An expiratory end-tidal simulation device
By integrating the components of the gas path, reducing pipeline connections, and using control valve groups and cylinder designs, the problems of high airflow resistance and residual gas affecting detection accuracy have been solved, achieving higher detection stability and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEC MEDICAL SYST
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-07
AI Technical Summary
In existing end-expiratory simulation devices, inconsistent airway connections and excessively long tubing result in high airflow resistance, affecting detection accuracy. Furthermore, the increased inner diameter leads to residual air volume, which in turn affects test results.
By integrating the components of the air circuit and reducing pipeline connections, and by controlling the design of the valve group and cylinder, airflow resistance is reduced, useless cavities are compressed, and detection accuracy is ensured.
It improves the stability and consistency of the gas path, reduces interference, ensures the accuracy of detection, and simplifies the equipment maintenance and replacement process.
Smart Images
Figure CN224471644U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of equipment testing, and in particular to an end-tidal simulation device. Background Technology
[0002] End-tidal carbon dioxide (ETC) concentration reflects lung ventilation and gas exchange efficiency. Increased or decreased ETC indicates problems with lung ventilation or gas exchange, or a underlying health issue. Abnormal ETC concentrations can be caused by a variety of factors, including but not limited to lung diseases such as chronic obstructive pulmonary disease (COPD), lung infections, and pulmonary embolism, or poor blood circulation due to heart disease. Therefore, monitoring ETC is crucial for assessing a patient's respiratory status and treatment effectiveness.
[0003] For accurate end-expiratory measurement devices to function properly, they need to undergo rigorous testing. Therefore, a device that can completely simulate human breathing and has high consistency and accuracy is required. Against this background, end-expiratory simulation devices have emerged.
[0004] The advent of expiratory carbon dioxide monitoring curves represents another significant advancement in the use of non-invasive technology to monitor lung function, particularly lung ventilation. This makes continuous and quantitative clinical monitoring of patients possible. Precise end-expiratory measurement devices require rigorous testing equipment. Therefore, a device that can completely simulate human breathing and possesses high consistency and accuracy is needed. Under these conditions, a precise mechanical testing device is required. The quality of the testing device depends on whether it can be precisely controlled and more closely resemble the human respiratory system. To make the device closely resemble the human respiratory system, the airway needs to be perfectly planned.
[0005] For end-expiratory simulation devices, the various components are often connected by tubing or hoses. This connection cannot guarantee the consistency of each device, and excessively long tubing can affect airflow and increase airflow resistance. To reduce resistance, the inner diameter of the connecting hose needs to be increased. However, the risk brought by increasing the inner diameter cannot be ignored. With the increase in inner diameter, the gas volume in the tubing increases accordingly, and the increase in residual gas affects the accuracy of the test. Furthermore, the increase in residual gas cannot fully simulate the residual gas state of the human exhalation tract.
[0006] How to provide an end-expiratory simulation device that reduces interference is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0007] The purpose of this invention is to provide an end-expiratory simulation device that integrates airway components, reduces airflow resistance, compresses useless cavities in the airway, and ensures the accuracy of the detection.
[0008] To solve the above-mentioned technical problems, this utility model provides an end-expiratory simulation device, including a base plate and a standard gas cylinder, an air cylinder, and a control valve assembly installed on the base plate. The control valve assembly includes a valve body base, a channel cover plate, and multiple control valve actuation assemblies. The multiple control valve actuation assemblies are installed on the upper end of the valve body base. The rear end of the valve body base is provided with a standard gas slot and an air slot, and the front end of the valve body base is provided with multiple working slots. The standard gas slot and the air slot are respectively connected to the inlet and outlet of the standard gas cylinder and the air cylinder. The channel cover plate covers each of the working slots and is connected to a working connector. The valve body base is provided with multiple channels. The control valve actuation assembly actuates to make the standard gas slot and the air slot open or close the corresponding working slot.
[0009] Preferably, the plurality of working slots at the front end of the valve body base include a standard gas intake slot, a standard gas depressurization slot, a simulated breathing slot, and an air exhaust slot. The standard gas slot is connected to the standard gas intake slot, the standard gas depressurization slot, and the simulated breathing slot through a first channel, a second channel, and a third channel, respectively. The air exhaust slot is connected to the simulated breathing slot and the air exhaust slot through a fourth channel and a fifth channel, respectively. The five control valve actuation assemblies are each equipped with five corresponding channels and control the opening and closing state of the corresponding channels.
[0010] Preferably, the valve body base is provided with five mounting seats arranged in a horizontal direction, and the five control valve actuation assemblies are installed in the five mounting seats in a horizontal direction. The standard gas inlet, the standard gas pressure relief inlet, the simulated breathing inlet and the air outlet are arranged in a horizontal direction at the front end of the valve body base.
[0011] Preferably, the standard gas pressure relief slot and the air discharge slot have openings on their lower sides that connect to the outside.
[0012] Preferably, the standard gas inlet, the standard gas depressurization inlet, the simulated breathing inlet, the air outlet, the standard gas inlet, and the air outlet are provided with matching sealing rings at their edges. The standard gas cylinder and the air cylinder are provided with mounting plates at their front ends. The mounting plates are tightly fitted to the rear end of the valve body base, and the channel cover is tightly fitted to the front end of the valve body base.
[0013] Preferably, the front of the channel cover is provided with a simulated breathing interface, a standard gas venting valve, a power socket, a power switch, and a power button.
[0014] Preferably, the valve body base is provided with a pressure differential detection interface.
[0015] Preferably, the rear end of the base plate is provided with a synchronous slider, a driver, a transmission mechanism and a guide mechanism.
[0016] Preferably, the valve body base is provided with a flow differential pressure detection channel, and the valve body base is equipped with a flow regulating plug, a flow regulating motor and a flow regulating screw for driving the flow regulating plug to move longitudinally, so as to control the insertion depth of the flow regulating plug, and the flow regulating plug is aligned with the flow differential pressure detection channel.
[0017] Preferably, it includes two flow differential pressure detection channels arranged in parallel, and correspondingly provided with two sets of flow regulating bolts, flow regulating motors and flow regulating screws.
[0018] This utility model provides an end-expiratory simulation device, including a base plate and a standard gas cylinder, an air cylinder, and a control valve assembly mounted on the base plate. The control valve assembly includes a valve body base, a channel cover plate, and multiple control valve actuation assemblies. The multiple control valve actuation assemblies are mounted on the upper end of the valve body base. The rear end of the valve body base is provided with a standard gas slot and an air slot, and the front end of the valve body base is provided with multiple working slots. The standard gas slot and the air slot are respectively connected to the inlet and outlet of the standard gas cylinder and the air cylinder. The channel cover plate covers each working slot and is connected to a working connector. Multiple channels are provided inside the valve body base. The actuation of the control valve actuation assembly causes the standard gas slot and the air slot to open or close the corresponding working slot.
[0019] By integrating the components of the air circuit, reducing pipeline connections, decreasing airflow resistance, and compressing useless cavities in the air circuit, the accuracy of detection is ensured, making the air circuit more stable, more consistent, and less prone to interference. The on / off path structure of the air valve is directly integrated into the air circuit structure, eliminating the hassle of connecting external air valves, and replacement is also more convenient, requiring only the action control part to be replaced. Attached Figure Description
[0020] Figure 1 A schematic diagram of a specific embodiment of the end-tidal simulation device provided by this utility model;
[0021] Figure 2 A schematic diagram illustrating the principle of one specific embodiment of the end-tidal simulation device provided by this utility model;
[0022] Figure 3 An exploded view of a specific embodiment of the end-tidal simulation device provided by this utility model;
[0023] Figure 4 This is a schematic diagram of flow regulation for a specific embodiment of the end-tidal simulation device provided by this utility model.
[0024] The components include: base plate 1, standard gas cylinder 2, air cylinder 3, valve body base 4, standard gas inlet 4-1, air inlet 4-2, standard gas intake inlet 4-3, standard gas pressure relief inlet 4-4, simulated breathing inlet 4-5, air exhaust inlet 4-6, sealing ring 4-7, flow and pressure differential detection channel 4-8, channel cover plate 5, control valve actuation assembly 6, first control valve 6-1, second control valve 6-2, third control valve 6-3, fourth control valve 6-4, fifth control valve 6-5, mounting plate 7, simulated breathing interface 8, standard gas vent valve 9, power socket 10, power switch 11, power button 12, synchronous slider 13, synchronous lead screw 14, synchronous motor 15, flow regulating bolt 16, flow regulating motor 17, flow regulating lead screw 18, regulating mounting base 19, motor mounting base 20, flow cut-off sealing ring 21, flow regulating sealing ring 22, position detection module 23, and pressure differential detection interface 24. Detailed Implementation
[0025] The core of this invention is to provide an end-expiratory simulation device that integrates airway components, reduces airflow resistance, compresses useless cavities in the airway, and ensures the accuracy of detection.
[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0027] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of a specific embodiment of the end-tidal simulation device provided by this utility model; Figure 2 A schematic diagram illustrating the principle of one specific embodiment of the end-tidal simulation device provided by this utility model; Figure 3 An exploded view of a specific embodiment of the end-tidal simulation device provided by this utility model; Figure 4 This is a schematic diagram of flow regulation for a specific embodiment of the end-tidal simulation device provided by this utility model.
[0028] This utility model provides an end-expiratory simulation device, including a base plate 1 and a standard gas cylinder 2, an air cylinder 3, and a control valve assembly installed on the base plate 1. Specifically, the base plate 1 can be a rectangular plate with the length direction being longitudinal and the width direction being transverse. The standard gas cylinder 2 and air cylinder 3 extend longitudinally and are arranged laterally side by side, installed in the middle of the base plate 1. The control valve assembly is installed at one longitudinal end of the base plate 1, and a driver and other components are installed at the other longitudinal end of the base plate 1 to drive the extension and retraction of the two cylinders. The end where the control valve assembly is installed is defined as the front end, and the end where the driver is installed is defined as the rear end.
[0029] Furthermore, the control valve assembly includes a valve body base 4, a channel cover 5, and multiple control valve actuation assemblies 6. The lower end of the valve body base 4 faces the base plate 1, and the valve body base 4 can be directly installed on the base plate 1, or it can be stably connected to the base plate 1 through other components. The multiple control valve actuation assemblies 6 are installed on the upper end of the valve body base 4. The rear end of the valve body base 4 is provided with a standard gas slot 4-1 and an air slot 4-2. The front end of the valve body base 4 is provided with multiple working slots. The standard gas slot 4-1 is connected to the inlet and outlet of the front end of the standard gas cylinder 2, and the air slot 4-2 is connected to the inlet and outlet of the front end of the air cylinder 3. The channel cover 5 covers each working slot and is connected to a working connector, so that the working connector is connected to the corresponding working slot. The valve body base 4 has multiple channels inside, through which the standard gas port 4-1 and air port 4-2 are connected to their respective working ports. Simultaneously, each control valve actuation assembly 6 is installed at a corresponding channel. When the control valve actuation assembly 6 actuates, it changes the on / off state of the corresponding channel, thereby opening or closing the standard gas port 4-1 and air port 4-2 to the corresponding working port. Specifically, for locations requiring connection, an opening is provided at the corresponding position on the channel cover plate 5. A working connector is installed in front of the opening. When the channel cover plate 5 covers the front end of the valve body base 4, the working connector is connected to the corresponding working port.
[0030] By integrating the components of the air circuit, reducing pipeline connections, decreasing airflow resistance, and compressing useless cavities in the air circuit, the accuracy of detection is ensured, making the air circuit more stable, more consistent, and less prone to interference. The on / off path structure of the air valve is directly integrated into the air circuit structure, eliminating the hassle of connecting external air valves, and replacement is also more convenient, requiring only the action control part to be replaced.
[0031] Specifically, the standard gas cylinder 2 and the air cylinder 3 have the same inner diameter and are each equipped with a piston that reciprocates within the corresponding cylinder. The pistons of the standard gas cylinder 2 and the air cylinder 3 extend and retract synchronously, dividing them into rod-side and rodless chambers. The inlets and outlets of the standard gas cylinder 2 and the air cylinder 3 are located on the rodless chamber side and are simultaneously connected to a control valve assembly. The control valve assembly is equipped with a standard gas inlet, a standard gas pressure relief outlet, a simulated breathing inlet, and an air outlet. The standard gas inlet connects to a standard gas cylinder containing a fixed concentration of mixed carbon dioxide gas, used to draw the fixed concentration of carbon dioxide gas into the standard gas cylinder 2. The simulated breathing inlet connects to the mask of the end-expiratory breathing detection device, outputting simulated breathing gas to the mask. The standard gas pressure relief outlet and the air outlet are connected to the outside environment, used for discharging the standard gas from the standard gas cylinder 2 and the air from the air cylinder 3. The controller connects to the control valve assembly and controls the opening and closing of each opening according to the simulation process.
[0032] The working process consists of three stages: inhalation, inhalation stop, and exhalation. These three stages cycle continuously and are coordinated with the opening and closing of the control valve group to form the complete working state of the equipment. During inhalation, the inlet and outlet of standard gas cylinder 2 are connected to the standard gas inlet, and the inlet and outlet of air cylinder 3 are connected to the simulated breathing inlet. Other openings are closed. The volume of the rodless chambers of standard gas cylinder 2 and air cylinder 3 increases. The carbon dioxide gas mixed at a fixed concentration in the standard gas cylinder is drawn into the rodless chamber of standard gas cylinder 2, and the air from the mask of the end-expiration detection device is drawn into the rodless chamber of air cylinder 3 to simulate the inhalation process. When inhalation stops, the inlet and outlet of standard gas cylinder 2 are connected to the standard gas pressure relief outlet, while other openings are closed. The rodless chamber volumes of standard gas cylinder 2 and air cylinder 3 remain unchanged. The purpose of this process is to release the pressure in standard gas cylinder 2. Because the pressure in the standard gas cylinder is higher than the pressure in standard gas cylinder 1 during inhalation, the pressure in the standard gas cylinder will be very high at the end of inhalation, exceeding atmospheric pressure. At this time, the gas volume in the standard gas cylinder is higher than its actual volume under natural conditions, so it is necessary to release the excess pressure gas, which can be directly discharged into the air. During exhalation, the inlet and outlet of standard gas cylinder 2 are connected to the simulated breathing port, and the inlet and outlet of air cylinder 3 are connected to the air exhaust port. The rodless chamber volumes of standard gas cylinder 2 and air cylinder 3 decrease. The standard gas in the rodless chamber of standard gas cylinder 2 is discharged into the mask for carbon dioxide detection, while the air in the rodless chamber of air cylinder 3 is discharged into the outside.
[0033] The human respiratory process is simulated using a dual-cylinder system. Standard gas cylinder 2 exhales a standard carbon dioxide mixture, while air cylinder 3 simulates inhalation. The two cylinders work in conjunction with the valve to complete the process of exhaling carbon dioxide and inhaling air. The gases from the two cylinders do not interfere with each other or mix, ensuring that the standard carbon dioxide mixture exhaled passes through the end-expiratory breath test device's mask each time, while also ensuring that fresh air flows into the end-expiratory breath test device during inhalation. Furthermore, by using cylinders to simulate the linear change in gas volume as the piston pushes and pulls, the tidal volume of respiration can be precisely controlled, improving the accuracy of the simulation. This control method, primarily based on structure and secondarily on electrical control, simplifies complex mechanical and electronic controls. Removing complex structures and electrical controls ensures better equipment maintenance and reliability, improves performance, and enables more complex respiratory simulations.
[0034] In the end-expiratory simulation device provided in this specific embodiment of the present invention, a standard gas cylinder 2 and an air cylinder 3 are arranged side by side. The inlet and outlet of the standard gas cylinder 2 and the inlet and outlet of the air cylinder 3 are both connected to the rodless chamber of the corresponding cylinder and are located on the same side. In order to achieve synchronous movement of the pistons in the two cylinders, a synchronization slider 13 is provided on the other side of the standard gas cylinder 2 and the air cylinder 3. The synchronization slider 13 is connected to the pistons in the standard gas cylinder 2 and the air cylinder 3 simultaneously through two piston rods.
[0035] The control valve assembly 6 includes a first control valve 6-1, a second control valve 6-2, a third control valve 6-3, a fourth control valve 6-4, and a fifth control valve 6-5. The inlet and outlet of the standard gas cylinder 2 are respectively connected to the outlet of the first control valve 6-1, the inlet of the second control valve 6-2, and the inlet of the third control valve 6-3. The inlet of the first control valve 6-1 is connected to the standard gas inlet, the outlet of the second control valve 6-2 is connected to the standard gas pressure relief outlet, and the outlet of the third control valve 6-3 is connected to the simulated breathing port. The inlet and outlet of the air cylinder 3 are respectively connected to the outlet of the fourth control valve 6-4 and the inlet of the fifth control valve 6-5. The inlet of the fourth control valve 6-4 is connected to the simulated breathing port, and the outlet of the fifth control valve 6-5 is connected to the air outlet.
[0036] During the inhalation process, the first control valve 6-1 and the fourth control valve 6-4 are opened, the inlet and outlet of the standard gas cylinder 2 are connected to the standard gas inhalation port, and the inlet and outlet of the air cylinder 3 are connected to the simulated breathing port. The remaining control valves are closed. The synchronous slider 13 drives the pistons of the standard gas cylinder 2 and the air cylinder 3 to move synchronously away from the control valve group. The volume of the rodless chamber of the standard gas cylinder 2 and the air cylinder 3 increases. The carbon dioxide gas of a fixed concentration mixed in the standard gas cylinder is drawn into the rodless chamber of the standard gas cylinder 2 through the first control valve 6-1. The air at the mask of the end-expiration detection device is drawn into the rodless chamber of the air cylinder 3 through the fourth control valve 6-4 to simulate the inhalation process.
[0037] When the intake stops, the second control valve 6-2 opens and the other control valves close. The inlet and outlet of the standard gas cylinder 2 are connected to the standard gas pressure relief outlet. The synchronous slider 13 remains fixed. The volume of the rodless chamber of the standard gas cylinder 2 and the air cylinder 3 remains unchanged. The gas in the standard gas cylinder 2 is discharged to the outside through the second control valve 6-2.
[0038] During exhalation, the third control valve 6-3 and the fifth control valve 6-5 open, while the remaining control valves close. The inlet and outlet of the standard gas cylinder 2 connect to the simulated breathing port, and the inlet and outlet of the air cylinder 3 connect to the air outlet. The synchronous slider 13 drives the pistons of the standard gas cylinder 2 and the air cylinder 3 to move synchronously towards the control valve assembly, reducing the volume of the rodless chambers of the standard gas cylinder 2 and the air cylinder 3. The standard gas in the rodless chamber of the standard gas cylinder 2 is discharged to the mask for carbon dioxide detection through the third control valve 6-3, while the air in the rodless chamber of the air cylinder 3 is discharged to the outside through the fifth control valve 6-5.
[0039] To achieve the above working process, the valve body base 4 has multiple working slots at its front end, including a standard gas intake slot 4-3, a standard gas depressurization slot 4-4, a simulated breathing slot 4-5, and an air exhaust slot 4-6. The standard gas slot 4-1 is connected to the standard gas intake slot 4-3, the standard gas depressurization slot 4-4, and the simulated breathing slot 4-5 through the first channel, the second channel, and the third channel, respectively. The air slot 4-2 is connected to the simulated breathing slot 4-5 and the air exhaust slot 4-6 through the fourth channel and the fifth channel, respectively. The five control valve actuation assemblies 6 are each equipped with one of the five channels and control the opening and closing status of the corresponding channels.
[0040] The valve body base 4 has five mounting seats arranged horizontally in sequence. Five control valve assemblies 6 are installed horizontally on the five mounting seats. The standard gas intake port 4-3, standard gas depressurization port 4-4, simulated breathing port 4-5, and air exhaust port 4-6 are arranged horizontally at the front end of the valve body base 4. Flanges are provided at the lower ends of the five control valves, which are fixed to the valve body base 4 with bolts. An air inlet is provided on the side of the valve body base 4. One end of the air inlet connects to a standard gas cylinder, and the other end connects to the standard gas intake port 4-3. This air inlet serves as the standard gas intake port. The bottom surface of the standard gas intake port 4-3 has two openings: one for the first channel and one for the air inlet. After the channel cover plate 5 is applied, the standard gas intake port 4-3 forms a closed cavity, connecting the first channel and the air inlet. The bottom surface of the standard gas pressure relief slot 4-4 has an opening for the second channel. Simultaneously, an opening connecting to the outside is located below the valve body base 4. When the channel cover plate 5 is applied, an open cavity is formed, allowing the second channel to connect to the outside, i.e., the standard gas pressure relief outlet. The bottom surface of the simulated breathing slot 4-5 has two openings: one for the third channel and the other for the fourth channel. When the channel cover plate 5 is applied, the simulated breathing slot 4-5 forms a closed cavity and connects to the simulated breathing interface 8, connecting the aforementioned openings, i.e., the simulated breathing port. The bottom surface of the air exhaust slot 4-6 has an opening for the fifth channel. Simultaneously, an opening connecting to the outside is located below the valve body base 4. When the channel cover plate 5 is applied, an open cavity is formed, allowing the fifth channel to connect to the outside, i.e., the air exhaust outlet.
[0041] To improve the sealing effect, a matching sealing ring 4-7 is provided at the edge of the standard gas intake port 4-3, the standard gas depressurization port 4-4, the simulated breathing port 4-5, the air exhaust port 4-6, the standard gas port 4-1, and the air port 4-2. A mounting plate 7 is provided at the front end of the standard gas cylinder 2 and the air cylinder 3. The mounting plate 7 is tightly attached to the rear end of the valve body base 4, and the channel cover plate 5 is tightly attached to the front end of the valve body base 4.
[0042] Furthermore, the front of the channel cover 5 is equipped with a simulated breathing interface 8, a standard gas venting valve 9, a power socket 10, a power switch 11, and a power button 12. The standard gas venting valve 9 cooperates with the standard gas pressure relief slot 4-4, and the standard gas pressure relief outlet is opened and closed by rotating the standard gas venting valve 9.
[0043] In the end-expiratory simulation device provided in this specific embodiment of the present invention, a synchronous slider 13, a driver, a transmission mechanism, and a guide mechanism are provided at the rear end of the base plate 1. Specifically, the driver is a synchronous motor 15, the transmission mechanism is a synchronous lead screw 14, and it is equipped with a longitudinally extending guide rod, and a limit switch for detecting the cylinder extension state is also provided.
[0044] Based on the end-expiratory simulation device provided in the above specific embodiments, a flow differential pressure detection channel (4-8) is provided on the valve body base (4), and a flow regulating plug (16) and a flow regulating motor (17) and a flow regulating screw (18) for driving the flow regulating plug (16) to move longitudinally are installed on the valve body base (4) to control the insertion depth of the flow regulating plug (16), and the flow regulating plug (16) is aligned with the flow differential pressure detection channel (4-8). Specifically, an adjustment mounting seat (19) and a motor mounting seat (20) are provided on the base plate (1), the flow regulating plug (16) is installed on the adjustment mounting seat (19), and a flow cut-off sealing ring (21) (4-7) and a flow regulating sealing ring (22) (4-7) are provided at the front end of the flow regulating plug (16). Different sealing rings (4-7) have different functions depending on the insertion depth of the flow regulating plug (16) to achieve flow cut-off or flow regulation. The flow regulating motor (17) is mounted on the motor mounting base (20), connected to the flow regulating screw (18) via a coupling, and equipped with a position detection module (23).
[0045] It includes two flow differential pressure detection channels (4-8) arranged in parallel, and correspondingly equipped with two sets of flow regulating plugs (16), flow regulating motors (17) and flow regulating screws (18). The two sets of equipment are arranged vertically, and the two-way regulation can be applied to different occasions. The first occasion is when pure carbon dioxide and air are mixed and flow into the standard gas cylinder (2). In this case, both flow control and detection are used. One path is connected to pure carbon dioxide gas, and the other path can be directly opened to air for direct air intake. The other occasion is when a single standard carbon dioxide mixed gas is used. Only one flow regulation and measurement structure needs to be used, and the other flow regulation and measurement structure can be controlled to be closed.
[0046] Meanwhile, a pressure differential detection interface (24) is provided on the valve body base (4). The flow regulating screw (18) causes the depth of the flow regulating plug (16) inserted into the flow differential detection channel (4-8) to change. The change in depth adjusts the cross-sectional area of the flow pipe between the air inlet and the flow differential detection channel (4-8) to control the flow rate. The detection channel uses a Venturi tube detection method. The pressure differential detection interface (24) is connected to the corresponding detection point of the flow detection structure to measure the pressure and differential pressure values flowing into the flow detection structure, thereby calculating the flow rate.
[0047] The end-tidal simulation device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A device for simulating end-expiratory breathing, characterized in that, The system includes a base plate (1) and a standard gas cylinder (2), an air cylinder (3), and a control valve assembly mounted on the base plate (1). The control valve assembly includes a valve body base (4), a channel cover plate (5), and multiple control valve actuation assemblies (6). The multiple control valve actuation assemblies (6) are mounted on the upper end of the valve body base (4). The rear end of the valve body base (4) is provided with a standard gas slot (4-1) and an air slot (4-2). The front end of the valve body base (4) is provided with multiple working slots. The standard gas slot (4-1) and the air slot (4-2) are respectively connected to the inlet and outlet of the standard gas cylinder (2) and the air cylinder (3). The channel cover plate (5) covers each of the working slots and is connected to a working connector. The valve body base (4) has multiple channels inside. The control valve actuation assembly (6) actuates to make the standard gas slot (4-1) and the air slot (4-2) open or close the corresponding working slot.
2. The end-expiratory simulation device according to claim 1, characterized in that, The valve body base (4) has multiple working slots at its front end, including a standard gas intake slot (4-3), a standard gas depressurization slot (4-4), a simulated breathing slot (4-5), and an air exhaust slot (4-6). The standard gas slot (4-1) is connected to the standard gas intake slot (4-3), the standard gas depressurization slot (4-4), and the simulated breathing slot (4-5) through a first channel, a second channel, and a third channel, respectively. The air slot (4-2) is connected to the simulated breathing slot (4-5) and the air exhaust slot (4-6) through a fourth channel and a fifth channel, respectively. The five control valve actuation assemblies (6) are each equipped with five channels and control the opening and closing status of the corresponding channels.
3. The end-expiratory simulation device according to claim 2, characterized in that, The valve body base (4) is provided with five mounting seats arranged in a horizontal direction. The five control valve actuation assemblies (6) are installed in the five mounting seats in a horizontal direction. The standard gas inlet (4-3), the standard gas pressure relief inlet (4-4), the simulated breathing inlet (4-5), and the air outlet inlet (4-6) are arranged in a horizontal direction at the front end of the valve body base (4).
4. The end-expiratory simulation device according to claim 3, characterized in that, The standard gas pressure relief slot (4-4) and the air discharge slot (4-6) are provided with openings on their lower sides that connect to the outside.
5. The end-expiratory simulation device according to claim 4, characterized in that, The standard gas inlet (4-3), the standard gas depressurization inlet (4-4), the simulated breathing inlet (4-5), the air outlet (4-6), the standard gas inlet (4-1), and the air outlet (4-2) are provided with matching sealing rings (4-7). The front ends of the standard gas cylinder (2) and the air cylinder (3) are provided with mounting plates (7). The mounting plates (7) are tightly attached to the rear end of the valve body base (4). The channel cover (5) is tightly attached to the front end of the valve body base (4).
6. The end-expiratory simulation device according to claim 1, characterized in that, The channel cover (5) is equipped with a simulated breathing interface (8), a standard gas venting valve (9), a power socket (10), a power switch (11), and a power button (12).
7. The end-expiratory simulation device according to claim 1, characterized in that, The valve body base (4) is provided with a pressure differential detection interface (24).
8. The end-expiratory simulation device according to claim 1, characterized in that, The rear end of the base plate (1) is provided with a synchronous slider (13), a driver, a transmission mechanism and a guide mechanism.
9. The end-expiratory breath simulation device according to any one of claims 1 to 8, characterized in that, The valve body base (4) is provided with a flow differential pressure detection channel (4-8). The valve body base (4) is equipped with a flow regulating plug (16) and a flow regulating motor (17) and a flow regulating screw (18) for pushing the flow regulating plug (16) to move longitudinally, so as to control the insertion depth of the flow regulating plug (16). The flow regulating plug (16) is aligned with the flow differential pressure detection channel (4-8).
10. The end-expiratory simulation device according to claim 9, characterized in that, It includes two flow differential pressure detection channels (4-8) arranged in parallel, and correspondingly provided with two sets of flow regulating plugs (16), flow regulating motors (17) and flow regulating screws (18).