Nasal plug assembly, nasal oxygen cannula and ventilation treatment equipment

Abstract

The utility model provides a rhinobyon assembly, nasal oxygen tube and ventilation treatment equipment, relates to medical instrument technical field, rhinobyon assembly includes rhinobyon main part and a pair of nasal fork tube, the rhinobyon main part is used for being connected with the intake tube, the pair of tubular nasal fork is connected with one side of the rhinobyon main part at interval so as to be communicated with the intake tube through the rhinobyon main part, the nasal plug assembly is characterized in that the nasal plug assembly is used for an open type air path, air resistance pieces are arranged on the two nasal fork tubes, and the air resistance pieces protrude in the radial direction of the nasal fork tubes and are used for blocking overflowing air between the nasal fork tubes and the nostrils of a wearer when the nasal plug assembly is worn. The nasal oxygen cannula comprises the nasal plug assembly. The ventilation treatment equipment comprises the nasal oxygen cannula. The air pressure change in a breathing loop between the expiration stage and the inspiration stage of a patient can be increased, the distinguishing capacity of the equipment for the breathing stage of the patient is improved, more accurate air supply control is achieved, more comfortable high-flow humidifying oxygen therapy experience is provided for the patient, and air is saved to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to nasal plug components, nasal oxygen tubes, and ventilation therapy equipment. Background Technology

[0002] High-flow nasal cannula oxygen therapy (HFNC) is a method of oxygen therapy that continuously provides patients with a high flow rate of oxygen gas through a nasal cannula, with adjustable and relatively constant oxygen concentration, temperature, and humidity.

[0003] Currently, some HFNC devices have a mode that switches the output gas flow rate between the patient's inhalation and exhalation based on the patient's respiratory phase; this will be referred to as Smartflow mode below. In Smartflow mode or similar modes, doctors or other users pre-set the inhalation and expiration flow rates. When the patient inhales, the HFNC device outputs a higher flow rate of gas, and when the patient exhales, the HFNC device outputs a lower flow rate of gas. This provides a more comfortable treatment experience for the patient while conserving oxygen and other gas resources.

[0004] However, existing HFNC devices have low accuracy in distinguishing the patient's breathing phase, making it difficult to accurately coordinate with the patient's breathing to provide gas delivery at different flow rates. Utility Model Content

[0005] The purpose of this invention is to provide a nasal plug assembly, a nasal oxygen tube, and a ventilation therapy device. It addresses the shortcomings of existing technologies by providing a solution that increases the pressure change in the breathing circuit between the patient's exhalation and inhalation phases, thereby improving the device's ability to distinguish the patient's breathing phase. When used in conjunction with high-flow humidified oxygen therapy devices, it can better implement different ventilation strategies during the patient's exhalation and inhalation, thus providing the patient with a more comfortable high-flow humidified oxygen therapy experience and saving gas usage to a certain extent.

[0006] The technical solution adopted in this utility model is as follows:

[0007] This application provides a nasal plug assembly, including a nasal plug body and a pair of nasal forks. The nasal plug body is used to connect to an air inlet pipe. The pair of tubular nasal forks are connected to one side of the nasal plug body at intervals to allow communication with the air inlet pipe through the nasal plug body. The nasal plug assembly is used for an open air passage. Air blocking elements are provided on both nasal forks. The air blocking elements protrude radially along the nasal forks to block overflow gas between the nasal forks and the wearer's nostrils when worn.

[0008] Furthermore, in some embodiments of this utility model, the air-resistance element is located below the wearer's nostrils; or,

[0009] The air-blocking element is located inside the wearer's nostril, and the sum of the widths of the air-blocking element and the nose fork tube in the radial direction of the nose fork tube is less than the width of the wearer's nostril, so that the air-blocking element is separated from the inner surface of the wearer's nostril.

[0010] Furthermore, in some embodiments of the present invention, the air resistance element includes at least: a portion located on the side of one nose fork tube away from the other nose fork tube, and protruding radially along the nose fork tube; and the width of the protrusion of the air resistance element towards the side closer to the other nose fork tube is zero, or less than the width of the protrusion of the air resistance element away from the other nose fork tube.

[0011] Furthermore, in some embodiments of this utility model, the circumferentially closed nose fork tube, and the air resistance element is disposed on the outer wall of the nose fork tube; or,

[0012] The air-blocking element has an inner cavity, and the inner cavity of the air-blocking element is in communication with the inner cavity of the nose fork tube.

[0013] Furthermore, in some embodiments of this utility model, the air resistance element and the nose fork tube are integrally formed components; or, the air resistance element and the nose fork tube are detachably connected.

[0014] Furthermore, in some embodiments of this utility model, the air resistance element includes a protrusion located on the side of the pair of nose forks that are far apart from each other.

[0015] Furthermore, in some embodiments of this utility model, the thickness of the air resistance element in the axial direction of the nose fork tube is 0.2mm-4mm; and / or, the sum of the widths of the air resistance element and the nose fork tube in the radial direction of the nose fork tube is 2mm-10mm.

[0016] Furthermore, in some embodiments of this utility model, the air resistance element includes a baffle structure extending radially along the nose fork tube, the baffle structure being located at one end of the nose fork tube near the nose plug body.

[0017] Furthermore, in some embodiments of this utility model, the baffle structure satisfies at least one of the following conditions:

[0018] The thickness of the baffle structure along the axial direction of the nose fork tube is 0.1mm-1.5mm;

[0019] The area of ​​the baffle structure on the side away from the nasal plug body is 2mm. 2 -64mm 2 ;

[0020] The included angle between the baffle structure and the axial direction of the nose fork tube is 80°-100°.

[0021] Furthermore, in some embodiments of this invention, the two baffle structures on the pair of nose forks are separated from each other; or,

[0022] The two baffle structures on the pair of nasal forks are connected to each other by a connecting part, and the connecting part is recessed toward the nasal plug body.

[0023] Furthermore, in some embodiments of this utility model, the baffle structure is detachably sleeved onto the nose fork tube.

[0024] Furthermore, in some embodiments of this utility model, the air resistance element includes a folding and telescopic structure that can be folded and extended along the axial direction of the nose tube;

[0025] The air-resistance element is configured such that, when in use, it extends when the wearer inhales and folds when the wearer exhales.

[0026] Furthermore, in some embodiments of this utility model, the folding telescopic structure includes at least one folding unit, the folding unit being a tube and communicating with the inner cavity of the nose fork tube, the tube being folded into a shape that gradually narrows from the middle to both ends, and the maximum outer diameter of the folding telescopic structure when folded is greater than the outer diameter of the nose fork tube.

[0027] Furthermore, in some embodiments of this utility model, the air resistance element includes a multi-layered folded unit, which is stacked along the axial direction of the nose fork tube; or, the multi-layered folded unit is spirally stacked around the axial direction of the nose fork tube.

[0028] Furthermore, in some embodiments of this utility model, the folding telescopic structure satisfies at least one of the following conditions:

[0029] The width of the folding telescopic structure when extended is 2mm-8.5mm;

[0030] The width of the folding telescopic structure when folded is 2.5mm-10mm;

[0031] When the folding telescopic structure is extended, the total length of the nose fork tube is 5mm-15mm.

[0032] When the folding telescopic structure is folded, its total length with the nose tube is 4mm-14mm.

[0033] This application also provides a nasal oxygen tube, including the nasal plug assembly as described in any of the above embodiments.

[0034] This application also provides a ventilation therapy device, which includes the nasal oxygen tube described above.

[0035] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0036] The nasal plug assembly provided in this embodiment is for an open airway. By providing air-blocking elements on each of the pair of nasal forks, with the elements protruding radially along the nasal forks, it blocks overflow gas between the nasal fork and the wearer's nostrils during wear. This results in a greater air resistance during the expiratory phase than during the inspiratory phase. When the gas flow rate, density, and viscosity remain constant, a higher air resistance generally leads to higher air pressure within the tubing, thus increasing the pressure variation in the respiratory circuit between the patient's expiratory and inspiratory phases and improving the device's ability to distinguish the patient's respiratory stage. When used in conjunction with high-flow humidified breathing equipment, it enables more precise gas supply control, allowing for better implementation of different ventilation strategies during the patient's exhalation and inhalation, providing a more comfortable high-flow humidified oxygen therapy experience, and conserving gas usage to some extent. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the nasal oxygen tube provided by the present invention, which includes the nasal plug assembly of Embodiment 1.

[0039] Figure 2 A front view of the nasal plug assembly provided in the first embodiment of this utility model;

[0040] Figure 3 A side view of the nasal plug assembly provided in the first embodiment of this utility model;

[0041] Figure 4 A front view of the nasal plug assembly provided in the first embodiment of this utility model;

[0042] Figure 5 A side view of the nasal plug assembly provided in the second embodiment of this utility model;

[0043] Figure 6 A side view of the nasal plug assembly provided in the second embodiment of this utility model;

[0044] Figure 7 A front view of the nasal plug assembly provided in the second embodiment of this utility model;

[0045] Figure 8 A side view of the nasal plug assembly provided in the second embodiment of this utility model;

[0046] Figure 9 A schematic diagram of the air resistance component of the nasal plug assembly provided in the second embodiment of this utility model during disassembly;

[0047] Figure 10 A schematic diagram comparing the diameter of the hole in the air-blocking component with the diameter of the root of the nose fork tube provided in the second embodiment of this utility model;

[0048] Figure 11 A side view of the nasal plug assembly provided in the third embodiment of this utility model;

[0049] Figure 12 A cross-sectional view of the nasal plug assembly provided in the third embodiment of this utility model;

[0050] Figure 13 A comparison diagram of the width of the nose fork in the extended and folded states provided in the third embodiment of this utility model;

[0051] Figure 14 A comparison diagram of the length of the nose fork in the extended and folded states provided in the third embodiment of this utility model;

[0052] Figure 15 A schematic diagram of the nasal oxygen tube provided by the present invention, which includes the nasal plug assembly of Embodiment 3.

[0053] Figure 16 A schematic diagram of the ventilation therapy device provided by this utility model;

[0054] Figure 17 A partial schematic diagram of the patient's inspiratory phase in an existing nasal oxygen tube breathing circuit provided by this utility model;

[0055] Figure 18 A partial schematic diagram of the patient's exhalation phase in an existing nasal oxygen tube breathing circuit provided by this utility model;

[0056] Figure 19 A partial schematic diagram of the nasal oxygen tube breathing circuit of embodiment 1 or 2 provided for this utility model during the patient's inhalation phase;

[0057] Figure 20 A partial schematic diagram of the nasal oxygen tube breathing circuit during the patient's exhalation phase in Embodiment 1 or 2 of this utility model;

[0058] Figure 21A partial schematic diagram of the nasal oxygen tube breathing circuit during the patient's inhalation phase in Embodiment 3 of this utility model;

[0059] Figure 22 This is a partial schematic diagram of the nasal oxygen tube breathing circuit during the patient's exhalation phase in Embodiment 3 of this utility model.

[0060] Icons: 1-Nasal oxygen cannula; 11-Nasal oxygen cannula tubing; 12-Nasal oxygen cannula tubing interface; 13-Bandage connecting fastener; 14-Headband strap; 15-Clip; 2-Nasal plug assembly; 21-Nasal plug body; 22-Nasal fork tube; 23-Tube interface; 24-Air resistance element; 25-Connection part; 3-Oxygen supply system; 31-Oxygen interface; 32-Oxygen connection tubing; 4-Air-oxygen mixing device; 41-Air-oxygen mixer; 42-Filter screen; 43-Fan; 44-Sensor; 5-Humidification therapy device; 51-Water tank; 52-Heating base plate; 53-Overflow prevention valve; 54-Water supply tank; 55-Drip pot; 56-Infusion tubing; 6-Breathing tubing; 71-Nasal fork tube; 72-Patient breathing gas passage; 73-Patient exhaust gas passage. Detailed Implementation

[0061] The inventors of this application, through analysis of existing technologies, discovered that current HFNC (High-Pressure Noise Cancellation) devices primarily detect gas flow and pressure within the breathing circuit using sensors. During ventilation therapy, the HFNC device can determine the patient's respiratory stage based on the pressure readings collected by the sensors, and then adjust the device's output accordingly for more precise gas supply control. However, HFNC is an open, non-positive pressure ventilation system. The treatment method involves delivering warm, humidified breathing gas through a nasal cannula to the patient's nostrils. A key characteristic of HFNC is the need to maintain a certain gap between the nasal cannula and the nostrils (the nostril area is typically twice the cross-sectional area of ​​the nasal fork), creating an open airway at the patient's end. This results in minimal pressure changes during exhalation and inhalation, making the pressure detected by the sensors less significant and hindering the determination of the patient's respiratory stage. Consequently, it cannot accurately deliver gas according to the patient's needs.

[0062] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0063] like Figures 1-15 As shown, this application designs a nasal plug assembly and a nasal oxygen tube including the nasal plug assembly. On the nasal fork tube 22 of the nasal plug assembly 2, an air resistance element 24 is added that protrudes radially along the nasal fork tube 22 to block the overflow gas between the nasal fork tube 22 and the wearer's nostrils when worn, so as to increase the air resistance of the nasal plug assembly 2 at least in the expiratory circuit, so that the air pressure change in the breathing circuit between the patient's exhalation and inhalation stages is more obvious.

[0064] It is understood that the nasal plug assembly 2 provided in this application embodiment maintains a radially protruding state along the nasal fork 22 at least when the wearer exhales, so as to block the overflow gas including the gas exhaled by the wearer between the nasal fork 22 and the wearer's nostrils when worn, thereby making the circuit air resistance in the exhalation phase greater than the circuit air resistance in the inhalation phase, thereby increasing the air pressure change in the respiratory circuit between the two phases of exhalation and inhalation.

[0065] In some embodiments of this utility model, the aforementioned air-blocking element 24 is located below the wearer's nostrils; for example, the air-blocking element can be a baffle structure that protrudes radially along the nasal fork tube 22. The baffle structure is plate-shaped and does not extend into the wearer's nostrils. Its area can be set to be larger than the area of ​​the nostrils. When worn, it is located below the wearer's nostrils and can block the overflow of gas between the nasal fork tube 22 and the wearer's nostrils. Figures 5-9 As shown. Alternatively, the airlock 24 is located inside the wearer's nostril, and the sum of the widths of the airlock 24 and the nasal fork 22 in the radial direction of the nasal fork 22 is less than the width of the wearer's nostril, so that the airlock 24 is separated from the inner surface of the wearer's nostril; for example, the airlock 24 can be a protrusion protruding radially along the nasal fork 22, which can be accommodated inside the wearer's nasal cavity; when it is located inside the wearer's nasal cavity, it needs to have a certain gap between it and the inner wall of the wearer's nasal cavity to avoid causing discomfort to the patient, such as Figures 2-4 As shown.

[0066] Understandably, if the width of the protrusion of the bump structure or the folded telescopic structure described below meets the requirements (e.g., to enable the sensor to detect changes in air pressure in the breathing circuit between the two phases of exhalation and inhalation), the bump or folded telescopic structure can also be set at the root of the nasal fork in a similar manner to the baffle structure, so that when the patient wears the nasal plug assembly, the bump or folded telescopic structure is located below the wearer's nostrils.

[0067] In some embodiments of this invention, the air-blocking member 24 includes at least a portion located on the side of one of the nose forks 22 away from the other nose fork 22, and protruding radially along the nose fork 22. Furthermore, the width of the protrusion of the air-blocking member 24 towards the side closer to the other nose fork 22 is zero, i.e., the air-blocking member 24 only protrudes towards the side of the two nose forks 22 that is away from each other; or, when the air-blocking member 24 includes a protruding portion located on the side of the pair of nose forks 22 that is close to each other, the width of the protrusion of the air-blocking member 24 towards the side closer to the other nose fork 22 (hereinafter referred to as the inner side of the nose fork) is smaller than the width of the protrusion of the air-blocking member 24 towards the side away from the other nose fork 22.

[0068] In related technologies, the inner side of the nasal fork 22 is generally close to the nasal septum, with a small gap between it and the inner wall of the nasal cavity. In this case, by placing at least the main body of the air-blocking element 24 on the side of the pair of nasal fork 22 that is far apart from each other, the air-blocking element 24 has a more significant effect in blocking overflowing gas; and by excluding the portion located inside the nasal fork 22 or setting the portion located inside the nasal fork 22 to have a smaller protrusion width, interference between the air-blocking element 24 and the nasal septum can be avoided.

[0069] In some embodiments of this utility model, the circumferentially closed nose fork tube 22, and the air-blocking element 24 is disposed on the outer wall of the nose fork tube 22, such as a solid, protruding air-blocking element, such as... Figures 2-9 As shown; or, the airlock 24 has an inner cavity, and the inner cavity of the airlock 24 communicates with the inner cavity of the nose fork tube 22, such as a tubular telescopic airlock, such as Figures 11-14 As shown. It is understood that in some embodiments, the protrusion structure or baffle structure may also communicate with the inner cavity of the nose fork tube 22; the tubular telescopic structure may not communicate with the inner cavity of the nose fork tube 22.

[0070] In some embodiments of this utility model, the air resistance element 24 and the nose fork tube 22 are integrally formed components; or, the air resistance element 24 and the nose fork tube 22 are detachably connected.

[0071] The following examples, with reference to the accompanying drawings, illustrate several more specific embodiments of nasal plug components with different structures.

[0072] Example 1:

[0073] See Figure 1 A schematic diagram of the nasal oxygen tube with the nasal plug assembly of Embodiment 1 provided by this utility model is shown below. Figures 2-4 This is a schematic diagram of the nasal plug assembly in Embodiment 1 of this utility model.

[0074] like Figure 2 The nasal plug assembly 2 includes a nasal plug body 21 and a pair of tubular nasal forks 22. One end of the nasal plug body 21 is provided with a tubing interface 23 for connection to an air intake pipe. The pair of tubular nasal forks 22 are connected to one side of the nasal plug body 21 at intervals, so that the air intake pipe can be connected through the nasal plug body 21. The air intake pipe is in Figure 1 The diagram shows the nasal oxygen tubing 11, which connects the nasal plug body 21 and the nasal fork tube 22 to deliver high-flow, high-humidity, and high-concentration oxygen to the patient, providing oxygen therapy.

[0075] Air resistance elements 24 are provided on both nasal cannulas 22 to block the overflow of gas between the nasal cannulas 22 and the wearer's nostrils when worn, increasing the air resistance of the entire breathing circuit. This makes the pressure change in the breathing circuit between the patient's exhalation and inhalation phases more obvious, so that the sensors inside the machine can collect whether the patient is in the exhalation or inhalation phase. This enables the HFNC device and similar ventilation therapy devices to accurately control the patient's respiratory gas demand, thereby providing the patient with a more comfortable high-flow humidified oxygen therapy experience and saving gas usage to a certain extent.

[0076] See Figure 2 and Figure 3 In some embodiments of this invention, the aforementioned air-blocking element 24 includes a protrusion disposed on the outer wall of the nasal fork 22 and protruding along the radial direction of the nasal fork 22, and the protrusion is located on the side of the pair of nasal fork 22 that are far apart from each other. In this way, while effectively blocking the overflowing gas, interference between the protrusion and the nasal septum is avoided.

[0077] In some embodiments, the thickness of the protrusion in the axial direction of the nasal fork tube 22 is less than the axial length of the nasal fork tube 22, so that it occupies only a small portion of the space when it is located in the patient's nasal cavity, thereby increasing air resistance without causing discomfort to the patient. Its specific length is preferably 0.2mm-4mm. The protrusion-type air resistance element 24 can be located on the lower outer side of the nasal fork tube 22 (close to the nostril and nasal ala), and has a certain gap with the top end of the nasal fork tube 22 on the side away from the nasal plug body 21.

[0078] The protrusion has a predetermined width in the radial direction of the nasal fork 22. This width is generally selected in conjunction with the size of the nasal oxygen cannula 1 it is fitted with, ensuring that the total width of the protrusion and the nasal fork 22 in the radial direction is less than twice the maximum outer diameter of the corresponding size nasal fork 22, or less than the diameter of the wearer's nostrils. This allows the protrusion-shaped air-resisting element 24 to be located inside the patient's nasal cavity when the patient wears the nasal plug assembly 2, occupying a portion of the space between the nasal fork 22 and the patient's nostrils, but minimizing contact with the nasal cavity. This increases the air resistance of the breathing circuit while allowing for overflow space. Specifically, the total width is preferably 2mm-10mm. It should be noted that, generally, the diameter of the nasal fork 22 is half the diameter of the wearer's nostrils. Therefore, when the total width of the air-resisting element 24 and the nasal fork 22 in the radial direction is less than twice the maximum outer diameter of the corresponding size nasal fork 22, it satisfies the requirement of being less than the diameter of the wearer's nostrils.

[0079] In some embodiments of this invention, the aforementioned air-blocking element 24 is made of a soft material, which can be the same material as the nasal plug body 21 and the nasal fork tube 22, and integrally formed with them. Specific materials may include, but are not limited to, silicone, soft polyvinyl chloride, TPE, TPU, EVA, POE, POP, PE, etc. The soft protrusion has a certain degree of flexibility, ensuring that it does not cause discomfort to the patient when worn inside the nasal cavity, thus improving patient comfort. In some embodiments, the protrusion-shaped air-blocking element 24 can also be detachably snapped onto the side wall of the nasal fork tube 22.

[0080] In some embodiments of this utility model, the aforementioned air resistance element 24 can be a rounded protrusion attached to the outside of the nose fork tube 22 (such as...). Figure 2 (as shown) or petal-shaped bumps (such as) Figure 4 (as shown); it can also be other protruding shapes set on the outside of the nasal fork 22, but its edges are kept to be rounded so that it will not damage the nasal mucosa when it is located in the nasal cavity.

[0081] Example 2:

[0082] See Figures 5-10 These are schematic diagrams of the nasal plug assembly in Embodiment 2 of this utility model.

[0083] The difference between this set of embodiments and Embodiment 1 is that the air-blocking element 24 in this set of embodiments is a baffle structure. For example, this baffle structure can extend along the outer side of the wearer's nose or along the outer side of the wearer's nose and in the direction directly in front of the face, where the direction directly in front of the wearer's face is the front of the face. The air-blocking element 24 of the baffle structure is located at one end of the nasal fork tube 22 near the nasal plug body 21. For example, the baffle structure can be located at the root of the nasal fork tube 22 or at the connection point with the nasal plug body 21, so that the baffle structure does not extend into the patient's nasal cavity when worn.

[0084] It should be noted that the difference between the air-blocking element 24 of the baffle structure and the protrusion-shaped air-blocking element 24 in Embodiment 1 is that the radial dimension of the protrusion structure in Embodiment 1 is comparable to its axial dimension in the nose fork tube 22, or even the axial dimension of the protrusion in the nose fork tube 22 is significantly larger than its radial dimension in the nose fork tube 22; in contrast, the radial dimension of the baffle structure in the nose fork tube 22 is significantly larger than its axial dimension in the nose fork tube 22. The two are positioned differently on the nose fork tube 22. When in use, the air-blocking element 24 of the baffle structure does not extend into the wearer's nostril, while the air-blocking element 24 of the protrusion structure needs to extend into the wearer's nostril.

[0085] See Figure 5 and Figure 6The baffle structure can be arc-shaped or fan-shaped, extending along the outer side of the wearer's nose or the outer side of the wearer's nose and in the direction directly facing the face, avoiding obstruction of the upper lip or nostrils downwards or upwards, with only a small amount or no separate protrusion near the upper lip. For example, the baffle structure can be a straight plate, which is basically perpendicular to the axis of the nasal fork 22; or, the portion of the baffle structure corresponding to the wearer's nostrils can be recessed towards the side closer to the nasal plug body 21.

[0086] In some embodiments of this invention, the thickness of the air-blocking element 24 of the baffle structure along the axial direction of the nasal fork tube 22 is preferably 0.1mm-1.5mm, to avoid the sheet-like protruding air-blocking element 24 being too thin and deformed significantly by airflow, or too thick and compressing the nostrils and upper lip. The area of ​​the air-blocking element 24 of the baffle structure on the side away from the nasal plug body 21 on a single nasal fork tube 22 is preferably 2mm². 2 -64mm 2 To avoid the situation where the area is too small to provide adequate air resistance, or too large to fold upwards or downwards and touch the nostrils and upper lip due to airflow, the angle between the baffle structure and the axial direction of the nasal fork tube 22 is preferably 80°-100°. This is to avoid the situation where an angle that is too large or too small may result in poor air resistance, or an angle that is too large may block the upper lip, or an angle that is too small may interfere with the nostrils.

[0087] See Figure 7 and Figure 8 In some embodiments of this utility model, the two baffle structures 24 on the pair of nasal fork tubes 22 can be separated from each other, i.e., they are separate structures. Alternatively, they can be designed as an integral connecting structure connected by a connecting part 25, forming an integral air resistance structure to further increase its area; and the connecting part 25 of the two baffle structures is recessed towards the nasal plug body 21 to avoid obstructing the patient's nasal septum when worn.

[0088] In some embodiments, the radial dimension of the connector 25 in the nose fork 22 may be less than twice the size of the protrusions of the single-sided baffle structure on the opposite side of the nose fork 22. Thus, for the airlock 24 corresponding to a single nose fork 22, the width of its protrusion towards the other nose fork 22 (e.g., half the radial dimension of the connector 25 in the nose fork 22) is less than the width of the protrusion of the airlock 24 away from the other nose fork 22.

[0089] See Figure 9In some embodiments of this utility model, the air-blocking component 24 of the baffle structure can be integrally formed with the nasal fork tube 22; or, the baffle structure can be designed as a detachable structure, which is detachably sleeved on the nasal fork tube 22. When needed, the air-blocking component 24 of the detachable baffle structure can be directly sleeved on the existing nasal fork tube 22, thereby realizing the utilization of the existing general nasal oxygen tube structure. Specifically, the diameter of the sleeve hole of the air-blocking component 24 of the baffle structure can be slightly smaller than the diameter of the end of the nasal fork tube 22 connected to the nasal plug tube, that is, the hole size of the baffle structure corresponds to the corresponding size of the nasal fork and is slightly smaller than its bottom diameter; so that when sleeved, after the sleeve hole of the baffle structure is inserted into the nasal fork tube 22, it squeezes the soft nasal fork tube 22 to a certain extent, and is sleeved on the root of the nasal fork tube 22 in an interference fit, so that the baffle structure can be stably sleeved on the root of the nasal fork tube 22 without falling off. Figure 10 As shown, the solid line represents the diameter of the bottom of the nasal fork 22, and the dashed line represents the diameter of the perforation of the air-resisting element 24 of the detachable baffle structure. When worn, the air-resisting element 24 of the baffle structure is inserted from above the nasal fork 22 to the bottom. After wearing, it is positioned below the patient's nostril but does not completely contact it. While allowing overflow space, it alters the flow direction of air exiting from the gap between the nasal fork 22 and the nostril from below, thereby hindering airflow and increasing the air resistance of the breathing circuit. The air-resisting element 24 of the baffle structure can also be snapped into an annular groove at the end of the nasal fork 22 near the nasal plug body 21.

[0090] In some embodiments of this utility model, since the air-blocking component 24 of the above-mentioned baffle structure does not need to be inserted into the patient's nostril, the above-mentioned material can be not only soft materials such as soft polyvinyl chloride, TPE, TPU, EVA, POE, POP, PE, etc., but also hard materials such as PE, PP and ABS.

[0091] Example 3:

[0092] See Figures 11-14 These are schematic diagrams of the nasal plug assembly in Embodiment 3 of this utility model.

[0093] The difference between this embodiment and Embodiments 1 and 2 is that the air-resisting element 24 in this embodiment is a foldable and telescopic structure that can be folded and extended along the axial direction of the nasal fork 22. When the wearer inhales, the air-resisting element 24 extends; when the wearer exhales, the air-resisting element 24 folds. This foldable and telescopic structure can be set in the middle section of the nasal fork 22 (the part between the two ends of the nasal fork) and extends into the nasal cavity when in use.

[0094] In some embodiments, the folding telescopic structure may communicate with the inner cavity of the nasal fork tube 22 and be integrally formed with the nasal fork tube 22; or, the folding telescopic structure may be detachably connected to the side wall of the nasal fork tube 22, and its inner cavity may not communicate with the inner cavity of the nasal fork tube 22.

[0095] In some embodiments of this utility model, the above-mentioned folding telescopic structure includes at least one folding unit, which is a tube and communicates with the inner cavity of the nasal fork tube. Together with the nasal fork tube 22, it constitutes a telescopic nasal fork tube 22. When the tube is folded, it has a shape that gradually narrows from the middle to both ends. Furthermore, the maximum outer diameter of the folding telescopic structure when folded is greater than the outer diameter of the nasal fork tube, so as to play a role in air resistance. The shape of the telescopic nasal fork tube 22 in its normal state is as follows: Figure 11 As shown. When the patient inhales, the airlock element 24 extends and unfolds, the length of the nasal fork 22 increases and returns to its normal state, and the width (maximum outer diameter) at the airlock element 24 decreases. At this time, the airlock element 24 has little or no effect on the air resistance in the breathing circuit. The corresponding cross-sectional views of the airlock element 24 and the nasal fork 22 are shown in the figure. Figure 12 As shown. When the patient exhales, the air resistance element 24 is compressed and folded, the overall length of the nasal fork 22 is shortened, and the maximum outer diameter of the air resistance element 24 is increased but still smaller than the diameter of the wearer's nostril, so as not to completely squeeze the nasal cavity. At this time, the air resistance element 24 occupies part of the gap between the nasal fork 22 and the nasal cavity, thereby leaving overflow space while increasing the air resistance of the breathing circuit.

[0096] This application Figures 11-14 The air-blocking element 24 is shown as a single-layer folded telescopic structure. In some other embodiments of this application, the air-blocking element may also include a multi-layer folded unit, which is stacked along the axial direction of the nose tube 22; or, the multi-layer folded unit is spirally stacked around the axial direction of the nose tube to form a compressible threaded structure.

[0097] In some embodiments of this invention, the maximum outer diameter of the air-resistance element 24 when extended is approximately equal to the outer diameter of the nasal fork tube 22. Here, "approximated" means identical or close to, meaning that the maximum diameter of the air-resistance element 24 when the patient inhales is close to the corresponding outer diameter of the nasal fork tube 22. In some embodiments, the width of the air-resistance element 24 when extended is preferably 2mm-8.5mm; the maximum outer diameter of the air-resistance element 24 when folded is greater than the outer diameter of the nasal fork tube 22. Specifically, the total width of the air-resistance element 24 and the nasal fork tube 22 in the radial direction is less than twice the maximum outer diameter of the corresponding size nasal fork tube 22, or the total width in the radial direction is less than the diameter of the wearer's nostril. That is, the maximum diameter when the patient exhales is close to but less than the diameter of the patient's nostril corresponding to the nasal fork tube 22 model. This ensures that when worn, the air-resistance element 24 is located inside the patient's nasal cavity, occupying part of the space between the nasal fork tube 22 and the patient's nostril, but minimizing contact with the patient's nasal cavity. This increases the air resistance of the breathing circuit while allowing for overflow space. Specifically, the width of the air-resistance element 24 when folded is preferably 2.5mm-10mm.

[0098] In some embodiments of this invention, the maximum length of the nasal fork 22 during patient exhalation is generally 4mm-14mm, meaning the total length of the nasal fork 22 is 4mm-14mm when the air-resisting element 24 is folded. The maximum length of the nasal fork 22 during patient inhalation is close to or slightly greater than its normal length, generally 5mm-15mm, meaning the total length of the nasal fork 22 is 5mm-15mm when the air-resisting element 24 is extended. A comparison of the width and length of the air-resisting element 24 and the nasal fork 22 during unfolding and compression is provided below. Figure 13 and Figure 14 As shown, Figure 13 In the middle, the top is the compressed state, and the bottom is the expanded state; Figure 14 In the image, the left side represents the compressed state, and the right side represents the expanded state.

[0099] The aforementioned air-blocking component 24 and the nose fork tube 22 can be integrally formed or connected and fixed to the middle section of the nose fork tube 22. Similar to Embodiment 1, the aforementioned air-blocking component 24 is made of a soft material, including but not limited to silicone, soft polyvinyl chloride, TPE, TPU, EVA, POE, POP, PE, etc.

[0100] See Figure 1 and Figure 15 This utility model embodiment also provides a nasal oxygen tube 1, which may include the nasal plug assembly 2 as described in Embodiments 1, 2, or 3 above, and an air inlet pipe connected to the nasal plug assembly 2 via a pipe interface 23. The air inlet pipe is the nasal oxygen tube line 11. On one side of the nasal plug body 21 of the nasal plug assembly 2, two left and right strap connecting buckles 13 are provided for connecting a headband 14. The headband 14 is used to wear the nasal oxygen tube 1 on the patient's head to fix the nasal oxygen tube 1. The nasal oxygen tube line 11 is connected to the pipe interface 23 of the nasal plug body 21. The end of the nasal oxygen tube line 11 away from the nasal plug body 21 is provided with a nasal oxygen tube line interface 12, which is used to connect to an oxygen supply device. A clip 15 is also provided at this interface for clamping and fixing.

[0101] See Figure 16 This utility model embodiment also provides a ventilation therapy device, which includes the above-mentioned nasal oxygen tube 1.

[0102] In some embodiments of this utility model, the ventilation therapy device is a humidified oxygen therapy device (HFNC system), including an oxygen supply system 3, an air-oxygen mixing device 4, and a humidification therapy device 5. The oxygen supply system 3, the air-oxygen mixing device 4, the humidification therapy device 5, and the nasal cannula 1 are connected sequentially via connecting pipes. Sensors 44 are arranged in the breathing circuit of the ventilation therapy device to measure one or more of the following: gas flow rate, air pressure, temperature, and humidity in the breathing circuit.

[0103] The aforementioned oxygen supply system 3 mainly consists of the oxygen interface 31 connecting to the oxygen terminal in the equipment, which serves as the oxygen source connecting the pipeline oxygen system and the HFNC system. The aforementioned air-oxygen mixing device 4 comprises an air-oxygen mixer 41, a filter 42, a fan 43, and a sensor 44. Oxygen is input into the air-oxygen mixing device 4 through the oxygen interface 31. The fan 43 introduces filtered air through the filter 42, mixing the oxygen and air in the air-oxygen mixer 41, and then outputting the mixed gas from the air-oxygen mixing device 4 to the humidification therapy device 5. The sensor 44 can also be located at the interface of the humidification oxygen therapy device or the interface of the oxygen connection pipeline 32, adjusting the relevant parameters by measuring parameters such as gas flow rate, pressure, temperature, or humidity in the breathing circuit and adjusting the speed of the fan 43. The aforementioned humidification therapy device 5 comprises a water storage tank 51, a heating base plate 52, and an overflow prevention valve 53. The humidifier 5 receives the input mixed gas and introduces it into the water tank 51. The water supply tank 54, via the drip chamber 55 and infusion line 56, supplies distilled water into the water tank 51. The heated water, heated by the base plate 52, evaporates into water vapor in the water tank 51, further mixing with the input mixed gas to complete the heating and humidification process. The output mixed gas is then transmitted to the nasal cannula 1 and inhaled by the patient. The air-oxygen mixing device 4 and the humidifier 5 are connected together on the floor to form the main body of the HFNC device. The aforementioned connecting lines, including the mixed breathing line 6 and the oxygen connection line 32, primarily facilitate gas transmission throughout the system.

[0104] See below Figures 17-22 This paper details the gas flow in the nasal fork 22 and the area near the patient's nostrils during HFNC treatment, using both existing nasal oxygen cannulas and the nasal oxygen cannulas 1 with air resistance element 24 provided in this application. When the HFNC device is operating, the nasal oxygen cannulas and the patient's surrounding environment include the nasal fork 71, the patient's breathing gas passage 72, and the patient's exhaust gas passage 73. The nasal fork 71 is provided by the nasal fork 22, and can be, for example, a channel for delivering a high-flow-rate mixed gas to the patient during HFNC. The patient's breathing gas passage 72 is the gas passage through which gas is drawn from the nasal cavity into the pharynx, larynx, and trachea to the lungs during inhalation and exhaled into the nose during exhalation. The patient's exhaust gas passage 73 is the gap between the nasal fork 22 and the patient's nostrils; all gas not inhaled by the patient and gas exhaled by the patient flows into the external environment through the patient's exhaust gas passage 73.

[0105] When a patient uses a commonly available nasal oxygen cannula, the flow of gas in the nasal fork 22 and the portion near the patient's nostrils, such as... Figure 17 and Figure 18As shown. During inhalation, a high-flow-rate gas mixture flows in through the nasal fork 71, opening the unidirectional passage from the patient's nasal cavity to the lungs. A portion of the high-flow-rate gas flows through the patient's respiratory pathway into the pharynx, larynx, trachea, and lungs. Gas exceeding the patient's tidal volume flows into the external environment through the gap between the nasal fork 22 and the patient's nostrils (i.e., the patient's exhaust gas passage 73). Figure 17 As shown; during the patient's exhalation, a high-flow-rate mixed gas flows in through the nasal fork tube 71, and the passage from the patient's nasal cavity to the lungs is closed in one direction. All the high-flow-rate gas that flows in, together with the waste gas expelled by the patient from the lungs to the nasal cavity, flows into the external environment through the gap between the nasal fork tube 22 and the patient's nostrils (i.e., the patient's exhalation gas passage 73), such as... Figure 18 As shown. During both inhalation and exhalation, the same amount of gas, exceeding the patient's tidal volume, flows into the external environment through the patient's exhaust gas passage 73. This part can be considered a branch with equivalent air resistance. In addition, during inhalation, the patient's tidal volume of gas is drawn into the lungs through the patient's breathing passage, and during exhalation, both the patient's waste gas and tidal volume of gas flow into the external environment through the exhaust gas passage. These two different circuits during inhalation and exhalation have similar air resistance in practical applications of HFNC. In summary, the overall air resistance of the breathing circuit during exhalation and inhalation is similar for the patient in HFNC. Assuming constant gas flow rate, density, and viscosity, Bernoulli's equation indicates that the greater the air resistance within the ventilation circuit, the greater the air pressure (or pressure drop) in order to maintain the same flow rate. Therefore, when the patient uses a standard nasal cannula for HFNC, the air pressure within the overall ventilation circuit during inhalation and exhalation is also similar, making it difficult for sensor 44 to accurately distinguish the respiratory stage.

[0106] When a patient uses the nasal oxygen cannula 1 of Examples 1 and 2, the flow of gas in the nasal fork 22 and the portion near the patient's nostrils is as follows: Figure 19 and Figure 20 As shown. During inhalation, a high-flow-rate mixed gas flows in through the nasal fork tube 71, opening the unidirectional passage from the patient's nasal cavity to the lungs. A portion of the high-flow-rate gas flows through the patient's respiratory pathway into the pharynx, larynx, trachea, and lungs. Gas exceeding the patient's tidal volume, after being blocked by the air-blocking element 24, flows into the external environment through the gap between the nasal fork tube 22 and the patient's nostrils (i.e., the patient's exhaust gas passage 73). Figure 19 As shown; during the patient's exhalation, a high-flow-rate mixed gas flows in through the nasal fork tube 71. The passage from the patient's nasal cavity to the lungs is closed in one direction. All the high-flow-rate gas that flows in, together with the waste gas expelled from the patient's lungs to the nasal cavity, flows into the external environment through the gap between the nasal fork tube 22 and the patient's nostrils (i.e., the patient's exhalation gas passage 73) after being blocked by the air resistance element 24. Figure 20 As shown.

[0107] Therefore, during inhalation and exhalation, the air resistance of the ventilation branch that flows from the patient's exhaust gas passage 73 into the external environment, exceeding the patient's tidal volume, remains the same. During inhalation, the air resistance and flow rate of the branch that carries the patient's tidal volume of gas into the patient's lungs through the patient's respiratory passage remain unchanged. During exhalation, the air resistance of the branch that carries both the patient's waste gas and the patient's tidal volume of gas into the external environment through the exhaust gas passage increases relatively due to the obstruction of the air resistance component 24. In summary, when a patient uses the nasal oxygen cannula 1 structure of this embodiment in HFNC, the expiratory air resistance is greater than the inspiratory air resistance. Under the condition that the gas flow rate, density, and viscosity remain constant, Bernoulli's equation shows that the greater the air resistance in the ventilation circuit, the greater the air pressure (or pressure drop) in the circuit will generally be. Therefore, when a patient uses the nasal oxygen cannula 1 of this embodiment for HFNC, the expiratory air pressure in the ventilation circuit is greater than the inspiratory air pressure, and the pressure difference between the two increases.

[0108] When a patient uses the nasal oxygen cannula 1 of Embodiment 3 of this application, the flow of gas in the nasal fork 22 and the portion near the patient's nostrils, as follows: Figure 21 and Figure 22 As shown. During inhalation, a high-flow-rate mixed gas flows in through the nasal fork 71, opening the unidirectional passage from the patient's nasal cavity to the lungs. A portion of the high-flow-rate gas flows through the patient's respiratory pathway into the pharynx, larynx, trachea, and lungs. At this time, the air resistance element 24 remains in its normal deployed state or is slightly elongated due to the influence of the gas flow rate inside and outside the nasal fork 22. Consequently, the length of the nasal fork 22 increases slightly, and the maximum diameter at the air resistance element 24 decreases to approximately the same as the outer diameter of the nasal fork 22. Gas exceeding the patient's tidal volume flows into the external environment with virtually no obstruction through the gap between the nasal fork 22 and the patient's nostrils (i.e., the patient's exhaust gas passage 73). Figure 21 As shown; during the patient's exhalation, a high-flow-rate mixed gas flows in through the nasal fork tube 71, and the passage from the patient's nasal cavity to the lungs is closed in one direction. All the high-flow-rate gas that flows in, along with the waste gas expelled from the patient's lungs to the nasal cavity, flows into the external environment through the gap between the nasal fork tube 22 and the patient's nostrils (i.e., the patient's exhalation gas passage 73). At this time, the flow rate in the gas passage increases and the air resistance increases, so the air resistance element 24 is compressed. The length of the nasal fork tube 22 is slightly shortened, and the maximum diameter at the air resistance element 24 increases, occupying part of the cross-sectional area of ​​the gas passage, further increasing the air resistance of the gas passage, such as... Figure 22 As shown.

[0109] Therefore, during inhalation, the air resistance of the breathing circuit using the nasal oxygen cannula 1 structure proposed in this embodiment is basically the same as that of the breathing circuit using a common nasal oxygen cannula 1. During exhalation, the air resistance of the patient's waste gas and tidal volume gas flowing into the external environment from the exhaust gas passage is relatively increased due to the obstruction of the air resistance component 24. In summary, the air resistance during exhalation is greater than the air resistance during inhalation in HFNC. Under the condition that the gas flow rate, density, and viscosity remain constant, Bernoulli's equation shows that the greater the air resistance in the ventilation circuit, the greater the air pressure (or pressure drop) in the circuit will generally be. Therefore, when the patient uses the nasal oxygen cannula 1 of this embodiment for HFNC, the air pressure in the ventilation circuit during exhalation is greater than that during inhalation, and the pressure difference between the two increases.

[0110] Therefore, in the HFNC system of various embodiments of this application, the more differentiated respiratory / inspiratory phase breathing circuit pressure can help the device more easily determine the patient's current respiratory stage. This allows for more precise and sensitive delivery of different flow rates of gas to the patient's respiratory stage, improving patient comfort while conserving gas usage.

[0111] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships and dimensional relationships mentioned, such as parallel, perpendicular, aligned, and consistent, are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0112] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A nasal plug assembly comprising a nasal plug body for connection with an air intake tube and a pair of tubular prongs connected to one side of the nasal plug body spaced apart from each other to enable communication of the air intake tube through the nasal plug body, characterised in that, The nasal plug assembly is used for an open airway, and air blocking members are arranged on both nasal prongs, and the air blocking members protrude in the radial direction of the nasal prongs to block overflow gas between the nasal prongs and the nostrils of a wearer when worn.

2. The nasal congestion assembly of claim 1, wherein, The air blocking member is located below the nostrils of the wearer; or The air blocking member is located in the nostrils of the wearer, and the sum of the width of the air blocking member and the width of the nasal prong in the radial direction of the nasal prong is less than the width of the nostrils of the wearer, so that the air blocking member is separated from the inner surface of the nostrils of the wearer.

3. The nasal congestion assembly of claim 1, wherein, The air blocking member at least includes a portion protruding in the radial direction of one of the nasal prongs away from the other nasal prong, and the protruding width of the air blocking member towards the other nasal prong is zero or less than the protruding width of the air blocking member away from the other nasal prong.

4. The nasal congestion assembly of claim 1, wherein, The circumferential direction of the nasal prong is closed, and the air blocking member is arranged on the outer wall of the nasal prong; or The air blocking member has an inner cavity, and the inner cavity of the air blocking member communicates with the inner cavity of the nasal prong.

5. The nasal congestion assembly of claim 1, wherein, The air blocking member and the nasal prong are an integrally formed component; or the air blocking member and the nasal prong are detachably connected.

6. The nasal congestion assembly of any one of claims 1-5, wherein, The air blocking member includes a protruding block located on the side away from each other of the pair of nasal prongs.

7. The nasal congestion assembly of claim 6, wherein, The thickness of the air blocking member in the axial direction of the nasal prong is 0.2mm-4mm; and / or the sum of the width of the air blocking member and the width of the nasal prong in the radial direction of the nasal prong is 2mm-10mm.

8. The nasal congestion assembly of any one of claims 1-5, wherein, The air blocking member includes a baffle structure extending in the radial direction of the nasal prong, and the baffle structure is located at one end of the nasal prong close to the nasal plug body.

9. The nasal congestion assembly of claim 8, wherein, The baffle structure satisfies at least one of the following conditions: The thickness of the baffle structure in the axial direction of the nasal prong is 0.1mm-1.5mm; The area of the side of the baffle structure away from the nasal plug body is 2mm 2 - 64mm 2 ; The included angle between the baffle structure and the axial direction of the nasal prong is 80°-100°.

10. The nasal congestion assembly of claim 8, wherein, The two baffle structures on the pair of nasal prongs are separated from each other; or The two baffle structures on the pair of nasal prongs are connected to each other through a connecting portion, and the connecting portion is recessed towards the side of the nasal plug body.

11. The nasal congestion assembly of claim 10, wherein, The baffle structure is detachably sleeved on the nasal prong.

12. The nasal congestion assembly of any one of claims 1, 2, 4, and 5, wherein, The air blocking member includes a folding and telescoping structure that can be folded and telescoped in the axial direction of the nasal prong. The air blocking member is configured to, in use, when the wearer inhales, the air blocking member is elongated, and when the wearer exhales, the air blocking member is folded.

13. The nasal congestion assembly of claim 12, wherein, The folding and telescoping structure includes at least one folding unit, the folding unit is a tube body and communicates with the inner cavity of the nasal prong, the tube body is folded to have a shape gradually tapered from the middle part to both ends in the radial direction, and the maximum outer diameter of the folding and telescoping structure when folded is greater than the outer diameter of the nasal prong.

14. The nasal congestion assembly of claim 13, wherein, The air blocking member includes a plurality of folding units stacked in the axial direction of the nasal prong; or the plurality of folding units are helically stacked around the axial direction of the nasal prong.

15. The nasal congestion assembly of claim 12, wherein, The folding and telescoping structure satisfies at least one of the following conditions: The width of the folding and telescoping structure when elongated is 2mm-8.5mm; The width of the folding and telescoping structure when folded is 2.5mm-10mm; the total length of the nasal prong when the folding telescopic structure is extended is 5mm-15mm; the total length of the nasal prong when the folding telescopic structure is folded is 4mm-14mm.

16. A nasal oxygen cannula, characterized in that a nasal tampon assembly as claimed in any of claims 1-15.

17. A ventilation therapy apparatus, characterized by The ventilation therapy apparatus comprises the nasal oxygen cannula as claimed in claim 16.

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