Bilateral universal pressure regulating type high-flow nasopharyngeal airway

Abstract

The invention provides a bilateral general pressure regulating type high-flow nasopharynx breather pipe which comprises a nasopharynx breather pipe body, a nasal pipe connector communicated with the tail of the nasopharynx breather pipe body in a sealed mode and an oxygen supply connector used for being connected with an oxygen source which are sequentially connected, and the nasal pipe connector and the oxygen supply connector rotate in a matched and limited mode corresponding to the connecting portion and are provided with corresponding adjustable pressure relief openings. The position and the size of the left side or the right side of the adjustable pressure relief opening are adjusted through rotary displacement of the nasal tube connector and the oxygen supply connector, the device is universal in the left nasal cavity and the right nasal cavity, the PEEP effect during high-flow oxygen inhalation can be adjusted, respiratory support is implemented, and the device is simple in structure, low in cost, disposable, safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a bilateral universal pressure-adjustable high-flow nasopharyngeal airway. Background Technology

[0002] Patients often experience varying degrees of respiratory depression and airway obstruction due to posterior displacement of the tongue during the recovery period from intravenous and general anesthesia. For airway obstruction, the best treatment is to insert a nasopharyngeal airway through the nose to relieve the obstruction. For respiratory depression caused by reduced ventilation, the best treatment is high-flow oxygen therapy. When ventilation is low, the PEEP value generated by high-flow oxygen therapy needs to be increased to improve the volume of oxygen supplied to the patient. When upper airway obstruction is accompanied by respiratory arrest, mechanical ventilation is necessary, requiring a spare anesthesia machine. However, in intravenous anesthesia facilities, it is difficult to equip each patient with an anesthesia machine, and temporarily transporting an anesthesia machine is extremely cumbersome and wastes valuable resuscitation time.

[0003] In clinical settings where high-flow oxygen therapy via nasopharyngeal airways is lacking, further increasing the PEEP value during high-flow oxygen therapy to enhance respiratory volume and provide respiratory support in the event of apnea would undoubtedly provide anesthesiologists with a powerful means of respiratory assistance. Summary of the Invention

[0004] To address the aforementioned deficiencies in the prior art, the present invention provides a bilateral universal pressure-regulating high-flow nasopharyngeal airway, comprising a nasopharyngeal airway, a nasal tube interface sealed and connected to the tail end of the nasopharyngeal airway, and an oxygen supply interface connected to an oxygen supply tube, wherein the nasal tube interface and the oxygen supply interface are rotatably sleeved together. The nasal tube interface sidewall is provided with a nasal tube pressure relief port, and the oxygen supply interface sidewall is provided with an oxygen supply pressure relief port. The height of the nasal tube pressure relief port and the height of the oxygen supply pressure relief port are adapted to each other. The nasal tube pressure relief port of the nasal tube interface can be rotated with the oxygen supply pressure relief port of the oxygen supply interface to adjust the area of ​​communication with the outside.

[0005] Furthermore, the nasal tube interface is inserted into the oxygen supply interface, the outer wall of the nasal tube interface is provided with an annular boss, and the inner wall of the oxygen supply interface is provided with an annular groove that matches the annular boss.

[0006] Furthermore, the nasal tube interface is provided with nasal tube pressure relief ports on the left and right sides corresponding to the nasopharyngeal airway.

[0007] Furthermore, the nasal cannula interface and the oxygen supply interface are provided with an adjustment block and an annular serrated surface on the adapter surface, and the adjustment block is adapted to fit into the recess of the annular serrated surface.

[0008] Furthermore, the upper part of the oxygen supply interface is provided with an oxygen inlet for connecting the oxygen supply pipe, and the bottom edge of the oxygen inlet is higher than the upper edge of the oxygen supply pressure relief port.

[0009] Furthermore, a gripping part is provided on the lower outer wall of the nasal tube interface, and the gripping part protrudes from the outer wall of the oxygen supply interface.

[0010] Furthermore, a CO2 collection cavity is embedded in the inner wall of the nasopharyngeal airway, with the head end of the CO2 collection cavity opening inside the nasopharyngeal airway and the tail end of the CO2 collection cavity exiting the nasopharyngeal airway and connected to a CO2 collection port.

[0011] Furthermore, the nasal tube pressure relief port and the oxygen supply pressure relief port are of the same shape and size, and their area is not less than 2 / 3 of the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway.

[0012] Furthermore, the oxygen supply interface is provided with a fixed pressure relief port, the area of ​​which is 0.2-0.5 times the cross-sectional area of ​​the nasopharyngeal airway cavity.

[0013] Furthermore, the corresponding connecting area of ​​the nasal tube pressure relief port and the oxygen supply pressure relief port is at least 0 and at most not less than 0.5 times the cross-sectional area of ​​the nasopharyngeal airway cavity; or, the corresponding connecting area of ​​the nasal tube pressure relief port and the oxygen supply pressure relief port is at least 0.2 times the cross-sectional area of ​​the nasopharyngeal airway cavity and at most not less than 0.5 times the cross-sectional area of ​​the nasopharyngeal airway cavity.

[0014] The beneficial effects of this invention are: 1. When the tongue falls back, inserting it through the nose can relieve airway obstruction and provide oxygen; 2. Can be inserted into either the left or right nasal cavity; 3. When ventilation is insufficient, high-flow oxygen therapy can be administered to generate appropriate gas pressure in front of the glottis, which helps to increase ventilation and blood oxygen content. 4. If the patient's ventilation is insufficient, the pressure relief port can be adjusted to increase the PEE value and thus increase the ventilation. 5. Insert high-flow oxygen into one nostril, and the oxygen discharged through the pressure relief port will provide oxygen to the other nostril; 6. End-tidal carbon dioxide testing can be performed to detect carbon dioxide accumulation in a timely manner; 7. The pressure relief port size adjustment is highly continuous and stable, preventing the pressure relief port from changing on its own due to air pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 A front view of the assembly of the nasal cannula interface and the oxygen supply interface; Figure 4 This is an assembly cross-sectional view of the nasal cannula interface and oxygen supply interface of the present invention. Figure 5 This is a schematic diagram of the assembly structure of the nasal cannula interface and the oxygen supply interface of the present invention; Figure 6This is an exploded view of the nasal cannula interface and oxygen supply interface of the present invention. Figure 7 This is an exploded view of the nasal cannula interface and oxygen supply interface of the present invention from another perspective. Figure 8 This is a half-sectional view of the assembly structure of the nasal cannula interface and the oxygen supply interface of the present invention. In the picture, 1. Nasopharyngeal airway; 11. CO2 collection chamber; 2. Nasal tube interface; 21. Adjustment block; 22. Grip part; 3. Oxygen supply interface; 31. Annular serrated surface; 32. Oxygen inlet; 33. Fixed pressure relief port; 41. Annular boss; 42. Annular groove; 51. Nasal tube pressure relief port; 52. Oxygen supply pressure relief port. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of the present invention and to make the above-mentioned features, objectives, and advantages of the present invention clearer and easier to understand, the present invention will be further described below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0018] To address the aforementioned clinical problems, such as Figure 1-8 As shown, the present invention relates to a bilateral universal pressure-regulating high-flow nasopharyngeal airway, comprising a nasopharyngeal airway 1, a nasal tube interface 2 sealed and connected to the tail end of the nasopharyngeal airway 1, and an oxygen supply interface 3 connected to an oxygen supply tube, which are rotatably sleeved together. The nasopharyngeal airway 1 is basically the same in shape as a traditional nasopharyngeal airway, being a soft, flexible, long tube. During use, it is inserted through the nasal cavity, with the head end located within the pharynx, providing a breathing pathway from the nasal cavity to the pharynx, thereby relieving upper airway obstruction. Both the nasal tube interface 2 and the oxygen supply interface 3 are rigid cavity shells. The head end of the nasal tube interface 2 is sealed and fixedly connected to the tail end of the nasopharyngeal airway 1, and the oxygen supply interface 3 is connected to the oxygen supply tube. Simultaneously, the tail end of the nasal tube interface 2 and the head end of the oxygen supply interface 3 are rotatably sleeved together, allowing free rotation around the central axis of the sleeve, but preventing movement along the extended axis. The nasopharyngeal airway 1, nasal tube interface 2, and oxygen supply interface 3 are connected in sequence to form a connecting cavity from the oxygen supply tube of oxygen supply interface 3 to the inner cavity of oxygen supply interface 3, to the inner cavity of nasal tube interface 2, and then to the inner cavity of nasopharyngeal airway 1. The end of the oxygen supply tube is connected to a low-to-medium flow oxygen source, so that the patient can be provided with low-to-medium flow oxygen through this connecting cavity. If a high-flow oxygen source is connected, high-flow oxygen can be provided.

[0019] At the connection point where the nasal tube interface 2 and the oxygen supply interface 3 are rotatably sleeved, the nasal tube interface 2 and the oxygen supply interface 3 are fitted together in terms of thickness, and their adjacent ends are nested together to form a double-layered cylindrical structure. In the double-layered cylindrical section, the nasal tube interface 2 has a nasal tube pressure relief port 51 on its side wall, while the rest of the section is a sealed tube wall. Simultaneously, at a height compatible with the nasal tube pressure relief port 51, the oxygen supply interface 3 has an oxygen supply pressure relief port 52 on its side wall. The height of the nasal tube pressure relief port 51 and the size and height of the oxygen supply pressure relief port 52 are matched.

[0020] In the double-layered cylindrical cavity, the portions of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 that do not correspond to each other are mutually covered by their respective tube walls and are not connected to the outside. The portions of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 that correspond to each other are not covered by their respective tube walls and are connected to the outside, forming a gas outlet with an adjustable connectable area. Specifically, the nasal tube interface 2 and the oxygen supply interface 3 rotate along the same central axis, causing the nasal tube pressure relief port 51 of the nasal tube interface 2 and the oxygen supply pressure relief port 52 of the oxygen supply interface 3 to rotate. This allows the positions of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 to be completely corresponding, partially corresponding, or completely misaligned. By rotating and adjusting the corresponding connectable area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 to the outside, the connectable area between the inner cavity of the double-layered cylindrical cavity and the outside can be adjusted.

[0021] When a high-flow oxygen source is connected to the end of the oxygen supply tube and provides high-flow oxygen to the patient via the nasopharyngeal airway 1, the high-flow oxygen flow generates a certain gas pressure in the inner cavity of the double-walled tubular section, providing some assistance to the patient's inhalation, strengthening alveolar expansion, and allowing for the inhalation of more oxygen. During high-flow oxygen inhalation, the gas pressure in the inner cavity of the double-walled tubular section is not only related to the specific flow rate of oxygen, but also directly related to the size of the corresponding connecting area between the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52. The larger the corresponding connecting area between the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52, the smaller the resistance to gas discharge through that connecting area, and the lower the gas pressure generated, i.e., the worse the PEEP effect, and vice versa.

[0022] In practical use, the corresponding connection area between the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 should be adjusted to the maximum. When respiratory depression does not occur, provide the patient with low to medium flow oxygen. When respiratory depression occurs and blood oxygen saturation shows a downward trend, immediately increase the oxygen flow rate to 20 L / min to provide high flow oxygen. If blood oxygen saturation still cannot be restored, the corresponding connection area between the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 should be reduced to increase the PEEP value of high flow oxygen and enhance the oxygenation effect. When the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are completely misaligned and the connection area with the outside is completely closed, and blood oxygen saturation still cannot be restored to normal, further increase the high flow oxygen flow rate to further increase the PEEP value of high flow oxygen. When the oxygen flow rate is increased to 70 L / min, and blood oxygen saturation still cannot improve and gradually return to normal, mask-assisted artificial ventilation or endotracheal intubation mechanical ventilation is required.

[0023] In practical implementation, the main bodies of the nasal tube interface 2 and oxygen supply interface 3 are optimally circular, with an inner diameter that is 1-2 times that of the nasopharyngeal airway 1. This ensures that oxygen does not generate ventilation resistance greater than that of the nasopharyngeal airway 1 within the connection cavity of the nasal tube interface 2 and oxygen supply interface 3. The nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are optimally of equal size, both being 0.6-1 times the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway 1. By rotating both, the area of ​​the connection to the outside can be minimized, completely sealed, maximizing the PEE value generated by high-flow oxygen inhalation. Alternatively, by rotating both, the area of ​​the connection to the outside can be adjusted to a suitable range to meet clinical needs, with a maximum of 0.6-1 times the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway 1. At this point, the PEEP value generated by the maximum high-flow oxygen inhalation used clinically is extremely small (0 < PEEP value < 2 cmH2O), thus preserving the amplified inspiratory effect of high-flow oxygen inhalation while having almost no impact on exhalation.

[0024] Furthermore, such as Figure 4 , 6As shown in Figure -8, a preferred embodiment of the rotatable connection between the nasal cannula interface 2 and the oxygen supply interface 3 is illustrated: the nasal cannula interface 2 is inserted into the oxygen supply interface 3, with the adjacent portion of the rotatable connection between the nasal cannula interface 2 and the oxygen supply interface 3 having an annular protrusion 41 on its outer wall, and an annular groove 42 adapted to the annular protrusion 41 on the inner wall of the oxygen supply interface 3 at a corresponding height. The height of the annular protrusion 41 is slightly less than the depth of the annular groove 42. After the nasal cannula interface 2 and the oxygen supply interface 3 are aligned and connected, the annular protrusion 41 of the nasal cannula interface 2 is embedded in the annular groove 42 of the oxygen supply interface 3, forming a mutually restrictive rotatable annular structure. This allows the central axes of the nasal cannula interface 2 and the oxygen supply interface 3 to overlap, enabling them to rotate around the central axis, but they are restricted from separating along their long axis. This ensures that the nasal tube inlet 2 and the oxygen supply inlet 3 are fixed in the long axis direction, so that the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are highly aligned. When the nasal tube inlet 2 and the oxygen supply inlet 3 rotate, the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 can be completely covered by each other's tube walls and not connected to the outside, or partially covered and partially connected to the outside, or completely aligned and fully connected to the outside.

[0025] Furthermore, such as Figure 4 , 6 As shown in Figure -8, in the cross-section of the connection between the nasal tube interface 2 and the oxygen supply interface 3, the arc length of the missing portion corresponding to the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52, together with the arc length of the actual tube wall, constitutes an annular cross-section. Nasal tube pressure relief ports 51 are respectively provided on the left and right sides of the nasopharyngeal airway 1 corresponding to the nasal tube interface 2. Thus, after the nasopharyngeal airway 1 is adapted for insertion into the left or right nasal cavity, the rotation of the oxygen supply interface 3 at the nasal tube interface 2 causes the oxygen supply pressure relief port 52 to correspond to the right or left nasal tube pressure relief port 51 of the nasal tube interface 2, thereby enabling the product to be used effectively in both nasal cavities.

[0026] Specifically: If the nasopharyngeal airway 1 is inserted into the right nasal cavity (the right nasal cavity is larger than the left in most patients, which is the most common cause), rotate the oxygen supply interface 3 so that the oxygen supply pressure relief port 52 aligns with the nasal tube pressure relief port 51 on the left side of the nasal tube interface 2. At this time, the nasal tube pressure relief port 51 on the right side of the nasal tube interface 2 is covered. The part of the oxygen supply pressure relief port 5 and the pressure relief port 51 that connects to the outside is on the left side of the nasopharyngeal airway 1, corresponding to the left nostril. The discharged oxygen is closest to the left nostril, providing oxygen flow for inhalation through the left nostril. Similarly, if the nasopharyngeal airway 1 is inserted into the left nasal cavity, rotate the oxygen supply interface 3 so that the oxygen supply pressure relief port 52 aligns with the nasal tube pressure relief port 51 on the right side of the nasal tube interface 2. The part of the oxygen supply pressure relief port 5 and the pressure relief port 51 that connects to the right nostril is close to the right nostril. The discharged oxygen provides oxygen flow for inhalation through the right nostril. When the oxygen supply pressure relief port 5 and the pressure relief port 51 are completely covered by each other's tube walls, it has no impact on the effectiveness of use.

[0027] To ensure that the oxygen supply pressure relief port 5 and pressure relief port 51 are completely covered by the solid tube walls of the nasal cannula interface 2 and oxygen supply interface 3, the optimal ratio of the arc length of the nasal cannula pressure relief port 51 and oxygen supply pressure relief port 52 to the arc length of their solid tube walls is 1 / 5 to 1 / 3. If this ratio is too small, the diameters of the nasal cannula interface 2 and oxygen supply interface 3 will be too large, affecting the appearance and user experience; if the ratio is greater than 1 / 3, the oxygen supply pressure relief port 5 and pressure relief port 51 will not be completely covered by the solid tube walls of the nasal cannula interface 2 and oxygen supply interface 3.

[0028] Furthermore, such as Figure 4 , 6 As shown, the nasal cannula interface 2 and the oxygen supply interface 3 are provided with an adjustment block 21 and an annular serrated surface 31 on their adapter surfaces. The adjustment block 21 is fitted into the recess of the annular serrated surface 31. The annular serrated surface 31 can be provided on the nasal cannula interface 2 or the oxygen supply interface 3. Correspondingly, the adjustment block 21 is provided on the oxygen supply interface 3 or the nasal cannula interface 2 opposite to the annular serrated surface 31. For example: the annular serrated surface 31 is provided on the outer wall of the nasal cannula interface 2, and the adjustment block 21 is provided on the inner wall of the oxygen supply interface 3 corresponding to the annular serrated surface 31; or, the annular serrated surface 31 is provided on the inner wall of the oxygen supply interface 3, and the adjustment block 21 is provided on the outer wall of the nasal cannula interface 2 corresponding to the annular serrated surface 31; the annular serrated surface 31 is provided on the upper side of the nasal cannula interface 2 (including the end face or the upward annular surface), and the adjustment block 21 is adapted to be provided on the lower side of the oxygen supply interface 3 with a downward orientation. Figure 4 and Figure 6 (This is the solution); the annular serrated surface 31 is set on the lower side of the oxygen supply interface 3 (including the end face or the upward annular surface), and the adjusting block 21 is adapted to be set on the upper side of the nasal tube interface 2 with the direction downward.

[0029] The adjusting block 21 can rotate on the annular serrated surface 31. It rotates along the center line of the annular band of the annular serrated surface 31. When the top of the adjusting block 21 passes through the serrated protrusion of the annular serrated surface 31, it fits more tightly. When the top of the adjusting block 21 is inserted into the serrated groove of the annular serrated surface 31, it fits more loosely. When the adjusting block 21 is not under force, it is inserted into a corresponding adjacent serrated groove.

[0030] The annular serrated surface 31 is perpendicular to the central axis of the double-layered tube connecting the nasal tube interface 2 and the oxygen supply interface 3, and the axis of the annular serrated surface 31 overlaps with the central axis of the double-layered tube connecting the nasal tube interface 2 and the oxygen supply interface 3. Correspondingly, the vertical distance between the top of the adjusting block 21 and the central axis of the double-layered tube connecting the nasal tube interface 2 and the oxygen supply interface 3 is between the inner and outer diameters of the annular serrated surface 31. In this way, when the nasal tube interface 2 and the oxygen supply interface 3 rotate around the central axis of the double-layered tube, the adjusting block 21 rotates around the central axis of the annular serrated surface 31 on the outer side, and can be adapted and locked with the annular serrated surface 31 at any angle.

[0031] Furthermore, such as Figure 4 , 8 As shown, the oxygen supply interface 3 has an oxygen inlet 32 ​​for connecting the oxygen supply tube at its upper part, and the bottom edge of the oxygen inlet 32 ​​is higher than the upper edge of the oxygen supply pressure relief port 52. The nasal tube interface 2 is inserted into the oxygen supply interface 3 and sleeved with it. The oxygen inlet 32 ​​being located at the upper part of the oxygen supply interface 3 can reduce the height of the oxygen supply interface 3. At the same time, the bottom edge of the oxygen inlet 32 ​​being higher than the upper edge of the oxygen supply pressure relief port 52 can prevent the actual side wall of the nasal tube interface 2 from blocking the oxygen inlet 32 ​​when it is rotated to certain angles.

[0032] Furthermore, such as Figure 3 , 5 As shown in Figures 6-8, a gripping part 22 is provided on the lower outer wall of the nasal tube interface 2, protruding from the outer wall of the oxygen supply interface 3. The nasal tube interface 2 is inserted into and sleeved with the oxygen supply interface 3. To reduce the product height, the length of the nasal tube interface 2 exposed between the oxygen supply interface 3 and the nasopharyngeal airway 1 is optimally 3-5mm. The gripping part 22 protruding from the outer wall of the oxygen supply interface 3 allows the user to grasp the nasal tube interface 2 through the gripping part 22, avoiding the simultaneous grasping of the oxygen supply interface 3 when grasping the nasal tube interface 2, which would be detrimental to rotation operation. The oxygen supply interface 3 is outside the nasal tube interface 2, making it easy to grasp.

[0033] Furthermore, such as Figure 1-2 As shown, a CO2 collection chamber 11 is embedded in the inner wall of the nasopharyngeal ventilation tube 1. The head end of the CO2 collection chamber 11 opens into the nasopharyngeal ventilation tube 1, and the tail end of the CO2 collection chamber 11 exits the nasopharyngeal ventilation tube 1 and connects to a CO2 collection port. When the patient is receiving oxygen, a CO2 collection tube is connected to the CO2 collection port, and the tail end of the CO2 collection tube is connected to a CO2 monitor. Under the action of a negative pressure micropump in the CO2 monitor, the patient's exhaled gas is collected and sent to the CO2 analysis module, which analyzes and displays the exhaled CO2 data, ultimately determining the patient's respiratory status.

[0034] Furthermore, the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are identical in shape and size, with an area not less than 2 / 3 of the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway 1. The equal size and identical shape of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 maximizes their utilization. When the areas of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are equal to 2 / 3 of the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway 1, meaning the maximum connecting area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 is 2 / 3 of the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway 1, the PEEP value generated by high-flow oxygen inhalation through the connecting part of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 is extremely low. Further increasing the area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 would have no practical clinical significance. When the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 overlap, they can be completely misaligned, so that the minimum area connected to the outside world is theoretically 0.

[0035] Furthermore, the oxygen supply interface 3 is equipped with a fixed pressure relief port 33, the area of ​​which is 0.2-0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. In certain extreme conditions, the patient's oral cavity and the other nostril may be blocked from the outside. In this case, if the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are completely misaligned, the nasopharyngeal airway 1 becomes the only channel connecting the patient's respiratory system to the outside world. At this time, the high-pressure central oxygen is directly connected to the patient's respiratory system, with gas only entering and not exiting, resulting in only inhalation and no exhalation, which will lead to serious medical accidents. By setting up the fixed pressure relief port 33, the patient's safety baseline can be ensured in extreme situations. The area of ​​the fixed pressure relief port 33 is 0.2-0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. In this extreme situation, the PEEP value generated is approximately 3-8 mmHg, which provides significant respiratory support and provides a life-saving channel for exhalation in patients in such extreme situations.

[0036] Furthermore, the minimum connecting area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 is 0, and the maximum is not less than 0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. When a fixed pressure relief port 33 with an area of ​​0.2-0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1 is set, there is already a certain basic exhaust channel during high-flow oxygen inhalation. The area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 can be appropriately reduced, ideally to 0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. Adding the area of ​​the fixed pressure relief port 33, when the connecting area with the outside is adjusted to the maximum, it is 0.7-1 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. When respiratory depression is small, a PEEP value of 0-2 mmHg is generated, which can meet the requirements. Clinical use requirements: When respiratory depression is severe, with the fixed pressure relief port 33 area and the area connected to the outside world adjusted to the minimum, which is 0.2-0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1, it can significantly improve the PEEP value during high-flow oxygen therapy, which is generally 3-5 mmHg. Even in the extreme case mentioned above where the patient's oral cavity and the other nostril are both blocked from the outside world, the PEEP value produced will not exceed 8 mmHg, which can maximize the auxiliary effect on respiratory depression and ensure safe and effective use.

[0037] Furthermore, the corresponding connecting area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 is at least 0.2 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1, and at most not less than 0.5 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. The purpose of this arrangement is that when a patient has upper airway obstruction accompanied by severe apnea, simply relieving the upper airway obstruction will not provide much help, even with high-flow oxygen therapy, as the patient will not be breathing; respiratory support is essential. By altering the coordination between the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52, the angle between the corresponding central axes of the two ends of the oxygen supply pressure relief port 52 or the nasal tube pressure relief port 51 is increased. This ensures that regardless of the angle of misalignment, the oxygen supply pressure relief port 52 and the nasal tube pressure relief port 51 cannot be blocked by the substantial sidewalls of the nasal tube interface 2 and the oxygen supply interface 3, thus maintaining a certain connecting area between them. For example, if the symmetrical nasal tube pressure relief ports 51 on both sides are set to 90° and the oxygen supply pressure relief port 52 is set to 100°, no matter how the matching angles of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are rotated, when the connecting area of ​​the two is minimized, the corresponding central axis angles at both ends of the connecting window are 100°-90°=10°.

[0038] Thus, the corresponding connecting areas of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 are set to be at least 0.2 times the cross-sectional area of ​​the nasopharyngeal airway 1 ventilation chamber. Simultaneously, the area of ​​the fixed pressure relief port 33 is also set to be 0.2 times the cross-sectional area of ​​the nasopharyngeal airway 1 ventilation chamber. When the patient is breathing spontaneously, the minimum area of ​​the corresponding connecting areas of the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 plus the area of ​​the fixed pressure relief port 33 is 0.4 times the cross-sectional area of ​​the nasopharyngeal airway 1 ventilation chamber, resulting in a PEEP effect of 2-4 mmHg, providing appropriate support for the patient's spontaneous breathing. When a patient experiences severe apnea, the corresponding connection area of ​​the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 is adjusted to the minimum, that is, 0.2 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. At this time, the doctor performs intermittent blocking and opening actions on the fixed pressure relief port 33 located at the top of the oxygen supply interface 3, so that the connection area between the high-flow oxygen inhalation pathway of the product and the outside world alternates between 0.2 times and 0.4 times the cross-sectional area of ​​the ventilation chamber of the nasopharyngeal airway 1. When the fixed pressure relief port 33 is blocked, a relatively high PEEP value (approximately 6-9 mmHg) is generated when the area connected to the outside is 0.2 times the cross-sectional area of ​​the nasopharyngeal airway 1 ventilation chamber. Under this pressure, a large amount of air enters the patient's lungs, and the chest expands. When the fixed pressure relief port 33 is opened, the area connected to the outside is 0.4 times the cross-sectional area of ​​the nasopharyngeal airway 1 ventilation chamber, resulting in the lowest PEEP value (approximately 2-4 mmHg). This pressure is lower than the pressure in the lungs and airway when the chest recoils, allowing the chest to return to its natural state and air to be expelled from the lungs. Alternating blocking and opening of the fixed pressure relief port 33, alternating chest expansion and contraction, and alternating inhalation and exhalation of air by the lungs completes the breathing process. Doctors can adjust the alternation frequency of blocking and opening the fixed pressure relief port 33, along with the time ratio of blocking to opening, to provide different respiratory support frequencies and inspiratory-expiratory time ratios, thereby achieving satisfactory respiratory support. Without a design where the product's connection area to the outside world is 0.2 times the cross-sectional area of ​​the nasopharyngeal airway 1, when the fixed pressure relief port 33 is blocked, under the extreme condition of closure of both the other nostril and mouth, the extremely high oxygen supply pressure directly and tightly connects to the lungs, potentially causing the intrapulmonary gas pressure to rapidly spike to 300-500 mmHg, resulting in severe lung damage. Because the connection area between the nasal tube pressure relief port 51 and the oxygen supply pressure relief port 52 is at least 0.2 times the cross-sectional area of ​​the nasopharyngeal airway 1, even when the fixed pressure relief port 33 is blocked, the product still has this pressure relief pathway to the outside world, preventing excessively high inhaled oxygen pressure and avoiding barotrauma to the lungs.

[0039] The above embodiments are merely illustrative of the principles and effects of this patent application and are not intended to limit this patent application. Any person skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this patent application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this patent application shall still be covered by the claims of this patent application.

Claims

1. A bilateral universal pressure-adjustable high-flow nasopharyngeal airway, characterized by: It includes a nasopharyngeal airway (1) connected in sequence, a nasal tube interface (2) that is sealed and connected to the tail of the nasopharyngeal airway (1), and an oxygen supply interface (3) that is connected to an oxygen supply tube. The nasal tube interface (2) and the oxygen supply interface (3) are rotatably connected. The nasal tube interface (2) is provided with a nasal tube pressure relief port (51) on its side wall, and the oxygen supply interface (3) is provided with an oxygen supply pressure relief port (52) on its side wall. The height of the nasal tube pressure relief port (51) and the height of the oxygen supply pressure relief port (52) are adapted to each other. The nasal tube pressure relief port (51) of the nasal tube interface (2) can be adjusted to adjust the area connected to the outside world by rotating with the oxygen supply pressure relief port (52) of the oxygen supply interface (3).

2. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 1, characterized in that: The nasal tube interface (2) is inserted into the oxygen supply interface (3). The outer wall of the nasal tube interface (2) is provided with an annular boss (41), and the inner wall of the oxygen supply interface (3) is provided with an annular groove (42) that matches the annular boss (41).

3. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 2, characterized in that: The nasal tube interface (2) is provided with nasal tube pressure relief ports (51) on the left and right sides of the nasopharyngeal airway (1).

4. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 2, characterized in that: The nasal cannula interface (2) and the oxygen supply interface (3) are provided with an adjustment block (21) and an annular serrated surface (31) on the adapter surface. The adjustment block (21) is adapted to fit into the recess of the annular serrated surface (31).

5. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 4, characterized in that: The oxygen supply interface (3) is provided with an oxygen inlet (32) for connecting the oxygen supply pipe at the upper part, and the bottom edge of the oxygen inlet (32) is higher than the upper edge of the oxygen supply pressure relief port (52).

6. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 1, characterized in that: The lower outer wall of the nasal tube interface (2) is provided with a gripping part (22), which protrudes from the outer wall of the oxygen supply interface (3).

7. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 1, characterized in that: The inner wall of the nasopharyngeal airway (1) is fitted with a CO2 collection cavity (11). The head end of the CO2 collection cavity (11) opens into the nasopharyngeal airway (1), and the tail end of the CO2 collection cavity (11) exits the nasopharyngeal airway (1) and is connected to a CO2 collection port.

8. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 1, characterized in that: The nasal tube pressure relief port (51) and the oxygen supply pressure relief port (52) are the same shape and size, and their area is not less than 2 / 3 of the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway (1).

9. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 1, characterized in that: The oxygen supply interface (3) is provided with a fixed pressure relief port (33), the area of ​​which is 0.2-0.5 times the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway (1).

10. The bilateral universal pressure-adjustable high-flow nasopharyngeal airway according to claim 9, characterized in that: The corresponding connecting area of ​​the nasal tube pressure relief port (51) and the oxygen supply pressure relief port (52) is at least 0 and at most not less than 0.5 times the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway (1); or, the corresponding connecting area of ​​the nasal tube pressure relief port (51) and the oxygen supply pressure relief port (52) is at least 0.2 times the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway (1) and at most not less than 0.5 times the cross-sectional area of ​​the ventilation cavity of the nasopharyngeal airway (1).

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