Lung dispersion testing equipment

Abstract

The embodiment of the invention belongs to the technical field of medical instruments, and relates to lung dispersion test equipment which comprises a dispersion host, a gas analysis module, a standard gas cylinder, a test gas circuit, a standard calibration gas circuit and a gain calibration gas circuit, the gas analysis module is arranged in the dispersion host; the first ends of the test gas circuit, the standard calibration gas circuit and the gain calibration gas circuit are communicated to the standard gas cylinder, the second ends of the test gas circuit and the standard calibration gas circuit are communicated with the gas analysis module through the balance pipe, the main body of the gain calibration gas circuit is arranged in the dispersion host, and the second end of the gain calibration gas circuit is directly communicated with the gas analysis module; the first end is close to the standard gas cylinder, and the second end is far away from the standard gas cylinder. According to the technical scheme provided by the invention, when the environment temperature and humidity change greatly, automatic calibration can be realized through the gain calibration gas circuit, so that the gas precision in the test process is ensured, and the accuracy of a test result is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and more specifically, to a lung diffusion testing device. Background Art

[0002] The Diffusing Capacity of the Lungs for Carbon Monoxide (DLCO) test is usually performed on a desktop spirometer with a fast-response gas analysis system. Figure 1 As shown, Figure 1 This is a structural diagram of an existing desktop pulmonary function instrument. Figure 1 In addition to the gas analysis module, the desktop pulmonary function instrument usually has a trolley, a respiratory flow acquisition module, an environmental monitoring module (not shown), a standard gas cylinder, a control host and a host computer, etc. Among them, the gas analysis module is set in the control host, and the sampling end of the gas analysis module is connected to the sampling joint (not shown) set on the trolley support arm and the respiratory interface through a balance tube, which is used to measure the carbon monoxide concentration in the inhaled and exhaled gas of the subject.

[0003] At present, the gas analysis module usually adopts non-dispersive infrared (NDIR) technology, which can respond quickly and continuously record gas concentration. The detection accuracy of the NDIR module is greatly affected by environmental parameters, such as changes in temperature and humidity. Therefore, the gas analysis module needs to be calibrated with standard concentration gas at least 1-2 times a day to make the gas concentration value output by the gas analysis module consistent with the concentration value of the standard concentration gas, that is, to achieve gain calibration. However, the calibration gas path of the gas analysis module on the existing desktop spirometer passes through the support arm of the trolley, and the calibration gas path needs to be connected to the gas analysis module through a balance tube, which makes the calibration gas path too long. When calibrating the gas analysis module, in addition to calibrating the gas concentration measured by the gas analyzer to the set concentration value through gain calibration, it is also necessary to take into account the delay time of the measured gas from the sampling end of the balance tube to the NDIR module, as well as the final concentration calculation and qualified verification, which makes the entire gas calibration process take nearly 3 minutes.

[0004] This calibration process takes too long, which means that when environmental parameters change significantly and gain calibration of the gas analysis module is required, the clinical test time will inevitably be too long, affecting the efficiency of the lung diffusion test. If the gain calibration is not performed in time, the gas detection accuracy of the gas analysis module may be reduced, affecting the test accuracy. Summary of the invention

[0005] The technical problems to be solved by the embodiments of the present application are how to reduce the time spent on gain calibration of the gas analysis module of the lung diffusion test equipment, and to solve technical problems such as the impact on the accuracy and precision of the gas test results when the ambient temperature and humidity change.

[0006] In order to solve the above technical problems, the present application embodiment provides a lung diffusion test device, which adopts the following technical solution: Dispersion host, gas analysis module, standard gas cylinder and gas circuit module. The gas circuit module includes test gas circuit, standard calibration gas circuit, gain calibration gas circuit and balance tube; The gas analysis module is arranged in the diffusion host; The first ends of the test gas circuit, the standard calibration gas circuit and the gain calibration gas circuit are all connected to the standard gas cylinder, the second ends of the test gas circuit and the standard calibration gas circuit are connected to the gas analysis module through a balance pipe, the main body of the gain calibration gas circuit is arranged in the diffusion host and the second end of the gain calibration gas circuit is directly connected to the gas analysis module, the first end is the end close to the standard gas cylinder, and the second end is the end far from the standard gas cylinder; The standard calibration gas path is used for gain calibration and delay time calibration, and the gain calibration gas path is only used for gain calibration.

[0007] In some possible implementations, the gain calibration gas circuit includes an equivalent gas resistor, and the gas resistance value of the equivalent gas resistor is equivalent to the resistance value of the balance tube.

[0008] In some possible implementations, the standard calibration gas circuit and the gain calibration gas circuit include a two-position two-way solenoid valve, a flow control air resistor, a sampling port and an exhaust port of the same model; the exhaust ports of the standard calibration gas circuit and the gain calibration gas circuit are both connected to the air; the sampling port of the standard calibration gas circuit is used to connect to the first end of the balancing tube, and the sampling port of the gain calibration gas circuit is used to connect to the first end of the equivalent air resistor.

[0009] In some possible implementations, the gas circuit module includes a two-position three-way solenoid valve, the second end of the balance tube and the equivalent gas resistance is respectively connected to one of the two inlet ends of the two-position three-way solenoid valve, and the outlet end of the two-position three-way solenoid valve is connected to the gas analysis module.

[0010] In some possible implementations, the pulmonary diffusion test equipment also includes a pressure stabilizing module, which includes a pressure reducer and a pressure sensor. The pressure stabilizing module is arranged at the outlet end of the standard gas cylinder. The output airflow of the standard gas cylinder selectively enters the first end of the test gas circuit, the standard calibration gas circuit or the gain calibration gas circuit after passing through the pressure stabilizing module.

[0011] In some possible implementations, the pressure stabilization module includes a filter and a one-way valve.

[0012] In some possible implementations, the pressure stabilizing module further includes a pressure reducing valve, and the output gas flow of the standard gas cylinder selectively enters the first end of the standard calibration gas circuit or the gain calibration gas circuit after flowing through the pressure reducer, the pressure sensor and the pressure reducing valve.

[0013] In some possible implementations, the lung diffusion test equipment also includes a host computer, which is connected to a diffusion host. The host computer is used to send gas path switching instructions to the diffusion host, and the diffusion host is used to switch the test gas path, standard calibration gas path and gain calibration gas path according to the control instructions.

[0014] In some possible implementations, the host computer is used to periodically display a gas gain calibration prompt to instruct the user to automatically perform gain calibration on the gas analysis module through the gain calibration gas path.

[0015] In some possible implementations, the lung diffusion test device further includes an environment monitoring module, and the host computer is further configured to perform the following steps: When performing gas calibration or gain calibration on the gas analysis module, recording the first environmental temperature and humidity data during calibration through the environmental monitoring module; Acquire the current second environment temperature and humidity data through the environment monitoring module; Determine whether the difference between the first ambient temperature and humidity data and the second ambient temperature and humidity data exceeds a preset threshold; If it exceeds, a calibration prompt is generated to instruct the user to perform a gain calibration instruction on the gas analysis module.

[0016] Compared with the prior art, the embodiments of the present application have the following beneficial effects: The lung diffusion test device of this embodiment introduces a newly added gain calibration gas circuit, the main body of which can be set in the diffusion host. Compared with the conventional standard calibration gas circuit, the distance between the gas circuit sampling end and the gas analysis module can be greatly reduced, and there is no need to consider the delay time calibration, which reduces the calibration time. Therefore, when the environmental parameters change greatly, the operator can use the gain calibration gas circuit to perform gain calibration on the gas analysis module in a timely manner, thereby ensuring the gas accuracy during the test and improving the efficiency and accuracy of the lung diffusion test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the solutions in the present application or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Shown is a schematic diagram of the structure of an existing desktop pulmonary function instrument; Figure 2 The structure diagram of an embodiment of a lung diffusion test device 200 of the present application is shown; Figure 3 Shown is a schematic diagram of a specific embodiment of the lung diffusion test device 200 of the present application; Figure 4 Shown is a schematic diagram of another specific embodiment of the lung diffusion test device 200 of the present application; Figure 5 It is a flowchart of the method executed by the lung diffusion testing device 200 of the present application. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0020] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, left, right, front, back, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0023] In the description of this application, it should be noted that, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution. In addition, the identification of specific steps below does not represent a limitation on the order of steps and execution logic. The execution order and execution logic between each step should be understood and inferred with reference to the contents described in the embodiment.

[0024] The concepts involved in the embodiments of the present application are further described below: Pulmonary diffusion function: refers to the ability of a certain alveolar gas to diffuse from the alveoli to the capillaries into the blood through the alveolar-capillary membrane and bind to hemoglobin (Hb) in red blood cells. The gases exchanged in the alveolar-capillary membrane are mainly oxygen (O2) and carbon dioxide (CO2). Since the method of directly calculating the diffusion capacity of oxygen is complicated; and the binding force of carbon monoxide (CO) to hemoglobin is 210 times greater than that of oxygen, and except for heavy smokers, the carbon monoxide content in normal human plasma is almost zero, it is easy to calculate the carbon monoxide intake during the examination; in addition, carbon monoxide rarely dissolves in plasma during the transport process, so DLCO is currently used to test the pulmonary diffusion function.

[0025] DLCO test: measures the efficiency of gas exchange in the lungs based on the ability of carbon monoxide (CO) to pass through the alveolar-capillary membrane. This test is often used to diagnose and monitor certain respiratory diseases, such as interstitial lung disease, emphysema, etc. During the DLCO test, the patient inhales a gas containing a certain concentration of carbon monoxide and then exhales the gas. By measuring the change in the concentration of carbon monoxide in the exhaled gas, the diffusion capacity of carbon monoxide is calculated, thereby inferring the functional status of pulmonary gas exchange. This method takes advantage of the high affinity of carbon monoxide to hemoglobin, making carbon monoxide an ideal gas for assessing the diffusion function of the lungs.

[0026] NDIR gas detection technology: It is a detection method based on gas absorption theory. Its basic principle is to use the absorption characteristics of different gases to infrared light of specific wavelengths to identify and measure the concentration of gas. Each gas has its own unique absorption spectrum, that is, it only absorbs within a specific infrared wavelength range. Therefore, by measuring the absorption degree of the gas sample to these specific wavelengths of infrared light, the concentration of the gas can be calculated.

[0027] NDIR gas detection module: usually includes an infrared light source, an air chamber and an infrared detector. The infrared light source is used to emit infrared light of a specific frequency, and shines on the infrared detector after passing through the air chamber; the air chamber is used to pass the gas to be tested; the infrared detector is used to sense the change in the intensity of the infrared light after passing through the air chamber. When the gas to be tested contains a target gas component that can absorb the infrared light of the specific frequency, the infrared light of the specific frequency will be lost due to absorption after passing through the air chamber. Therefore, whether the gas to be tested contains a target gas component that can absorb the infrared light of the specific frequency, and the concentration of the target gas component is different, will cause the infrared detector to have different output results, and the output result is mapped to the concentration of the target gas component in the gas to be tested. The mapping relationship is based on the Lambert-Beer law and combined with the system design. Therefore, by obtaining the output value of the infrared detector and substituting it into the mapping relationship, the concentration of the target gas component can be determined.

[0028] Gain calibration of gas analysis module: The mapping relationship of the above NDIR module is usually expressed in the form of a function formula, which contains multiple parameters. The values ​​of these multiple parameters need to be calibrated by using standard gas with known target gas component concentration to calibrate the NDIR module, which is also called gain calibration. Since the humidity of the environment will affect the absorption of infrared light by the gas in the air chamber, and the temperature will affect the output value of the infrared detector (currently pyroelectric or thermopile infrared detectors are mostly used), the detection accuracy of the NDIR module is greatly affected by the temperature and humidity of the environment. Therefore, for the sake of the measurement accuracy of the NDIR module, it is very necessary to perform gain calibration on the NDIR module in a timely manner when the temperature and humidity of the environment fluctuate.

[0029] The following is a further description of the background involved in the embodiments of the present application: Among them, in the existing lung diffusion test equipment, in order to facilitate the use of the subjects and consider the aesthetics of the structural design, the control host where the gas analysis module is located is usually separated from the subject's breathing interface (disposable mouthpiece) by a long distance, such as Figure 1 As shown, the user breathing interface of the desktop spirometer is arranged on the trolley support arm, and the control host is fixed on the trolley. In this way, when performing a pulmonary diffusion test, in order to facilitate the gas analysis module to obtain the exhaled air of the subject at the breathing interface, it is necessary to use a balance tube to connect the sampling connector at the breathing interface (arranged on the pipeline of the breathing interface and the flow sensor, not shown) to the gas analysis module. At this time, the exhaled gas of the subject needs to pass through the balance tube to reach the gas analysis module, and the length of the balance tube is usually long. For example, the balance tube length of some desktop spirometers can reach 1m. This structural design is bound to cause the exhaled airflow of the subject to flow in the air path for too long, making the concentration measurement response of the gas analysis module significantly slower than the airflow output end.

[0030] Therefore, in addition to gain calibration, the calibration gas path for the gas analysis module on the existing lung diffusion test equipment usually needs to implement delay time calibration. Delay time calibration refers to calibrating and determining the flow time of the airflow from the sampling end of the balance tube (i.e., the sampling joint) to the gas analysis module.

[0031] Based on this, the diffusion test gas circuit and the calibration gas circuit of the lung diffusion test device are usually set at basically the same position on the lung diffusion test device, and the diffusion test gas circuit and the calibration gas circuit can be connected to the gas analysis module using a balance tube of the same length or the same balance tube. Figure 1 As shown, the sampling connector of the diffusion test gas circuit (arranged on the pipeline of the breathing interface and the flow sensor, not shown) and the calibration gas circuit interface of the calibration gas circuit are both located on the trolley support arm. When performing a lung diffusion test, the inlet end of the balance tube is connected to the sampling connector, and when performing a standard calibration, the inlet end of the balance tube is connected to the calibration gas circuit interface of the calibration gas circuit. In this way, the distance between the calibration gas circuit interface of the calibration gas circuit and the gas analysis module is basically the same as the distance between the sampling connector and the gas analysis module, so that the delay time calibration for the lung diffusion test gas circuit can be indirectly achieved by using a standard calibration gas circuit. The delay time calibration needs to be analyzed based on the curve output by the gas analysis module, and the details will not be elaborated here.

[0032] However, the delay time calibration takes a long time, which makes the overall time of gain calibration using the existing calibration gas path too long. Therefore, when the environment changes greatly and the gain calibration of the gas analysis module is required, the use of the existing calibration gas path for calibration will inevitably lead to a long clinical test time and affect the efficiency of lung diffusion test.

[0033] Based on the above technical problems, further explanation is given below based on the accompanying drawings.

[0034] Specific reference Figure 2 , Figure 2 The structure diagram of an embodiment of the lung diffusion test device 200 of the present application is shown. The lung diffusion test device 200 includes: Dispersion host 1, gas analysis module 2, standard gas bottle 3, test gas circuit 4, standard calibration gas circuit 5, gain calibration gas circuit 6 and balance tube 7; The gas analysis module 2 is arranged in the diffusion host 1; The first ends of the test gas circuit 4, the standard calibration gas circuit 5 and the gain calibration gas circuit 6 are all connected to the standard gas cylinder 3, and the second ends of the test gas circuit 4 and the standard calibration gas circuit 5 are connected to the gas analysis module 2 through the balance pipe 7. The main body of the gain calibration gas circuit 6 is arranged in the diffusion host 1 and the second end of the gain calibration gas circuit 6 is directly connected to the gas analysis module 2 without passing through the balance pipe 7. The first end is the end close to the standard gas cylinder 3, and the second end is the end away from the standard gas cylinder 3; The standard calibration gas circuit 5 is used for gain calibration and delay time calibration, and the gain calibration gas circuit 6 is only used for gain calibration.

[0035] In this embodiment, the first end and the second end are respectively an end close to the standard gas bottle 3 and an end far away from the standard gas bottle 3 in the airflow direction of the standard gas bottle 3 .

[0036] The diffusion host 1 is the control center of the lung diffusion test function. The diffusion host 1 can be provided with a controller, which can be a micro controller unit (MCU), which is electrically connected to the gas analysis module 2, the standard gas cylinder 3 and the electronic control devices in the gas circuit module, such as various valves, motors and switches, to realize clinical testing of the lung diffusion function and calibration of the gas analysis module 2.

[0037] The gas analysis module 2 can mainly include components such as NDIR components, sampling pumps, gas containers and drying tubes. The sampling pump is located at the end of the gas path. The gas to be tested drawn from the gas path first enters the drying tube for drying treatment, and then enters the NDIR module. The NDIR module performs concentration analysis on some gas components in the gas to be tested entering the gas analysis module 2, such as carbon monoxide and methane, and can upload them to the host computer. The gas container is used to reduce the pressure fluctuations caused by the sampling pump. The basic structure and principle of the NDIR module can refer to the above description, and no further elaboration is made here.

[0038] The standard gas cylinder 3 stores a mixed gas of standard concentration, which usually contains 0.3% carbon monoxide, 10% helium or methane as a tracer gas, and 21% oxygen and nitrogen.

[0039] The test gas circuit 4 is used to realize the lung diffusion function. Its first end is connected to the standard gas bottle 3, and its second end is connected to a disposable mouthpiece and is provided with a sampling connector. During the subject's inhalation phase, the subject inhales a mixed gas of standard concentration from the standard gas bottle 3 through the test gas circuit 4; after that, the subject holds his breath for a set time and then exhales, and the gas analysis module 2 turns on the sampling pump to inhale the exhaled gas from the sampling connector through the balance tube 7 and perform concentration detection.

[0040] The standard calibration gas circuit 5 is equivalent to the standard gas circuit in the existing lung diffusion test equipment, and its first end is connected to the standard gas cylinder 3, and the second end is connected to the gas analysis module 2 through a balance tube 7 of the same length or the same root as the test gas circuit 4. The distance between the second end of the standard calibration gas circuit 5 and the gas analysis module 2 is basically the same as the distance between the sampling connector of the test gas circuit 4 and the gas analysis module 2, so it is used for gain calibration and delay time calibration. Among them, the relevant concepts of gain calibration and delay time calibration refer to the above content and will not be repeated here.

[0041] The gain calibration gas circuit 6 is a newly added calibration gas circuit, and its gas circuit body is arranged in the diffusion host 1. Therefore, the first end of the gain calibration gas circuit 6 is connected to the standard gas bottle 3, and the second end can be directly connected to the gas analysis module 2 without passing through the balance pipe 7, thereby greatly reducing the length of the gain calibration gas circuit 6. Since the sampling end of the gain calibration gas circuit 6 is short from the gas analysis module 2, when the gain calibration gas circuit 6 is used to calibrate the gas analysis module 2, there is no need to consider the delay caused by the flow time of the airflow in the pipeline, and only the gain calibration of the gas analysis module 2 is realized. It has been verified in practice that the gain calibration time can be controlled to 4s by using the gain calibration gas circuit 6 for calibration.

[0042] Compared with the prior art, the embodiments of the present application have the following beneficial effects: The lung diffusion test device 200 of this embodiment introduces a newly added gain calibration gas circuit 6, the main body of which can be set in the diffusion host 1. Compared with the conventional standard calibration gas circuit 5, the distance between the gas circuit sampling end and the gas analysis module 2 can be greatly reduced, and there is no need to consider the delay time calibration, thereby reducing the calibration time. Therefore, when the environmental parameters change greatly, the operator can use the gain calibration gas circuit 6 to perform gain calibration on the gas analysis module 2 in a timely manner, thereby ensuring the gas accuracy during the test and improving the efficiency and accuracy of the lung diffusion test.

[0043] The lung diffusion test device 200 of the present application is described below with a specific embodiment. Figure 3 , Figure 3 It is a schematic diagram of the design of a specific embodiment of the lung diffusion testing device 200 of the present application.

[0044] In this specific embodiment, Figure 3 As shown, the above-mentioned test gas circuit 4 may include components such as a demand valve 41, a three-way valve 42, a flow sensor 43, a sampling connector 44 and a disposable mouthpiece 45, and each component is connected in sequence by a connecting air pipe. Among them, the demand valve 41 is used to provide a certain flow of standard gas according to the negative pressure of inspiration; the balance tube 7 is used to balance the gas in the tube 7 with the water vapor humidity of the ambient gas; the three-way valve 42 is used for switching between the ventilation test and the diffusion test function; the flow sensor 43 can be a screen-type pressure difference or an ultrasonic flow sensor, which is used to detect the respiratory airflow flow of the subject; the sampling connector 44 is formed into a tubular structure of three connectors, which is connected in series in the gas circuit and is used to connect with the balance tube 7; the disposable mouthpiece 45 is used to avoid cross infection and play a filtering role. The first end of the test gas circuit 4 is specifically the inlet end of the demand valve 41, and the second end of the test gas circuit 4 is specifically the outlet end of the sampling connector 44.

[0045] When performing a lung diffusion test, the operator can use a balance tube 7 to connect the sampling connector 44 and the gas analysis module 2, and set the lung diffusion test gas path 4 to be in a connected state with the standard gas bottle 3, while the other two gas paths mentioned above are in a blocked state. Specifically, when the subject inhales, the standard gas bottle 3 and the on-demand valve 41 are opened, and the three-way valve 42 is connected to the on-demand valve 41. At this time, the subject inhales the mixed gas output by the standard gas bottle 3 through the disposable mouthpiece 45; after that, the subject holds his breath for a set time and then exhales. At this time, the standard gas bottle 3 and the on-demand valve 41 can be closed, and the three-way valve 42 is turned to be connected to the air. The user exhales the gas, and the gas analysis module 2 turns on the sampling pump to inhale the gas exhaled by the subject from the sampling connector 44 through the balance tube 7 and perform concentration detection.

[0046] In this specific embodiment, specific reference is made to Figure 3 , the gain calibration gas circuit 6 includes an equivalent gas resistance member 65, which can be a tubular component with a mesh structure or other gas resistance structure inside, and the gas resistance value of the equivalent gas resistance member 65 is equivalent to the gas resistance value of the balance tube 7, and equivalence means that the gas resistance values ​​of the two are equal or the difference between the gas resistance values ​​of the two is within an allowable range. Since the air flow rate will also have a certain impact on the test of the gas analysis module 2, this design can make the gain calibration gas circuit 6 and the standard calibration gas circuit 5 consistent with the basic structural factors in the gain calibration, thereby ensuring that the equivalent gas resistance member 65 and the balance tube 7, respectively, the second end, that is, the sampling end, of the sample gas flow rate is kept consistent as much as possible, avoiding the problem that the gain calibration results of the two may be different due to the different gas resistances of the gain calibration gas circuit 6 and the standard calibration gas circuit 5.

[0047] In this specific embodiment, the standard calibration gas circuit 5 and the gain calibration gas circuit 6 include a two-position two-way solenoid valve, a flow control air resistor, a sampling port and an exhaust port of the same model. The exhaust ports of the standard calibration gas circuit 5 and the gain calibration gas circuit 6 are both connected to the air. The sampling port of the standard calibration gas circuit 5 is used to connect to the first end of the balance tube 7, and the sampling port of the gain calibration gas circuit 6 is used to connect to the first end of the equivalent air resistor 65.

[0048] Specifically, refer to Figure 3, the standard calibration gas circuit 5 may be provided with a first solenoid valve 51, a first flow control air resistor 52, a first sampling port 53 and a first exhaust port 54 in sequence in the direction of airflow, and the gain calibration gas circuit 6 may be provided with a second solenoid valve 61, a second flow control air resistor 62, a second sampling port 63 and a second exhaust port 64 in sequence in the direction of airflow. Among them, the first solenoid valve 51 and the second solenoid valve 61 may both be two-position two-way solenoid valves, the first exhaust port 54 and the second exhaust port 64 are both connected to the air, the first sampling port 53 is used to connect to the balance pipe 7, and the second sampling port 63 is connected to the first end of the above-mentioned equivalent air resistor 65. By adopting the flow control air resistor, the output airflow rate can be controlled, and the excess gas is discharged through the exhaust port.

[0049] In this specific embodiment, the gain calibration gas circuit 6 also includes a two-position three-way solenoid valve 66, the second end of the balance tube 7 and the equivalent gas resistance 65 are respectively connected to one of the two inlet ends of the two-position three-way solenoid valve 66, and the outlet end of the two-position three-way solenoid valve is connected to the gas analysis module 2.

[0050] Specifically, refer to Figure 3 The inlet end of the connection of the balance pipe 7 is in a normally open state, and the inlet end of the connection of the equivalent gas resistance 65 is in a normally closed state. The switching state of the two-position three-way solenoid valve 66 can be controlled to achieve switching of different gas circuits.

[0051] In this specific embodiment, the pulmonary diffusion test equipment 200 also includes a pressure stabilizing module 8, which includes a pressure reducer 81 and a pressure sensor 82. The pressure stabilizing module 8 is arranged at the outlet end of the standard gas cylinder 3. The output airflow of the standard gas cylinder 3 selectively enters the first end of the test gas circuit 4, the standard calibration gas circuit 5 or the gain calibration gas circuit 6 after passing through the pressure stabilizing module 8.

[0052] Specifically, refer to Figure 3 As shown, the pressure reducer 81 and the pressure sensor 82 are arranged in sequence according to the direction of air flow. The pressure reducer 81 is used to convert the high-pressure gas in the bottle into low-pressure gas for output, and the pressure sensor 82 can monitor the pipeline air pressure in real time and upload it to the diffusion host 1. The diffusion host 1 can control the pressure reducer 81 to reduce pressure in real time according to the detected pressure value, thereby ensuring the stability of the gas circuit pressure.

[0053] In this specific embodiment, the pressure stabilizing module 8 includes a filter screen 83 and a one-way valve 84 .

[0054] Specifically, refer to Figure 3 A filter 83 and a one-way valve 84 may be provided between the pressure reducer 81 and the pressure sensor 82. The filter 83 may filter the input gas to prevent particles from entering the airway, and the one-way valve 84 is used to prevent gas backflow.

[0055] In this specific embodiment, the pressure stabilizing module 8 also includes a pressure reducing valve 85. After the output airflow of the standard gas bottle 3 flows through the pressure reducer 81, the pressure sensor 82 and the pressure reducing valve 85, it selectively enters the first end of the standard calibration gas circuit 5 or the gain calibration gas circuit 6.

[0056] Specifically, refer to Figure 3 According to the flow direction of the gas flow, a pressure reducing valve 85 may be further arranged behind the pressure sensor 82. The pressure reducing valve 85 is arranged at the input end of the standard calibration gas circuit 5 and the gain calibration gas circuit 6, and may further control the output pressure of the calibration gas.

[0057] In this specific embodiment, the voltage stabilizing module 8 can also be disposed as a whole in the diffusion host 1 to improve the integration of the system and reduce the size of the device.

[0058] exist Figure 2 or Figure 3 Based on the embodiment shown, specific reference is made to Figure 4 , Figure 4 It is a schematic diagram of the design of another specific embodiment of the lung diffusion testing device 200 of the present application.

[0059] In this specific embodiment, the lung diffusion test equipment 200 also includes a host computer 9, which is connected to the diffusion host 1. The host computer 9 is used to send gas path switching instructions to the diffusion host 1, and the diffusion host 1 is used to switch the test gas path 4, the standard calibration gas path 5 and the gain calibration gas path 6 according to the control instructions.

[0060] In this specific embodiment, the host computer 9 is used to periodically display a gas gain calibration prompt to instruct the user to perform automatic gain calibration on the gas analysis module 2 through the gain calibration gas circuit 6 .

[0061] Specifically, this function is set as a check option in the interface of the host computer 9, and the user can check it according to the local climate difference requirements. Since the lung diffusion test device 200 of the present application introduces a new gain calibration gas circuit 6, which reduces the time consumption of gain calibration, the host computer 9 can be used to provide a timed reminder to instruct the user to perform automatic gain calibration on the gas analysis module 2 at a regular time to improve the measurement accuracy of the gas analysis module 2.

[0062] In this specific embodiment, further specific reference is made to Figure 4 and Figure 5 ,in Figure 5 The figure is a flow chart of the method executed by the lung diffusion test device 200 of the present application. The lung diffusion test device 200 may further include an environment monitoring module 10. The host computer 9 of the lung diffusion test device 200 is also used to execute the following steps: S501, when performing gas calibration or gain calibration on the gas analysis module 2, recording first environmental temperature and humidity data during calibration through the environmental monitoring module 10; S502, obtaining current second environment temperature and humidity data through the environment monitoring module 10; S503, determining whether the difference between the first ambient temperature and humidity data and the second ambient temperature and humidity data exceeds a preset threshold; S504 , if exceeded, a calibration prompt is generated to instruct the user to execute a gain calibration instruction on the gas analysis module 2 .

[0063] Specifically, based on the foregoing description, environmental parameters have a greater impact on the measurement accuracy of the gas analysis module 2. If the gain calibration of the gas analysis module 2 is frequently performed, the test efficiency will be reduced. Moreover, if the environmental parameters do not change much, frequent gain calibration may not improve the accuracy and may also result in a waste of standard gas.

[0064] Therefore, a preset threshold value of environmental parameter change can be set based on the test data, and the preset threshold value is considered to significantly affect the measurement accuracy of the gas analysis module 2. Furthermore, each time the gain calibration is performed on the gas analysis module 2, the first environmental temperature and humidity data during calibration can be acquired and recorded through the environmental monitoring module 10. After that, the environmental parameters are continuously monitored. When the difference between the current second environmental temperature and humidity data and the first environmental temperature and humidity data exceeds the preset threshold value, a calibration prompt is generated by the host computer 9, instructing the user to issue a gain calibration instruction to the gas analysis module 2 in a timely manner to avoid the influence of excessive changes in environmental parameters on the accuracy of the gas analysis module 2.

[0065] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A lung diffusion test device, characterized in that: include: Dispersion host, gas analysis module, standard gas bottle, test gas circuit, standard calibration gas circuit, gain calibration gas circuit and balance tube; The gas analysis module is arranged in the diffusion host; The first ends of the test gas circuit, the standard calibration gas circuit and the gain calibration gas circuit are all connected to the standard gas cylinder, and the second ends of the test gas circuit and the standard calibration gas circuit are both connected to the gas analysis module through the balance pipe. The main body of the gain calibration gas circuit is arranged in the diffusion host and the second end of the gain calibration gas circuit is directly connected to the gas analysis module, the first end is an end close to the standard gas cylinder, and the second end is an end away from the standard gas cylinder; The standard calibration gas circuit is used for gain calibration and delay time calibration, and the gain calibration gas circuit is only used for gain calibration.

2. The lung diffusion test device according to claim 1, characterized in that: The gain calibration gas circuit includes an equivalent gas resistance component, and the gas resistance value of the equivalent gas resistance component is equivalent to the resistance value of the balance tube.

3. The lung diffusion test device according to claim 2, characterized in that: The standard calibration gas circuit and the gain calibration gas circuit include a two-position two-way solenoid valve, a flow control air resistor, a sampling port and an exhaust port of the same model; the exhaust ports of the standard calibration gas circuit and the gain calibration gas circuit are both connected to the air; the sampling port of the standard calibration gas circuit is used to be connected to the first end of the balancing tube, and the sampling port of the gain calibration gas circuit is used to be connected to the first end of the equivalent air resistor.

4. The lung diffusion test device according to claim 3, characterized in that: The gain calibration gas circuit also includes a two-position three-way solenoid valve, the second end of the balance tube and the equivalent gas resistance is respectively connected to one of the two inlet ends of the two-position three-way solenoid valve, and the outlet end of the two-position three-way solenoid valve is connected to the gas analysis module.

5. The lung diffusion test device according to claim 4, characterized in that: The pulmonary diffusion test equipment also includes a pressure stabilizing module, which includes a pressure reducer and a pressure sensor. The pressure stabilizing module is arranged at the outlet end of the standard gas cylinder. The output airflow of the standard gas cylinder selectively enters the test gas circuit, the standard calibration gas circuit or the first end of the gain calibration gas circuit after flowing through the pressure stabilizing module.

6. The lung diffusion test device according to claim 5, characterized in that: The pressure stabilizing module also includes a filter screen and a one-way valve.

7. The lung diffusion test device according to claim 6, characterized in that: The pressure stabilizing module also includes a pressure reducing valve. After the output airflow of the standard gas bottle flows through the pressure reducer, the pressure sensor and the pressure reducing valve, it selectively enters the first end of the standard calibration gas circuit or the gain calibration gas circuit.

8. The lung diffusion test device according to claim 4, characterized in that: The lung diffusion test device also includes a host computer, which is connected to the diffusion host. The host computer is used to send an air path switching instruction to the diffusion host, and the diffusion host is used to switch the test air path, the standard calibration air path and the gain calibration air path according to the control instruction.

9. The lung diffusion test device according to claim 8, characterized in that: The host computer is used to periodically display a gas gain calibration prompt to instruct the user to automatically perform gain calibration on the gas analysis module through the gain calibration gas path.

10. The lung diffusion test device according to claim 8, characterized in that: The lung diffusion test device also includes an environment monitoring module, and the host computer is also used to perform the following steps: When performing gas calibration or gain calibration on the gas analysis module, recording first environmental temperature and humidity data during calibration through the environmental monitoring module; Acquire the current second environment temperature and humidity data through the environment monitoring module; Determine whether the difference between the first ambient temperature and humidity data and the second ambient temperature and humidity data exceeds a preset threshold; If it exceeds, a calibration prompt is generated to instruct the user to execute a gain calibration instruction for the gas analysis module.

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