Plugging cap for metal gas pipe sleeve

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a plugging cap for a metal trachea sleeve, which is suitable for tube plugging tests and respiratory function evaluation before tube drawing of a tracheotomy patient. Aiming at the problems that an existing pipe plugging mode is poor in sealing, unreliable in fixation and prone to falling off, the plugging cap is provided with the annular sleeve and the plugging plug, the flexible boss is arranged on the inner wall of the annular sleeve, and inner and outer dual sealing is achieved; the outer wall of the annular sleeve can be additionally provided with anti-skid lines and a positioning groove matched with the locking pin, the sealing plug is additionally provided with a guiding frustum and a plurality of sealing protrusions, and the end plate and the sealing plug are provided with center holes capable of switching a full-blocking pipe and a half-blocking pipe. The tracheal tube connector is firm in installation, convenient to operate, excellent in sealing performance, adaptive to a conventional metal tracheal tube, capable of effectively avoiding air leakage and falling off and capable of meeting clinical standard use requirements.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a sealing cap for a metal tracheal cannula, which is mainly applicable to the tube occlusion test and respiratory function assessment before extubation of tracheostomy patients. Background Technology

[0002] Tracheostomy is a common procedure for the clinical resuscitation and treatment of critically ill patients with airway obstruction and respiratory failure, and metal tracheostomy tubes are routine instruments used in this treatment. Before the patient's condition improves and they meet the criteria for extubation, a tube occlusion test is required to assess their spontaneous breathing ability. Therefore, the safety, sealing, and fixation reliability of the occlusion cap directly affect the safety of clinical procedures.

[0003] Existing methods for plugging metal endotracheal tubes often involve wrapping with gauze, attaching with adhesive tape, or using simple plugs. A variety of plugging materials are used, such as heparin caps, disposable infusion set filter connectors, disposable syringe syringes, and disposable latex catheter valves. While these materials are readily available, they have the following drawbacks:

[0004] 1. Poor sealing performance, prone to air leakage, and unable to meet the requirements of the standard pipe plugging test;

[0005] 2. The fixation is unreliable and there is no dedicated locking structure. The occlusive cap is prone to falling off or shifting when the patient coughs or moves, posing a potential airway safety hazard.

[0006] To address the aforementioned shortcomings, existing technologies lack a dedicated sealing cap that offers reliable sealing, secure fixation, ease of operation, strong adaptability, high comfort, and good compatibility with conventional metal endotracheal tube structures. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention proposes a sealing cap for metal endotracheal cannulas, which achieves tight sealing, reliable fixation, comfortable wearing, and convenient operation, meeting the safety and usage requirements of clinical cannula occlusion tests.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A sealing cap for a metal endotracheal tube, the metal endotracheal tube including an inner tube and an outer tube, a locking cap being provided at the proximal end of the inner tube, and a wing plate and a locking pin being provided on the outer tube, the sealing cap comprising:

[0010] An annular sleeve, wherein an end plate is fixedly connected to the top end of the annular sleeve to form a closed end; and the bottom end of the annular sleeve is an open end.

[0011] A sealing plug is installed inside the annular sleeve, and the top of the sealing plug is fixedly connected to the bottom surface of the end plate. The sealing plug is adapted to the inner hole of the locking cap and forms a sealed plug-in fit.

[0012] At least one flexible boss is provided on the inner wall of the annular sleeve to form an interference fit or elastic engagement with the outer wall of the locking cap.

[0013] Furthermore, the flexible bosses are continuously arranged or spaced along the inner wall of the annular sleeve to form an annular sealing strip or a multi-point pressing structure.

[0014] Furthermore, a flexible buffer layer is provided on the bottom end face of the annular sleeve along the entire circumference.

[0015] Furthermore, the outer wall of the annular sleeve is provided with a positioning groove for use with the locking pin. The positioning groove includes a vertical groove and a horizontal groove communicating with the vertical groove. The vertical groove is opened from the bottom end of the annular sleeve and extends upward. The bottom of the horizontal groove includes an inclined section and a horizontal section connected to the inclined section. The inclined section is inclined downward toward the vertical groove. When the locking pin slides into the horizontal groove through the vertical groove, the locking pin cooperates with the inclined section and forms a downward squeezing force.

[0016] Furthermore, the horizontal section is also provided with a downwardly recessed groove, and the head of the locking pin engages in the groove.

[0017] Furthermore, the outer wall of the annular sleeve is provided with anti-slip texture.

[0018] Furthermore, the end plate and sealing plug have a central hole, and a plug is adapted to be inserted into the central hole. The plug is connected to the outer wall of the annular sleeve via a connecting band.

[0019] Furthermore, the bottom end of the sealing plug is provided with a guide cone, and the outer wall of the sealing plug is provided with at least two annular sealing protrusions spaced apart along the axial direction. The outer diameter of the annular sealing protrusions is larger than the inner diameter of the inner hole of the locking cap.

[0020] The above technical solution has the following advantages:

[0021] 1. The annular sleeve in this invention has high strength and is not easily deformed, making it easy for medical staff to hold, operate, and install precisely. The internal sealing plug can elastically adapt to the inner hole of the locking cap to achieve self-adaptive sealing and effectively prevent air leakage. The flexible protrusion on the inner wall of the sleeve can elastically engage with the fitting groove on the locking cap, relying on the elastic reset of the material to achieve reliable positioning, significantly improving the stability of the sealing cap during patient activity, coughing, etc., and preventing loosening, displacement, or detachment.

[0022] 2. The flexible sealing plug and the inner hole of the locking cap form an insertion seal, which, together with the annular sealing protrusion on the outer wall, achieves multiple seals; the flexible boss and the outer wall of the locking cap are pressed together to seal, ensuring the airtightness of the plug from both the inside and outside, with excellent sealing performance, meeting the requirements of the plugging test.

[0023] 3. The flexible boss and the locking cap engage elastically, and together with the positioning groove and the rotating locking structure of the locking pin, a downward pressing force is generated under the action of the inclined section, realizing bidirectional axial and circumferential limiting, further improving the fixing reliability of the sealing cap.

[0024] 4. The positioning groove on the outer wall of the annular sleeve cooperates with the locking pin of the metal air tube sleeve to achieve quick guidance, accurate positioning and tightening during the installation of the sealing cap. The downward pressing force is generated by the structural design of the inclined section, and the snap-fit ​​limit of the groove achieves anti-dislodgement and anti-rotation, making the installation of the sealing cap convenient and efficient. After installation, it is not easy to loosen or rotate circumferentially, and can always maintain a stable and reliable sealing state. Attached Figure Description

[0025] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0026] Figure 1 This is a schematic diagram of the assembled structure of a metal endoscopic tube in the prior art.

[0027] Figure 2 This is a schematic diagram of the separate structure of a metal endotracheal tube before assembly in the prior art.

[0028] Figure 3 This is a schematic diagram of the overall structure of the sealing cap after it is installed with the metal tracheal sleeve in the first example.

[0029] Figure 4 This is a partial cross-sectional view of the sealing cap and the metal endotracheal tube in the first example.

[0030] Figure 5 This is a cross-sectional view of the sealing cap in the second example.

[0031] Figure 6 This is a schematic diagram of the structure when the sealing cap is used in conjunction with the metal tracheal sleeve in the second example.

[0032] Figure 7 The third example is a three-dimensional structure of the sealing cap. Figure 1 .

[0033] Figure 8 yes Figure 7 Front view of the sealing cap.

[0034] Figure 9 The third example is a three-dimensional structure of the sealing cap. Figure 2 .

[0035] Figure 10 yes Figure 9 Enlarged view of the structure of region A in the middle.

[0036] Figure 11 This is a schematic diagram of the structure after the sealing cap and the metal tracheal sleeve are assembled in the third example.

[0037] Figure 12 This is a schematic diagram of the separate structure of the sealing cap and the metal tracheal sleeve in the third example.

[0038] Figure 13 yes Figure 11 Enlarged schematic diagram of the structure of region B in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Outer sleeve; 2. Wing plate; 3. Interface seat; 4. Locking pin; 5. Lacing hole; 6. Inner sleeve; 7. Locking cap; 71. Flange; 8. Sealing cap; 81. Annular sleeve; 811. Anti-slip texture; 812. Flexible boss; 813. Flexible buffer layer; 82. End plate; 83. Sealing plug; 831. Center hole; 832. Annular sealing protrusion; 833. Guide cone; 9. Positioning notch; 10. Fitting groove; 11. Positioning groove; 111. Vertical groove; 112. Horizontal groove; 1121. Oblique section; 1122. Horizontal section; 1123. Groove; 12. Hole plug; 13. Connecting strap. Detailed Implementation

[0041] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The embodiments of this utility model are presented by way of example in the accompanying drawings. The same or similar reference numerals in the drawings represent the same or similar elements throughout, or elements having the same or similar functions. The embodiments described in this specification are for illustrative purposes only and are intended to help understand this utility model; they do not constitute a limitation on the scope of protection of this utility model.

[0042] As shown in Figures 1 and 2, existing conventional metal endotracheal tubes mainly consist of an inner tube 6 and an outer tube 1 that are interlocked. A wing plate 2 is fixed to the proximal root of the outer tube 1, with ties 5 at both ends. An interface seat 3, communicating with the lumen of the outer tube 1, is located at the center of the wing plate 2. A locking cap 7, rotatable around its axis, is located at the proximal end of the inner tube 6. The outer wall of the locking cap 7 has an annular fitting groove 10. The inner tube 6 can be inserted into the lumen of the outer tube 1 via the interface seat 3, and the locking cap 7 can rotate axially. The upper end face of the interface seat 3 is pressed together; the side of the interface seat 3 on the wing plate 2 is fixed with an axially protruding locking pin 4, and the lower end of the locking cap 7 is provided with a radially extending flange 71. The flange 71 is provided with a positioning notch 9 that matches the locking pin 4. In use, the positioning notch 9 is first aligned with the locking pin 4 so that the inner sleeve 6 can be smoothly inserted into the outer sleeve 1. Then, by screwing the locking cap 7, the flange 71 and the head of the locking pin 4 are engaged, thereby restricting the inner sleeve 6 from axially dislodging from the outer sleeve 1.

[0043] like Figures 3 to 4 As shown, this embodiment proposes a sealing cap for a metal endotracheal tube, suitable for use in the plugging test of the aforementioned conventional metal endotracheal tube. The metal endotracheal tube includes an inner sleeve 6 and an outer sleeve 1. A locking cap 7 is provided near the proximal end of the inner sleeve 6, and a wing plate 2 and a locking pin 4 are provided on the outer sleeve 1. The sealing cap 8 adopts a rigid-flexible combined structural design, and is composed of an annular sleeve 81, an end plate 82, a sealing plug 83, and a flexible boss 812. The components work together to achieve reliable plugging and fixation of the metal endotracheal tube. The specific structural settings are as follows:

[0044] The occlusion cap 8 includes an annular sleeve 81, which can be made of medical-grade rigid polymer material or medical-grade metal material, possessing sufficient structural strength, not easily deformed, and easy for medical personnel to hold, operate, and install accurately. An end plate 82 is fixedly connected to the top of the annular sleeve 81, forming a closed end, while the bottom of the annular sleeve 81 is an open end, providing insertion space for the occlusion cap 8 and the locking cap 7 of the metal endotracheal cannula.

[0045] The sealing cap 8 also includes a sealing plug 83, which can be made of medical-grade silicone rubber and has a flexible elastic structure. It is set inside the annular sleeve 81, and the top of the sealing plug 83 is fixedly connected to the bottom surface of the end plate 82. The sealing plug 83 is adapted to the inner hole of the locking cap 7 and forms a sealed insertion fit. When the sealing cap 8 is installed, the sealing plug 83 can be elastically inserted into the inner hole of the locking cap 7. The elastic deformation of the flexible material is used to tightly fit the inner wall of the inner hole of the locking cap 7, forming a reliable sealed insertion fit. The first seal is achieved from the inside of the locking cap 7, effectively preventing gas leakage from the inner hole of the airway.

[0046] In this embodiment, at least one flexible boss 812 is provided on the inner wall of the annular sleeve 81. The flexible boss 812 can be made of the same medical-grade silicone rubber as the sealing plug 83. It protrudes from the inner wall of the annular sleeve 81 and is fixedly connected to the inner wall of the annular sleeve 81. The flexible boss 812 is mainly used to form an interference fit or elastic engagement with the outer wall of the locking cap 7.

[0047] Regarding the interference fit: In this invention, the inner diameter of the flexible boss 812 is designed to be slightly smaller than the outer diameter of the outer wall of the locking cap 7, forming the structural basis for the interference fit. During the process of the sealing cap 8 being inserted downwards into the outside of the locking cap 7, the outer wall of the locking cap 7 will exert a continuous squeezing force on the flexible boss 812, causing the flexible boss 812 to undergo adaptive elastic deformation. After deformation, the flexible boss 812, relying on its excellent elastic restoring characteristics, generates a continuous and uniform pressure, tightly pressing against the outer wall surface of the locking cap 7, forming a reliable interference fit between the two. This not only achieves the sealing between the inner wall of the annular sleeve 81 and the outer wall of the locking cap 7, but also provides a preliminary fixing effect for the sealing cap 8, preventing it from radially shifting.

[0048] Regarding the elastic engagement: The flexible boss 812 is designed to fit into the pre-set groove 10 on the outer wall of the locking cap 7. Its size and position match the groove 10. After the sealing cap 8 is inserted, the flexible boss 812 can fit precisely into the groove 10 on the outer wall of the locking cap 7, forming a stable elastic engagement and limiting structure. This structure can, on the one hand, provide a secondary seal between the outer wall of the locking cap 7 and the inner wall of the annular sleeve 81, building a second line of defense for sealing from the outside of the locking cap 7, further strengthening the overall airtightness of the sealing and preventing air leakage; on the other hand, it can effectively limit the axial displacement of the sealing cap 8 relative to the locking cap 7, resisting the axial forces generated by the patient's coughing, turning over, and limb movements, greatly improving the installation stability of the sealing cap 8 and eliminating the risk of loosening or slipping.

[0049] In summary, the flexible boss 812 has diverse matching capabilities. It can achieve interference fit or elastic engagement with different parts such as the smooth surface of the outer wall of the locking cap 7 and the fitting groove 10, depending on the structural characteristics of the metal air tube sleeve locking cap 7. It has strong adaptability and flexible use.

[0050] The flexible boss 812 can be designed to be continuously arranged or spaced along the inner wall of the annular sleeve 81 according to actual application requirements, forming an annular sealing strip or a multi-point pressing structure. Both arrangement forms can effectively cooperate with the locking cap 7.

[0051] When the flexible boss 812 is continuously arranged along the inner wall of the annular sleeve 81, a complete annular sealing band can be formed on the inner wall of the annular sleeve 81. This structure can achieve full circumferential fit with the outer wall of the locking cap 7, allowing the interference fit and elastic engagement surface to cover the entire circumference of the outer wall of the locking cap 7. This not only greatly improves the comprehensiveness and tightness of the seal, but also achieves uniform positioning through full circumferential elastic pressure, making the connection between the sealing cap 8 and the locking cap 7 more stable.

[0052] When the flexible protrusions 812 are distributed circumferentially along the inner wall of the annular sleeve 81, a multi-point pressing structure is formed. The flexible protrusions 812 under this structure can elastically press against the outer wall of the locking cap 7 from multiple circumferential points. Although it is a multi-point contact, the elastic restoring force of each protrusion can form a synergistic effect, which can also achieve a reliable interference fit with the outer wall of the locking cap 7, and can also accurately engage with the fitting groove 10 to form a stable elastic engagement, effectively achieving the requirements of sealing and limiting.

[0053] In some embodiments, the outer wall of the annular sleeve 81 may also be provided with anti-slip texture 811, which can effectively increase the friction coefficient of the outer wall of the annular sleeve 81. When medical staff hold and operate, even if they are wearing medical gloves, they can avoid slipping and greatly improve the grip stability when inserting, removing and rotating the sealing cap 8.

[0054] The installation procedure for the sealing cap 8 in this embodiment is as follows:

[0055] Medical staff hold the outer wall of the annular sleeve 81, with the open end of the sealing cap 8 facing downwards, aligning it with the locking cap 7 of the metal endotracheal tube, and apply downward force to make the sealing plug 83 elastically insert into the inner hole of the locking cap 7. At the same time, the annular sleeve 81 is fitted onto the outside of the locking cap 7. During this process, the flexible protrusion 812 on the inner wall of the annular sleeve 81 undergoes elastic deformation due to the pressure of the outer wall of the locking cap 7 until the flexible protrusion 812 is engaged in the fitting groove 10 of the locking cap 7. At this time, the sealing plug 83 and the inner hole of the locking cap 7 are tightly fitted to form an internal seal, and the flexible protrusion 812, the outer wall of the locking cap 7, and the fitting groove 10 are tightly fitted to form an external seal, achieving a double sealing effect of internal and external. Moreover, the elastic engagement of the flexible protrusion 812 can effectively prevent the sealing cap 8 from falling out upwards, completing the rapid installation of the sealing cap 8.

[0056] When it is necessary to remove the occlusion cap 8, medical staff only need to hold the ring sleeve 81 and apply upward force to overcome the elastic locking force between the flexible boss 812 and the locking cap 7, and the occlusion cap 8 can be pulled out from the locking cap 7. The operation is simple and quick, without the need for additional tools, and is suitable for the needs of rapid clinical operation.

[0057] The occlusion cap 8 in this embodiment has a reasonable structural design. The rigid annular sleeve 81 ensures structural strength and ease of operation. The flexible occlusion plug 83 and the flexible boss 812 achieve double sealing inside and outside. At the same time, the flexible boss 812 and the locking cap 7 achieve reliable limiting through elastic engagement. This effectively solves the problems of poor sealing effect and unreliable fixation in existing tube occlusion methods. When the patient coughs, turns over, or moves, the occlusion cap 8 is not easy to loosen, shift, or fall off, and there is no airway safety hazard. It can meet the standard usage requirements for tube occlusion test and respiratory function assessment before extubation of tracheostomy patients.

[0058] like Figures 5 to 6 As shown, the second embodiment of this utility model further optimizes the structure based on the first embodiment. The end plate 82 and the sealing plug 83 are provided with a central hole 831. The central hole 831 is adapted to be inserted with a plug 12 to achieve full closure. The plug 12 is connected to the outer wall of the annular sleeve 81 through a connecting strap 13. The central hole 831 allows for flexible switching between full and partial closure of the sealing cap 8. When it is necessary to perform a phased respiratory function assessment on the patient, the plug 12 can be removed to connect the airway to the outside through the central hole 831, completing the partial closure operation. After the patient adapts, the plug 12 can be inserted again to achieve full closure, which conforms to the gradual clinical diagnosis and treatment process. The integrated design of the connecting strap 13 can effectively prevent the plug 12 from falling off or being lost after removal, ensuring the integrity of the accessories and avoiding the impact of the missing plug 12 on the full closure effect of the sealing cap 8.

[0059] In some embodiments, the bottom end of the sealing plug 83 is provided with a guide cone 833, and the outer wall of the sealing plug 83 is provided with at least two annular sealing protrusions 832 spaced axially. The outer diameter of the annular sealing protrusions 832 is larger than the inner diameter of the inner hole of the locking cap 7. The guide cone 833 has a tapered structure, which can play a guiding role in the process of inserting the sealing plug 83 into the inner hole of the locking cap 7, reducing the difficulty of aligning the sealing plug 83 with the inner hole of the locking cap 7, and making the sealing plug 83 slide into the inner hole more smoothly, improving the convenience and efficiency of the installation operation. The annular sealing protrusions 832 with larger outer diameter will undergo elastic deformation under the pressure of the inner wall of the inner hole after the sealing plug 83 is inserted into the inner hole of the locking cap 7, and fit tightly with the inner wall of the inner hole. The multiple annular sealing protrusions 832 spaced apart form a multi-layer sealing structure, constructing multiple internal sealing defenses, greatly improving the tightness of the seal, and effectively preventing the occurrence of air leakage problems.

[0060] Technical effects:

[0061] The flexible sealing plug 83 forms an insertion seal with the inner hole of the locking cap 7, and works with the annular sealing protrusion 832 on the outer wall to achieve multiple seals and improve the tightness of the seal; the flexible boss 812 presses and seals with the outer wall of the locking cap 7, ensuring the airtightness of the seal from both inside and outside, with excellent sealing performance, meeting the requirements of the plugging test.

[0062] It should be noted that the sealing plug 83 and the flexible boss 812 can be made of any one of medical-grade silicone rubber, medical-grade polyurethane elastomer, or thermoplastic medical elastomer. All of the above-mentioned medical elastic materials possess good elasticity, sealing properties, and biocompatibility, making them suitable for use in medical settings. Medical personnel can choose the appropriate material based on actual usage needs and cost control.

[0063] like Figures 7 to 13 As shown, the third embodiment of this utility model has made further improvements based on the above embodiments. A flexible buffer layer 813 is provided on the bottom end face of the annular sleeve 81 along the entire circumference. The flexible buffer layer 813 is made of medical grade elastic material. After the sealing cap 8 is installed, the flexible buffer layer 813 can press against the upper end face of the wing plate 2 to avoid hard compression caused by direct contact between the hard bottom end of the annular sleeve 81 and the wing plate 2.

[0064] The outer wall of the annular sleeve 81 is provided with a positioning groove 11 for use with the locking pin 4. The positioning groove 11 includes a vertical groove 111 and a horizontal groove 112 communicating with the vertical groove 111. The vertical groove 111 is opened from the bottom end of the annular sleeve 81 and extends upward. The bottom of the horizontal groove 112 includes an inclined section 1121 and a horizontal section 1122 connected to the inclined section 1121. The inclined section 1121 is inclined downward toward the vertical groove 111. When the locking pin 4 slides into the horizontal groove 112 through the vertical groove 111, the locking pin 4 cooperates with the inclined section 1121 and forms a downward squeezing force.

[0065] In this embodiment, the installation and assembly process of the sealing cap 8 is as follows: When installing the sealing cap 8, first align the vertical groove 111 of the positioning groove 11 with the locking pin 4, push the sealing cap 8 downward so that the locking pin 4 slides upward along the vertical groove 111, and then rotate the annular sleeve 81 so that the locking pin 4 slides into the horizontal groove 112 through the vertical groove 111, and slides along the inclined section 1121 to the horizontal section 1122. During the process of the locking pin 4 engaging with the inclined section 1121, a downward squeezing force will be generated, which will press the sealing cap 8 downward as a whole, further improving the installation firmness of the sealing cap 8.

[0066] Furthermore, the horizontal section 1122 is also provided with a downwardly recessed groove 1123, and the head of the locking pin 4 can engage in the groove 1123. When the locking pin 4 slides along the inclined section 1121 to the horizontal section 1122, its head can be precisely engaged inside the groove 1123, forming a stable snap-fit ​​limiting structure. During the process of the sealing cap 8 being continuously pressed down by the downward extrusion force of the inclined section 1121, the flexible buffer layer 813 at the bottom of the annular sleeve 81 will fully contact the upper surface of the wing plate 2 and undergo flattening deformation under compression.

[0067] The engagement of the groove 1123 with the head of the locking pin 4 forms a circumferential limiting constraint on the locking pin 4, effectively preventing the occlusion cap 8 from rotating circumferentially relative to the metal tracheal tube, and avoiding the displacement of the engagement position between the positioning groove 11 and the locking pin 4 due to external forces such as the patient's cough or limb movement; at the same time, the elastic reaction force generated by the deformation of the flexible buffer layer 813 will also form a continuous upward pressing force on the occlusion cap 8, which works synergistically with the engagement limiting of the locking pin 4 to make the installation and fixation of the occlusion cap 8 more secure and stable.

[0068] The application effect of this embodiment is significant: the positioning groove 11 on the outer wall of the annular sleeve 81 cooperates with the locking pin 4 of the metal air tube sleeve to achieve rapid guidance, accurate positioning and tightening during the installation of the sealing cap 8. The downward pressing force is generated by the structural design of the inclined section 1121, and the snap-fit ​​limit of the groove 1123 achieves anti-dislodgement and anti-rotation, making the installation of the sealing cap 8 convenient and efficient. After installation, it is not easy to loosen or rotate circumferentially, and can always maintain a stable and reliable sealing state.

[0069] The specific embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but these are not intended to limit the scope of protection of this utility model. Based on the technical solutions disclosed in this utility model, all modifications, variations, or equivalent substitutions that can be made by those skilled in the art without creative effort fall within the scope of protection of this utility model.

Claims

1. A sealing cap for a metal tracheal cannula, the metal tracheal cannula comprising an inner sleeve (6) and an outer sleeve (1), wherein a locking cap (7) is provided at the proximal end of the inner sleeve (6), and a wing plate (2) and a locking pin (4) are provided on the outer sleeve (1), characterized in that, The sealing cap (8) includes: An annular sleeve (81) has an end plate (82) fixedly connected to its top end to form a closed end; the bottom end of the annular sleeve (81) is an open end. A sealing plug (83) is set inside the annular sleeve (81), and the top of the sealing plug (83) is fixedly connected to the bottom surface of the end plate (82). The sealing plug (83) is adapted to the inner hole of the locking cap (7) and forms a sealed plug-in fit. At least one flexible boss (812) is protruding from the inner wall of the annular sleeve (81) to form an interference fit or elastic engagement with the outer wall of the locking cap (7).

2. The sealing cap for a metal gas tube sleeve according to claim 1, characterized in that, The flexible bosses (812) are continuously arranged or spaced along the inner wall of the annular sleeve (81) to form an annular sealing strip or a multi-point pressing structure.

3. The sealing cap for a metal endotracheal tube according to claim 1, characterized in that, The bottom end face of the annular sleeve (81) is provided with a flexible buffer layer (813) along the entire circumference.

4. A sealing cap for a metal endoscopic tube according to claim 3, characterized in that, The outer wall of the annular sleeve (81) is provided with a positioning groove (11) that cooperates with the locking pin (4). The positioning groove (11) includes a vertical groove (111) and a horizontal groove (112) that communicates with the vertical groove (111). The vertical groove (111) is opened from the bottom end of the annular sleeve (81) and extends upward. The bottom of the horizontal groove (112) includes an inclined section (1121) and a horizontal section (1122) that is connected to the inclined section (1121). The inclined section (1121) is inclined downward toward the vertical groove (111). When the locking pin (4) slides into the horizontal groove (112) through the vertical groove (111), the locking pin (4) cooperates with the inclined section (1121) and forms a downward squeezing force.

5. A sealing cap for a metal endoscopic tube according to claim 4, characterized in that, The horizontal section (1122) is also provided with a downward recessed groove (1123), and the head of the locking pin (4) engages in the groove (1123).

6. A sealing cap for a metal endoscopic tube according to claim 1, characterized in that, The outer wall of the annular sleeve (81) is provided with anti-slip texture (811).

7. A sealing cap for a metal endotracheal tube according to claim 1, characterized in that, The end plate (82) and the sealing plug (83) are provided with a central hole (831), and a hole plug (12) is adapted to be inserted into the central hole (831). The hole plug (12) is connected to the outer wall of the annular sleeve (81) through a connecting band (13).

8. A sealing cap for a metal endoscopic tube according to claim 1, characterized in that, The bottom end of the sealing plug (83) is provided with a guide cone (833), and the outer wall of the sealing plug (83) is provided with at least two annular sealing protrusions (832) spaced apart along the axial direction. The outer diameter of the annular sealing protrusions (832) is larger than the inner diameter of the inner hole of the locking cap (7).

Images