Device and method for synchronously monitoring multi-component respiratory gas from a pressurized oxygen mask

Abstract

The present invention discloses a device and method for synchronously monitoring multiple components of respiratory gas in a pressurized oxygen mask. The device comprises an internal unit within the mask cavity, comprising a photoelectric detection system comprising an O2 laser and an O2 detector for detecting the molecular spectrum of O2, CO2 and H2O lasers and CO2 and H2O detectors for simultaneously detecting the molecular spectra of CO2 and H2O, a first dichroic mirror and a second dichroic mirror for coupling and separating the two laser beams, and an integrated temperature, pressure, and relative humidity sensor positioned within the respiratory gas detection area; and an external unit within the mask cavity, comprising an electronics system comprising a data acquisition module, a laser control module, and a system control and data processing and analysis module. The present invention has the advantages of fast response time, intrinsic safety, high stability and reliability, a more compact overall structure, and high general practicality in practical applications.

Description

Technical Field

[0001] The present 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 respiratory gas from a pressurized oxygen supply mask. Background Art

[0002] Oxygen masks, as emergency life-saving devices that transfer oxygen needed for breathing from the oxygen supply system to the lungs, primarily include medical oxygen masks, passenger oxygen masks, and pilot oxygen masks. They play a vital role in treating illnesses and protecting the safety of passengers and pilots. The mask's oxygen flow rate is typically 3-4 L / min, but this flow rate must be adjusted based on the actual application environment and the oxygen provider's blood oxygen saturation and vital sign monitoring data to ensure effective oxygen delivery, especially for patients with different types of illnesses and pilots in aviation environments.

[0003] Oxygen is the primary component of human breath. Based on their detection principles, oxygen sensors can be primarily categorized as electrochemical and optical. Among electrochemical sensors, zirconia sensors are a typical example. They utilize zirconia as an electrolyte, allowing oxygen to react with a platinum electrode at high temperatures to detect and analyze gas concentrations. However, these sensors require high temperatures (hundreds of degrees Celsius), response times exceeding several seconds, and a long warm-up period. They are primarily used in industrial combustion control and various oxygen production and supply systems. Optical oxygen sensors can be categorized based on their technical principles: fluorescence quenching and laser absorption spectroscopy. Fluorescence quenching oxygen sensors utilize the relationship between the fluorescence intensity of a fluorescent material and oxygen concentration, indirectly measuring oxygen concentration by measuring changes in fluorescence intensity. These sensors are primarily used in fields such as life sciences and industrial process control. However, they are susceptible to environmental factors such as temperature, humidity, and light, and have a relatively slow response time, making them difficult to meet the requirements for real-time oxygen monitoring in mask-mounted environments. Laser spectroscopy oxygen sensors utilize 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 special groups such as patients with different types of diseases in the medical field and pilots in aviation working environments when using pressurized oxygen masks, traditional monitoring instruments are bulky, complex to operate, poorly portable, and provide single monitoring data, with the 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 practicality in practical applications.

[0006] In one aspect of the present invention, a device for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen mask is provided. According to an embodiment of the present invention, the device comprises:

[0007] A mask cavity unit, the mask cavity unit including a photoelectric detection system, the photoelectric detection system including an O2 laser and an O2 detector for detecting the O2 molecular spectrum, a CO2 and H2O laser and 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 temperature, pressure, and relative humidity sensor placed in the respiratory gas detection 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 the O2 detector, CO2 and H2O detectors, and the temperature, pressure and relative humidity integrated sensor. The laser control module is used to control the operation of the O2 laser, CO2 and H2O laser. 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 first dichroic mirror is 45°, the incident angle of the CO2 and H2O lasers relative to the surface of the first dichroic mirror is 45°, and the included 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 first dichroic mirror and then coupled into a coaxial beam by the first dichroic mirror. The coaxial beam passes through the respiratory gas to be detected area and is then separated by the second dichroic mirror into two outgoing laser beams. One of the outgoing laser beams is directly reflected by the second dichroic mirror and received by the CO2 and H2O detectors at an outgoing angle of 45°. The other outgoing laser beam passes through the second dichroic mirror and is received by the O2 detector at an outgoing angle of 45°. The included angle between the two outgoing laser beams is 90°.

[0012] In some embodiments of the present invention, the O2 laser emission wavelength is within the spectral range of 760-763nm, which is a spectral window range suitable for measuring O2, and the CO2 and H2O laser emission wavelength range is within 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 all adopt 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, a method for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen supply mask is provided. 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 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, CO2 laser, and H2O laser;

[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 output to the data acquisition module in the unit outside the cavity;

[0021] (4) The data acquisition module converts the analog signals 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] This invention utilizes laser spectral sensing technology, combined with dichroic mirror beam coupling technology, to achieve the layout and integration of multi-component gas sensors within a microcavity within the mask, overcoming the issues of dead space and functional coupling. By simultaneously monitoring other key components of human respiratory gas (CO2 and H2O), it provides real-time monitoring and feedback of oxygen saturation and vital signs for oxygen supply personnel, providing a comprehensive, scientific, and accurate assessment of oxygen supply. Compared to traditional single oxygen sensors, this invention offers fast response time, inherent safety, high stability and reliability, and a more compact overall structure, making it highly practical 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 laser, 104. CO2 and H2O detector, 105. Dichroic mirror 1, 106. Dichroic mirror 2, 107. Integrated sensor for temperature, pressure and relative humidity, 108. Respiratory gas area to be detected, 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 clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall 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 mask cavity internal unit 1 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 the two laser beams, and an integrated temperature, pressure and relative humidity sensor 107 placed in the respiratory gas detection area 108. The respiratory gas detection area 108 is set in the human oral respiratory exhalation area inside 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 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 via shielded insulated cables. The laser control module 202 outputs a current signal within a specific range to drive the laser to emit within a certain wavelength range. The integrated temperature, pressure, and relative humidity sensor 107 is a millimeter-sized microsensor 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 extracavity unit 2 includes an electronics system, including 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 detector 104, and the integrated temperature, pressure, and relative humidity sensor 107. The laser control module 202 is used to control the operation of the O2 laser 101 and the CO2 and H2O laser 103. The system control and data processing and analysis module 203 is used to process and control the operation 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 functions of a micro-industrial computer, integrating a high-speed processor, high-speed storage devices, and a Bluetooth communication module. The system control module within the system control and data processing and analysis module 203 integrates custom-written system control communication visualization GUI software. This software generates simulated laser drive signals, which are input to the laser control module 202 for tuning the laser emission wavelength. Drive waveforms include single-frequency signals or mixed-frequency signals such as sawtooth, triangle, square, and sine waves. A PID algorithm is also integrated for real-time monitoring and locking of the laser operating temperature. The data processing module within the system control and data processing and analysis module 203 integrates custom-written visualization GUI software for gas concentration inversion algorithms. This software combines the temperature, pressure, and humidity data output by the integrated temperature, pressure, and relative humidity sensor 107 to perform real-time analysis and correction of the O2, CO2, and H2O spectral signals collected from the two channels. Furthermore, the Bluetooth communication module within the system control and data processing and analysis module 203 transmits the final inverted and corrected O2, CO2, and H2O partial pressure or concentration values ​​to a designated data receiving terminal in real time, enabling comprehensive assessment and accurate analysis of the oxygen saturation and vital signs of the oxygen supply personnel.

[0033] Both the dichroic mirror 105 and the dichroic mirror 2 106 are dichroic mirrors, which have an anti-transmission effect on incident light of a specific wavelength λ1 and a high reflection 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 105 is 45°, and the incident angle of the CO2 and H2O lasers 103 relative to the surface of the dichroic mirror 105 is 45°. The angle between 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 both sides of the dichroic mirror 105 and pass through the dichroic mirror 105. The coaxial beam is coupled by the dichroic mirror 105, passes through the respiratory gas detection area 108, and is then separated by the dichroic mirror 106 into two outgoing laser beams. One outgoing laser beam is directly reflected by the dichroic mirror 106 and received by the CO2 and H2O detector 104 at an outgoing angle of 45°. The other outgoing laser beam passes through the dichroic mirror 106 and is received by the O2 detector 102 at an outgoing angle of 45°. The angle between the two outgoing laser beams is 90°.

[0034] Example 2

[0035] The method for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen mask is performed using the apparatus for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen mask of Example 1, and specifically comprises the following steps:

[0036] (1) The system control and data processing and analysis module 203 generates a simulated laser drive signal and inputs it 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 laser 103 are coupled into a coaxial beam through the dichroic mirror 105. The coaxial beam passes through the respiratory gas detection area 108 and is then separated into two laser beams by the 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 integrated temperature, pressure and relative humidity 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 on 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 described specific embodiments or replace them in similar ways. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

Claims

1. A multi-component synchronous monitoring device for respiratory gas of a pressurized oxygen mask, characterized in that: include: A mask cavity unit, the mask cavity unit including a photoelectric detection system, the photoelectric detection system including an O2 laser and an O2 detector for detecting the O2 molecular spectrum, a CO2 and H2O laser and 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 temperature, pressure, and relative humidity sensor disposed in a respiratory gas detection area, the respiratory gas detection area being located in the human oral respiratory exhalation area within the mask; A mask cavity external unit, the mask cavity external unit including an electronics system, the electronics system including 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 an O2 detector, a CO2 and H2O detector, and an integrated temperature, pressure, and relative humidity sensor. The laser control module is used to control the operation of the O2 laser, CO2, and H2O laser. 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. The incident angle of the O2 laser relative to the surface of the dichroic mirror is 45°, the incident angle of the CO2 and H2O lasers relative to the surface of the dichroic mirror is 45°, and the included angle of 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 is then separated by the dichroic mirror two into two outgoing laser beams. One of the outgoing laser beams is directly reflected by the dichroic mirror two and received by the CO2 and H2O detectors with an exit angle of 45°. The other outgoing laser beam passes through the dichroic mirror two and is received by the O2 detector with an exit angle of 45°. The included angle of the two outgoing laser beams is 90°.

2. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 1, 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.

3. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 1, characterized in that: The O2 laser, CO2 laser and H2O laser all adopt TO5 package type semiconductor laser.

4. The device for synchronously monitoring multi-component respiratory gas of a pressurized oxygen supply mask according to claim 1, 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 shielded insulated cables. The laser control module outputs a current signal in a specific range to drive the laser to emit laser within a certain wavelength range.

5. A method for synchronously monitoring multiple components of respiratory gas from a pressurized oxygen mask, characterized in that: The monitoring is performed using the pressurized oxygen mask respiratory gas multi-component synchronous monitoring device according to any one of claims 1 to 4, specifically comprising the following steps: (1) The system control and data processing and analysis module generates a simulated laser drive signal, which is input into the laser control module to tune the emission wavelengths of the O2 laser, CO2 laser, and H2O laser; (2) The two laser beams emitted by the O2 laser and the CO2 and H2O lasers are coupled into a coaxial beam through the dichroic mirror 1. The coaxial beam passes through the respiratory gas detection area and is then separated into two laser beams by the 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 signal conversion is realized 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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