CN112568895A

CN112568895A - Gas sampler

Info

Publication number: CN112568895A
Application number: CN202011311829.5A
Authority: CN
Inventors: 李永振; 郭瑞华; 朱小锋; 朱佐刚; 赵丹; 马驰; 王涛; 户文成
Original assignee: Beijing Municipal Institute of Labour Protection
Current assignee: Beijing Municipal Institute of Labour Protection
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-03-30

Abstract

An embodiment of the present invention provides a gas sampler, including: the device comprises a mask, a shell, a sampling pipe, a gas supply unit and a pumping unit. The sampling tube is communicated with the pumping unit. The gas sampler can comprehensively collect volatile organic compounds and other micro particles in exhaled gas, is convenient for doctors to analyze specific components and characteristics of the volatile organic compounds and other micro particles, and judges whether early biological characteristics of common diseases exist, so that the diseases are prevented and treated in advance. Meanwhile, the gas sampler has high universality.

Description

Gas sampler

Technical Field

The invention relates to the technical field of gas sampling and detecting equipment, in particular to a gas sampler.

Background

The exhaled air of the human body usually contains thousands of Volatile Organic Compounds (VOCs) and other minute particles. Most of these exhaled gases come from respiratory tract and lung, and are effective indicators of biological information in human body. By analyzing the specific components and characteristics of the exhaled air, the method can be used for judging whether the early biological characteristics of common diseases exist, so that the diseases can be prevented and treated in advance. The disease detection mode is different from the detection mode of taking blood or tissue samples such as liquid and tissue biopsy and the like. The disease detection mode provides a completely non-invasive solution, and can improve the comfort of the patient to the maximum extent.

At present, most of common exhaled air samplers are only used for collecting Volatile Organic Compounds (VOC), and the universality is poor. Meanwhile, the existing gas sampler is used for sample collection and analysis in a laboratory and is inconvenient to carry.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a gas sampler.

The invention provides a gas sampler, comprising: the device comprises a mask, a shell, a sampling pipe, a gas supply unit and a pumping unit.

The mask is connected with the shell and communicated with the shell, the gas supply unit penetrates through the shell and is communicated with the mask, the pumping unit is arranged in the shell, and the sampling pipe is communicated with the pumping unit.

According to the gas sampler provided by the invention, the gas supply unit comprises a gas supply pipeline and a gas source, the gas supply pipeline penetrates through the shell to be communicated with the mask, and the gas source is arranged outside the shell and is connected with the gas supply pipeline so as to supply oxygen into the mask.

According to the gas sampler provided by the invention, the pumping unit comprises a diaphragm pump and a delivery pipe, the diaphragm pump and the delivery pipe are both arranged in the shell, one end of the delivery pipe is connected with the diaphragm pump, and the other end of the delivery pipe is connected with the sampling pipe.

According to the gas sampler provided by the invention, the sampling pipe is detachably inserted on the shell and is communicated with the delivery pipe through the shell.

According to the gas sampler provided by the invention, a plurality of sampling pipes are arranged, and the plurality of sampling pipes are inserted in the shell side by side and are communicated with the conveying pipe through the shell.

According to the present invention, there is provided a gas sampler further comprising a one-way valve mounted on the housing to vent excess exhaled gas to the external environment.

According to the gas sampler provided by the invention, the carbon dioxide concentration sensor is arranged in the mask.

According to the gas sampler provided by the invention, the gas sampler comprises a head band used for fixing the gas sampler on the face of a human body, and the head band is arranged on the face mask and can be adjusted in tightness.

According to the gas sampler provided by the invention, the shape of the face mask is matched with that of the human face so as to enable the face mask to be attached to the human face, and the face mask is made of a silica gel material.

According to the gas sampler provided by the invention, the sampling pipe is made of stainless steel materials.

In the gas sampler provided by the invention, the mask is connected with the shell and communicated with the shell, the gas supply unit passes through the shell and is communicated with the mask, the pumping unit is arranged in the shell, and the sampling pipe is communicated with the pumping unit.

Compared with the prior art, the gas sampler can collect Volatile Organic Compounds (VOC) and other small particles in exhaled gas, so that doctors can conveniently analyze specific components and characteristics of the Volatile Organic Compounds (VOC) and other small particles and judge whether early biological characteristics of common diseases exist, and accordingly, the diseases can be prevented and treated in advance. A completely non-invasive solution can be provided, maximizing the comfort of the patient.

Simultaneously, Volatile Organic Compounds (VOC) and other tiny particles in the gas exhaled by the patient can be adsorbed in the filler of the sampling tube, so that the doctor can conveniently and comprehensively collect and analyze the gas. The gas sampler has high universality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the external structure of a gas sampler provided in the present invention;

fig. 2 is a schematic diagram of the internal structure of the gas sampler provided by the present invention.

Reference numerals:

100: a face mask; 200: a housing; 300: a sampling tube;

400: a gas supply line; 500: a diaphragm pump; 600: a delivery pipe;

700: a one-way valve.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification to make the purpose, technical solution, and advantages of the embodiments of the present invention more clear, and the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A gas sampler provided by an embodiment of the present invention will be described with reference to fig. 1 to 2. It should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.

An embodiment of the present invention provides a gas sampler, as shown in fig. 1 and 2, including: mask 100, housing 200, sampling tube 300, gas supply unit and pumping unit.

Wherein the mask 100 is connected to the housing 200 and is in communication with the housing 200, the gas supply unit is in communication with the mask 100 through the housing 200, the pumping unit is disposed inside the housing 200, and the sampling tube 300 is in communication with the pumping unit.

In use, the mask 100 is worn on a person's face and the gas supply unit provides oxygen to the patient. The patient's expired gases flow downstream into housing 200 and are powered by a pumping unit to draw the patient's expired gases into sampling tube 300. Volatile Organic Compounds (VOC) and other fine particles in the exhaled breath are adsorbed in the packing of the sampling tube 300, and the sampling tube 300 is removed for sampling. By analyzing the specific components and characteristics of Volatile Organic Compounds (VOC) and other micro-particles in the exhaled air, whether early biological characteristics of common diseases exist or not is judged, so that the diseases are prevented and treated early.

Meanwhile, Volatile Organic Compounds (VOC) and other micro particles in the exhaled air of the patient can be adsorbed in the filler of the sampling tube 300, so that the doctor can conveniently and comprehensively collect and analyze the gas. Therefore, the gas sampler has high universality.

For example, in one embodiment of the present invention, the mask 100 is shaped to conform to the shape of a human face so that the mask 100 conforms to the human face, and the mask 100 is made of a silicone material.

The shape of the mask 100 is matched with the shape of the human face so that the mask 100 is attached to the human face, and therefore the fact that air in the external environment cannot enter the mask 100 from the edge of the mask 100 to pollute gas exhaled by a patient can be effectively guaranteed, and accuracy of a detection result is affected. Meanwhile, the gas exhaled by the patient cannot leak from the edge of the mask 100 to cause the external environment, so that comprehensive and accurate sampling is realized. In addition, the mask 100 is made of soft silicone material, which can greatly improve the comfort of the patient during sampling.

In one embodiment of the present invention, as shown in FIG. 2, the gas supply unit includes a gas supply line 400 passing through the shell 200 and communicating with the mask 100, and a gas source disposed outside the shell 200 and connected to the gas supply line 400 to supply oxygen into the mask 100.

For example, the mask 100 is connected to the housing 200 and communicates with the housing 200. A gas supply line 400 passes through the housing 200 and communicates with the mask 100, and a gas source is disposed outside the housing 200 and is connected to the gas supply line 400 to supply oxygen into the mask 100. A pumping unit is disposed within housing 200, and sampling tube 300 is in communication with the pumping unit.

It should be noted here that the gas source may be a portable oxygen cylinder, and the patient may carry out sampling operation on the oxygen cylinder; the air source can also be an air source.

It should also be noted herein that the gas supply line 400 includes, but is not limited to, a hose.

In use, the patient wears the mask 100 on his or her face with the patient carrying a portable oxygen cylinder, which provides oxygen to the patient via the gas supply line 400. The patient's expired gases flow downstream into housing 200 and are powered by a pumping unit to draw the patient's expired gases into sampling tube 300. Volatile Organic Compounds (VOC) and other fine particles in the exhaled breath are adsorbed in the packing of the sampling tube 300, and the sampling tube 300 is removed for sampling. By analyzing the specific components and characteristics of Volatile Organic Compounds (VOC) and other micro-particles in the exhaled air, whether early biological characteristics of common diseases exist or not is judged, so that the diseases are prevented and treated early.

According to the embodiment described above, the sampler can effectively collect the expired gas of the patient, and the patient can carry on sampling detection by the portable gas source outside the laboratory or other required environments, so that the portability and universality of the gas sampler are improved.

In one embodiment of the present invention, the pumping unit comprises a diaphragm pump 500 and a delivery tube 600, both the diaphragm pump 500 and the delivery tube 600 are placed inside the housing 200, and one end of the delivery tube 600 is connected to the diaphragm pump 500 and the other end is connected to the sampling tube 300.

Specifically, the mask 100 is connected to the housing 200 and communicates with the housing 200. A gas supply line 400 passes through the housing 200 and communicates with the mask 100, and a gas source is disposed outside the housing 200 and is connected to the gas supply line 400 to supply oxygen into the mask 100. Diaphragm pump 500 and delivery pipe 600 are all placed inside housing 200, and one end of delivery pipe 600 is connected with diaphragm pump 500, and the other end is connected with sampling pipe 300.

It should be noted herein that the above-mentioned delivery pipe 600 includes, but is not limited to, a hose.

During a sampling operation, the patient wears the mask 100 on his or her face by carrying a portable oxygen cylinder on his or her back, which provides oxygen to the patient via the gas supply line 400. The patient's exhaled gases flow downstream into the housing 200. Gas exhaled by the patient is drawn into sample tube 300 by delivery tube 600 under the action of diaphragm pump 500. Volatile Organic Compounds (VOC) and other fine particles in the exhaled breath are adsorbed in the packing of the sampling tube 300, and the sampling tube 300 is removed for sampling. By analyzing the specific components and characteristics of Volatile Organic Compounds (VOC) and other micro-particles in the exhaled air, whether early biological characteristics of common diseases exist or not is judged, so that the diseases are prevented and treated early.

In one embodiment of the present invention, sampling tube 300 is removably insertable into housing 200 and is in communication with delivery tube 600 through housing 200.

Further, in one embodiment of the present invention, a plurality of sampling tubes 300 are provided, and a plurality of sampling tubes 300 are inserted side by side in the housing 200 and communicate with the delivery tube 600 through the housing 200.

For example, as shown in FIG. 1, the mask 100 is coupled to the housing 200 and is in communication with the housing 200. A gas supply line 400 passes through the housing 200 and communicates with the mask 100, and a gas source is disposed outside the housing 200 and is connected to the gas supply line 400 to supply oxygen into the mask 100. Diaphragm pump 500 and delivery pipe 600 are all placed inside housing 200, and one end of delivery pipe 600 is connected with diaphragm pump 500, and the other end is connected with sampling pipe 300. Sampling tubes 300 are provided in two, two sampling tubes 300 are inserted in housing 200 side by side, and each sampling tube 300 passes through housing 200 and is communicated with delivery pipe 600.

It should be noted here that the present invention is not limited in any way as to the manner of mounting between sampling tube 300 and housing 200. Any means for removably mounting sampling tube 300 to housing 200 is within the scope of the present invention. That is, the mounting between sampling tube 300 and housing 200 includes, but is not limited to, insertion.

As can be appreciated from the above-described embodiments, the cartridge connection between sampling tube 300 and housing 200 facilitates the removal of sampling tube 300 by a clinician for sampling purposes to analyze exhaled breath for Volatile Organic Compounds (VOCs) and other small particles. Meanwhile, a plurality of sampling pipes 300 are inserted on the shell 200, so that the sampling comprehensiveness and accuracy of the exhaled gas can be improved.

In one embodiment of the present invention, sampling tube 300 is made of a stainless steel material.

Through using stainless steel sampling pipe, can effectively avoid sampling pipe 300 itself to cause the pollution to human expired gas composition.

In one embodiment of the present invention, the gas sampler further comprises a one-way valve 700, the one-way valve 700 being mounted on the housing 200 to vent excess exhaled gas to the external environment.

Specifically, the mask 100 is connected to the housing 200 and communicates with the housing 200. A gas supply line 400 passes through the housing 200 and communicates with the mask 100, and a gas source is disposed outside the housing 200 and is connected to the gas supply line 400 to supply oxygen into the mask 100. Diaphragm pump 500 and delivery pipe 600 are all placed inside housing 200, and one end of delivery pipe 600 is connected with diaphragm pump 500, and the other end is connected with sampling pipe 300. Sampling tubes 300 are provided in two, two sampling tubes 300 are inserted in housing 200 side by side, and each sampling tube 300 passes through housing 200 and is communicated with delivery pipe 600. A one-way valve 700 is provided on the housing 200 to vent excess exhaled gas to the external environment.

During a particular sampling operation, the patient wears the mask 100 on his or her face by carrying a portable oxygen cylinder on his or her back, which provides oxygen to the patient via the gas supply line 400. The patient's exhaled gases flow downstream into the housing 200. Gas exhaled by the patient is drawn into sample tube 300 by delivery tube 600 under the action of diaphragm pump 500. When the patient exhales more gas, the pressure within the housing 200 increases, the one-way valve 700 opens, and a portion of the exhaled gas is expelled by the one-way valve 700 to the external environment. Volatile Organic Compounds (VOCs) and other fine particles in the exhaled breath drawn into sampling tube 300 by diaphragm pump 500 are adsorbed within the packing of sampling tube 300, and sampling tube 300 is removed for sampling. By analyzing the specific components and characteristics of Volatile Organic Compounds (VOC) and other micro-particles in the exhaled air, whether early biological characteristics of common diseases exist or not is judged, so that the diseases are prevented and treated early.

According to the above-described embodiments, the one-way valve 700 is only in the completely closed state for the external environment, and external air does not enter the sampler to pollute the exhaled air of the patient. The check valve 700 may be in both an open and closed state for the internal environment of the sampler. When the pressure in the shell 200 is small, the one-way valve 700 is closed, and all the gas exhaled by the patient is sucked into the sampling tube 300 by the diaphragm pump 500; when the pressure in housing 200 is greater, one-way valve 700 opens, a portion of the patient's expired gases is drawn into sampling tube 300 by diaphragm pump 500, and excess expired gases are vented to the outside environment through one-way valve 700.

In one embodiment of the invention, a carbon dioxide concentration sensor is mounted inside the mask 100.

For example, the mask 100 is connected to the housing 200 and communicates with the housing 200. A carbon dioxide concentration sensor is mounted on the upper surface of the interior of the mask 100. A gas supply line 400 passes through the housing 200 and communicates with the mask 100, and a gas source is disposed outside the housing 200 and is connected to the gas supply line 400 to supply oxygen into the mask 100. Diaphragm pump 500 and delivery pipe 600 are all placed inside housing 200, and one end of delivery pipe 600 is connected with diaphragm pump 500, and the other end is connected with sampling pipe 300. Sampling tubes 300 are provided in two, two sampling tubes 300 are inserted in housing 200 side by side, and each sampling tube 300 passes through housing 200 and is communicated with delivery pipe 600. A one-way valve 700 is provided on the housing 200 to vent excess exhaled gas to the external environment.

In use, the patient wears the mask 100 on his or her face with the patient carrying a portable oxygen cylinder, which provides oxygen to the patient via the gas supply line 400. The carbon dioxide concentration sensor monitors the carbon dioxide concentration within the mask 100 in real time. When the concentration of carbon dioxide in the mask 100 is below a predetermined standard level, indicating that the oxygen in the mask 100 is sufficient to meet the breathing requirements of the patient, the gas supply is turned off. When the concentration of carbon dioxide in the mask 100 exceeds a set standard value, it indicates that the concentration of oxygen in the mask 100 is low and cannot meet the breathing requirement of the patient, and at this time, the gas source needs to be opened to supply oxygen for the patient to breathe.

The patient's exhaled gases flow downstream into the housing 200. Gas exhaled by the patient is drawn into sample tube 300 by delivery tube 600 under the action of diaphragm pump 500. When the patient exhales more gas, the pressure within the housing 200 increases, the one-way valve 700 opens, and a portion of the exhaled gas is expelled by the one-way valve 700 to the external environment. Volatile Organic Compounds (VOCs) and other fine particles in the exhaled breath drawn into sampling tube 300 by diaphragm pump 500 are adsorbed within the packing of sampling tube 300, and sampling tube 300 is removed for sampling. By analyzing the specific components and characteristics of Volatile Organic Compounds (VOC) and other micro-particles in the exhaled air, whether early biological characteristics of common diseases exist or not is judged, so that the diseases are prevented and treated early.

In one embodiment of the present invention, the gas sampler includes a head band for securing the gas sampler to the face of a human body, the head band being mounted on the face mask 100 and being capable of being adjusted in tension.

For example, the mask 100 is connected to the housing 200 and communicates with the housing 200. A carbon dioxide concentration sensor is mounted on the upper surface of the interior of the mask 100. An elastic head band is uniformly arranged at the middle position of the left end and the right end of the face mask 100, an air supply pipeline 400 passes through the shell 200 and is communicated with the face mask 100, and an air source is arranged outside the shell 200 and is connected with the air supply pipeline 400 so as to supply oxygen into the face mask 100. Diaphragm pump 500 and delivery pipe 600 are all placed inside housing 200, and one end of delivery pipe 600 is connected with diaphragm pump 500, and the other end is connected with sampling pipe 300. Sampling tubes 300 are provided in two, two sampling tubes 300 are inserted in housing 200 side by side, and each sampling tube 300 passes through housing 200 and is communicated with delivery pipe 600. A one-way valve 700 is provided on the housing 200 to vent excess exhaled gas to the external environment.

In use, the patient carries the portable oxygen cylinder on his back and the elastic straps at the ends of the mask 100 are tied to secure the mask 100 to the patient's face. The portable oxygen cylinder provides oxygen to the patient through the gas supply line 400. The carbon dioxide concentration sensor monitors the carbon dioxide concentration within the mask 100 in real time. When the concentration of carbon dioxide in the mask 100 is below a predetermined standard level, indicating that the oxygen in the mask 100 is sufficient to meet the breathing requirements of the patient, the gas supply is turned off. When the concentration of carbon dioxide in the mask 100 exceeds a set standard value, it indicates that the concentration of oxygen in the mask 100 is low and cannot meet the breathing requirement of the patient, and at this time, the gas source needs to be opened to supply oxygen for the patient to breathe.

The tightness of the contact between the mask 100 and the face of the human body is adjusted by adjusting the tightness of the knot of the two elastic head bands. Can promote patient's comfort level under the prerequisite of guaranteeing that expired gas does not leak. Meanwhile, the mask can adapt to patients with different face sizes.

For another example, a clip capable of adjusting the distance is mounted on the ends of both elastic head bands.

Specifically, the portable oxygen cylinder is carried by the patient, and the end parts of the elastic head bands at the two ends of the mask 100 are mutually matched and locked by the buckles, so that the mask 100 is fixed on the face of the patient. The portable oxygen cylinder provides oxygen to the patient through the gas supply line 400. The carbon dioxide concentration sensor monitors the carbon dioxide concentration within the mask 100 in real time. When the concentration of carbon dioxide in the mask 100 is below a predetermined standard level, indicating that the oxygen in the mask 100 is sufficient to meet the breathing requirements of the patient, the gas supply is turned off. When the concentration of carbon dioxide in the mask 100 exceeds a set standard value, it indicates that the concentration of oxygen in the mask 100 is low and cannot meet the breathing requirement of the patient, and at this time, the gas source needs to be opened to supply oxygen for the patient to breathe.

The tightness of the face mask 100 contacting the human face is adjusted by adjusting the fastening distance of the ends of the two elastic head bands. Can promote patient's comfort level under the prerequisite of guaranteeing that expired gas does not leak. Meanwhile, the mask can adapt to patients with different face sizes.

For example, elastic head bands are provided at both left and right ends and an upper end of the mask 100, and the three elastic head bands are connected to each other such that the whole elastic head band can be fitted on the head of a human body.

When in use, the patient carries the portable oxygen cylinder and the elastic head band is integrally sleeved on the head of the patient, so that the mask 100 is fixed on the face of the patient. The portable oxygen cylinder provides oxygen to the patient through the gas supply line 400. The carbon dioxide concentration sensor monitors the carbon dioxide concentration within the mask 100 in real time. When the concentration of carbon dioxide in the mask 100 is below a predetermined standard level, indicating that the oxygen in the mask 100 is sufficient to meet the breathing requirements of the patient, the gas supply is turned off. When the concentration of carbon dioxide in the mask 100 exceeds a set standard value, it indicates that the concentration of oxygen in the mask 100 is low and cannot meet the breathing requirement of the patient, and at this time, the gas source needs to be opened to supply oxygen for the patient to breathe.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A gas sampler, comprising: a mask, a shell, a sampling pipe, a gas supply unit and a pumping unit,

2. The gas sampler of claim 1, wherein the gas supply unit comprises a gas supply line communicating with the mask through the housing and a gas source disposed outside the housing and connected to the gas supply line to supply oxygen into the mask.

3. The gas sampler of claim 1, wherein the pumping unit comprises a diaphragm pump and a delivery tube, the diaphragm pump and the delivery tube both being disposed within the housing, the delivery tube having one end connected to the diaphragm pump and another end connected to the sampling tube.

4. The gas sampler of claim 3, wherein the sampling tube is removably insertable into the housing and is in communication with the delivery tube through the housing.

5. The gas sampler of claim 4, wherein the plurality of sampling tubes are arranged in a side-by-side relationship and are mounted on the housing and extend through the housing to communicate with the delivery tube.

6. The gas sampler of claim 1, further comprising a one-way valve mounted on the housing to vent excess exhaled gas to the external environment and prevent external gas from entering the mask.

7. The gas sampler of any one of claims 1 to 6, wherein the face mask has a carbon dioxide concentration sensor mounted therein.

8. The gas sampler of claim 1, comprising a head strap for securing the gas sampler to a human face, the head strap being attached to the mask and being adjustable in tension.

9. The gas sampler of claim 1, wherein the face mask is shaped to conform to the shape of a human face, and is made of a silicone material.

10. The gas sampler of claim 1, wherein the sampling tube is made of a stainless steel material.