CN116773514A - Carbon dioxide detection device and protective facial mask - Google Patents
Carbon dioxide detection device and protective facial mask Download PDFInfo
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- CN116773514A CN116773514A CN202311025035.6A CN202311025035A CN116773514A CN 116773514 A CN116773514 A CN 116773514A CN 202311025035 A CN202311025035 A CN 202311025035A CN 116773514 A CN116773514 A CN 116773514A
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- carbon dioxide
- detection device
- dioxide detection
- photosensitive element
- light source
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/783—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour for analysing gases
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D27/00—Details of garments or of their making
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/02—Masks
- A62B18/025—Halfmasks
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B23/00—Filters for breathing-protection purposes
- A62B23/02—Filters for breathing-protection purposes for respirators
- A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/06—Mouthpieces; Nose-clips
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Chemical & Material Sciences (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Textile Engineering (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Pulmonology (AREA)
- Physical Education & Sports Medicine (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Zoology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The application discloses a carbon dioxide detection device and a protective mask. The carbon dioxide detection device mainly comprises a light source, a carbon dioxide detection sensor, a photosensitive element, a circuit board, a battery and a shell; when the breathed and inhaled carbon dioxide flows through the carbon dioxide detection sensor through the gas circuit, the carbon dioxide detection sensor can change in color, the photosensitive element converts the color signal into an electric signal, and the sensing data are transmitted to terminal equipment for data analysis and result display. The protective mask comprises a mask main body, an elastic hanging belt and a carbon dioxide detection device, is an intelligent protective mask with low cost, small structure and convenient use, has a better protective effect, and has the function of monitoring the waveform of end-tidal carbon dioxide in real time, so that a patient can conveniently perform self-health management.
Description
Technical Field
The present application relates to end tidal carbon dioxide (ETCO) 2 ) Detection especially relates to a carbon dioxide detection device and protective mask, belongs to daily protection and health monitoring technical field.
Background
Currently, the partial pressure of carbon dioxide at the end of human expiration (PETCO) 2 ) Or concentration (ETCO) 2 ) As one of the important vital signs, ETCO has been considered as the sixth basic vital sign other than body temperature, respiration, pulse, blood pressure, arterial oxygen saturation 2 The real-time monitoring has important physiological significance and clinical application value.
The end-tidal carbon dioxide waveform graph can be obtained by plotting the end-tidal carbon dioxide concentration as a function of time, and can reflect a number of physiological characteristics, and can be used for evaluating systemic metabolism, cardiac output, lung perfusion and ventilation under various clinical conditions. In addition, the end-tidal carbon dioxide waveform has important application in rapidly identifying the apneas and the airway lesions, has main guiding significance for daily monitoring of patients with chronic obstructive pulmonary diseases and metabolic acidosis, and has better functions than a pulse oximeter.
Currently, two main monitoring methods for end-tidal carbon dioxide are mass spectrometry and infrared absorption. Mass spectrometers are powerful but are not practical due to their high cost and bulk. Therefore, infrared analyzers are the most commonly used means of clinically measuring carbon dioxide in respiratory gases. The method for monitoring the end-tidal carbon dioxide is commonly used clinically, namely an end-tidal carbon dioxide monitoring module is embedded into a monitor for measurement, and the factors such as large volume and high power consumption limit some applications of the end-tidal carbon dioxide monitoring module. Hand-held end-tidal capnometers have been developed that increase ease of use, but are also limited to short-time temporary monitoring. This is because the infrared gas measurement module composed of the sensor, the infrared light source and the gas adapter still has the problems of large volume and the like, is inconvenient to use in the hand, and is suitable for temporary measurement.
The protective mask commonly used at present can be used for nose and mouth breathing occasions, is not influenced by human body movement and environmental noise, is convenient to use, and does not have a detection function. Therefore, the protective mask can be intelligently modified, and the mask is combined with the end-tidal carbon dioxide detection technology, so that chronic patients such as chronic obstructive pulmonary disease patients can realize daily protection and simultaneously carry out disease condition monitoring and health management.
Disclosure of Invention
The application aims at overcoming the defects of the prior art, and provides a carbon dioxide detection device and a protective mask, which can be applied to end-tidal carbon dioxide spectrum detection and overcome the defects of inconvenient use and equipment design of the existing detector.
In order to achieve the above purpose, the application is realized by adopting the following technical scheme:
a carbon dioxide detection device comprising: the shell is arranged in the shell and comprises a light source, a carbon dioxide sensor, a photosensitive element, a circuit board and a battery; wherein the photosensitive element is used for detecting transmitted or reflected light generated by the light source after the carbon dioxide sensor is irradiated by the light source; the circuit board is used for controlling the light source and the photosensitive element to work, converting the electric signal detected by the photosensitive element into a digital signal and transmitting the digital signal to the terminal equipment; the battery is connected with the light source, the photosensitive element and the circuit board and is used for supplying power; the carbon dioxide sensor consists of a hydrophobic porous material, a pH indicator attached to the hydrophobic porous material, an alkaline substance and amino acid; the carbon dioxide sensor is exposed to CO 2 In the case of (2) color is caused to follow CO 2 Is changed in a rapid and reversible manner.
Further, the mass ratio of the pH indicator to the alkaline substance to the amino acid is: 1 to 10: 150-400: 1 to 20.
Further, the pH indicator is one or more of thymol blue, m-cresol purple, cresol red and phenol red.
Further, the alkaline substance is one or more of trimethyl ethyl ammonium hydroxide, tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide, tetrabutyl ammonium hydroxide and hexadecyl trimethyl ammonium hydroxide.
Further, the amino acid is one or more of glycine, alanine, valine, leucine, isoleucine, proline, tryptophan, serine, tyrosine, cysteine, threonine, aspartic acid, glutamic acid, lysine, arginine and histidine.
Further, the hydrophobic porous material may be a hydrophobic porous membrane (PTFE and PE), a hydrophobic nanoparticle (SiO 2 、Al 2 O 3 And TiO 2 ) Or both.
Further, the circuit board comprises an ADC module, a control module and a wireless communication module; the ADC module converts an electric signal obtained by detecting the photosensitive element into a digital signal; the wireless communication module establishes wireless communication connection with the terminal equipment to realize wireless data receiving and transmitting; the control module drives the light source, the photosensitive element, the ADC module and the wireless communication module to work normally.
Preferably, the carbon dioxide detection sensor is not responsive or has low response to humidity, and the carbon dioxide detection sensor is completely reversible in detecting carbon dioxide;
preferably, the response time of the carbon dioxide detection sensor to carbon dioxide is less than 200ms;
further, the light source is blue light, green light, red light or white light.
Further, the photosensitive element may be one of a CCD camera, a CMOS camera, a photodiode, or a phototransistor;
further, a part of the light emitted by the light source is absorbed and reflected by the carbon dioxide detection sensor, and a part of the light is transmitted through the sensitive material, so that the light source and the photosensitive element can be arranged on two sides or the same side of the carbon dioxide detection sensor, and an electric signal can be acquired by receiving the transmitted or reflected light generated after the light source irradiates the carbon dioxide detection sensor.
Further, the battery is preferably a small rechargeable button cell.
Further, the wireless communication module is one of Bluetooth, wi-Fi and infrared. The terminal device may indicate whether the connection was successful.
A protective mask comprising a mask body, an elastic hanging belt and the carbon dioxide detection device; the carbon dioxide detection device is embedded in the mask body and can be unloaded and reused; the elastic hanging belts are fixed on two sides of the mask body.
Preferably, the mask body can customize a filter layer containing an activated carbon material according to environmental requirements for filtering air, reducing harm of toxic and harmful gas to a user, protecting a respiratory system and reducing influence on a carbon dioxide detection device.
Preferably, the elastic hanging belt is used for fixing the mask body of the protective mask onto the mouth and nose so as to form a closed cavity between the mask body and the mouth and nose of a user.
Preferably, the carbon dioxide detecting device is embedded in the mask body, and a part of the breathing/inhaling air flow can pass through the carbon dioxide detecting device and is provided with a filter disc for filtering the air.
Preferably, the carbon dioxide detection device is removable from the protective mask and reusable.
The method for monitoring the waveform of the end-tidal carbon dioxide in real time by the protective mask comprises the following steps: the patient wears the protective mask, so that the protective mask is required to be tightly attached to the user, and the protective effect of the mask is ensured; and establishes wireless connection between the protective mask and the terminal equipment; when carbon dioxide in the breathing/inhaling air flows through the carbon dioxide detection sensor through the air passage, the color of the sensitive material is obviously changed, the color signal is converted into an electric signal by the photosensitive element and is transmitted to the terminal equipment in real time through the wireless communication module for data analysis and result display, and if abnormal real-time alarm occurs.
The application provides a carbon dioxide detection device and a protective mask, which can be applied to monitoring the waveform of end-tidal carbon dioxide in real time, wherein the carbon dioxide detection device does not need to additionally add a conduit, a drying pipe and the like, all functional units are integrated on a circuit board, and measurement data of the end-tidal carbon dioxide are sent to terminal equipment through a wireless communication module for analysis and result display; the whole detection device is small in size and easy to integrate with the protective mask, so that the protective mask with the monitoring function is formed. The protective mask with the monitoring function is small in size, compact in structure, convenient to carry and use, can be used for long-time testing at any time and any place without interference, can comprehensively measure the pulmonary function and the respiration related data, obtains comprehensive and accurate analysis data, is favorable for self-health management of chronic patients, and provides important guidance for early screening or daily condition monitoring of chronic patients.
Drawings
For a clearer description of the technical solutions of the present application, the following briefly describes the drawings that are needed in the embodiments, it being understood that the following drawings illustrate only some embodiments of the application and therefore should not be considered limiting of the scope, in which:
FIG. 1 is a schematic diagram of a carbon dioxide detecting device according to the present application;
FIG. 2 is a functional schematic of a circuit board of the carbon dioxide detection device of the present application;
fig. 3 is a schematic structural view of a protective mask according to the present application;
FIG. 4 is a graph showing response data of the carbon dioxide detecting device of the present application to humidity;
FIG. 5 is a graph showing response data of the carbon dioxide detecting device of the present application to carbon dioxide;
FIG. 6 is a linear fit of the carbon dioxide detection device of the present application to carbon dioxide in the 0.00006-0.5% concentration range;
FIG. 7 is a linear fit of the carbon dioxide detection device of the present application to carbon dioxide in the 0.5-6% concentration range;
FIG. 8 is a schematic diagram of response time of a carbon dioxide detection device of the present application;
FIG. 9 is a flowchart of a method for monitoring end-tidal carbon dioxide waveform in real time using a carbon dioxide detection device and a protective mask according to the present application;
FIG. 10 is a waveform diagram of end-tidal carbon dioxide for a normal person for 6 respiratory and inhalation cycles, showing the results of actual detection of a carbon dioxide detection device and protective mask according to the present application;
the reference numerals in the drawings are as follows:
101-a mask body; 102-an elastic hanging belt; 103-a carbon dioxide detection device; 201-a light source; 202-a carbon dioxide detection sensor; 203-a photosensitive element; 204-a circuit board; 205-battery; 206-a housing; 207-a filter; a 301-ADC module; 302-a control module; 303-wireless communication module.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
The application provides a carbon dioxide detection device, wherein the carbon dioxide detection device 103 is a miniature device based on colorimetric sensing reagent development, and mainly comprises a light source 201, a carbon dioxide detection sensor 202, a photosensitive element 203, a circuit board 204, a battery 205 and a shell 206 as shown in fig. 1.
Wherein, the shell 206 is provided with a through hole for allowing the gas to be detected to enter, and preferably, the through hole is provided with a filter 207, and the filter 207 has the function of filtering pollutants in the air; the spatial relationship among the light source 201, the photosensitive element 203, and the carbon dioxide detection sensor 202 in the carbon dioxide detection device 103 is: the light source 201, the carbon dioxide detection sensor 202 and the photosensitive element 203 are arranged in parallel, so that the photosensitive element 203 can detect that the light source 201 irradiates the carbon dioxide sensor 202 to generate transmission or reflection light; when the light source 201 and the photosensitive element 203 are on both sides of the carbon dioxide detection sensor 202, the photosensitive element 203 detects light transmitted through the carbon dioxide detection sensor 202; when the light source 201 and the photosensitive element 203 are on the same side of the carbon dioxide detection sensor 202, the photosensitive element 203 detects light reflected from the surface of the carbon dioxide detection sensor 202, and fig. 1 shows the first case.
The light source 201 may be blue light, green light, red light or white light, and in this embodiment, a white LED is preferable as the light source 201.
The photosensitive element 203 may be a CCD camera, a CMOS camera, a photodiode, or a phototransistor, and in this embodiment, a photodiode is preferable as the photosensitive element 203.
The circuit board 204 is used for controlling the light source 201 and the photosensitive element 203 to work, converting the electric signal detected by the photosensitive element 203 into a digital signal and transmitting the digital signal to the terminal equipment; the battery 205 is connected with the light source 201, the photosensitive element 203 and the circuit board 204 for supplying power; fig. 2 is a schematic diagram of a circuit board structure of the present application, where the circuit board 204 includes an ADC module 301, a control module 302, and a wireless communication module 303; wherein, the ADC module 301 converts the electrical signal detected by the photosensitive element 203 into a digital signal; the wireless communication module 303 establishes wireless communication connection with terminal equipment to realize wireless data receiving and sending; the control module 302 drives the light source 201, the photosensitive element 203, the ADC module 301 and the wireless communication module 303 to operate normally.
The wireless communication module 303 is one of bluetooth, wi-Fi and infrared. In this embodiment, bluetooth is preferred as a wireless communication method, so that connection with terminal devices, such as mobile phones, is easy to be established.
The carbon dioxide sensor 202 is exposed to CO 2 In the case of (2) color is caused to follow CO 2 Is changed in a rapid and reversible manner.
In the present application, the carbon dioxide detecting sensor 202 is composed of a pH indicator, a basic substance, and an amino acid attached to a hydrophobic porous material, and the sensing performance of the carbon dioxide detecting sensor 202 of the present application depends on a combination of a plurality of components. The main component is a chemical dye with reversible response pH value, in particular carbon dioxide can change the pH value of a sensing environment, so as to change the protonation state of the dye, and further change the color (such as metacresol purple which turns purple when the pH value is more than 9.0 and turns yellow when the pH value is less than 7.4), thereby providing the color which is along with CO 2 The concentration changes and the color changes. In addition, the alkaline substance is used as a phase transfer catalyst and weak base, so that the pH value of the reaction system can be increased enough to realize optimal CO 2 Detecting that the alkaline substance reacts with the carbon dioxide in the gas phase and brings the alkaline substance into the solid phase of the sensor) The reaction is reversible. Further, the amino acid has an amphoteric group, the amine group of which can be oxidized withCarbon undergoes a carbamate reaction (e.g., a reaction between glycine and carbon dioxide:. A. Sup..sup.>) The reaction is quick, reversible and high in yield, and can quickly lock carbon dioxide molecules in the gas phase, so that the response time is shortened. The hydrophobic porous material which does not participate in the reaction is used as a substrate, so that the contact area of the sensing material and the gas can be increased, the reaction time can be shortened, and the resistance of the sensing material system to high humidity in exhaled breath can be increased, so that the carbon dioxide detection sensor 202 is completely reversible to carbon dioxide detection, but does not respond or responds poorly to humidity.
Wherein, the mass ratio of the pH indicator to the alkaline substance to the amino acid is determined according to the actual reaction condition of the specific substances, and is preferably: 1 to 10: 150-400: 1 to 20.
The pH indicator is one or more of thymol blue, m-cresol purple, cresol red and phenol red. M-cresol purple is preferred in this example.
The alkaline substance is one or more of trimethyl ethyl ammonium hydroxide, tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide, tetrabutyl ammonium hydroxide and hexadecyl trimethyl ammonium hydroxide. Cetyl trimethylammonium hydroxide is preferred in this embodiment.
The amino acid is one or more of glycine, alanine, valine, leucine, isoleucine, proline, tryptophan, serine, tyrosine, cysteine, threonine, aspartic acid, glutamic acid, lysine, arginine and histidine. Glycine is preferred in this embodiment.
The hydrophobic porous material is a hydrophobic porous membrane (PTFE or PE), hydrophobic nano particles (SiO 2 、Al 2 O 3 Or TiO 2 ) Or both. Preferred in this embodiment are hydrophobic PTFE porous membrane and SiO 2 And (3) mixing and multiplexing the nano particles.
The capnography sensor 202 of the present application generally achieves attachment of the pH indicator, alkaline substance, and amino acid by immersing the hydrophobic porous material in a solution of the pH indicator, alkaline substance, and amino acid and removing the solvent.
The following components are added with hexadecyl trimethyl ammonium hydroxide, glycine, metacresol purple and SiO 2 The detection effect of the carbon dioxide detection sensor 202 will be further described by taking a nanoparticle and a PTFE porous membrane as examples.
In this example, based on cetyltrimethylammonium hydroxide, glycine, meta-cresol purple, siO 2 The specific preparation process of the carbon dioxide detection sensor 202 of the nanoparticle and PTFE porous membrane is as follows:
1) 8mg of silicon dioxide nano particles (< 100 nm) are weighed and dispersed in 4mL of ethanol solution, and ultrasonic oscillation is carried out for 30 min to obtain solution A; then cutting a PTFE porous membrane with the size of 1 square centimeter, putting the PTFE porous membrane into the mixed solution A, and continuing ultrasonic oscillation for 5 min; and taking out the PTFE porous membrane containing the nano silicon dioxide particles, and drying in a vacuum drying oven for later use.
2) 5mg of metacresol purple and 30mg of glycine are weighed and dissolved in 4mL of mixed solution of ethanol and water (volume ratio is 3:1), so as to obtain solution B; 1mL of cetyltrimethylammonium hydroxide (25 wt% aqueous solution) is removed by a pipette and transferred into the mixed solution B, and the mixed solution B is stirred and mixed uniformly to obtain a solution C; immersing the PTFE porous membrane containing nano silicon dioxide prepared in the step 1 into the solution C, standing for 12 hours, taking out, and drying in a vacuum drying oven to obtain the carbon dioxide detection sensor 202. And weighing the same amount of m-cresol purple and glycine, uniformly mixing and drying the mixture, and obtaining the carbon dioxide sensor without the hydrophobic porous material.
Fixing the prepared carbon dioxide detection sensor 202 on the surface of a photodiode, wherein light emitted by a white light LED is directly irradiated onto the surface of the carbon dioxide detection sensor 202, and part of the light is absorbed and reflected by the carbon dioxide detection sensor 202 and part of the light is sensed by the photodiode through the carbon dioxide detection sensor 202; as the carbon dioxide flows across the surface of the carbon dioxide detection sensor 202, the color of the carbon dioxide detection sensor 202 changes from blue to yellow, and a significant color change causes a change in the photo-generated current of the photodiode 203.
The ADC module 301 on the circuit board 204 converts the analog signal into a digital signal, and sends the sensing data to the mobile phone APP via bluetooth 303 in real time for data analysis and result display.
To verify the response of the carbon dioxide detection device 103 to humidity, air of different humidity was introduced into the prepared carbon dioxide detection device 103, as shown in FIG. 4, using a loaded hydrophobic SiO as compared to a carbon dioxide sensor without a hydrophobic porous material 2 The carbon dioxide detecting means 103 of the PTFE porous membrane of nanoparticles hardly responds or has a weak response to humidity, and can be used for accurately detecting the concentration of carbon dioxide gas in exhaled breath of a human body having high humidity.
The prepared carbon dioxide detection device 103 was calibrated for sensing performance, and carbon dioxide with different concentrations (the concentrations of the carbon dioxide gas were calibrated in advance by using standard instrument tests, and the concentrations were respectively 0.00006%, 0.0013%, 0.025%, 0.063%, 0.0963%, 0.186%, 0.462%, 1.5275%, 2.214%, 3.3%, 4.1225%, 4.85%, and 5.41%), and response data of the carbon dioxide detection device to carbon dioxide gas with different concentrations were tested. As shown in FIG. 5, the carbon dioxide detecting device can actually detect 0.00006% (0.6 ppm) of carbon dioxide gas at the minimum, and the detection limit is far lower than the concentration of carbon dioxide in the air (about 0.04%). And when the concentration of carbon dioxide is in the range of 0.00006 to 0.5%, the signal intensity is linearly related to the concentration of carbon dioxide (R 2 =0.986) (fig. 6); when the concentration of carbon dioxide is in the range of 0.5-6%, the signal intensity and the concentration of carbon dioxide still have good linear response (R 2 =0.990) (fig. 7).
To meet the detection requirements of end-tidal carbon dioxide under various conditions, the response time of the carbon dioxide sensor needs to be less than 200 ms. As shown in FIG. 8, the response time of the prepared carbon dioxide detection device was far lower than 200ms (T 90 =55 ms), the detection requirement of the end-tidal carbon dioxide spectrum under various conditions can be met.
The carbon dioxide detection device has small volume and high sensitivityAnd respond quickly, its color follows the CO 2 Is changed in a rapid and reversible manner, and can be used for monitoring the end-tidal carbon dioxide waveform in real time. The application also provides a protective mask, as shown in fig. 3, which mainly comprises a mask main body 101, an elastic hanging belt 102 and a carbon dioxide detection device 103, wherein the carbon dioxide detection device 103 is embedded in the mask main body 101 and can be detached and reused. The mask body 101 has a function of filtering contaminants in the air; the elastic hanging belt 102 is two elastic ropes, and can be elastically fixed at two ears or at the head, so that the mask main body 101 is attached to the face and the mask main body 101 of the protective mask is fixed on the mouth and the nose, and a closed cavity is formed between the mask main body 101 and the mouth and the nose of a user; the carbon dioxide detection sensor is used for recording the concentration of carbon dioxide in the gas passing through the carbon dioxide detection device; the user wears the protective mask and breathes normally, partial airflow of breathing/breathing is through carbon dioxide detection device, and carbon dioxide detection device can detect the concentration of carbon dioxide in breathing, breathing in real time, can draw end-expiration carbon dioxide map through wireless transmission to terminal equipment. Wherein, as long as the detection range of the sensor is within, air is used as a base line.
The application discloses a method for monitoring a waveform of end-tidal carbon dioxide in real time based on a protective mask, which comprises the following steps:
1) The protective mask is worn, the protective mask is required to be tightly attached to a user, and the protective effect of the mask is ensured;
2) Establishing wireless connection between the carbon dioxide detection device 103 in the protective mask and the terminal equipment;
3) Acquiring the concentration of carbon dioxide; as shown in fig. 9, air enters the mouth and nose of the user through the carbon dioxide detection device 103 and the filter layer of the mask body 101 to protect the respiratory system of the user and filter toxic and harmful gases, and reduce the influence on the carbon dioxide detection device 103; the exhaled air passes through the filter layer of the mask body 101 and the carbon dioxide detection device 103, and the carbon dioxide detection device 103 responds to carbon dioxide in the exhaled and inhaled air in real time and transmits data to the terminal equipment.
4) The terminal equipment acquires data, calculates the current carbon dioxide concentration according to a relation curve of the signal intensity change corresponding to the color change and the carbon dioxide concentration, and synchronously displays a waveform diagram of the end-tidal carbon dioxide of the user, as shown in fig. 10, which is an exemplary waveform diagram of the end-tidal carbon dioxide (comprising 6 breathing and inhaling cycles), and can give an alarm in real time if abnormality occurs.
The application can detect the relation between the end-tidal carbon dioxide concentration and time of the user in real time, and has the advantages of small volume, convenient carrying, convenient use and the like.
The foregoing has shown and described the basic principles, principal features and advantages of the application. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the application in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the application.
Claims (11)
1. A carbon dioxide detection device, comprising: a housing, a light source, a carbon dioxide sensor, a photosensor, a circuit board and a battery disposed within the housing; wherein the photosensitive element is used for detecting transmitted or reflected light generated by the light source after the carbon dioxide sensor is irradiated by the light source; the circuit board is used for controlling the light source and the photosensitive element to work, converting the electric signal detected by the photosensitive element into a digital signal and transmitting the digital signal to the terminal equipment; the battery is connected with the light source, the photosensitive element and the circuit board and is used for supplying power; the carbon dioxide sensor consists of a pH indicator, a hydrophobic porous material, an alkaline substance and amino acid; the carbon dioxide sensor is exposed to CO 2 In the case of (2) color is caused to follow CO 2 Is changed in a rapid and reversible manner.
2. The carbon dioxide detection device according to claim 1, wherein the mass ratio of the pH indicator, the alkaline substance, and the amino acid is: 1 to 10: 150-400: 1 to 20.
3. The carbon dioxide detection device of claim 1, wherein the pH indicator is one or more of thymol blue, meta-cresol purple, cresol red and phenol red.
4. The carbon dioxide detection device of claim 1, wherein the hydrophobic porous material is a hydrophobic porous membrane or hydrophobic nanoparticles or both.
5. The carbon dioxide detection device according to claim 1, wherein the alkaline substance is one or more of trimethyl ethyl ammonium hydroxide, tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide, tetrabutyl ammonium hydroxide, cetyl trimethyl ammonium hydroxide.
6. The carbon dioxide detection device according to claim 1, wherein the amino acid is one or more of glycine, alanine, valine, leucine, isoleucine, proline, tryptophan, serine, tyrosine, cysteine, threonine, aspartic acid, glutamic acid, lysine, arginine, histidine.
7. The carbon dioxide detection device of claim 1, wherein the circuit board comprises an ADC module, a control module, a wireless communication module; the ADC module converts an electric signal obtained by detecting the photosensitive element into a digital signal; the wireless communication module establishes wireless communication connection with the terminal equipment to realize wireless data receiving and transmitting; the control module drives the light source, the photosensitive element, the ADC module and the wireless communication module to work normally.
8. The carbon dioxide detection device of claim 7, wherein the wireless communication module is one of bluetooth, wi-Fi, and infrared.
9. The carbon dioxide detection device of claim 7, wherein the light source is blue, green, red, or white light.
10. The carbon dioxide detection device of claim 7, wherein the photosensitive element is a CCD camera, a CMOS camera, a photodiode, or a phototransistor.
11. A protective mask comprising a mask body, an elastic strap, and the carbon dioxide detection device of any one of claims 7-10; the carbon dioxide detection device is embedded in the mask body and can be unloaded and reused; the elastic hanging belts are fixed on two sides of the mask body.
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