Gas sample collection device

Abstract

The present invention relates to the technical field of medical devices, and discloses a gas sample collection device, which includes a housing and a gas collection component. The housing is provided with an air inlet and an air outlet, and internally accommodates a second chamber and a collection chamber. A buffer wall body is arranged between the collection chamber and the air outlet, and a buffer chamber is formed between the buffer wall body and the wall body of the collection chamber. The gas collection component is accommodated inside the collection chamber. The gas inhaled from the air inlet enters the collection chamber, the gas reacts with the gas collection component in the collection chamber, and then flows into the buffer chamber, and the gas sample collection device discharges the gas through the ventilation port, the second chamber and the air outlet. The buffer chamber can form a certain buffering effect on the gas, preventing the gas from flowing out of the air outlet immediately after flowing out of the air outlet channel, thereby prolonging the residence time of the gas in the collection chamber, helping the gas collection component to fully absorb the gas sample, and improving the gas collection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a gas sample collection device. Background Art

[0002] In the medical field, the method of exhalation test for diagnosing certain diseases has the characteristics of being fast, safe and painless, which is helpful for the early diagnosis and treatment of diseases. For example, for the detection of Helicobacter pylori, the tested person is orally administered with a urea drug labeled with isotope carbon ( 13 C, 14 C). After the drug enters the human body and decomposes, the isotope-labeled CO2 produced is exhaled with the breath of the tested person. The exhaled gas sample is collected, and the content of the isotope-labeled CO2 is detected to correspondingly determine whether the tested person is infected with Helicobacter pylori and the degree of infection. Usually, a gas sample collection device is used to collect the exhaled gas of the subject and then detect it. At present, due to the unreasonable structure of the gas sample collection device, the exhaled gas of the subject stays in the gas sample collection device for a short time, and the flowing gas is difficult to be fully absorbed by the sample carrier, resulting in low gas collection efficiency and inaccurate detection results. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a gas sample collection device, which can extend the residence time of gas in its collection cavity, thereby improving the gas collection efficiency.

[0004] The present invention provides a gas sample collection device, which is characterized by comprising:

[0005] A housing, provided with an air inlet, an air outlet, and internally connected with a collection cavity and a second cavity. The air inlet is communicated with the collection cavity, and the air outlet is communicated with the second cavity. A buffer wall body is arranged in the second cavity. A buffer cavity is formed between the buffer wall body and the wall body of the collection cavity. An air vent is arranged on the buffer wall body, and the buffer cavity is communicated with the second cavity through the air vent.

[0006] A gas collection member, accommodated inside the collection cavity.

[0007] As an improvement of the above technical solution, an air inlet channel and an air outlet channel are arranged on the wall body of the collection cavity. The air inlet channel communicates the first cavity and the collection cavity, and the air outlet channel communicates the collection cavity and the buffer cavity. The buffer wall body surrounds the outside of the air outlet channel, and the air vent is staggered with the air outlet channel and the air outlet in the air flow direction.

[0008] As a further improvement of the above technical solution, a first cavity is also communicated between the air inlet and the collection cavity.

[0009] As a further improvement of the above technical solution, the housing is a card-type structure with a thickness.

[0010] As a further improvement of the above technical solution, the buffer wall body is strip-shaped, the width direction thereof is consistent with the thickness direction of the housing, and both sides of the buffer wall body in the width direction are hermetically connected to the inner wall of the second chamber.

[0011] As a further improvement of the above technical solution, there are a plurality of vent holes, which are arranged along the length direction of the buffer wall body.

[0012] As a further improvement of the above technical solution, the buffer wall body has an arc-shaped structure and protrudes outward toward the air outlet direction.

[0013] As a further improvement of the above technical solution, along the airflow direction flowing from the air inlet into the collection chamber, the cross-section of the first chamber gradually expands.

[0014] As a further improvement of the above technical solution, an air inlet channel is provided between the air inlet and the first chamber, and gas can flow into the first chamber through the air inlet and the air inlet channel. Along the airflow direction flowing from the air inlet into the collection chamber, the cross-sectional area of the air inlet channel is smaller than the cross-sectional area of the first chamber.

[0015] As a further improvement of the above technical solution, an anti-backflow structure is provided in the first chamber. The anti-backflow structure is arranged between the air inlet and the collection chamber to form an obstruction to the gas flowing backward from the second chamber to the air inlet.

[0016] As a further improvement of the above technical solution, the anti-backflow structure includes a first wall body. The first wall body is arranged in the first chamber, and at least one first channel for gas to flow through is left between the first wall body and the inner wall of the first chamber.

[0017] As a further improvement of the above technical solution, the anti-backflow structure further includes a pair of second wall bodies. The second wall bodies are arranged between the first wall body and the air inlet, and a second channel for gas to flow through is left between the two second wall bodies.

[0018] The gas sample collection device according to the embodiment of the present invention has at least the following beneficial effects:

[0019] The gas inhaled from the air inlet enters the collection chamber, where the gas comes into contact with the gas collection component and reacts. After the gas flows out of the collection chamber, it enters the buffer chamber, flows into the second chamber through the ventilation ports on the buffer wall, and then flows out of the gas sample collection device from the air outlet. The buffer chamber can buffer the gas to a certain extent, preventing the gas from flowing out of the collection chamber and then directly out of the gas collection device from the air outlet. This can extend the residence time of the gas in the collection chamber, contribute to the full reaction of the gas with the gas collection component, and improve the gas collection efficiency. Description of the Drawings

[0020] Figure 1 is a schematic three-dimensional structure diagram of an embodiment of the gas sample collection device;

[0021] Figure 2 is a schematic internal structure diagram of the first embodiment of the gas sample collection device;

[0022] Figure 3 is an exploded view of the first embodiment of the gas sample collection device;

[0023] Figure 4 is a schematic internal structure diagram of the second embodiment of the gas sample collection device;

[0024] Figure 5 is an exploded view of the second embodiment of the gas sample collection device;

[0025] Figure 6 is a front view of the third embodiment of the gas sample collection device;

[0026] Figure 7 is Figure 6 a cross-sectional view taken along line A-A in

[0027] Figure 8 is Figure 7 a partial enlarged view at position I in Detailed Embodiments

[0028] The following will clearly and completely describe the concept and technical effects of the present invention in combination with the embodiments to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0029] In the description of the embodiments of the present invention, if orientation descriptions are involved, such as "upper", "lower", "front", "rear", "left", "right", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0030] In the description of the embodiments of the present invention, if a certain feature is referred to as "arranged", "fixed", "connected", "installed" on another feature, it can be directly arranged, fixed, connected on another feature, or indirectly arranged, fixed, connected, installed on another feature. In the description of the embodiments of the present invention, if "several" is involved, its meaning is more than one; if "multiple" is involved, its meaning is more than two; if "greater than", "less than", "exceeding" are involved, they should all be understood as not including the present number; if "above", "below", "within" are involved, they should all be understood as including the present number. If "first", "second" are involved, it should be understood that they are used to distinguish technical features, rather than indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0031] The gas sample collection device includes a housing. A second chamber and a collection chamber are communicated and arranged inside the housing. A gas collection member is accommodated inside the collection chamber, and the gas collection member can absorb carbon dioxide gas in the gas. The housing is provided with an air inlet and an air outlet. The air inlet is communicated with the collection chamber, the collection chamber is communicated with the second chamber, and the second chamber is communicated with the air outlet. Therefore, when the user exhales into the air inlet, the exhaled gas can enter the collection chamber, the carbon dioxide in the gas is absorbed by the gas collection member in the collection chamber, and then flows out from the air outlet, realizing the collection of the gas sample. To extend the residence time of the gas inside the housing and improve the gas collection efficiency, the following implementation manners are adopted in the embodiments of the present invention:

[0032] In the embodiments of the present invention, a buffer wall body is arranged in the second chamber. The buffer wall body is located between the collection chamber and the air outlet. Thus, a buffer chamber is formed between the buffer wall body and the wall body of the collection chamber. The buffer wall body is provided with a ventilation port, and the collection chamber is communicated with the buffer chamber. The gas flows into the buffer chamber after flowing out of the collection chamber. The buffer chamber can form a certain buffering effect on the gas, avoiding the gas flowing directly out of the gas sample collection device from the air outlet after flowing out of the collection chamber. Instead, it is intercepted by the buffer wall body in the buffer chamber, and then flows out of the buffer chamber through the ventilation port on the buffer wall body, and then flows out of the housing from the air outlet, thereby extending the residence time of the gas in the collection chamber, helping the carbon dioxide in the gas to be fully absorbed by the gas collection member, and improving the gas collection efficiency.

[0033] An air inlet channel and an air outlet channel are provided on the wall of the collection chamber. The air inlet channel communicates with the collection chamber, and the air outlet channel communicates with the collection chamber and the buffer chamber, realizing the connection between the collection chamber and the buffer chamber. The buffer wall surrounds the outside of the air outlet channel. Therefore, the gas flowing out of the collection chamber will be intercepted by the buffer wall and then flow out through the ventilation opening. The ventilation opening and the air outlet are staggered in the air flow direction. Therefore, the gas needs to flow from the ventilation opening to the air outlet to flow out of the housing, further extending the residence time of the gas in the internal cavity of the housing. The relative positions of the ventilation opening and the air outlet can be as follows: the air outlet is opposite to the middle of the length direction of the buffer wall, and the ventilation openings are provided at both ends of the buffer wall along the length direction, thus forming a relatively tortuous air flow path, which helps to extend the gas residence time. A plurality of ventilation openings can be respectively provided at both ends of the buffer wall, and the plurality of ventilation openings are arranged along the length direction of the buffer wall to make the air outlet uniform.

[0034] In some other embodiments, a first chamber is also connected between the air inlet and the collection chamber inside the housing. Along the air flow direction from the air inlet into the collection chamber, the cross-section of the first chamber perpendicular to the air flow direction gradually expands, which can increase the capacity of the first chamber, thereby increasing the amount of gas that can stay in the gas sample collection device. Thus, the gas sample collection efficiency can be effectively improved. Moreover, the air inhaled from the air inlet can be diffused and equalized in the first chamber, which helps the gas in the first chamber to uniformly enter the collection chamber and be fully absorbed by the surface of the gas collection part. The cross-sectional area of the side facing the air inlet is smaller, so the gas in the first chamber is not easily diffused backward in the direction of the air inlet.

[0035] In some other embodiments, an air inlet channel is provided between the air inlet and the first chamber, and the gas can flow into the first chamber through the air inlet and the air inlet channel. The cross-sectional area of the air inlet channel perpendicular to the air flow direction is smaller than the cross-sectional area of the first chamber perpendicular to the air flow direction, which can effectively reduce the diffusion of the gas in the gas sample collection device to the outside of the air inlet, playing a certain role in preventing backflow, helping to extend the residence time of the gas in the gas sample collection device, and thus improving the gas sample collection efficiency.

[0036] In some other embodiments, an anti-backflow structure is provided in the first chamber. The anti-backflow structure is provided between the air inlet and the collection chamber and is located near the air inlet, and is used to form an obstruction to the gas flowing out of the air inlet. Being provided in the first chamber can avoid the anti-backflow structure from obstructing the air inlet. The anti-backflow structure includes a first wall body. The first wall body is provided on the side of the first chamber adjacent to the air inlet. The first wall body extends along the direction perpendicular to the air flow direction in which the gas flows into the first chamber, so as to be able to form an obstruction to the gas flowing out towards the air inlet, and can obstruct the gas flowing back towards the air inlet to a certain extent, thus playing a role in preventing backflow to a certain extent. A first channel for gas to flow through is left between the first wall body and the first chamber, and the gas can be inhaled from the air inlet into the first chamber.

[0037] Further, the anti-backflow structure may further include a pair of second wall bodies disposed between the first wall body and the air inlet. One end of any second wall body is connected to the wall body of the first cavity, and a second channel for gas flow is left between the two second wall bodies. Thus, the backflow gas can flow out of the housing to the outside only after passing through the obstacles of the first wall body and the second wall body successively from the air inlet.

[0038] The above embodiments are applicable to gas sample collection devices of various structural types, such as cylindrical, card-type or box-shaped gas sample collection devices, and can be reasonably implemented through the above solutions. The following is a specific embodiment of a card-type gas sample collection device:

[0039] Refer to Figure 1 , which shows a three-dimensional structure of an embodiment of a gas sample collection device. The gas sample collection device includes a housing 100, which is overall in a card-type structure with a set length, width and thickness. Referring to the direction coordinates in the upper right corner of the figure, the front-back direction in the figure is the length direction of the housing, the left-right direction is the width direction of the housing, and the up-down direction is the thickness direction of the housing. A collection cavity 200 is provided inside the housing 100, and a gas collection member (not shown) is accommodated inside the collection cavity 200. The gas collection member can absorb carbon dioxide gas in the gas. An air inlet 110 and an air outlet 120 communicating with the collection cavity 200 are provided on the housing 100. Therefore, when the user exhales into the air inlet 110, the exhaled gas can reach the collection cavity 200, the carbon dioxide in the gas is absorbed by the gas collection member in the collection cavity 200, and then flows out from the air outlet 120 to realize the collection of gas samples.

[0040] Refer to Figure 2, which shows the internal structure of the first embodiment of the gas sample collection device. The gas sample collection device of this embodiment includes a housing 100. Inside the housing 100, a first chamber 300, a second chamber 400, and a collection chamber 200 are communicatively connected. The gas collection member is accommodated inside the collection chamber 200. An air inlet 110 and an air outlet 120 are provided on the housing 100. A buffer wall body 600 is provided between the collection chamber 200 and the air outlet 120. A buffer chamber 610 is formed between the buffer wall body 600 and the wall body of the collection chamber 200. An air vent 620 is provided on the buffer wall body 600; the collection chamber 200 communicates with the first chamber 300 and the buffer chamber 610. Specifically, an air inlet channel 210 and an air outlet channel 220 can be provided on the wall body of the collection chamber 200. The air inlet 110 communicates with the first chamber 300. The air inlet channel 210 communicates the first chamber 300 and the collection chamber 200. The air outlet channel 220 communicates the collection chamber 200 and the buffer chamber 610. The buffer chamber 610 communicates with the second chamber 400 through the air vent 620. The air outlet 120 communicates with the second chamber 400. Thus, an air flow path between the air inlet 110 and the air outlet 120 can be formed. The gas inhaled from the air inlet 110 reaches the first chamber 300, enters the collection chamber 200 through the air inlet channel 210. The gas contacts and reacts with the gas collection member in the collection chamber 200, and flows into the buffer chamber 610 through the air outlet channel 220, flows into the second chamber 400 through the air vent 620 on the buffer wall body 600, and then flows out of the gas sample collection device from the air outlet 120. Due to the setting of the buffer wall body 600, the gas flows into the buffer chamber 610 from the air outlet channel 220. The buffer chamber 610 can form a certain buffering effect on the gas, avoiding the gas flowing out of the gas collection device from the air outlet 120 immediately after flowing out of the air outlet channel 220, thereby prolonging the residence time of the gas in the collection chamber 200, helping the carbon dioxide in the gas to be fully absorbed by the gas collection member, and improving the gas collection efficiency.

[0041] The buffer wall 600 surrounds the gas outlet channel 220 and the gas outlet 120. Therefore, after the gas flows from the gas outlet channel 220 into the buffer chamber 610, it will be blocked by the buffer wall 600 and flow out from the position where the ventilation port 620 is provided, avoiding the gas flowing directly out of the gas outlet 120 and the buffer chamber 610 losing its buffering effect. Moreover, the ventilation port 620 and the gas outlet 120 on the housing 100 are staggered in the gas flow direction, so that there is a large distance between the two, which can extend the time for the gas to flow out of the buffer chamber 610 to flow out of the gas outlet 120, thereby extending the time for the gas to stay in the collection chamber 200, so that the gas collection component can fully absorb the sample gas. The structure of the buffer wall 600 can be various. For example, the buffer wall 600 can be strip-shaped, and its width direction is consistent with the thickness direction of the housing. And both sides of the buffer wall 600 in the width direction are hermetically connected to the inner wall of the second chamber 400, thereby forming the buffer chamber 610. The buffer wall 600 surrounds the outside of the gas outlet channel 220, and forms the buffer chamber 610 with the wall of the collection chamber 200. The gas outlet 120 is opposite to the middle part of the buffer wall 600 in the length direction, and the ventilation ports 620 are opened at both ends of the buffer wall 600 in the length direction. Therefore, the ventilation ports 620 on the buffer wall 600 and the gas outlet 120 of the housing 100 are staggered in the gas flow direction, avoiding the gas flowing directly out of the gas outlet 120 from the gas outlet channel 220. In this embodiment, the buffer wall 600 has an arc-shaped structure and protrudes outward in the direction of the gas outlet 120, which is applicable to the gas sample collection device with the collection chamber 200 set as a disc-shaped structure. The arc-shaped buffer wall 600 can form a uniform annular buffer chamber 610 between the outer sides of the walls of the collection chamber 200. Therefore, the gas flowing out of the gas outlet channel 220 can decelerate in the buffer chamber 610 and diffuse evenly, and then flow out from the ventilation ports 620 near both ends of the buffer wall 600, enter the second chamber 400, and then flow along the second chamber 400 in the direction of the gas outlet 120 and flow out of the gas sample collection device.

[0042] In a specific implementation, the middle part of the buffer wall 600 corresponds to the position of the gas outlet 120, and a plurality of ventilation ports 620 are respectively provided at both ends of the buffer wall 600, which can ensure smooth air outlet. And these ventilation ports 620 are arranged along the extending direction of the buffer wall 600, so that the air outlet is uniform, and the uniform change of the air pressure in the buffer chamber 610 can be maintained, thereby contributing to maintaining the uniform change of the gas in the collection chamber 200 and facilitating the gas collection component to absorb the gas evenly. The middle part of the buffer wall 600 is opposite to the gas outlet 120 and no ventilation port 620 is provided, which can avoid the gas flowing directly out of the buffer chamber 610 through the ventilation port 620 in the middle and the gas outlet 120 after flowing from the gas outlet channel 220 into the buffer chamber 610, resulting in the buffer chamber 610 losing its buffering effect.

[0043] The wall of the collection chamber 200 is provided with a plurality of air inlet channels 210 and a plurality of air outlet channels 220. The air inlet channels 210 are evenly arranged along the side of the collection chamber 200 facing the air inlet 110, so that the gas in the first chamber 300 can evenly enter the collection chamber 200, so that the gas can evenly cover the surface areas of the gas collection part in the collection chamber 200; the air outlet channels 220 are evenly arranged along the side of the collection chamber 200 facing the buffer chamber 610, so that the gas outlet is even, and the gas in the collection chamber 200 can be evenly distributed, so as to ensure that the carbon dioxide in the gas can be evenly absorbed by the surface of the gas collection part. The collection chamber 200 of the embodiment shown in the figure has a wall with an arc-shaped structure, and a plurality of air inlet channels 210 are evenly arranged along the length direction on the wall facing the air inlet 110, and a plurality of air outlet channels 220 are evenly arranged along the length direction on the wall facing the air outlet 120, so that the gas can evenly cover the surface areas of the gas collection part in the collection chamber 200.

[0044] The collection chamber 200 is provided with a detection window, and a covering layer (not shown) is provided on the shell 100 at a position corresponding to the detection window. The covering layer covers the outside of the detection window, the air inlet channel 210 and the air outlet channel 220 to form an absorption space between the covering layer, the wall of the collection chamber 200 and the gas collection component. Therefore, the gas entering the collection chamber 200 can be fully absorbed by the surface of the gas collection component, which helps to improve the gas collection efficiency.

[0045] The covering layer (not shown) is a solid scintillator film or a solid scintillator sheet having a solid scintillator. The gas sample to be detected in the gas collection member can excite the solid scintillator on the covering layer to make the solid scintillator emit a light signal for detection by the scintillation detector. In other embodiments of the present invention, the covering layer can also be set as a soft film or sheet or a hard cover plate without a solid scintillator. In this scheme, in order to achieve the purpose of detection, the solid scintillator can be set in other forms, for example, a granular solid scintillator can be attached to the gas collection member.

[0046] The gas collection piece can absorb carbon dioxide in the gas, and can be made of a cotton or non-woven fabric substrate plus an adsorbent that can be used to absorb carbon dioxide gas, and is used to absorb carbon dioxide in the exhaled gas of the subject. The gas flowing into the first cavity 300 from the air inlet 110 enters the collection cavity 200 through the air inlet channel 210, flows through the surface of the gas collection piece, and then flows out of the collection cavity 200 through the air outlet channel 220. When the gas is in the collection cavity 200, the carbon dioxide in the gas is absorbed by the gas collection piece, thereby realizing the collection of gas samples.

[0047] Figure 4 is a schematic diagram of the internal structure of the second embodiment of the gas sample collection device, Figure 5 is an exploded view of the second embodiment of the gas sample collection device, and also refers toFigure 4 , 5 , based on the above embodiment, the gas sample collection device of this embodiment has a card-like structure as a whole. In the figure, the up-down direction is marked as the thickness direction of the housing, the left-right direction is marked as the width direction of the housing, and the front-back direction is marked as the length direction of the housing. Inside the housing, an anti-backflow structure 500 is further provided in the first chamber 300. The anti-backflow structure 500 is arranged between the air inlet 110 and the collection chamber 200 and is used to form an obstruction to the gas flowing out of the air inlet 110. It should be noted that the "obstruction" here does not completely block the flow of the air current, but forms a resistance to the gas flowing out from the first chamber 300 to the air inlet 110 to a certain extent, increasing the difficulty of gas backflow, so that the residence time of the gas inside the gas sample collection device can be extended, which helps the gas to fully contact the gas collection member, thereby improving the gas sample collection efficiency. At the same time, it effectively reduces the backflow of internal medicine particles and other substances by the user. Moreover, the anti-backflow device is arranged in the first chamber to avoid obstructing the intake of the air inlet 110 and ensure smooth exhalation of the user.

[0048] The anti-backflow structure 500 includes a first wall body 510. The position of the first wall body 510 is closer to the air inlet 110 than the middle of the first chamber 300 and is located on the flow path of the backflow air current in the first chamber 300, forming a blocking wall intercepting between the air inlet 110 and the collection chamber 200. Its structure can be a straight wall body extending towards the two side wall bodies of the first chamber 300, or a wall body with an arc structure, or other feasible shapes. A first channel 530 for gas circulation is left between the first wall body 510 and at least one side wall body in the width direction of the first chamber 300, so that the gas entering from the air inlet 110 can reach the collection chamber 200. The first wall body 510 of this embodiment is an arc-shaped wall body, and its concave side faces the collection chamber 200. Therefore, when the backflow air current flows out from the collection chamber 200 towards the air inlet 110 direction, it will be obstructed by the first wall body 510 in the first chamber 300. The concave arc-shaped wall body increases the obstruction and can better intercept most of the medicine, particles and other substances flowing out together with the backflow air current. Correspondingly, the convex arc surface of the first wall body 510 faces the air inlet 110, which can reduce the resistance of the first wall body 510 to the gas entering from the air inlet 110, ensure the stability of the intake air current, and effectively avoid the occurrence of turbulence. At this time, if backflow occurs, the gas flowing from the collection chamber 200 and the first chamber 300 towards the air inlet 110 direction will be blocked by the first wall body 510 during the flow process, playing an anti-backflow role.

[0049] A first channel 530 for gas circulation is left between the first wall body 510 and the two side wall bodies of the first chamber 300. Therefore, the gas can flow deeper into the first chamber 300 from the first channels 530 on both sides of the first wall body 510, which helps to keep the gas evenly enter the collection chamber 200.

[0050] For the gas sample collection device of this embodiment, the anti-backflow structure 500 further includes a pair of second wall bodies 520. The second wall bodies 520 are arranged between the first wall body 510 and the air inlet 110. The first ends 521 of the respective second wall bodies 520 are respectively connected to the two side wall bodies of the first chamber 300. A second channel 540 for gas flow is left between the second ends 522 of the respective second wall bodies 520. After the gas inhaled from the air inlet 110 enters the first chamber 300, it can reach the deeper interior of the first chamber 300 through the second channel 540 and the first channel 530, and thus enter the collection chamber 200. When the backflow air flow flows through the first channel 530 towards the air inlet 110, it will be blocked by the second wall body 520 and needs to bypass the second wall body 520 and flow out through the second channel 540.

[0051] The second channel 540 is located between the first wall body 510 and the air inlet 110. Therefore, the backflow gas needs to first bypass the first wall body 510 and pass through the first channel 530, and then bypass the second wall body 520 and enter the second channel 540. Therefore, the backflow gas will not directly flow towards the air inlet 110 through the second channel 540, effectively intercepting most of the medicaments or particles.

[0052] The second ends 522 of the second wall bodies 520 can be set to be curved towards the side of the detection chamber to form an arc shape. Thus, when the backflow air flow passes by, the concave arc surface of the second wall body 520 can form a relatively large resistance and has the effect of guiding the air flow towards the inner side of the arc, effectively reducing the gas flowing from the second channel 540 towards the air inlet 110. Thereby, the residence time of the gas in the collection chamber can be prolonged, which helps to improve the collection efficiency of the gas sample. At the same time, the medicaments or particles flowing out of the air inlet 110 along with the backflow air flow are reduced.

[0053] Figure 6 It is the front view of the third embodiment of the gas sample collection device. Figure 7 It is Figure 6 the cross-sectional view taken along line A-A in Figure 8 It is Figure 7 the partial enlarged view at position I in and also refer to Figures 6 to 8, on the basis of any of the above embodiments, the gas sample collection device of this embodiment further improves the structure of the first chamber 300. The housing of the gas sample collection device of this embodiment is a card-type structure as a whole. In the figure, the up-down direction is marked as the thickness direction of the housing, the left-right direction is marked as the width direction of the housing, and the front-back direction is marked as the length direction of the housing. In this embodiment, the width of the first chamber 300 gradually increases from the end facing the air inlet 110 to the end facing the collection chamber 200, increasing the volume of the first chamber 300, thereby increasing the amount of gas that the gas sample collection device can accommodate. If the internal cavity space of the gas sample collection device is too small, when the user exhales into the air inlet 110, after the gas enters the first chamber 300, it will immediately flow out through the collection chamber 200, the second chamber 400, and the air outlet 120, resulting in low gas utilization rate. After the user stops exhaling into the air inlet 110, due to the too small internal cavity space, the amount of gas that can stay in the gas sample collection device is small, making it difficult for the gas collection member to absorb enough gas. Therefore, the user may need to exhale multiple times, and the collection efficiency is low. The first chamber 300 of this embodiment can accommodate more gas. Therefore, during the process of the user exhaling into the air inlet 110 and after stopping exhaling into the air inlet 110, the inside of the gas sample collection device can accommodate more gas, thereby improving the gas utilization rate and the gas sample collection efficiency.

[0054] An air inlet channel 150 is provided between the air inlet 110 and the first chamber 300. Along the thickness direction of the housing 100, the height of the air inlet channel 150 is less than the height of the first chamber 300, thereby forming a constricted channel at the air inlet channel 150, which can effectively reduce the diffusion of the gas in the gas sample collection device to the outside of the air inlet 110, playing a certain role in preventing backflow, prolonging the residence time of the gas in the gas sample collection device, and thus improving the gas sample collection efficiency. Similarly, along the up-down direction, the height of the first chamber 300 increases, which can increase the capacity of the first chamber 300, thereby increasing the amount of gas that can stay in the gas sample collection device. Thus, the gas sample collection efficiency can be effectively improved. Moreover, the air inhaled from the air inlet 110 can diffuse and equalize pressure in the first chamber 300, which helps the gas in the first chamber 300 to uniformly enter the collection chamber 200 and be fully absorbed by the surface of the gas collection member.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art in the said technical field, various changes can be made without departing from the purpose of the present invention. In addition, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A gas sample collection device, characterized in that, Comprising: A housing provided with an air inlet, an air outlet, and internally connected with a collection chamber and a second chamber. The air inlet is communicated with the collection chamber, and the air outlet is communicated with the second chamber. An air inlet passage and an air outlet passage are provided on the wall of the collection chamber. A buffer wall is arranged in the second chamber. The buffer wall is strip-shaped, surrounds the outside of the air outlet passage, and forms a buffer chamber with the wall of the collection chamber. The two sides of the buffer wall in the width direction are hermetically connected to the inner wall of the second chamber. The air inlet passage communicates with the collection chamber, the air outlet passage communicates with the collection chamber and the buffer chamber. Ventilation openings are provided at both ends of the buffer wall in the length direction. The middle part of the buffer wall in the length direction is opposite to the air outlet. The buffer chamber is communicated with the second chamber through the ventilation openings. A gas collection member accommodated inside the collection chamber.

2. The gas sample collection device according to claim 1, wherein The ventilation openings are staggered from the air outlet passage and the air outlet in the air flow direction.

3. The gas sample collection device according to claim 1, characterized in that, A first chamber is also communicated between the air inlet and the collection chamber. The air inlet passage communicates with the first chamber and the collection chamber.

4. The gas sample collection device according to any one of claims 1-3, characterized in that, The housing is a card-type structure with a thickness.

5. The gas sample collection device according to claim 4, wherein The buffer wall is strip-shaped, and its width direction is the same as the thickness direction of the housing. The two sides of the buffer wall in the width direction are hermetically connected to the inner wall of the second chamber.

6. The gas sample collection device according to claim 5, characterized in that, There are several ventilation openings, which are arranged along the length direction of the buffer wall.

7. The gas sample collection device according to claim 5, characterized in that, The buffer wall is in an arc-shaped structure and protrudes outward towards the air outlet direction.

8. The gas sample collection device according to claim 3, characterized in that, Along the air flow direction flowing from the air inlet into the collection chamber, the cross-section of the first chamber gradually expands.

9. The gas sample collection device according to claim 3, characterized in that, An air inlet passage is arranged between the air inlet and the first chamber. Gas can flow into the first chamber through the air inlet and the air inlet passage. The cross-sectional area of the air inlet passage is smaller than the cross-sectional area of the first chamber along the air flow direction flowing from the air inlet into the collection chamber.

10. The gas sample collection device according to claim 3, characterized in that, An anti-backflow structure is arranged in the first chamber. The anti-backflow structure is arranged between the air inlet and the collection chamber to form an obstacle to the gas flowing back from the second chamber to the air inlet.

11. The gas sample collection device according to claim 10, characterized in that, The anti-backflow structure includes a first wall arranged in the first chamber and leaving at least one first passage for gas flow between the first wall and the inner wall of the first chamber.

12. The gas sample collection device according to claim 11, wherein, The anti-backflow structure further includes a pair of second walls arranged between the first wall and the air inlet, and a second passage for gas flow is left between the two second walls.

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