plasma knife according to claim 1, characterized in that: The power source is grounded via a ground wire.

5. The double-cavity jet plasma knife according to claim 1, characterized in that: A mode switching switch is arranged on the outer wall of the external sleeve, and the mode switching switch is communicatively connected with the negative pressure regulating valve for controlling the opening and closing of the negative pressure regulating valve.

6. The double-cavity jet plasma knife according to claim 1, characterized in that: The diameter of the outer sleeve is 4 mm larger than the diameter of the inner sleeve.

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

8. The double-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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