A detection system for lung diffusion function

Abstract

The present invention relates to a detection system for lung diffusion function, comprising an air supply element, a controller, a main air circuit connected to the outlet end of the air supply element, and a gas analyzer for calibrating test gas and detecting exhaled gas. The outlet end of the air supply element is connected to a first valve connected to the main air circuit, and the side of the main air circuit away from the air supply element is connected to a first flow meter and a mouthpiece in sequence. The present invention adopts the main air circuit, the first auxiliary air circuit, the second auxiliary air circuit, the third auxiliary air circuit and a sampling tube to connect the air supply element, the gas analyzer, the air pump, and the flow meter, and controls each valve to be automatically opened and closed by the controller. Compared with the existing lung function detection equipment, the present invention is based on the one-breath breathing method to provide a detection system for lung carbon monoxide diffusion function, which can more accurately detect the basic indicators of lung function of the subject, especially improve the detection accuracy of lung diffusion function.

Description

Technical Field

[0001] The present invention relates to the technical field of medical detection equipment, in particular to a detection system for lung diffusion function. Background Art

[0002] Pulmonary diffusion function refers to the ability of a certain alveolar gas to diffuse from the alveoli to the capillaries to the blood through the alveolar-capillary membrane (composed of the alveolar epithelium and its basement membrane, the alveolar capillary endothelium and its basement membrane, and the connective tissue between the two basement membranes) and to 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 direct calculation of the diffusion capacity of oxygen requires the measurement of the average partial pressure of oxygen in the pulmonary capillary blood, the method is complicated; and the binding force of carbon monoxide (CO) with hemoglobin is 210 times greater than that of oxygen (O2), and the partial pressure of oxygen within the physiological range is not a major interference factor; except for heavy smokers, the carbon monoxide (CO) content in the plasma of normal people is almost zero, which is convenient for calculating the intake of carbon monoxide (CO) during the examination; and carbon monoxide (CO) rarely dissolves in the plasma during the transport process, so carbon monoxide (CO) has become an ideal gas for measuring pulmonary diffusion function.

[0003] In 1915, Krogh first proposed to use carbon monoxide (CO) to measure the pulmonary diffusion capacity (D L There are many different methods for testing the carbon monoxide (CO) diffusion capacity of the lungs, including the one-breath breathing method, the carbon monoxide uptake method, the steady-state method, the repeated breathing method, and the recently developed internal breathing method, which is simple to operate and does not require breath holding. However, the one-breath breathing method for carbon monoxide (CO) diffusion capacity of the lungs (D L CO single-breath method, D L CO-sb) is the most commonly used.

[0004] In the prior art, pulmonary function testing equipment is mainly composed of a spirometer, a gas analyzer and a pressure gauge, which can measure most indicators of pulmonary function, such as lung capacity, ventilation, diffusion, respiratory muscle strength, oxygen consumption, carbon dioxide production, etc. It has a simple structure and can only detect common indicators of pulmonary function, but cannot accurately measure D L CO detection, and the automatic sampling volume adjustment cannot be achieved. For children with VC less than 1L or patients with severe restrictive diseases, D L CO is difficult to detect accurately;

[0005] In addition, existing equipment requires regular, suspected D LIf there is a problem with the CO inspection and before each inspection after starting the machine every day, the gas analyzer must be zero-calibrated and manually calibrated using a calibration cylinder to determine and ensure that the volume or flow test of the spirometer is normal. Manual operation is complicated and inconvenient to use, and calibration errors are prone to occur, resulting in inaccurate test data and low test efficiency, which is disadvantageous to both the operator and the patient. Therefore, in order to solve the above problems, a detection system for lung diffusion function is proposed. Summary of the invention

[0006] The present invention aims to provide a detection system for lung diffusion function, so as to solve the problem that the lung function detection equipment in the prior art cannot accurately detect the D L The detection of CO cannot be realized, and the automatic sampling volume adjustment cannot be realized. The use is limited and the manual operation is complicated and inconvenient.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a detection system for lung diffusion function, comprising an air supply element, a controller, a main air circuit connected to the outlet end of the air supply element, and a gas analyzer for calibrating test gas and detecting exhaled gas, wherein the outlet end of the air supply element is connected to a first valve connected to the main air circuit, and the side of the main air circuit away from the air supply element is connected to a first flow meter and a mouthpiece in sequence, and the main air circuit branches into a first auxiliary air circuit, a second auxiliary air circuit and a third auxiliary air circuit located between the first valve and the first flow meter, the first auxiliary air circuit is connected to the second valve at one end close to the main air circuit, and the ends of the second auxiliary air circuit and the third auxiliary air circuit are respectively connected to a sixth valve and a pressure sensor, the main air circuit between the first auxiliary air circuit and the second auxiliary air circuit is connected to a fourth valve and a fifth valve, the inlet end of the gas analyzer is connected to a sampling tube, and the sampling tube is used to collect the test gas derived from the first auxiliary air circuit and the exhaled gas of the mouthpiece, the outlet end of the gas analyzer is connected to an air pump, and the controller is electrically connected to the second valve, the fourth valve, the sixth valve, the first flow meter, the gas analyzer and the air pump.

[0008] Preferably, one end of the sampling tube facing away from the gas analyzer is plugged into the outlet end of the first auxiliary gas circuit.

[0009] Preferably, the end of the sampling tube facing away from the gas analyzer is connected to the main gas path of the inlet or outlet of the first flow meter.

[0010] Preferably, it further comprises a seventh valve connected to the inlet end of the gas analyzer, wherein the seventh valve is a three-position three-way solenoid valve, and the seventh valve is electrically connected to the controller.

[0011] Preferably, the two ports of the seventh valve facing away from the gas analyzer are both connected to sampling tubes, one of which is connected to the first auxiliary gas circuit through the sampling tube, and the other is connected to the main gas circuit at the inlet or outlet of the first flowmeter through the sampling tube.

[0012] Preferably, it further includes a third valve connected to the main gas circuit, wherein the third valve is a pressure relief valve, and the third valve is connected to the branch end of the main gas circuit between the first valve and the fourth valve.

[0013] Preferably, the outlet end of the air pump is connected to a second flow meter, and the second flow meter is electrically connected to the controller.

[0014] Preferably, the first valve is a pressure reducing valve, the second valve is a three-position three-way solenoid valve, the fourth valve is an air supply valve, the fifth valve is a one-way valve or an on-demand valve, and the sixth valve is a blocking valve.

[0015] Preferably, it also includes a noise reduction and smoothing device, which is connected to the main air circuit between the fifth valve and the second auxiliary air circuit.

[0016] Preferably, the noise reduction and smoothing device is a pipeline with a built-in honeycomb mesh, and the honeycomb mesh is composed of a plurality of stacked stainless steel mesh sheets.

[0017] The present invention has at least the following beneficial effects:

[0018] 1. The present invention adopts the main gas circuit, the first auxiliary gas circuit, the second auxiliary gas circuit, the third auxiliary gas circuit and the sampling tube to connect the gas supply element, the gas analyzer, the air pump and the flow meter, and controls each valve to open and close automatically through the controller. Compared with the existing pulmonary function detection equipment, the present invention provides a detection system for the carbon monoxide diffusion function of the lungs based on the one-breath breathing method, which can more accurately detect the basic indicators of the lung function of the subject, especially improve the detection accuracy of the pulmonary diffusion function;

[0019] 2. The present invention uses a second valve to switch the sampling path of the gas analyzer, and realizes automatic sampling volume adjustment through the cooperation of the air pump and the second flow meter. It is suitable for children with VC less than 1L or patients with severe restrictive diseases. L CO detection has a wider range of applications, and the controller controls the opening and closing of each valve, as well as the coordination of various components to automatically perform zero point calibration and test gas calibration. Frequent manual operation is unnecessary, effectively avoiding the phenomenon of inaccurate calibration caused by manual use of calibration cylinders. The calibration operation before startup and testing is simpler and more convenient, which improves the test efficiency and accuracy of the subjects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the gas calibration state of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the diffusion test state of the present invention;

[0022] Figure 3It is a structural schematic diagram of another embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of controller connection in the present invention.

[0024] In the accompanying drawings: 1. air supply element; 2. main air circuit; 3. first auxiliary air circuit; 4. second auxiliary air circuit; 5. third auxiliary air circuit; 6. first valve; 7. second valve; 8. third valve; 9. fourth valve; 10. fifth valve; 11. sixth valve; 12. first flow meter; 13. mouthpiece; 14. pressure sensor; 15. gas analyzer; 16. sampling tube; 17. seventh valve; 18. air pump; 19. second flow meter; 20. noise reduction and smoothing device; 21. controller. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] See also Figure 1 , 2 4. The present invention provides a technical solution: a detection system for lung diffusion function, comprising an air supply element 1, a controller 21, a main air circuit 2 connected to the outlet end of the air supply element 1, and a gas analyzer 15 for calibrating test gas and detecting exhaled gas. Specifically, the air supply element 1 can be a gas source bottle or a compressed air source device, which is used to provide test gas for lung diffusion function detection. The outlet end of the air supply element 1 is connected to a first valve 6 connected to the main air circuit 2. Specifically, the first valve 6 is a pressure reducing valve, which is used to reduce the pressure at the outlet of the air supply element 1 so that the pressure of the main air circuit 2 after the first valve 6 is stable. It is opened when working and closed when not working. The side of the main air circuit 2 away from the air supply element 1 is connected to a first flow meter 12 and a mouthpiece 13 in sequence. Specifically, the first flow meter 12 is a flow sensor, which is used to measure the flow rate and volume value of the subject during the test phase. The mouthpiece 13 is the place where the subject's oral cavity contacts the device. The subject must hold the mouthpiece 13 in his mouth to perform the lung diffusion function test.

[0028] The main gas circuit 2 branches into a first auxiliary gas circuit 3, a second auxiliary gas circuit 4 and a third auxiliary gas circuit 5 located between the first valve 6 and the first flow meter 12. Specifically, the first auxiliary gas circuit 3, the second auxiliary gas circuit 4 and the third auxiliary gas circuit 5 are distributed on the main gas circuit 2 between the first valve 6 and the first flow meter 12, and are distributed in the direction away from the gas supply element 1. The end of the first auxiliary gas circuit 3 close to the main gas circuit 2 is connected to the second valve 7. Specifically, the second valve 7 is a three-position three-way solenoid valve. One of the inlet ends of the second valve 7 is connected to the first auxiliary gas circuit 3, and the other inlet end of the second valve 7 is connected to the outside air. During air calibration, the port connected to the outside air is opened. During test gas calibration, the port connected to the first auxiliary gas circuit 3 is opened. The remaining stages are normally closed. The ends of the second auxiliary gas circuit 4 and the third auxiliary gas circuit 5 are respectively connected with a sixth valve 11 and a pressure sensor 14. Specifically, the sixth valve 11 is a blocking valve, which is used to cut off the gas circuit from the atmosphere. It is closed during the inhalation and breath-holding stages of the diffusion test, and opened in other stages. The pressure sensor 14 is used to measure the size of the oral pressure during the test stage. Usually, attention is paid to the oral pressure value during the breath-holding stage, and the oral pressure change is required not to exceed ±3kPa during the breath-holding stage of the diffusion test. The main gas circuit 2 between the first auxiliary gas circuit 3 and the second auxiliary gas circuit 4 is connected to the fourth valve 9 and the fifth valve 10. Specifically, the fourth valve 9 is an air supply valve, which is opened when the gas source needs to be inhaled during the diffusion test stage, and is normally closed in other stages. The fifth valve 10 is a one-way valve, which is opened when there is a negative pressure in the main gas circuit 2 to allow the gas source to pass through;

[0029] The inlet end of the gas analyzer 15 is connected to a sampling tube 16, and the sampling tube 16 is used to collect the test gas derived from the first auxiliary gas path 3 and the exhaled gas of the mouthpiece 13;

[0030] During the gas calibration stage, the end of the sampling tube 16 away from the gas analyzer 15 is plugged into the outlet end of the first auxiliary gas circuit 3, so that the outlet end of the second valve 7 can be connected through the sampling tube 16. During the air zero point calibration, the second valve 7 is adjusted to the position where the outside air is connected to the sampling tube 16, and the gas analyzer 15 performs zero point calibration through air. During the test gas calibration, the second valve 7 is adjusted to the position where the first auxiliary gas circuit 3 is connected to the sampling tube 16, and the gas analyzer 15 performs test gas calibration on the gas supply element 1;

[0031] In the diffusion function test stage, the end of the sampling tube 16 away from the gas analyzer 15 is connected to the main gas path 2 at the inlet end or the outlet end of the first flow meter 12. Specifically, a branch port is provided at the main gas path 2 at the inlet end or the outlet end of the first flow meter 12, and is plugged with the end of the sampling tube 16 away from the gas analyzer 15, so that the gas exhaled by the subject through the mouthpiece 13 is introduced into the gas analyzer 15 by the sampling tube 16, and then the gas analyzer 15 tests the exhaled gas of the subject;

[0032] The outlet end of the gas analyzer 15 is connected to an air pump 18. Specifically, the air pump 18 is a speed-adjustable pump for extracting gas during the test through the air path to achieve automatic sampling volume adjustment. The controller 21 is electrically connected to the second valve 7, the fourth valve 9, the sixth valve 11, the first flow meter 12, the gas analyzer 15 and the air pump 18. Specifically, the controller 21 is used for centralized control of electrical components.

[0033] Example 2

[0034] See also Figure 3 and 4 The present invention provides a technical solution: a detection system for lung diffusion function, comprising an air supply element 1, a controller 21, a main air path 2 connected to the outlet end of the air supply element 1, and a gas analyzer 15 for calibrating test gas and detecting exhaled gas. Specifically, the air supply element 1 can be a gas source bottle or a compressed gas source device, which is used to provide test gas for lung diffusion function detection. The outlet end of the air supply element 1 is connected to a first valve 6 connected to the main air path 2. Specifically, the first valve 6 is a pressure reducing valve, which is used to reduce the pressure at the outlet of the air supply element 1 so that the pressure of the main air path 2 after the first valve 6 is stable, and is opened when working and closed when not working.

[0035] The side of the main air circuit 2 facing away from the air supply element 1 is connected with a first flow meter 12 and a mouthpiece 13 in sequence. Specifically, the first flow meter 12 is a flow sensor for measuring the flow and volume value of the subject during the test phase. The mouthpiece 13 is the place where the subject's oral cavity contacts the device. The subject must hold the mouthpiece 13 in his mouth to perform a pulmonary diffusion function test. The main air circuit 2 branches into a first auxiliary air circuit 3, a second auxiliary air circuit 4 and a third auxiliary air circuit 5 located between the first valve 6 and the first flow meter 12. Specifically, the first auxiliary air circuit 3, the second auxiliary air circuit 4 and the third auxiliary air circuit 5 are distributed on the main air circuit 2 between the first valve 6 and the first flow meter 12, and are distributed in a direction away from the air supply element 1. The first auxiliary air circuit 3 is connected with a second valve 7. Specifically, the second valve 7 is a three-position three-way solenoid valve. One of the inlet ends of the second valve 7 is connected to the first auxiliary air circuit 3, and the other inlet end of the second valve 7 is connected to the outside air. During air calibration When the test gas is calibrated, the port connected to the outside air is opened. When the test gas is calibrated, the port connected to the first auxiliary gas circuit 3 is opened, and the other stages are normally closed. The ends of the second auxiliary gas circuit 4 and the third auxiliary gas circuit 5 are respectively connected with the sixth valve 11 and the pressure sensor 14. Specifically, the sixth valve 11 is a blocking valve, which is used to cut off the gas circuit from the atmosphere. It is closed during the inhalation and breath-holding stages of the diffusion test, and opened in other stages. The pressure sensor 14 is used to measure the size of the oral pressure during the test stage. Usually, the focus is on the oral pressure value during the breath-holding stage, and the oral pressure change is required not to exceed ±3kPa during the breath-holding stage of the diffusion test. The main gas circuit 2 between the first auxiliary gas circuit 3 and the second auxiliary gas circuit 4 is connected to the fourth valve 9 and the fifth valve 10. Specifically, the fourth valve 9 is an air supply valve, which is opened when the gas source gas needs to be inhaled during the diffusion test stage, and is normally closed in other stages. The fifth valve 10 is a one-way valve, which is automatically turned on when there is a negative pressure in the main gas circuit 2 to allow the test gas to pass through;

[0036] The inlet end of the gas analyzer 15 is connected to the seventh valve 17, which is a three-position three-way solenoid valve. The seventh valve 17 is electrically connected to the controller 21. The two ports of the seventh valve 17 away from the gas analyzer 15 are connected to the sampling tube 16, one of which is connected to the outlet end of the second valve 7 through the sampling tube 16, and the other port is connected to the main gas path 2 at the inlet end or outlet end of the first flow meter 12 through the sampling tube 16. Specifically, the main gas path 2 at the inlet end or outlet end of the first flow meter 12 is provided with a branch port connected to the sampling tube 16, so that the seventh valve 17 can be controlled by the controller 21 to select and open and close and switch the gas path;

[0037] That is, during the gas calibration stage, the seventh valve 17 is adjusted to the position where the second valve 7 is connected to the gas analyzer 15. During the air zero calibration, the second valve 7 is adjusted to the position where the outside air is connected to the sampling tube 16, and the gas analyzer 15 performs zero calibration through air. During the test gas calibration, the second valve 7 is adjusted to the position where the first auxiliary gas path 3 is connected to the sampling tube 16, and the gas analyzer 15 performs test gas calibration on the gas supply element 1.

[0038] In the diffusion function test phase, the seventh valve 17 is adjusted to a position where the mouthpiece 13 is connected to the gas analyzer 15, so that the gas exhaled by the subject through the mouthpiece 13 is introduced into the gas analyzer 15 through the sampling tube 16, and then the gas analyzer 15 tests the exhaled gas of the subject;

[0039] The outlet end of the gas analyzer 15 is connected to an air pump 18. Specifically, the air pump 18 is a speed-adjustable pump for extracting gas during the test through the air path to achieve automatic sampling volume adjustment. The controller 21 is electrically connected to the second valve 7, the fourth valve 9, the sixth valve 11, the first flow meter 12, the gas analyzer 15 and the air pump 18. Specifically, the controller 21 is used for centralized control of electrical components.

[0040] Example 3

[0041] See also Figure 1-4 , based on Example 1 or 2, except that:

[0042] Among them, it also includes a third valve 8 connected to the main gas circuit 2. The third valve 8 is a pressure relief valve. The third valve 8 is connected to the branch end of the main gas circuit 2 between the first valve 6 and the fourth valve 9. Specifically, the main gas circuit 2 between the first valve 6 and the fourth valve 9 is provided with a branch port for the installation of the third valve 8. When the pressure of the main gas circuit 2 is too high due to some reason (such as failure of the first valve 6 or excessive pressure shock of the gas supply element 1 after passing through the first valve 6, etc.), the third valve 8 releases part of the pressure to protect the main gas circuit 2.

[0043] Among them, the outlet end of the air pump 18 is connected to the second flow meter 19, and the second flow meter 19 is electrically connected to the controller 21. Specifically, the second flow meter 19 is a small-range flow sensor, which is used for feedback control of the rotation speed of the air pump 18 or to detect whether the outlet flow size of the air pump 18 is the value required by the gas analyzer 15, and cooperates with the air pump 18 to realize automatic sampling volume adjustment to ensure the stable flow rate of the gas analyzer in the gas analyzer 15.

[0044] Among them, it also includes a noise reduction and smoothing device 20, which is connected to the main air path 2 between the fifth valve 10 and the second auxiliary air path 4. The noise reduction and smoothing device 20 is a pipeline with a built-in honeycomb network. Specifically, the honeycomb network is composed of a number of stacked stainless steel meshes. The noise reduction and smoothing device 20 can reduce the noise of the airflow at the outlet end of the fifth valve 10 and smooth the airflow, that is, the densely distributed honeycomb network can be used to disperse and smooth the passing airflow to avoid airflow shock and affect the subject's inhalation during the test process.

[0045] Working principle:

[0046] When in use, the controller 21 is connected to a host computer (such as a computer) and the host computer analyzes the data and calculates the results. The specific operations are as follows:

[0047] 1. Gas calibration phase workflow:

[0048] When the gas calibration is performed, the sampling tube 16 is connected to the outlet end of the second valve 7 .

[0049] Start calibration:

[0050] Step 1: Let the test gas in the gas supply element 1 flow into the main gas circuit 2, the pressure at the outlet of the first valve 6 is kept stable, the second valve 7 is in a normally closed state, and when the air pressure in the main gas circuit 2 works normally, the third valve 8 is normally closed, and the fourth valve 9 is closed. The second flow meter 19, the air pump 18, and the gas analyzer 15 all start working. The fifth valve 10, the sixth valve 11, the first flow meter 12, and the pressure sensor 14 do not work.

[0051] Step 2: The controller 21 controls the second valve 7 to adjust to the position where the outside air is connected to the sampling tube 16. The gas analyzer 15 first performs zero point calibration after passing the air for a period of time; after the zero point calibration is successful, the controller 21 controls the second valve 7 to repeatedly open and close the passage between the first auxiliary gas path 3 and the sampling tube 16, such as opening for 5s, closing for 5s, or opening for 3s, closing for 3s, etc. After several cycles, the second valve 7 is closed; when the valve 2 is opened, the test gas in the gas supply element 1 is calibrated by the gas analyzer 15 for test gas.

[0052] Step 3: After the calibration is completed, the second flow meter 19, the air pump 18, and the gas analyzer 15 all stop working, the controller 21 uploads the data, and the calibration result is analyzed by the host computer.

[0053] 2. Test procedure of lung diffusion function of subjects:

[0054] After the gas calibration is successful, when the lung diffusion function test is performed, the sampling tube 16 is connected to the branch port of the main gas path 2 at the outlet or inlet of the first flow meter 12.

[0055] Start testing:

[0056] Step 1: Let the test gas in the gas supply element 1 pass into the main gas circuit 2, the pressure at the outlet of the first valve 6 is kept stable, the second valve 7 is normally closed, the third valve 8 is normally closed when the air pressure in the main gas circuit 2 works normally, the fourth valve 9 is closed, the fifth valve 10 is not under negative pressure, so it is temporarily closed, and the sixth valve 11 is open. The pressure sensor 14, the first flow meter 12, the second flow meter 19, the air pump 18, and the gas analyzer 15 all start working.

[0057] Step 2: Usually, the gas analysis module needs to be calibrated at the zero point at the beginning of the test. Therefore, after the gas analysis module is successfully calibrated after a period of time, the subject wears a nose clip and holds the mouthpiece 13 in his mouth to ensure that the gas only enters and exits from the mouthpiece, not from the nasal cavity, and starts calm breathing (tidal breathing). After the subject's tidal breathing is stable, the operator guides the subject to inhale to the total lung capacity (TLC) position, and then start to exhale to the residual volume (RV) position. During the exhalation process, the operator operates the controller 21 to open the fourth valve 9, and the controller 21 starts to detect the subject's breathing condition (whether the subject is exhaling or inhaling at this time, the gas analyzer 15 detects whether the value changes and analyzes it. The change in value means exhalation, and the unchanged value means inhalation).

[0058] Step 3: When the controller 21 detects the moment when the subject changes from exhalation to inhalation, the controller controls the sixth valve 11 to close, and the fifth valve 10 to open under the action of the negative pressure in the main gas path 2, and the subject inhales the test gas in the gas supply element 1.

[0059] Step 4: The subject inhales gas to the total lung capacity (TLC) position. When the controller 21 detects that the subject has finished inhaling, the fourth valve 9 is closed, the air pump 18 stops working, and the controller 21 performs a 10-second breath-holding countdown phase (the breath-holding time can be set before starting the test, and is usually required to be 10 seconds).

[0060] Step 5: After the countdown of the controller 21 ends, the air pump 18 starts to work, opens the sixth valve 11, and informs the subject to exhale to the residual air position and then inhale, and the test ends.

[0061] Step 6: The test can be judged to be over by the controller 21, or it can be ended by manually operating the controller 21. When it is over, the pressure sensor 14, the first flow meter 12, the second flow meter 19, the air pump 18, and the gas analyzer 15 are turned off and stopped. The controller 21 performs data analysis to obtain the diffusion test results.

[0062] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for detecting lung diffusion function, characterized in that: The invention comprises an air supply element (1), a controller (21), a main air path (2) connected to the outlet end of the air supply element (1), and a gas analyzer (15) for calibrating test gas and detecting exhaled gas, wherein the outlet end of the air supply element (1) is connected to a first valve (6) connected to the main air path (2), a side of the main air path (2) facing away from the air supply element (1) is connected to a first flow meter (12) and a mouthpiece (13) in sequence, the main air path (2) branches into a first auxiliary air path (3), a second auxiliary air path (4) and a third auxiliary air path (5) located between the first valve (6) and the first flow meter (12), the first auxiliary air path (3) is connected to a second valve (7) at one end close to the main air path (2), and the second auxiliary air path (4) is connected to a third auxiliary air path (5) at the other end. The ends of the first auxiliary gas circuit (4) and the third auxiliary gas circuit (5) are respectively connected to a sixth valve (11) and a pressure sensor (14); the main gas circuit (2) between the first auxiliary gas circuit (3) and the second auxiliary gas circuit (4) is connected to a fourth valve (9) and a fifth valve (10); the inlet end of the gas analyzer (15) is connected to a sampling tube (16), and the sampling tube (16) is used to collect the test gas derived from the first auxiliary gas circuit (3) and the exhaled gas from the mouthpiece (13); the outlet end of the gas analyzer (15) is connected to an air pump (18); the controller (21) is electrically connected to the second valve (7), the fourth valve (9), the sixth valve (11), the first flow meter (12), the gas analyzer (15) and the air pump (18); The first valve (6) is a pressure reducing valve, the second valve (7) is a three-position three-way solenoid valve, the fourth valve (9) is an air supply valve, the fifth valve (10) is a one-way valve or a demand valve, and the sixth valve (11) is a blocking valve; One inlet end of the second valve (7) is connected to the first auxiliary gas circuit (3), and the other inlet end of the second valve (7) is connected to the outside air. During air calibration, the port connected to the outside air is opened, and during test gas calibration, the port connected to the first auxiliary gas circuit (3) is opened; When performing gas calibration work, the sampling tube (16) is connected to the outlet end of the second valve (7).

2. A system for detecting lung diffusion function according to claim 1, characterized in that: One end of the sampling tube (16) facing away from the gas analyzer (15) is plugged into the outlet end of the first auxiliary gas path (3).

3. A system for detecting lung diffusion function according to claim 1, characterized in that: One end of the sampling tube (16) facing away from the gas analyzer (15) is connected to the main gas path (2) at the inlet end or the outlet end of the first flow meter (12).

4. A system for detecting lung diffusion function according to claim 1, characterized in that: It also includes a seventh valve (17) connected to the inlet end of the gas analyzer (15), wherein the seventh valve (17) is a three-position three-way solenoid valve, and the seventh valve (17) is electrically connected to the controller (21).

5. A system for detecting lung diffusion function according to claim 4, characterized in that: The two ports of the seventh valve (17) facing away from the gas analyzer (15) are both connected to the sampling tube (16), one of the ports is connected to the first auxiliary gas circuit (3) through the sampling tube (16), and the other port is connected to the main gas circuit (2) at the inlet or outlet of the first flow meter (12) through the sampling tube (16).

6. A system for detecting lung diffusion function according to claim 1, characterized in that: It also includes a third valve (8) connected to the main gas path (2), wherein the third valve (8) is a pressure relief valve, and the third valve (8) is connected to a branch end of the main gas path (2) between the first valve (6) and the fourth valve (9).

7. A system for detecting lung diffusion function according to claim 1, characterized in that: The outlet end of the air pump (18) is connected to a second flow meter (19), and the second flow meter (19) is electrically connected to a controller (21).

8. A system for detecting lung diffusion function according to claim 1, characterized in that: It also includes a noise reduction and smoothing device (20), wherein the noise reduction and smoothing device (20) is connected to the main gas path (2) between the fifth valve (10) and the second auxiliary gas path (4).

9. A system for detecting lung diffusion function according to claim 8, characterized in that: The noise reduction and smoothing device (20) is a pipeline with a built-in honeycomb network, and the honeycomb network is composed of a plurality of stacked stainless steel mesh sheets.

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