A lung diffusing capacity testing device

Abstract

The embodiment of the application belongs to the technical field of medical instruments, and relates to a pulmonary diffusion test device, which comprises a diffusion host, a gas analysis module, a standard gas bottle, a test gas circuit, a standard calibration gas circuit and a gain calibration gas circuit. 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 communicated to the standard gas bottle. The second ends of the test gas circuit and the standard calibration gas circuit are both communicated to the gas analysis module through balance pipes. 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 communicated to the gas analysis module. The first end is an end close to the standard gas bottle, and the second end is an end away from the standard gas bottle. The technical scheme provided by the application can realize automatic calibration through the gain calibration gas circuit when the environmental temperature and humidity change greatly, so as to ensure the gas precision in the test process and greatly improve the accuracy of the test result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and more particularly to a pulmonary diffusion test device. BACKGROUND

[0002] The pulmonary carbon monoxide diffusing capacity (DLCO) test is usually performed on a desktop pulmonary function instrument with a fast-response gas analysis system. As shown in Figure 1 , Figure 1 is a structural schematic diagram of an existing desktop pulmonary function instrument. Referring to Figure 1 , in addition to the gas analysis module 2, the desktop pulmonary function instrument also usually has a trolley, a respiratory flow acquisition module, an environmental monitoring module (not shown), a standard gas cylinder 3, a control host, and an upper computer 9. Among them, the gas analysis module 2 is arranged in the control host, and the sampling end of the gas analysis module 2 is communicated with a sampling joint (not shown) arranged at the breathing interface of the trolley support arm through a balance pipe 7, for measuring the carbon monoxide concentration in the inhaled and exhaled gas of the subject.

[0003] At present, the gas analysis module 2 usually adopts non-dispersive infrared (NDIR) technology, which can quickly respond and continuously record the gas concentration. The detection accuracy of the NDIR module is greatly affected by the changes of environmental parameters such as temperature and humidity, so the gas analysis module 2 needs to be calibrated with standard concentration gas at least once a day, so that the gas concentration value output by the gas analysis module 2 is consistent with the concentration value of the standard concentration gas, that is, the gain calibration is realized. However, the standard calibration gas path of the existing gas analysis module 2 on the desktop pulmonary function instrument needs to pass through the balance pipe 7 to communicate with the gas analysis module 2 due to the support arm of the trolley, which results in a long standard calibration gas path. When calibrating the gas analysis module 2, in addition to the need to calibrate the gas concentration measured by the gas analysis module 2 to the set concentration value through gain calibration, the delay time of the measured gas from the sampling end of the balance pipe 7 to the NDIR module also needs to be considered, as well as the final concentration calculation and qualification verification, which makes the whole gas calibration process take nearly 3 minutes.

[0004] The calibration process takes too long, so when the environmental parameters change greatly and the gain calibration of the gas analysis module 2 is needed, it will inevitably lead to a long clinical test time, affecting the efficiency of pulmonary diffusion test; and if the gain calibration is not performed in time, the gas detection accuracy of the gas analysis module 2 may be reduced, affecting the test accuracy. SUMMARY

[0005] The technical problem to be solved by the embodiments of the present application is how to reduce the long time consumption of gain calibration of a gas analysis module of a lung diffusion test device, and solve the technical problem of affecting the accuracy and precision of gas test results when the ambient temperature and humidity change.

[0006] To solve the above technical problem, the embodiments of the present application provide a lung diffusion test device, which adopts the technical scheme as follows:

[0007] The diffusion host, the gas analysis module, the standard gas bottle and the gas path module, the gas path module includes a test gas path, a standard calibration gas path, a gain calibration gas path and a balance pipe;

[0008] The gas analysis module is arranged in the diffusion host;

[0009] The first end of the test gas path, the standard calibration gas path and the gain calibration gas path are all communicated to the standard gas bottle, the second end of the test gas path and the standard calibration gas path are both communicated to the gas analysis module through the balance pipe, the main body of the gain calibration gas path is arranged in the diffusion host and the second end of the gain calibration gas path is directly communicated to the gas analysis module, the first end is the end close to the standard gas bottle, and the second end is the end away from the standard gas bottle;

[0010] 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.

[0011] In some possible implementation manners, the gain calibration gas path includes an equivalent air resistance piece, and the air resistance value of the equivalent air resistance piece is equivalent to the resistance value of the balance pipe.

[0012] In some possible implementation manners, the standard calibration gas path and the gain calibration gas path include two two-way electromagnetic valves of the same type, a flow control air resistance, a sampling port and an exhaust port, the exhaust ports of the standard calibration gas path and the gain calibration gas path are both communicated to air, the sampling port of the standard calibration gas path is used for connecting the first end of the balance pipe, and the sampling port of the gain calibration gas path is used for connecting the first end of the equivalent air resistance piece.

[0013] In some possible implementation manners, the gas path module includes a two three-way electromagnetic valve, the second ends of the balance pipe and the equivalent air resistance piece are respectively connected to one of the two inlet ends of the two three-way electromagnetic valve, and the outlet end of the two three-way electromagnetic valve is communicated to the gas analysis module.

[0014] In some possible implementation manners, the lung diffusion test device further includes a pressure stabilizing module, the pressure stabilizing module includes a pressure reducer and a pressure sensor, the pressure stabilizing module is arranged at the outlet end of the standard gas bottle, and the output gas flow of the standard gas bottle selectively enters the first end of the test gas path, the standard calibration gas path or the gain calibration gas path after flowing through the pressure stabilizing module.

[0015] In some possible implementation manners, the pressure stabilizing module includes a filter screen and a one-way valve.

[0016] In some possible implementation manners, the pressure stabilizing module further comprises a pressure reducing valve, and after the output gas flow of the standard gas cylinder flows through the pressure reducer, the pressure sensor and the pressure reducing valve, the output gas flow selectively enters the first end of the standard calibration gas path or the gain calibration gas path.

[0017] In some possible implementation manners, the lung diffusion test device further comprises a host computer, the host computer is connected with the diffusion host computer, and the host computer is configured to send a gas path switching instruction to the diffusion host computer, and the diffusion host computer is configured to switch the test gas path, the standard calibration gas path and the gain calibration gas path according to the gas path switching instruction.

[0018] In some possible implementation manners, the host computer is configured to display a gas gain calibration prompt at a time, so as to instruct a user to perform automatic gain calibration on the gas analysis module through the gain calibration gas path.

[0019] In some possible implementation manners, the lung diffusion test device further comprises an environment monitoring module, and the host computer is further configured to perform the following steps:

[0020] When the gas calibration or gain calibration is performed on the gas analysis module, first environment temperature and humidity data at the time of calibration are recorded through the environment monitoring module;

[0021] Second environment temperature and humidity data at the present time are obtained through the environment monitoring module;

[0022] It is judged whether a difference between the first environment temperature and humidity data and the second environment temperature and humidity data exceeds a preset threshold value;

[0023] If the difference exceeds the preset threshold value, a calibration prompt is generated to instruct a user to perform gain calibration on the gas analysis module.

[0024] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0025] The lung diffusion test device of the embodiments introduces a newly added gain calibration gas path, the main body of the gas path can be arranged in the diffusion host computer, and compared with the conventional standard calibration gas path, the distance between the sampling end of the gas path and the gas analysis module can be greatly reduced, the delay time calibration does not need to be considered, and the calibration time is reduced. Therefore, when the environment parameters change greatly, the operator can timely perform gain calibration on the gas analysis module through the gain calibration gas path, so as to ensure the gas precision in the test process and improve the lung diffusion test efficiency and precision. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0027] Figure 1 The structure schematic diagram of the existing desktop lung function instrument is shown.

[0028] Figure 2 The structure schematic diagram of one embodiment of the lung diffusion test device 200 of the present application is shown.

[0029] Figure 3 The design schematic diagram of one specific embodiment of the lung diffusion test device 200 of the present application is shown.

[0030] Figure 4 The design schematic diagram of another specific embodiment of the lung diffusion test device 200 of the present application is shown.

[0031] Figure 5 The flowchart of the method performed by the lung diffusion test device 200 of the present application is shown. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0033] In the description of the present application, one or more is meant to be one or more, more than two is meant to be two or more, greater than, less than, more than, etc. are understood to not include the number, above, below, etc. are understood to include the number. If it is described as first, second, it is only used to distinguish the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0034] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, left, right, front, back, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] In the description of the present application, it should be noted that, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution. In addition, the identification of the specific steps in the following does not represent the limitation of the order and execution logic of the steps, and the execution order and execution logic between the steps should be understood and inferred with reference to the content expressed in the embodiments.

[0037] The concepts related to the embodiments of the present application are further described below:

[0038] Lung Diffusing Capacity: The ability of a certain alveolar gas to diffuse from the alveoli to the capillaries through the alveolar-capillary membrane and bind to hemoglobin (Hb) in red blood cells. The main gases exchanged in the alveolar-capillary membrane are oxygen (O2) and carbon dioxide (CO2). Since the method of directly calculating the diffusion amount of oxygen is complex; and carbon monoxide (CO) has a binding force to hemoglobin 210 times greater than oxygen, and the carbon monoxide content in the blood plasma of normal people is almost zero except for heavy smokers, making it easy to calculate the uptake of carbon monoxide in the examination; in addition, carbon monoxide is extremely difficult to dissolve in blood plasma during transport, so DLCO is currently used to test lung diffusing capacity.

[0039] DLCO Test: Based on the ability of carbon monoxide (CO) to pass through the alveolar-capillary membrane to measure the efficiency of gas exchange in the lungs. This test is commonly used to diagnose and monitor certain respiratory diseases, such as interstitial lung disease, emphysema, etc. In 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 carbon monoxide concentration in the exhaled gas, the diffusion capacity of carbon monoxide is calculated, and the functional status of lung gas exchange is inferred. This method takes advantage of the high affinity of carbon monoxide for hemoglobin, making carbon monoxide an ideal gas for evaluating lung diffusing capacity.

[0040] NDIR gas detection technology: a detection method based on gas absorption theory, its basic principle is to use different gas absorption characteristics of specific wavelength infrared light to identify and measure the concentration of gas. Each gas has its unique absorption spectrum, that is, only in a specific infrared wavelength range there is absorption phenomenon. Therefore, by measuring the degree of absorption of gas samples to these specific wavelength infrared light, the concentration of gas can be calculated.

[0041] NDIR gas detection module: usually includes an infrared light source, a gas chamber and an infrared detector, the infrared light source is used to emit infrared light of a specific frequency, and the infrared light is irradiated on the infrared detector after passing through the gas chamber; the gas chamber is used to introduce the gas to be measured; the infrared detector is used to sense the change of infrared light intensity after passing through the gas chamber. When the gas to be measured contains target gas components that can absorb infrared light of a specific frequency, the infrared light of a specific frequency will be lost after passing through the gas chamber due to absorption, so whether the gas to be measured contains target gas components that can absorb infrared light of a specific frequency, and the concentration of the target gas components are different, will cause the infrared detector to have different output results, and the output results and the concentration of the target gas components in the gas to be measured are in a mapping relationship, which is obtained according to Lambert-Beer law and combined with 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.

[0042] Gain calibration of gas analysis module: the mapping relationship of the above NDIR module is usually represented by a function formula, which contains a plurality of parameters, the values of the plurality of parameters need to be calibrated by using standard gas with known target gas component concentration to obtain the NDIR module, that is, gain calibration. Because the humidity of the environment will affect the absorption of infrared light by the gas in the gas chamber, and the temperature will affect the output value of the infrared detector (currently mostly using pyroelectric or thermoelectric infrared detector), the detection accuracy of the NDIR module is greatly affected by the temperature and humidity of the environment, so it is very necessary to calibrate the gain of the NDIR module in time when the temperature and humidity of the environment fluctuate, in order to improve the measurement accuracy of the NDIR module.

[0043] The following further describes the related background of the embodiments of the present application:

[0044] Among them, in the existing lung diffusion test equipment, in order to facilitate the use of the subjects and the consideration of the aesthetic design of the structure, the control host where the gas analysis module 2 is located is usually separated far away from the breathing interface of the subject (i.e. the disposable mouthpiece 45), such as Figure 1As shown, the user breathing interface of the desktop lung function instrument is arranged on the trolley support arm, and the control host is fixed on the trolley. In this way, when performing the lung diffusion test, in order to facilitate the gas analysis module 2 to obtain the exhaled breath of the subject at the breathing interface, the balance pipe 7 is used to connect the sampling joint (arranged on the pipeline between the breathing interface and the flow sensor 43, not shown) at the breathing interface and the gas analysis module 2. At this time, the exhaled gas of the subject needs to pass through the balance pipe 7 to reach the gas analysis module 2, and the length of the balance pipe 7 is usually long, such as the length of the balance pipe 7 of some desktop lung function instruments can reach 1m. Such a structure design will inevitably lead to the exhaled gas flow of the subject flowing in the gas path for too long, so that the concentration measurement response of the gas analysis module 2 is significantly slower than the gas flow output end.

[0045] Therefore, in addition to implementing gain calibration, the standard calibration gas path for the gas analysis module 2 on the existing lung diffusion test equipment usually also needs to implement delay time calibration. The delay time calibration refers to calibrating and determining the flow time of the gas flow from the sampling end (i.e. the sampling joint) of the balance pipe 7 to the gas analysis module 2.

[0046] Therefore, the diffusion test gas path and the standard calibration gas path of the lung diffusion test equipment are basically arranged at the same position on the lung diffusion test equipment, and the diffusion test gas path and the standard calibration gas path can use the same length of balance pipe 7 or the same balance pipe 7 to communicate with the gas analysis module 2. For example, Figure 1 As shown, the sampling joint of the test gas path (arranged on the pipeline between the breathing interface and the flow sensor 43, not shown) and the calibration gas path interface of the standard calibration gas path are located on the trolley support arm. During the lung diffusion test, the inlet end of the balance pipe 7 is connected to the sampling joint, and during the standard calibration, the inlet end of the balance pipe 7 is connected to the calibration gas path interface of the standard calibration gas path. In this way, the distance between the calibration gas path interface of the standard calibration gas path and the gas analysis module 2 is basically the same as the distance between the sampling joint 44 and the gas analysis module 2, so that the delay time calibration for the lung diffusion test gas path can be indirectly realized by using the standard calibration gas path. The delay time calibration needs to be analyzed according to the curve output by the gas analysis module 2, which will not be described in detail here.

[0047] However, the time-consuming of the delay time calibration is long, which makes the overall time-consuming of the gain calibration using the existing standard calibration gas path also too long. Therefore, when the environment changes greatly and the gain calibration needs to be performed on the gas analysis module 2, using the existing standard calibration gas path for calibration will inevitably lead to too long clinical test time and affect the efficiency of the lung diffusion test.

[0048] Based on the above technical problems, the following will be further described with reference to the drawings.

[0049] Specifically refer toFigure 2 , Figure 2 A structural schematic diagram of one embodiment of a lung diffusion test device 200 of the present application is shown. The lung diffusion test device 200 includes:

[0050] a diffusion host 1, a gas analysis module 2, a standard gas cylinder 3, a test gas path 4, a standard calibration gas path 5, a gain calibration gas path 6, and a balance pipe 7;

[0051] The gas analysis module 2 is arranged in the diffusion host 1;

[0052] The first ends of the test gas path 4, the standard calibration gas path 5, and the gain calibration gas path 6 are all communicated to the standard gas cylinder 3, the second ends of the test gas path 4 and the standard calibration gas path 5 are both communicated to the gas analysis module 2 through the balance pipe 7, the main body of the gain calibration gas path 6 is arranged in the diffusion host 1, and the second end of the gain calibration gas path 6 is directly communicated 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;

[0053] The standard calibration gas path 5 is used for gain calibration and delay time calibration, and the gain calibration gas path 6 is only used for gain calibration.

[0054] In this embodiment, the first end and the second end are respectively the end close to the standard gas cylinder 3 and the end away from the standard gas cylinder 3 in the gas flow direction of the standard gas cylinder 3.

[0055] The diffusion host 1 is the control center of the lung diffusion test function, and the diffusion host 1 can be provided with a controller which can be a micro controller unit (MCU), which is electrically connected with the gas analysis module 2, the standard gas cylinder 3, and electronic control devices in the gas path module, such as various valves, motors, and switches, to realize clinical test of the lung diffusion function and calibration of the gas analysis module 2, etc.

[0056] The gas analysis module 2 can mainly include an NDIR assembly, a sampling pump, a gas capacitor, and a drying tube, etc. The sampling pump is located at the end of the gas path, and the measured gas extracted from the gas path first enters the drying tube for drying treatment, and then enters the NDIR module. The NDIR module analyzes the concentration of some gas components in the measured gas entering the gas analysis module 2, such as carbon monoxide and methane, etc., and can be uploaded to the upper computer. The gas capacitor is used to reduce the pressure fluctuation caused by the sampling pump. The basic structure and principle of the NDIR module can refer to the foregoing description, and will not be described in detail here.

[0057] The standard gas cylinder 3 stores a standard concentration of mixed gas, which usually contains 0.3% carbon monoxide, 10% helium or methane as a tracer gas, 21% oxygen, and nitrogen.

[0058] A test gas path 4 is used to realize lung diffusion function, and a first end of the test gas path 4 is communicated with the standard gas bottle 3, and a second end of the test gas path 4 is connected with a disposable mouthpiece and provided with a sampling joint. In the inhalation stage of the subject, the subject inhales the mixed gas with a standard concentration from the standard gas bottle 3 through the test gas path 4, and then the subject holds breath for a set time and exhales, and the gas analysis module 2 starts the sampling pump to inhale the gas exhaled by the subject through the balance pipe 7 and the sampling joint and detect the concentration.

[0059] A standard calibration gas path 5 is equivalent to the standard gas path in the existing lung diffusion test equipment, a first end of the standard calibration gas path 5 is communicated with the standard gas bottle 3, and a second end of the standard calibration gas path 5 is communicated with the gas analysis module 2 through the balance pipe 7 with the same length or the same pipe as the test gas path 4, and the distance between the second end of the standard calibration gas path 5 and the gas analysis module 2 is basically the same as the distance between the sampling joint of the test gas path 4 and the gas analysis module 2, so as to realize gain calibration and delay time calibration. The related concepts of gain calibration and delay time calibration are referred to the foregoing content, and will not be described here.

[0060] The gain calibration gas path 6 is a newly added calibration gas path, and a main body of the gain calibration gas path 6 is arranged in the diffusion host 1. Therefore, a first end of the gain calibration gas path 6 is communicated with the standard gas bottle 3, and a second end of the gain calibration gas path 6 can be directly communicated with the gas analysis module 2 without passing through the balance pipe 7, so that the length of the gain calibration gas path 6 is greatly reduced. Since the distance between the sampling end of the gain calibration gas path 6 and the gas analysis module 2 is short, when the gas analysis module 2 is calibrated by using the gain calibration gas path 6, the delay caused by the flow time of the gas flow in the pipe can be ignored, and only the gain calibration of the gas analysis module 2 is realized. It is verified by practice that the length of the gain calibration can be controlled to 4s by using the gain calibration gas path 6.

[0061] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0062] The lung diffusion test equipment 200 of the embodiment introduces the newly added gain calibration gas path 6, and the main body of the gain calibration gas path 6 can be arranged in the diffusion host 1. Compared with the conventional standard calibration gas path 5, the distance between the sampling end of the gas path and the gas analysis module 2 can be greatly reduced, the delay time calibration is not needed, and the calibration time is reduced. Therefore, when the environmental parameters change greatly, the operator can timely use the gain calibration gas path 6 to calibrate the gain of the gas analysis module 2, so as to ensure the gas accuracy in the test process and improve the lung diffusion test efficiency and accuracy.

[0063] The lung diffusion test equipment 200 of the present application will be described below with reference to a specific embodiment. Specifically refer to Figure 3 , Figure 3 The design schematic diagram of a specific embodiment of the lung diffusion test equipment 200 of the present application.

[0064] In the specific embodiment, as shown in Figure 3 The test gas path 4 can include a demand valve 41, a three-way valve 42, a flow sensor 43, a sampling joint 44, and a disposable mouthpiece 45, which are connected in sequence by connecting tubes. The demand valve 41 is used to provide a certain flow of standard gas according to the negative pressure of inhalation. The balance pipe 7 is used to balance the humidity of the gas in the balance pipe 7 and the ambient gas. The three-way valve 42 is used for switching between ventilation test and diffusion test functions. The flow sensor 43 can be a screen type differential pressure or ultrasonic flow sensor, which is used to detect the flow of respiratory gas of the subject. The sampling joint 44 is a tubular structure in the form of a three-joint, which is connected in series in the gas path and is used to connect with the balance pipe 7. The disposable mouthpiece 45 is used to avoid cross infection and has a filtering effect. The first end of the test gas path 4 is specifically the inlet end of the demand valve 41, and the second end of the test gas path 4 is specifically the outlet end of the sampling joint 44.

[0065] When performing a lung diffusion test, the operator can connect the sampling joint 44 and the gas analysis module 2 by using the balance pipe 7, and set the lung diffusion test gas path 4 to be in communication between the standard gas bottle 3, while the other two gas paths are in a blocked state. Specifically, when the subject inhales, the standard gas bottle 3 and the demand valve 41 are opened, and the three-way valve 42 is in communication with the demand valve 41. At this time, the subject inhales the mixed gas output by the standard gas bottle 3 through the disposable mouthpiece 45. Then, the subject holds his breath for a certain time and exhales. At this time, the standard gas bottle 3 and the demand valve 41 can be closed, and the three-way valve 42 is turned to be in communication with the air. The user exhales, and the gas analysis module 2 starts the sampling pump to inhale the gas exhaled by the subject from the sampling joint 44 through the balance pipe 7 and detects the concentration.

[0066] In the specific embodiment, referring to Figure 3 The gain calibration gas path 6 includes an equivalent gas resistance member 65, which can be a tubular member with a screen structure or other gas resistance structure inside. The gas resistance value of the equivalent gas resistance member 65 is equivalent to that of the balance pipe 7, which 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 flow rate of the gas flow also has a certain influence on the test of the gas analysis module 2, the design can make the gain calibration gas path 6 and the standard calibration gas path 5 have the same structure and factors when performing gain calibration. Therefore, the flow rates of the sampling gas collected at the respective second ends, i.e., the sampling ends, of the equivalent gas resistance member 65 and the balance pipe 7 can be kept consistent as much as possible, avoiding the problem that the possible results of the gain calibration of the two are different due to the different gas resistance of the gain calibration gas path 6 and the standard calibration gas path 5.

[0067] In the embodiment, the standard calibration gas path 5 and the gain calibration gas path 6 include two-position two-way electromagnetic valves of the same type, flow control air resistance, sampling ports and exhaust ports, the exhaust ports of the standard calibration gas path 5 and the gain calibration gas path 6 are connected to air, the sampling port of the standard calibration gas path 5 is used to connect to the first end of the balance pipe 7, and the sampling port of the gain calibration gas path 6 is used to connect to the first end of the equivalent air resistance element 65.

[0068] Specifically, referring to Figure 3 , the standard calibration gas path 5 can be sequentially provided with a first electromagnetic valve 51, a first flow control air resistance 52, a first sampling port 53 and a first exhaust port 54 in the gas flow direction, and the gain calibration gas path 6 is sequentially provided with a second electromagnetic valve 61, a second flow control air resistance 62, a second sampling port 63 and a second exhaust port 64 in the gas flow direction. Among them, the first electromagnetic valve 51 and the second electromagnetic valve 61 can be two-position two-way electromagnetic valves, the first exhaust port 54 and the second exhaust port 64 are connected to 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 equivalent air resistance element 65. By using the flow control air resistance, the output gas flow can be controlled, and the excess gas is discharged through the exhaust port.

[0069] In the embodiment, the gain calibration gas path 6 further includes a two-position three-way electromagnetic valve 66, the balance pipe 7 and the second end of the equivalent air resistance element 65 are connected to one of the two inlet ends of the two-position three-way electromagnetic valve 66, and the outlet end of the two-position three-way electromagnetic valve is connected to the gas analysis module 2.

[0070] Specifically, referring to Figure 3 , the connected inlet end of the balance pipe 7 is in a normally open state, and the connected inlet end of the equivalent air resistance element 65 is in a normally closed state, and the switching of different gas paths can be realized by controlling the on-off state of the two-position three-way electromagnetic valve 66.

[0071] In the embodiment, the lung diffusion test device 200 further includes a pressure stabilizing module 8, the pressure stabilizing module 8 includes a pressure reducer 81 and a pressure sensor 82, and the pressure stabilizing module 8 is arranged at the outlet end of the standard gas cylinder 3. The output gas flow of the standard gas cylinder 3 selectively enters the first end of the test gas path 4, the standard calibration gas path 5 or the gain calibration gas path 6 after flowing through the pressure stabilizing module 8.

[0072] Specifically, referring to Figure 3 , the pressure reducer 81 and the pressure sensor 82 are arranged in sequence according to the gas flow direction, the pressure reducer 81 is used to convert high-pressure gas in the bottle into low-pressure gas 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, so as to ensure the stability of the gas path pressure.

[0073] In the embodiment, the pressure stabilizing module 8 comprises a filter screen 83 and a one-way valve 84.

[0074] Specifically, referring to Figure 3 , the filter screen 83 can filter the input gas to prevent particulate matter from entering the airway, and the one-way valve 84 is used to prevent backflow of the gas.

[0075] In the embodiment, the pressure stabilizing module 8 further comprises a pressure reducing valve 85. After the output gas stream of the standard gas cylinder 3 flows through the pressure reducer 81, the pressure sensor 82, and the pressure reducing valve 85, the gas selectively enters the first end of the standard calibration gas path 5 or the gain calibration gas path 6.

[0076] Specifically, referring to Figure 3 , according to the flow direction of the gas stream, the pressure reducing valve 85 can be further arranged after the pressure sensor 82. The pressure reducing valve 85 is arranged at the input end of the standard calibration gas path 5 and the gain calibration gas path 6, and can further control the output pressure of the calibration gas.

[0077] In the embodiment, the pressure stabilizing module 8 can be arranged integrally in the diffusion host 1 to improve the integration of the system and reduce the size of the device.

[0078] In Figure 2 or Figure 3 the embodiment, referring to Figure 4 , Figure 4 is a design schematic diagram of another embodiment of the lung diffusion test device 200.

[0079] In the embodiment, the lung diffusion test device 200 further comprises a host computer 9. The host computer 9 is connected to the diffusion host 1. The host computer 9 is used to issue a gas path switching instruction to the diffusion host 1. 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 gas path switching instruction.

[0080] In the embodiment, the host computer 9 is used to display a gas gain calibration prompt at a regular time to instruct the user to perform automatic gain calibration on the gas analysis module 2 through the gain calibration gas path 6.

[0081] Specifically, the function is set as a check item on the interface of the host computer 9. The user can check and use according to the local climate difference requirement. Since the lung diffusion test device 200 introduced in the application introduces a new gain calibration gas path 6, the time consumption of gain calibration is reduced, and therefore, the host computer 9 can be used to prompt at a regular time to instruct the user to perform automatic gain calibration on the gas analysis module 2 at a regular time, thereby improving the measurement accuracy of the gas analysis module 2.

[0082] In the embodiment, referring to Figure 4and Figure 5 wherein Figure 5 is a flowchart of a method performed by the lung diffusion test device 200 of the present application. The lung diffusion test device 200 can further comprise an environmental monitoring module 10, and the host computer 9 of the lung diffusion test device 200 is further configured to perform the following steps:

[0083] S501, when performing gas calibration or gain calibration on the gas analysis module 2, recording first environmental temperature and humidity data at the time of calibration by the environmental monitoring module 10;

[0084] S502, obtaining current second environmental temperature and humidity data by the environmental monitoring module 10;

[0085] S503, determining whether the difference between the first environmental temperature and humidity data and the second environmental temperature and humidity data exceeds a preset threshold value;

[0086] S504, if it exceeds, generating a calibration prompt to instruct the user to perform a gain calibration instruction on the gas analysis module 2.

[0087] Specifically, based on the foregoing description, the environmental parameters have a greater impact on the measurement accuracy of the gas analysis module 2, and if the gain calibration of the gas analysis module 2 is performed frequently, it will bring about a decrease in test efficiency, and if the environmental parameters change little, frequent gain calibration may not improve accuracy and may also cause waste of standard gas.

[0088] Therefore, according to the test data, a preset threshold value of the environmental parameter variation can be set, which is considered to significantly affect the measurement accuracy of the gas analysis module 2. Further, when performing gain calibration on the gas analysis module 2 each time, the first environmental temperature and humidity data at the time of calibration can be obtained and recorded by the environmental monitoring module 10. Then, 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, the host computer 9 generates a calibration prompt to instruct the user to promptly issue a gain calibration instruction on the gas analysis module 2, so as to avoid the influence of the change of the environmental parameters on the accuracy of the gas analysis module 2.

[0089] Obviously, the above-described embodiments are only some embodiments but not all the embodiments of the present application, the preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent replacements to some technical features therein. Any equivalent structure made by using the content of the specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A pulmonary diffusing capacity test device characterized by, The device comprises: a diffusion host, a gas analysis module, a standard gas cylinder, a test gas path, a standard calibration gas path, a gain calibration gas path and a balance pipe; the gas analysis module is arranged in the diffusion host; first ends of the test gas path, the standard calibration gas path and the gain calibration gas path are communicated with the standard gas cylinder, second ends of the test gas path and the standard calibration gas path are communicated with the gas analysis module through the balance pipe, a main body of the gain calibration gas path is arranged in the diffusion host and a second end of the gain calibration gas path is directly communicated with 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 path is used for gain calibration and delay time calibration, and the gain calibration gas path is only used for the gain calibration.

2. The lung diffusing capacity test device of claim 1, wherein, The gain calibration gas path comprises an equivalent gas resistor, and a gas resistance value of the equivalent gas resistor is equivalent to a resistance value of the balance pipe.

3. The lung diffusing capacity test device of claim 2, wherein, The standard calibration gas path and the gain calibration gas path comprise two-position two-way electromagnetic valves of the same type, flow control resistors, sampling ports and exhaust ports, the exhaust ports of the standard calibration gas path and the gain calibration gas path are communicated with air, the sampling port of the standard calibration gas path is used for connecting with a first end of the balance pipe, and the sampling port of the gain calibration gas path is used for connecting with a first end of the equivalent gas resistor.

4. The lung diffusing capacity test device of claim 3, wherein, The gain calibration gas path further comprises a two-position three-way electromagnetic valve, second ends of the balance pipe and the equivalent gas resistor are connected with one of two inlet ends of the two-position three-way electromagnetic valve respectively, and an outlet end of the two-position three-way electromagnetic valve is communicated with the gas analysis module.

5. The lung diffusing capacity test device of claim 4, wherein, The lung diffusion test device further comprises a pressure stabilizing module, the pressure stabilizing module comprises a pressure reducer and a pressure sensor, the pressure stabilizing module is arranged at an outlet end of the standard gas cylinder, and output gas flow of the standard gas cylinder selectively enters the first end of the test gas path, the standard calibration gas path or the gain calibration gas path after flowing through the pressure stabilizing module.

6. The lung diffusing capacity test device of claim 5, wherein, The pressure stabilizing module further comprises a filter screen and a one-way valve.

7. The lung diffusing capacity test device of claim 6, wherein, The pressure stabilizing module further comprises a pressure reducing valve, and output gas flow of the standard gas cylinder selectively enters the first end of the standard calibration gas path or the gain calibration gas path after flowing through the pressure reducer, the pressure sensor and the pressure reducing valve.

8. The lung diffusing capacity test device of claim 4, wherein, The lung diffusion test device further comprises a host computer, the host computer is connected with the diffusion host, the host computer is used for issuing a gas path switching instruction to the diffusion host, and the diffusion host is used for switching the test gas path, the standard calibration gas path and the gain calibration gas path according to the gas path switching instruction.

9. The lung diffusing capacity test device of claim 8, wherein, The host computer is used for displaying a gas gain calibration prompt at a time to instruct a user to perform automatic gain calibration on the gas analysis module through the gain calibration gas path.

10. The lung diffusing capacity test device of claim 8, wherein, The lung diffusion test device further comprises an environment monitoring module, and the host computer is further used for performing the following steps: when performing gas calibration or gain calibration on the gas analysis module, recording first environment temperature and humidity data at the time of calibration through the environment monitoring module; obtaining second current environment temperature and humidity data through the environment monitoring module; determining whether a difference between the first ambient temperature and humidity data and the second ambient temperature and humidity data exceeds a preset threshold value; if so, generating a calibration prompt to instruct a user to execute a gain calibration instruction on the gas analysis module.

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