Sleeve assembly for trachea

Abstract

The invention discloses a cannula assembly for a trachea. The cannula assembly for the trachea comprises a first cannula and a second cannula, the first sleeve is sleeved with the first sleeve, the second sleeve is sleeved with the first sleeve, a clamping groove is formed in the inner wall of the first sleeve, an elastic buckle is arranged on the peripheral wall of the second sleeve, and the elastic buckle is matched with the clamping groove in a clamped mode; the annular air bag is arranged on the first sleeve in a sleeving mode, an air channel is formed in the wall of the first sleeve, the air channel is provided with an air inlet and an air outlet, the air inlet and the air outlet are both formed in the peripheral wall of the first sleeve, and the air outlet is communicated with the annular air bag. According to the cannula assembly for the trachea, the second cannula can be taken out independently so as to be cleaned and replaced conveniently, then air can be injected into the air channel through the air inlet so that the annular air bag can be inflated, bleeding in an operation area can be prevented from flowing to the lung, and potential safety hazards are reduced.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to a cannula assembly for trachea. Background Technology

[0002] Currently, patients who have undergone laryngeal cancer surgery or tracheotomy due to tracheal invasion need to wear a tracheostomy tube for a long time to maintain airway patency; however, existing products have significant shortcomings.

[0003] Traditional metal cannulas lack a cuff, meaning that if there is sudden bleeding in the laryngeal surgical area post-surgery, blood can flow directly into the lungs through the tracheostomy, leading to airway obstruction, respiratory distress, or even suffocation. Furthermore, during resuscitation, blood may have already entered the lower respiratory tract, increasing the difficulty of treatment and raising the mortality rate. Additionally, metal cannulas can interfere with CT and MRI scans, requiring temporary extubation, which increases airway risks.

[0004] However, existing cannula assemblies mostly employ a single design: either "with a cuff but no inner core" or "with an inner core but no cuff." Cannulas with a cuff but no inner core are prone to sputum and blood clots adhering to the inner wall, requiring complete removal during cleaning, which carries a significant operational risk. Cannulas with an inner core but no cuff cannot prevent bleeding from the surgical area from flowing into the lungs, still posing a risk of suffocation. In summary, existing products are insufficient to meet the multiple needs of postoperative emergency hemostasis and daily prevention of blockage. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a tracheal cannula assembly, in which a second cannula can be removed separately for cleaning and replacement. Furthermore, an annular balloon is fitted onto a first cannula. A gas channel is provided within the wall of the first cannula, with an inlet and an outlet both located on the outer peripheral wall of the first cannula. The outlet communicates with the annular balloon. Thus, air can be injected into the gas channel through the inlet to inflate the annular balloon, thereby preventing bleeding from the surgical area from flowing into the lungs and reducing safety risks.

[0006] According to an embodiment of the present invention, a tracheal cannula assembly includes: a first cannula; a second cannula, wherein the first cannula is sleeved on the second cannula, the inner wall of the first cannula is provided with a groove, and the outer peripheral wall of the second cannula is provided with an elastic buckle, the elastic buckle engaging with the groove; and an annular airbag, wherein the annular airbag is sleeved on the first cannula, the first cannula having a gas channel within its wall, the gas channel having an inlet and an outlet, both the inlet and the outlet being located on the outer peripheral wall of the first cannula, the outlet communicating with the annular airbag.

[0007] According to an embodiment of the present invention, a tracheal cannula assembly has a first internal thread on the inner wall of the first cannula and a first external thread on the outer peripheral wall of the second cannula. The first internal thread and the first external thread are threaded together, so that the first cannula and the second cannula are detachably connected. This allows the patient to remove the second cannula separately for cleaning and replacement without removing the first cannula during use. Furthermore, an annular balloon is fitted onto the first cannula. A gas channel is provided within the wall of the first cannula, and the gas channel has an inlet and an outlet. Both the inlet and outlet are located on the outer peripheral wall of the first cannula, and the outlet communicates with the annular balloon. Thus, air can be injected into the gas channel through the inlet to inflate the annular balloon, thereby preventing bleeding from the surgical area from flowing into the lungs and reducing safety risks.

[0008] According to some embodiments of the present invention, a tracheal cannula assembly further includes: a switching valve and a pressure indicating balloon, wherein the switching valve is disposed at the air inlet, the pressure indicating balloon is disposed in the first cannula and communicates with the annular balloon, and the pressure indicating balloon is provided with a pressure detection device.

[0009] According to some embodiments of the present invention, in a tracheal cannula assembly, the indicating balloon is provided with a selectively openable vent.

[0010] According to some embodiments of the present invention, a tracheal cannula assembly has a first cannula provided with a groove, and at least a portion of the annular airbag is located within the groove.

[0011] According to some embodiments of the present invention, in a tracheal cannula assembly, the width of the slot is greater than the axial dimension of the annular airbag, and the bottom wall of the slot is provided with a second external thread, the annular airbag is provided with a second internal thread, and the second internal thread and the second external thread are threadedly engaged.

[0012] According to some embodiments of the present invention, in a tracheal cannula assembly, the air outlet is disposed on the side wall of the slot.

[0013] According to some embodiments of the present invention, in a tracheal cannula assembly, the outer peripheral wall of the second cannula near the end of the annular airbag is provided with a chamfer.

[0014] According to some embodiments of the present invention, a tracheal cannula assembly has an openable flap at the end of the first cannula away from the annular airbag, the flap being used to open or close the port of the first cannula.

[0015] According to some embodiments of the present invention, the tracheal cannula assembly further includes a fixing structure, the fixing structure including an adhesive tape and two binding straps, the adhesive tape being fixedly sleeved on the first cannula, the two binding straps being respectively disposed on opposite sides of the adhesive tape, and the free ends of the two binding straps being adapted for bonding.

[0016] According to some embodiments of the present invention, the first cannula and / or the second cannula are made of medical-grade polycarbonate or medical-grade polypropylene.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a cannula assembly for a trachea according to some embodiments of this application; Figure 2 This is a schematic diagram of a first sleeve, a second sleeve, and an annular airbag according to some embodiments of this application; Figure 3 This is a partial exploded view of a cannula assembly for a trachea according to some embodiments of this application; Figure 4 This is a cross-sectional view of a cannula assembly for a trachea according to some embodiments of this application.

[0019] Figure label: 100 for use in trachea; First sleeve 10; First internal thread 11; Air outlet 12; Slot 13; Second external thread 131; Second sleeve 20; First external thread 21; Chamfer 22; Elastic snap 23; 30 ring-shaped airbag; 40 pressure-indicating balloon; 41 vent. Flip cover 50, connecting rope 51, fixing structure 60; adhesive tape 61, binding tape 62. Detailed Implementation

[0020] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0021] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0022] Currently, patients who have undergone laryngeal cancer surgery or tracheotomy due to tracheal invasion need to wear a tracheostomy tube for a long time to maintain airway patency; however, existing products have significant shortcomings.

[0023] Traditional metal cannulas lack a cuff, meaning that if there is sudden bleeding in the laryngeal surgical area post-surgery, blood can flow directly into the lungs through the tracheostomy, leading to airway obstruction, respiratory distress, or even suffocation. Furthermore, during resuscitation, blood may have already entered the lower respiratory tract, increasing the difficulty of treatment and raising the mortality rate. Additionally, metal cannulas can interfere with CT and MRI scans, requiring temporary extubation, which increases airway risks.

[0024] However, existing cannula assemblies mostly employ a single design: either "with a cuff but no inner core" or "with an inner core but no cuff." Cannulas with a cuff but no inner core are prone to sputum and blood clots adhering to the inner wall, requiring complete removal during cleaning, which carries a significant operational risk. Cannulas with an inner core but no cuff cannot prevent bleeding from the surgical area from flowing into the lungs, still posing a risk of suffocation. In summary, existing products are insufficient to meet the multiple needs of postoperative emergency hemostasis and daily prevention of blockage.

[0025] In response, this application proposes a tracheal cannula assembly 100, which is described below in conjunction with the appendix. Figure 1-4 This application describes a cannula assembly 100 for a trachea according to an embodiment of the present application.

[0026] like Figure 1 As shown, the tracheal cannula assembly 100 according to an embodiment of the present invention includes: a first cannula 10, a second cannula 20, and an annular airbag 30.

[0027] The first sleeve 10 is fitted onto the second sleeve 20, such as Figure 2As shown, the inner wall of the first sleeve 10 is provided with a groove (not shown in the figure), and the outer peripheral wall of the second sleeve 20 is provided with an elastic buckle 23. The elastic buckle 23 engages with the groove, thus achieving a stable connection when the two are engaged. This not only ensures the integrity and strength of the overall component structure but also significantly improves its reliability and durability in practical applications. Furthermore, an annular airbag 30 is fitted around the outer periphery of the first sleeve 10. The main function of this airbag is to inflate it during clinical use, thereby effectively and reliably fixing the sleeve in the position within the trachea and simultaneously achieving a good airway seal to prevent gas leakage. To further support the inflation and deflation of the airbag, a dedicated gas channel is pre-designed inside the wall of the first sleeve 10. This channel is rationally laid out and has an air inlet and an air outlet 12 located on the outer peripheral wall of the first sleeve 10. The air outlet 12 is directly connected to the internal cavity of the annular airbag 30, allowing the operator to flexibly control the inflation and deflation of the airbag by injecting or withdrawing gas from the air inlet into the channel. This greatly enhances the applicability, ease of operation, and medical safety of the entire component.

[0028] According to an embodiment of the present invention, the tracheal cannula assembly 100 allows for detachable connection of the first cannula 10 and the second cannula 20 through the snap-fit ​​of elastic buckles and slots. This allows the patient to remove the second cannula 20 separately for cleaning and replacement without removing the first cannula 10. Furthermore, an annular airbag 30 is fitted onto the first cannula 10. A gas channel is provided within the wall of the first cannula 10, with an inlet and an outlet 12 located on the outer peripheral wall of the first cannula 10. The outlet 12 communicates with the annular airbag 30. This allows air to be injected into the gas channel through the inlet, inflating the annular airbag 30 and preventing bleeding from the surgical area from flowing into the lungs, thus reducing safety risks.

[0029] In some embodiments, the inner wall of the first sleeve 10 is provided with a first internal thread 11, and the outer peripheral wall of the second sleeve 20 is provided with a first external thread 21. The first internal thread 11 and the first external thread 21 are threadedly engaged, such as... Figure 1 As shown, the annular airbag 30 is sleeved on the first sleeve 10. A gas channel is provided inside the wall of the first sleeve 10. The gas channel has an inlet and an outlet 12. The inlet and outlet 12 (as shown in the image) Figure 2 and Figure 3 The air outlets 12 shown are all located on the outer peripheral wall of the first sleeve 10, and the air outlets 12 are connected to the annular airbag 30.

[0030] It is understandable that, such as Figure 1 and Figure 4As shown, the tracheal cannula assembly 100 includes a first cannula 10 located on the inner side, a second cannula 20 fitted on its outer side, and an annular cuff 30 surrounding the outermost layer. Specifically, the first cannula 10 is precisely fitted onto the outside of the second cannula 20, and the two are securely and tightly fitted together through a high-precision threaded connection structure. Specifically, the inner wall of the first cannula 10 is precision-machined to form a first internal thread 11, while the outer peripheral wall of the second cannula 20 is correspondingly machined with a matching first external thread 21. When the two are screwed together, a stable connection is achieved, which not only ensures the integrity and strength of the overall assembly structure, but also significantly improves the reliability and durability in practical applications. In addition, the annular cuff 30 is fitted around the outer periphery of the first cannula 10. The main function of this cuff is to inflate it during actual clinical use, thereby effectively and reliably fixing the position of the cannula in the trachea, while simultaneously achieving a good airway seal to prevent gas leakage. To further support the inflation and deflation of the airbag, a dedicated gas channel is pre-designed inside the wall of the first sleeve 10. This channel is rationally laid out and has an air inlet and an air outlet 12 located on the outer peripheral wall of the first sleeve 10. The air outlet 12 is directly connected to the internal cavity of the annular airbag 30, allowing the operator to flexibly control the inflation and deflation of the airbag by injecting or withdrawing gas from the air inlet into the channel. This greatly enhances the applicability, ease of operation, and medical safety of the entire component.

[0031] When applied to patients, the first and second cannulas 10 can be separated by rotating the second cannulas 20, thereby enabling cleaning and reducing the difficulty of cleaning. At the same time, air can be injected into the gas channel through the air inlet to inflate the annular airbag 30, thereby preventing bleeding from the surgical area from flowing to the lungs and reducing safety risks.

[0032] In this way, by providing a first internal thread 11 on the inner wall of the first sleeve 10 and a first external thread 21 on the outer peripheral wall of the second sleeve 20, the first internal thread 11 and the first external thread 21 are threaded together, so that the first sleeve 10 and the second sleeve 20 can be detachably connected. This allows the patient to remove the second sleeve 20 separately for cleaning and replacement without removing the first sleeve 10. Secondly, the annular airbag 30 is fitted onto the first sleeve 10. A gas channel is provided inside the tube wall of the first sleeve 10. The gas channel has an inlet and an outlet 12, both of which are located on the outer peripheral wall of the first sleeve 10. The outlet 12 communicates with the annular airbag 30. In this way, air can be injected into the gas channel through the inlet to inflate the annular airbag 30, thereby preventing bleeding from the surgical area from flowing to the lungs and reducing safety risks.

[0033] In some specific implementation cases, the cannula assembly used for endotracheal intervention further integrates two functional components: a switching valve (not shown in the figure) and a pressure-indicating balloon 40. The switching valve is precisely positioned at the inlet connection point, and its main function is to control whether external gas can enter the internal structure of the assembly. At the same time, the valve is adjustable, allowing for fine-tuning of the gas inflow rate and flow rate according to the actual needs of clinical operation, thereby improving the overall controllability of the operation.

[0034] like Figure 1 and Figure 3 As shown, the pressure-indicating balloon 40 can be connected to the first cannula 10 via a trachea, or the pressure-indicating balloon 40 can be placed on the outer surface of the first cannula 10 and connected to the annular balloon 30 via a dedicated internal connecting pipe, so that the two maintain dynamic consistency in air pressure, thereby reflecting the real-time pressure changes inside the annular balloon 30 in an instant and intuitive manner. In addition, the pressure-indicating balloon 40 is also equipped with a high-sensitivity pressure detection device, which can continuously monitor the pressure inside the balloon and feed back the real-time data to the monitoring system or operating interface, greatly assisting medical staff in accurately grasping the inflation status and pressure level of the balloon, ultimately effectively ensuring the safety of clinical procedures and the effectiveness of intervention measures.

[0035] In some specific implementations, the design of the indicator balloon typically includes one or more selectively operable vent structures 41. These vent structures 41 have flexible opening and closing functions, and can be adjusted accordingly based on preset control logic or external commands when specific operating conditions or actual needs change. By precisely controlling the opening and closing state of the vents 41, the release rate and total amount of gas or liquid filled inside the balloon can be effectively adjusted, thereby achieving refined management of the pressure level or total volume state inside the balloon. This design not only improves the controllability and adaptability of the balloon during use, but also enhances the performance and ease of operation of the entire system in complex application scenarios.

[0036] In some embodiments, such as Figure 2 and Figure 3As shown, a groove 13 extending continuously in the circumferential direction is precisely provided on the wall of the first sleeve 10. This groove 13 is ingeniously designed and precisely structured, specifically for accommodating and bonding at least a portion of the strip-shaped airbag 30. The annular airbag 30 can be securely and firmly embedded inside the groove 13. The width of the groove 13 is precisely calculated to be slightly larger than the actual size of the annular airbag 30 along its axis, thus providing sufficient and reasonable operating space for the smooth installation of the airbag and the subsequent inflation process. In particular, the bottom wall of the groove 13 is further machined with a second external thread 131. At the same time, the inner surface of the annular airbag 30 is correspondingly provided with a second internal thread that perfectly matches it. With the precise engagement and fit between the internal and external threads, the connection between the airbag and the first sleeve 10 can be reliably achieved, ensuring accurate positioning of their relative positions.

[0037] In some embodiments, such as Figure 2 and Figure 3 As shown, a circular air outlet 12 specifically designed and machined for gas input is also provided on one side wall of the slot 13 structure. This air outlet 12 is connected to the air inlet via a gas channel integrated within the wall of the first sleeve 10. The air inlet can be connected to a high-pressure gas supply device installed outside the system via a high-pressure resistant, flexible connecting pipe. This design ensures that the gas medium can be efficiently and uniformly delivered to the internal cavity of the annular airbag 30, thereby ensuring that when the system detects a critical command or signal requiring inflation, the annular airbag 30 can quickly, stably, and reliably complete the inflation and deployment process, meeting its functional requirements.

[0038] In some embodiments, such as Figure 2 As shown, the second cannula 20 has a finely chamfered outer wall 22 on the side near the annular cuff 30, forming a gently sloping, smoothly transitioning bevel structure. This chamfered design significantly reduces the frictional and propulsion resistance of the cannula assembly when inserted into the human airway, making the entire insertion process smoother and less strenuous. It also effectively avoids accidental scratches or improper compression damage to the patient's tracheal mucosa and surrounding soft tissues, thereby greatly improving the overall safety of clinical procedures and the patient's comfort during treatment.

[0039] In some embodiments, such as Figure 1As shown, at the end of the first cannula 10 furthest from the annular airbag 30, a hinged cap 50 is also fitted, which can be flexibly opened and closed. The cap 50 is connected to the first cannula 10 or the adhesive tape 61 via a connecting rope 51, or reliably connected to the cannula body via a micro-hinge mechanism. A high-performance sealing strip is provided on the contact surface, allowing the user to easily open the cap 50 or tightly seal the port of the first cannula 10 according to actual needs. This innovative design greatly facilitates a series of maintenance operations such as daily cleaning, thorough disinfection, visual inspection, or replacement of internal components, which is highly beneficial for ensuring the hygiene and functional integrity of the device during long-term use.

[0040] In some embodiments, such as Figure 1 As shown, the tracheostomy cannula assembly 100 is further equipped with a specially designed and optimized fixation structure 60 to enhance its stability and safety during clinical use. This fixation structure 60 mainly consists of an adhesive tape 61 and two high-strength straps 62. The adhesive tape 61 is made of a flexible material and can be tightly fitted and fixed to the outer wall of the first cannula 10, adhering to the patient's skin tissue. The two straps 62 are symmetrically arranged on the left and right sides of the adhesive tape 61, and each end is equipped with a medical-grade self-adhesive strip. These straps can be flexibly adjusted according to the actual size of different patients' necks and are firmly fixed through mutual adhesion, effectively preventing displacement or accidental dislodgement of the entire cannula assembly during use, ensuring that the device remains stable throughout the entire treatment cycle.

[0041] In some embodiments, the main material selected for the first sleeve 10 and / or the second sleeve 20 is medical-grade polycarbonate (PC) or polypropylene (PP) that meets medical standards. Both of these high-performance polymer materials have excellent biocompatibility and will not cause rejection reactions in the human body or adverse irritation to surrounding tissues. At the same time, they also have good mechanical strength, excellent impact resistance and stable chemical corrosion resistance, and can fully withstand the harsh requirements of repeated sterilization operations, imaging examinations and long-term use required in medical environments.

[0042] In some embodiments, the annular airbag 30 is made of medical high-elasticity silicone material. The annular airbag 30 is fixed to the outer side of the front end of the first sleeve 10 (1.0cm-1.5cm away from the opening of the first sleeve 10), with a thickness of 0.3mm. After inflation, it can fit tightly against the inner wall of the trachea. After inflation, it can directly prevent bleeding from the surgical area from flowing to the lungs and isolate the blood above the annular airbag 30 for timely cleaning. In some embodiments, the second sleeve 20 is made of medical-grade polypropylene (without metal components), and the gap between it and the inner wall of the first sleeve 10 is ≤0.3mm to ensure smooth ventilation; the front end of the second sleeve 20 is rounded (3mm radius) to avoid damaging the tracheal mucosa.

[0043] In some embodiments, the tail of the second sleeve 20 is provided with a non-slip handle and a rotation locking structure. During daily cleaning, there is no need to pull out the sleeve body. The second sleeve 20 can be pulled out by simply rotating to unlock it. After cleaning the phlegm crust, it can be reinserted and locked. The operation time is ≤20 seconds.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A tracheal cannula assembly (100), characterized in that, include: First sleeve (10); The second sleeve (20) is fitted with the first sleeve (10). The inner wall of the first sleeve (10) is provided with a groove, and the outer peripheral wall of the second sleeve (20) is provided with an elastic buckle (23). The elastic buckle engages with the groove. An annular airbag (30) is sleeved on the first sleeve (10). A gas channel is provided inside the tube wall of the first sleeve (10). The gas channel has an air inlet and an air outlet (12). The air inlet and the air outlet (12) are both located on the outer peripheral wall of the first sleeve (10). The air outlet (12) communicates with the annular airbag (30).

2. The tracheal cannula assembly (100) according to claim 1, characterized in that, Also includes: A switching valve and a pressure indicating balloon (40) are provided. The switching valve is located at the air inlet, and the pressure indicating balloon (40) is located in the first sleeve (10) and communicates with the annular airbag (30). The pressure indicating balloon (40) is equipped with a pressure detection device.

3. The tracheal cannula assembly (100) according to claim 2, characterized in that, The indicator balloon is provided with a selectively openable vent (41).

4. The tracheal cannula assembly (100) according to claim 1, characterized in that, The first sleeve (10) is provided with a slot (13), and at least a portion of the annular airbag (30) is located in the slot (13).

5. The tracheal cannula assembly (100) according to claim 4, characterized in that, The width of the slot (13) is greater than the axial dimension of the annular airbag (30), and the bottom wall of the slot (13) is provided with a second external thread (131), and the annular airbag (30) is provided with a second internal thread. The second internal thread and the second external thread (131) are threaded together.

6. The tracheal cannula assembly (100) according to claim 5, characterized in that, The air outlet (12) is located on the side wall of the slot (13).

7. The tracheal cannula assembly (100) according to claim 1, characterized in that, The outer peripheral wall of the second sleeve (20) near the end of the annular airbag (30) is provided with a chamfer (22).

8. The tracheal cannula assembly (100) according to claim 1, characterized in that, The first sleeve (10) is provided with an openable flap (50) at the end away from the annular airbag (30), the flap (50) being used to open or close the port of the first sleeve (10).

9. The tracheal cannula assembly (100) according to claim 1, characterized in that, Also includes: The fixing structure (60) includes an adhesive tape (61) and two straps (62). The adhesive tape (61) is fixedly sleeved on the first sleeve (10). The two straps (62) are respectively disposed on opposite sides of the adhesive tape (61), and the free ends of the two straps (62) are suitable for bonding.

10. The tracheal cannula assembly (100) according to any one of claims 1-9, characterized in that, The first sleeve (10) and / or the second sleeve (20) are made of medical polycarbonate or medical polypropylene.

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