High-frequency electrotome gas mass flow control system

Abstract

The utility model relates to a high-frequency electrotome gas mass flow control system which comprises a gas channel, and a pressure sensor, an electromagnetic valve and a mass flow controller are sequentially installed on the gas channel. The mass flow controller comprises a temperature sensor, a volume flow sensor, an electromagnetic valve and a controller, and the mass flow controller controls the mass flow of the gas according to the monitored gas temperature and volume flow. The mass flow controller on the gas passage is used for monitoring the volume flow and temperature of the gas in real time and adjusting the mass flow of the gas, so that the mass flow control of the gas is more accurate and more stable when the high-frequency electrotome is used for an operation.

Description

Technical Field

[0001] The utility model relates to a stable, reliable and high-precision gas mass flow control system, belonging to the technical field of medical equipment. Background Art

[0002] The argon controller uses the high-frequency energy generated by the high-frequency electric knife to be fully ionized into argon ions with good conductivity through the tungsten steel leaf electrode, producing an argon arc with uniform distribution and extremely high density. Compared with general high-frequency electric knives, the eschar produced by the argon electric knife is uniform and smooth, with a thickness of only 1 / 3-1 / 5 of that of general electric knives, which can reduce blood loss by 50% and shorten the operation time. It has the outstanding advantages of fast hemostasis, low degree of tissue carbonization, small tissue damage, and short postoperative healing time.

[0003] High-frequency surgical systems are widely used in the clinical medical field because of their advantages over traditional surgical instruments. During surgery, how to perform high-precision and stable argon flow control is an important difficulty in clinical applications. The control of argon is reflected in the following aspects:

[0004] 1. Gas supply: When performing a long operation, a single gas source may not be able to meet the needs of the operation.

[0005] 2. Flow control: For specific application scenarios, the required mass flow rate of argon is different. When adjusting the argon, whether the corresponding flow rate can be generated stably and accurately is also the key and difficulty.

[0006] Taking the above aspects into consideration, a stable, reliable and high-precision gas mass flow control system was designed to solve the problem of argon gas flow control during argon electrosurgical surgery. Summary of the invention

[0007] The utility model aims to provide a stable, reliable and high-precision gas mass flow control system to solve the problem of unstable argon gas flow during argon electrosurgical surgery.

[0008] To achieve the above object, the technical solution provided by the present invention is a high-frequency electrosurgical gas mass flow control system, comprising a gas passage, on which a pressure sensor, a solenoid valve and a mass flow controller are sequentially installed;

[0009] The mass flow controller comprises a temperature sensor, a volume flow sensor, a solenoid valve and a controller. The mass flow controller controls the mass flow of the gas according to the monitored gas temperature and volume flow.

[0010] Furthermore, there are at least a plurality of gas passages, and when the gas source pressure of the first gas passage drops to a set threshold, the control system immediately switches to other gas sources.

[0011] Furthermore, the gas passage is provided with a one-way valve to prevent gas backflow.

[0012] Furthermore, the gas passage is provided with a safety valve.

[0013] The technical effect of the first technical solution of the present invention is: using the mass flow controller on the gas passage to monitor the volume flow and temperature of the gas in real time, and adjust the mass flow of the gas, so that the mass flow control of the gas is more accurate and stable when the high-frequency electric knife is performing surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a block diagram of the composition of the high-frequency electric knife gas mass flow control system.

[0015] Figure 2 The utility model is a block diagram of the gas mass flow controller of the high-frequency electric knife gas mass flow control system.

[0016] 1-gas source, 2-pressure reducing valve, 3-safety valve, 4-pressure sensor, 5-solenoid valve, 6-check valve, 7-mass flow controller, 8-gas passage, 71-temperature sensor, 72-volume flow sensor, 73-proportional control valve, 74-controller. DETAILED DESCRIPTION

[0017] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. Example

[0018] The present invention designs a simple, reliable and high-precision gas flow control system, such as Figure 1 and Figure 2 As shown, it mainly includes a gas passage 8, on which a pressure sensor 4, a solenoid valve 5 and a mass flow controller 7 are installed in sequence; the mass flow controller 7 includes a temperature sensor 71, a volume flow sensor 72, a proportional control valve 73 and a controller 74, and the mass flow controller 7 controls the mass flow of the gas according to the monitored gas temperature and volume flow. There are at least multiple gas passages 8, and when the pressure of the gas source 1 of the first gas passage drops to a set threshold, the control system immediately switches to other gas sources.

[0019] Optionally, a one-way valve 6 is further provided on the gas passage of the present invention to prevent gas backflow.

[0020] Optionally, a pressure reducing valve 2 is further provided on the gas passage of the present invention to reduce the gas pressure on the gas passage 8 .

[0021] Optionally, a safety valve 3 is also provided on the gas passage of the present invention.

[0022] The present invention has at least a plurality of gas passages, and when the pressure of the gas source 1 of the first gas passage drops to a set threshold, the control system immediately switches to other gas sources. For the convenience of describing the present invention, two gas passages are used as an example.

[0023] The two gas passages in the present invention can automatically / manually switch the gas cylinder to ensure the supply of gas source. The external communication port selects the appropriate mode according to the application scenario. The gas passage is equipped with a pressure sensor and a mass flow controller. The control system monitors the gas flow and pressure in real time and controls the gas source switch and flow. Real-time continuous self-checking, timely sound and light prompts after a fault occurs, automatic shutdown, error report provision and automatic storage for fault analysis and process diagnosis.

[0024] The gas flow chart of the designed gas mass flow control system is as follows: Figure 1 As shown, a dual-channel gas source 1 input is designed, the gas flows through the pressure reducing valve 2, the overpressure is easy to adjust, and the pressure sensor 4 detects the gas pressure in real time. A solenoid valve 5 is set, and when the pressure of the gas source 1 is insufficient, the gas supply can be switched intelligently to effectively ensure the safety of the operation. After the two-channel gas source 1 is selected by the switch valve, it flows into the one-way valve 6, which effectively prevents the possibility of reverse flow of the gas. Then it passes through the mass flow controller 7, which communicates with the main control board using RS-485 communication to control the gas flow.

[0025] Figure 2 2 is a block diagram of a gas mass flow controller 2. The mass flow controller 2 includes a controller 74, a proportional control valve 73, two volume sensors 72, and two temperature sensors 71. Figure 2 As shown, the volume sensor 72 and the temperature sensor 71 measure the temperature and flow rate of the gas at the inlet and the temperature and flow rate at the outlet to calculate the mass flow rate; the parameters of the proportional control valve 73 are adjusted according to the size of the mass flow rate, so that the mass flow rate of the gas can be controlled.

[0026] The mass flow controller 7 uses RS-485 communication, which is high-speed, stable and not easily interfered with. The parameters are self-tuning, which can identify load changes and automatically adjust to the best PID control parameters. It can realize valve full open, valve full closed and valve automatic closed loop control functions. It can detect the standard temperature and flow channel temperature to calculate the gas mass / volume flow more accurately.

[0027] The control system's precise flow control can be adjusted step by step in the range of 0.1-2 liters, meeting the needs of various surgeries including digestive endoscopic surgery to the greatest extent; automatic electrode gas pressure control, independent air pressure regulation, and independent electronic air pressure control effectively avoid the dangers caused by improper argon control during digestive endoscopic surgery.

[0028] Finally, the flow rate can be adjusted within the range of 0.1L / min~12L / min.

[0029] Endoscopic mode, using a step size of 0.1 L / min in the range of 0-2 L / min;

[0030] Open mode, use a step size of 0.1L / min in the range of 0-1L / min;

[0031] Open mode, use a step size of 0.2L / min in the range of 1-2L / min;

[0032] Open mode, use a step size of 0.5L / min in the range of 2-5L / min;

[0033] Open mode, use steps of 1L / min in the range of 6-12L / min.

Claims

1. A high-frequency electrosurgical gas mass flow control system, characterized in that: Including gas passages, A pressure sensor, a solenoid valve and a mass flow controller are sequentially installed on the gas passage; The mass flow controller comprises a temperature sensor, a volume flow sensor, a solenoid valve and a controller. The mass flow controller controls the mass flow of the gas according to the monitored gas temperature and volume flow.

2. The high-frequency electrosurgical gas mass flow control system according to claim 1, characterized in that: There are at least a plurality of gas passages, and when the gas source pressure of the first gas passage drops to a set threshold, the control system immediately switches to other gas sources.

3. The high-frequency electrosurgical gas mass flow control system according to any one of claims 1 or 2, characterized in that: The gas passage is provided with a one-way valve to prevent gas backflow.

4. The high-frequency electrosurgical gas mass flow control system according to any one of claims 1 or 2, characterized in that: The gas passage is provided with a safety valve.

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