Nasopharynx breather pipe

Abstract

The utility model provides a nasopharynx breather pipe, and belongs to the field of medical instruments. The nasopharynx breather pipe comprises a gas guide pipe, a monitoring pipe and an adapter. The adapter is arranged at one end of the gas-guide tube, the monitoring tube penetrates through the adapter and extends into the gas-guide tube, the tube section, located in the gas-guide tube, of the monitoring tube is provided with a first monitoring port and a second monitoring port, the first monitoring port is located at the end of the monitoring tube, and the second monitoring port is located on the tube wall of the monitoring tube. The first monitoring port and the second monitoring port are formed in the monitoring pipe, so that the sampling efficiency is improved; moreover, the positions of the two monitoring ports are different, so that the two monitoring ports can collect samples at different positions, and the accuracy of monitoring data is improved; besides, the first monitoring port and the second monitoring port are different in position and orientation, so that the risk that the two monitoring ports are blocked at the same time can be reduced, and the monitoring pipe can normally collect samples.

Description

Technical Field

[0001] The utility model belongs to the field of medical instruments, and in particular relates to a nasopharyngeal ventilation tube. Background Art

[0002] The nasopharyngeal airway is an artificial airway inserted into the patient's pharynx through the nostrils. Its main function is to prevent the root of the tongue from falling back and reduce the damage to the nasal mucosa caused by suctioning sputum. It can be used for conscious patients.

[0003] There is a monitoring tube inside the nasopharyngeal airway, which is used for sampling to monitor the patient's respiratory rate, O2 concentration and CO2 concentration. However, during the use of the nasopharyngeal airway, due to the accumulation of secretions in the nasal cavity, long-term use can easily clog the sampling end of the monitoring tube, causing false alarms and causing harm to the patient. Utility Model Content

[0004] The purpose of this application is to provide a nasopharyngeal ventilation tube to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] The present application provides a nasopharyngeal ventilation tube, comprising an airway tube, a monitoring tube and an adapter; the adapter is arranged at one end of the airway tube, the monitoring tube passes through the adapter and extends into the airway tube, and the section of the monitoring tube located in the airway tube has a first monitoring port and a second monitoring port, the first monitoring port is located at the end of the monitoring tube, and the second monitoring port is located at the tube wall of the monitoring tube.

[0007] The technical solution provided by this application can achieve the following beneficial effects:

[0008] In the present application, by setting the first monitoring port and the second monitoring port in the monitoring tube, sampling can be carried out at the two monitoring ports, which can improve the sampling efficiency; and the first monitoring port is set at the end of the monitoring tube, and the second monitoring port is set at the tube wall of the monitoring tube, so that the positions of the two monitoring ports are different, and the two monitoring ports can collect samples at different positions, thereby improving the accuracy of the monitoring data; in addition, since the positions and directions of the first monitoring port and the second monitoring port are different, the risk of the two monitoring ports being blocked at the same time can be reduced, so that the monitoring tube can collect samples normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1The overall structure of the ventilation pipe provided in some embodiments of the present application is shown in FIG. Figure 1 ;

[0011] Figure 2 The overall structure of the ventilation pipe provided in some embodiments of the present application is shown in FIG. Figure 2 ;

[0012] Figure 3 The overall structure of the ventilation pipe provided in some embodiments of the present application is shown in FIG. Figure 3 ;

[0013] Figure 4 is a schematic diagram of the cooperation between the monitoring tube and the adapter provided in some embodiments of the present application;

[0014] Figure 5 is a schematic diagram of the structure of an adapter provided in some embodiments of the present application at a first viewing angle;

[0015] Figure 6 is a schematic diagram of the structure of an adapter provided in some embodiments of the present application at a second viewing angle;

[0016] Figure 7 is a schematic diagram of the overall structure of the filter provided in some embodiments of the present application;

[0017] Figure 8 Some embodiments of the present application provide Figure 6 AA section view;

[0018] Fig. 9 This is a schematic diagram of the disassembly of the filter provided in some embodiments of the present application.

[0019] In the figure: 100-air guide tube, 110-side hole, 120-guide part, 121-arc-shaped guide surface, 130-bevel cut, 140-gas source connector, 150-first pipe section, 160-second pipe section, 200-monitoring tube, 210-first monitoring port, 220-second monitoring port, 300-adapter, 310-first channel, 320-second channel, 321-installation groove, 330-merging cavity, 340-connecting pipe section, 400-limiting member, 500-filter, 510-installation cavity, 511-filter inlet, 512-filter outlet, 520-filter element, 530-first support structure, 540-second support structure, 550-upper shell, 560-lower shell, 570-clamping ring. DETAILED DESCRIPTION

[0020] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0021] The embodiment of the present application provides a nasopharyngeal ventilation tube, which mainly includes an airway tube 100, a monitoring tube 200 and an adapter 300. The airway tube 100 is used to introduce oxygen. The monitoring tube 200 is connected to the monitoring equipment, and samples are obtained through the monitoring tube 200 during the oxygen supply process to monitor the patient's respiratory rate, oxygen concentration, carbon dioxide concentration, etc. at any time. The adapter 300 is arranged at one end of the airway tube 100, and the adapter 300 is mainly used to connect the monitoring tube 200 and the airway tube 100 together, and to introduce oxygen into the airway tube 100. The monitoring tube 200 passes through the adapter 300 and extends into the airway tube 100. The monitoring tube 200 has a first monitoring port 210 and a second monitoring port 220 for sampling. The first monitoring port 210 and the second monitoring port 220 are both located on the pipe section of the monitoring tube 200 located in the airway tube 100.

[0022] The first monitoring port 210 and the second monitoring port 220 can both be used for sampling. Compared with a nasopharyngeal ventilation tube with only one monitoring port, the sampling efficiency of the monitoring tube 200 provided in the embodiment of the present application is higher. In addition, in some embodiments of the present application, the first monitoring port 210 is located at the end of the monitoring tube 200, and the second monitoring port 220 is located at the wall of the monitoring tube 200. Figure 1 and Figure 2 As shown. The first monitoring port 210 and the second monitoring port 220 are set at different positions, which can sample gases at different positions, improve the diversity of samples, thereby reducing the monitoring data error caused by the sampling position and improving the accuracy of the monitoring data. In addition, since the first monitoring port 210 and the second monitoring port 220 are oriented in different directions and the sampling directions of the two are different, the probability of the two monitoring ports being blocked at the same time is low, ensuring that the monitoring tube 200 has at least one monitoring port that can sample normally, so that the monitoring device can monitor the patient's condition in real time.

[0023] Since during the sampling process, the sample generally moves along the axial direction of the monitoring tube 200, and the first monitoring port 210 is located at the end of the monitoring tube 200, and the second monitoring port 220 is located at the tube wall of the monitoring tube 200, the probability of the second monitoring port 220 being blocked is lower than the probability of the first monitoring port 210 being blocked. Even if the first monitoring port 210 is blocked, the second monitoring port 220 is located at the tube wall of the monitoring tube 200, and foreign matter is not easy to enter the monitoring tube 200 through the second monitoring port 220, further reducing the risk of the monitoring tube 200 being completely blocked.

[0024] The first monitoring port 210 and the second monitoring port 220 cannot be too close to each other, so as to avoid the situation where the first monitoring port 210 is blocked and the foreign matter blocking the first monitoring port 210 is too large, causing the foreign matter to block the second monitoring port 220 at the same time. The first monitoring port 210 and the second monitoring port 220 should not be too far apart. If the second monitoring port 220 is too far away from the first monitoring port 210, the second monitoring port 220 is closer to the adapter 300, and the adapter 300 is used to introduce oxygen into the airway 100. The closer the second monitoring port 220 is to the adapter 300, the higher the oxygen concentration around the second monitoring port 220. The sample collected by the second monitoring port 220 cannot reflect the patient's respiratory rate, oxygen concentration, carbon dioxide concentration, etc. Therefore, in some preferred embodiments of the present application, the distance between the first monitoring port 210 and the second monitoring port 220 is between 5 mm and 20 mm. It should be noted that the distance between the first monitoring port 210 and the second monitoring port 220 can be directly the distance of the line connecting the two, or can be the distance between the first monitoring port 210 and the second monitoring port 220 along the axial direction of the monitoring tube 200 .

[0025] In some other preferred embodiments, a side hole 110 is provided on the tube wall of the air guide tube 100 at one end away from the adapter 300. Figure 1 and Figure 2 As shown, the side hole 110 can maintain normal ventilation of the airway tube 100 when one end of the airway tube 100 away from the adapter 300 is blocked. In addition, the side hole 110 can exchange gas with the nasopharyngeal cavity of the human body, which is convenient for the monitoring tube 200 to obtain samples. The monitoring tube 200 is generally located on the side of the side hole 110 close to the adapter 300, further avoiding the risk of foreign matter entering the airway tube 100 from the side hole 110 and blocking the monitoring tube 200. The distance between the side hole 110 and the monitoring tube 200 is limited. Generally, the distance between the side hole 110 and the first monitoring port 210 of the monitoring tube 200 is between 5 mm and 15 mm to ensure that the monitoring tube 200 can collect more accurate samples when the first monitoring port 210 is not easily blocked.

[0026] The airway tube 100 may have only one or more side holes 110 . When there are multiple side holes 110 , the distance between the side hole 110 and the first monitoring port 210 refers to the distance between the side hole 110 closest to the first monitoring port 210 and the first monitoring port 210 .

[0027] During the assembly of the nasopharyngeal airway, attention should be paid to the relative position of the monitoring tube 200 and the airway tube 100, so that the distance between the monitoring tube 200 and the side hole 110 meets the assembly requirements. In order to simplify the assembly process and improve assembly efficiency, in some embodiments of the present application, a limiting structure is provided between the adapter 300 and the monitoring tube 200, so that the adapter 300 and the monitoring tube 200 can cooperate in the axial upper limit of the monitoring tube 200, fix the axial position of the monitoring tube 200, so that the relative position between the monitoring tube 200 and the airway tube 100 meets the assembly requirements.

[0028] Exemplarily, the monitoring tube 200 can be directly fixedly connected to the adapter 300. After the adapter 300 and the airway tube 100 are installed, the monitoring tube 200 and the airway tube 100 are directly assembled in place. However, in this limiting method, the positions of the monitoring tube 200 and the adapter 300 are completely fixed, and the position of the monitoring tube 200 cannot be adjusted according to the actual situation of the patient during subsequent use. Two limiting members 400 can also be set on the tube wall of the monitoring tube 200, refer to Figure 4 As shown, one of the stoppers 400 is fixed to the monitoring tube 200, and then after the monitoring tube 200 passes through the adapter 300, the other stopper 400 is fixed to the monitoring tube 200. The size of the stopper 400 is larger than the channel in the adapter 300 for the monitoring tube 200 to pass through, and the stopper 400 cannot pass through the channel to limit the monitoring tube 200. Under such a layout, when the monitoring tube 200 and the adapter 300 are limited, the monitoring tube 200 can be rotated in the adapter 300 to adjust the direction of the second monitoring port 220. In addition, the distance between the two stoppers 400 can be adjusted farther, so that the stopper 400 can have a certain amount of activity margin in the adapter 300, thereby improving the flexibility and convenience of the nasopharyngeal airway in use.

[0029] The end of the airway tube 100 away from the adapter 300 has a guide portion 120. The guide portion 120 is used to assist the nasopharyngeal airway tube to be inserted into the human body. The outer surface of the guide portion 120 has an arc-shaped guide surface 121, and the guide portion 120 can block part of the tube hole at the end of the airway tube 100. The arc-shaped guide surface 121 has a guiding function. In the process of inserting the nasopharyngeal airway tube into the human body, the arc-shaped guide surface 121 can assist the insertion of the nasopharyngeal airway tube, making the insertion of the nasopharyngeal airway tube smoother, improving the patient's comfort, and not easily damaging the inner wall of the cavity. In addition, after the guide portion 120 blocks part of the tube hole, while ensuring the ventilation effect, it can prevent foreign matter from entering the airway tube 100 from the tube hole at the end of the airway tube 100, causing blockage to the airway tube 100, especially preventing foreign matter adhering to the inner wall of the nasopharyngeal cavity from entering the airway tube 100 during the insertion of the nasopharyngeal airway tube.

[0030] Since the guide portion 120 is disposed at the end of the airway tube 100, it blocks part of the tube hole of the airway tube 100, resulting in a reduction in the size of the opening of the airway tube 100 that can be ventilated, which will affect the ventilation efficiency of the airway tube 100. In this regard, in some preferred embodiments of the present application, an oblique cut 130 is disposed at one end of the airway tube 100 away from the adapter 300, and the oblique cut 130 is used to increase the size of the opening of the airway tube 100 that can be ventilated, thereby reducing or avoiding the influence of the guide portion 120 on the ventilation efficiency of the airway tube 100.

[0031] Exemplarily, the oblique cut 130 passes through the end surface of the airway tube 100, so that the oblique cut 130 is connected to the end opening of the airway tube 100, and the opening size of the airway tube 100 can be expanded. It can be understood that the oblique cut 130 is inclined relative to the axis of the airway tube 100. After the oblique cut 130 passes through the end surface of the airway tube 100, it extends toward the tube wall of the airway tube 100 and passes through the tube wall of the airway tube 100. Since the oblique cut 130 is arranged obliquely, during the use of the nasopharyngeal airway, the probability that the port of the airway tube 100 that is not blocked by the guide portion 120 and the oblique cut 130 are blocked by the cavity wall of the nasopharyngeal cavity at the same time is very small, which is beneficial to prevent the airway 100 from being blocked by the cavity wall.

[0032] Preferably, the oblique cutout 130 and the guide portion 120 are respectively located on the radial sides of the air guide tube 100. Figures 1 to 3 In such a layout, the oblique cut 130 is completely connected with the end of the air guide tube 100 that is not blocked by the guide portion 120, forming a larger vent, thereby improving the ventilation efficiency.

[0033] The nasopharyngeal cavity of the human body has a certain curvature. To adapt to the shape of the nasopharyngeal cavity, the airway tube 100 is bent in the first plane. Figure 3 Taking the direction shown as an example, the first plane is the xy plane, and the airway tube 100 is bent in the xy plane. In the process of inserting the airway tube 100 into the human nasopharyngeal cavity, the operator generally faces the patient in order to observe the position of the nasopharyngeal airway. It can be understood that the position of the airway tube in the left-right direction can be observed by the naked eye, and it is less difficult to control the position of the airway tube 100 in the left-right direction. However, the position of the airway tube 100 in the front-to-back direction is more difficult to observe, and it is more difficult to control the position of the airway tube 100 in the front-to-back direction. The left-right direction is Figure 3 Therefore, during the insertion of the airway tube 100, the portion of the airway tube 100 in the front-to-back direction is more likely to touch the nasopharyngeal cavity wall. It should be noted that the left-right direction and the front-to-back direction are both directions referring to the operator or the patient.

[0034] In some embodiments of the present application, the direction of the oblique cut 130 is arranged to intersect with the first plane. Figure 3As shown, the dotted line b with an arrow represents the direction of the oblique cut 130, and the dotted line b is arranged to intersect with the xy plane. In this way, during the insertion process of the airway tube 100, the oblique cut 130 can be located in the left and right directions of the operator. Only when it is offset in the left and right directions, the oblique cut 130 will have the possibility of contacting the nasopharyngeal wall. However, since the position of the airway tube 100 in the left and right directions is easier to control, the oblique cut 130 almost does not contact the nasopharyngeal wall. In the front-to-back direction, even if the control difficulty of the airway tube 100 is high, it is the guide part 120 at the end of the airway tube 100 that contacts the nasopharyngeal wall. The arc-shaped guide surface 121 of the guide part 120 has a guiding effect and can reduce the patient's discomfort. In this way, it can be avoided that the edge of the oblique cut 130 causes discomfort to the human body, and it can also be avoided that foreign matter attached to the nasopharyngeal wall enters the airway tube 100 from the oblique cut 130 or the end of the airway tube 100.

[0035] If the direction of the oblique cut 130 is parallel to the first plane, it means that the position of the oblique cut 130 is set on the stretched side or the bent side after the airway tube 100 is bent. Under the two layout modes, during the insertion of the airway tube 100, the oblique cut 130 is located in the front-back direction of the operator, and the oblique cut 130 is easy to contact with the nasopharyngeal wall, causing discomfort to the patient, and even causing foreign matter attached to the nasopharyngeal wall to enter the airway tube 100 through the oblique cut 130, causing the airway tube 100 to be blocked.

[0036] And / or, the airway tube 100 includes two parts, a first tube section 150 and a second tube section 160 connected in sequence. The first tube section 150 is arranged closer to the adapter 300 relative to the second tube section 160. It can be understood that the first tube section 150 is closer to the adapter 300, and the second tube section 160 is farther from the adapter 300. Among them, the guide part 120 and the oblique cut 130 are both located in the second tube section 160. The first tube section 150 and the second tube section 160 are integrally injection molded to ensure the connection stability between the two and the structural stability of the airway tube 100, and avoid damage and breakage between the two tube sections. The first tube section 150 and the second tube section 160 need to be inserted into the human body, so the two tube sections are generally made of flexible structures. In some preferred embodiments, the softness of the first tube section 150 is less than the softness of the second tube section 160.

[0037] During the insertion of the airway tube 100, the guide portion 120 is mainly in contact with the nasopharyngeal cavity wall, and the second tube segment 160 is more flexible, which can further reduce the discomfort caused by the insertion of the nasopharyngeal airway tube to the patient. The first tube segment 150 is less flexible, so that the first tube segment 150 can maintain the bent shape after the airway tube 100 is pre-bent, which is convenient for use.

[0038] The adapter 300 can be directly fixedly connected to the airway tube 100, or it can be detachably connected. Since the adapter 300 is generally connected to an oxygen source, after the nasopharyngeal airway is inserted into the human body, in order to better adapt to the setting position of the oxygen source, the position of the adapter 300 is generally adjusted. The airway tube 100 and the adapter 300 are set to be detachably connected, which makes it easier to adjust the position of the adapter 300. Exemplarily, the adapter 300 needs to be rotated at a certain angle, so that the pipeline connected to the oxygen source can be better placed. The adapter 300 is directly pulled out of the airway tube 100, and the position of the adapter 300 is adjusted and then inserted into the airway tube 100 again.

[0039] In some embodiments of the present application, the adapter 300 has a connecting pipe section 340, which is inserted into the air guide tube 100, and the outer diameter of the connecting pipe section 340 gradually decreases along the insertion direction of the connecting pipe section 340. Figure 1 As shown, the connecting pipe section 340 is generally in a conical structure, with a small head size and a large bottom size of the connecting pipe section 340. The connecting pipe section 340 with a conical structure is easier to align with the airway tube 100 during the insertion process of the airway tube 100, and is also easier to insert into the airway tube 100 and engage with the airway tube 100. In addition, the connecting pipe section 340 with a conical structure has a lower precision requirement, and even if the size error is large, the connecting pipe section 340 can still be engaged with the airway tube 100, which reduces the manufacturing difficulty of the connecting pipe section 340.

[0040] The air guide tube 100 is generally further provided with an air source connector 140, which is connected to the first pipe section 150. Figures 1 to 3 Different from the structures of the first pipe section 150 and the second pipe section 160, the gas source connector 140 does not need to be inserted into the human body. The gas source connector 140 is mainly used to connect with the adapter 300. Therefore, the gas source connector 140 can be made of a material with a relatively high hardness such as plastic, so that during the process of separating the gas source connector 140 and the adapter 300, the two can be quickly separated, reducing the difficulty of disassembly.

[0041] Some embodiments of the present application provide a structure of an adapter 300, which can be referred to Figures 4 to 6As shown, the adapter 300 has a first channel 310 and a second channel 320 connected to the airway tube 100. The first channel 310 is used to connect to the oxygen source and provide a flow channel for oxygen. The second channel 320 is used to pass the monitoring tube 200. The inner wall of the second channel 320 is generally also provided with a mounting groove 321, and the mounting groove 321 is used to install the monitoring tube 200, so that the groove wall of the mounting groove 321 limits the monitoring tube 200 to prevent the monitoring tube 200 from moving in the second channel 320. The first channel 310 and the second channel 320 are respectively located on both sides of the radial direction of the adapter 300, so that the adapter 300 is fully utilized. The adapter 300 is connected to the airway tube 100, so the radial direction of the airway tube 100 can be used as the radial direction of the adapter 300.

[0042] In some embodiments of the present application, the adapter 300 further has a merging cavity 330, Figure 4 and Figure 6 As shown. One end of the confluence cavity 330 is the space inside the airway tube 100, and the other end is the first channel 310 and the second channel 320. The confluence cavity 330 is located at the connecting pipe section 340 of the adapter 300. The inner wall of the first channel 310 is tangent to the inner wall of the confluence cavity 330, making full use of the internal space of the adapter 300, and being arranged as close to the edge of the adapter 300 as possible, so as to reserve a larger installation space for the monitoring tube 200.

[0043] The pipe section of the monitoring pipe 200 located outside the air guide pipe 100 is connected to a filter 500, Figure 1 and Figure 2 The filter 500 has a mounting cavity 510 and a filter element 520 located in the mounting cavity 510. The mounting cavity 510 has a filter inlet 511 connected to the monitoring tube 200 and a filter outlet 512 for connecting to the monitoring device. Figures 7 to 9 The gas enters the installation cavity 510 from the filter inlet 511, is filtered by the filter element 520, passes out of the installation cavity 510 through the filter outlet 512, and is then monitored by the monitoring equipment.

[0044] The inner diameter of the installation cavity 510 is larger than the inner diameter of the monitoring tube 200 so as to install a larger filter element 520. During the gas filtering process, the larger filter element 520 has a faster filtering speed and better filtering effect, and the service life of the filter element 520 is also longer.

[0045] A plurality of first support structures 530 arranged around the axis of the filter inlet 511 are connected to the interior of the installation cavity 510. The first support structure 530 is used to support the filter element 520. The plurality of first support structures 530 are arranged around the filter inlet 511, which is conducive to the smooth dispersion of the gas entering the installation cavity 510 from the filter inlet 511 to various parts of the installation cavity 510, and the filter element 520 is fully utilized for filtering. A plurality of second support structures 540 arranged around the filter outlet 512 are also connected to the interior of the installation cavity 510. The second support structure 540 is used to support the filter element 520, and cooperates with the first support structure 530, so that the filter element 520 is pressed tightly between the first support structure 530 and the second support structure 540, and the position of the filter element 520 is stabilized. The plurality of second support structures 540 are arranged around the filter outlet 512, which is conducive to the filtered gas being collected at the filter outlet 512 and discharged through the filter outlet 512.

[0046] The filter 500 generally includes an upper shell 550 and a lower shell 560 that are snap-fitted together, which facilitates the manufacture and assembly of the filter 500. The upper shell 550 and the lower shell 560 both have grooves, and when the two are assembled together, a mounting cavity 510 can be formed between the two. The plurality of first support structures 530 are mounted on one of the upper shell 550 or the lower shell 560, and the plurality of second support structures 540 are mounted on the other.

[0047] Multiple second support structures 540 and multiple first support structures 530 are generally arranged in correspondence, and any corresponding first support structure 530 and second support structure 540 are on the same straight line, so that the filter element 520 is subjected to balanced force, avoiding bending, curling, etc. of the filter element 520 that affect the filtering effect.

[0048] In some embodiments provided in the present application, the first support structure 530 and the second support structure 540 may not correspond to each other. For example, a clamping ring 570 is fixedly sleeved outside the first support structure 530, referring to Figure 8 and Fig. 9As shown. The snap ring 570 can be snapped into the housing corresponding to the second support structure 540, and the snap ring 570 can replace the first support structure 530, cooperate with the second support structure 540 to clamp the filter element 520, and fix the position of the filter element 520. The snap ring 570 is an annular structure, which has a portion corresponding to the second support structure 540. The snap ring 570 cooperates with the second support structure 540 to fix the filter element 520, and will not cause the filter element 520 to be installed unevenly. Under such a layout, the first support structure 530 can be arranged in a non-corresponding manner with the second support structure 540, and along the axial direction of the installation cavity 510, the projections of multiple first support structures 530 and the projections of multiple second support structures 540 are independent of each other. The first support structure 530 and the second support structure 540 are not on the same straight line, nor are they clamped on both sides of the same portion of the filter element 520. The filter element 520 can be fully utilized.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nasopharyngeal ventilation tube, characterized in that: It comprises an airway tube (100), a monitoring tube (200) and an adapter (300); The adapter (300) is arranged at one end of the airway pipe (100); the monitoring pipe (200) passes through the adapter (300) and extends into the airway pipe (100); the pipe section of the monitoring pipe (200) located inside the airway pipe (100) has a first monitoring port (210) and a second monitoring port (220); the first monitoring port (210) is located at the end of the monitoring pipe (200), and the second monitoring port (220) is located on the pipe wall of the monitoring pipe (200).

2. A nasopharyngeal airway according to claim 1, characterized in that: The distance between the first monitoring port (210) and the second monitoring port (220) is between 5 mm and 20 mm; And / or, a side hole (110) is provided on a tube wall of one end of the air guide tube (100) away from the adapter (300), the monitoring tube (200) is located on a side of the side hole (110) close to the adapter (300), and the distance between the side hole (110) and the first monitoring port (210) is between 5 mm and 15 mm.

3. A nasopharyngeal airway according to claim 2, characterized in that: The adapter (300) cooperates with the monitoring tube (200) at the axial upper limit position of the monitoring tube (200).

4. A nasopharyngeal airway according to any one of claims 1 to 3, characterized in that: One end of the air guide tube (100) away from the adapter (300) is provided with a guide portion (120), the guide portion (120) having an arc-shaped guide surface (121), and the guide portion (120) partially covers the tube hole at the end of the air guide tube (100).

5. A nasopharyngeal airway according to claim 4, characterized in that: One end of the air guide tube (100) away from the adapter (300) has an oblique cut (130) penetrating the end surface of the air guide tube (100), and the oblique cut (130) and the guide portion (120) are respectively located on two radial sides of the air guide tube (100).

6. A nasopharyngeal airway according to claim 5, characterized in that: The air guide tube (100) is bent in a first plane, and the direction of the oblique cut (130) intersects with the first plane; And / or, the air guide tube (100) comprises a first tube section (150) and a second tube section (160) which are connected in sequence, the first tube section (150) is closer to the adapter (300) relative to the second tube section (160), the guide portion (120) and the oblique cut (130) are both located in the second tube section (160), the first tube section (150) and the second tube section (160) are integrally injection-molded and connected, and the softness of the first tube section (150) is less than the softness of the second tube section (160).

7. A nasopharyngeal airway according to claim 1, characterized in that: The adapter (300) has a connecting pipe section (340), the connecting pipe section (340) is inserted into the air guide tube (100), and along the insertion direction of the connecting pipe section (340), the outer diameter of the connecting pipe section (340) gradually decreases.

8. A nasopharyngeal airway according to claim 1, characterized in that: The adapter (300) has a first channel (310) and a second channel (320) which are connected to the airway tube (100), the first channel (310) being used to connect to an oxygen source, and the second channel (320) being used to pass through the monitoring tube (200), wherein: The inner wall of the second channel (320) is provided with a mounting groove (321), and the groove wall of the mounting groove (321) is limitedly matched with the monitoring tube (200); and / or the second channel (320) and part of the first channel (310) are respectively located on two radial sides of the adapter (300).

9. A nasopharyngeal airway according to claim 1, characterized in that: The pipe section of the monitoring pipe (200) located outside the air guide pipe (100) is connected to a filter (500), the filter (500) having an installation cavity (510) and a filter element (520) installed in the installation cavity (510), the installation cavity (510) having a filter inlet (511) connected to the monitoring pipe (200) and a filter outlet (512) for connecting to a monitoring device, and the inner diameter of the installation cavity (510) is larger than the inner diameter of the monitoring pipe (200); The installation cavity (510) is connected to a plurality of first support structures (530) arranged around the axis of the filter inlet (511) and a plurality of second support structures (540) arranged around the filter outlet (512); the plurality of first support structures (530) and the plurality of second support structures (540) are respectively located on both sides of the filter element (520) and abut against the filter element (520).

10. A nasopharyngeal airway according to claim 9, characterized in that: The filter (500) comprises an upper shell (550) and a lower shell (560) which are arranged in a snap-connected manner, the installation cavity (510) is formed between the upper shell (550) and the lower shell (560), the plurality of first support structures (530) are installed on one of the upper shell (550) and the lower shell (560), and the plurality of second support structures (540) are installed on the other; The outer fixing sleeves of the multiple first support structures (530) are provided with a clamping ring (570), and the clamping ring (570) is used to be clamped into the shell corresponding to the second support structure (540). The clamping ring (570) can cooperate with the second support structure (540) to clamp the filter element (520), and along the axial direction of the installation cavity (510), the projections of the multiple first support structures (530) and the projections of the multiple second support structures (540) are independent of each other.

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