Airway stent for airway stenosis treatment

Abstract

The invention relates to the technical field of medical instruments, in particular to an airway stent for airway stenosis treatment, which comprises an end stent, the end stent is composed of an outer tube body, a conical body and an inner tube body which are coaxially distributed, the outer side ring surface of the outer tube body is fixedly connected with the inner wall of a narrowed port of the conical body, and the inner tube body is arranged on the inner side ring surface of the outer tube body. By means of the optimized design of the connecting mechanism, the end support and the valve support are effectively connected, self-adaptive contraction of the valve support can be achieved, the valve support can be matched with the inner membrane mechanism, the dynamic change of an air channel is coped, the self shape and the supporting force are effectively adjusted, the valve support is tightly attached to the wall of the air channel all the time, stable supporting is provided, and the service life of the valve support is prolonged. Support displacement or insufficient support caused by diameter change of the airway is prevented; and through mutual combination of the limiting assembly and the rotary flow distribution assembly, the limiting function during dynamic adjustment is achieved, a flushing agent can be conveniently injected into the support, and granulation is prevented from growing through meshes of the support.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an airway stent for the treatment of airway stenosis. Background Technology

[0002] Airway stents are key medical devices used to treat central airway stenosis or fistulas. Their core function is to restore airway patency through physical support and improve the patient's ventilation. Common stents are made using injection molding or braiding processes. Their main purpose is to stabilize and support the narrowed airway, maintain a fixed position for a long time to keep the airway open, and improve the therapeutic effect and safety of airway stents.

[0003] In the prior art, such as the removable airway stent disclosed in CN113616375B, a support net is included, within which a support frame is installed. The support frame includes multiple coaxially vertically arranged telescopic support parts, which are fixedly connected by multiple connecting rods. The multiple telescopic support parts are used to support the support net at different positions. Each telescopic support part includes a retainer, and a turbine is rotatably connected to the bottom of the retainer. Multiple worm gears are engaged on the turbine, which drive multiple intersecting arc-shaped frames to move, thereby enabling the support net to contract or expand inward, providing support for the airway and facilitating rapid contraction and removal.

[0004] However, in actual use, factors such as airway secretions, airflow from coughing, and changes in body position during patient treatment can cause stent displacement. If secretions are not treated in time, they can cause restenosis of the patient's airway. Tumors or granulation tissue can grow through the stent mesh, causing restenosis in the lumen and thus affecting the treatment effect.

[0005] Therefore, this invention proposes an airway stent for the treatment of airway stenosis, which solves the problem that existing stents may shift or fall off due to factors such as secretions in the airway, airflow generated by coughing, and changes in body position, leading to airway restenosis, affecting treatment effectiveness, and even requiring reoperation. The self-contracting stent can be better fixed in the airway, reducing the risk of displacement and dislodgement caused by external factors, and improving the safety and stability of treatment. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an airway stent for the treatment of airway stenosis, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an airway stent for treating airway stenosis, comprising: The end support is composed of an outer tube, a conical body, and an inner tube, which are coaxially distributed. The outer circumferential surface of the outer tube is fixedly connected to the inner wall of the narrowed port of the conical body, and the inner tube is disposed on the inner circumferential surface of the outer tube. A connecting mechanism includes a support ring frame and a circular ring plate fixedly connected to its inner side. Limiting groove 1 and limiting groove 2 are evenly opened on the inner wall of the circular ring plate. A limiting component is provided on the side of the circular ring plate near the end support. A rotating flow distribution component is movably installed on the inner ring surface of the circular ring plate. The rotating flow distribution component includes a rotating cover. The outer ring surface of the rotating cover is rotatably connected to the inner ring surface of the circular ring plate. An adaptive contraction mechanism, comprising a valve support, an inner connecting node, an outer connecting node, and a contraction frame, wherein the inner and outer connecting nodes are staggered on the connecting nodes of the valve support. The inner membrane mechanism and the elastic support mechanism are provided, wherein the inner membrane mechanism is disposed between the outer side of the elastic support mechanism and the inner side of the valve support.

[0008] Preferably, the limiting component includes a support block, which is fixedly installed on the outer surface of the circular ring plate near the end bracket by bolts, and multiple sets of the support blocks are mounted on the outer side of the limiting groove two. An annular limiting track is fixedly connected to the inner side of the multiple sets of support blocks, and a limiting track groove is formed on the inner annular surface of the annular limiting track.

[0009] Preferably, the rotating cover is integrally formed from a U-shaped cover and a conical cover. A fixing protrusion is fixedly connected to the outer side of the U-shaped cover. The outer surface of the fixing protrusion is rotatably connected to the inner wall of the limiting groove. The outer surface of the U-shaped cover away from the conical cover is rotatably connected to the inner side of the outer tube and the outer surface of the rotating cover. The outer surface of the conical cover is uniformly provided with flow equalization grooves.

[0010] Preferably, an annular groove is provided on the inner side of the U-shaped cover, and an auxiliary rinsing component is provided on the inner side of the annular groove. The auxiliary rinsing component includes a flow support rib, the two ends of which pass through the inner sides of the U-shaped cover and the conical cover, respectively. An inlet is provided at the end of the flow support rib away from the conical cover, the other end of the flow support rib is closed, and an outlet is provided on the outer ring side of the flow support rib.

[0011] Preferably, the rotating distribution assembly further includes a driving component and a linkage component. The driving component includes a connecting plate fixedly installed on the outer ring side of the outer tube. A control motor is fixedly installed on one side of the connecting plate. A gear is fixedly connected to the output shaft of the control motor. A connecting gear ring meshes with the outer surface of the gear and rotates. The inner ring surface of the connecting gear ring is fixedly connected to the outer ring surface of the rotating cover.

[0012] Preferably, the linkage includes a swing rod, one end of which is fixedly connected to a hinge block one, which is movably hinged to the outer ring surface of the rotating cover, and the other end of which is fixedly connected to a hinge block two.

[0013] Preferably, the length of the inner connecting node is greater than the length of the outer connecting node, and an inner connecting rod is slidably connected to the inner side of the inner connecting node. One end of the outer surface of the inner connecting rod is movably connected to the outer surface of the hinge block two, and the inner connecting rod is slidably installed inside the limiting groove two.

[0014] Preferably, an outer connecting rod is slidably connected to the inner side of the outer connecting node. The outer connecting rod is slidably installed inside the limiting groove one, and a sliding bolt is slidably connected to the inner surface of the limiting groove one. The outer surface of the sliding bolt is movably connected to one end of the shrink frame, and both the inner connecting rod and the outer connecting rod are movably connected to the node of the shrink frame.

[0015] Preferably, the inner membrane mechanism consists of an inner valve and an inner concave membrane. The inner valve and the inner concave membrane are integrally formed to form a petal-shaped structure, and the outer curved surface of the inner concave membrane is in movable contact with the inner side of the inner connecting rod.

[0016] Preferably, the elastic support mechanism includes a support ring and a curved elastic rod. The curved elastic rod is fixedly installed on both sides of the support ring in a divergent claw shape. A protruding liner is fixedly connected to the outer ring surface of the support ring. The outer surfaces of the curved elastic rod and the protruding liner respectively move in contact with the inner side of the inner valve and the inner concave membrane.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention proposes an airway stent for treating airway stenosis. Through an optimized design of the connecting mechanism, it effectively connects the end stent and the valve stent, while also enabling the valve stent to self-adaptively contract. Working in conjunction with the endothelial mechanism, it responds to dynamic changes in the airway, effectively adjusting its shape and support strength. This ensures the valve stent remains tightly fitted to the airway wall, providing stable support and preventing stent displacement or insufficient support due to changes in airway diameter. The combination of the limiting component and the rotating flow distribution component not only satisfies the limiting function during dynamic adjustments but also facilitates the injection of flushing agent into the stent. This prevents granulation tissue from growing through the stent mesh, thus avoiding intraluminal restenosis, while also clearing secretions between the meshes. This avoids the blindness of traditional suctioning, reduces airway damage, and further improves treatment efficacy. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 For the present invention Figure 2 A schematic diagram showing the disassembled structure of the mid-end head bracket and support ring frame; Figure 4 For the present invention Figure 2 A magnified structural diagram at point A; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A1; Figure 6 For the present invention Figure 4 Enlarged structural diagram at point A2; Figure 7 For the present invention Figure 1 A schematic diagram of the cross-sectional structure of the left section at BB; Figure 8 For the present invention Figure 7 A magnified structural diagram at point B; Figure 9 This is a schematic diagram of the extended state structure of the valve stent of the present invention; Figure 10 This is a schematic diagram of the valve stent in its contracted state according to the present invention; Figure 11 This is a partial structural diagram of the circular ring plate of the present invention from a bottom view; Figure 12 For the present invention Figure 1 Schematic diagram of the cross-sectional structure of the right section at BB; Figure 13 For the present invention Figure 12 A schematic diagram of the structure after the internal valve has been removed; Figure 14 This is a three-dimensional structural diagram of the auxiliary flushing component of the present invention; Figure 15 This is a three-dimensional structural diagram of the elastic internal support mechanism of the present invention.

[0019] In the diagram: 1. End bracket; 11. Outer tube; 111. Connecting plate; 112. Control motor; 113. Gear; 114. Connecting gear ring; 12. Conical body; 13. Inner tube; 2. Support ring frame; 21. Circular ring plate; 210. Limiting groove one; 2100. Limiting groove two; 22. Support block; 221. Annular limiting track; 2210. Limiting track groove; 23. Rotating cover; 230. Annular groove ; 231, Flow support rib; 2310, Inlet; 23101, Outlet; 2301, Flow equalization channel; 24, Swinging tie rod; 3, Valve support; 31, Inner connection node; 311, Inner connecting rod; 32, Outer connection node; 321, Outer connecting rod; 322, Sliding bolt; 33, Contraction frame; 4, Inner valve; 41, Concave membrane; 5, Support ring; 51, Curved elastic rod; 52, Protruding liner. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1, please refer to Figure 1-15 This invention provides a technical solution: an airway stent for treating airway stenosis, comprising: an end-cap stent 1, consisting of an outer tube 11, a cone 12, and an inner tube 13, all three being coaxially distributed; the outer circumferential surface of the outer tube 11 is fixedly connected to the inner wall of the narrowing port of the cone 12; the inner tube 13 is disposed on the inner circumferential surface of the outer tube 11; and a connecting mechanism, comprising a support ring frame 2 and a circular ring plate 21 fixedly connected to its inner side; the inner wall of the circular ring plate 21 is uniformly provided with a first limiting groove 210 and a second limiting groove 2100; a limiting component is provided on the side of the circular ring plate 21 near the end-cap stent 1; the flared end of the cone 12 is fixedly connected to the outer surface of the support ring frame 2. The outer tube 11 serves as the rigid support frame of the stent. Its outer annular surface is fixedly connected to the inner wall of the narrowed port of the cone 12 via laser welding, ensuring an axial tensile strength ≥50N. The flared section of the cone 12 is designed with a gradually curved surface (radius of curvature 8-12mm), and is connected to the inner wall of the support ring 2 via M4 bolts, forming a stress-dispersing structure to reduce pressure on the airway mucosa (≤15kPa). The inner tube 13 is installed inside the outer tube 11, forming an annular flushing chamber (1.5mm wide) between them. The surface of the chamber is electrochemically polished, with a friction coefficient ≤0.1, ensuring that the flow resistance of the flushing fluid (physiological saline or drug solution) is less than 0.5N·s / m. 2 ; Please refer to Figures 2 to 6 The limiting component includes a support block 22, which is bolted to the outer surface of the circular ring plate 21 near the end bracket 1. Multiple sets of support blocks 22 are mounted on the outer side of the limiting groove 2100. An annular limiting track 221 is fixedly connected to the inner side of the multiple sets of support blocks 22. A limiting groove 2210 is formed on the inner annular surface of the annular limiting track 221. The circular ring plate 21 is clamped and mounted on the inner annular side of the support ring frame 2, such as... Figure 6As shown, the flared section of the cone-shaped body 12 is connected to the inner wall of the support ring frame 2 by bolts, thereby connecting the end support 1 to the support ring frame 2 as a whole. Through the optimized design of the overall structure of the end support 1, it is easy to penetrate to the distal end of the patient's airway stenosis without affecting the normal breathing of the airway, and it can also meet the limiting effect of each component. An annular flushing chamber is formed between the inner side of the outer tube body 11 and the outer side of the inner tube body 13. This annular flushing chamber is used for the flow of flushing fluid. When it is necessary to flush the secretions generated in the patient's airway, the annular flushing chamber of the flushing fluid mechanism flows.

[0022] Example 2, see attached document Figure 1-15 Based on Embodiment 1, in order to achieve adaptive dynamic adjustment of the valve support 3 and rotational auxiliary flow distribution of the rotating cover 23: A rotating flow distribution assembly is movably mounted on the inner annular surface of the circular ring plate 21. The rotating flow distribution assembly includes a rotating cover 23, the outer annular surface of which is rotatably connected to the inner annular surface of the circular ring plate 21. The rotating cover 23 is integrally formed from a U-shaped cover and a conical cover. A fixing protrusion is fixedly connected to the outer side of the U-shaped cover, and the outer surface of the fixing protrusion is rotatably connected to the inner wall of the limiting rail groove 2210. The rotating flow distribution assembly also includes a driving component and a linkage component. The driving component includes a connecting plate fixedly installed on the outer annular side of the outer tube 11. 111. A control motor 112 is fixedly installed on one side of the connecting plate 111. A gear 113 is fixedly connected to the output shaft of the control motor 112. A connecting gear ring 114 meshes and rotates on the outer surface of the gear 113. The inner ring surface of the connecting gear ring 114 is fixedly connected to the outer ring surface of the rotating cover 23. The linkage includes a swing rod 24. One end of the swing rod 24 is fixedly connected to a hinge block 1. The hinge block 1 is movably hinged to the outer ring surface of the rotating cover 23. The other end of the swing rod 24 is fixedly connected to a hinge block 2. The adaptive contraction mechanism is used to adapt to the dynamic adjustment of the stent in the patient's airway, satisfying adaptive support and contraction. The adaptive contraction mechanism includes a valve stent 3, an inner connecting node 31, an outer connecting node 32, and a contraction frame 33. The inner connecting node 31 and the outer connecting node 32 are staggered on the connecting nodes of the valve stent 3. The length of the inner connecting node 31 is greater than the length of the outer connecting node 32. An inner connecting rod 311 is slidably connected to the inner side of the inner connecting node 31. The outer surface of one end of the inner connecting rod 311 is movably connected to the outer surface of the hinge block 2, and the inner connecting rod 311 is slidably installed on the inner side of the limiting groove 2100. An outer connecting rod 321 is slidably connected to the inner side of the outer connecting node 32. The outer connecting rod 321 is slidably installed on the inner side of the limiting groove 1 210, and a sliding bolt 322 is slidably connected to the inner surface of the limiting groove 1 210. The outer surface of the sliding bolt 322 is movably connected to one end of the contraction frame 33, and both the inner connecting rod 311 and the outer connecting rod 321 are movably connected to the nodes of the contraction frame 33. Please refer to Figure 4 and Figure 5 As shown, when the airway stent is inserted into the narrowed part of the patient's airway, the valve stent 3 is dynamically adjusted according to the patient's airway needs. Specifically, when the valve stent 3 is expanded, the control motor 112 is turned on, and its output shaft drives the gear 113 to rotate, which in turn drives the connecting gear ring 114 to rotate. The inner ring surface of the connecting gear ring 114 is fixedly connected to the outer ring surface of the rotating cover 23. Therefore, under the limiting action of the annular limiting track 221 and the fixed convex ring, the rotating cover 23 rotates as a whole. According to the patient's airway expansion needs, the forward and reverse rotation state of the control motor 112 and the rotation amplitude of the rotating cover 23 are adjusted. At this time, under the connecting action of the swing lever 24, please refer to... Figure 9 and Figure 10 As shown, here Figure 9 This diagram illustrates the extended state of the valve support 3. At this point, one end of the swing rod 24 is connected to the outer ring surface of the rotating cover 23 via hinge block one, and the other end is connected to the inner connecting rod 311 via hinge block two. When hinge block two moves away from the center point of the rotating cover 23, the extension range of the valve support 3 is greater. Figure 10 As shown, at this time, the hinge block 2 is close to the center point of the rotating cover 23, and the valve support 3 is in an inward retracted state, thus realizing the convenient retraction of the valve support 3. It is worth noting that, reference Figure 11 As shown, the hinge block 2 is connected to one end of the inner connecting rod 311. When the position of the hinge block 2 changes, under the connection of the retractable frame 33, multiple sets of corresponding outer connecting rods 321 follow the inner connecting rod 311 to perform coaxial diameter change. Through the combination of the inner connecting rod 311 and the outer connecting rod 321, the inner side of the valve stent 3 is stretched and contracted, and the outer side is pushed and contracted simultaneously, avoiding the situation of the retractable machine expanding and scattering. It can adapt to the patient's airway more conveniently and quickly, and further improve the treatment effect of airway stenosis.

[0023] Example 3, refer to Appendix Figure 1-15 Based on Example 2, in order to achieve uniformity and effectiveness of the cleaning machine's distribution: The outer surface of the U-shaped cover away from the conical cover is rotatably connected to the inner side of the outer tube 11 and the outer surface of the rotating cover 23. The outer surface of the conical cover is uniformly provided with flow equalization grooves 2301. The inner side of the U-shaped cover is provided with an annular groove 230. An auxiliary flushing component is provided on the inner side of the annular groove 230. The auxiliary flushing component includes a flow support rib 231. The two ends of the flow support rib 231 pass through the inner sides of the U-shaped cover and the conical cover, respectively. The end of the flow support rib 231 away from the conical cover is provided with an inlet 2310. The other end of the flow support rib 231 is closed. The outer ring side of the flow support rib 231 is provided with an outlet 23101. refer to Figure 5 and Figure 14As shown, when auxiliary flushing of secretions in a narrowed airway is required, an external flushing structure is connected to the proximal end of the end bracket 1, away from the valve bracket 3. This flushing structure can be an indwelling tubing (not shown). When the flushing fluid reaches one end of the U-shaped cover of the rotating cover 23 through the annular flushing chamber, the flushing fluid enters the interior of the rotating cover 23 through the inlet 2310 and exits through the outlet 23101. During the forward and reverse rotation of the rotating cover 23, the valve bracket 3 repeatedly contracts and expands. At this time, the support ring 2 can serve as a temporary support structure, and the rotating cover 23 rotates... When the mask 23 is rotating, the flushing agent is centrifugally flushed against the inner wall of the airway, and finally, the secretions are naturally discharged into the mouth or expelled through coughing by gravity. It should be noted that when the valve stent 3 is in the expansion support stage, the rotating mask 23 does not rotate, and the flushing agent can also be introduced into the airway through the indwelling tubing to gently flush the airway. It is worth noting that the flow support rib 231 here not only serves as a flow channel for the flushing agent, but also provides structural support for the flow support rib 231, ensuring the overall structural strength of the flow support rib 231.

[0024] Example 4, see attached document Figure 1-15 Based on Example 3, to prevent intraluminal restenosis caused by the growth of tumors or granulation tissue in the patient's airway through the stent mesh: The inner membrane mechanism is used to cover the inner side of the valve stent 3 to prevent granulation tissue from growing inward in the airway. The elastic support mechanism is used for elastic support of the inner membrane mechanism and the valve stent 3 during dynamic deformation. The inner membrane mechanism is located between the outer side of the elastic support mechanism and the inner side of the valve stent 3. The elastic support mechanism includes a support ring 5 and a curved spring rod 51. The curved spring rod 51 is fixedly installed on both sides of the support ring 5 in a divergent claw shape. A protruding liner 52 is fixedly connected to the outer ring surface of the support ring 5. The outer surfaces of the curved spring rod 51 and the protruding liner 52 respectively move and abut against the inner side of the inner valve 4 and the concave membrane 41. The curved spring rod 51 is made of nickel-titanium alloy wire (0.3 mm in diameter) and formed into a memory spring structure through a heat setting process. The surface of the protruding liner 52 is covered with silicone (coating thickness 0.1 mm), which reduces the coefficient of friction to 0.05 and provides antibacterial properties. refer to Figure 7 , Figure 12 and Figure 15 As shown, the inner membrane mechanism consists of an inner valve 4 and an inner concave membrane 41. The inner valve 4 and the inner concave membrane 41 are integrally formed to form a valve-like structure, and the outer curved surface of the inner concave membrane 41 is in contact with the inner side of the inner connecting rod 311. When the valve support 3 as a whole dynamically contracts and expands, the curved elastic rods 51 at both ends of the supporting ring 5 can evenly apply force to both ends of the inner valve 4, while also preventing airflow obstruction in the airway.

[0025] The working principle and usage process of this invention are as follows: First, during the implantation stage, the airway stent is inserted deep into the narrowed area of ​​the patient's airway. The optimized design of the end stent 1 facilitates its access to the distal end of the narrowed area without affecting normal breathing. Second, during the adaptive adjustment stage, according to the patient's airway needs, the control motor 112 is activated. Its output shaft drives the gear 113 to rotate, which in turn drives the connecting gear ring 114 and the rotating cover 23 to rotate. Under the connection of the swing lever 24, the inner connecting rod 311 and the outer connecting rod 321 move synchronously through the change in the position of the hinge block 2, enabling the valve stent 3 to conveniently contract and expand to adapt to the patient's airway. In addition, during the flushing stage, it is necessary to... When flushing secretions from the airway, a flushing structure (such as an indwelling tubing) is connected to the proximal end of the end-stent 1. The flushing agent enters the rotating hood 23 through the annular flushing chamber and flows out through the inlet 2310 and outlet 23101. When the rotating hood 23 rotates, it assists in flushing the inner wall of the airway under the action of centrifugal force. Finally, during the valve stent expansion and support stage, the rotating hood does not rotate, and the airway can still be flushed gently through the indwelling tubing. During long-term use, the endometrial mechanism and the elastic support mechanism work together, and the curved elastic rod 51 applies force evenly to the inner valve 4 to prevent tumors or granulation tissue in the airway from growing through the stent mesh and avoid restenosis in the lumen.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. An airway stent for treating airway stenosis, characterized by, Include: The end support (1) is composed of an outer tube body (11), a conical body (12) and an inner tube body (13) coaxially distributed, the outer side ring surface of the outer tube body (11) is fixedly connected with the inner wall of the narrow port of the conical body (12), and the inner tube body (13) is arranged on the inner side ring surface of the outer tube body (11); The connecting mechanism includes a support ring frame (2) and a circular ring plate (21) fixedly connected inside the support ring frame (2), limit grooves one (210) and limit grooves two (2100) are uniformly arranged on the inner wall of the circular ring plate (21), a limiting assembly is arranged on the side of the circular ring plate (21) close to the end support (1), a rotating flow distribution assembly is movably mounted on the inner side ring surface of the circular ring plate (21), and the rotating flow distribution assembly includes a rotating cover body (23). The self-adapting contraction mechanism includes a valve support (3), an inner connecting node (31), an outer connecting node (32) and a contraction frame (33), the inner connecting node (31) and the outer connecting node (32) are staggered on the connecting node of the valve support (3); The inner membrane mechanism and the elastic support mechanism are arranged between the outer side of the elastic support mechanism and the inner side of the valve support (3).

2. The airway stent for treating airway stenosis according to claim 1, wherein: The limiting assembly includes a support block (22), the support block (22) is fixedly installed on the outer surface of the side of the circular ring plate (21) close to the end support (1) through bolts, a plurality of support blocks (22) are arranged on the outer side of the limit groove two (2100), a plurality of support blocks (22) are fixedly connected with the inner side of the annular limiting track (221), and the inner side ring surface of the annular limiting track (221) is provided with a limiting track groove (2210).

3. The airway stent for treating airway stenosis according to claim 2, characterized in that: The rotating cover body (23) is integrally formed by a U-shaped cover body and a conical cover body, the outer side of the U-shaped cover body is fixedly connected with a fixed convex ring, the outer surface of the fixed convex ring is rotatably connected with the inner wall of the limiting track groove (2210), the outer surface of the side of the U-shaped cover body away from the conical cover body is rotatably connected with the inner side of the outer tube body (11) and the outer side of the rotating cover body (23), and the outer side surface of the conical cover body is uniformly provided with a uniform flow groove (2301).

4. The airway stent for treating airway stenosis according to claim 3, characterized in that: The inner side of the U-shaped cover body is provided with an annular groove (230), the inner side of the annular groove (230) is provided with an auxiliary flushing piece, the auxiliary flushing piece includes a flow supporting rib pipe (231), the two ends of the flow supporting rib pipe (231) respectively penetrate the inner sides of the U-shaped cover body and the conical cover body, one end of the flow supporting rib pipe (231) away from the conical cover body is provided with an inlet (2310), the other end of the flow supporting rib pipe (231) is in a closed state, and the outer ring side surface of the flow supporting rib pipe (231) is provided with an outlet (23101).

5. The airway stent for treating airway stenosis according to claim 1, wherein: The rotating flow distribution assembly further comprises a driving member and a linkage member, the driving member comprises a connecting plate (111) fixedly installed on the outer ring side of the outer pipe body (11), one side of the connecting plate (111) is fixedly installed with a control motor (112), the output shaft of the control motor (112) is fixedly connected with a gear (113), the outer surface of the gear (113) is engaged with a connecting gear ring (114) rotating, and the inner ring surface of the connecting gear ring (114) is fixedly connected with the outer side ring surface of the rotating cover body (23).

6. The airway stent for treating airway stenosis according to claim 5, wherein: The linkage member comprises a swing pull rod (24), one end of the swing pull rod (24) is fixedly connected with a hinged block one, the hinged block one is movably hinged with the outer ring surface of the rotating cover body (23), and the other end of the swing pull rod (24) is fixedly connected with a hinged block two.

7. The airway stent for treating airway stenosis according to claim 6, characterized in that: The length of the inner connecting node (31) is greater than that of the outer connecting node (32), the inner side of the inner connecting node (31) is slidably connected with an inner connecting rod (311), one end of the outer surface of the inner connecting rod (311) is movably connected with the outer surface of the hinged block two, and the inner connecting rod (311) is slidably installed on the inner side of the limiting groove two (2100).

8. The airway stent of claim 1, wherein: The inner side of the outer connecting node (32) is slidably connected with an outer connecting rod (321), the outer connecting rod (321) is slidably installed on the inner side of the limiting groove one (210), the inner surface of the limiting groove one (210) is slidably connected with a sliding bolt (322), the outer surface of the sliding bolt (322) is movably connected with one end of the contraction frame (33), and the inner connecting rod (311) and the outer connecting rod (321) are movably connected with the node of the contraction frame (33).

9. The airway stent for treating airway stenosis according to claim 8, wherein: The inner membrane mechanism comprises an inner attached valve (4) and an inner concave membrane (41), the inner attached valve (4) and the inner concave membrane (41) are integrally formed and form a valve structure, and the outer side curved surface of the inner concave membrane (41) is movably abutted with the inner side of the inner connecting rod (311).

10. The airway stent for treating airway stenosis according to claim 9, wherein: The elastic support mechanism comprises a support ring (5) and a curved elastic rod (51), the curved elastic rod (51) is fixedly installed on both sides of the support ring (5) in a divergent claw shape, the outer ring surface of the support ring (5) is fixedly connected with a protruding lining rod (52), and the outer surfaces of the curved elastic rod (51) and the protruding lining rod (52) are movably abutted with the inner sides of the inner attached valve (4) and the inner concave membrane (41) respectively.

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