Human respiratory gas sampling and detecting device

Abstract

The utility model discloses a human respiratory gas sampling and detecting device, and relates to the technical field of respiratory gas detecting devices, the human respiratory gas sampling and detecting device comprises a blowing nozzle, a thermal desorption adsorption tube, a heating module, a detecting cavity, a gas sensitive sensor and an air exhaust unit, the blowing nozzle is constructed to receive human blowing gas or respiratory gas and guide the gas to the thermal desorption adsorption tube; an inlet of the thermal desorption adsorption pipe is communicated with an outlet of the blowing nozzle; the heating module is configured to heat the thermal desorption adsorption tube; the detection cavity is communicated with an outlet of the thermal desorption adsorption tube; the gas sensitive sensor is arranged in the detection cavity; the purpose of reducing the size of the instrument is achieved by using a gas sensitive sensor detection method, target gas at the blowing nozzle is pumped into the thermal desorption adsorption tube by using the gas pumping unit, and VOCs in the target gas are enriched by using the thermal desorption adsorption tube, so that the problems that the VOCs are collected slowly due to low breathing gas flow speed, and the detection efficiency is low are solved. And the low concentration is not beneficial to rapid detection.

Description

Technical Field

[0001] This utility model relates to the technical field of respiratory gas detection devices, and in particular to a human respiratory gas sampling and detection device. Background Technology

[0002] Biological weapons are primarily released in the form of aerosols, which diffuse in the air and pose a threat to humans through the respiratory tract, skin, and digestive tract. The respiratory tract is extremely susceptible to microbial aerosols, and the infectious dose is much lower than through other routes.

[0003] Currently, there is a lack of rapid, non-invasive monitoring methods for respiratory infections. Human breath contains thousands of trace amounts of volatile organic compounds (VOCs). Some researchers abroad have used VOCs in breath to differentiate between viral and bacterial respiratory infections, achieving sensitivity and specificity of over 90%.

[0004] Existing VOCs detection instruments generally use GC-MS, which have the disadvantages of being heavy and difficult to carry. Therefore, this utility model proposes a human respiratory gas sampling and detection device. Utility Model Content

[0005] The purpose of this invention is to provide a human respiratory gas sampling and detection device to solve the problems existing in the prior art, reduce the size of the instrument, and achieve rapid detection.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a human respiratory gas sampling and detection device, comprising:

[0008] The mouthpiece is designed to receive exhaled or breathed air from the human body and guide the gas to the thermal desorption adsorption tube.

[0009] The inlet of the thermal desorption adsorption tube is connected to the outlet of the nozzle;

[0010] A heating module is configured to heat the thermal desorption adsorption tube;

[0011] The detection chamber is connected to the outlet of the thermal desorption adsorption tube;

[0012] A gas-sensitive sensor is disposed inside the detection cavity;

[0013] The air extraction unit has an air extraction port that is connected to the detection chamber and can generate negative pressure in the thermal desorption adsorption tube and the nozzle.

[0014] Preferably, when multiple thermal desorption adsorption tubes are provided, the heating module is configured to heat each of the multiple thermal desorption adsorption tubes separately.

[0015] Preferably, it also includes a cleaning line, which is connected to the detection chamber and used to blow nitrogen into the detection chamber.

[0016] Preferably, it also includes a cooling module configured to cool the thermal desorption adsorption tube.

[0017] Preferably, the adsorbent in the thermal desorption adsorption tube is Tenax-TA and activated carbon.

[0018] Preferably, the adsorbent in the thermal desorption adsorption tube is a combination of Tenax-TA and activated carbon in equal proportions.

[0019] Preferably, the heating module includes an electric heating layer, and the thermal desorption adsorption tube is covered with the electric heating layer.

[0020] Preferably, when multiple thermal desorption adsorption tubes are provided, the nozzle is connected to multiple thermal desorption adsorption tubes through a multi-port connector, and the multi-port connector is used to connect to the tube head of the thermal desorption adsorption tube and is provided with an on / off valve.

[0021] The present invention achieves the following technical advantages over the prior art:

[0022] This invention achieves the goal of reducing the size of the instrument by using a gas-sensitive sensor for detection. It uses a pumping unit to draw the target gas from the mouthpiece into a thermal desorption adsorption tube, and uses the thermal desorption adsorption tube to enrich the VOCs in the target gas. This solves the problem that the slow collection of VOCs and the low concentration caused by the low breathing airflow rate are not conducive to rapid detection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 Structural block diagram of the human respiratory gas sampling and detection device provided in the embodiments of this utility model;

[0025] Figure 2 A schematic diagram of the structure of a human respiratory gas sampling and detection device provided in one embodiment of the present invention;

[0026] Figure 3This is a schematic diagram of a human respiratory gas sampling and detection device provided in another embodiment of the present invention, wherein the on / off valve is located outside the housing to facilitate control of the state of the on / off valve;

[0027] In the diagram: 1-Nose; 2-Thermal desorption adsorption tube; 3-Gas sensor; 4-Cleaning pipeline; 5-Air extraction unit; 6-Multi-port connector; 7-On / off valve; 8-Heating module. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] This utility model provides a human respiratory gas sampling and detection device, such as... Figure 1 As shown, it includes: a nozzle, a thermal desorption adsorption tube, a heating module 8, a detection chamber, a gas sensor, and a pumping unit.

[0031] The mouthpiece is configured to receive human breath or exhaled air and guide the gas to the thermal desorption adsorption tube; preferably, it adopts an outward expansion structure to facilitate better collection of human breath or exhaled air. In this invention, human breath refers to the gas blown out of the human mouth, and exhaled air refers to the gas exhaled from the human nose. It is preferably a disposable mouthpiece.

[0032] The inlet of the thermal desorption adsorption tube and the outlet of the nozzle are connected; however, in some embodiments, when it is not convenient to directly connect and communicate the inlet of the thermal desorption adsorption tube 2 and the nozzle 1, an intermediate connecting tube is required to connect the two.

[0033] The heating module 8 is configured to heat the thermal desorption adsorption tube 2; the heating module 8 can be any of the existing technologies, such as resistance heating, by covering the thermal desorption adsorption tube 2 with an electric heating layer; or, for example, a hot water jacket is provided outside the thermal desorption adsorption tube 2, and the thermal desorption adsorption tube 2 is heated by introducing hot water to release volatile substances in the thermal desorption adsorption tube 2.

[0034] The detection chamber is connected to the outlet of the thermal desorption adsorption tube 2.

[0035] The gas sensor 3 is disposed within the detection chamber, which provides a space for gas detection. The gas sensor 3 can be selected to detect alkanes such as toluene, formaldehyde, and methane, as well as aldehydes and ketones. However, it is not limited to these types; the specific type must be selected according to the required specifications.

[0036] The suction port of the suction unit 5 is connected to the detection chamber and can generate negative pressure in the thermal desorption adsorption tube 2 and the nozzle 1. The suction unit 5 is preferably an air pump.

[0037] During use, the user blows air through the mouthpiece 1, and the gas is enriched through the thermal desorption adsorption tube 2. During blowing, the flow rate is controlled by the extraction unit 5 to ensure a uniform flow rate and volume. After gas collection, the adsorption tube is heated by the heating module 8, causing VOCs to be released. The gas is then pushed closer to the gas sensor 3 by the extraction unit 5, and the gas sensor 3 is used to detect the gas.

[0038] In this invention, multiple thermal desorption adsorption tubes 2 can be provided, or only one can be provided. When one tube is provided, a nozzle 1 is also provided, and the two are connected by an intermediate connecting tube.

[0039] like Figure 1 As shown, when multiple thermal desorption adsorption tubes 2 are set and only one nozzle 1 is set, only a portion of the thermal desorption adsorption tubes 2 can be connected at a time. For example, the nozzle 1 can be connected to one thermal desorption adsorption tube 2 each time. After the first thermal desorption adsorption tube 2 is enriched, the next thermal desorption adsorption tube 2 can be switched to be connected to the nozzle 1. This setting can speed up the detection efficiency and detect multiple people at the same time.

[0040] Specifically, when the thermal desorption adsorption tube 2 is provided with multiple tubes, such as... Figure 2 and Figure 3 As shown, the nozzle 1 is connected to multiple thermal desorption adsorption tubes 2 via a multi-port connector 6. The multi-port connector 6 is used to connect to the thermal desorption adsorption tubes 2, and an on / off valve 7 is installed inside the tube head. This allows switching the connection between the nozzle and any one of the thermal desorption adsorption tubes 2. The on / off valve 7 can be a manual valve or an electric valve, etc. When it is a manual valve, it is preferred to use... Figure 3 The scheme shown has an on / off valve 7 located outside the housing for easy manual adjustment.

[0041] In addition, multiple nozzles 1 can be set to correspond to multiple thermal desorption adsorption tubes 2. For example, a blowing tube can be led out from each thermal desorption adsorption tube 2. Disposable nozzles 1 can be installed on the blowing tube. Under normal circumstances, the nozzles 1 are not installed on the blowing tube and can be sealed by certain means. When testing is required, the nozzles 1 are installed on the corresponding blowing tube.

[0042] In some embodiments, when multiple thermal desorption adsorption tubes 2 are provided, the heating module 8 is configured to heat each of the multiple thermal desorption adsorption tubes 2.

[0043] In this embodiment, each thermal desorption adsorption tube 2 can be coated with an electric heating layer, and then each electric heating layer can be independently controlled to heat each thermal desorption adsorption tube 2.

[0044] Considering that the thermal desorption adsorption tube 2 and the gas sensor 3 in the above embodiments need to be reused, in some embodiments of this invention, a cleaning pipeline 4 is also included. The cleaning pipeline 4 is connected to the detection chamber and is used to blow nitrogen gas into the detection chamber, which is then extracted by the pumping unit 5, and this process is repeated several times. The nitrogen gas is preferably high-purity nitrogen gas, which is used to clean the gas sensor 3 to improve the accuracy of the next detection.

[0045] When it is necessary to clean the thermal desorption adsorption tube 2, nitrogen gas is introduced into the thermal desorption adsorption tube 2 and then extracted using the pumping unit 5. This process is repeated several times to complete the cleaning.

[0046] In some embodiments, the gas sensor can transmit the detected information to a user's computer or other devices via wired or wireless signals. When using wired signals, a corresponding cable hole needs to be provided for the cable to pass through, and the cable needs to be sealed.

[0047] In some embodiments, the present invention further includes a cooling module configured to cool the thermal desorption adsorption tube 2.

[0048] The cooling module in this embodiment can adopt a water-cooled or air-cooled structure. When water cooling is used, a water-cooled pipe needs to be installed on the inner wall of the outer shell or the outer wall of the thermal desorption adsorption tube 2. Of course, the water-cooled pipe needs to be installed on the inner side of the electric heating layer and a water-cooled circulation system is configured to provide circulating cold water.

[0049] When air cooling is used, a fan is directly installed on the outer casing to extract the heat inside to the outside. When no fan is installed, the heat can also be extracted from the detection chamber and the thermal desorption adsorption tube 2 by the air extraction unit 5.

[0050] The above-mentioned outer shell is the outer shell in the common sense, which is used to protect the internal components. Specifically, in this utility model, the outer shell integrates a thermal desorption adsorption tube 2, a heating module 8, a gas sensor 3, etc.

[0051] The thermal desorption adsorption tube 2 and the gas sensor 3 can be installed in the housing in a conventional way. For example, a space can be constructed inside the housing to accommodate and connect the thermal desorption adsorption tube 2 and the gas sensor 3 (in particular, multiple pipes, boxes, etc. can be set inside the housing to construct the space. The pipes and boxes can be fixed inside the housing using existing technologies, such as by using brackets). Then, the thermal desorption adsorption tube 2 and the gas sensor 3 can be placed inside the housing.

[0052] In some embodiments, the adsorbent in the thermal desorption adsorption tube 2 is Tenax-TA and activated carbon.

[0053] Preferably, the adsorbent in the thermal desorption adsorption tube 2 is a combination of Tenax-TA and activated carbon in equal proportions to eliminate the influence of water vapor in the breath.

[0054] The usage method of the embodiment having a cooling module and a cleaning module is as follows:

[0055] During use, the user blows air through the mouthpiece 1, and the gas is enriched through the thermal desorption adsorption tube 2. During blowing, the flow rate is controlled by the extraction unit 5 to ensure a uniform flow rate and volume. After gas collection, the adsorption tube is heated by the heating module 8, causing VOCs to be released. The gas is then pushed closer to the gas sensor 3 by the extraction unit 5, where it is detected. After detection, the thermal desorption adsorption tube 2 is cooled by the cooling module, and then flushed with high-purity nitrogen through the cleaning pipeline 4. Finally, the waste gas is extracted by the extraction unit 5.

[0056] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A human respiratory gas sampling and detection device, characterized in that: include: The mouthpiece is designed to receive exhaled or breathed air from the human body and guide the gas to the thermal desorption adsorption tube. The inlet of the thermal desorption adsorption tube is connected to the outlet of the nozzle; A heating module is configured to heat the thermal desorption adsorption tube; The detection chamber is connected to the outlet of the thermal desorption adsorption tube; A gas-sensitive sensor is disposed inside the detection cavity; The air extraction unit has an air extraction port that is connected to the detection chamber and can generate negative pressure in the thermal desorption adsorption tube and the nozzle.

2. The human respiratory gas sampling and detection device according to claim 1, characterized in that: When multiple thermal desorption adsorption tubes are provided, the heating module is configured to heat each of the multiple thermal desorption adsorption tubes separately.

3. The human respiratory gas sampling and detection device according to claim 1, characterized in that: It also includes a cleaning line that is connected to the detection chamber and is used to blow nitrogen into the detection chamber.

4. The human respiratory gas sampling and detection device according to claim 1, characterized in that: It also includes a cooling module configured to cool the thermal desorption adsorption tube.

5. The human respiratory gas sampling and detection device according to claim 2, characterized in that: The heating module includes an electric heating layer, and the thermal desorption adsorption tube is covered with the electric heating layer.

6. The human respiratory gas sampling and detection device according to claim 1, characterized in that: When multiple thermal desorption adsorption tubes are provided, the nozzle is connected to multiple thermal desorption adsorption tubes through a multi-port connector, and the multi-port connector is used to connect to the tube head of the thermal desorption adsorption tube, which is equipped with an on / off valve.

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