Device and method for synchronously monitoring multiple components of breathing gas of pressurized oxygen supply mask

Abstract

The invention discloses a pressurized oxygen supply mask breathing gas multi-component synchronous monitoring device and method.The device comprises a mask cavity inner unit, and the mask cavity inner unit comprises a photoelectric detection system; the photoelectric detection system comprises an O2 laser and an O2 detector which are used for O2 molecular spectrum detection, a CO2 and H2O laser and a CO2 and H2O detector which are used for simultaneously detecting CO2 and H2O molecular spectrums, a dichroic mirror I and a dichroic mirror II which are used for coupling and separating two paths of laser beams, and a temperature, pressure and relative humidity integrated sensor which is arranged in a breathing gas to-be-detected area; the mask cavity external unit comprises an electronics system, and the electronics system comprises a data acquisition module, a laser control module and a system control and data processing analysis module. The device has the advantages of short response time, intrinsic safety and high stability and reliability, the overall structure is more compact, and the device has high general practicability in practical application.

Description

Technical Field

[0001] The invention relates to the field of gas sensing technology and gas detection, and in particular to a device and method for synchronously monitoring multi-component breathing gas from a pressurized oxygen supply mask. Background Art

[0002] Oxygen masks are emergency life-saving devices that can transfer the oxygen needed for breathing from the oxygen supply system to the human lungs. They mainly include medical oxygen masks, passenger oxygen masks, and oxygen masks used by airline pilots. They play an important role in treating diseases and protecting the safety of passengers and pilots. The oxygen flow rate of the mask is generally 3-4L / min, but it is necessary to adjust the oxygen flow rate of the mask at any time in combination with the actual application environment and the oxygen saturation and vital signs monitoring data of the oxygen supply personnel to achieve the purpose of effective oxygen supply, especially for special groups such as patients with different types of diseases and pilots in aviation operating environments.

[0003] Oxygen is the main component of human breath. According to the detection principle of gas sensors, oxygen sensors can be mainly divided into: electrochemical sensors and optical sensors. Among electrochemical sensors, zirconium oxide sensors are a typical oxygen sensor. Its working principle is to use zirconium oxide as an electrolyte and electrochemically react with platinum electrodes at high temperatures to detect gas concentration analysis. However, it needs to operate in a high temperature environment (several hundred degrees Celsius), the response time is more than a few seconds, and it takes a long time to preheat. It is mostly used in industrial combustion treatment control and various oxygen production and supply systems. Optical oxygen sensors can be divided into oxygen sensors based on the principle of fluorescence quenching and oxygen sensors based on the principle of laser absorption spectroscopy according to the technical principle. Fluorescence quenching oxygen sensors are based on the relationship between the fluorescence intensity of fluorescent materials and oxygen concentration. They "indirectly" measure oxygen concentration by measuring the change in fluorescence intensity. They are mainly used in life sciences, industrial process control and other related fields. They are easily affected by environmental factors such as temperature, humidity, and light, and the time response is relatively long. It is difficult to meet the real-time monitoring needs of oxygen content in the mask environment. Laser spectroscopy oxygen sensors use the unique "fingerprint" spectral characteristics of each molecule to achieve accurate identification and quantitative analysis of gas molecules. They have high resolution, high sensitivity and rapid response characteristics, and have been successfully applied in atmospheric environment monitoring, industrial process control, biomedicine, deep sea and deep space exploration and other fields.

[0004] In view of the importance of real-time monitoring and feedback of blood oxygen saturation and vital signs data of oxygen supply personnel when using pressurized oxygen masks for special groups such as patients with different types of diseases in the medical field and pilots in aviation working environments. Traditional monitoring instruments are bulky, complicated to operate, and have poor portability. The monitoring data is single and there is a potential risk of false alarms. Summary of the invention

[0005] The purpose of the present invention is to provide a pressurized oxygen mask respiratory gas multi-component synchronous monitoring device and method, which has the advantages of fast response time, intrinsic safety, high stability and reliability, a more compact overall structure, miniaturization and intelligence, and has high universal practicability in practical applications.

[0006] In one aspect of the present invention, the present invention provides a device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask. According to an embodiment of the present invention, the device comprises:

[0007] The mask cavity internal unit includes a photoelectric detection system, the photoelectric detection system includes an O2 laser and an O2 detector for detecting the O2 molecular spectrum, a CO2 and H2O laser, a CO2 and H2O detector for simultaneously detecting the CO2 and H2O molecular spectra, a dichroic mirror 1 and a dichroic mirror 2 for coupling and separating the two laser beams, and an integrated sensor for temperature, pressure and relative humidity placed in the respiratory gas to be detected area;

[0008] The mask cavity outer unit includes an electronics system, which includes a data acquisition module, a laser control module, and a system control and data processing and analysis module. The data acquisition module is used to collect data collected by O2 detectors, CO2 and H2O detectors, and temperature, pressure and relative humidity integrated sensors. The laser control module is used to control the operation of O2 lasers, CO2 and H2O lasers. The system control and data processing and analysis module is used to process and control the operation and data of the data acquisition module and the laser control module.

[0009] In addition, the device for synchronously monitoring multi-component respiratory gas from a pressurized oxygen supply mask according to the above embodiment of the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the respiratory gas detection area is set in the human oral respiratory gas exhalation area inside the mask.

[0011] In some embodiments of the present invention, the incident angle of the O2 laser relative to the surface of the dichroic mirror one is 45°, the incident angle of the CO2 and H2O lasers relative to the surface of the dichroic mirror one is 45°, the angle between the incident laser beams emitted by the O2 laser and the CO2 and H2O lasers is 90°, the incident laser beams emitted by the O2 laser and the CO2 and H2O lasers are respectively incident from two sides of the dichroic mirror one and then coupled into a coaxial beam through the dichroic mirror one, the coaxial beam passes through the respiratory gas to be detected area, and then is separated into two outgoing laser beams by the dichroic mirror two, one of the outgoing laser beams is directly reflected by the dichroic mirror two and then received by the CO2 and H2O detectors, and the outgoing angle is 45°, and the other outgoing laser beam passes through the dichroic mirror two and then is received by the O2 detector, and the angle between the two outgoing laser beams is 90°.

[0012] In some embodiments of the present invention, the O2 laser emission wavelength is in the spectral range of 760-763nm, which is suitable for measuring the spectral window range of O2, and the CO2 and H2O laser emission wavelength range is in the spectral window range of 2600-2800nm, which is suitable for simultaneously measuring CO2 and H2O.

[0013] In some embodiments of the present invention, the O2 laser, CO2 laser and H2O laser are all TO5 packaged semiconductor lasers.

[0014] In some embodiments of the present invention, the O2 laser and the CO2 and H2O lasers are connected to a laser control module in the mask cavity external unit via shielded insulated cables, and the laser control module outputs a current signal in a specific range to drive the laser to emit laser within a certain wavelength range.

[0015] In another aspect of the present invention, the present invention proposes a method for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen supply mask. According to an embodiment of the present invention, the apparatus for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen supply mask is used for monitoring.

[0016] In addition, the method for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen supply mask according to the above embodiment of the present invention may also have the following additional technical features:

[0017] In some embodiments of the present invention, the following steps are included:

[0018] (1) The system control and data processing and analysis module generates a simulated laser drive signal, which is input into the laser control module for tuning the emission wavelengths of the O2 laser and the CO2 and H2O lasers;

[0019] (2) The two laser beams emitted by the O2 laser and the CO2 and H2O lasers are coupled into a coaxial beam through a dichroic mirror 1. The coaxial beam passes through the respiratory gas detection area and is then separated into two laser beams by a dichroic mirror 2.

[0020] (3) After the two laser beams are separated, they are received by the O2 detector and the CO2 and H2O detectors respectively, and the photoelectric signals are converted and then output to the data acquisition module in the unit outside the cavity;

[0021] (4) The data acquisition module converts the analog signals independently output by the O2 detector, CO2 and H2O detectors, and the signals output by the integrated temperature, pressure and relative humidity sensor into digital signals, and then sends them to the system control and data processing and analysis module through serial communication;

[0022] (5) The system control and data processing and analysis module combines the temperature, pressure and humidity data output by the temperature, pressure and relative humidity integrated sensor to perform real-time analysis and correction on the spectral signals collected by the O2 detector and the CO2 and H2O detectors;

[0023] (6) The system control and data processing and analysis module sends the final corrected O2, CO2, and H2O data to the designated data receiving terminal in real time for comprehensive evaluation and accurate analysis of the blood oxygen saturation and vital signs of the oxygen supply personnel.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention utilizes laser spectral sensing technology, combined with dichroic mirror beam coupling technology to realize the layout and integration of multi-component gas sensors in the microcavity of the mask, overcoming the problems of dead space acquisition and functional coupling; by taking into account the simultaneous monitoring of other key components (CO2 and H2O) in human respiratory gas, it provides real-time monitoring and feedback of blood oxygen saturation and vital signs of oxygen supply personnel, and realizes comprehensive, scientific and accurate oxygen supply assessment to improve important guarantees. Compared with traditional single oxygen sensors, the present invention has fast response time, intrinsic safety, high stability and reliability, more compact overall structure, and high general practicality in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 2 is a schematic diagram of a framework of a device for synchronously monitoring multi-component respiratory gas from a pressurized oxygen supply mask according to an embodiment of the present invention;

[0027] In the figure, 1. unit inside the mask cavity, 101. O2 laser, 102. O2 detector, 103. CO2 and H2O lasers, 104. CO2 and H2O detectors, 105. dichroic mirror one, 106. dichroic mirror two, 107. integrated sensor for temperature, pressure and relative humidity, 108. respiratory gas detection area, 2. unit outside the mask cavity, 201. data acquisition module, 202. laser control module, 203. system control and data processing and analysis module. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, the pressurized oxygen mask respiratory gas multi-component synchronous monitoring device includes a mask cavity inner unit 1 and a mask cavity outer unit 2.

[0031] The unit 1 in the mask cavity includes a photoelectric detection system, which includes an O2 laser 101 and an O2 detector 102 for detecting the O2 molecular spectrum, a CO2 and H2O laser 103 for simultaneously detecting the CO2 and H2O molecular spectra, a CO2 and H2O detector 104, a dichroic mirror 1 105 and a dichroic mirror 2 106 for coupling and separating two laser beams, and an integrated sensor 107 for temperature, pressure and relative humidity arranged in a respiratory gas detection area 108. The respiratory gas detection area 108 is arranged in the human oral respiratory gas exhalation area in the mask. The emission wavelength of the O2 laser 101 is 761nm or 763nm, and the emission wavelength of the CO2 and H2O lasers 103 is 2683nm. The O2 laser 101 and the CO2 and H2O lasers 103 all use TO5 packaged semiconductor lasers with a volume size of several cm 3 The O2 laser 101 and the CO2 and H2O lasers 103 are connected to the laser control module 202 in the mask cavity outer unit 2 through a shielded insulated cable. The laser control module 202 outputs a current signal in a specific range to drive the laser to emit laser within a certain wavelength range. The temperature, pressure and relative humidity integrated sensor 107 is a mm-sized micro sensor with an integrated high-speed digital processing chip. It can directly read the output pressure, temperature and relative humidity, and has a programmable interrupt control function and a waterproof design.

[0032] The mask cavity outer unit 2 includes an electronic system, which includes a data acquisition module 201, a laser control module 202, and a system control and data processing and analysis module 203. The data acquisition module 201 is used to collect data collected by the O2 detector 102, the CO2 and H2O detectors 104, and the temperature, pressure and relative humidity integrated sensor 107. The laser control module 202 is used to control the work of the O2 laser 101, the CO2 and H2O laser 103. The system control and data processing and analysis module 203 is used to process and control the work and data of the data acquisition module 201 and the laser control module 202. The system control and data processing and analysis module 203 has the function of a micro industrial computer, and integrates a high-speed processor, a high-speed storage device, and a Bluetooth communication module. The system control module in the system control and data processing and analysis module 203 integrates a self-written system control communication visualization GUI software, which can generate a simulated laser drive signal, which is input into the laser control module 202 for tuning the laser emission wavelength. The drive waveform includes a single-frequency signal or a mixed-frequency signal such as a sawtooth wave, a triangle wave, a square wave and a sine wave, and integrates a PID algorithm for real-time monitoring and locking the laser working temperature. The data processing module in the system control and data processing and analysis module 203 integrates a self-written visualization GUI software of the gas concentration inversion algorithm, which can be combined with the temperature, pressure and humidity data output by the temperature, pressure and relative humidity integrated sensor 107 to perform real-time analysis and correction of the O2, CO2 and H2O spectral signals collected from two channels. In addition, the Bluetooth communication module in the system control and data processing and analysis module 203 can send the final inverted and corrected O2, CO2 and H2O partial pressure values ​​or concentration values ​​to the data designated receiving terminal in real time, which is used for comprehensive evaluation and accurate analysis of the blood oxygen saturation and vital signs of oxygen supply personnel.

[0033] The dichroic mirror 1 105 and the dichroic mirror 2 106 are both two-phase mirrors, which have an enhanced transmittance effect on incident light of a specific wavelength λ1 and a high reflectance effect on incident light of another wavelength band λ2. In the present invention, the corresponding λ1=761nm or 763nm, and λ2=2683nm. The incident angle of the O2 laser 101 relative to the surface of the dichroic mirror 1 105 is 45°, and the incident angle of the CO2 and H2O lasers 103 relative to the surface of the dichroic mirror 1 105 is 45°. The included angle of the incident laser beams emitted by the O2 laser 101 and the CO2 and H2O lasers 103 is 90°. The incident laser beams emitted by the O2 laser 101 and the CO2 and H2O lasers 103 are incident from the two sides of the dichroic mirror 1 105 respectively and then pass through the dichroic mirror 1 105. The coaxial light beam is coupled into a coaxial light beam through the dichroic mirror 105, passes through the respiratory gas detection area 108, and is then separated into two outgoing laser light beams by the dichroic mirror 106. One outgoing laser light beam is directly received by the CO2 and H2O detector 104 after being reflected by the dichroic mirror 106, and the outgoing angle is 45°. The other outgoing laser light beam passes through the dichroic mirror 106 and is received by the O2 detector 102, and the included angle of the two outgoing laser light beams is 90°.

[0034] Example 2

[0035] The method for synchronously monitoring the multi-component breathing gas of a pressurized oxygen supply mask adopts the device for synchronously monitoring the multi-component breathing gas of a pressurized oxygen supply mask of Example 1 for monitoring, and specifically comprises the following steps:

[0036] (1) The system control and data processing and analysis module 203 generates a simulated laser drive signal, which is input into the laser control module 202 for tuning the emission wavelengths of the O2 laser 101 and the CO2 and H2O lasers 103;

[0037] (2) The two laser beams emitted by the O2 laser 101 and the CO2 and H2O lasers 103 are coupled into a coaxial beam through a dichroic mirror 1 105. The coaxial beam passes through the respiratory gas detection area 108, and then the two laser beams are separated by a dichroic mirror 2 106;

[0038] (3) After the two laser beams are separated, they are received by the O2 detector 102 and the CO2 and H2O detector 104 respectively, and the photoelectric signal conversion is realized, and then output to the data acquisition module 201 in the unit outside the cavity;

[0039] (4) The data acquisition module 201 converts the analog signals independently output by the O2 detector 102 and the CO2 and H2O detectors 104, as well as the signals output by the temperature, pressure and relative humidity integrated sensor 107, into digital signals, and then sends them to the system control and data processing and analysis module 203 via serial communication;

[0040] (5) The system control and data processing and analysis module 203 performs real-time analysis and correction of the spectral signals collected by the O2 detector 102 and the CO2 and H2O detectors 104 in combination with the temperature, pressure and humidity data output by the temperature, pressure and relative humidity integrated sensor 107;

[0041] (6) The system control and data processing and analysis module 203 sends the final corrected O2, CO2, and H2O related data to the designated data receiving terminal in real time for comprehensive evaluation and accurate analysis of the blood oxygen saturation and vital signs of the oxygen supply personnel.

[0042] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A multi-component synchronous monitoring device for breathing gas of a pressurized oxygen mask, characterized in that: include: The mask cavity internal unit includes a photoelectric detection system, the photoelectric detection system includes an O2 laser and an O2 detector for detecting the O2 molecular spectrum, a CO2 and H2O laser, a CO2 and H2O detector for simultaneously detecting the CO2 and H2O molecular spectra, a dichroic mirror 1 and a dichroic mirror 2 for coupling and separating the two laser beams, and an integrated sensor for temperature, pressure and relative humidity placed in the respiratory gas to be detected area; The mask cavity outer unit includes an electronics system, which includes a data acquisition module, a laser control module, and a system control and data processing and analysis module. The data acquisition module is used to collect data collected by O2 detectors, CO2 and H2O detectors, and temperature, pressure and relative humidity integrated sensors. The laser control module is used to control the operation of O2 lasers, CO2 and H2O lasers. The system control and data processing and analysis module is used to process and control the operation and data of the data acquisition module and the laser control module.

2. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 1, characterized in that: The respiratory gas detection area is arranged in the human oral respiratory gas exhalation area in the mask.

3. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 1, characterized in that: The incident angle of the O2 laser relative to the surface of the dichroic mirror one is 45°, the incident angle of the CO2 and H2O lasers relative to the surface of the dichroic mirror one is 45°, the angle between the incident laser beams emitted by the O2 laser and the CO2 and H2O lasers is 90°, the incident laser beams emitted by the O2 laser and the CO2 and H2O lasers are respectively incident from the two sides of the dichroic mirror one and then coupled into a coaxial beam through the dichroic mirror one, the coaxial beam passes through the respiratory gas to be detected area, and then is separated into two outgoing laser beams by the dichroic mirror two, one of which is directly reflected by the dichroic mirror two and then received by the CO2 and H2O detectors, with an exit angle of 45°, and the other is received by the O2 detector after passing through the dichroic mirror two, with an exit angle of 45°, and the angle between the two outgoing laser beams is 90°.

4. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 3, characterized in that: The emission wavelength of the O2 laser is within the spectral range of 760-763nm, which is a spectral window range suitable for measuring O2. The emission wavelength of the CO2 and H2O lasers is within the spectral window range of 2600-2800nm, which is suitable for simultaneously measuring CO2 and H2O.

5. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 3, characterized in that: The O2 laser, CO2 laser and H2O laser all adopt TO5 packaged semiconductor lasers.

6. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 3, characterized in that: The O2 laser, CO2 laser and H2O laser are connected to the laser control module in the outer unit of the mask cavity through a shielded insulated cable. The laser control module outputs a current signal in a specific range to drive the laser to emit laser within a certain wavelength range.

7. A method for synchronously monitoring multi-component respiratory gas from a pressurized oxygen mask, characterized in that: The monitoring is performed using the pressurized oxygen supply mask respiratory gas multi-component synchronous monitoring device described in any one of claims 3 to 6.

8. The method for synchronously monitoring multi-component respiratory gas from a pressurized oxygen supply mask according to claim 7, characterized in that: The following steps are involved: (1) The system control and data processing and analysis module generates a simulated laser drive signal, which is input into the laser control module for tuning the emission wavelengths of the O2 laser and the CO2 and H2O lasers; (2) The two laser beams emitted by the O2 laser and the CO2 and H2O lasers are coupled into a coaxial beam through a dichroic mirror 1. The coaxial beam passes through the respiratory gas detection area and is then separated into two laser beams by a dichroic mirror 2. (3) After the two laser beams are separated, they are received by the O2 detector and the CO2 and H2O detectors respectively, and the photoelectric signals are converted and then output to the data acquisition module in the unit outside the cavity; (4) The data acquisition module converts the analog signals independently output by the O2 detector, CO2 and H2O detectors, and the signals output by the integrated temperature, pressure and relative humidity sensor into digital signals, and then sends them to the system control and data processing and analysis module through serial communication; (5) The system control and data processing and analysis module combines the temperature, pressure and humidity data output by the temperature, pressure and relative humidity integrated sensor to perform real-time analysis and correction on the spectral signals collected by the O2 detector and the CO2 and H2O detectors; (6) The system control and data processing and analysis module sends the final corrected O2, CO2, and H2O data to the designated data receiving terminal in real time for comprehensive evaluation and accurate analysis of the blood oxygen saturation and vital signs of the oxygen supply personnel.

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