High-flow nasal oxygen cannula for collecting CO2 and use method of high-flow nasal oxygen cannula

Abstract

The invention provides a CO2 collection high-flow nasal oxygen cannula and a using method thereof.The CO2 collection high-flow nasal oxygen cannula comprises a nasal oxygen cavity, a fixing band and a breathing connection tube, the nasal oxygen cavity is communicated with an intranasal tube and a CO2 collection tube cavity, a CO2 collection tube is embedded in the CO2 collection tube cavity, a water-blocking ventilation section is arranged at the head end of the CO2 collection tube, during high-flow oxygen inhalation treatment, the CO2 collection tube is placed in the nasal cavity of a patient through the CO2 collection tube cavity, and the CO2 collection tube is inserted into the nasal cavity of the patient through the fixing band; the end-expiratory CO2 of the patient is synchronously and continuously monitored, nasal cavity mucus is prevented from blocking the cavity, the structure is simple, cost is low, and safety and reliability are achieved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a CO2 collection high-flow nasal oxygen tube and a use method thereof. Background Art

[0002] High-flow oxygen inhalation uses a high-flow respiratory humidification therapy device and a dedicated high-flow nasal oxygen cannula to provide patients with constant temperature and humidity high-flow oxygen inhalation method. It is commonly used for moderate hypoxemia and can also be used for non-intubation intravenous anesthesia.

[0003] During high-flow oxygen therapy, there is a slight obstruction to the patient's exhalation, which is prone to CO2 accumulation, and even life-threatening in severe cases. During high-flow oxygen therapy, the patient's blood gas CO2 needs to be monitored in time to detect the patient's condition in time. If the condition improves, switch to conventional oxygen inhalation; if the condition worsens, switch to non-invasive or invasive mechanical ventilation.

[0004] Existing high-flow nasal oxygen cannulas cannot use a CO2 monitor to non-invasively collect and monitor the patient's end-tidal CO2 in real time. The condition can only be determined by collecting arterial blood for blood gas analysis, which increases the patient's pain and medical expenses. It also cannot be monitored continuously, delaying the diagnosis of the condition.

[0005] There is an urgent need in clinical practice for a high-flow nasal oxygen cannula that can continuously collect exhaled gas samples from patients and monitor the patients' end-tidal CO2 in real time. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a CO2 collection high-flow nasal oxygen tube, including a nasal oxygen chamber for supplying oxygen in the nasal cavity, a fixing belt for fixing the nasal oxygen chamber at the front position of the upper lip and nose, and a respiratory connection tube for connecting the nasal oxygen chamber with the oxygen supply port pipeline of a high-flow respiratory humidification oxygen therapy device, and the nasal oxygen chamber is connected to an intranasal tube for supplying oxygen to the nasal cavity. The nasal oxygen chamber is provided with a CO2 collection tube cavity corresponding to the position of the nostril, the inner cavity of the CO2 collection tube cavity is adapted to be provided with a CO2 collection tube, the tail end of the CO2 collection tube extends out of the CO2 collection tube cavity to provide a CO2 collection interface, and the head end of the CO2 collection tube extends through the CO2 collection tube cavity into the patient's nasal cavity.

[0007] The CO2 collection tube cavity is arranged corresponding to the intranasal tube, and the head side part of the tube wall of the CO2 collection tube is movably contained in the CO2 collection tube cavity and the intranasal tube, and the CO2 collection tube extends from the CO2 collection tube cavity into the patient's nasal cavity through the intranasal tube.

[0008] The head end of the CO2 collection tube is configured as a hollow tube;

[0009] Or, the head end of the CO2 collection tube is made of water-blocking and breathable material;

[0010] Alternatively, the head end of the CO2 collection tube is configured as a hollow tube and is wrapped with a water-blocking and air-permeable layer.

[0011] The outer side wall of the CO2 collection tube is provided with a super-slip coating; or, the CO2 collection tube is made of super-slip material.

[0012] The CO2 collection tube is provided with a limit block at a distance of 50-10 mm from the head end, and the limit block is located outside the CO2 collection tube cavity and away from the nasal oxygen cavity.

[0013] The CO2 collection tube is connected to a dryer, and water-absorbing particles are arranged in the dryer.

[0014] The tail of the CO2 collection tube cavity is provided with a sealing cap with a hole, and a perforation adapted to the CO2 collection tube is provided in the middle of the sealing cap with a hole; the tail of the CO2 collection tube cavity is rotatably sealed, and a flexible gasket adapted to the CO2 collection tube is provided at the bottom of the sealing cap with a hole; the CO2 collection tube passes through the perforation of the sealing cap with a hole and the flexible gasket and enters the CO2 collection tube cavity;

[0015] The sealing cap with holes is screwed tightly onto the tail end of the CO2 collection tube cavity, and the flexible gasket is compressed and elastically deformed to clamp the CO2 collection tube; the sealing cap with holes is screwed loose onto the tail end of the CO2 collection tube cavity, and the flexible gasket is restored to its original state, and the CO2 collection tube is released.

[0016] The CO2 collection high-flow nasal oxygen tube is used as follows:

[0017] S1; Wear the high-flow nasal oxygen cannula correctly and start high-flow oxygen inhalation; connect the end of the CO2 collection tube to the monitor correctly;

[0018] S2: slowly insert the tip of the CO2 collection tube into the nasal cavity through the CO2 collection tube lumen; at the same time, observe the CO2 value and waveform displayed on the monitor; fix the CO2 collection tube until the CO2 value displayed on the monitor is stable and the waveform is normal;

[0019] S3: When the oxygen gas flow rate of high-flow therapy is increased, loosen the CO2 collection tube and repeat S2.

[0020] Beneficial effects of the present invention:

[0021] 1. Realize continuous dynamic monitoring of end-tidal CO2 during high-flow oxygen inhalation and timely judge the patient's condition;

[0022] 2. Reduce the need for regular invasive blood gas checks during high-flow oxygen inhalation, reduce costs, and reduce pain;

[0023] 3. The anti-clogging design at the head end prevents mucus from entering the CO2 collection tube and causing monitoring interruption, and has good use effect;

[0024] 4. Simple structure, low cost and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a schematic diagram of the structure of the present invention before use;

[0026] Figure 2 It is a schematic diagram of the structure of the present invention in use;

[0027] Figure 3 It is a partial cross-sectional schematic diagram when the present invention is implemented;

[0028] Figure 4 This is a schematic diagram of the present invention after the CO2 collection tube is removed.

[0029] In the figure,

[0030] 1. Nasal oxygen chamber; 11. Intranasal tube; 12. CO2 collection tube lumen; 13. CO2 collection tube; 14. CO2 collection interface; 15. Limit block; 16. Dryer; 2. Fixing belt; 3. Breathing connection tube. DETAILED DESCRIPTION

[0031] In order to make the technical solution of the present invention better understood by the technical personnel in the field, and to make the above-mentioned features, purposes and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the embodiments. The embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0032] The CO2 collection high-flow nasal oxygen tube of the present invention includes a nasal oxygen chamber 1 for supplying oxygen in the nasal cavity, a fixing belt 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 the oxygen supply port pipeline of the high-flow respiratory humidification oxygen therapy device, and the nasal oxygen chamber 1 is connected to the intranasal tube 11 for supplying oxygen to the nasal cavity. This is the basic structure of the existing high-flow nasal oxygen tube. In actual use, the breathing connection tube 3 is connected to the high-flow respiratory humidification oxygen therapy device through the breathing pipeline, the fixing belt 2 fixes the nasal oxygen chamber 1 at the front position of the upper lip and nose of the patient, and the free end of the intranasal tube 11 is placed in the nasal cavity of the patient. The high-flow respiratory humidification oxygen therapy device heats and humidifies the 20-100L / min high-flow oxygen-rich airflow, and then releases it into the patient's nasal cavity at a high speed through the free end of the nasal tube 11. Due to the small space of the nasal cavity, a gas positive pressure of 2-7cmH2O is formed locally in the nasal cavity, which is similar to the PEEP breathing mode of the ventilator. When the patient inhales slightly, a large amount of gas flows into the patient's lungs, which is conducive to the full expansion of the alveoli and oxygenation. However, it is slightly disadvantageous for the patient's exhalation, which can easily lead to the inability to fully discharge CO2 in the body during exhalation, resulting in CO2 accumulation in the blood and risks. Therefore, it is extremely important to monitor the CO2 in the patient's exhaled gas when the patient is undergoing high-flow oxygen therapy, so as to promptly detect changes in the patient's respiratory condition, thereby terminating the high-flow oxygen therapy and switching to ordinary oxygen or mechanical ventilation.

[0033] In order to realize end-tidal CO2 monitoring during high-flow oxygen inhalation therapy, the nasal oxygen chamber 1 is provided with a CO2 collection lumen 12 corresponding to the position of the nostril; the inner cavity of the CO2 collection lumen 12 is adapted to be provided with a CO2 collection tube 13; the tail end of the CO2 collection tube 13 extends out of the CO2 collection lumen 12 and a CO2 collection interface 14 is provided outside the CO2 collection lumen 12; the head end of the CO2 collection tube 13 extends through the CO2 collection lumen 12 into the patient's nasal cavity.

[0034] The CO2 collection lumen 12 can be arranged adjacent to and in parallel with the intranasal tube 11, and the CO2 collection lumen 12 is located outside the intranasal tube 11. When in use, the CO2 collection tube 13 is in parallel with the intranasal tube 11 in the CO2 collection lumen 12, and part of the tube body of the CO2 collection tube 13 and the intranasal tube 11 are simultaneously contained in the shallow part of the nasal cavity. After the CO2 collection tube 13 exits the CO2 collection lumen 12, it exceeds the length of the intranasal tube 11 and extends into the nasal cavity by 30-70 mm.

[0035] Of course, if Figure 1 , Figure 2 and Figure 3 As shown, a better solution is that the CO2 collection tube cavity 12 is connected to the nasal tube 11, and the CO2 collection tube cavity 12 is set corresponding to the nasal tube 11. When in use, the CO2 collection tube 13 enters the nasal tube 11 through the CO2 collection tube cavity 12, and part of the tube body of the CO2 collection tube 13 is wrapped in the nasal tube 11, and the nasal tube 11 is located in the shallow part of the nasal cavity; the CO2 collection tube 13 extends into the nasal cavity 30-70mm after exiting the nasal tube 11.

[0036] The basic function of the CO2 collection lumen 12 is to contain the CO2 collection tube 13, and to guide the CO2 collection tube 13 into the deep nasal cavity of the patient, or even into the nasopharyngeal cavity when it is inserted. The CO2 collection lumen 12 can be set corresponding to the left nasal tube 11, or it can be set corresponding to the right nasal tube 11, and the CO2 collection tube 13 enters the corresponding nasal cavity when it is inserted. The CO2 collection lumen 12 can be set corresponding to the left and right bilateral nasal tubes 11. When in use, one side of the CO2 collection lumen 12 is selected to insert the CO2 collection tube 13 into the corresponding nasal cavity. In specific implementation, the diameter of the CO2 collection tube 13 is optimally 1.5-3mm, which can ensure the normal operation of the CO2 collection tube 13. When the CO2 collection tube 13 is located inside the nasal tube 11, it does not block the nasal tube 11, and can ensure high-flow oxygen supply; when the CO2 collection tube 13 is located outside the nasal tube 11, it will not block the nasal cavity, ensuring that the nasal cavity is unobstructed.

[0037] The collection principle is: patients who use high-flow nasal oxygen cannula to breathe oxygen retain their own breathing. When exhaling, patients overcome the slight gas pressure of high-flow oxygen inhalation and exhale through the nostrils. In the shallow part of the nasal cavity, the airflow is inevitably disturbed by the airflow released by the high-flow nasal tube 11. If the sampling is in the shallow part of the nasal cavity, it is inevitable that it will be inaccurate. When the product of the present invention is used, the end of the CO2 collection tube 13 extends through the CO2 collection tube cavity 12 into the deeper part of the patient's nasal cavity, with a depth of 50-70mm being the best. It can avoid the interference of high-flow oxygen inhalation airflow on the exhaled gas sample, accurately collect the patient's exhaled gas sample, and also reduce the insertion depth to avoid excessive depth, resulting in unnecessary discomfort and damage.

[0038] For further reference, Figure 1 , Figure 2 and Figure 3 As shown, the CO2 collection lumen 12 is arranged corresponding to the intranasal tube 11, and the head side part of the tube wall of the CO2 collection tube 13 is movably contained in the CO2 collection lumen 12 and the intranasal tube 11; the CO2 collection tube 13 is extended into the patient's nasal cavity through the CO2 collection lumen 12 and the intranasal tube 11. At the beginning of high-flow oxygen inhalation therapy, the head end of the CO2 collection tube 13 is contained in the collection lumen 12 and the intranasal tube 11, and does not enter the deep part of the nasal cavity, thereby alleviating the patient's discomfort. When it is necessary to monitor the patient's exhaled gas CO2 in real time, the CO2 collection tube 13 is inserted through the CO2 collection lumen 12, and after the head end extends out of the intranasal tube 11 and enters the deep part of the nasal cavity to an appropriate depth, the CO2 partial pressure of the patient's exhaled gas can be monitored in real time.

[0039] This design is most practical for patients under intravenous anesthesia. There is no need to monitor the end-tidal CO2 before anesthesia, and the head of the CO2 collection tube 13 does not need to enter the nasal cavity. When high-flow oxygen inhalation is turned on and anesthesia is started, respiratory depression of varying degrees is very likely to occur during anesthesia. At this time, the head of the CO2 collection tube 13 is placed deep in the nasal cavity, and the patient's respiratory state can be monitored while high-flow oxygen inhalation is connected to the monitor. When respiratory depression is severe (no CO2 waveform, apnea), or CO2 accumulates severely in the patient's body (end-tidal CO2 partial pressure is greater than 60mmHg), timely intervention measures are taken to avoid the serious consequences caused by this. After anesthesia, the patient has no discomfort when the CO2 collection tube 13 is placed deep in the nasal cavity. After the patient wakes up, the CO2 collection tube 13 is pulled out, and the patient has no adverse feelings throughout the process. In ordinary awake patients, the CO2 collection tube 13 is placed deep in the nasal cavity, and the patient is slightly uncomfortable, but can tolerate it.

[0040] When monitoring the end-tidal CO2 partial pressure, the patient's exhaled gas enters the CO2 monitor analysis module through the CO2 collection tube 13 under the suction of the weak negative pressure pump of the CO2 monitor. Mucus in the nasal cavity can easily enter and block the inner cavity of the CO2 collection tube 13. In order to reduce or avoid blockage, the head end of the CO2 collection tube 13 is further configured as a hollow tube; the hollow head end of the CO2 collection tube 13 increases the passage for the sampled gas to enter the CO2 collection tube 13, further reduces the negative pressure of the sampled gas entering the head end of the CO2 collection tube 13, and reduces the probability of mucus in the nasal cavity entering and blocking the inner cavity of the CO2 collection tube 13.

[0041] Or, the head end of the CO2 collection tube 13 is made of water-blocking and breathable material; the characteristic of water-blocking and breathable material is that gas can pass freely, but liquid cannot pass, thereby preventing mucus from entering and affecting the sampled gas from entering the CO2 collection tube 13, thereby completely avoiding blockage of the inner cavity of the CO2 collection tube 13. Unless all the heads of the CO2 collection tube 13 made of water-blocking and breathable materials are covered with mucus, a new head end of the CO2 collection tube 13 needs to be replaced.

[0042] Alternatively, the head end of the CO2 collection tube 13 is set as a hollow tube and is covered with a water-blocking and breathable layer. The head end of the CO2 collection tube 13 made of water-blocking and breathable materials and the CO2 collection tube 13 on the rear side are made of different materials, and the connection and fixing contact area is small, which may cause the risk of falling off deep in the nasal cavity during use. By changing to a hollow tube covered with a water-blocking and breathable layer, the bonding contact area between the water-blocking and breathable layer and the head end of the CO2 collection tube 13 is greatly increased, thereby avoiding this risk.

[0043] Furthermore, the outer wall of the CO2 collection tube 13 is provided with a super-slip coating; or the CO2 collection tube 13 is made of super-slip material. This structure can reduce the friction of the CO2 collection tube 13 on the nasal mucosa when it is inserted into the nasal cavity, thereby reducing discomfort and damage during insertion.

[0044] Furthermore, the CO2 collection tube 13 is provided with a limit block 15 at a distance of 50-10mm from the head end, and the limit block 15 is located outside the CO2 collection tube cavity 12 and away from the nasal oxygen cavity 1. The limit block 15 can be set as a transfer interface in the middle of the CO2 collection tube 13, and then a longer CO2 collection tube 13 is connected to the back, and finally connected to the monitor; it can also be set separately on the outer wall 50-10mm away from the head end of the CO2 collection tube 13, which prevents the CO2 collection tube 13 from being inserted too deep into the nasal cavity, causing unnecessary discomfort and increasing the risk of damage to the patient's nasal mucosa. At the same time, if the CO2 collection tube 13 inserted into the nasal cavity is too long, it will inevitably cause bending, which is more likely to cause the CO2 collection tube 13 pipeline to be blocked.

[0045] Furthermore, a dryer 16 is connected to the CO2 collection tube 13, and water-absorbing particles are arranged in the dryer. During high-flow oxygen inhalation therapy, the gas is heated and humidified gas, which is rich in water vapor. The water vapor condenses in the CO2 collection tube 13 to produce water droplets, which easily clog the CO2 collection tube 13. The water-absorbing particles in the dryer 16 can remove the water vapor in the sampled gas and extend the use time of the CO2 collection tube 13. The dryer 16 is temporarily fixed in the CO2 collection tube 13. When the dryer 16 inhales enough water vapor and fails, it can be replaced with a new dryer 16 for continued use.

[0046] When the patient's breathing is stable, the condition is improving, and end-tidal CO2 monitoring is not required, refer to Figure 4 , the CO2 collection tube 13 can be removed and the CO2 collection tube cavity 12 can be sealed to obtain a product with the same function as the existing high-flow nasal oxygen tube. Of course, the CO2 collection tube 13 can also be retracted, and the nasal tube 11 can enter and remain in the CO2 collection tube cavity 12 to obtain a product as shown in the figure. Figure 1 The CO2 collection tube 13 is kept in the CO2 collection tube cavity 12 for standby use, and is reconnected to the monitor when needed to monitor the end-tidal CO2 when the patient is inhaling high-flow oxygen.

[0047] It should be noted that, when the product of the present invention is used, in order to prevent the CO2 collection tube 13 from collecting the patient's exhaled gas sample and not being disturbed by the high-flow oxygen inhalation airflow, the depth at which the CO2 collection tube 13 is placed in the nasal cavity is closely related to the gas flow rate of the high-flow oxygen inhalation. Mainly: the depth at which the high-flow gas overcomes the patient's exhalation pressure and rushes into the nasal cavity during exhalation is positively correlated with the high-flow gas flow rate. The greater the high-flow gas flow rate, the greater the pressure generated when it is released in the nasal cavity, and the deeper the high-flow airflow enters the nasal cavity during exhalation. Only when the depth of the head end of the CO2 collection tube 13 collecting the gas sample exceeds the part of the nasal cavity disturbed by the high-flow gas, can it be ensured that the gas sample collected by the CO2 collection tube 13 is pure, and is the gas exhaled from the patient's lungs, rather than a mixture of the patient's exhaled gas in the lungs and the high-flow gas.

[0048] In order to ensure that the CO2 collection tube 13 collects pure samples of the patient's exhaled gas, the correct way to use it is: wear the high-flow nasal oxygen cannula correctly to start high-flow oxygen inhalation, and then insert the CO2 collection tube 13 into the nasal cavity through the CO2 collection tube cavity 12, and insert it slowly. At the beginning, the tip of the CO2 collection tube 13 that collects the gas sample enters the nasal cavity at a shallow depth, and the collected gas sample is pure high-flow gas or a mixture of the patient's lung exhaled gas and high-flow gas. At this time, the CO2 value displayed on the monitor is significantly low, the waveform is abnormal, or even there is no waveform; continue to insert the CO2 collection tube 13 into the nasal cavity. At this time, the high-flow gas interferes less with the patient's lung exhaled gas, and the content of the lung exhaled gas in the gas sample collected by the CO2 collection tube 13 begins to increase, and the CO2 value on the monitor begins to The CO2 waveform begins to return to normal; continue to insert the tip of the CO2 collection tube 13 into the nasal cavity. When all the collection holes at the tip of the CO2 collection tube 13 exceed the part of the nasal cavity that is disturbed by high-flow gas, the gas sample collected by the CO2 collection tube 13 is pure exhaled gas from the lungs. At this time, the CO2 value on the monitor is the correct CO2 value of the patient's exhaled gas, and its CO2 waveform can accurately reflect the patient's breathing state. Then, stop inserting the CO2 collection tube 13 into the nasal cavity and continue high-flow oxygen therapy under continuous monitoring of end-tidal CO2. When the oxygen flow rate of high-flow oxygen therapy is increased, it is necessary to place the tip of the CO2 collection tube 13 deeper into the nasal cavity under the above method.

[0049] The usage of CO2 high-flow nasal oxygen cannula is summarized as follows:

[0050] S1; Wear the high-flow nasal oxygen cannula correctly and start high-flow oxygen inhalation; connect the end of the CO2 collection tube 13 to the monitor correctly;

[0051] S2; slowly insert the head of the CO2 collection tube 13 into the nasal cavity through the CO2 collection tube lumen 12; at the same time, observe the CO2 value and waveform displayed on the monitor; until the CO2 value displayed on the monitor is stable and the waveform is normal, fix the CO2 collection tube 13;

[0052] S3: When the oxygen inhalation gas flow rate of high-flow therapy is increased, release the CO2 collection tube 13 and repeat the S2 operation.

[0053] Furthermore, in order to facilitate the adjustment of the depth of the CO2 collection tube 13 inserted into the nasal cavity and temporarily fix the CO2 collection tube 13, a sealing cap with holes is provided at the tail end of the CO2 collection tube cavity 12, and a perforation is provided in the middle of the sealing cap with holes to match the CO2 collection tube 13. The tail end of the CO2 collection tube cavity 12 is rotated to seal, and a flexible gasket is provided at the bottom of the sealing cap with holes to match the CO2 collection tube 13. The CO2 collection tube 13 passes through the perforation of the sealing cap with holes and the flexible gasket to enter the CO2 collection tube cavity 12.

[0054] The perforated sealing cap is screwed on the tail end of the CO2 collection tube lumen 12, and the flexible gasket is compressed and elastically deformed to clamp the CO2 collection tube 13; the perforated sealing cap and the tail end of the CO2 collection tube lumen 12 are loosened, the flexible gasket is restored, and the CO2 collection tube 13 is released. This is a structure for temporarily fixing the epidural catheter and the syringe, which has been used clinically for a long time and will not be elaborated here.

[0055] In summary, the present invention sets a CO2 collection lumen 12 in communication with the corresponding intranasal tube 12, and contains a CO2 collection tube 13 in the CO2 collection lumen 12. When needed, the CO2 collection tube 13 is inserted deep into the nasal cavity to non-invasively monitor the patient's end-tidal CO2. A hollow structure or a water-blocking and breathable material is set in the CO2 collection tube 13 to reduce blockage of the CO2 collection tube 13. The structure is simple, the clinical value is great, and the practicability is extremely strong.

[0056] The above embodiments are merely illustrative of the principles and effects of this patent application, and are not intended to limit this patent application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A CO2 collection high-flow nasal oxygen tube, 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, and is characterized in that: The nasal oxygen chamber (1) is provided with a CO2 collection tube cavity (12) corresponding to the position of the nostril; the inner cavity of the CO2 collection tube cavity (12) is adapted to be provided with a CO2 collection tube (13); the tail end of the CO2 collection tube (13) extends out of the CO2 collection tube cavity (12) and a CO2 collection interface (14) is provided outside; the head end of the CO2 collection tube (13) extends through the CO2 collection tube cavity (12) and enters the nasal cavity of the patient.

2. The CO2 collection high-flow nasal oxygen cannula according to claim 1, characterized in that: The CO2 collection tube cavity (12) is arranged corresponding to the intranasal tube (11), and the head side part of the tube wall of the CO2 collection tube (13) is movably contained in the CO2 collection tube cavity (12) and the intranasal tube (11); the CO2 collection tube (13) exits the CO2 collection tube cavity (12) and extends into the patient's nasal cavity through the intranasal tube (11).

3. The CO2 collection high-flow nasal oxygen cannula according to claim 1, characterized in that: The head end of the CO2 collection tube (13) is configured as a hollow tube; Or, the head end of the CO2 collection tube (13) is made of a water-blocking and air-permeable material; Alternatively, the head end of the CO2 collection tube (13) is configured as a hollow tube and is wrapped with a water-blocking and air-permeable layer.

4. The CO2 collection high-flow nasal oxygen cannula according to claim 1, characterized in that: The outer wall of the CO2 collection tube (13) is provided with an ultra-slip coating; or, the CO2 collection tube (13) is made of an ultra-slip material.

5. The CO2 collection high-flow nasal oxygen cannula according to claim 1, characterized in that: The CO2 collection tube (13) is provided with a limit block (15) at a distance of 50-10 mm from the head end, and the limit block (15) is located outside the CO2 collection tube cavity (12) and on a side away from the nasal oxygen cavity (1).

6. The CO2 collection high-flow nasal oxygen cannula according to claim 1, characterized in that: The CO2 collection pipe (13) is connected to a dryer (16), and water-absorbing particles are arranged in the dryer.

7. The CO2 collection high-flow nasal oxygen cannula according to claim 1, characterized in that: The tail of the CO2 collection tube cavity (12) is provided with a sealing cap with a hole, and a perforation matching the CO2 collection tube (13) is provided in the middle of the sealing cap with a hole; the tail of the CO2 collection tube cavity (12) is rotatably sealed, and a flexible gasket matching the CO2 collection tube (13) is provided at the bottom of the sealing cap with a hole; the CO2 collection tube (13) passes through the perforation of the sealing cap with a hole and the flexible gasket and enters the CO2 collection tube cavity (12); The perforated sealing cap and the tail end of the CO2 collection tube cavity (12) are screwed together, and the flexible gasket is compressed and elastically deformed to clamp the CO2 collection tube (13); the perforated sealing cap and the tail end of the CO2 collection tube cavity (12) are loosened, and the flexible gasket is restored to its original state, and the CO2 collection tube (13) is released. 8.CO2 collection high flow nasal oxygen tube, its use method is: S1; Wear the high-flow nasal oxygen cannula correctly and start high-flow oxygen inhalation; connect the end of the CO2 collection tube 13 to the monitor correctly; S2; slowly insert the tip of the CO2 collection tube 13 into the nasal cavity through the CO2 collection tube lumen 12; At the same time, observe the CO2 value and waveform displayed on the monitor; until the CO2 value displayed on the monitor is stable and the waveform is normal, fix the CO2 collection tube 13; S3: When the oxygen inhalation gas flow rate of high-flow therapy is increased, release the CO2 collection tube 13 and repeat the S2 operation.

Images