Device and method for monitoring exhalation tail end gas of noninvasive ventilator

Abstract

The expiration tail end gas monitoring device comprises a detector, a cavity tube is arranged in the detector, and the cavity tube is connected with the two sides of a nasal mask / face mask through two pipelines so as to construct a circulation channel from the cavity tube to the nasal mask / face mask; a fan is arranged in the cavity tube and is used for generating directional airflow in the cavity tube so as to form circulating airflow in the circulating channel and drive air in the nasal mask / face mask to circularly flow through the cavity tube; a sensor assembly is arranged in the detector, a hole site is formed in the inner wall of the cavity tube, and the detection end of the sensor assembly is arranged in the hole site; the invention also provides a gas monitoring method. An active circulation detection mode is adopted, the cavity tube and the two pipelines in the detector are connected and then installed on the nose mask / face mask to construct a circulation channel, circulation airflow is actively established through the fan, gas in the nose mask / face mask circularly flows through the cavity tube, and therefore the sensor assembly can monitor gas data changes in real time; therefore, accurate data can be provided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical monitoring, and particularly to an end-expiratory gas monitoring device and method for a non-invasive ventilator. Background Art

[0002] A non-invasive ventilator is a medical device for non-invasive assisted breathing. The non-invasive ventilator usually provides a positive pressure airflow at the end of respiration, and the airflow needs to ensure that data such as temperature, humidity, carbon dioxide concentration, and gas pressure meet the needs of the user. Therefore, it is necessary to monitor the end-expiratory gas.

[0003] The gas pressure at the end of respiration is usually monitored in the air supply pipeline, while gas data such as temperature, humidity, and carbon dioxide concentration need to be monitored at the end of respiration to accurately feedback the gas data at the end of respiration. Conventional end-expiratory monitoring devices usually adopt a passive monitoring method, that is, a sensor probe is set at the nasal mask / mask at the end of respiration to connect to the inside of the nasal mask / mask, so as to monitor the gas data inside the nasal mask / mask. Although this monitoring device can monitor the gas inside the nasal mask / mask, due to the respiration effect and the air supply airflow flow effect on the gas inside the nasal mask / mask, the concentration of gas components will change greatly in the same area, and the temperature change also varies by region. However, the passive monitoring device is fixed in a certain fixed area of the nasal mask / mask, and the monitoring value will have large fluctuations, resulting in difficulty in accurately monitoring and analyzing the gas data inside the nasal mask / mask, and thus making it difficult for the non-invasive ventilator to accurately adjust according to the data.

[0004] Therefore, the existing gas monitoring device with passive monitoring is difficult to accurately monitor the gas in the nasal mask / mask because it is fixedly installed at a certain point of the nasal mask / mask, resulting in difficulty for the non-invasive ventilator to accurately adjust according to the monitoring data. Summary of the Invention

[0005] The purpose of the present invention is to provide an end-expiratory gas monitoring device and method for a non-invasive ventilator, so as to solve the technical problem in the prior art that it is difficult to accurately monitor the gas in the nasal mask / mask because it is fixedly installed at a certain point of the nasal mask / mask, resulting in difficulty for the non-invasive ventilator to accurately adjust according to the monitoring data.

[0006] To solve the above technical problem, the present invention specifically provides the following technical solutions:

[0007] An end-expiratory gas monitoring device for a non-invasive ventilator, including a detector, the detector has a cavity tube inside, two ports of the cavity tube extend outward to the outside of the detector to form two connectors, and pipelines are connected to each of the connectors. The two pipelines are respectively used to connect the two sides of the nasal mask / mask to construct a circulation channel from the cavity tube to the nasal mask / mask;

[0008] A fan is provided inside the cavity tube. The fan is used to generate a directional air flow inside the cavity tube to form a circulating air flow in the circulation channel, driving the gas inside the nasal mask / facial mask to circulate through the cavity tube;

[0009] The detector has a sensor assembly inside. There are hole positions on the inner wall of the cavity tube. The detection end of the sensor assembly is placed inside the hole positions.

[0010] Among them, the detector is connected to the non-invasive ventilator through a cable. When the fan drives the gas to form a circulating air flow in the circulation channel, the sensor assembly detects the gas flowing through the cavity tube in real time to actively monitor the gas data at the end of respiration. At the same time, the detector sends the gas data to the non-invasive ventilator in real time.

[0011] As a preferred solution of the present invention, sleeve nozzles and insertion nozzles are respectively installed at both ends of the pipeline. The sleeve nozzles are installed on the connectors, and the insertion nozzles are installed on the nasal mask / facial mask provided with holes;

[0012] Among them, the front end of the insertion nozzle is conical, and the insertion nozzle has elasticity, so that after the insertion nozzle is inserted into the hole of the nasal mask / facial mask, its outer wall elastically abuts against the edge of the hole of the nasal mask / facial mask for sealing.

[0013] As a preferred solution of the present invention, the pipeline includes a main pipe and a plurality of branch pipes. One end of the main pipe is connected to the end of the connector, the other end of the main pipe is connected to the plurality of branch pipes, and the ends of the plurality of branch pipes far from the main pipe are installed on the nasal mask / facial mask;

[0014] Among them, the sleeve nozzle is installed at the end of the main pipe far from the branch pipes, and the insertion nozzles are respectively arranged at the ends of the plurality of branch pipes far from the main pipe.

[0015] As a preferred solution of the present invention, the connection positions of the plurality of branch pipes and the nasal mask / facial mask are distributed in a diffusive manner from the middle to the outside. When the fan drives the gas to form a circulating air flow in the circulation channel, the plurality of branch pipes extract gas from multiple areas inside the nasal mask / facial mask and discharge gas into multiple areas inside the nasal mask / facial mask.

[0016] As a preferred solution of the present invention, the diameters of the plurality of branch pipes are different from each other, and the diameters of the plurality of branch pipes distributed in a diffusive manner gradually decrease from the middle to the outside.

[0017] As a preferred solution of the present invention, the detector is divided into two half shells, and the two half shells are detachably connected. The sensor assembly is fixed on the internal mounting position of one of the half shells;

[0018] A sealing ring is provided at the edge of the hole position or at the detection end edge of the sensor assembly. After the two housings are assembled and installed, the detection end of the sensor assembly presses against the sealing ring to seal the hole position.

[0019] As a preferred solution of the present invention, a seal is provided on the internal carrying position of the other housing, and an opening is provided on the cavity wall of the cavity tube. The seal fits with the opening so that after the two housings are assembled and installed, the seal is embedded in the opening to seal the cavity tube;

[0020] The inner wall of the seal is arc-shaped and the arc radius is equal to the inner wall radius of the cavity tube. A slot is provided on the inner wall of the seal, and one side of the fan is detachably installed in the slot so that after the two housings are assembled and installed, the fan is placed inside the cavity tube.

[0021] As a preferred solution of the present invention, the outer wall of the fan is provided with bumps, and magnetic sheets are provided on both the outer wall of the bumps and the inner wall of the slot. The fan can be adsorbed to the seal through the magnetic sheets on the bumps and in the slot.

[0022] As a preferred solution of the present invention, two contacts are provided on both the bumps and inside the slot. After the bumps are installed inside the slot, the fan is electrically connected to the detector through the contact.

[0023] To solve the above technical problems, the present invention further provides the following technical solutions:

[0024] A monitoring method for an end-expiratory gas monitoring device using the above non-invasive ventilator includes the following steps:

[0025] Step 100: After installing two pipelines on the two connectors of the detector, install the other ends of the two pipelines on both sides of the nasal mask / mask of the preset hole to construct a circulation channel among the detector, the pipeline, and the nasal mask / mask;

[0026] Step 200: Connect the detector to the non-invasive ventilator through a cable and start the detector by power supply from the non-invasive ventilator;

[0027] Step 300: The fan inside the detector works to drive the gas to form a circulating air flow in the circulation channel. The sensor assembly inside the detector detects the circulating air flow inside the cavity tube of the detector in real time. The non-invasive ventilator obtains gas data through the sensor assembly to monitor the end-expiratory gas.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention adopts an active circulation detection method. By connecting the cavity tube and two pipelines in the detector and installing them on the nasal mask / mask to construct a circulation channel, and actively establishing a circulating air flow through a fan, the gas in the nasal mask / mask is circulated through the cavity tube, so that the sensor assembly can monitor the change of gas data in real time to provide relatively accurate data. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained according to the provided drawings without creative efforts.

[0031] Figure 1 FIG. is a schematic structural diagram of an end-expiratory gas monitoring device of a non-invasive ventilator provided by an embodiment of the present invention;

[0032] Figure 2 FIG. is a schematic structural diagram of a pipeline part of an end-expiratory gas monitoring device of a non-invasive ventilator provided by an embodiment of the present invention;

[0033] Figure 3 FIG. is a schematic structural diagram of a cavity tube part of an end-expiratory gas monitoring device of a non-invasive ventilator provided by an embodiment of the present invention;

[0034] Figure 4 FIG. is a schematic structural diagram of a fan part of an end-expiratory gas monitoring device of a non-invasive ventilator provided by an embodiment of the present invention.

[0035] The reference numerals in the figures are respectively as follows:

[0036] 1 - detector; 2 - pipeline; 3 - fan; 4 - sensor assembly;

[0037] 11 - cavity tube; 12 - joint; 13 - hole position; 21 - main pipe; 22 - branch pipe; 31 - convex block; 32 - contact point;

[0038] 101 - housing; 102 - seal; 103 - slot; 104 - magnetic sheet; 211 - sleeve nozzle; 221 - insertion nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] As Figure 1 , Figure 3 shown, the present invention provides an end-expiratory gas monitoring device for a non-invasive ventilator, including a detector 1. The detector 1 has a cavity tube 11 inside. Two ports of the cavity tube 11 extend outward to the outside of the detector 1 to form two connectors 12. A pipeline 2 is connected to each connector 12. The two pipelines 2 are respectively used to connect both sides of a nasal mask / face mask to construct a circulation channel from the cavity tube 11 to the nasal mask / face mask;

[0041] A fan 3 is arranged inside the cavity tube 11. The fan 3 is used to generate a directional air flow inside the cavity tube 11 to form a circulating air flow in the circulation channel, driving the gas in the nasal mask / face mask to circulate through the cavity tube 11;

[0042] The detector 1 has a sensor assembly 4 inside. There is a hole position 13 on the inner wall of the cavity tube 11. The detection end of the sensor assembly 14 is placed inside the hole position 13,

[0043] wherein, the detector 1 is connected to the non-invasive ventilator through a cable. When the fan 3 drives the gas to form a circulating air flow in the circulation channel, the sensor assembly 4 performs real-time detection on the gas flowing through the cavity tube 11 to actively monitor the end-expiratory gas data. At the same time, the detector 1 sends the gas data to the non-invasive ventilator in real time.

[0044] The gas monitoring device of the present invention mainly uses the cavity tube 11 of the detector 1 and two pipelines and the nasal mask / face mask to form a circulation channel. Thus, when the fan 3 inside the cavity tube 11 works, the fan 3 forms a circulating air flow in the circulation channel, enabling the gas in the nasal mask / face mask to circulate through the cavity tube 11. Then, the sensor assembly 4 can perform real-time detection on the gas in the cavity tube 11 to obtain the gas data in the nasal mask / face mask in real time, facilitating the non-invasive ventilator to adjust the air supply parameters according to the real-time gas data.

[0045] Compared with the existing passive gas monitoring device, the gas monitoring device of the present invention adopts an active circulation detection method. By connecting the cavity tube 11 inside the detector 1 and two pipelines 2 and then installing them on the nasal mask / face mask to construct a circulation channel, and actively establishing a circulating air flow through the fan 3, the gas in the nasal mask / face mask is circulated through the cavity tube 11, so that the sensor assembly 4 can monitor the change of gas data in real time to provide relatively accurate data.

[0046] Since the gas in the nasal mask / face mask forms a one-way circulating air flow, compared with passive monitoring, it can effectively avoid the unevenness of carbon dioxide concentration, temperature, humidity, etc. in each area caused by the non-circulation of the gas in the nasal mask / face mask, affecting the accuracy of monitoring and thus the accuracy of adjustment of the non-invasive ventilator.

[0047] When constructing the circulation channel, the pipeline 2 needs to be connected to the nasal mask / facial mask. Therefore, in order to make the constructed circulation channel more stable and avoid air leakage that may affect the accuracy of monitoring, the following preferred embodiments are provided.

[0048] As Figure 1 shown, sleeve nozzles 211 and insertion nozzles 221 are respectively installed at both ends of the pipeline 2. The sleeve nozzle 211 is installed on the joint 12, and the insertion nozzle 22 is installed on the nasal mask / facial mask with preset holes.

[0049] Among them, the front end of the insertion nozzle 221 is conical, and the insertion nozzle 221 is elastic, so that after the insertion nozzle 221 is inserted into the hole of the nasal mask / facial mask, its outer wall elastically abuts against the edge of the hole of the nasal mask / facial mask for sealing.

[0050] In this embodiment, the sleeve nozzle 211 is installed on the joint 12 for sealed connection, and the conical front end of the insertion nozzle 221 can be easily inserted into the hole of the nasal mask / facial mask, and an interference fit can be formed after being inserted tightly. Moreover, the elastic insertion nozzle 221 can also fit tightly with the hole, increasing the firmness and sealing performance.

[0051] Moreover, multi-stage annular grooves or annular protrusions can be provided on the outer wall of the insertion nozzle 221, so that the annular grooves and annular protrusions and the hole restrict each other, making it difficult to fall off.

[0052] The pipeline 2 is used to connect the cavity tube 11 and the nasal mask / facial mask to construct a circulation channel, and the detection target is the gas flowing out of the nasal mask / facial mask. During the wearing and use of the nasal mask / facial mask, due to breathing and air supply, the gas component distribution inside it is dynamic. For example, during exhalation and inhalation, the carbon dioxide concentration in the area close to the mouth and nose is different from that in the area far from the mouth and nose. As breathing and inhalation continue, the carbon dioxide distribution gradually becomes uniform. Therefore, relying solely on the same area circulation is likely to cause large fluctuations in gas detection data, making it difficult to accurately reflect the actual gas data inside the nasal mask / facial mask, that is, affecting the accuracy of monitoring and the accuracy of non-invasive ventilator adjustment. Based on this, the following preferred embodiments are provided.

[0053] As Figure 2 shown, the pipeline 2 includes a main pipe 21 and a plurality of branch pipes 22. One end of the main pipe 21 is connected to the end of the joint 12, the other end of the main pipe 21 is connected to the plurality of branch pipes 22, and the ends of the plurality of branch pipes 22 far from the main pipe 21 are installed on the nasal mask / facial mask.

[0054] Among them, the sleeve nozzle 211 is installed at the end of the main pipe 21 far from the branch pipes 22, and the insertion nozzles 221 are respectively arranged at the ends of the branch pipes 22 far from the main pipe 21.

[0055] In this embodiment, the pipeline 2 is composed of a main pipe 21 and a plurality of branch pipes 22, and the plurality of branch pipes 22 are connected to the nasal mask / face mask, so that gas can be inhaled from different areas inside the nasal mask / face mask and mixed in the main pipe 21 and then enter the cavity pipe 11 for detection, improving the detection accuracy;

[0056] And the detected gas is discharged into multiple areas inside the nasal mask / face mask by the main pipe 21 and the plurality of branch pipes 22, so as to form a large-area flow circulation inside the nasal mask / face mask, further promoting the uniformity of the diffusion of gas components, thereby improving the accuracy.

[0057] In order to ensure that the gas data after mixing is close to the actual gas data inside the nasal mask / face mask, as Figure 2 shown, the connection positions of the plurality of branch pipes 22 to the nasal mask / face mask are distributed in a diffusive manner from the middle to the outside. When the fan 3 drives the gas to form a circulating air flow in the circulation channel, the plurality of branch pipes 22 extract gas from multiple areas inside the nasal mask / face mask and discharge gas into multiple areas inside the nasal mask / face mask.

[0058] In this embodiment, by distributing the connection points of the branch pipes 22 to the nasal mask / face mask in various parts of the nasal mask / face mask and in a diffusive manner, the number of connection points in the area far from the mouth and nose is more than that in the area close to the mouth and nose, so that the gas ratio in the high-concentration area can be effectively reduced and the gas ratio in the low-concentration area (the concentration of the gas to be measured, such as carbon dioxide) can be increased.

[0059] Of course, since the large number of connection points in the area of the branch pipes 22 far from the mouth and nose may cause too much gas mixing in the low-concentration area, resulting in the detected concentration being lower than the actual value, the following preferred embodiment is provided.

[0060] As Figure 2 shown, the diameters of the plurality of branch pipes 22 are not the same, and the diameters of the plurality of branch pipes 22 distributed in a diffusive manner gradually decrease from the middle to the outside.

[0061] In this embodiment, the plurality of branch pipes 22 are divided into specifications of various diameters, so that when installed on the nasal mask / face mask, the number of branch pipes 22 in each area of the nasal mask / face mask can be reasonably allocated to make the concentration of the inhaled gas mixture closer to the concentration inside the nasal mask / face mask.

[0062] Of course, after the monitoring device is used, it needs to be able to be cleaned, disinfected and reused, and the key is the cleaning convenience of the detector 1 part. Based on this, the following preferred embodiment is provided.

[0063] As Figure 1 、 Figure 3 shown, the detector 1 is divided into two half shells 101, and the two half shells 101 are detachably connected, and the sensor assembly 4 is fixed on the internal mounting position of one of the shells 101;

[0064] A sealing ring is provided at the edge of the hole position 13 or at the detection end edge of the sensor assembly 4. After the two housings 101 are assembled and installed, the detection end of the sensor assembly 4 abuts against the sealing ring and seals the hole position 13.

[0065] A seal 102 is provided on the internal mounting position of the other housing 101, and an opening 111 is provided on the wall of the cavity tube 11. The seal 102 fits with the opening 111 so that after the two housings 101 are assembled and installed, the seal 102 is embedded in the opening 111 to seal the cavity tube 11.

[0066] The inner wall of the seal 102 is arc-shaped and the arc radius is equal to the inner wall radius of the cavity tube 11. A slot 103 is provided on the inner wall of the seal 102. One side of the fan 3 is detachably installed in the slot 103 so that after the two housings 101 are assembled and installed, the fan 3 is placed inside the cavity tube 11.

[0067] In this embodiment, the detector 1 adopts a combined structure, which is divided into two housings 101. One housing 101 installs the sensor assembly 4, and the other housing 101 installs the fan 3 through the seal 102. That is, the detection end of the sensor assembly 4 is sealed and installed through the hole position 13, and the fan 3 is sealed and installed in the cavity tube 11 through the prefabricated seal 102 and the preset opening 111. Based on this assembled structure, the cavity tube 11, the sensor assembly 4 and the seal 102 are all easy to disassemble and clean.

[0068] Based on the above embodiment, the following provides a preferred embodiment for the installation of the fan 3.

[0069] As Figure 3 、 Figure 4 shown, the outer wall of the fan 3 has a convex block 31, and magnetic sheets 104 are provided on both the outer wall of the convex block 31 and the inner wall of the slot 103. The fan 3 can be adsorbed on the seal 102 through the magnetic sheets 104 on the convex block 31 and in the slot 103.

[0070] Two contacts 32 are provided on both the convex block 31 and inside the slot 103. After the convex block 31 is installed inside the slot 103, the fan 3 is electrically connected to the detector 1 through the contact of the contacts 32.

[0071] In this embodiment, the outer part of the fan 3 protrudes to form a convex block 31, and the inner wall of the seal 102 has a matching slot 103. The convex block 31 and the slot 103 can be adsorbed and installed through the magnetic sheet 104, so that the contacts 32 are in close contact to ensure the reliability of power supply.

[0072] Based on the above non-invasive ventilator's end-expiratory gas monitoring device, the following provides a non-invasive ventilator's end-expiratory gas monitoring method, including the following steps:

[0073] Step 100: After installing two pipelines on two connectors of the detector, install the other ends of the two pipelines on both sides of the nasal mask / face mask in the preset hole to construct a circulation channel among the detector, the pipelines, and the nasal mask / face mask;

[0074] Step 200: Connect the detector to the non-invasive ventilator through a cable and start the detector by power supply from the non-invasive ventilator;

[0075] Step 300: The fan inside the detector works and drives the gas to form a circulating air flow in the circulation channel. The sensor assembly inside the detector detects the circulating air flow in the internal cavity tube of the detector in real time, and the non-invasive ventilator obtains gas data through the sensor assembly to monitor the gas at the end of respiration.

[0076] The monitoring method of the present invention mainly uses the above-mentioned monitoring device. Specifically, the non-invasive ventilator supplies power to the detector 1, and the fan 3 inside the detector 1 works to form a circulating air flow in the circulation channel. The non-invasive ventilator detects the circulating air flow in the cavity tube 11 in real time through the sensor assembly 4, so as to realize the monitoring of the gas data in the nasal mask / face mask, and then can compare the monitored gas data with the preset gas data threshold to dynamically adjust the gas supply parameters.

[0077] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A non-invasive ventilator end-of-expiratory gas monitoring device, characterized in that: The detector (1) comprises a cavity (11) inside the detector (1), two ports of the cavity (11) extending outward to the outside of the detector (1) to form two joints (12), each of the joints (12) is connected to a pipeline (2), and the two pipelines (2) are respectively used to connect two sides of a nasal mask / face mask to construct a circulation channel from the cavity (11) to the nasal mask / face mask; A fan (3) is arranged in the cavity (11), and the fan (3) is used to generate a directional airflow in the cavity (11) to form a circulating airflow in the circulation channel, driving the gas in the nasal mask / face mask to circulate through the cavity (11); The detector (1) has a sensor assembly (4) therein, and a hole (13) is provided on the inner wall of the cavity (11), and the detection end of the sensor assembly (14) is placed in the hole (13). The detector (1) is connected to the non-invasive ventilator via a cable. When the fan (3) drives the gas to form a circulating airflow in the circulation channel, the sensor component (4) performs real-time detection of the gas flowing through the cavity tube (11) to actively monitor the end-of-respiration gas data. At the same time, the detector (1) sends the gas data to the non-invasive ventilator in real time.

2. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to claim 1, characterized in that: The two ends of the pipeline (2) are respectively provided with a sleeve nozzle (211) and a plug nozzle (221), the sleeve nozzle (211) is installed on the joint (12), and the plug nozzle (22) is installed on a nasal mask / face mask with a preset hole; The front end of the plug-in nozzle (221) is conical, and the plug-in nozzle (221) is elastic, so that after the plug-in nozzle (221) is inserted into the hole of the nasal mask / face mask, its outer wall elastically abuts against the edge of the hole of the nasal mask / face mask to seal.

3. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to claim 2, characterized in that: The pipeline (2) comprises a main pipe (21) and a plurality of branch pipes (22), one end of the main pipe (21) is connected to the end of the joint (12), the other end of the main pipe (21) is connected to the plurality of branch pipes (22), and the ends of the plurality of branch pipes (22) away from the main pipe (21) are mounted on a nasal mask / face mask; The sleeve pipe nozzle (211) is installed at the end of the main pipe (21) away from the branch pipe (22), and the plug pipe nozzle (221) is arranged at the end of each branch pipe (22) away from the main pipe (21).

4. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to claim 3, characterized in that: The connection positions of the plurality of branch pipes (22) with the nasal mask / face mask are diffusely distributed outward from the middle. When the fan (3) drives the gas to form a circulating airflow in the circulation channel, the plurality of branch pipes (22) extract gas from multiple areas in the nasal mask / face mask and discharge gas into multiple areas in the nasal mask / face mask.

5. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to claim 4, characterized in that: The pipe diameters of the plurality of branch pipes (22) are the same at all parts, and the pipe diameters of the plurality of branch pipes (22) distributed in a diffuse manner gradually decrease from the middle part to the outside.

6. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to any one of claims 1 to 5, characterized in that: The detector (1) is divided into two shells (101) in half, the two shells (101) are detachably connected, and the sensor assembly (4) is fixed on an internal loading position of one of the shells (101); A sealing ring is provided at the edge of the hole (13) or at the edge of the detection end of the sensor assembly (4); after the two housings (101) are combined and installed, the detection end of the sensor assembly (4) abuts against the sealing ring and seals the hole (13).

7. The end-expiratory gas monitoring device of a non-invasive ventilator according to claim 6, characterized in that: A sealing member (102) is arranged at an inner position of the other housing (101), an opening (111) is arranged on the wall of the cavity tube (11), and the sealing member (102) fits with the opening (111), so that after the two housings (101) are combined and installed, the sealing member (102) is embedded in the opening (111) and seals the cavity tube (11); The inner wall of the sealing member (102) is arc-shaped and the arc radius is equal to the inner wall radius of the cavity (11). A slot (103) is provided on the inner wall of the sealing member (102). One side of the fan (3) is detachably mounted in the slot (103), so that after the two shells (101) are combined and installed, the fan (3) is placed in the cavity (11).

8. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to claim 7, characterized in that: The outer wall of the fan (3) is provided with a protrusion (31), and magnetic pieces (104) are arranged on the outer wall of the protrusion (31) and the inner wall of the slot (103). The fan (3) can be installed on the sealing member (102) by the magnetic pieces (104) on the protrusion (31) and in the slot (103) being adsorbed on each other.

9. The device for monitoring the end-of-expiratory gas of a non-invasive ventilator according to claim 8, characterized in that: Two contacts (32) are arranged on the protrusion (31) and inside the slot (103); after the protrusion (31) is installed inside the slot (103), the fan (3) is in electrical contact with the detector (1) through the contacts (32).

10. A monitoring method using the end-expiratory gas monitoring device of a non-invasive ventilator according to any one of claims 1 to 9, characterized in that: The steps include: Step 100: After installing the two pipes on the two joints of the detector, the other ends of the two pipes are installed on both sides of the nasal mask / face mask with preset holes to construct a circulation channel between the detector, the pipes and the nasal mask / face mask; Step 200, connecting the detector to the non-invasive ventilator via a cable, and starting the detector through the power supply of the non-invasive ventilator; Step 300, the fan inside the detector works and drives the gas to form a circulating airflow in the circulation channel, the sensor component inside the detector performs real-time detection of the circulating airflow in the internal cavity of the detector, and the non-invasive ventilator obtains gas data through the sensor component to monitor the end-of-breathing gas.

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