Expiratory gas collection concentration detection device
By collecting and mixing exhaled air in stages, combined with compressed air dilution and vacuum detection, the problem of oral gas interference in traditional exhaled air detection is solved, and high-precision exhaled air concentration detection is achieved.
Patent Information
- Application Number
- CN202511827125.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-05
- Publication Date
- 2026-02-10
AI Technical Summary
Traditional exhaled breath testing devices are affected by residual gases in the mouth, throat, and trachea, resulting in poor test results, a high false positive rate, and repeated sampling leading to user fatigue and testing errors.
An exhaled gas collection and concentration detection device was designed, including an exhaled gas collection mechanism, a gas equalization tank, and a detection chamber. The device collects and mixes exhaled gas in stages, dilutes oral gas with compressed air, and performs detection in a vacuum environment. It is then combined with hydrogen, methane, and ammonia detectors for accurate analysis.
It improves the precision and accuracy of exhaled breath detection, reduces the false positive rate, reduces user fatigue, and ensures the reliability of test results.
Smart Images
Figure CN121489447A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of exhaled breath detection technology, specifically an exhaled breath collection and concentration detection device. Background Technology
[0002] Breath analysis is a technology that obtains physiological, metabolic, and pathological information by analyzing the composition and concentration of exhaled air. Traditional devices collect a mixture of exhaled air from a single breath, which contains a large amount of residual gas from the mouth, throat, and trachea. These gases are greatly affected by recent diet, oral hygiene, and saliva composition, severely interfering with the alveolar gas signals that truly reflect the body's condition, resulting in poor accuracy and a high false positive rate. In most cases, users need to repeatedly collect breath samples to ensure detection accuracy, but this can lead to fatigue, irritability, and even dizziness (due to hyperventilation). Furthermore, during the interval between two samplings, bacteria in the mouth continue to metabolize, and new volatile organic compounds accumulate again, still causing some detection error.
[0003] Therefore, it is necessary to provide an exhaled breath concentration detection device to solve the problems mentioned in the background art. Summary of the Invention
[0004] To achieve the above objectives, the present invention provides the following technical solution: an exhaled breath concentration detection device, comprising: The main unit housing has an internal assembly slot in which an organic plate is detachably fixed. An exhaled air collection mechanism is installed inside the machine board. One end of the exhaled air collection mechanism is provided with an air inlet, and a breathing tube is connected to the outside of the air inlet. A breathing mask is installed at the other end of the breathing tube. A gas equalizer is fixed on the machine plate below the exhaled air collection mechanism. The gas equalizer is connected to the exhaled air collection mechanism through a hose. A detection chamber is installed in the assembly tank and is connected to the exhaust port of the gas equalization tank; a hydrogen detector, a methane detector and an ammonia detector are connected outside the detection chamber.
[0005] Furthermore, as a preferred embodiment, a vacuum tube is connected outside the detection chamber, and the vacuum tube is connected to an external vacuum pump; The hydrogen detector, methane detector, and ammonia detector are all connected to the control unit, and a thermometer is installed on the detection chamber.
[0006] Furthermore, as a preferred embodiment, the exhaled breath collection mechanism includes: An exhalation chamber has an internal annular wall that divides the exhalation chamber into a central cavity and an outer annular cavity. A breathing tube is fixed in the central cavity. An external trachea is fixed outside the breathing chamber. A switching chamber is provided between the external trachea and the breathing chamber. Multiple microchannels are distributed on one side of the switching chamber, and the other end of the microchannels is connected to the outer ring cavity in the breathing chamber. The first airway and the second airway are located inside the external trachea. One end of the breathing tube is fixed in the conversion chamber. The second airway is sealed and connected to the breathing tube. The first airway is sealed and connected to the conversion chamber through multiple airflow branches.
[0007] Furthermore, as a preferred embodiment, one end of the first airway and the second airway are distributed to the left and right, and the other ends of the first airway and the second airway are distributed at the same center, with the second airway located within the first airway; The external air tube is rotatably fitted with an adapter sleeve, and the adapter sleeve has an oblique hole inside. The oblique hole is adjusted to seal and connect with the first airway or the second airway as the adapter sleeve rotates. The adapter sleeve is coaxially fixed with a driven tooth, and a control motor is installed inside the machine plate. The output end of the control motor meshes with the driven tooth through gear meshing.
[0008] Furthermore, as a preferred embodiment, an air passage pipe is provided outside the main housing, one end of which is connected to an air compressor, and the other end is sealed to the conversion air chamber through a one-way air outlet valve; each of the airflow branches is provided with a one-way valve core; A nitrogen pipe is connected to the outer annular cavity, and a storage tank is horizontally fixed in the main housing. One end of the storage tank is connected to the nitrogen pipe, and an exhaust port is also connected to the outer annular cavity.
[0009] Furthermore, as a preferred embodiment, a valve seat is fixed at one end of the breathing tube away from the external trachea, a bushing is fixed inside the valve seat, a guide rod is slidably connected in the bushing, a slit sleeve is slidably connected inside the breathing tube, a side hole is opened on the side wall of the slit sleeve, and the other end of the guide rod is fixed to the slit sleeve, and an air guide groove is opened on the inner wall of the breathing tube. A support spring is connected inside the bushing, and one end of the support spring is connected to the guide rod.
[0010] Furthermore, as a preferred embodiment, the breathing tube has multiple through holes on its side wall, and a magnetic flux tube is vertically fixed on the annular wall of the exhalation chamber. One end of the magnetic flux tube is slidably connected to a sealing shaft, and the sealing shaft is slidably sealed with the through holes. A piston is also slidably disposed inside the magnetohydrodynamic tube, and the space between the piston and the sealing shaft is filled with magnetohydrodynamic fluid; a limiting spring is sleeved on the piston.
[0011] Furthermore, as a preferred embodiment, an electromagnetic coil is coaxially sleeved in the magnetohydrodynamic tube, and a shaft plug is fixed at one end of the sealing shaft that extends into the magnetohydrodynamic tube.
[0012] Furthermore, as a preferred embodiment, the gas equalization tank has a central channel in the middle, one end of which is connected to the outer annular cavity; the gas equalization tank has an annular groove inside, and the central cavity is connected to the annular groove through multiple branch pipes. The gas equalization tank has multiple inclined channels evenly distributed inside.
[0013] Furthermore, as a preferred embodiment, both the inner walls of the central cavity and the outer annular cavity are provided with an anti-adsorption coating.
[0014] Compared with the prior art, the beneficial effects of the present invention are: The exhaled air collection mechanism in this invention can collect human exhaled air. The external air tube contains a first airway and a second airway. The first airway connects to the outer ring cavity of the exhalation chamber to collect stable, deep breaths. To avoid detection errors caused by oral air, a compressed air tube outside the conversion chamber delivers compressed air, which is inhaled through the mouth and into the lungs, diluting the oral air and ensuring the purity of the exhaled air. The second airway then collects exhaled air produced during rapid breathing. A valve seat, in conjunction with the breathing tube, allows for multiple collections based on the exhaled air volume of individuals of different ages, facilitating the collection of effective exhaled air and improving subsequent detection accuracy. A gas equalization tank evenly mixes the two collected exhaled air samples and sends them into the detection chamber for concentration detection by hydrogen, methane, and ammonia detectors. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the detection chamber in this invention; Figure 4 This is a schematic diagram of the exhaled breath collection mechanism in this invention; Figure 5 This is a schematic diagram of the structure of the gas valve seat in this invention; Figure 6 This is a schematic diagram of the magnetorheological tube in this invention; Figure 7 This is a schematic diagram of the internal structure of the gas equalization tank in this invention; In the diagram: 1. Main unit housing; 11. Circuit board; 12. Breathing tube; 13. Detection chamber; 14. Hydrogen detector; 15. Methane detector; 16. Ammonia detector; 17. Control unit; 18. Vacuum tube; 2. Exhaled breath collection mechanism; 21. External air tube; 22. Conversion chamber; 23. Microchannel; 24. First airway; 25. Second airway; 26. Adapter sleeve; 27. Driven gear; 28. Air passage tube; 29. 3. One-way exhaust valve; 4. Gas equalizer; 5. Central channel; 6. Annular groove; 7. Branch pipe; 8. Inclined channel; 9. Exhalation chamber; 10. Central cavity; 2. Outer annular cavity; 31. Breathing tube; 42. Nitrogen tube; 53. Storage tank; 6. Valve seat; 7. Bushing; 8. Cutting sleeve; 9. Side hole; 10. Air guide groove; 11. Top support spring; 12. Magnetorheological tube; 13. Sealing shaft; 24. Piston; 35. Electromagnetic coil. Detailed Implementation
[0016] Please see Figures 1-7 In this embodiment of the invention, an exhaled breath concentration detection device includes: The main unit housing 1 has an assembly slot inside, in which the organic plate 11 is detachably fixed; Exhaled air collection mechanism 2 is installed inside the machine plate 11. One end of the exhaled air collection mechanism 2 is provided with an air inlet. A breathing tube 12 is connected to the outside of the air inlet. A breathing mask is installed at the other end of the breathing tube 12. When in use, the breathing mask can be worn on the human face. The exhaled air collection mechanism 2 can collect human exhaled air. The gas equalizer 3 is fixed on the machine plate 11 and located below the exhaled air collection mechanism 2. The gas equalizer 3 is connected to the exhaled air collection mechanism 2 through a hose so that the collected exhaled air can enter the gas equalizer 3. The detection chamber 13 is installed in the assembly tank and is connected to the exhaust port of the gas equalization tank 3. Exhaled air entering the gas equalization tank 3 can enter the detection chamber 13 through the exhaust port. The detection chamber 13 is externally connected to a hydrogen detector 14, a methane detector 15, and an ammonia detector 16. Hydrogen (H2) and methane (CH4) are almost entirely produced by the fermentation of unabsorbed carbohydrates by microorganisms in the intestines. The concentration of hydrogen and methane in exhaled air can be detected by the hydrogen detector 14 and the methane detector 15, such as in cases of lactose intolerance and fructose intolerance. If a patient's exhaled breath shows a significant increase in hydrogen or methane concentration after drinking a specific sugar solution, it indicates that the sugar was not absorbed by the small intestine but instead entered the colon where it was fermented by bacteria to produce gas, thus assessing the patient's intestinal health. Meanwhile, proteins and amino acids produce ammonia during the metabolism of cells throughout the body. Patients with cirrhosis or liver failure have impaired liver function, resulting in a decreased ability to process ammonia, leading to elevated blood ammonia levels and a significant increase in exhaled ammonia concentration. Therefore, it is an important predictive and monitoring indicator for hepatic encephalopathy.
[0017] In this embodiment, a vacuum tube 18 is connected to the outside of the detection chamber 13. The vacuum tube 18 is connected to an external vacuum pump (not shown in the figure), which facilitates the evacuation of the detection chamber 13 before the exhaled air enters the detection chamber, thereby making the detection chamber 13 a pure detection environment and avoiding the serious dilution of the sample by residual gas and air, which would lead to significantly lower detection results (dilution) or cross-interference (contamination). Therefore, before each injection of a new sample, the detection chamber is evacuated to a vacuum or near-vacuum state by the vacuum pump and vacuum tube. The hydrogen detector 14, methane detector 15, and ammonia detector 16 are all connected to the control unit 17. A thermometer is installed on the detection chamber 13. The control unit can read data from multiple sensors simultaneously. It can be connected to a display screen, buttons, or Bluetooth module to realize human-computer interaction.
[0018] In a preferred embodiment, the exhaled breath collection mechanism 2 includes: The exhalation chamber 4 has an annular wall inside, which divides the exhalation chamber into a central cavity 41 and an outer annular cavity 42. A breathing tube 43 is fixed in the central cavity 41. An external trachea 21 is fixed outside the breathing chamber 4. A switching chamber 22 is provided between the external trachea 21 and the breathing chamber 4. A plurality of microchannels 23 are distributed on one side of the switching chamber 22. The other end of the microchannels 23 is connected to the outer ring cavity 42 in the breathing chamber 4. The first airway 24 and the second airway 25 are located inside the external trachea 21. One end of the breathing tube 43 is fixed in the conversion chamber 22. The second airway 25 is sealed and connected to the breathing tube 43. The first airway 24 is sealed and connected to the conversion chamber 22 through multiple airflow branches. The exhaled air collection process is divided into two steps. First, the exhaled air generated when the user exhales steadily and deeply is collected through the first airway 24. The gas originates from the deep alveoli and has a stable composition, which best reflects the metabolic status in the blood. Then, the second airway 25 can collect the exhaled air generated during rapid breathing. The two types of exhaled air are collected in the outer ring cavity 42 and the central cavity 41, respectively. In this way, the exhaled air generated during steady deep breathing can be used as the base gas. The base gas and the exhaled air generated during rapid breathing are mixed in the gas equalization tank 3, thereby improving the accuracy of subsequent exhaled air concentration detection.
[0019] In this embodiment, one end of the first airway 24 and the second airway 25 are distributed to the left and right, and the other end of the first airway 24 and the second airway 25 are distributed in the same circle, and the second airway 25 is located inside the first airway 24. The external air tube 21 is rotatably fitted with an adapter sleeve 26, and the adapter sleeve 26 has an oblique hole. The oblique hole is adjusted to seal and connect with the first airway 24 or the second airway 25 as the adapter sleeve 26 rotates. A driven tooth 27 is coaxially fixed on the adapter sleeve 26. A control motor (not shown in the figure) is installed inside the machine plate 11. The output end of the control motor meshes with the driven tooth 27 through gear meshing. In this way, after the oblique hole on the adapter sleeve 26 is connected to the first air passage 24 and the initial collection is completed, the control motor can control the adapter sleeve 26 to rotate 180°, so that the oblique hole is connected to the second air passage 25, which facilitates the rapid second collection stage.
[0020] In this embodiment, an air passage pipe 28 is provided outside the main housing 1. One end of the air passage pipe 28 is connected to an air compressor, and the other end is sealed to the conversion chamber 22 through a one-way exhaust valve 29. This allows the medical-grade compressed air transported in the air passage pipe 28 to flow unidirectionally into the conversion chamber 22 through the one-way exhaust valve 29, and then be inhaled into the lungs through the mouth. In this way, the compressed air can flush the "dead space" of the oral cavity, pharynx, trachea, and other areas. The high concentration of oral gases (such as VOCs from food residue and microbial metabolism) that originally remained here is diluted and carried into the lungs, thereby achieving oral gas dilution before exhaled air collection and greatly reducing the possibility of subsequent exhaled air samples being contaminated. Each of the airflow branches is equipped with a one-way valve core, which can ensure that the exhaled air entering the conversion chamber 22 can flow unidirectionally into the outer ring cavity 42, preventing exhaled air backflow. A nitrogen pipe 44 is connected to the outer ring cavity 42, and a storage tank 45 is horizontally fixed in the main housing 1. One end of the storage tank 45 is connected to the nitrogen pipe 44. An exhaust port is also connected to the outer ring cavity 42. The nitrogen pipe 44 can fill the outer ring cavity 42 with nitrogen. The high-speed flowing nitrogen can effectively "wash away" the sample gas molecules remaining in the chamber, so that the residual gas in the outer ring cavity 42 can be discharged through the exhaust port after the exhaled gas collection is completed.
[0021] In this embodiment, a valve seat 5 is fixed at one end of the breathing tube 43 away from the external trachea 21. A bushing 51 is fixed inside the valve seat 5. A guide rod is slidably connected in the bushing 51. A slit sleeve 52 is slidably connected inside the breathing tube 43. A side hole 53 is opened on the side wall of the slit sleeve 52, and the other end of the guide rod is fixed to the slit sleeve 52. An air guide groove 54 is opened on the inner wall of the breathing tube 43. A support spring 55 is connected inside the bushing 51. One end of the support spring 55 is connected to the guide rod. The cut sleeve 52 is sealed against the inner wall of the breathing tube 43 by the elastic force of the support spring 55. At this time, the end of the breathing tube 43 is in a sealed state. When collecting rapid exhaled air, the cut sleeve 52 is pushed by the exhaled air flow. The exhaled air enters the cut sleeve 52 through the air guide groove 54 and the side hole 53, and then is discharged through the air valve seat 5 (the air valve seat 5 is connected to the breathing tube).
[0022] In a preferred embodiment, the breathing tube 43 has multiple through holes on its side wall, and a magnetic flux tube 6 is vertically fixed on the annular wall of the exhalation chamber 4. One end of the magnetic flux tube 6 is slidably connected to a sealing shaft 61, and the sealing shaft 61 is slidably sealed with the through holes. A piston 62 is also slidably disposed inside the magnetic flux tube 6, and magnetic flux fluid is filled between the piston 62 and the sealing shaft 61. A limiting spring is sleeved on the piston 62 (the elastic force of the limiting spring is greater than that of the top support spring 55 so that the air valve seat 5 opens first after the exhaled air enters). Therefore, in the second stage of rapid exhalation collection, the rapid exhaled air enters the breathing tube 43, and the sleeve 52 in the air valve seat 5 slides under the push of the airflow so that a part of the exhaled air can be discharged through the air valve seat 5. During this process, when the air pressure inside the breathing tube 43 is greater than the elastic force of the limiting spring, the exhaled air can push each sealing shaft 61 out of the through hole, and the exhaled air enters the central cavity 41 through each through hole. Multi-point segmented collection of continuously flowing exhaled air can be performed, which can collect the effective segment of rapid exhaled air and improve the gas collection effect. Among them, the human body mainly inhales through the nasal cavity, and the sleeve 52 can block the end of the breathing tube 43 to prevent the exhaled air from flowing back.
[0023] In this embodiment, an electromagnetic coil 63 is coaxially sleeved in the magnetohydrodynamic tube 6, and a shaft plug is fixed at one end of the sealing shaft 61 that extends into the magnetohydrodynamic tube 6. When the electromagnetic coil 63 is energized, it can effectively change the viscosity of the magnetohydrodynamic fluid, thereby adjusting the damping force of the magnetohydrodynamic fluid. Therefore, for users of different ages, with different lung capacities and breathing forces, the resulting expiratory pressure is different. By adaptively changing the magnitude of the damping force of the magnetohydrodynamic fluid, the sealing shaft 61 reaches a specific pressure trigger threshold when the exhaled air in the breathing tube 43 reaches this threshold, which corresponds precisely to the moment when alveolar gas begins to be stably output. This ensures that the gas finally collected in the central cavity 41 is the "high-quality sample" with the highest proportion of alveolar gas, making the collection process smoother and the collected gas sample more stable.
[0024] In this embodiment, a central channel 31 is provided in the middle of the gas equalization tank 3, and one end of the central channel 31 is connected to the outer annular cavity 42; an annular groove 32 is provided inside the gas equalization tank 3, and the central cavity 41 is connected to the annular groove 32 through multiple branch pipes 33. The gas equalization tank 3 has multiple inclined channels 34 evenly distributed inside. This arrangement allows the exhaled air generated during a steady, deep exhalation to flow through the central channel 31 as the base gas, while the exhaled air generated during rapid breathing is mixed into the base gas through each inclined channel 34, generating eddies and shear forces. The two gases can achieve rapid and thorough mixing at the molecular level in a very short time, improving the accuracy of subsequent detection.
[0025] In this embodiment, the inner walls of both the central cavity 41 and the outer ring cavity 42 are provided with an anti-adsorption coating to prevent gas residue.
[0026] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A device for collecting and detecting exhaled breath concentration, characterized in that, It includes: The main unit housing (1) has an assembly slot inside, in which the organic plate (11) is detachably fixed. An exhaled air collection mechanism (2) is installed inside the machine plate (11). One end of the exhaled air collection mechanism (2) is provided with an air inlet, and a breathing tube (12) is connected to the outside of the air inlet. A breathing mask is installed at the other end of the breathing tube (12). The gas equalizer (3) is fixed on the machine plate (11) and located below the exhaled air collection mechanism (2). The gas equalizer (3) is connected to the exhaled air collection mechanism (2) through a hose. The detection chamber (13) is set in the assembly tank and is connected to the exhaust port of the gas equalization tank (3). The detection chamber (13) is connected to a hydrogen detector (14), a methane detector (15) and an ammonia detector (16).
2. The exhaled breath collection and concentration detection device according to claim 1, characterized in that: The detection chamber (13) is connected to a vacuum tube (18), which is connected to an external vacuum pump. The hydrogen detector (14), methane detector (15) and ammonia detector (16) are all connected to the control unit (17), and a thermometer is installed on the detection chamber (13).
3. The exhaled breath concentration detection device according to claim 1, characterized in that: The exhaled breath collection device (2) includes: The exhalation chamber (4) has an annular wall inside, which divides the exhalation chamber into a central cavity (41) and an outer annular cavity (42). A breathing tube (43) is fixed in the central cavity (41). An external trachea (21) is fixed outside the breathing chamber (4). A switching chamber (22) is provided between the external trachea (21) and the breathing chamber (4). A plurality of microchannels (23) are distributed on one side of the switching chamber (22). The other end of the microchannels (23) is connected to the outer ring cavity (42) in the breathing chamber (4). The first airway (24) and the second airway (25) are located inside the external trachea (21). One end of the breathing tube (43) is fixed in the conversion chamber (22). The second airway (25) is sealed and connected to the breathing tube (43). The first airway (24) is sealed and connected to the conversion chamber (22) through multiple airflow branches.
4. The exhaled breath collection and concentration detection device according to claim 3, characterized in that: The first airway (24) and the second airway (25) are distributed to the left and right at one end, and the other ends of the first airway (24) and the second airway (25) are distributed in the same circle, and the second airway (25) is located inside the first airway (24); The external air tube (21) is rotatably fitted with a transition sleeve (26), and the transition sleeve (26) has an oblique hole. The oblique hole is sealed and connected with the first airway (24) or the second airway (25) during the rotation adjustment of the transition sleeve (26). The adapter sleeve (26) is coaxially fixed with a driven gear (27), and a control motor is installed inside the machine plate (11). The output end of the control motor meshes with the driven gear (27) through gear meshing.
5. The exhaled breath collection and concentration detection device according to claim 4, characterized in that: An air pipe (28) is provided outside the main housing (1). One end of the air pipe (28) is connected to the air compressor, and the other end is sealed to the conversion air chamber (22) through a one-way air outlet valve (29). A one-way valve core is provided in each of the airflow branches. The outer annular cavity (42) is connected to a nitrogen pipe (44), and a storage tank (45) is horizontally fixed in the main housing (1). One end of the storage tank (45) is connected to the nitrogen pipe (44), and an exhaust port is also connected to the outer annular cavity (42).
6. The exhaled breath collection and concentration detection device according to claim 3, characterized in that: A valve seat (5) is fixed at one end of the breathing tube (43) away from the external trachea (21). A bushing (51) is fixed inside the valve seat (5). A guide rod is slidably connected in the bushing (51). A slit sleeve (52) is slidably connected inside the breathing tube (43). A side hole (53) is opened on the side wall of the slit sleeve (52). The other end of the guide rod is fixed to the slit sleeve (52). An air guide groove (54) is opened on the inner wall of the breathing tube (43). The bushing (51) is internally connected to a support spring (55), one end of which is connected to the guide rod.
7. The exhaled breath collection and concentration detection device according to claim 6, characterized in that: The breathing tube (43) has multiple through holes on its side wall, and a magnetic flux tube (6) is vertically fixed on the annular wall of the exhalation chamber (4). One end of the magnetic flux tube (6) is slidably connected to a sealing shaft (61), and the sealing shaft (61) is slidably sealed with the through holes. A piston (62) is also slidably disposed inside the magnetic flux tube (6), and magnetic flux fluid is filled between the piston (62) and the sealing shaft (61); a limiting spring is sleeved on the piston (62).
8. The exhaled breath collection and concentration detection device according to claim 7, characterized in that: An electromagnetic coil (63) is coaxially sleeved in the magnetohydrodynamic tube (6), and a shaft plug is fixed at one end of the sealing shaft (61) that extends into the magnetohydrodynamic tube (6).
9. The exhaled breath collection and concentration detection device according to claim 3, characterized in that: The gas equalizer (3) has a central channel (31) in the middle, and one end of the central channel (31) is connected to the outer annular cavity (42); the gas equalizer (3) has an annular groove (32) inside, and the central cavity (41) is connected to the annular groove (32) through multiple branch pipes (33); The gas equalizer (3) has multiple inclined channels (34) evenly distributed inside.
10. The exhaled breath collection and concentration detection device according to claim 3, characterized in that: The inner walls of both the central cavity (41) and the outer ring cavity (42) are provided with an anti-adsorption coating.