CN118718196A - An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure - Google Patents

Abstract

The present invention discloses an oropharyngeal ventilation device for monitoring the end-tidal carbon dioxide partial pressure, and relates to the technical field of medical auxiliary appliances. At present, in the medical process using the oropharyngeal airway, the oropharyngeal airway is usually fixed to the face of the person using tape, which is inconvenient to fix the ventilation tube. After the ventilation tube is placed in the patient's mouth, there is no locking structure, and the oropharyngeal airway usually falls off from the patient's mouth in clinical practice. The present invention provides an oropharyngeal ventilation device for monitoring the end-tidal carbon dioxide partial pressure, including a ventilation tube, and also including a pharyngeal air bag, which is sleeved on the ventilation tube; a supplementary tube, which is used to monitor the end-tidal carbon dioxide partial pressure; an occlusal body, in which an arched air bag is arranged, and an upper occlusal part is arranged above the arched air bag. When the upper occlusal part squeezes the arched air bag, the arched air bag is inflated to the pharyngeal air bag through a preset inflation tube; friction limit components are arranged on both sides of the upper occlusal part.

Description

An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure

Technical Field

The invention relates to the technical field of medical auxiliary appliances, and in particular to an oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure.

Background Art

Oropharyngeal airway, also known as oropharyngeal airway, is a non-tracheal tube non-invasive ventilation tube that can prevent the tongue from falling back, quickly open the airway, and establish a temporary artificial airway. For anesthetized or comatose patients, due to the relaxation of the floor of the mouth and pharyngeal muscles that support the tongue to maintain the upper airway, the tongue and epiglottis can fall back into the posterior pharyngeal wall, resulting in upper airway obstruction.

When the oropharyngeal airway is correctly inserted, its front end can lift the tongue and epiglottis from the posterior pharyngeal wall, thereby preventing or treating upper airway obstruction. Compared with other methods of maintaining upper airway patency (such as chin lift, jaw support and endotracheal intubation), the insertion of the oropharyngeal airway does not affect the stability of the patient's cervical spine, so the oropharyngeal airway is widely used and easy to operate.

However, in the current medical process of using oropharyngeal airways, tape is usually used to fix the oropharyngeal airway to the person's face, which is not convenient for fixing the airway. After the airway is placed in the patient's mouth, there is no locking structure, and the oropharyngeal airway often falls off the patient's mouth in clinical practice. At the same time, there is also the phenomenon that inserting the oropharyngeal airway first and then inserting the suction tube can easily cause secondary injury to the patient, increasing the patient's pain.

At the same time, we found that the existing oropharyngeal airway does not have a carbon dioxide monitoring function. For patients who are not fully awake or in a coma after anesthesia, intuitive carbon dioxide monitoring can effectively reflect the patient's respiratory function, so that medical staff can promptly detect changes in the patient's condition and take corresponding measures in time, greatly improving medical safety.

After searching, a Chinese patent with the announcement number CN109224230B proposes an oropharyngeal ventilation device; including a fixed tube, one end of which is connected to a mask, and a pharyngeal airbag is provided on the tube wall of the other end, and the end of the fixed tube connected to the mask passes through the mask; two tooth pads are provided on the end surface of the mask close to the pharyngeal airbag. The present invention provides a new oropharyngeal ventilation device, which has a long retention time and is not easy to shift; the fixed tube is automatically fixed in the oral cavity through the simultaneous action of the airbag inside the teeth and the pharyngeal airbag, without the need for external fixation, which effectively improves the overall firmness of the device, thereby reducing the workload of medical staff, and at the same time, increases the comfort of patients and avoids the occurrence of allergies; the device has a simple structure, is easy to use, is convenient for medical staff to operate, improves work efficiency, and is suitable for wide promotion and use.

The above device inflates the airbags inside the teeth and the pharyngeal airbags through an inflation handle. After the two airbags are inflated, they can be fixed in the oral cavity, but the overall operation is cumbersome.

Summary of the invention

In response to the above-mentioned problems, the present invention aims to provide an oropharyngeal ventilation device for monitoring the end-tidal carbon dioxide partial pressure, designing a pharyngeal airbag that can simplify the inflation operation of the airbag; designing a mouth fixing device so that the fixing tube is automatically fixed in the oral cavity without the need for external fixation; and designing a carbon dioxide monitoring tube to facilitate the detection of changes in the patient's condition.

The main idea of the technical solution adopted in the present invention is as follows: by designing a ventilation tube with a supplementary tube, medical staff can monitor the end-tidal carbon dioxide partial pressure through the supplementary tube, or perform sputum suction through the supplementary tube; a mouth fixing structure is sleeved on the ventilation tube, and a bite portion is arranged on the upper and lower sides of the mouth fixing structure, and an arched air bag is arranged inside. When the upper bite portion is pressed down, the arched air bag is squeezed, thereby achieving inflation of the pharyngeal air bag, and thus making the ventilation tube not easy to fall off; slidingly connected support members are arranged on the left and right sides of the mouth fixing structure. When the upper bite portion is pressed down to squeeze the arched air bag, the air pressure of the arched air bag increases, and the gas pushes the support member to slide outward, and the support member presses against the inner wall of the oral cavity to further achieve fixation.

In order to achieve the above object, the technical solution adopted by the present invention is as follows:

An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure, comprising a ventilation tube, and further comprising:

Pharyngeal air bag, which is placed on the ventilation tube;

A supplementary tube, which is placed inside the ventilation tube and is used to monitor the end-tidal carbon dioxide partial pressure;

The bite body is sleeved on the ventilation tube. When the patient bites the bite body, the pharyngeal air bag (3) is inflated and expanded.

Through the above technical solution, further: an arched airbag is arranged inside the occlusal body, an upper occlusal part is arranged above the arched airbag, and when the upper occlusal part squeezes the arched airbag, the arched airbag inflates the pharyngeal airbag through a preset inflation tube.

Through the above technical scheme, further: friction limit components are arranged on both sides of the upper bite part. When the upper bite part squeezes the arch airbag, the arch airbag is inflated and pressurized toward the friction limit component through the air hole. Under the action of negative pressure, the friction limit component presses the upper bite part, so that the upper bite part maintains the state of squeezing the arch airbag.

Through the above technical solution, further: ventilation grooves are arranged on both sides of the upper bite part, the arched airbag is inflated into the ventilation groove through the air hole, and the friction limit assembly includes a friction block pressed against the upper bite part.

Through the above technical solution, further: the friction limit assembly also includes a fixing ring fixedly connected to the inner wall of the ventilation groove, and a second spring is connected between the fixing ring and the friction block.

Through the above technical solution, further: the upper engaging portion includes a control seat and an operating seat which are sleeved together, the operating seat includes an operating rod and an upper support plate and a lower support plate at both ends of the operating rod, and the control seat can slide up and down on the operating rod.

Through the above technical solution, further: a spring 1 is arranged between the lower support plate and the control seat.

Through the above technical solution, further: support holes are respectively opened on both sides of the engaging body, support members are slidably connected in the support holes, and the support holes are three-phase connected with the air holes of the arched airbag.

Through the above technical solution, further: a threaded interface is provided at one end of the supplementary pipe.

Through the above technical solution, further: an air release valve is provided on the bite body.

The beneficial effects of the present invention are:

1. By designing a ventilation tube with a supplementary tube, medical staff can monitor the end-tidal carbon dioxide partial pressure through the supplementary tube, or perform sputum suction through the supplementary tube; it can improve the accuracy of respiratory monitoring, and then reflect the patient's respiratory function and pulmonary blood flow, which is of great significance for evaluating the patient's condition, guiding treatment and preventing complications;

2. A mouth fixing structure is sleeved on the ventilating tube, and a bite portion is arranged on the upper and lower sides of the mouth fixing structure, and an arched air bag is arranged inside. When the upper bite portion is pressed down, the arched air bag is squeezed, thereby inflating the pharyngeal air bag, thereby preventing the ventilating tube from falling off;

3. Sliding support members are provided on the left and right sides of the mouth fixing structure. When the upper occlusal part presses down to squeeze the arched airbag, the air pressure of the arched airbag increases, and the gas pushes the support member to slide outward, and the support member presses against the inner wall of the oral cavity to further achieve fixation;

4. When the upper occlusal part is pressed downward, the arched airbag is inflated and pressurized toward the friction limit assembly through the air hole. Under the action of negative pressure, the friction limit assembly presses against the upper occlusal part, so that the upper occlusal part keeps squeezing the arched airbag until the air is deflated through the deflation valve to cancel the negative pressure state. This fixing method has a simple structure and good effect. The pressure of the airbag inflation is moderate, the patient is not tired, and it is convenient for the subsequent surgical process.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

FIG2 is a schematic diagram of a three-dimensional structure of the present invention from another angle;

FIG3 is a schematic diagram of the three-dimensional structure of the occlusal body of the present invention;

FIG4 is a schematic diagram of the three-dimensional structure of the upper engaging portion, the arched airbag, and the friction limiter assembly of the present invention;

FIG5 is a schematic diagram of the three-dimensional structure of the connection relationship of the arched airbag of the present invention;

FIG6 is an enlarged schematic diagram of a portion of the structure of FIG5;

FIG7 is a schematic diagram of the three-dimensional structure of the upper occlusal portion of the present invention;

FIG8 is a schematic top view of the occlusal body of the present invention;

FIG9 is a schematic cross-sectional view of FIG8A-A;

FIG10 is a schematic diagram of the three-dimensional structure of the connection relationship of the inflation tube of the present invention;

FIG11 is a schematic diagram of the three-dimensional structure of the connection relationship between the ventilation pipe and the inflation pipe of the present invention;

FIG12 is a schematic rear view of the occlusal body of the present invention;

FIG13 is a schematic cross-sectional view of FIG12B-B;

Among them: 1. Ventilation pipe;

2. Occlusal body;

21, upper occlusal part; 211, control seat; 2111, control rod; 2112, control board; 2113, positioning block; 212, operating seat; 2121, control rod; 2122, upper support plate; 2123, lower support plate; 213, spring 1;

22, arched airbag; 221, air hole 1; 222, air hole 2; 223, air hole 3;

23. Ventilation groove; 24. Friction limit assembly; 241. Friction block; 242. Spring 2; 243. Fixing ring;

25. Support member; 26. Lower occlusal part; 27. Support hole; 3. Pharyngeal air bag; 4. Inflation tube; 5. Supplementary tube; 6. Deflation valve.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

The inventors have found that in the current medical procedures using oropharyngeal airways, tape is usually used to fix the oropharyngeal airway to the person's face, which is inconvenient to fix the airway. After the airway is placed in the patient's mouth, there is no locking structure, and the oropharyngeal airway often falls off the patient's mouth in clinical practice. At the same time, there is also the phenomenon that inserting the oropharyngeal airway first and then the suction tube can easily cause secondary damage to the patient, increasing the patient's pain.

Based on the above findings, the present application proposes an oropharyngeal ventilation device for monitoring the end-tidal carbon dioxide partial pressure. By designing a ventilation tube with a supplementary tube, medical staff can monitor the end-tidal carbon dioxide partial pressure through the supplementary tube, or perform sputum suction through the supplementary tube; a mouth fixing structure is sleeved on the ventilation tube, and a bite portion is arranged on the upper and lower sides of the mouth fixing structure, and an arched air bag is arranged inside. When the upper bite portion is pressed down, the arched air bag is squeezed, thereby achieving inflation of the pharyngeal air bag, and thus making the ventilation tube not easy to fall off; slidingly connected support members are arranged on the left and right sides of the mouth fixing structure. When the upper bite portion is pressed down to squeeze the arched air bag, the air pressure in the arched air bag increases, and the gas pushes the support member to slide outward, and the support member presses against the inner wall of the oral cavity to further achieve fixation.

Embodiment 1

Referring to Figures 1 to 13, the present application discloses an oropharyngeal ventilation device for monitoring the end-tidal carbon dioxide partial pressure, including a ventilation tube 1. The ventilation tube 1 is a structure with open ends, an elliptical hollow plastic tube made of elastic rubber or plastic, and is curved as a whole. Its curvature is similar to that of the tongue and soft palate, making it easy to insert.

A mouth fixing structure is sleeved on the vent 1, and the mouth fixing structure includes a bite body 2. The bite body 2 is an elliptical cylinder, one end of which is integrally connected to a horizontal support platform, and the bite body 2 is axially provided with a circular through hole, which is adapted to the outer diameter of the vent 1. The bite body 2 is provided with an upper bite part 21 and a lower bite part 26 on the upper and lower sides, respectively, wherein the upper bite part 21 is provided on the support platform, and the lower bite part 26 is provided at an end opposite to the support platform, and the lower bite part 26 is a groove for placing teeth.

The upper engaging portion 21 includes a control seat 211 and an operating seat 212 which are sleeved together. The operating seat 212 includes an operating rod 2121. The upper and lower ends of the operating rod 2121 are respectively connected to an upper support plate 2122 and a lower support plate 2123. The control seat 211 includes a control rod 2111. The upper end of the control rod 2111 is connected to an arc-shaped control plate 2112. The arc-shaped opening of the control plate 2112 faces downward. A receiving hole is provided at the center of the control seat 211. The shape of the receiving hole matches the shape of the operating rod 2121. The control seat 211 can slide up and down on the operating rod 2121. A spring 213 is sleeved at the bottom of the operating rod 2121. One end of the spring 213 is fixedly connected to the lower support plate 2123, and the other end is fixedly connected to the bottom of the control rod 2111. In the initial state, the spring 1 213 provides a certain amount of support to the control seat 211 , so that the control seat 211 is separated from the lower support plate 2123 . At this time, the height of the upper support plate 2122 is higher than that of the control plate 2112 .

The bottom of the lower support plate 2123 is provided with an arched airbag 22, which is a symmetrical structure, and the lower support plate 2123 is arranged at the center. The arched airbag 22 is arranged in the arched groove inside the engaging body 2, and a long strip-shaped receiving groove is opened above the arched groove, and the receiving groove is connected to the arched groove. Four positioning blocks 2113 are integrally connected to the bottom of the control rod 2111, which contact with the upper surface of the receiving groove to limit the position, and the bottoms of the control seat 211 and the operating seat 212 are both located in the receiving groove.

Two L-shaped ventilation grooves 23 are provided on the left and right sides of the receiving groove. The ventilation grooves 23 are symmetrically arranged and are respectively located at the upper left and upper right of the receiving groove. The ventilation groove 23 is connected to the arched groove. A friction limit assembly 24 is arranged in the ventilation groove 23, including a friction block 241 in contact with the control rod 2111. The end of the friction block 241 away from the control rod 2111 is connected to a spring 242. The other end of the spring 242 is connected to a fixed ring 243. The fixed ring 243 is fixed on the inner wall of the ventilation groove 23 and is on the same plane as the friction block 241. The friction block 241 slides in the left and right directions in the ventilation groove 23. Two symmetrical air holes 221 are provided on the arched airbag 22, which are respectively located at the ends of the two ventilation grooves 23. The air holes 221 are arranged for one-way ventilation, and the air can only be ejected outward by the arched airbag 22. When the air hole 1 221 sprays air, it can overcome the resistance of the spring 242, so that the friction block 241 presses the control rod 2111. The control rod 2111 is pressed by the friction blocks 241 on the left and right sides, so that the control rod 2111 is fixed at the current position.

The left and right sides of the bite body 2 are provided with support holes 27, and the support member 25 is slidably connected in the support hole 27. The support hole 27 includes a limit groove located on the outside and a sliding groove close to the inside. The limit groove and the sliding groove are coaxially arranged, and the sliding groove has a larger diameter and a smaller diameter. The support member 25 includes three parts connected in one piece, the outside is an arc-shaped fixed plate, the middle is a sliding rod 1 adapted to the inner diameter of the limit groove, and the inside is a sliding rod 2 adapted to the inner diameter of the sliding groove. The diameter of the sliding rod 2 is larger than the inner diameter of the limit groove to prevent the support member 25 from falling off. The support hole 27 is connected to the arched groove, and the arched airbag 22 is provided with two symmetrical air holes 222, which are respectively located on the inner sides of the two support holes 27. When the air holes 222 spray, they can overcome the friction resistance of the support member 25, so that the support member 25 slides outward and presses against the inner wall of the oral cavity, so that the bite body 2 is fixed in the current position. The diameter of the air hole 222 is larger than the air hole 1 221.

The arched airbag 22 is also provided with a third air hole 223 for inflating the pharyngeal airbag 3 sleeved on the ventilating tube 1. A connecting hole is provided on the inner wall of the occlusal body 2, and the inflating tube 4 passes through the connecting hole and is connected to the third air hole 223, and the other end of the inflating tube 4 is connected to the air inlet of the pharyngeal airbag 3. The diameter of the third air hole 223 is larger than the first air hole 221, and the thickness of the arched airbag 22 is relatively thick, so it can store more gas.

When the patient uses the device, the bite body 2 is placed in the mouth, and the upper bite part 21 and the lower bite part 26 on the upper and lower sides correspond to the positions of the patient's upper teeth and lower teeth respectively; the patient's teeth bite, so that the upper bite part 21 moves downward, squeezing the arched airbag 22, and the arched airbag 22 sprays outwards through the air hole 1 221, the air hole 222 and the air hole 3 223. When the air hole 222 sprays, it can overcome the friction resistance of the support member 25, so that the support member 25 slides outwards and presses against the inner wall of the oral cavity, so that the bite body 2 is fixed in the current position to avoid falling off during operation; when the air hole 3 223 sprays, the pharyngeal airbag 3 is inflated through the inflation tube 4, so that the pharyngeal The airbag 3 is inflated and the vent tube 1 is fixed in this position; the air hole 221 sprays air outward, and when the pressure in the vent groove 23 is large enough, it can overcome the resistance of the spring 242, so that the friction block 241 presses against the control rod 2111, and the control rod 2111 is subjected to the pressure of the friction blocks 241 on the left and right sides, so that the control rod 2111 is fixed in the current position, so that the arched airbag 22 can remain in a squeezed state for a certain period of time, and because the diameter of the air hole 221 is small, the pressure will not reach the requirement until the first two steps are completed, so that the upper bite part 21 remains in a state of squeezing the arched airbag 22, which can ensure the stability of the vent tube 1 during operation.

Embodiment 2

Referring to Figures 1, 2, and 11-13, a supplementary tube 5 is provided in the ventilation tube 1. A threaded interface is provided at one end of the supplementary tube 5, which can be connected to a carbon dioxide testing instrument and can also be used to connect a negative pressure device for suctioning sputum.

In order to cancel the fixation after the operation is completed, a deflation valve 6 is provided on the bite body 2. The deflation valve 6 adopts an existing structure, and no specific model is specified here, as long as it can satisfy the deflation. A Y-shaped groove connected to the ventilation grooves 23 on both sides is provided on the bite body 2, and a deflation valve 6 is provided at the end of the Y-shaped groove. When deflation and disassembly are required, the deflation valve 6 is pressed to reduce the pressure in the ventilation groove 23, cancel the negative pressure state, and the friction block 241 no longer presses the control rod 2111, so that the upper bite part 21 is restored to the initial state by the action of the spring 1 213, and the upper bite part 21 no longer presses the arched airbag 22, and the gas in the pharyngeal airbag 3 returns to the arched airbag 22 through the inflation tube 4, and the support member 25 slides inward, and part of the gas in the support hole 27 returns to the arched airbag 22.

Embodiment 3

The present invention is applicable to the patient's respiratory monitoring, and its specific use process is as follows:

1. Select an appropriate ventilator tube1, the length of which (outside the mouth) is approximately equal to the length from the incisors to the angle of the mandible.

2. Open the patient's mouth, place a tongue retractor at the base of the tongue, and lift the tongue upward to clear the posterior pharyngeal wall.

3. Place the ventilation tube 1 into the oral cavity, with the tip protruding 1 to 2 cm beyond the incisors. At this point, the ventilation tube 1 is about to reach the posterior wall of the oropharynx.

4. Lift the lower jaw with both hands to make the tongue leave the posterior pharyngeal wall, and then use the thumb to push the ventilation tube 1 downward at least 2 cm so that the pharyngeal curvature of the airway is located behind the root of the tongue.

5. Relax the mandibular condyle and allow it to retract into the temporomandibular joint.

6. Check the oral cavity and make the upper occlusal part 21 and the lower occlusal part 26 on the upper and lower sides correspond to the positions of the patient's upper teeth and lower teeth respectively; the patient's teeth occlude to make the upper occlusal part 21 move downward to squeeze the arched airbag 22, and the arched airbag 22 ejects air outwards through the air hole 1 221, the air hole 222 and the air hole 3 223. When the air hole 222 ejects air, it can overcome the friction resistance of the support member 25, so that the support member 25 slides outwards and presses against the inner wall of the oral cavity, so that the occlusal body 2 is fixed in the current position to avoid falling off during operation; when the air hole 3 223 ejects air, the pharyngeal airbag 3 is inflated through the inflation tube 4, so that the pharyngeal airbag 3 bulges and ventilation is performed. The tube 1 is fixed in this position; the air hole 221 sprays air outward, and when the pressure in the ventilation groove 23 is large enough, it can overcome the resistance of the spring 242, so that the friction block 241 presses against the control rod 2111, and the control rod 2111 is subjected to the pressure of the friction blocks 241 on the left and right sides, so that the control rod 2111 is fixed in the current position, so that the arched airbag 22 can remain in a squeezed state for a certain period of time, and because the diameter of the air hole 221 is small, the pressure will not reach the requirement until the first two steps are completed, so that the upper bite part 21 remains in a state of squeezing the arched airbag 22, which can ensure the stability of the ventilation tube 1 during operation.

7. When deflation and disassembly are required, the deflation valve 6 is pressed to reduce the pressure in the vent groove 23, cancel the negative pressure state, and the friction block 241 no longer presses the control rod 2111, so that the upper bite part 21 is restored to the initial state by the action of the spring 1 213, and the upper bite part 21 no longer presses the arched airbag 22, and the gas in the pharyngeal airbag 3 returns to the arched airbag 22 through the inflation tube 4, and the support member 25 slides inward, and part of the gas in the support hole 27 returns to the arched airbag 22. Then, the vent tube 1 and the bite body 2 are taken out.

The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (10)

1. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure, comprising a ventilation tube (1), characterized in that it also includes: A pharyngeal air bag (3) is sleeved on the ventilating tube (1); A supplementary tube (5) is arranged inside the ventilation tube (1) and is used to monitor the end-tidal carbon dioxide partial pressure; The bite body (2) is sleeved on the ventilation tube (1), and when the patient bites the bite body, the pharyngeal air bag (3) is inflated and expanded. 2. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 1, characterized in that: an arched air bag (22) is arranged inside the occlusal body (2), and an upper occlusal portion (21) is arranged above the arched air bag (22), and when the upper occlusal portion (21) squeezes the arched air bag (22), the arched air bag (22) inflates the pharyngeal air bag (3) through a preset inflation tube (4). 3. An oropharyngeal ventilation device for monitoring the end-tidal carbon dioxide partial pressure according to claim 2, characterized in that: friction limit components (24) are arranged on both sides of the upper bite part (21), and when the upper bite part (21) squeezes the arched airbag (22), the arched airbag (22) is inflated and pressurized toward the friction limit component (24) through the opened air hole 1 (221), and under the action of negative pressure, the friction limit component (24) presses the upper bite part (21), so that the upper bite part (21) keeps squeezing the arched airbag (22). 4. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 3, characterized in that: ventilation grooves (23) are arranged on both sides of the upper bite portion (21), the arched airbag (22) is inflated into the ventilation groove (23) through air hole 1 (221), and the friction limit assembly (24) includes a friction block (241) pressed against the upper bite portion (21). 5. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 4, characterized in that: the friction limit assembly (24) further comprises a fixing ring (243) fixedly connected to the inner wall of the ventilation groove (23), and a second spring (242) is arranged between the fixing ring (243) and the friction block (241). 6. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 5, characterized in that: the upper occlusal portion (21) comprises a control seat (211) and an operating seat (212) which are sleeved together, the operating seat (212) comprises a joystick (2121) and an upper support plate (2122) and a lower support plate (2123) at both ends of the joystick (2121), and the control seat (211) can slide up and down on the joystick (2121). 7. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 6, characterized in that a spring 1 (213) is provided between the lower support plate (2123) and the control seat (211). 8. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 2, characterized in that: support holes (27) are respectively opened on both sides of the occlusal body (2), a support member (25) is slidably connected in the support hole (27), and the support hole (27) is connected to the air hole three (223) of the arched air bag (22). 9. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 1, characterized in that: a threaded interface is provided at one end of the supplementary tube (5). 10. An oropharyngeal ventilation device for monitoring end-tidal carbon dioxide partial pressure according to claim 1, characterized in that a deflation valve (6) is provided on the bite body (2).