High-flow nasal oxygen cannula for collecting end-tidal CO2

Abstract

The invention provides an end-expiratory CO2 collection high-flow nasal oxygen cannula which comprises a nasal oxygen cavity, a fixing band and a breathing connection tube, and the nasal oxygen cavity is provided with an intranasal tube, an anterior nasal oxygen supply port, a CO2 collection cavity and an adjusting body; the adjusting body is manually or automatically controlled, so that the breathing connecting tube is communicated with the intranasal tube and is blocked from the anterior nasal oxygen supply port, and high-flow oxygen therapy in the nasal cavity is provided; during the period, the breathing connecting pipe is intermittently and temporarily communicated with the anterior nasal oxygen supply opening in a sealed mode, the intranasal pipe is communicated with the CO2 collecting cavity, oxygen inhalation outside the nasal cavity is switched, end-expiratory CO2 is monitored, and the device is simple in structure, low in cost, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a high-flow nasal cannula for collecting end-tidal CO2. Background Art

[0002] High-flow oxygen inhalation is a treatment method that uses a high-flow breathing humidification treatment device and a dedicated high-flow nasal cannula to provide patients with inhaled gas with a controllable and relatively constant oxygen concentration (21% - 100%), temperature (31 - 37°C), and humidity at a high flow rate (20 - 100 L / min). It is commonly used for patients with mild to moderate hypoxemia, such as hypoxic respiratory failure, such as patients with ARDS, pneumonia, pulmonary fibrosis, and cardiogenic pulmonary edema.

[0003] During high-flow oxygen inhalation treatment, due to the relatively large oxygen flow rate, it is directly released into the relatively narrow nasal cavity space through the nasal cannula, forming a positive gas pressure within a certain range (generally 2 - 7 cmH2O) in the nasal cavity. When the patient inhales, this pressure forms an inhalation assist, which is beneficial for the rapid entry of gas into the lungs, beneficial for the expansion of the patient's alveoli, and beneficial for oxygenation; however, when the patient exhales, this pressure becomes a resistance, which is not conducive to the patient's exhalation. In patients with a small respiratory amplitude, it may lead to insufficient exhalation of the patient, resulting in CO2 accumulation, and even endangering life in severe cases.

[0004] Therefore, during high-flow oxygen inhalation treatment, it is necessary to repeatedly and timely monitor the patient's blood gas CO2 to promptly detect the patient's disease progression. When the patient's condition improves, it is necessary to discontinue high-flow oxygen inhalation treatment and change it to conventional oxygen inhalation or no oxygen inhalation; when the patient's condition deteriorates, it is necessary to promptly discontinue high-flow oxygen inhalation treatment and change it to non-invasive or invasive mechanical ventilation. Monitoring of blood gas CO2 requires arterial blood sampling and sending it to the laboratory for testing, which is not only inconvenient to operate, costly, but also cannot be continuously monitored, often resulting in adverse events.

[0005] Due to the dilution effect of high-flow gas entering the nasal cavity on the patient's exhaled gas, the existing high-flow nasal cannula cannot use a CO2 monitor to non-invasively collect and continuously monitor the patient's end-tidal CO2, which seriously troubles medical staff.

[0006] To reduce the pain of patients during blood sampling and achieve a more reliable judgment of the patient's pulmonary disease progression, there is an urgent clinical need for a high-flow nasal cannula that can collect and monitor the patient's end-tidal CO2. Summary of the Invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a high-flow nasal cannula for collecting end-tidal CO2, including a nasal oxygen cavity for supplying oxygen in the nasal cavity part, a fixing band for fixing the nasal oxygen cavity in front of the nose on the upper lip, and a breathing connection tube for connecting the nasal oxygen cavity to the oxygen supply port pipeline of a high-flow breathing humidification oxygen therapy device. The nasal oxygen cavity is connected and provided with an intranasal tube for supplying oxygen into the nasal cavity.

[0008] The nasal oxygen cavity is connected with a nasal front oxygen supply port for supplying oxygen in front of the nasal cavity opening and a CO2 collection cavity for connecting with a CO2 collection tube; in the cross-section of the nasal oxygen cavity, the central axis of the gas inlet of the nasal tube and the central axis of the nasal front oxygen supply port form an angle of 15-90°. It also includes an adjusting body for controlling the oxygen supply outlet of the nasal oxygen cavity to be the nasal tube or the nasal front oxygen supply port;

[0009] The adjusting body changes its position in the nasal oxygen cavity so that:

[0010] The breathing connection tube is connected with the nasal tube of the nasal oxygen cavity and blocked from the nasal front oxygen supply port of the nasal oxygen cavity, which is in state A.

[0011] Or, the breathing connection tube is connected with the nasal front oxygen supply port of the nasal oxygen cavity and blocked from the nasal tube of the nasal oxygen cavity; at the same time, the CO2 collection tube is connected with the nasal tube through the CO2 collection cavity, which is in state B.

[0012] The adjusting body includes a CO2 collection cavity arranged in the nasal oxygen cavity and an adjusting tube tightly fitted and embedded in the nasal oxygen cavity, and the adjusting tube is in the same direction as the long axis of the nasal oxygen cavity.

[0013] One side of the adjusting tube is an open port extending out of the nasal oxygen cavity and hermetically connected with the breathing connection tube, and the other side is a blind end. Near the blind end side, a tube oxygen supply outlet adapted to the gas inlet of the nasal tube and the nasal front oxygen supply port is arranged through the side wall of the adjusting tube.

[0014] The adjusting tube changes its position in the nasal oxygen cavity so that:

[0015] The tube oxygen supply outlet corresponds to and is connected with the gas inlet of the nasal tube and blocked from the nasal front oxygen supply port, which is in state A.

[0016] Or, the tube oxygen supply outlet corresponds to and is connected with the nasal front oxygen supply port and blocked from the gas inlet of the nasal tube; at the same time, the CO2 collection cavity is hermetically connected with the gas inlet of the nasal tube, which is in state B.

[0017] The CO2 collection cavity includes a tubular cavity embedded in the side wall of the nasal oxygen cavity. One end of the tubular cavity is connected with the nasal tube, and the other end is connected with the CO2 collection tube.

[0018] Or, the CO2 collection cavity includes a linear oxygen cavity groove recessed from the inner surface of the nasal oxygen cavity to the outer surface of the nasal oxygen cavity. The inner surface of the nasal oxygen cavity is in tight contact with the outer surface of the adjusting tube, and the oxygen cavity groove forms a CO2 collection cavity on the outer surface of the adjusting tube; one end of the oxygen cavity groove is connected with the gas inlet of the nasal tube, and the other end is connected with the CO2 collection tube.

[0019] Alternatively, the CO2 collection cavity includes a tubular cavity embedded in the wall of the adjustment tube. One side of the tubular cavity extends out of the adjustment tube and communicates with the CO2 collection tube; the other side penetrates the outer wall of the adjustment tube at a position corresponding to the gas inlet of the nasal tube, forming a CO2 collection inlet; the included angle formed by the central axis of the CO2 collection inlet and the central axis of the tube oxygen supply outlet in the cross-section of the adjustment tube is adapted to the included angle formed by the central axis of the gas inlet of the nasal tube and the central axis of the nasal front oxygen supply port in the cross-section of the nasal oxygen cavity.

[0020] Alternatively, the CO2 collection cavity includes a linear tube groove provided on the outer wall of the adjustment tube. After the outer surface of the adjustment tube is in tight contact with the inner surface of the nasal oxygen cavity, the tube groove and the inner surface of the nasal oxygen cavity form the CO2 collection cavity; the included angle formed by the central axis of the tube groove and the central axis of the tube oxygen supply outlet in the cross-section of the adjustment tube is adapted to the included angle formed by the central axis of the gas inlet of the nasal tube and the central axis of the nasal front oxygen supply port in the cross-section of the nasal oxygen cavity.

[0021] The CO2 collection cavity includes a tubular cavity embedded in the side wall of the nasal oxygen cavity, or a linear oxygen cavity groove recessed from the inner surface of the nasal oxygen cavity to the outer surface of the nasal oxygen cavity. The inner surface of the nasal oxygen cavity is in tight contact with the outer surface of the adjustment tube, and the oxygen cavity groove forms the CO2 collection cavity on the outer surface of the adjustment tube.

[0022] The adjusting body includes a blocking body disposed in the nasal oxygen cavity. The blocking body moves between the gas inlet of the nasal tube and the nasal front oxygen supply port, such that:

[0023] The blocking body blocks the nasal front oxygen supply port, and at the same time, the gas inlet of the nasal tube is open, which is in state A; or, the blocking body blocks the gas inlet of the nasal tube, and at the same time, the nasal front oxygen supply port is open, which is in state B.

[0024] The adjusting body is provided with an operating part for controlling the movement of the blocking body.

[0025] A nasal inner blocking ring opening is hermetically connected to the gas inlet of the nasal tube in the nasal oxygen cavity, and the annular surface of the nasal inner blocking ring opening is adapted to the corresponding part of the adjacent surface of the blocking body; a nasal front blocking ring opening is hermetically connected to the nasal front oxygen supply port in the nasal oxygen cavity, and the annular surface of the nasal front blocking ring opening is adapted to the corresponding part of the adjacent surface of the blocking body.

[0026] The adjusting body is provided with an automatic control mechanism for controlling the position of the adjusting body in the nasal oxygen cavity, such that:

[0027] State A remains unchanged continuously. Or, state A and state B alternate, and the duration of state A is 0.5 - 3 minutes each time, and the duration of state B is 5 - 30 minutes each time.

[0028] The automatic control mechanism is provided with a control panel for inputting parameters to set the time of state A and state B.

[0029] The structure of the nasal oxygen cavity at the part corresponding to the skin contact in the front of the nose includes: a hollow structure, an airbag structure, and a honeycomb structure.

[0030] The nasal oxygen cavity and the adjustment tube are limited in position with respect to each other in the long axis direction, and the adjustment tube rotates in the nasal oxygen cavity to change its position; or, the central axis rotation directions of the nasal oxygen cavity and the adjustment tube are limited with respect to each other, and the adjustment tube translates and slides in the nasal oxygen cavity to change its position.

[0031] The automatic control mechanism includes an electric power mechanism, a control connection interface, and a power cord. The nasal oxygen cavity and the adjustment body are respectively fixedly connected with connection parts at the ends far from the breathing connection tube; the connection parts are adapted to the control connection interface.

[0032] Advantages of the present invention:

[0033] 1. Realize single or dynamic monitoring of end-expiratory CO2 during high-flow oxygen inhalation, and timely judge the prognosis of the patient's condition;

[0034] 2. During high-flow nasal oxygen inhalation, it is intermittently changed to external nasal oxygen inhalation, which is beneficial to discharging CO2 from the body;

[0035] 3. Reduce the need for regular invasive blood gas examinations during high-flow oxygen inhalation, reduce costs, and reduce pain;

[0036] 4. Reduce the compression injury to the lip and face parts during high-flow oxygen inhalation;

[0037] 5. The structure is simple, the cost is low, and it is easy to promote. Description of the drawings

[0038] Figure 1 It is a structural diagram of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the front part of the nose in the A state of the first embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of the structure of the front part of the nose in the B state of the first embodiment of the present invention;

[0041] Figure 4 It is a schematic diagram of the structure of the front part of the nose in the A state of the second embodiment of the present invention;

[0042] Figure 5 It is a schematic diagram of the structure of the front part of the nose in the B state of the second embodiment of the present invention;

[0043] Figure 6 It is a schematic diagram of the structure of the front part of the nose in the A state of the third embodiment of the present invention;

[0044] Figure 7 It is a schematic diagram of the structure of the front part of the nose in the B state of the third embodiment of the present invention;

[0045] Figure 8 Schematic diagram of the front part of the nose in state A according to the fourth embodiment of the present invention;

[0046] Figure 9 Schematic diagram of the front part of the nose in state B according to the fourth embodiment of the present invention;

[0047] Figure 10 Schematic diagram of the front part of the nose in state A according to the fifth embodiment of the present invention;

[0048] Figure 11 Partial cross-sectional structure diagram of the front part of the nose in state B according to the fifth embodiment of the present invention;

[0049] Figure 12 Schematic diagram of the sixth embodiment of the present invention;

[0050] State A is the state of high-flow oxygen inhalation therapy in the nasal cavity. Oxygen inhalation has pressure assistance, exhalation is slightly obstructed, and the exhaled gas sample collected in the nasal cavity is diluted; State B is the state of high-concentration oxygen inhalation outside the nasal cavity. Oxygen inhalation has no pressure assistance, exhalation is not obstructed, and an exhaled gas sample can be accurately collected in the nasal cavity.

[0051] In the figure,

[0052] 1. Nasal oxygen cavity; 11. Nasal inner tube; 11-1. Gas inlet; 12. Nasal front oxygen supply port; 13. CO2 collection cavity; 13-1. Tubular cavity; 13-2. Oxygen cavity groove; 13-3. Tubular cavity; 13-4. CO2 collection inlet; 13-5. Tube groove; 2. Fixing band; 3; Respiratory connection tube; 4. CO2 collection tube; 5. Adjusting body; 51. Adjusting tube; 51-1. Tube oxygen supply outlet; 52. Sealing body; 52-1. Axial rotation part; 53. Operating part; 6. Automatic control mechanism; 61. Control connection port; 7. Connection part. Detailed implementation manners

[0053] In order to enable those skilled in the art to better understand the technical solution of the present invention and make the above-mentioned features, purposes, and advantages of the present invention clearer and more understandable, the present invention will be further described below in conjunction with embodiments. The embodiments are only used to illustrate the present invention and are not used to limit the protection scope of the present invention.

[0054] The end-tidal CO2 collection high-flow nasal oxygen tube of the present invention includes a nasal oxygen cavity 1 for supplying oxygen in the nasal cavity part, a fixing band 2 for fixing the nasal oxygen cavity 1 at the front position of the upper lip and nose, and a respiratory connection tube 3 for connecting the nasal oxygen cavity 1 to the oxygen supply port pipeline of a high-flow respiratory humidification oxygen therapy instrument. The nasal oxygen cavity 1 is connected and provided with a nasal inner tube 11 for supplying oxygen into the nasal cavity.

[0055] This is the basic structure of an existing high-flow nasal oxygen tube. During actual use, the breathing connection tube 3 is connected to a high-flow breathing humidification oxygen therapy device through a breathing pipeline. The fixing strap 2 fixes the nasal oxygen cavity 1 in front of the upper lip and nose of the patient, and the free end of the nasal inner tube 11 is placed into the patient's nasal cavity. After heating and humidifying a high-flow oxygen-rich gas flow of 20 - 100 L / min, the high-flow breathing humidification oxygen therapy device releases it at high speed into the patient's nasal cavity through the free end of the nasal inner tube 11. Due to the narrow space in the nasal cavity, a gas positive pressure of 2 - 7 cmH2O is formed locally in the nasal cavity, similar to the ventilator PEEP breathing mode. With a slight inhalation movement of the patient, a large amount of oxygen-rich gas rushes into the patient's lungs, fully expanding the alveoli and facilitating oxygenation. However, it is slightly disadvantageous for the patient's exhalation. In patients with insufficient respiratory power, it may lead to difficult exhalation, and the body's CO2 cannot be fully discharged, resulting in the accumulation of CO2 in the blood and the occurrence of risks. Therefore, it is extremely important to monitor the patient's end-tidal CO2 when the patient undergoes high-flow oxygen therapy, which can promptly detect changes in the patient's respiratory condition, thereby terminating high-flow oxygen therapy and converting it to ordinary oxygen therapy or mechanical ventilation support.

[0056] In fact, the change in the patient's condition requires time accumulation, generally within 10 - 30 minutes. Intermittently collecting and monitoring the patient's end-tidal CO2 within this time can fully meet the clinical monitoring requirements; at the same time, high-flow oxygen therapy does not need to be continuously implemented. Intermittently changing to conventional oxygen therapy for a short period (0.5 - 5 minutes) is beneficial for the patient to exhale the waste gas in the lungs and discharge the CO2 in the patient's body, which is more beneficial to the patient's condition.

[0057] To achieve the monitoring of end-tidal CO2 while performing high-flow oxygen therapy, as Figure 1 shown, the nasal oxygen cavity 1 is communicatively provided with a nasal front oxygen supply port 12 for supplying oxygen in front of the nasal cavity opening, and a CO2 collection cavity 13 for communicating with the CO2 collection tube 4 is provided in the nasal oxygen cavity 1; in the cross-section of the nasal oxygen cavity 1, the central axis of the gas inlet 11-1 of the nasal inner tube 11 and the central axis of the nasal front oxygen supply port 12 form an angle of 15 - 90°. The significance of this angle is that when the nasal inner tube 11 is placed in the patient's nasal cavity at an appropriate position, the nasal front oxygen supply port 12 can be located in front of the patient's nostrils, providing oxygen-rich gas for the patient's inhalation.

[0058] When worn correctly, the nasal oxygen cavity 1 is temporarily fixed at the nasal cavity part of the patient by the fixing band 2. The nasal inner tube 11 extends into the nasal cavity, and the nasal front oxygen supply port 12 opens obliquely upward and points to the nasal tip. The optimal angle between the two is 30 - 45°. When controlling the high-flow oxygen in the nasal oxygen cavity 1 to be released into the nasal cavity only through the nasal inner tube 11, it has the same function as the existing high-flow nasal oxygen tube, and a gas positive pressure of 2 - 7 cmH2O can be formed locally. When controlling the high-flow oxygen in the nasal oxygen cavity 1 to be released only through the nasal front oxygen supply port 12 in front of the nostrils, due to the open space, only the oxygen concentration of the inhaled gas is increased, and the oxygen pressure inhaled into the nasal cavity is almost zero, with little obstruction to the patient's exhalation. At this time, when collecting the exhaled gas in the patient's nasal cavity during the exhalation phase, it will not be diluted by the oxygen airflow, and the data is true and reliable. The exhaled gas collected from the patient's nasal cavity during the exhalation phase is inhaled, analyzed, and the CO2 data is displayed by the negative pressure pump of the monitor through the CO2 collection cavity 13 and the connected CO2 collection tube 4. When collecting gas samples, the CO2 collection cavity 13 needs to be connected to the opening part of the patient's nostrils, and its gas collection inlet is preferably able to extend into the nasal cavity to ensure accurate and reliable data.

[0059] As Figure 2-11 shown, the present invention further includes an adjusting body 5 for controlling the oxygen supply outlet of the nasal oxygen cavity 1 to be the nasal inner tube 11 or the nasal front oxygen supply port 12. While ensuring the smooth oxygen supply of the nasal oxygen cavity 1, the nasal front oxygen supply port 12 or the nasal inner tube 11 is closed by the adjusting body 5, so that the oxygen supply outlet of the nasal oxygen cavity 1 is the nasal inner tube 11 or the nasal front oxygen supply port 12. When the oxygen supply outlet of the nasal oxygen cavity 1 is the nasal inner tube 11, traditional high-flow oxygen inhalation treatment can be implemented; when the oxygen supply outlet of the nasal oxygen cavity 1 is the nasal front oxygen supply port 12, it is only high-concentration oxygen inhalation without pressure assistance. At this time, the end-tidal CO2 gas sampling and monitoring can be accurately implemented to timely detect the changes in the patient's respiratory state and condition.

[0060] Manually or automatically change the position of the adjusting body 5 in the nasal oxygen cavity 1 so that: the breathing connection tube 3 is connected to the nasal inner tube 11 of the nasal oxygen cavity 1 and blocked from the nasal front oxygen supply port 12 of the nasal oxygen cavity 1. At this time, the high-flow oxygen is released through the nasal inner tube 11, and a gas positive pressure of 2 - 7 cmH2O is formed locally, entering the high-flow oxygen inhalation treatment state. The patient has pressure assistance during oxygen inhalation, but there is a slight obstruction during exhalation. Due to the dilution of the high-flow oxygen, the exhaled gas sample cannot be accurately collected in the nasal cavity, which is the A state.

[0061] Manually or automatically change the position of the regulator 5 within the nasal oxygen cavity 1 such that: the breathing connection tube 3 communicates with the nasal front oxygen supply port 12 of the nasal oxygen cavity 1 and is blocked from the nasal inner tube 11 of the nasal oxygen cavity 1. At this time, high-flow oxygen is released in front of the nasal cavity through the nasal front oxygen supply port 12. Since there is no obstruction in the space, local gas positive pressure cannot be formed, and there is no obstruction to the patient's exhalation. The patient can exhale smoothly, and the nasal cavity is filled with pure exhaled gas during exhalation. At the same time, the CO2 collection tube 4 communicates with the nasal inner tube 11 through the CO2 collection cavity 13. Under the action of the gas sampling negative pressure pump of the monitor, pure exhaled gas is collected into the monitor through the nasal inner tube 11 placed in the nasal cavity, the CO2 collection cavity 13, and the CO2 collection tube 4, and the CO2 data is analyzed and displayed. At this time, the oxygen concentration of the inhaled gas of the patient increases, but there is no pressure assistance, the exhalation is not obstructed, and the exhaled gas sample can be accurately collected in the nasal cavity, and the end-tidal CO2 value of the patient can be accurately monitored, which is state B.

[0062] During actual treatment, state A is the main state and state B is the auxiliary state. State A improves the patient's oxygen inhalation effect, improves oxygenation, and reduces the opportunity for mechanical ventilation implementation; state B intermittently monitors the end-expiratory gas CO2 value of the patient, which helps to judge the patient's respiratory state, timely understand the progress of the respiratory condition, and change the respiratory support plan when necessary. Depending on the patient's condition, the single implementation time of state B is preferably controlled within 5 minutes, and within 1 minute for patients with more severe conditions.

[0063] As Figure 2-9 shown, the regulator 5 includes a regulating tube 51 tightly fitted and embedded within the nasal oxygen cavity 1, and the regulating tube 51 is in the same long axis direction as the nasal oxygen cavity 1. The inner wall of the nasal oxygen cavity 1 is adapted to the outer wall of the regulating tube 51, and a seal is formed between the two, but they can slide or rotate relative to each other to change the positional relationship between the two. One side of the regulating tube 51 is an open port extending out of the nasal oxygen cavity 1 and is hermetically connected to the breathing connection tube 3. The breathing pipeline of the high-flow breathing humidification oxygen therapy device supplies oxygen to the inner cavity of the regulating tube 51 through the breathing connection tube 3. The other side of the regulating tube 51 is a blind end. Near the blind end side, a tube oxygen supply outlet 51-1 adapted to the gas inlet 11-1 of the nasal inner tube 11 and the nasal front oxygen supply port 12 is provided through the side wall of the regulating tube 51. When the regulating tube 51 changes its position within the nasal oxygen cavity 1, by changing the corresponding positional relationship between the tube oxygen supply outlet 51-1 of the regulating tube 51 and the gas inlet 11-1 of the nasal inner tube 11 or the nasal front oxygen supply port 12, the oxygen supply outlet of the inner cavity of the regulating tube 51 can be set to the nasal inner tube 11 or the nasal front oxygen supply port 12. Specifically:

[0064] The tube oxygen supply outlet 51-1 corresponds to and communicates with the gas inlet 11-1 of the nasal inner tube 11 and is blocked from the nasal front oxygen supply port 12, entering the high-flow oxygen inhalation treatment state, which is state A;

[0065] Alternatively, the tube oxygen supply outlet 51-1 corresponds to and communicates with the nasal front oxygen supply port 12, and is blocked from the gas inlet 11-1 of the nasal tube 11; meanwhile, the CO2 collection chamber 13 is hermetically communicated with the gas inlet 11-1 of the nasal tube 11, entering the state of high-concentration oxygen inhalation outside the nasal cavity and accurately collecting the exhaled gas sample, which is state B.

[0066] With state A as the main state and state B as the auxiliary state, when it is necessary to obtain the patient's respiratory state through end-tidal CO2 monitoring, temporarily switch to state B, return to state A after obtaining the data, and the purpose of high-flow oxygen therapy and intermittent monitoring of the patient's exhaled CO2 can be achieved.

[0067] Specifically, as Figure 2-3 shown, in the first embodiment of the present invention, the CO2 collection chamber 13 includes a tubular chamber 13-1 embedded in the side wall of the nasal oxygen chamber 1. One end of the tubular chamber 13-1 communicates with the nasal tube 11, and the other end communicates with the CO2 collection tube 4.

[0068] Or, as Figure 4-5 shown, in the second embodiment of the present invention, the CO2 collection chamber 13 includes a linear oxygen chamber groove 13-2 recessed from the inner surface of the nasal oxygen chamber 1 to the outer surface of the nasal oxygen chamber 1. The inner surface of the nasal oxygen chamber 1 is in tight fit contact with the outer surface of the adjustment tube 51, and the oxygen chamber groove 13-2 forms the CO2 collection chamber 13 on the outer surface of the adjustment tube 51; one end of the oxygen chamber groove 13-2 communicates with the gas inlet 11-1 of the nasal tube 11, and the other end communicates with the CO2 collection tube 4.

[0069] Actually, the above two structures can be implemented separately, or can be implemented in cooperation with each other by the tubular chamber 13-1 or the oxygen chamber groove 13-2 as long as a CO2 collection chamber 13 communicating with the nasal tube 11 can be formed and communicated with the CO2 collection tube 4.

[0070] In the first and second embodiments, regardless of state A or state B, the nasal tube 11 is continuously communicated with the CO2 collection tube 4 through the CO2 collection chamber 13 formed on the outer surface of the adjustment tube 51 by the tubular chamber 13-1 or the oxygen chamber groove 13-2, and the monitor can continuously collect gas samples from the nasal cavity. However, in state A, due to the dilution effect of the high-flow oxygen stream in the nasal cavity, the exhaled gas sample collected during exhalation is diluted, and the obtained end-tidal CO2 data is on the low side and has little clinical value; in state B, the high-flow oxygen supply is released outside the nasal cavity, with extremely little hindrance to exhalation. During exhalation, the exhaled gas fills the nasal cavity, and the exhaled gas sample in the nasal cavity is pure. The obtained end-tidal CO2 data is accurate and has extremely high clinical value.

[0071] There are mainly two schemes for the adjustment tube 51 to change its position in the nasal oxygen chamber 1:

[0072] One is, as Figure 2-5As shown: The nasal oxygen chamber 1 and the regulating tube 51 are limited in position with respect to each other in the long axis direction. There is no need for excessive redundancy in the lengths of the nasal oxygen chamber 1 and the regulating tube 51. The regulating tube 51 only needs to have one tube oxygen supply outlet 51-1 penetrating the side wall. The regulating tube 51 changes its position within the nasal oxygen chamber 1 by rotation. By rotating, the corresponding position relationship between the tube oxygen supply outlet 51-1 of the regulating tube 51 and the gas inlet 11-1 of the nasal inner tube 11 or the nasal front oxygen supply port 12 is changed, so that the tube oxygen supply outlet 51-1 is communicated with one of the gas inlet 11-1 of the nasal inner tube 11 or the nasal front oxygen supply port 12 and blocked from the other, thereby selecting the inner cavity oxygen supply outlet of the regulating tube 51 to be the gas inlet 11-1 of the nasal inner tube 11 or the nasal front oxygen supply port 12. When the rotation scheme is adopted, after the nasal oxygen chamber 1 and the regulating tube 51 are assembled, the gas inlet 11-1 of the nasal inner tube 11, the nasal front oxygen supply port 12, and the tube oxygen supply outlet 51-1 of the regulating tube 51 are all at different circumferential angles at the corresponding positions of the same length in the long axis. For convenient use, it is preferably to set limits on both sides of the rotation direction. When rotating to one extreme side, the tube oxygen supply outlet 51-1 of the regulating tube 51 is correspondingly communicated with the gas inlet 11-1 of the nasal inner tube 11, while the nasal front oxygen supply port 12 is blocked by the wall of the regulating tube 51; when rotating to the other extreme side, the tube oxygen supply outlet 51-1 of the regulating tube 51 is correspondingly communicated with the nasal front oxygen supply port 12, while the gas inlet 11-1 of the nasal inner tube 11 is blocked by the wall of the regulating tube 51 and blocked from the inner cavity of the nasal oxygen chamber 1.

[0073] Secondly, without a matching diagram, the nasal oxygen chamber 1 and the regulating tube 51 are limited in position with respect to each other in the direction of the central axis rotation. The lengths of the nasal oxygen chamber 1 and the regulating tube 51 should be greater than twice the lengths of the tube oxygen supply outlet 51-1 and the nasal front oxygen supply port 12. The regulating tube 51 changes its position within the nasal oxygen chamber 1 by translational sliding. The regulating tube 51 needs to have two tube oxygen supply outlets 51-1 penetrating the side wall. One is used to correspondingly communicate with the gas inlet 11-1 of the nasal inner tube 11, and the other is used to correspondingly communicate with the nasal front oxygen supply port 12. The included angle between the two tube oxygen supply outlets 51-1 in the cross-section of the regulating tube 51 is the same as the included angle formed by the central axis of the gas inlet 11-1 of the nasal inner tube 11 and the central axis of the nasal front oxygen supply port 12 in the cross-section of the nasal oxygen chamber 1. There is a certain distance between the two tube oxygen supply outlets 51-1 at the head and tail in the long axis direction. By translational sliding, the corresponding position relationship between the tube oxygen supply outlet 51-1 of the regulating tube 51 and the gas inlet 11-1 of the nasal inner tube 11 or the nasal front oxygen supply port 12 is changed, so as to select one of the two tube oxygen supply outlets 51-1 of the regulating tube 51 to be communicated with the gas inlet 11-1 of the nasal inner tube 11 or the nasal front oxygen supply port 12 as the oxygen supply outlet of the regulating tube 51, and the other is blocked by the side wall of the outer nasal oxygen chamber 1.

[0074] Further, as Figure 6-7As shown, this is the third embodiment of the present invention. The CO2 collection chamber 13 includes a tubular chamber 13-3 embedded in the wall of the adjustment tube 51. One side of the tubular chamber 13-3 extends out of the adjustment tube 51 and is connected to the CO2 collection tube 4; the other side penetrates the outer wall of the adjustment tube 51 at the position corresponding to the gas inlet 11-1 of the nasal inner tube 11 to form a CO2 collection inlet 13-4. The angle formed by the central axis of the CO2 collection inlet 13-4 and the central axis of the tube oxygen supply outlet 51-1 in the cross-section of the adjustment tube 51 is adapted to the angle formed by the central axis of the gas inlet 11-1 of the nasal inner tube 11 and the central axis of the nasal front oxygen supply port 12 in the cross-section of the nasal oxygen chamber 1.

[0075] Or, as Figure 8-9 As shown, this is the fourth embodiment of the present invention. The CO2 collection chamber 13 includes a linear tube groove 13-5 provided on the outer wall of the adjustment tube 51. After the outer surface of the adjustment tube 51 is in tight contact with the inner surface of the nasal oxygen chamber 1, the tube groove 13-5 and the inner surface of the nasal oxygen chamber 1 form the CO2 collection chamber 13; the angle formed by the central axis of the tube groove 13-5 and the central axis of the tube oxygen supply outlet 51-1 in the cross-section of the adjustment tube 51 is adapted to the angle formed by the central axis of the gas inlet 11-1 of the nasal inner tube 11 and the central axis of the nasal front oxygen supply port 12 in the cross-section of the nasal oxygen chamber 1.

[0076] Regardless of the third or fourth embodiment, when changing the position of the adjustment tube 51 in the nasal oxygen chamber 1, it is preferably in a rotational manner, and only one tube oxygen supply outlet 51-1 needs to be provided through the side wall of the adjustment tube 51.

[0077] When the tube oxygen supply outlet 51-1 is correspondingly connected to the nasal front oxygen supply port 12, the breathing tube of the high-flow respiratory humidified oxygen therapy instrument supplies oxygen to the inner cavity of the adjustment tube 51 through the breathing connection tube 3, and supplies oxygen in front of the outer side of the nasal cavity through the tube oxygen supply outlet 51-1 and the nasal front oxygen supply port 12; at the same time, the CO2 collection inlet 13-4 is correspondingly connected to the gas inlet 11-1 of the nasal inner tube 11. During exhalation, the nasal cavity is filled with pure exhaled gas, and the exhalation sample passes through the nasal inner tube 11, the tubular chamber 13-3 or the tube groove 13-5, the CO2 collection chamber 13 formed by the inner surface of the nasal oxygen chamber 1, and the CO2 collection tube 4 and is collected into the monitor for analysis and data display, entering state B.

[0078] When the tube oxygen supply outlet 51-1 is correspondingly connected to the gas inlet 11-1 of the nasal inner tube 11, the breathing tube of the high-flow respiratory humidified oxygen therapy instrument supplies oxygen to the inner cavity of the adjustment tube 51 through the breathing connection tube 3, and supplies oxygen in the nasal cavity through the tube oxygen supply outlet 51-1 and the nasal inner tube 11, entering state A; at the same time, the CO2 collection inlet 13-4 is blocked by the side wall of the nasal oxygen chamber 1, terminating the collection and monitoring of end-tidal CO2.

[0079] It should be emphasized here that the CO2 collection cavity 13 can adopt any one or a combination of multiple solutions in the first, second, third, and fourth embodiments, and finally form a cavity communicating with the inner cavity of the nasal tube 11.

[0080] As Figure 10-11 shown, this is the fifth embodiment of the present invention. The CO2 collection cavity 13 includes a tubular cavity 13-1 embedded in the side wall of the nasal oxygen cavity 1; or a linear oxygen cavity groove 13-2 recessed from the inner surface of the nasal oxygen cavity 1 to the outer surface of the nasal oxygen cavity 1. The inner surface of the nasal oxygen cavity 1 is in tight fit contact with the outer surface of the adjustment tube 51, and the oxygen cavity groove 13-2 forms the CO2 collection cavity 13 on the outer surface of the adjustment tube 51. The adjustment body 5 includes a blocking body 52 disposed in the nasal oxygen cavity 1. The blocking body 52 moves between the gas inlet 11-1 of the nasal tube 11 and the nasal front oxygen supply port 12, so that:

[0081] The blocking body 52 blocks the nasal front oxygen supply port 12, and at the same time, the gas inlet 11-1 of the nasal tube 11 is open, which is in state A; or, the blocking body 52 blocks the gas inlet 11-1 of the nasal tube 11, and at the same time, the nasal front oxygen supply port 12 is open, which is in state B. In this embodiment, by the blocking body 52, the oxygen supply outlet of the nasal oxygen cavity 1 is selected, so as to achieve the switching between state A and state B.

[0082] During specific implementation, in order to improve the stability of the blocking body 52 moving and blocking between the gas inlet 11-1 of the nasal tube 11 and the nasal front oxygen supply port 12, a shaft rotation part 52-1 is connected to the inner wall of the nasal oxygen cavity 1 between the gas inlet 11-1 of the nasal tube 11 and the nasal front oxygen supply port 12. The shaft rotation part 52-1 should be set on the symmetric central axis section of the gas inlet 11-1 of the nasal tube 11 and the nasal front oxygen supply port 12, preferably at a position equidistant from the gas inlet 11-1 and the nasal front oxygen supply port 12 and with the same angle. The outer shapes of both sides of the blocking body 52 are respectively adapted to the adjacent gas inlet 11-1 of the nasal tube 11 and the nasal front oxygen supply port 12. When the blocking body 52 moves, when one side surface touches the gas inlet 11-1 of the nasal tube 11, or the other side surface touches the nasal front oxygen supply port 12, a stable blocking effect can be formed.

[0083] The preferred solution is: a soft everted nasal inner blocking ring mouth is hermetically connected and arranged in the nasal oxygen cavity 1 with the gas inlet 11-1 of the nasal tube 11, and the ring surface of the nasal inner blocking ring mouth is adapted to the corresponding part of the adjacent surface of the blocking body 52; a soft everted nasal front blocking ring mouth is hermetically connected and arranged in the nasal oxygen cavity 1 with the nasal front oxygen supply port 12, and the ring surface of the nasal front blocking ring mouth is adapted to the corresponding part of the adjacent surface of the blocking body 52. The ring mouths of the nasal inner blocking ring mouth and the nasal front blocking ring mouth are preferably set as standard planes, and are integrally formed with a soft material. Correspondingly, the blocking body 52 is set as a hard sheet, and both sides are standard planes, and the area is larger than the ring surfaces of the nasal inner blocking ring mouth and the nasal front blocking ring mouth.

[0084] Furthermore, for convenience of operation, an operation part 53 for controlling the blocking position of the blocking body 52 is arranged outside the nasal oxygen cavity 1 for fixedly connecting the adjusting body 5. The operation part 53 is preferably located at the extension line position of the rotation axis of the shaft rotation part 52-1. Similarly, in the first, second, third, and fourth embodiments, the operation part 53 for controlling the movement of the adjusting pipe 51 is preferably arranged outside the nasal oxygen cavity 1 where the adjusting pipe 51 extends out. Through the operation part 53, the movement of the adjusting body 5 (including the adjusting pipe 51 and the blocking body 52) in the nasal oxygen cavity 1 can be effectively controlled, enabling the product to enter the A state or the B state, which is convenient for use and operation.

[0085] As Figure 12 shown, the adjusting body 5 is detachably connected with an automatic control mechanism 6 for controlling the position of the adjusting body 5 in the nasal oxygen cavity 1. The automatic control mechanism 6 includes an electric mechanism, a power cord, a power supply, and a controller for temporarily fixing and connecting the operation part 53 of the adjusting body 5 and the end of the nasal oxygen cavity 1. Through the electric mechanism (including a motor, electromagnetic power, etc.), the operation part 53 is driven to rotate or translate and slide in the nasal oxygen cavity 1, thereby controlling the use state of the present invention, specifically: the A state remains unchanged continuously, which is the same as traditional high-flow oxygen therapy; or, the A state and the B state alternate.

[0086] To ensure safety, the duration of the A state lasts for 5 - 30 minutes or more each time. The more severe the condition, the longer the single duration needs to be. The single duration of the B state needs to be limited and should not be too long. It is sufficient for the monitor to collect the exhaled gas sample from the nasal cavity through the nasal tube 11, the CO2 collection cavity 13, and the CO2 collection tube 4 for analysis and display of data. Too long a time may affect the high-flow oxygen therapy effect. The single duration of the B state depends on the patient's respiratory condition. The more severe the condition, the shorter the time should be, but the longest time should not exceed 5 minutes, and 1 - 3 minutes is optimal.

[0087] It should be noted that: a reset mechanism, such as a spring, should be set up for the operation part 53. When the power is disconnected or exhausted, the reset mechanism acts on the operation part 53 to automatically switch the product to the A use state, ensuring the high-flow oxygen therapy treatment effect and avoiding risks caused by long-term interruption of flow oxygen therapy.

[0088] Furthermore, the automatic control mechanism 6 is provided with a control panel for inputting parameter settings for the single-duration of states A and B and the total duration of high-flow oxygen therapy. Through the control panel, medical staff can freely set the single-duration of states A and B according to the patient's condition. By state B, the end-tidal CO2 data of the patient can be effectively and dynamically monitored to judge the change of the patient's condition. By the duration of state A, the frequency of the appearance of state B can be controlled to ensure the effect of improving oxygenation by high-flow oxygen therapy. The alternation of states A and B not only ensures the effect of high-flow oxygen therapy but also can dynamically monitor the end-tidal CO2 of the patient to judge the progress state of the patient's respiratory condition. The automatic control mechanism 6 and the control panel are both conventional technologies, and their specific schemes will not be elaborated here.

[0089] Furthermore, the duration of high-flow oxygen therapy is generally relatively long, often accompanied by redness, itching, and even ulceration of the skin in front of the upper lip and nose. In order to reduce the pressure injury of the nasal oxygen cavity 1 on the skin contact part in front of the upper lip and nose, the structure of the nasal oxygen cavity 1 at the corresponding skin contact part in front of the nose includes: a hollow structure, an airbag structure, and a honeycomb structure, such as a sponge, a multi-bubble airbag structure, a shock-absorbing bubble film structure, and an overlapping hollow hole structure. When receiving high-flow oxygen therapy, the patient is not necessarily in an anesthetic state but may also be in a conscious state, and may be accompanied by movements such as head twisting and expectoration. Through the setting of these structures, the area stability of the skin contact part between the nasal oxygen cavity 1 and the skin in front of the upper lip and nose can be effectively maintained, reducing friction and pressure, thereby reducing skin abrasion and compression injury.

[0090] As Figure 12 shown, the automatic control mechanism 6 includes an electric power mechanism, a control connection interface 61, and a power cord; the power cord is connected to the power supply to provide energy for the electric power mechanism, and the electric power mechanism provides power for the position change of the nasal oxygen cavity 1 and the adjustment body 5. Specifically, the nasal oxygen cavity 1 and the adjustment body 5 are respectively fixedly connected with connection parts 7 at the ends away from the breathing connection tube 3; the connection part 7 is adapted to the control connection interface 61. Specifically, the connection part 7 includes an outer connection part fixedly connected with the nasal oxygen cavity 1 on the outside (which is the end position of the nasal oxygen cavity 1 adjacent to the operation part 53 described above) and an inner connection part fixedly connected with the adjustment body 5 on the inside (which is the operation part 53 described above). The long axis directions of the outer connection part and the inner connection part are relatively fixed, and they can rotate relative to each other in the circumferential direction, so as to realize the change of the position of the adjustment body 5 in the nasal oxygen cavity 1. Correspondingly, the control connection interface 61 also includes an outer control connection interface fixed to the motor housing on the outside and an inner control connection interface fixed to the motor rotating shaft on the inside. By setting non-circular insertion or socket interfaces between the outer connection part, the inner connection part, the outer control connection interface, and the inner control connection interface, the outer control connection interface is connected to the outer connection part, so as to be fixedly connected with the nasal oxygen cavity 1; the inner control connection interface is connected to the inner connection part, so as to be fixedly connected with the adjustment body 5, thereby realizing the control of the position of the adjustment body 5 in the nasal oxygen cavity 1 when the motor rotates.

[0091] It should be noted that: if an automatic control mechanism is adopted, a reset mechanism such as a spring should be provided in the operation part 53. When the power is turned off or exhausted, regardless of the usage state of the product, the reset mechanism acts on the operation part 53, and it will automatically switch to the A usage state to ensure the high-flow oxygen therapy treatment effect and avoid the risks caused by long-term interruption of high-flow oxygen therapy.

[0092] The above embodiments are only illustrative of the principles and effects of this patent application and are not intended to limit this patent application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A high-flow nasal oxygen tube for collecting end-tidal CO2, comprising a nasal oxygen chamber (1) for supplying oxygen to the nasal cavity, a fixing band (2) for fixing the nasal oxygen chamber (1) at the front position of the upper lip and nose, and a breathing connection tube (3) for connecting the nasal oxygen chamber (1) with an oxygen supply port pipeline of a high-flow respiratory humidification oxygen therapy device, the nasal oxygen chamber (1) is connected to an intranasal tube (11) for supplying oxygen to the nasal cavity, characterized in that: The nasal oxygen cavity (1) is connected to a front nasal oxygen supply port (12) for supplying oxygen to the front of the nasal cavity opening; in the cross section of the nasal oxygen cavity (1), the central axis of the gas inlet (11-1) of the nasal tube (11) and the central axis of the front nasal oxygen supply port (12) form an angle of 15-90°; It also includes a CO2 collection chamber (13) arranged in the nasal oxygen chamber (1) for communicating with the CO2 collection tube (4) and a regulating body (5) for controlling the oxygen supply outlet of the nasal oxygen chamber (1) to be an intranasal tube (11) or a frontal nasal oxygen supply port (12); The regulating body (5) changes its position in the nasal oxygen cavity (1) so that: The breathing connection tube (3) is connected to the intranasal tube (11) of the nasal oxygen chamber (1) and is blocked from the anterior nasal oxygen supply port (12) of the nasal oxygen chamber (1), which is state A; Alternatively, the breathing connection tube (3) is connected to the anterior nasal oxygen supply port (12) of the nasal oxygen cavity (1) and is blocked from the intranasal tube (11) of the nasal oxygen cavity (1); at the same time, the CO2 collection tube (4) is connected to the intranasal tube (11) through the CO2 collection cavity (13), which is state B.

2. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 1, characterized in that: The regulating body (5) comprises a regulating tube (51) which is tightly fitted and embedded in the nasal oxygen cavity (1), and the long axes of the regulating tube (51) and the nasal oxygen cavity (1) are in the same direction; One side of the regulating tube (51) is an open port extending out of the nasal oxygen cavity (1) and sealedly connected to the breathing connection tube (3), and the other side is a blind end. A tube oxygen supply outlet (51-1) adapted to the gas inlet (11-1) of the intranasal tube (11) and the front nasal oxygen supply port (12) is provided through the side wall of the regulating tube (51) near the blind end; The regulating tube (51) changes position in the nasal oxygen cavity (1) so that: The tube oxygen supply outlet (51-1) corresponds to and is connected to the gas inlet (11-1) of the intranasal tube (11), and is blocked from the front nose oxygen supply port (12), which is state A; Alternatively, the tube oxygen supply outlet (51-1) corresponds to and is connected to the anterior nasal oxygen supply port (12), and is blocked from the gas inlet (11-1) of the intranasal tube (11); at the same time, the CO2 collection chamber (13) is in sealed communication with the intranasal tube (11), which is state B.

3. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 2, characterized in that: The CO2 collection chamber (13) comprises a tubular chamber (13-1) embedded in the side wall of the nasal oxygen chamber (1), one end of the tubular chamber (13-1) is connected to the intranasal tube (11), and the other end is connected to the CO2 collection tube (4); Alternatively, the CO2 collection chamber (13) comprises a linear oxygen chamber groove (13-2) that is recessed from the inner surface of the nasal oxygen chamber (1) to the outer surface of the nasal oxygen chamber (1), the inner surface of the nasal oxygen chamber (1) is in tight contact with the outer surface of the regulating tube (51), and the oxygen chamber groove (13-2) forms a CO2 collection chamber (13) on the outer surface of the regulating tube (51); one end of the oxygen chamber groove (13-2) is connected to the gas inlet (11-1) of the nasal tube (11), and the other end is connected to the CO2 collection tube (4); Alternatively, the CO2 collection chamber (13) comprises a tubular chamber (13-3) embedded in the tube wall of the regulating tube (51); one side of the tubular chamber (13-3) exits the regulating tube (51) and is connected to the CO2 collection tube (4); the other side penetrates the outer side of the tube wall of the regulating tube (51) at a position corresponding to the gas inlet (11-1) of the intranasal tube (11) to form a CO2 collection inlet (13-4); the angle formed by the central axis of the CO2 collection inlet (13-4) in the cross section of the regulating tube (51) and the central axis of the tube oxygen supply outlet (51-1) is adapted to the angle formed by the central axis of the gas inlet (11-1) of the intranasal tube (11) and the central axis of the frontal oxygen supply port (12) in the cross section of the nasal oxygen chamber (1); Alternatively, the CO2 collection chamber (13) comprises a linear tube groove (13-5) arranged on the outer tube wall of the regulating tube (51); after the outer surface of the regulating tube (51) is tightly fitted and contacted with the inner surface of the nasal oxygen chamber (1), the tube groove (13-5) and the inner surface of the nasal oxygen chamber (1) form the CO2 collection chamber (13); the angle formed by the central axis of the tube groove (13-5) in the cross section of the regulating tube (51) and the central axis of the tube oxygen supply outlet (51-1) is adapted to the angle formed by the central axis of the gas inlet (11-1) of the nasal tube (11) and the central axis of the front nasal oxygen supply port (12) in the cross section of the nasal oxygen chamber (1).

4. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 1, characterized in that: The CO2 collection cavity (13) comprises a tubular cavity (13-1) embedded in the side wall of the nasal oxygen cavity (1), or a linear oxygen cavity groove (13-2) recessed from the inner surface of the nasal oxygen cavity (1) to the outer surface of the nasal oxygen cavity (1), the inner surface of the nasal oxygen cavity (1) is in tight contact with the outer surface of the regulating tube (51), and the oxygen cavity groove (13-2) forms a CO2 collection cavity (13) on the outer surface of the regulating tube (51); The regulating body (5) comprises a blocking body (52) arranged in the nasal oxygen cavity (1), and the blocking body (52) moves between the gas inlet (11-1) of the intranasal tube (11) and the frontal oxygen supply port (12), so that: The blocking body (52) blocks the front nose oxygen supply port (12), and at the same time, the gas inlet (11-1) of the intranasal tube (11) is open, which is state A; or, the blocking body (52) blocks the gas inlet (11-1) of the intranasal tube (11), and at the same time, the front nose oxygen supply port (12) is open, which is state B; The regulating body (5) is provided with an operating part (53) for controlling the movement of the blocking body (52).

5. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 4, characterized in that: The nasal oxygen cavity (1) is provided with an intranasal sealing ring opening which is sealed and connected with the gas inlet (11-1) of the intranasal tube (11), and the ring opening surface of the intranasal sealing ring opening is matched with the corresponding part of the adjacent surface of the sealing body (52); the nasal oxygen cavity (1) is provided with a front nasal sealing ring opening which is sealed and connected with the front nasal oxygen supply port (12), and the ring opening surface of the front nasal sealing ring opening is matched with the corresponding part of the adjacent surface of the sealing body (52).

6. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 1, characterized in that: The regulating body (5) is provided with an automatic control mechanism (6) for controlling the regulating body (5) at the position of the nasal oxygen cavity (1) so that: A state continues unchanged; Alternatively, state A and state B are alternated, with a single duration of state A of 0.5-3 minutes and a single duration of state B of 5-30 minutes.

7. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 6, characterized in that: The automatic control mechanism (6) is provided with a control panel for inputting parameters to set the A state and B state time.

8. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 1, characterized in that: The structure of the nasal oxygen chamber (1) at the position corresponding to the contact with the skin of the front part of the nose comprises: a hollow structure, an air bag structure and a honeycomb structure.

9. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 2, characterized in that: The nasal oxygen cavity (1) and the regulating tube (51) are mutually limited in the long axis direction, and the regulating tube (51) rotates in the nasal oxygen cavity (1) to change its position; Alternatively, the central axes of the nasal oxygen chamber (1) and the regulating tube (51) are mutually limited in rotation direction, and the regulating tube (51) changes position by sliding in translation in the nasal oxygen chamber (1).

10. The high-flow nasal oxygen cannula for collecting end-tidal CO2 according to claim 6, characterized in that: The automatic control mechanism (6) comprises an electric power mechanism, a control interface (61), and a power line; The nasal oxygen chamber (1) and the regulating body (5) are respectively fixedly connected to form a connecting portion (7) at the end away from the breathing connecting tube (3); the connecting portion (7) is adapted to the control connecting port (61).

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