Bypass-type online oxygen concentration metering and detection device and detection method

Abstract

This invention discloses a bypass-type online oxygen concentration metering and detection device and method. The detection device comprises a housing; inside the housing are installed a constant pressure chamber, an oxygen concentration measuring component, a pressure measuring component, a first control valve, and a second control valve. The oxygen concentration measuring component, pressure measuring component, first control valve, and second control valve are all connected to the constant pressure chamber. The constant pressure chamber is connected to the main exhaust pipe of the ventilator, and a pump and a one-way valve are sequentially installed at the connection point. The pressure measuring component, pump, control valve, and cloud platform are all electrically connected to a computing control module. When performing pre-treatment of the constant pressure chamber for exhaust before detection, the pump and first control valve are open, and the second control valve is closed. When adjusting the constant pressure of the constant pressure chamber before detection, the pump and second control valve are open, and the first control valve is closed. This invention can improve the accuracy of oxygen concentration detection, achieve online detection, and eliminate the need for hospital equipment to be shut down for testing.

Description

Technical Field

[0001] This invention relates to the field of oxygen concentration monitoring in medical equipment, specifically a bypass-type online oxygen concentration metering and detection device and method. Background Technology

[0002] Oxygen is a fundamental element of human physiological metabolism. The brain, heart, lungs, and the blood that sustains them cannot function without oxygen. Moreover, the level of oxygen has a very direct and obvious impact on the human body. When the oxygen content is too low, the human body will experience hypoxia, which can be life-threatening in severe cases. Conversely, excessive oxygen content can also cause certain harm to the human body, and in severe cases, it can lead to "oxygen poisoning."

[0003] Medical oxygen is an essential component of patient treatment and a vital part of the hospital's life support system. Anesthesia machines, ventilators, and oxygen used in ICU wards have relatively strict requirements for oxygen concentration; therefore, oxygen concentration is a crucial parameter in the quality testing of ventilators and anesthesia machines. Due to the importance of oxygen to the human body, especially in emergency medical care, the precise measurement of medical oxygen concentration is of paramount importance. Currently, ventilators in hospitals must be decommissioned during the calibration process. Anesthesia machines and ventilators are extremely important and indispensable equipment for hospitals; disassembling and submitting such equipment for calibration is not permitted.

[0004] The existing technology has the following problems and drawbacks: First, ventilators are equipped with oxygen concentration sensors. According to metrological regulations, the oxygen concentration of ventilators needs to be tested annually, or metrology personnel need to bring an oxygen analyzer with a calibration certificate or an instrument with oxygen concentration measurement function to the hospital for testing. During the testing process, the hospital's ventilator equipment needs to be shut down. Existing detection methods require the operation time of important equipment such as ventilators and anesthesia machines, and the amount of data collected is relatively small, making it unsuitable for long-term monitoring. Second, changes in flow rate and pressure during the gas delivery process of ventilators and anesthesia machines can affect the accuracy of oxygen concentration detection. Therefore, this paper proposes a bypass-type online oxygen concentration metrology and detection device and method that improves the accuracy of oxygen concentration detection and does not require hospital equipment to be shut down for testing. Summary of the Invention

[0005] Purpose of the invention: To solve the above-mentioned technical problems, the present invention provides a bypass-type online oxygen concentration metering and detection device, wherein the detection device adopts a housing; the housing is equipped with a constant pressure chamber, an oxygen concentration measuring component, a pressure measuring component, a first control valve, and a second control valve; The oxygen concentration measuring component, pressure measuring component, first control valve, and second control valve are all connected to the constant pressure chamber; the constant pressure chamber is connected to the main air outlet pipe of the ventilator, and an air pump and a one-way valve are sequentially installed at the connection point. The pressure measuring component, air pump, control valve, and cloud platform are all electrically connected to the computing and control module; When the constant pressure chamber is pre-treated for exhaust before testing, the air pump and the first control valve are opened, and the second control valve is closed. When the constant pressure chamber is adjusted before testing, the air pump and the second control valve open or close according to the target pressure and the actual pressure value, while the first control valve closes.

[0006] Preferably, both the first control valve and the second control valve are solenoid valves.

[0007] Preferably, the pressure measuring component is a pressure sensor.

[0008] Preferably, the oxygen concentration measuring component is a paramagnetic oxygen sensor.

[0009] The output port diameter of the second control valve is much smaller than that of the first control valve.

[0010] A detection method based on the above-described bypass-type online oxygen concentration metering and detection device: The detection method includes the following steps: S1: A single detection command is sent to the computing control module via the cloud platform. Each time a detection is required, the computing control module receives the detection command and begins to preprocess the constant pressure chamber: the computing control module controls the air pump and the first control valve to open, the air pump starts pumping air, the computing control module calculates the air pump running time based on the volume of the constant pressure chamber, and the first control valve discharges the residual gas in the constant pressure chamber; after the calculated running time is completed, it is determined that the constant pressure chamber is full of the gas to be tested, and the first control valve is closed; S2: The air pump continuously pumps air, and opens or closes the second control valve to release a small amount of air into the constant pressure chamber. The air pump and the second control valve are used to regulate the gas pressure in the constant pressure chamber. The pressure value measured by the pressure sensor is transmitted to the data acquisition module, and then transmitted to the cloud platform through the calculation and control module for feedback within the constant pressure chamber. When the pressure value in the constant pressure chamber is stabilized and controlled at a fixed value, the air pump is turned off and the second control valve is closed. S3: The paramagnetic oxygen sensor detects the gas in the constant pressure chamber and transmits the signal to the computing and control module. The computing and control module feeds back the measured value to the cloud platform and the human-machine interaction module to realize online measurement. S4: The cloud platform sends a continuous detection command to the computing control module, repeating the above steps S1-S3. The oxygen concentration measuring component can measure the gas in the constant pressure chamber multiple times.

[0011] Preferably, in step S2, the one-way valve prevents gas in the constant pressure chamber from flowing into the main gas path.

[0012] Beneficial effects: 1. By setting a second solenoid valve and an air pump to compensate for the pressure in the constant pressure chamber, the pressure of the gas flowing out of the ventilator measured by the oxygen concentration measuring component is kept constant, avoiding inaccurate oxygen concentration detection due to pressure changes. Compared with the oxygen sensor inside the ventilator, the oxygen concentration detection accuracy is higher, which meets the requirements for oxygen concentration standard in the ventilator calibration procedure. 2. Before oxygen concentration detection, the residual gas in the constant pressure chamber from the previous test is removed through the first control valve to perform exhaust pretreatment on the constant pressure chamber, so as to avoid inaccurate samples and improve detection accuracy. 3. The one-way valve prevents gas in the constant pressure chamber from flowing into the main gas path, thus preventing the gas in the constant pressure chamber from affecting the main gas path; 4. With the external oxygen detection device, the online calibration device can be disassembled and sent for testing as a separate accessory without affecting the use of hospital equipment. Online testing saves hospital equipment downtime for testing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation of the detection device of the present invention; Figure 2 This is a schematic diagram of the internal structure of the detection device of the present invention; Figure 3 This is a schematic diagram of the operation control module in this invention; Figure 4 This is a schematic diagram of the internal structure of the detection device in this invention.

[0014] In the diagram, 1-shell, 101-inlet, 102-outlet, 2-one-way valve, 3-air pump, 4-constant pressure chamber, 5-first control valve, 6-oxygen concentration measuring component, 7-pressure sensor, 8-pipeline, 9-second control valve, 91-thin tube. Detailed Implementation

[0015] The following is in conjunction with the appendix Figures 1-4 The present invention will be further described to better illustrate the implementation process of the invention: like Figure 2 , Figure 4 As shown, the detection device uses a housing 1; the housing 1 is equipped with a constant pressure chamber 4, an oxygen concentration measuring component 6, a pressure measuring component, a first control valve 5, and a second control valve 9. The oxygen concentration measuring component 6, the pressure measuring component, the first control valve 5, and the second control valve 9 are all connected to the constant pressure chamber 4; the constant pressure chamber 4 is connected to the main outlet pipe 8 of the ventilator, and the connection point is provided with the air pump 3 and the one-way valve 2 in sequence; the gas of the ventilator enters the housing 1 from the air inlet 101 of the housing 1, and enters the one-way valve 2, the air pump 3, the constant pressure chamber 4, the solenoid valve 5 and the air outlet 102 of the housing 1 in sequence through the pipe 8.

[0016] The pressure measuring component, air pump 3, control valve, and cloud platform are all electrically connected to the computing and control module; When the constant pressure chamber 4 is pre-treated for exhaust before testing, the air pump 3 and the first control valve 5 are opened, and the second control valve 9 is closed. When the constant pressure of the constant pressure chamber 4 is adjusted before testing, the air pump 3 and the second control valve 9 are opened, and the first control valve 5 is closed.

[0017] Preferably, both the first control valve 5 and the second control valve 9 are solenoid valves. The output diameter of the second control valve is much smaller than that of the first control valve. The venting rate is related to the gas pressure in the constant pressure chamber. The interface of the first control valve 5 is M5 (5mm). The second control valve 9, which vents slightly, is connected to a thin venting tube 91 with an inner diameter that can range from 0.06mm to 1.5mm, and can be selected as 0.5mm, which is one-tenth of the venting rate of the first control valve 5.

[0018] Preferably, the pressure measuring component is a pressure sensor 7, and the pressure value measured by the pressure sensor 7 is used as feedback within the constant pressure chamber 4.

[0019] Preferably, the oxygen concentration measuring component 6 adopts a paramagnetic oxygen sensor. Existing oxygen concentration detection solutions for ventilator testers use oxygen batteries, which achieve oxygen concentration detection based on electrochemical principles. Their lifespan is typically one year, requiring replacement. Oxygen batteries are affected by their own lifespan and the environment, and will deviate after a period of use, requiring periodic calibration, making them unsuitable as key components of calibration equipment. Traditional oxygen batteries pollute the environment after disposal. Traditional oxygen batteries require altitude compensation, making them unsuitable for metrology work in high-altitude areas. The paramagnetic oxygen sensor solves the problems of limited lifespan, measurement deviation over time, and the need for altitude compensation in the oxygen concentration detection part of ventilator testers.

[0020] The air pump 3, constant pressure chamber 4, first control valve 5, second control valve 9, and circuit board (operation control module, data acquisition module) are fixed inside the housing 1 by screws.

[0021] The oxygen concentration measuring component 6 and the pressure sensor 7 are fixed to the constant pressure chamber 4 by threads to ensure a tight seal and prevent air leakage.

[0022] Equipping the ventilator with an external bypass-type online oxygen concentration metering and detection device allows for real-time uploading of oxygen concentration data and comparison with the oxygen concentration data on the ventilator (ventilators in hospitals can connect to the hospital's internal network), enabling periodic monitoring of the ventilator's oxygen concentration data for abnormalities. If the device requires traceability testing of the oxygen concentration measurement component 6, it can be directly disassembled and sent to the relevant metrology and testing institution for traceability, without delaying the use of the equipment in hospitals and related medical institutions.

[0023] A detection method based on the above-described bypass-type online oxygen concentration metering and detection device: The detection method includes the following steps: S1: A single detection command is sent to the computing control module via the cloud platform. Each time a detection is required, the computing control module receives the detection command and begins to preprocess the constant pressure chamber 4: the computing control module controls the opening of the air pump 3 and the first control valve 5, the air pump 3 starts pumping air, the computing control module calculates the running time of the air pump 3 based on the volume of the constant pressure chamber 4, and the first control valve 5 discharges the residual gas in the constant pressure chamber 4; after the calculated running time is completed, it is determined that the constant pressure chamber 4 is full of the gas to be tested, and the first control valve 5 is closed; S2: The air pump 3 continuously pumps air, and opens or closes the second control valve 9 to release a small amount of air into the constant pressure chamber 4. The air pump 3 pumps air and the second control valve 9 release air to regulate the gas pressure in the constant pressure chamber 4. The pressure value measured by the pressure sensor 7 is transmitted to the data acquisition module and then transmitted to the cloud platform through the calculation and control module for feedback within the constant pressure chamber 4. When the pressure value in the constant pressure chamber 4 is stably controlled at a fixed value, the air pump 3 is turned off. S3: The paramagnetic oxygen sensor detects the gas in the constant pressure chamber 4 and transmits the signal to the computing and control module. The computing and control module feeds back the measured value to the cloud platform and the human-machine interaction module through the 5G communication module to realize online measurement. The cloud platform can be a mobile app or a dedicated IoT device management platform, such as the mobile IoT open platform, OneNet. For sensitive data, it can be connected to the hospital's internal management platform, which can send commands to the computing and control module. The human-machine interaction module includes a screen and buttons for local viewing. S4: The cloud platform sends a continuous detection command to the computing control module, repeating the above steps S1-S3. The oxygen concentration measuring component 6 can measure the gas in the constant pressure chamber 4 multiple times.

[0024] Preferably, in step S2, the one-way valve 2 prevents the gas in the constant pressure chamber from flowing into the main gas path, thus preventing the gas in the chamber from affecting the main gas path.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bypass-type online oxygen concentration metering and detection device, characterized in that: The detection device is a housing; the housing contains a constant pressure chamber, an oxygen concentration measuring component, a pressure measuring component, a first control valve, and a second control valve. The oxygen concentration measuring component, pressure measuring component, first control valve, and second control valve are all connected to the constant pressure chamber; the output diameter of the second control valve is smaller than the output diameter of the first control valve; the constant pressure chamber is connected to the main air outlet pipe of the ventilator, and an air pump and a one-way valve are sequentially installed at the connection point. The pressure measuring component, air pump, first control valve, second control valve, and cloud platform are all electrically connected to the computing and control module. When the constant pressure chamber is pre-treated for exhaust before testing, the air pump and the first control valve are opened, and the second control valve is closed. When the constant pressure of the constant pressure chamber is adjusted before testing, the air pump and the second control valve open or close according to the target pressure and the actual pressure value, while the first control valve closes. The first control valve has an M5 interface, and the second control valve for micro-venting is connected to a thin venting tube with an inner diameter of 0.5mm.

2. The bypass-type online oxygen concentration metering and detection device according to claim 1, characterized in that: Both the first control valve and the second control valve are solenoid valves.

3. The bypass-type online oxygen concentration metering and detection device according to claim 1, characterized in that: The pressure measuring component uses a pressure sensor.

4. The bypass-type online oxygen concentration metering and detection device according to claim 1, characterized in that: The oxygen concentration measuring component uses a paramagnetic oxygen sensor.

5. A detection method for the bypass-type online oxygen concentration metering and detection device according to any one of claims 1 to 4: characterized in that, The detection method includes the following steps: S1: A single detection command is sent to the computing control module via the cloud platform. Each time a detection is required, the computing control module receives the detection command and begins to preprocess the constant pressure chamber: the computing control module controls the air pump and the first control valve to open, the air pump starts pumping air, the computing control module calculates the air pump running time based on the volume of the constant pressure chamber, and the first control valve discharges the residual gas in the constant pressure chamber; after the calculated running time is completed, it is determined that the constant pressure chamber is full of the gas to be tested, and the first control valve is closed; S2: The air pump continuously pumps air, and opens or closes the second control valve to release a small amount of air into the constant pressure chamber. The air pump and the second control valve are used to regulate the gas pressure in the constant pressure chamber. The pressure value measured by the pressure sensor is transmitted to the data acquisition module, and then transmitted to the cloud platform through the calculation and control module for feedback within the constant pressure chamber. When the pressure value in the constant pressure chamber is stabilized and controlled at a fixed value, the air pump is turned off and the second control valve is closed. S3: The paramagnetic oxygen sensor detects the gas in the constant pressure chamber and transmits the signal to the computing and control module. The computing and control module feeds back the measured value to the cloud platform and the human-machine interaction module to realize online measurement. S4: The cloud platform sends a continuous detection command to the computing control module, repeating the above steps S1-S3. The oxygen concentration measuring component can measure the gas in the constant pressure chamber multiple times.

6. The detection method of the bypass-type online oxygen concentration metering and detection device according to claim 5: characterized in that, The detection method includes the following steps: In step S2, the one-way valve prevents gas from flowing into the main gas path from the constant pressure chamber.

Images