Nasal oxygen supply apparatus

Abstract

The present application discloses a nasal oxygen supply apparatus, comprising: a cylinder, an oxygen supply tube attached to both ends of the cylinder and communicating with an inner cavity of the cylinder; a nasal tube for insertion into a nostril of a patient so that oxygen provided by the oxygen supply tube enters the inner cavity and is supplied to the nostril of the patient through the nasal tube; an exhalation valve allowing exhaled gas from the nostril of the patient to flow to the outside while limiting outside air from entering the inner cavity when the patient inhales; a throttle valve for making the pressure of oxygen in the downstream inner cavity less than the pressure of oxygen in the upstream inner cavity; a valve structure comprising a valve cavity and a valve component, both ends of the valve cavity communicating with outside air and the inner cavity respectively, the valve component being arranged in the valve cavity for controlling the opening and closing of the valve cavity; when the pressure in the oxygen supply tube is greater than a preset pressure, the valve component generates a first action to close the valve cavity, and when the pressure in the oxygen supply tube is less than the preset pressure, the valve component generates a second action to open the valve cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a nasal oxygen supply device. BACKGROUND

[0002] In the prior art, a nasal oxygen supply device generally comprises a barrel having an inner cavity, two nasal tubes formed radially on the barrel and communicating with the inner cavity, and an oxygen supply tube connected to both ends of the barrel for supplying oxygen to the inner cavity of the barrel. The oxygen supply tube is connected to an oxygen source and is controlled to open and close by a solenoid valve. The oxygen provided by the oxygen supply tube enters the patient's nasal cavity in sequence through the inner cavity of the barrel and the nasal tubes, thereby meeting the patient's inhalation. An exhalation valve is also installed on the barrel. The exhalation valve is a check valve that allows nasal exhalation gas but prevents external air from being inhaled by the patient through the exhalation valve, thereby meeting the requirement of inhaling only through the oxygen supply tube.

[0003] To avoid the patient's inability to inhale due to the interruption of oxygen supply by the oxygen supply tube for some reason (for example, the oxygen supply tube is bent to cut off the oxygen path, for example, the oxygen in the oxygen source is used up, for example, the solenoid valve controlling the opening and closing of the oxygen supply tube fails), in the prior art, an electrically controlled safety valve is attached to the barrel, and a sensor is inserted into the inner cavity of the barrel for detecting the oxygen content in the inner cavity. Based on the oxygen content detected by the sensor, the installation valve is controlled to open and close by the solenoid valve. Specifically, if the oxygen content detected by the sensor is low, a control signal is sent to the solenoid module of the safety valve, and the solenoid module controls the safety valve to open, thereby allowing the patient to breathe through the safety valve by connecting the inner cavity of the barrel to the outside.

[0004] However, the addition of an electrically controlled safety valve and a sensor on the oxygen supply device not only requires the addition of a power supply module on the device, but also increases the size of the device, which does not meet the requirement of designing a lightweight nasal device, and increases the cost. SUMMARY

[0005] To solve the above technical problems in the prior art, the embodiments of the present application provide a nasal oxygen supply device.

[0006] To solve the above technical problems, the embodiments of the present application adopt the technical solutions of:

[0007] A nasal oxygen supply device, comprising:

[0008] a barrel defining an inner cavity extending axially therethrough, and an oxygen supply tube for providing oxygen is attached to both ends of the barrel and communicates with the inner cavity;

[0009] two nasal tubes arranged side by side and extending radially from the wall of the cylinder, both of which are in communication with the inner cavity; both of which are used for insertion into the nostrils of a patient respectively, so that the oxygen provided by the oxygen supply tube enters the inner cavity and is supplied to the nostrils of the patient through the nasal tubes;

[0010] an exhalation valve attached to the cylinder, which allows the exhaled gas from the nostrils of the patient to flow to the outside world through the inner cavity, and limits the outside air from entering the inner cavity when the patient inhales;

[0011] a throttle valve transversely arranged in the inner cavity for throttling the oxygen so that the pressure of the oxygen in the downstream inner cavity is less than that in the upstream inner cavity;

[0012] a valve structure comprising a valve cavity and a valve component; both ends of the valve cavity are in communication with the outside air and the inner cavity respectively, and the valve component is arranged in the valve cavity for controlling the opening and closing of the valve cavity; the valve component acts based on the pressure change in the oxygen supply tube to control the opening and closing of the valve cavity: when the pressure in the oxygen supply tube is greater than the preset pressure, the valve component generates a first action to close the valve cavity, and when the pressure in the oxygen supply tube is less than the preset pressure, the valve component generates a second action opposite to the first action to open the valve cavity to allow the patient to inhale air from the outside world through the valve cavity.

[0013] Preferably, the valve component is configured as an air bag with an inflation interface, an inflation flow channel is led out from the upstream inner cavity, the distal end of the inflation flow channel is connected to the inflation interface of the air bag, when the pressure in the oxygen supply tube is greater than the preset pressure, the pressure of the oxygen provided by the inflation flow channel makes the air bag expand to block the valve cavity, and when the pressure in the oxygen supply tube is less than the preset pressure, the air bag shrinks to open the valve cavity.

[0014] Preferably, the valve component is configured as a cylindrical valve core, and the valve structure further comprises a guide cavity, a pilot core, a biasing component and a magnetic component; wherein: a pilot flow channel is led out from the upstream inner cavity, the distal end of the pilot flow channel is in communication with the inner end of the guide cavity, and the pilot core is arranged in the guide cavity and can slide along the guide cavity;

[0015] The biasing component is arranged in the guide cavity for applying a spring force in the direction of the inner end of the guide cavity;

[0016] The magnet assembly comprises a first magnetic component and a second magnetic component arranged on the pilot core and the cylindrical valve core respectively, and the magnetic attraction between the first magnetic component and the second magnetic component makes the cylindrical valve core move synchronously with the pilot core; wherein:

[0017] When the pressure in the oxygen supply pipe is greater than the preset pressure, the pressure of the oxygen provided by the pilot flow channel overcomes the biasing component to make the pilot core slide to the outer end of the guide cavity to drive the cylindrical valve core to slide to the outer end of the valve cavity to close the valve cavity, and when the pressure in the oxygen supply pipe is less than the preset pressure, the biasing component resets to make the pilot core slide to the inner end of the guide cavity to drive the cylindrical valve core to slide to the inner end of the valve cavity to open the valve cavity.

[0018] Preferably, the outer end of the valve cavity is configured with a necking portion; the outer end of the cylindrical valve core is configured with a tapered surface, and a plurality of air guide grooves extending in the axial direction and arranged in the circumferential direction are formed in the outer circumferential surface of the cylindrical valve core, the air guide grooves are through the tapered surface, and the shaft section of the tapered surface which is not through the air guide grooves is used to block the necking portion.

[0019] Preferably, the first magnetic force component is a magnetic ring sleeved outside the pilot core, and the second magnetic force component is a plurality of magnetic sheets attached to the outer circumferential surface of the pilot core between every two adjacent air guide grooves.

[0020] Preferably, a duckbill valve is arranged in the inner cavity between the throttle valve and the nose pipe, when the oxygen supply pipe supplies oxygen, the oxygen forces the duckbill valve to open to supply the patient with oxygen, and when the patient exhales, the duckbill valve automatically closes.

[0021] Preferably, the throttle valve comprises a disc body and a plurality of throttle holes axially through the disc body, and the duckbill valve is attached to the throttle valve.

[0022] Preferably, a strip-shaped attachment component is mounted on the front side of the barrel, and the valve structure and the exhalation valve are arranged in the attachment component.

[0023] Preferably, the exhalation valve is a plate valve, a cover is buckled on the front side of the attachment component, and the cover is used to discharge the gas exhaled through the exhalation valve downward.

[0024] Preferably, the valve structure and the throttle valve each comprise two, and the two valve structures and the two throttle valves are symmetrically arranged.

[0025] Compared with the prior art, the transnasal oxygen supply instrument provided by the embodiment of the present application has the following beneficial effects:

[0026] 1. The valve structure in the transnasal oxygen supply instrument provided by the present application controls the opening and closing of the nose pipe and the ambient gas based on the pressure of the oxygen in the oxygen supply pipe to avoid that the patient cannot inhale when the oxygen supply system cannot work normally, the valve structure controls the opening and closing of the valve cavity by using the pressure change of the oxygen to make the valve component produce mechanical action, thereby avoiding the use of electrically controlled installation valves and sensors to control the opening and closing of the valve cavity, and thus, the instrument does not need to be attached to a power supply module, the volume of the instrument can be configured to be smaller, and the required cost is lower.

[0027] 2. By configuring a throttle valve in the inner cavity of the barrel, the rated oxygen supply pressure of the oxygen supply tube is increased, thereby reducing the influence of the resistance of the relevant components (such as the inner wall of the oxygen supply tube) on the oxygen flow on the one hand, and making the pressure change of the oxygen sufficient to drive the valve component to produce mechanical action to open and close the valve cavity on the other hand. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The schematic diagram of the three-dimensional external structure of the transnasal oxygen supply device provided for the embodiment of the present application and equipped with the valve structure of the first specific structural form.

[0029] Figure 2 The three-dimensional sectional view of the transnasal oxygen supply device provided for the embodiment of the present application (the patient is in the inhalation stage).

[0030] Figure 3 The three-dimensional sectional view of the transnasal oxygen supply device provided for the embodiment of the present application (the patient is in the exhalation stage).

[0031] Figure 4 The three-dimensional sectional view of the transnasal oxygen supply device provided for the embodiment of the present application and equipped with the valve structure of the first specific structural form (the pressure of the oxygen in the oxygen supply tube is greater than the preset pressure).

[0032] Figure 5 The three-dimensional sectional view of the transnasal oxygen supply device provided for the embodiment of the present application and equipped with the valve structure of the first specific structural form (the pressure of the oxygen in the oxygen supply tube is less than the preset pressure).

[0033] Figure 6 The schematic diagram of the three-dimensional external structure of the transnasal oxygen supply device provided for the embodiment of the present application and equipped with the valve structure of the second specific structural form.

[0034] Figure 7 The three-dimensional sectional view of the transnasal oxygen supply device provided for the embodiment of the present application and equipped with the valve structure of the second specific structural form (the pressure of the oxygen in the oxygen supply tube is greater than the preset pressure).

[0035] Figure 8 The enlarged view of the part A of the Figure 1

[0036] Figure 9 The structural schematic diagram of the valve component in the valve structure of the second specific structural form.

[0037] Figure 10 The three-dimensional sectional view of the transnasal oxygen supply device provided for the embodiment of the present application and equipped with the valve structure of the second specific structural form (the pressure of the oxygen in the oxygen supply tube is greater than the preset pressure).

[0038] In the figure:​

[0039] 10 - barrel; 11 - internal cavity; 20 - nasal tube; 30 - attachment member; 40 - exhalation valve; 41 - silica gel sheet; 42 - air outlet groove; 43 - cover; 44 - air outlet groove; 50 - throttle valve; 51 - disc; 52 - throttle hole; 60 - duckbill valve.

[0040] 70 - valve structure; 71 - valve cavity; 72 - valve member; 721 - inflation port; 73 - inflation flow passage.

[0041] 70' - valve structure; 71' - valve cavity; 711' - necked portion; 72' - valve member; 721' - tapered surface; 722' - air guide groove; 73' - pilot flow passage; 74' - pilot core; 75' - guide cavity; 751' - balance hole; 76' - spring; 771' - first magnetic force member; 772' - second magnetic force member. DETAILED DESCRIPTION

[0042] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0043] As shown in Figures 1 to 10 , the embodiment of the present application discloses a transnasal oxygen supply apparatus, which comprises a barrel 10, two nasal tubes 20, an attachment member 30, an exhalation valve 40, a throttle valve 50, a duckbill valve 60, and a valve structure 70, 70'.

[0044] As shown in Figures 2 to 4 , the barrel wall of the barrel 10 defines an axially-through internal cavity 11, and an oxygen supply pipe (not shown) of an oxygen supply system extends from the back side of the head of a patient to both sides of the nose and is connected to both ends of the barrel 10 and communicates with the internal cavity 11. The two nasal tubes 20 are arranged side by side and extend radially from the barrel wall of the back side of the barrel 10, both of which communicate with the internal cavity 11 of the barrel 10, and are respectively inserted into the two nostrils of the nose of the patient. During the inhalation stage of the patient, the oxygen supply pipe provides positive pressure oxygen to the internal cavity 11 from both ends of the barrel 10, and the provided oxygen is supplied into the nostrils of the patient through the two nasal tubes 20 to supply the patient to inhale by means of positive pressure oxygen supply.

[0045] The throttle valve 50 includes two, both of which are arranged symmetrically in the inner cavity 11 and outside the axial position of the two nasal tubes 20, so that the oxygen from both ends of the cylinder 10 enters the nostrils through the throttle valve 50, which throttles the oxygen passing through the inner cavity 11, which makes the pressure of the oxygen on the side of the end of the cylinder 10 greater than that on the side of the nasal tube 20, that is, the pressure of the oxygen upstream of the inner cavity 11 is greater than that downstream of the inner cavity 11. The throttle valve 50 is not aimed at reducing the oxygen flow into the nasal tube 20, but at increasing the pressure of the upstream oxygen under the premise of maintaining the required downstream oxygen pressure and flow by increasing the upstream oxygen pressure, and the effect of increasing the upstream oxygen pressure is: on the one hand, the oxygen supply system can obtain a larger rated pressure range, that is, even if the pressure fluctuation of the oxygen supply system is larger, the flow of oxygen supplied to the nostrils will not change too much, thereby reducing the influence of resistance factors on the oxygen supply flow; on the other hand, it is beneficial to use the upstream oxygen pressure as a control pressure, which will be described below. Preferably, the throttle valve 50 is configured in a disc structure, specifically, the throttle valve 50 includes a disc body 51 transversely arranged in the cylindrical inner cavity 11, and a plurality of throttle holes 52 are formed in the disc body 51 and axially pass through the disc body 51 in a spiral manner, and the oxygen passes through the plurality of throttle holes 52.

[0046] The duckbill valve 60 is arranged in the inner cavity 11 between the nasal tube 20 and the throttle valve 50, and has an open part and a mouth part, the mouth part is consistent with the flow direction of the oxygen, and the open part of the duckbill valve 60 is preferably attached to the edge of the disc body 51 of the throttle valve 50. During the patient's inhalation phase, the oxygen makes the mouth part of the duckbill valve 60 open and flows through the mouth part to enter the nasal tube 20, and during the patient's inhalation phase, the mouth part of the duckbill valve 60 is automatically closed, thereby avoiding the exhaled gas of the patient flowing in the reverse direction into the upstream inner cavity 11 through the duckbill valve 60.

[0047] The attachment component 30 is configured in a rectangular strip shape, which is attached to the front side of the cylinder 10, and the exhalation valve 40 is arranged in the attachment component 30. Specifically, a hollow part is formed in the cylinder wall of the front side of the cylinder 10, and the exhalation valve 40 includes a gas outlet groove 42 formed on the attachment component 30 and extending from the rear side to the front side and being divided into two parts by a middle beam, and a silica gel sheet 41 covering the front port of the gas outlet groove 42 and being fixed to the beam in the middle. As shown in Figure 3 the exhalation phase, the duckbill valve 60 is closed, and the exhaled gas deforms the silica gel sheet 41 to open the gas outlet groove 42, so that the exhaled gas is discharged to the outside through the gas outlet groove 42. The deformation rigidity of the configured silica gel sheet 41 should not be too small to avoid the inhalation phase (i.e. the oxygen supply phase, as Figure 3As shown, deformation of the silicone sheet 41 causes significant oxygen leakage through the exhalation valve 40. In some preferred configurations, a cover 51 is fastened to the front of the attachment part 30, and an exhaust groove 44 is formed at the bottom of the cover 51. The exhaust groove 44 faces downward and communicates with the air outlet groove 42, so that the gas exhaled by the patient is guided downward by the exhaust groove 44 to avoid being covered or blocked by external objects as much as possible.

[0048] Valve structures 70 and 70' are mounted on the attachment part 30. These valve structures 70 and 70' function as safety valves, and their function is as follows: Figure 4 and Figure 7 As shown, if the oxygen pressure in the upstream inner cavity 11 (in fact, the oxygen pressure in the upstream inner cavity 11 is basically equal to the pressure at the port of the supply pipe) is greater than the preset pressure, then valve structures 70 and 70' close the channel connecting the downstream inner cavity 11 to the outside, as shown. Figure 5 and Figure 10 As shown, if the oxygen pressure in the upstream inner cavity 11 is less than the preset pressure, valve structures 70 and 70' open the channel connecting the downstream inner cavity 11 to the outside. This preset pressure can be set based on the oxygen supply system's rated pressure range. Specifically, it can be set by using a pressure lower than the rated pressure as the preset pressure. Therefore, if the actual oxygen pressure in the upstream inner cavity 11 is less than the preset pressure, it indicates that the oxygen supply system cannot maintain the minimum oxygen supply parameters, and the patient needs to rely on outside air for oxygen supply. The reasons why the oxygen supply system cannot maintain the minimum oxygen supply parameters may include: for example, insufficient oxygen source, failure of electrical control components (system), or a hard bend in the oxygen supply tube.

[0049] There are two valve structures 70 and 70', symmetrically arranged and corresponding to two throttle valves 50 respectively. Each valve structure 70 and 70' includes valve chambers 71 and 71' and valve components 72 and 72'. Valve chambers 71 and 71' are located near the end of the attachment member 30, extending towards the front and rear sides of the attachment member 30. The outer ends of valve chambers 71 and 71' penetrate the front side of the attachment member 30 and communicate with the outside. The inner ends of valve chambers 71 and 71' penetrate the rear side of the attachment member 30 and communicate with the downstream inner cavity 11 through a perforated portion on the front side of the cylinder 10. Valve components 72 and 72' are disposed within valve chambers 71 and 71', and these valve components 72 and 72' actuate based on changes in oxygen pressure in the upstream inner cavity 11, such that: Figure 4 and Figure 7 As shown, when the oxygen pressure in the upstream inner cavity 11 is greater than the preset pressure, it indicates that the pressure and flow rate of oxygen supplied by the oxygen supply tube are sufficient. Valve components 72 and 72' then perform their first action, closing valve chambers 71 and 71', thereby restricting the patient's inhalation through valve chambers 71 and 71' and using the oxygen supply tube. Figure 5and Figure 10 As shown, when the oxygen pressure in the upstream inner cavity 11 is less than the preset pressure, it indicates that the pressure and flow rate of the oxygen supplied by the oxygen supply tube are insufficient. The valve components 72 and 72' perform a second action opposite to the first action, opening the valve chambers 71 and 71', thereby allowing the patient to inhale from the outside through the valve chamber 71', so as to avoid the device inhibiting inspiration.

[0050] This invention provides two types of valve structures.

[0051] The first type of valve structure 70.

[0052] like Figures 1 to 5 As shown, in this valve structure 70, the valve component 72 is configured as an airbag with an inflation port 721. This airbag can be made of thin and highly elastic silicone, and an inflation channel 73 extends from the upstream inner cavity 11, the end of which is connected to the inflation port 721 of the airbag. Thus, as... Figure 4 As shown, when the oxygen pressure in the upstream inner cavity 11 is greater than the preset pressure, the oxygen inflates the airbag, causing it to expand (the first action is expansion) to the extent that it seals the valve cavity 71, thereby closing the valve cavity 71. Figure 5 As shown, when the oxygen pressure in the upstream inner cavity 11 is less than the preset pressure, the airbag contracts due to insufficient oxygen pressure (the second action is contraction) to the extent that the valve cavity 71 is at least partially opened, thereby allowing the patient to inhale from the outside through the valve cavity 71.

[0053] The second type of valve structure 70'.

[0054] like Figures 6 to 10 As shown, in this valve structure 70', the valve component 72' is configured as a columnar valve core made of lightweight material, and the valve cavity 71' is configured as a columnar cavity extending in a straight line. The outer end of the valve cavity 71' is connected to the outside, and the inner end of the valve cavity 71' is connected to the downstream inner cavity 11 through the hollow part on the front side of the cylinder 10. The valve structure 70' also includes a guide cavity 75', a pilot core 74', a spring 76' (as a biasing component), and a magnetic assembly; the guide cavity 75' is arranged in parallel with the valve cavity 71', and a pilot flow channel 73' is led out from the upstream inner cavity 11. The end of the pilot flow channel 73' is connected to the inner end of the guide cavity 75'. The outer end of the guide cavity 75' has a balance vent 751' that communicates with the outside. The pilot core 74' is disposed in the guide cavity 75' and can slide along the guide cavity 75'. The spring 76' is disposed in the guide cavity 75' and elastically pushes the pilot core 74' towards the inner end of the guide cavity 75'.

[0055] The outer end of the valve cavity 71' is configured with a neck 711', which has a radial dimension smaller than that of the main body shaft section of the valve cavity 71', and the outer end of the valve member 72' is configured with a tapered surface 721', and the outer circumferential surface of the valve member 72' is provided with a plurality of air guide grooves 722' arranged circumferentially and extending axially through the valve member 72' at both ends thereof, the outer end of the air guide groove 722' being in communication with the bottom shaft section of the tapered surface 721', and the top shaft section of the tapered surface 721' being a complete smooth tapered surface 721'.

[0056] The magnetic force assembly includes a first magnetic force component 771' and a second magnetic force component 772', the first magnetic force component 771' being arranged on the pilot core 74', and the second magnetic force component 772' being arranged on the valve member 72', so that the magnetic poles of the first magnetic force component 771' and the second magnetic force component 772' are arranged to form magnetic attraction between the first magnetic force component 771' and the second magnetic force component 772', so that when the pilot core 74' slides axially along the guide cavity 75', the valve member 72' moves synchronously with the pilot core 74' in the same direction by the magnetic attraction.

[0057] Based on the above:

[0058] As shown in Figure 7 when the pressure of oxygen in the upstream inner cavity 11 is greater than the preset pressure, the pressure of oxygen from the pilot flow channel 73' overcomes the elastic force of the spring 76' to drive the pilot core 74' to move to the outer end side of the guide cavity 75', and the valve member 72' moves synchronously with the pilot core 74' to the outer end side of the valve cavity 71' (the first movement is the movement of the valve member 72' from the inner end to the outer end of the valve cavity 71'), at this time, the tapered surface 721' of the top shaft section of the outer end of the valve member 72' blocks the neck 711', thereby closing the valve cavity 71', as shown in Figure 10 when the pressure of oxygen in the upstream inner cavity 11 is less than the preset pressure, the spring 76' overcomes the pressure of oxygen to drive the pilot core 74' to move to the inner end side of the guide cavity 75', and the valve member 72' moves synchronously with the pilot core 74' to the inner end side of the valve cavity 71' (the second movement is the movement of the valve member 72' from the outer end to the inner end of the valve cavity 71'), at this time, the neck 711' of the outer end of the valve cavity 71' is opened, and the ambient air can enter the downstream inner cavity 11 through the neck 711' and the plurality of air guide grooves 722' arranged circumferentially on the valve member 72', that is, the valve cavity 71' is opened.

[0059] In some preferred structures, the pilot core 74' is made of a light material, the first magnetic force component 771' is a magnetic ring, the magnetic ring is sleeved on the outer side of the pilot core 74' and fixed with the pilot core 74', and the second magnetic force component 772' is a plurality of magnetic sheets attached to the outer circumferential surface of the pilot core 74' between every two adjacent air guide grooves 722'.

[0060] Compared with the first structure, the valve part controls the opening and closing of the valve cavity reliably, the service life of the related parts is longer, the action of the valve part is more sensitive, and the preset pressure can be easily matched with the action of the valve part.

[0061] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the present application.

Claims

1. A transnasal oxygen supply apparatus, characterized by comprising: The application relates to a valve structure for a nasal cannula, comprising: a cylinder defining an axial inner cavity, an oxygen supply tube for providing oxygen being attached to two ends of the cylinder and communicating with the inner cavity; two nasal tubes arranged side by side and extending radially from the cylinder wall of the cylinder, both of the nasal tubes communicating with the inner cavity, and being respectively inserted into two nostrils of a patient so that oxygen provided by the oxygen supply tube enters the inner cavity and is supplied to the nostrils of the patient through the nasal tubes; an exhalation valve attached to the cylinder, the exhalation valve allowing exhaled gas from the nostrils of the patient to flow to the outside through the inner cavity and limiting outside air from entering the inner cavity when the patient inhales; a throttle valve transversely arranged in the inner cavity for throttling oxygen so that the pressure of oxygen in the downstream inner cavity is lower than that in the upstream inner cavity; a valve structure comprising a valve cavity and a valve component, two ends of the valve cavity respectively communicating with outside air and the inner cavity, the valve component being arranged in the valve cavity for controlling the opening and closing of the valve cavity, the valve component acting based on pressure change in the oxygen supply tube to control the opening and closing of the valve cavity, when the pressure in the oxygen supply tube is greater than a preset pressure, the valve component generates a first action to close the valve cavity, and when the pressure in the oxygen supply tube is less than the preset pressure, the valve component generates a second action opposite to the first action to open the valve cavity and allow the patient to inhale outside air through the valve cavity; the valve component is configured as a cylindrical valve core, the valve structure further comprises a guide cavity, a pilot core, a biasing component and a magnetic force assembly, wherein a pilot flow channel is led out from the upstream inner cavity, a distal end of the pilot flow channel communicates with an inner end of the guide cavity, the pilot core is arranged in the guide cavity and can slide along the guide cavity; the biasing component is arranged in the guide cavity for applying elastic force to the inner end of the guide cavity; the magnetic force assembly comprises a first magnetic force component and a second magnetic force component arranged on the pilot core and the cylindrical valve core respectively, magnetic attraction between the first magnetic force component and the second magnetic force component enables the cylindrical valve core to move synchronously with the pilot core; wherein: when the pressure in the oxygen supply tube is greater than the preset pressure, the pressure of oxygen provided by the pilot flow channel overcomes the biasing component, so that the pilot core slides to the outer end of the guide cavity to drive the cylindrical valve core to slide to the outer end of the valve cavity to close the valve cavity, and when the pressure in the oxygen supply tube is less than the preset pressure, the biasing component resets so that the pilot core slides to the inner end of the guide cavity to drive the cylindrical valve core to slide to the inner end of the valve cavity to open the valve cavity.

2. The nasal oxygen delivery apparatus of claim 1, wherein, an outer end of the valve cavity is configured with a necking, an outer end of the cylindrical valve core is configured with a tapered surface, a plurality of air guide grooves extending in the axial direction and arranged in the circumferential direction are formed on the outer circumferential surface of the cylindrical valve core, the air guide grooves communicate with the tapered surface, and the axis section of the tapered surface not communicating with the air guide grooves is used for plugging the necking.

3. The nasal oxygen delivery apparatus of claim 2, wherein, the first magnetic force component is a magnetic ring sleeved outside the pilot core, and the second magnetic force component is a plurality of magnetic sheets attached to the outer circumferential surface of the pilot core between every two adjacent air guide grooves.

4. The nasal oxygen delivery apparatus of claim 1, wherein, A duckbill valve is arranged in the inner cavity between the throttle valve and the nasal tube, when the oxygen supply tube supplies oxygen, the oxygen forces the duckbill valve to open for the patient to inhale oxygen, when the patient exhales, the duckbill valve is automatically closed.

5. The nasal oxygen delivery apparatus of claim 4, wherein, The throttle valve comprises a disc body and a plurality of throttle holes axially penetrating the disc body, and the duckbill valve is attached to the throttle valve.

6. The nasal oxygen delivery apparatus of claim 1, wherein, A strip-shaped attachment part is mounted on the front side of the barrel, and the valve structure and the exhalation valve are arranged in the attachment part.

7. The nasal oxygen delivery apparatus of claim 6, wherein, The exhalation valve is a plate valve, a cover is buckled on the front side of the attachment part, and the cover is used for discharging the gas exhaled through the exhalation valve downward.

8. The nasal oxygen delivery apparatus of claim 1, wherein, The valve structure and the throttle valve each comprise two, and the two valve structures and the two throttle valves are symmetrically arranged.

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