A breathing simulator fitting test device and fitting test method

Abstract

The application discloses the technical field of respiratory simulator test and relates to a respiratory simulator fitting test device and a fitting test method, and aims to solve the problem that a traditional respiratory simulator test device cannot effectively simulate respiratory decay detection in the prior art. The device comprises a rack and a metering device. The rack is internally provided with a composite cylinder. The composite cylinder comprises a shell. The shell is formed by two adjacent hollow cylindrical barrels. A T-shaped partition plate is arranged at the middle position in the shell cavity. Sealing plates are rotatably arranged at the centers of the two cylindrical barrels. The end of the T-shaped partition plate and the rotating shafts of the two sealing plates are sealingly matched. The two sealing plates and the T-shaped partition plate form a first driving cavity, a second driving cavity and a movable cavity in the shell. The device is used for simulating the supply of atomized liquid medicine and fitting the application scene demand. The device can effectively match the respiratory rhythm change of patients in the actual breathing process and provides an effective verification method.

Description

Technical Field

[0001] This invention relates to a breathing simulator fitting test device and fitting test method, belonging to the field of breathing simulator test technology. Background Technology

[0002] A breathing simulator is a sophisticated professional device designed to simulate the physiological characteristics of human respiration (respiratory rate, tidal volume, and pressure waveform, etc.) to evaluate and test the performance and safety of various medical devices. By measuring deviations in key parameters such as flow accuracy and pressure fluctuations, it objectively assesses whether the simulator's various functional indicators meet design standards. However, during actual human respiration, as the volume of gas inside the lungs changes, the rate of inhalation and exhalation usually decreases significantly at the end of inhalation or exhalation. To improve the supply efficiency of aerosol drug particles and match the comfort of human respiration, the traditional method of unidirectional air supply or inhalation using cylinders is no longer applicable. Therefore, a more suitable method is urgently needed to improve the simulated breathing process, and an effective testing method is required to ensure its applicability in various environments. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a breathing simulator fitting test device and fitting test method for simulating the supply of nebulized drug solution and the fitting of application scenario requirements. It can effectively match the changes in breathing rhythm of patients during actual breathing and provides an effective verification method to detect whether the product is qualified.

[0004] To achieve the above objectives, the present invention employs the following technical solution: On one hand, the present invention provides a breathing simulator fitting test device, including a frame and an extensometer. A composite cylinder is installed in the frame. The composite cylinder includes a shell, which is formed by two adjacent hollow cylindrical bodies. A T-shaped partition is provided in the middle of the shell cavity. Sealing plates are rotatably provided inside the shell and at the center of the two cylinders. The ends of the T-shaped partition and the rotating shafts of the two sealing plates are sealed and fitted. The two sealing plates and the T-shaped partition respectively form a first driving cavity, a second driving cavity and a movable cavity inside the shell. A driving rod is slidably provided on the shell. The lower end of the driving rod is located inside the movable cavity and is sealed and fitted with the movable cavity. Two connecting pipes are also installed on the shell and are respectively connected to the first driving cavity and the second driving cavity. Both connecting pipes are configured to extract or deliver fluid. The upper end of the driving rod and the movable end of the extensometer are connected by a connecting rope.

[0005] Specifically, a sleeve is provided at the upper end of the outer shell, a piston plate that can move inside the sleeve is provided at the upper end of the drive rod, and a connecting rod is provided on the piston plate for connecting the connecting rope.

[0006] Specifically, several baffles are also installed inside the cavity of the outer shell, and the baffles are located on the front and rear paths of the two sealing plates' range of motion.

[0007] Specifically, the first driving cavity, the second driving cavity, and the movable cavity are all filled with oil.

[0008] Specifically, an overflow box is provided on the side of the outer casing, a valve plate is provided inside the overflow box, an overflow pipe is provided on the outer casing to connect the movable cavity and the overflow box, and an overflow valve is also provided on the overflow pipe.

[0009] Specifically, the two cylinders that make up the outer shell have different inner diameters.

[0010] Specifically, the frame is also equipped with a linear motion module, and the movable end of the linear motion module is fixedly connected to the end of the drive rod.

[0011] On the other hand, the present invention provides a breathing simulator fitting test method, which uses the above-mentioned breathing simulator fitting test device, and the method includes the following steps: S1: Reset the composite cylinder and extensometer, and ensure that the connecting rope is connected between the extensometer and the composite cylinder; S2: Inject fluid into the first drive chamber, the sealing plate compresses the movable cavity to make the drive rod rise, and after the drive rod is close to the upper position, maintain the injection speed of the first drive chamber and slowly extract the fluid from the second drive chamber until the sealing plate in the first drive chamber moves to the limit position, and then the first and second drive chambers stop injecting and extracting fluid. S3: Extract fluid into the first drive chamber, and the sealing plate evacuates the movable cavity to lower the drive rod. After the drive rod is close to the lower position, maintain the extraction speed of the first drive chamber and slowly inject fluid into the second drive chamber until the sealing plate in the first drive chamber moves to the limit position. Then the first and second drive chambers stop the extraction and injection of fluid. S4: Repeat steps S2-S3, recording the position change of the extensometer at 0.2s time intervals; S5: Fit the time-displacement curve equation based on time and the position change of the extensometer, and calculate the coordinates of the extreme points based on the curve; S6: Calculate the actual tidal volume, respiratory rate, and inspiratory-to-expiratory ratio based on the coordinate point location, and compare the obtained values ​​with the standard values.

[0012] Specifically, in step S1, when fluid injection or extraction fails to reset the sealing plate, the drive rod is reset, and excess or insufficient fluid in the movable cavity is collected or supplied by the overflow box.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention utilizes a specially designed cylinder to alter the extension length of the drive rod by varying the volume of multiple chambers within the composite cylinder. By controlling the volume of different chambers, the velocity decay of the drive rod can be easily adjusted, ultimately simulating the velocity decay during the breathing transition process. An extensometer monitors the position of this composite device, allowing for the simulation of time-displacement curves based on changes in equipment specifications, ultimately resulting in a reliable product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the fitting test device provided in the embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the composite cylinder provided in an embodiment of the present invention; Figure 3 This is a front view of the composite cylinder provided in an embodiment of the present invention; Figure 4 This is the present invention. Figure 3 A cross-sectional view of the composite cylinder provided in the embodiment along the AA direction; Figure 5 This is the present invention. Figure 3 A cross-sectional view of the composite cylinder in the BB direction provided in the embodiment; Figure 6 This is the present invention. Figure 3 A cross-sectional view of the composite cylinder provided in the embodiment; Figure 7 This is a schematic diagram of the fitting curve provided in an embodiment of the present invention; Figure 8 This is a respiratory simulation parameter calculation table provided in the embodiments of the present invention; Reference numerals: 1. Frame; 2. Composite cylinder; 201. Housing; 202. T-shaped partition; 203. Sealing plate; 204. Drive rod; 205. Connecting pipe; 206. Sleeve; 207. Piston plate; 208. Connecting rod; 209. Overflow box; 210. Valve plate; 211. Overflow pipe; 212. Stop block; 3. Extensometer; 4. Connecting rope; 5. Linear movement module. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] Example 1

[0019] This invention provides a respiratory simulator fitting test device for simulating the supply of nebulized medication and fitting application scenario requirements. It can effectively match the respiratory rhythm changes of patients during actual breathing and provides an effective verification method to detect product qualification. To achieve the respiratory fitting matching degree of the device and provide a reliable measurement means, the device can be configured to include a frame 1 and an extensometer 3. A composite cylinder 2 is installed inside the frame 1. The composite cylinder 2 includes a housing 201, which is composed of two adjacent hollow cylindrical bodies. (See reference...) Figure 2 As shown, a T-shaped partition 202 is provided in the middle of the cavity of the outer casing 201, such as... Figure 4 As shown, sealing plates 203 are rotatably disposed inside the outer casing 201 at the center positions of the two cylindrical structures. At this time, the ends of the T-shaped partition 202 and the rotating shafts of the two sealing plates 203 are sealed together. Under the action of the two sealing plates 203 and the T-shaped partition 202, a first driving cavity, a second driving cavity, and a movable cavity are respectively formed within the outer casing 201. Figure 4As shown, the first and second driving cavities are the upper cavities, while the movable cavity is the lower cavity. Figure 6As shown, a drive rod 204 is slidably mounted on the outer shell 201. The lower end of the drive rod 204 is located inside the movable cavity and is sealed to the movable cavity. Rotating the two sealing plates 203 changes the volume of the movable cavity. The rotation direction and speed of the two sealing plates 203 are controlled by a drive device, allowing for convenient adjustment of the volume change rate of the movable cavity. By connecting the movable cavity to the air supply system, intermittent air supply and degassing can be directly achieved. Furthermore, during simulated breathing, a velocity decay occurs in the final stage when switching between inhalation and exhalation, effectively controlling the final air supply volume and matching the required air supply speed to improve the comfort of passive breathing. The sealing plates 203 can be controlled by a motor drive. When the volume changes within the movable cavity, the drive rod 204 will move up and down under fluid compression, obtaining relevant position parameters for detecting the actual air supply volume. As a preferred drive method, two connecting pipes 2 can be installed on the outer shell 201. 05. Two connecting pipes 205 are configured to connect to the first and second driving chambers respectively. Both connecting pipes 205 are configured to extract or deliver fluid, thereby directly controlling the pressure changes in the corresponding chambers. This is ultimately reflected in the deflection of the sealing plate 203, which changes the volume. Finally, the upper end of the drive rod 204 and the movable end of the extensometer 3 are connected by a connecting rope 4 (the straight-line movement direction of the connecting rope 4 needs to be ensured; a pulley assembly can be used to ensure that the direction acting on the extensometer 3 is parallel to the sliding direction of the movable end of the extensometer 3). This allows the positional offset of the movable end of the extensometer 3 to be obtained based on the time change during simulated reciprocating breathing (the movable end of the extensometer 3 has an elastic reset function, which is existing technology and will not be discussed further here). Based on the time and the positional change of the movable end of the extensometer 3, a matching curve of the actual respiratory air supply is simulated. The tidal volume, inspiratory-expiratory ratio, and respiratory rate are calculated based on the curve characteristics. The calculation results are used to determine whether the product is qualified or how to improve it. When using the connecting pipe 205 to control the position change of the sealing plate 203 via fluid, it is preferable that during measurement, the first driving chamber, the second driving chamber, and the movable cavity are all filled with oil. This avoids measurement errors caused by the high gas compression ratio when the fluid is a gas medium. The actual amount of oil supplied or extracted can be directly reflected in the position change of the sealing plate 203. When the connecting pipe 205 supplies or extracts oil from the corresponding cavity, the movement speed of the sealing plate 203 can be adjusted by matching oil inlet or outlet pipes with different speeds. This effectively achieves the decay of the volume increase rate of the movable cavity within a suitable time period, thereby effectively simulating the decay process in the breathing transition.In some other embodiments, the inner diameters of the two cylinders constituting the outer shell 201 can be configured to be different, thereby providing different rates of volume change at the same rate. For a more complex simulation process, taking the first driving chamber as a larger cavity as an example, during the inhalation phase of the breathing simulation process (corresponding to the decrease in the volume of the active cavity and the outward exhaust), the first driving chamber can be used as the main means of action. The sealing plate 203 in the first driving chamber is squeezed towards the position of the active cavity. At this time, the sealing plate 203 in the second driving chamber can be squeezed synchronously to achieve the initial acceleration at the beginning of the inhalation phase. At the middle position, the sealing plate 203 in the second driving chamber can be stationary to achieve the attenuation of acceleration. According to the difference in fluid supply speed, the following two attenuation methods can be selectively provided at the end of the inhalation phase (the method with the slowest inhalation supply speed can be placed after the other method): Firstly, the sealing plate 203 in the first driving cavity is configured to be in a stationary state, thereby driving the sealing plate 203 in the second driving cavity to be pressed towards the position of the movable cavity; Secondly, the sealing plate 203 in the first driving cavity continuously squeezes the fluid in the second driving cavity, and changes the final squeezing speed of the active cavity volume by using the speed difference and volume difference.

[0020] In the above method, the decay process of breathing switching can be effectively simulated by setting the volume change, and more decay means are provided. This is conducive to accurately fitting the actual curve of simulated breathing and judging whether the final curve meets the actual needs. It can be understood that the connecting pipe 205 should not be understood as only being configured to supply or withdraw liquid at a fixed rate. It can be combined with pipes of different rates to achieve more levels of optimized control.

[0021] The breathing simulator fitting test device provided in this embodiment of the invention can, in order to ensure accurate braking and air supply, also have the entire portion below the drive rod 204 configured as the drive unit. In this case, a sleeve 206 can be provided at the upper end of the outer shell 201. (Refer to...) Figure 6 As shown, at this time, the upper end of the drive rod 204 is provided with a piston plate 207 that can move inside the sleeve 206. That is, the sleeve 206 itself serves as the housing part of the cylinder. At this time, a connecting rod 208 is provided on the piston plate 207 for connecting the connecting rope 4 for detection. The upper chamber inside the sleeve 206 is regarded as the actual corresponding chamber when the actual air supply or air extraction volume changes.

[0022] The present invention provides a breathing simulator fitting test device. To facilitate the resetting or precise control of the sealing plate 203, several baffles 212 can be installed inside the cavity of the outer shell 201. (See reference...) Figure 4As shown, the stop block 212 is positioned on the front and rear paths of the two sealing plates 203's range of motion to restrict the position of the sealing plates 203 and facilitate regular movements during reset.

[0023] This invention provides a respiratory simulator fitting test device. To prevent the sealing plate 203 from failing to return to its initial position due to pressure difference changes during reset, a linear motion module 5 is also provided inside the frame 1. The movable end of the linear motion module 5 is fixedly connected to the end of the drive rod 204. The movable end of the linear motion module 5 can be freely stretched in the non-drive state. When reset is required, the drive rod 204 can be adjusted up or down to bring it to its initial position. At this time, the outer shell 201... An overflow tank 209 is provided on the side. A valve plate 210 (slidingly fitted with the overflow tank 209) is installed inside the overflow tank 209, allowing oil to be replenished or extracted from the upper chamber of the overflow tank 209 during the lifting and resetting process of the drive rod 204. This ensures sufficient oil is filled in the movable cavity or avoids excessive oil. Therefore, an overflow pipe 211 is provided on the outer casing 201 to connect the movable cavity and the overflow tank 209, and an overflow valve is also installed on the overflow pipe 211 to ensure the oil system pressure. Various detection sensors involved in the device, such as pressure sensors for detecting oil pressure and position detection trigger switches for the sealing plate 203, are the preferred basic configuration for realizing the device's functions and will not be described in detail here.

[0024] Example 2

[0025] This invention provides a method for fitting a respiratory simulator, using the fitting test device described in Embodiment 1. Specifically, it provides a means to simulate respiratory decay and a method for testing the reliability of this means. The specific configuration method includes the following steps: S1: Reset the composite cylinder 2 and extensometer 3, and ensure that the connecting rope 4 is connected between the extensometer 3 and the composite cylinder 2. The connecting rope 4 is guided by the pulley group to ensure that the direction of the tension at both ends is parallel to the direction of movement of the moving end of the extensometer 3 and the direction of movement of the drive rod 204, respectively. S2: Inject fluid into the first drive chamber, and the sealing plate 203 compresses the movable cavity to make the drive rod 204 rise. After the drive rod 204 approaches the upper position, maintain the injection speed of the first drive chamber and slowly extract the fluid from the second drive chamber (the actual squeezing speed in the movable cavity slows down) until the sealing plate 203 in the first drive chamber moves to the limit position, and then the first and second drive chambers stop injecting and extracting fluid. S3: Fluid is extracted into the first drive chamber. The sealing plate 203 evacuates the movable cavity to lower the drive rod 204. After the drive rod 204 approaches the lower position, the extraction speed of the first drive chamber is maintained, and fluid is slowly injected into the second drive chamber (the actual expansion speed in the movable cavity is reduced) until the sealing plate 203 in the first drive chamber moves to the limit position, and then the extraction and injection of fluid in the first and second drive chambers stop. S4: Repeat steps S2-S3, recording the position change of extensometer 3 at 0.2s time intervals; S5: Fit the time-displacement curve equation based on time and the position change of extensometer 3, and calculate the coordinates of the extreme point based on the curve; S6: Calculate the actual tidal volume, respiratory rate, and inspiratory-to-expiratory ratio based on the coordinate point location, and compare the obtained values ​​with the standard values.

[0026] In the above method, the respiratory rate of the respiratory simulator is set. According to the relevant requirements of YY / T 1743-2021 "Nemesis and Respiratory Equipment Nebulization Systems and Components", the typical operating parameters of the respiratory simulator are set as follows: respiratory rate f = 15 breaths / min, inspiratory / expiratory ratio I / E = 1:1, tidal volume Vt = 500 mL. The extensometer recording software is set to take points at fixed intervals (every 0.2 seconds), recording the displacement of each time point. Testing begins, recording data for 5 motion cycles, taking points on at least one typical cycle, and observing whether there are significant changes in each motion cycle. The points are fitted into a displacement-time graph using Matlab software, and the corresponding Fourier series expression is obtained, with a goodness of fit (R-squared) not less than 0.99. Then, Matlab software is used to calculate the coordinates of three adjacent extreme values ​​(P1, P2, P3) within the fitting time, and dmax, T, and t are calculated based on these three extreme values. 呼 , t 吸 The calculation method is as follows: dmax = Max{|d1-d2|,|d3-d2|}; Vt = dmax × S; T = t3 - t1; f=60 / T t 呼 =t2-t1 (when P2 is a maximum value), t3-t2 (when P2 is a minimum value); t 吸 = t2-t1 (when P2 is a minimum), t3-t2 (when P2 is a maximum); I / E = t inhalation / t exhalation; in: dmax is the maximum displacement of the cylinder, in mm; dn, n=1,2,3, represents the displacement value at the nth extreme point; Vt is tidal volume; S is piston area, measured to be 78.5 cm²; T is the cycle time in seconds; tn, n=1,2,3, represents the time of the nth extreme point; f is respiratory rate in breaths / min; texhalation is the exhalation time in one cycle in seconds; tinhalation is the inhalation time in one cycle in seconds.

[0027] Based on the time-displacement sampling diagram of the actual sampling points, and based on the simulation of the sampling points, as follows: Figure 7 The sample curve shown is fitted using the following formula: d=-30.7486-0.0396*cos(t*0.7671)-0.2212*sin(t*0.7671)-30.1262*cos(2*t*0.7671)-2.3469*sin(2*t*0.7671); Calculate based on the fitted sample curve Figure 7 The coordinates of the extreme points P1, P2, and P3 are P1 (18.4806, -0.75061), P2 (20.5254, -60.9181), and P3 (22.575, -0.31162), respectively. The mean value of the curve is obtained by repeating the process three times. Figure 8 The results table shown indicates that if the relative deviations between the actual calculated values ​​and the set values ​​of parameters such as tidal volume (Vt), respiratory rate (f), and I / E meet the acceptance requirements according to the set deviation threshold, then the respiratory simulator method is confirmed to be successful; otherwise, it is not successful.

[0028] The present invention provides a method for fitting a breathing simulator. In step S1, when the fluid injection or extraction fails to reset the sealing plate 203, the drive rod 204 is reset. Excess or insufficient fluid in the active cavity is collected or supplied by the overflow box 209, as described in Embodiment 1.

[0029] 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 technical principles 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 respiratory simulator fitting test device, characterized in that, The device includes a frame (1) and an extensometer (3). A composite cylinder (2) is installed inside the frame (1). The composite cylinder (2) includes a housing (201). The housing (201) is composed of two adjacent hollow cylindrical bodies. A T-shaped partition (202) is provided in the middle of the cavity of the housing (201). Sealing plates (203) are rotatably provided inside the housing (201) and at the center of the two cylinders. The ends of the T-shaped partition (202) and the rotating shafts of the two sealing plates (203) are sealed together. The two sealing plates (203) and the T-shaped partition (202) are sealed together. The partition (202) forms a first driving cavity, a second driving cavity, and a movable cavity in the outer shell (201). A driving rod (204) is slidably arranged on the outer shell (201). The lower end of the driving rod (204) is located inside the movable cavity and is sealed to the movable cavity. Two connecting pipes (205) are also installed on the outer shell (201) and are respectively connected to the first driving cavity and the second driving cavity. Both connecting pipes (205) are configured to extract or send fluid. The upper end of the driving rod (204) and the movable end of the extensometer (3) are connected by a connecting rope (4). An overflow box (209) is provided on the side of the outer shell (201), a valve plate (210) is provided inside the overflow box (209), an overflow pipe (211) is provided on the outer shell (201) for connecting the movable cavity and the overflow box (209), and an overflow valve is also provided on the overflow pipe (211); The two cylinders used to form the outer shell (201) have different inner diameters.

2. The breathing simulator fitting test device according to claim 1, characterized in that, The upper end of the outer shell (201) is provided with a sleeve (206), and the upper end of the drive rod (204) is provided with a piston plate (207) that can move inside the sleeve (206). A connecting rod (208) is provided on the piston plate (207) for connecting the connecting rope (4).

3. The breathing simulator fitting test device according to claim 1, characterized in that, The cavity of the outer shell (201) is also equipped with several blocks (212), which are located on the front and rear paths of the two sealing plates (203) within their range of motion.

4. The breathing simulator fitting test device according to claim 1, characterized in that, The first driving cavity, the second driving cavity, and the movable cavity are all filled with oil.

5. A breathing simulator fitting test device according to any one of claims 1-4, wherein a linear motion module (5) is further provided inside the frame (1), and the movable end of the linear motion module (5) is fixedly connected to the end of the drive rod (204).

6. A method for fitting a breathing simulator, using the fitting test apparatus described in claim 5, characterized in that, The method includes the following steps: S1: Reset the composite cylinder (2) and extensometer (3), and ensure that the connecting rope (4) is connected between the extensometer (3) and the composite cylinder (2); S2: Inject fluid into the first drive chamber, the sealing plate (203) compresses the movable cavity to make the drive rod (204) rise. After the drive rod (204) approaches the upper position, maintain the injection speed of the first drive chamber and slowly extract the fluid from the second drive chamber until the sealing plate (203) in the first drive chamber moves to the limit position. Then the first drive chamber and the second drive chamber stop injecting and extracting fluid. S3: Fluid is extracted into the first drive chamber. The sealing plate (203) evacuates the movable cavity to make the drive rod (204) descend. After the drive rod (204) approaches the lower position, the extraction speed of the first drive chamber is maintained, and fluid is slowly injected into the second drive chamber until the sealing plate (203) in the first drive chamber moves to the limit position. Then the extraction and injection of fluid in the first and second drive chambers stop. S4: Repeat steps S2-S3, recording the position change of the extensometer (3) at 0.2s time intervals; S5: Fit the time-displacement curve equation based on the time and the position change of the extensometer (3), and calculate the coordinates of the extreme point based on the curve; S6: Calculate the actual tidal volume, respiratory rate, and inspiratory-to-expiratory ratio based on the coordinate point location, and compare the obtained values ​​with the standard values.

7. The method for fitting a breathing simulator according to claim 6, characterized in that, In step S1, when the fluid injection or extraction fails to reset the sealing plate (203), the drive rod (204) is reset, and excess or insufficient fluid in the active cavity is collected or supplied by the overflow box (209).

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