Adjustable end tidal carbon dioxide collection nasal oxygen cannula

Abstract

The application discloses a regulating end tidal carbon dioxide collection nasal oxygen tube, which comprises an oxygen inhalation nasal anterior chamber and a belt, one side of the oxygen inhalation nasal anterior chamber is communicated with an oxygen supply pipe, two flexible intranasal tubes are arranged in correspondence with two nostrils of the oxygen inhalation nasal anterior chamber, an end tidal collection regulating pipe is arranged in the oxygen inhalation nasal anterior chamber in correspondence with one of the flexible intranasal tubes, and an end tidal collection pipe is arranged in correspondence with the other side of the flexible intranasal tube and penetrates the wall of the oxygen inhalation nasal anterior chamber; the end tidal collection regulating pipe is advanced, the head end of the end tidal collection regulating pipe is sealed and communicated with the flexible intranasal tube in correspondence, single-nostril collection of end tidal gas for monitoring respiratory function and oxygen inhalation through the other nostril are realized, the end tidal collection regulating pipe is retreated, double-nostril oxygen inhalation is realized, the structure is simple, operation is convenient, the end tidal carbon dioxide collection nasal oxygen tube is suitable for clinical ordinary and high-flow oxygen inhalation and continuous or intermittent monitoring of respiratory function of patients, and is safe and reliable.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and more specifically, relates to an adjustable end-tidal carbon dioxide collection nasal oxygen tube. Background Technology

[0002] In clinical intensive care, surgical anesthesia, and postoperative resuscitation scenarios, simultaneous monitoring of oxygen administration and end-tidal carbon dioxide is a key diagnostic and treatment method for assessing patients' ventilation function. Meanwhile, high-flow oxygen therapy is of significant value in the treatment of hypoxemia.

[0003] High-flow oxygen therapy for monitoring end-tidal carbon dioxide is simple and practical, but existing patents and products have significant drawbacks: either the end-tidal gas collection tube needs to be inserted deep into the nasal cavity, making it very easy to be blocked by sputum and difficult to maintain; or it can only be used for oxygen inhalation in one nostril and end-tidal gas collection in the other nostril, which cannot be used for oxygen inhalation in both nostrils, seriously affecting the treatment effect in emergency hypoxia.

[0004] There is an urgent clinical need for a product that allows for single-nostril oxygen administration and accurate collection of end-expiratory gas from the other nostril during low-to-medium flow high-flow oxygen therapy (20-40 L / min), and dual-nostril oxygen administration during higher flow high-flow oxygen therapy (>40 L / min) to address emergency hypoxia needs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an adjustable end-tidal carbon dioxide collection nasal oxygen tube to solve the problems mentioned in the background section.

[0006] The adjustable end-tidal carbon dioxide collection nasal oxygen cannula includes an inhalation nasal cavity and a band, with the inhalation nasal cavity connected to an oxygen supply tube. The inhalation nasal cavity is preferably made of soft silicone or PVC material for comfortable wear; the oxygen supply tube is preferably a PVC tube with an inner diameter of 2-4 mm.

[0007] The oxygen inhalation anterior nasal cavity is connected to the two nostrils by two flexible nasal tubes. One of the flexible nasal tubes is equipped with an end-expiratory sampling adjustment tube in the oxygen inhalation anterior nasal cavity. The end-expiratory sampling adjustment tube is sealed and penetrates the side wall of the oxygen inhalation anterior nasal cavity relative to the flexible nasal tube and is connected to the end-expiratory sampling tube. The oxygen inhalation anterior nasal cavity forms a through-hole that matches the end-expiratory sampling adjustment tube at the penetration point. Advance the end-expiratory collection adjustment tube, and the corresponding flexible nasal tube is sealed and connected to the tip of the end-expiratory collection adjustment tube. At the same time, the corresponding flexible nasal tube is isolated from the anterior nasal cavity for oxygen inhalation. Retract the end-expiratory collection adjustment tube, and the tip of the end-expiratory collection adjustment tube leaves the corresponding flexible nasal tube, and the corresponding nasal tube is connected to the anterior nasal cavity for oxygen inhalation.

[0008] More preferably, a guide tube matching the outer diameter of the end-expiratory collection and adjustment tube is provided at the through-hole of the oxygen inhalation anterior nasal cavity corresponding to the end-expiratory collection and adjustment tube. The long axes of the guide tube and the end-expiratory collection and adjustment tube are in the same direction, pointing to the center of the opening at the root of the corresponding flexible nasal tube.

[0009] More preferably, the end-tidal collection and adjustment tube tip is provided with an inverted conical plug tip, and a corresponding inverted conical notch is provided at the root of the flexible nasal tube.

[0010] More preferably, the end-tidal collection adjustment tube is provided with a first retaining protrusion ring at the adapter part, and correspondingly, the guide tube is provided with an annular groove that matches the first retaining protrusion ring. As the end-tidal collection and adjustment tube is advanced, the plugging tube head seals and supports the inverted conical notch of the corresponding flexible nasal tube; simultaneously, the first retaining protrusion is correspondingly held in the annular groove.

[0011] More preferably, the end-tidal collection adjustment tube adapter is provided with a second retaining protrusion of the same shape and size as the first retaining protrusion, and the second retaining protrusion is located below the first retaining protrusion and close to the plugging tube head; The end-tidal collection and adjustment tube is retracted, with the head and tail of the blocking tube tightly against the inner wall of the anterior nasal cavity during oxygen inhalation; simultaneously, the second retaining protrusion is correspondingly retained in the annular groove.

[0012] More preferably, the end-tidal collection and adjustment tube is positioned with a positioning handle located outside the prenasal cavity during oxygen inhalation.

[0013] Even better, a matching sealing cap is provided at the tail end of the end-tidal collection tube.

[0014] The adjustable end-tidal carbon dioxide collection nasal oxygen tube provided by this invention has the following beneficial effects: The end-expiratory collection adjustment tube is used in conjunction with the corresponding flexible nasal tube. Under normal conditions, when oxygen is inhaled at a rate of 1-40 L / min, oxygen is inhaled through one nostril while the other nostril collects end-expiratory gas. In emergency situations, when oxygen is inhaled at a rate of >40 L / min, oxygen is inhaled through both nostrils. The inverted conical plug tip is matched with the inverted conical notch of the flexible nasal tube to achieve a tight seal and prevent oxygen from mixing into the exhaled gas sample collection. The alternating engagement of the first retaining protrusion and the second retaining protrusion with the annular groove ensures the product's functional stability and air circuit sealing during use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall invention; Figure 2 This is a schematic diagram of the anterior nasal cavity for oxygen inhalation according to the present invention; Figure 3 for Figure 2 The front view; Figure 4 for Figure 2 A cross-sectional view of the BB (a schematic diagram of the structure when oxygen is inhaled through both nostrils). Figure 5 for Figure 4 Enlarged sectional view of a portion of region A in the middle; Figure 6 for Figure 2 A cross-sectional view of the BB profile (a schematic diagram of a structure for oxygen inhalation through one nostril and end-expiratory gas collection through the other nostril). Figure 7 for Figure 6 Enlarged sectional view of region B in the middle.

[0016] In the picture: 1. Nasal cavity for oxygen inhalation; 11. Flexible nasal cannula; 12. Guiding tube; 13. Circular groove; 2. End-expiratory collection adjustment tube; 21. Plug tip; 22. First retaining protrusion ring; 23. Second retaining protrusion ring; 24. Positioning handle; 3. End-expiratory collection tube. Detailed Implementation

[0017] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0018] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Please see Figure 1-3 , Figure 4 and Figure 6As shown, this invention provides a technical solution: the adjustable end-tidal carbon dioxide collection nasal oxygen cannula of this invention includes an anterior nasal cavity 1 for oxygen inhalation and a strap, wherein the anterior nasal cavity 1 is connected to an oxygen supply tube. The anterior nasal cavity 1 is fixed in the anterior nasal region by the strap, and the anterior nasal cavity 1 is connected to the oxygen supply tube, which is connected to an oxygen source to supply oxygen to the patient. The anterior nasal cavity for oxygen inhalation is preferably made of soft silicone or PVC material for comfortable wear. The oxygen supply tube is preferably a PVC tube with an inner diameter of 2-4 mm.

[0021] The oxygen inhalation anterior nasal cavity 1 is connected to the nostrils by two flexible nasal tubes 11. When the oxygen inhalation anterior nasal cavity 1 is worn and fixed in the anterior nasal area, the two flexible nasal tubes 11 are respectively located in the two nasal cavities of the patient.

[0022] One of the flexible nasal tubes 11 is provided with an end-expiratory sampling adjustment tube 2 within the prenasal cavity 1 for oxygen inhalation. The end-expiratory sampling adjustment tube 2 is preferably made of a medical material of suitable rigidity, including tubing made of PVC, PE, etc. The end-expiratory sampling adjustment tube 2 is sealed through the side wall of the prenasal cavity 1 relative to the flexible nasal tube 11 and is connected to an end-expiratory sampling tube 3. Normally, the end-expiratory sampling adjustment tube 2 is separate from the corresponding flexible nasal tube 11, which is connected to the oxygen supply tube through the prenasal cavity 1 to provide oxygen to the patient.

[0023] When needed, adjust the end-tidal sampling adjustment tube 2 to seal and connect it with the corresponding flexible nasal tube 11, isolating it from the prenasal cavity 1 for oxygen inhalation; connect the corresponding flexible nasal tube 11 → end-tidal sampling adjustment tube 2 → end-tidal sampling tube 3 to the carbon dioxide sampling and analysis monitor to provide the patient with end-tidal gas sampling and monitoring of carbon dioxide partial pressure. The other flexible nasal tube 11 can only provide oxygen inhalation function.

[0024] The prenasal cavity 1 for oxygen inhalation forms a through-hole corresponding to the end-expiratory sampling and adjustment tube 2. By applying force, the end-expiratory sampling and adjustment tube 2 can be operated outside the through-hole, allowing it to move forward or backward within the through-hole, thus sealing or separating it from the corresponding flexible intranasal tube 11. The end-expiratory sampling and adjustment tube 2 is appropriately and tightly fitted to the through-hole of the prenasal cavity 1 for oxygen inhalation, maintaining a gas seal between the end-expiratory sampling and adjustment tube 2 and the inner wall of the through-hole of the prenasal cavity 1 for oxygen inhalation, and reducing oxygen leakage from the prenasal cavity 1 through the through-hole.

[0025] When administering oxygen through both nostrils, retract the end-expiratory sampling adjustment tube 2. The tip of the end-expiratory sampling adjustment tube 2 will move away from the corresponding flexible intranasal tube 11, which will then connect with the prenasal cavity 1 for oxygen administration. When collecting end-expiratory gas, advance the end-expiratory sampling adjustment tube 2. The corresponding flexible intranasal tube 11 will then be sealed and connected to the tip of the end-expiratory sampling adjustment tube 2, while simultaneously isolating it from the prenasal cavity 1 for oxygen administration. The specific usage instructions are as follows: When the patient is inhaling oxygen normally (including low, medium and high flow rates, with an oxygen flow rate of 0-100 L / min), the end-expiratory collection adjustment tube 2 is pulled back outside the through-hole of the oxygen inhalation anterior nasal cavity 1 until the tip of the end-expiratory collection adjustment tube 2 is far away from the root opening of the corresponding flexible intranasal tube 11. The root opening of the flexible intranasal tube 11 is fully connected with the oxygen inhalation anterior nasal cavity 1. The oxygen source gas is released from the oxygen supply tube through the oxygen inhalation anterior nasal cavity 1 and from the two flexible intranasal tubes 11 into the patient's two nasal cavities, thereby enabling the patient to inhale oxygen through both nostrils.

[0026] When end-tidal carbon dioxide monitoring is required, the end-tidal collection and adjustment tube 2 is advanced outside the penetration opening of the prenasal cavity 1 for oxygen inhalation until its tip rests against the root opening of the corresponding flexible intranasal tube 11. The outer periphery of the tip of the end-tidal collection and adjustment tube 2 forms a seal with the inner wall of the root opening of the corresponding flexible intranasal tube 11, thus communicating with the inner lumen of the flexible intranasal tube 11. This isolates the flexible intranasal tube 11 from the prenasal cavity 1 for oxygen inhalation, forming an expiratory gas collection pathway that connects to the end-tidal collection tube 3. During exhalation, under the negative pressure of the end-tidal carbon dioxide monitor, the exhaled gas enters the gas analysis module of the end-tidal carbon dioxide monitor through the corresponding flexible intranasal tube 11 → end-tidal collection and adjustment tube 2 → end-tidal collection tube 3, thereby analyzing and displaying the partial pressure of carbon dioxide in the patient's exhaled gas and assessing the patient's respiratory status. At this time, another flexible nasal tube 11 is connected to the oxygen supply tube via the oxygen inhalation anterior nasal cavity 1. The oxygen source gas is released into the patient's other nasal cavity via the oxygen supply tube → oxygen inhalation anterior nasal cavity 1 → another flexible nasal tube 11, providing oxygen to the patient. Simultaneously, it escapes from the corresponding nostril through the other flexible nasal tube 11, forming a high-concentration oxygen area in front of the nasal cavity, providing a lower concentration of oxygen to the corresponding carbon dioxide collection nasal cavity of the patient.

[0027] It should be noted that when the end-expiratory collection regulating tube 2 is positioned close to the corresponding flexible nasal tube 11, the outer diameter of the end-expiratory collection regulating tube 2 should be smaller than the transverse diameter of the longitudinal section of the oxygen inhalation anterior nasal cavity 1. This ensures that when the end-expiratory collection regulating tube 2 is positioned against the corresponding flexible nasal tube 11, the longitudinal shape of the end-expiratory collection regulating tube 2 is much smaller than the inner cavity of the oxygen inhalation anterior nasal cavity 1. This allows oxygen to flow smoothly through the inner cavity of the oxygen inhalation anterior nasal cavity 1 on the side of the end-expiratory collection regulating tube 2 into the flexible nasal tube 11, which is far from the oxygen supply tube, thereby providing oxygen to the patient.

[0028] Better, such as Figure 4-7 As shown, a guide tube 12 matching the outer diameter of the end-expiratory collection and adjustment tube 2 is provided at the through-hole of the oxygen inhalation anterior nasal cavity 1 corresponding to the end-expiratory collection and adjustment tube 2. The long axes of the guide tube 12 and the end-expiratory collection and adjustment tube 2 are in the same direction, pointing to the center of the opening at the root of the corresponding flexible nasal tube 11.

[0029] Under the guidance of the matching guide tube 12, the end-expiratory collection adjustment tube 2 is advanced outside the penetration opening of the anterior nasal cavity 1 during oxygen inhalation, preventing excessive deviation of the end-expiratory collection adjustment tube 2 and ensuring that it advances in direct correspondence with the root opening of the flexible nasal tube 11. When the tip of the end-expiratory collection adjustment tube 2 rests against the root opening of the corresponding flexible nasal tube 11, the central axis of the end-expiratory collection adjustment tube 2 and the root opening of the flexible nasal tube 11 are accurately aligned without significant deviation. This allows the tube wall of the end-expiratory collection adjustment tube 2 to rest against the inner wall or outer periphery of the flexible nasal tube 11, forming a sealed connection between the end-expiratory collection adjustment tube 2 and the inner cavity of the flexible nasal tube 11.

[0030] Better, such as Figure 4-7 As shown, the end-tidal collection and adjustment tube 2 is provided with an inverted conical plug head 21 at its tip, and a corresponding inverted conical notch is provided at the root of the flexible nasal tube 11. The maximum outer diameter of the plugging tip 21 at the end of the end-tidal sampling regulating tube 2 is greater than the minimum inner diameter of the inverted conical notch at the root of the flexible nasal tube 11; the minimum outer diameter of the plugging tip 21 at the end of the end-tidal sampling regulating tube 2 is less than the maximum inner diameter of the inverted conical notch at the root of the flexible nasal tube 11; this allows the plugging tip 21 of the end-tidal sampling regulating tube 2 to smoothly enter the notch at the root of the flexible nasal tube 11, which is also inverted conical; under the matching effect of any angle of the inverted conical (original frustum-shaped) shape, when the plugging tip 21 of the end-tidal sampling regulating tube 2 is held in the inverted conical notch at the root of the flexible nasal tube 11, the outer conical surface of the plugging tip 21 and the inner conical surface of the inverted conical notch have a high degree of matching, a soft and hard fit, and a large contact surface, which easily forms a sealed connection, reducing the leakage of oxygen from the prenasal cavity 1 into the end-tidal sampling regulating tube 2 through this contact surface, and diluting the carbon dioxide content in the end-tidal gas sample.

[0031] Better, such as Figure 6-7 As shown, the end-tidal collection adjustment tube 2 is provided with a first retaining protrusion 22 at the adapter part, and correspondingly, the guide tube 12 is provided with an annular groove 13 that is adapted to the first retaining protrusion 22; when the end-tidal collection adjustment tube 2 is pushed forward, the plugging tube head 21 seals and supports the inverted conical notch of the corresponding flexible nasal tube 11, and at the same time, the first retaining protrusion 22 is correspondingly held in the annular groove 13.

[0032] When end-expiratory gas collection is required, the end-expiratory collection adjustment tube 2 is advanced. When the plug tube head 21 seals against the inverted conical notch of the corresponding flexible nasal tube 11, the first retaining protrusion 22 is correspondingly held in the annular groove 13, forming a temporary fixing effect on the end-expiratory collection adjustment tube 2, maintaining the tightness of the plug tube head 21 against the inverted conical notch of the corresponding flexible nasal tube 11, and ensuring the sealing of the contact surface between the two; at the same time, the position of the end-expiratory collection adjustment tube 2 is temporarily fixed to prevent the end-expiratory collection adjustment tube 2 from moving backward after the operation is completed and the plug tube head 21 is released, thereby preventing the inverted conical notch of the corresponding flexible nasal tube 11 from loosening, and preventing oxygen in the anterior nasal cavity 1 during oxygen inhalation from entering the end-expiratory collection adjustment tube 2 and diluting the gas sample collected at the end of the exhalation.

[0033] The nasal cavity 1 for oxygen inhalation is made of a soft medical material (silicone is best), and the guide tube 12 is integrally molded from the same material, possessing strong elasticity; the end-tidal collection adjustment tube 2 is made of a rigid medical material. Under external force, the end-tidal collection adjustment tube 2 is advanced, and the annular first retaining protrusion 22 expands the inner cavity of the guide tube 12 until the first retaining protrusion 22 enters the annular groove 13 and forms a fixed position. At this point, the plug head 21 is tightly fitted and held against the inverted conical recess of the flexible nasal tube 11. The first retaining protrusion 22 of the end-tidal collection adjustment tube 2 is slightly larger than the annular groove 13 within the guide tube 12. When the two are relatively fixed, the first retaining protrusion 22 and the annular groove 13 are in tight contact, forming a sealing effect on the outer wall of the end-tidal collection adjustment tube 2 and the inner wall of the guide tube 12.

[0034] Better, such as Figure 4-5 As shown, the end-tidal collection adjustment tube 2 is provided with a second retaining protrusion 23 of the same shape and size as the first retaining protrusion 22, and the second retaining protrusion is located below the first retaining protrusion and close to the blocking tube head 21; when the end-tidal collection adjustment tube 2 is retracted, the tail of the blocking tube head 21 is in close contact with the inner wall of the anterior nasal cavity 1 for oxygen inhalation, and the second retaining protrusion 23 is correspondingly retained in the annular groove 13.

[0035] Similarly, when the end-tidal collection adjustment tube 2 is pulled back by external force, the annular second retaining protrusion 23 expands the inner cavity of the guide tube 12 until the second retaining protrusion 23 enters the annular groove 13 to form a fixed position. At this point, the tail of the blocking tube head 21 is tightly attached to the inner wall of the oxygen inhalation anterior nasal cavity 1, and the blocking tube head 21 is far away from the root opening of the corresponding flexible nasal tube 11, so that the oxygen inhalation anterior nasal cavity 1 is connected to the root opening of the corresponding flexible nasal tube 11, thereby entering the structural state of oxygen inhalation through both nostrils. The second retaining protrusion 23 is slightly larger than the annular groove 13 provided inside the guide tube 12. When the two are relatively fixed, it prevents the end-expiratory collection adjustment tube 2 from moving forward and obstructing the oxygen in the prenasal cavity 1 from entering the corresponding flexible nasal tube 11. At the same time, the second retaining protrusion 23 and the annular groove 13 are in tight contact, forming a sealing effect on the outer wall of the end-expiratory collection adjustment tube 2 and the inner wall of the guide tube 12, preventing oxygen leakage from the prenasal cavity 1 through the gap between the outer wall of the end-expiratory collection adjustment tube 2 and the inner wall of the guide tube 12 during oxygen inhalation.

[0036] Better, such as Figure 1-2 As shown, the end-tidal collection adjustment tube 2 is positioned with a positioning handle 24 outside the prenasal cavity 1 for oxygen inhalation; the positioning handle 24 facilitates the forward or backward operation of the end-tidal collection adjustment tube 2.

[0037] Better, such as Figure 1-2 , Figure 4 and Figure 6 As shown, a matching sealing cap is provided at the tail of the end-expiratory collection tube 3. When oxygen is being inhaled through both nostrils, the end-expiratory collection regulating tube 2 and the end-expiratory collection tube 3 are idle. Oxygen in the anterior nasal cavity 1 will inevitably leak through the end-expiratory collection regulating tube 2 and the end-expiratory collection tube 3. The sealing cap seals the opening at the tail of the end-expiratory collection tube 3, thereby preventing oxygen leakage.

[0038] In summary, this invention, through the design of the end-expiratory collection regulating tube 2 and the corresponding flexible nasal tube 11, allows for single-nostril oxygen inhalation while collecting end-expiratory gas from the other nostril during oxygen inhalation at 1-40 L / min under normal conditions; when not necessary, it can provide full-flow oxygen inhalation through both nostrils (1-100 L / min) in real time; the inverted conical plug head 21 and the inverted conical recess of the flexible nasal tube 11 ensure a tight seal; and the cooperation of the first retaining protrusion ring 22, the second retaining protrusion ring 23, and the annular groove 13 ensures functional stability and airway sealing during product use.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable end-tidal carbon dioxide collection nasal oxygen cannula, characterized in that: It includes an oxygen inhalation nasal cavity (1) and a band, wherein the oxygen inhalation nasal cavity (1) is connected to an oxygen supply tube; The oxygen inhalation anterior nasal cavity (1) is connected to the two nostrils by two flexible nasal tubes (11), and an end-expiratory collection adjustment tube (2) is provided in the oxygen inhalation anterior nasal cavity (1) for one of the flexible nasal tubes (11); the end-expiratory collection adjustment tube (2) is sealed and penetrates the side wall of the oxygen inhalation anterior nasal cavity (1) relative to the flexible nasal tube (11) and is connected to an end-expiratory collection tube (3); the oxygen inhalation anterior nasal cavity (1) forms a penetration opening that matches the end-expiratory collection adjustment tube (2) at the penetration part of the end-expiratory collection adjustment tube (2); Advance the end-expiratory collection adjustment tube (2), and the corresponding flexible nasal tube (11) is sealed and connected to the tip of the end-expiratory collection adjustment tube (2), while the corresponding flexible nasal tube (11) is simultaneously isolated from the oxygen inhalation anterior nasal cavity (1); retract the end-expiratory collection adjustment tube (2), and the tip of the end-expiratory collection adjustment tube (2) leaves the corresponding flexible nasal tube (11), while the corresponding flexible nasal tube (11) is connected to the oxygen inhalation anterior nasal cavity (1).

2. The adjustable end-tidal carbon dioxide collection nasal oxygen cannula according to claim 1, characterized in that: In the nasal cavity (1) of oxygen inhalation, a guide tube (12) matching the outer diameter of the end-expiratory collection and adjustment tube (2) is set at the through-hole. The long axis of the guide tube (12) and the end-expiratory collection and adjustment tube (2) are in the same direction, pointing to the center of the opening at the root of the corresponding flexible nasal tube (11).

3. The adjustable end-tidal carbon dioxide collection nasal oxygen cannula according to claim 2, characterized in that: The end-tidal collection adjustment tube (2) is provided with an inverted cone-shaped plug (21) at the head end, and a corresponding inverted cone-shaped notch is provided at the root of the flexible nasal tube (11).

4. The adjustable end-tidal carbon dioxide collection nasal oxygen cannula according to claim 3, characterized in that: The end-tidal collection adjustment tube (2) is provided with a first retaining protrusion ring (22) at the fitting part, and the guide tube (12) is provided with an annular groove (13) that is adapted to the first retaining protrusion ring (22). When the end-tidal collection adjustment tube (2) is advanced, the plugging tube head (21) seals and holds the inverted conical notch of the corresponding flexible nasal tube (11); at the same time, the first holding protrusion (22) is correspondingly held in the annular groove (13).

5. The adjustable end-tidal carbon dioxide collection nasal oxygen cannula according to claim 3, characterized in that: The end-tidal collection adjustment tube (2) is provided with a second retaining protrusion (23) of the same shape and size as the first retaining protrusion (22). The second retaining protrusion (23) is located below the first retaining protrusion (22) and close to the plugging tube head (21). The end-tidal collection adjustment tube (2) is retracted, and the tail of the plug tube head (21) is pressed against the inner wall of the nasal cavity (1) for oxygen inhalation; at the same time, the second retaining protrusion (23) is correspondingly retained in the annular groove (13).

6. The adjustable end-tidal carbon dioxide collection nasal oxygen cannula according to claim 3, characterized in that: The end-expiratory collection adjustment tube (2) is positioned with a positioning handle (24) outside the prenasal cavity (1) for oxygen inhalation.

7. The adjustable end-tidal carbon dioxide collection nasal oxygen cannula according to claim 1, characterized in that: The end-tidal collection tube (3) is equipped with a matching sealing cap at its tail.

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