An airway stent

Abstract

The application belongs to the technical field of medical devices, and is a kind of airway stent, comprising a stent body and a covering film arranged on the stent body, characterized in that the stent body comprises a fixed stent section and a movable stent section arranged at the end of the fixed stent section, and the covering film is arranged on the fixed stent section; at least one movable part in the form of an opening is arranged on the movable stent section, and the radial dimension of the movable stent section is greater than that of the fixed stent section. According to the airway stent in the application, the movable stent section with a radial dimension greater than that of the fixed stent section is arranged to increase the anchoring force of the airway stent, so that the airway stent is not prone to displacement, and the movable part in the form of an opening is arranged to increase the deformation space of the movable stent section, reduce the stimulation of the airway stent to the inner wall of the airway, and prevent the growth of granulation tissue.

Description

Technical Field

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

[0002] With increasing environmental pollution, various benign airway lesions, such as traumatic scar stenosis, tracheomalacia, or malignant tissue lesions and airway stenosis caused by compression, seriously threaten human health, significantly restrict patients' respiratory function, and even endanger their lives. Once airway stenosis occurs, the first step is to ensure the patient's breathing is unobstructed through interventional medical devices, followed by surgery or other treatments tailored to the patient's condition.

[0003] Airway stents are an important treatment for tracheal and bronchial stenosis, enabling rapid airway reconstruction and alleviating symptoms such as difficulty breathing. Based on material, airway stents can be divided into metallic stents and non-metallic stents. Based on whether they are covered, metallic stents are further divided into covered metallic stents and bare metallic stents.

[0004] Among them, covered metal stents add a covering layer to the bare stent, which prevents tumors or granulation tissue from growing into the stent. Because the covering causes less irritation to the airway wall, it can effectively reduce granulation tissue proliferation and is therefore widely used.

[0005] However, due to insufficient anchoring force between the covering and the airway wall, airway stent displacement is prone to occur during long-term implantation. Therefore, new technologies are needed to address the issue of displacement of covered airway stents. Summary of the Invention

[0006] The purpose of this invention is to at least solve the problem that existing metal-coated stents easily irritate the airway wall, thereby increasing granulation tissue proliferation.

[0007] The present invention proposes an airway stent, comprising a stent body and a covering film disposed on the stent body, wherein the stent body comprises a plurality of fixed stent segments and at least one movable stent segment, both ends of the movable stent segment are provided with the fixed stent segments, and the covering film is disposed on the fixed stent segments; the movable stent segment is provided with at least one open movable portion.

[0008] According to the airway stent of the present invention, a membrane is provided on the fixed stent segment to prevent tumors on the inner wall of the airway from growing into the inner airway stent. Furthermore, a movable stent segment is provided at the end of the fixed stent segment, and the radial dimension of the movable stent segment is set to be larger than that of the fixed stent segment, thereby increasing the radial support force of the movable stent segment on the inner wall of the airway and preventing airway stent displacement. Moreover, an open-shaped movable portion is provided on the movable stent segment to provide greater space during deformation, reducing the stimulation of the movable stent segment on the inner wall of the airway and preventing granulation tissue growth.

[0009] In addition, the airway stent according to the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the movable support segment includes at least one movable wavering, and the movable part is disposed on the movable wavering; the fixed support segment includes a plurality of fixed waverings connected in sequence.

[0011] In some embodiments of the present invention, the movable support segment includes two adjacent movable wave coils, and the movable portions of the adjacent movable wave coils are arranged opposite to each other.

[0012] In some embodiments of the present invention, a plurality of movable portions are provided on the movable wave ring, and the plurality of movable portions are circumferentially spaced on the movable wave ring.

[0013] In some embodiments of the present invention, the movable waveform loop includes a plurality of movable waveform segments connected in sequence, and the plurality of movable waveform segments are connected end to end to form a loop-shaped movable waveform loop; the fixed waveform loop includes a plurality of fixed waveform segments connected in sequence, and the plurality of fixed waveform segments are connected end to end to form a loop-shaped fixed waveform loop.

[0014] In some embodiments of the present invention, the active waveform segment includes an active high-wave segment and an active low-wave segment, adjacent active waveform loops are connected by hooking the active high-wave segment, the axial height of the active high-wave segment is greater than the axial height of the active low-wave segment, and the active part includes the active low-wave segment.

[0015] In some embodiments of the present invention, the active high-wave segment includes an active high-wave peak, an active high-wave trough, and a high-wave connecting rod connecting the active high-wave peak and the active high-wave trough; adjacent active wave loops are connected by hooks between adjacent active high-wave peaks and active high-wave troughs; the active low-wave segment includes an active low-wave peak, an active low-wave trough, and a low-wave connecting rod connecting the active low-wave peak and the active low-wave trough; the axial height between the active low-wave peak and the active low-wave trough is less than the axial height between the active high-wave peak and the active high-wave trough.

[0016] In some embodiments of the present invention, the fixed waveform segmentation includes fixed peaks, fixed troughs, and a fixed connecting rod connecting the fixed peaks and the fixed troughs, wherein adjacent fixed waveform loops are hooked together by adjacent fixed peaks and fixed troughs.

[0017] In some embodiments of the present invention, the coating includes an outer film disposed on the outer surface of the fixed support section and an inner film disposed on the inner surface of the fixed support section, wherein the inner film and the outer film are bonded and fixed through the mesh of the fixed support section.

[0018] In some embodiments of the present invention, an extension membrane covering the inner surface of the movable support segment is further provided within the support body. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the airway support after it is installed on the inner wall of the airway in Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the support body in Embodiment 1 of the present invention;

[0021] Figure 3 In Embodiment 1 of the present invention Figure 2 A magnified view of point A;

[0022] Figure 4 This is a schematic diagram of the planar structure of the support body in Embodiment 1 of the present invention;

[0023] Figure 5 In Embodiment 1 of the present invention Figure 4 A magnified view of point B;

[0024] Figure 6 This is a schematic diagram of the structure of the active waveguide in Embodiment 1 of the present invention;

[0025] Figure 7 This is a schematic diagram of the fixed wave coil structure in Embodiment 1 of the present invention;

[0026] Figure 8 This is a schematic diagram of the coating structure in Embodiment 1 of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of multiple movable support segments in Embodiment 1 of the present invention;

[0028] Figure 10 This is a schematic diagram of the coating structure in Embodiment 2 of the present invention;

[0029] Figure 11 This is a schematic diagram of the airway stent in Embodiment 4 of the present invention;

[0030] Figure 12 This is a schematic diagram of the extended membrane structure in Embodiment 4 of the present invention;

[0031] Figure 13 This is a schematic diagram of the airway stent in Embodiment 5 of the present invention;

[0032] Figure 14 This is a schematic diagram of the overall structure of the airway support after it is installed on the inner wall of the airway in Embodiment 5 of the present invention.

[0033] The labels in the attached diagram are as follows:

[0034] 100. Airway support; 10. Support body; 11. Mesh; 20. Cover; 21. Inner membrane; 22. Outer membrane; 23. Extension membrane; 30. Fixed support section; 31. Fixed wave coil; 32. Fixed waveform segment; 321. Fixed wave crest; 322. Fixed wave trough; 323. Fixed connecting rod; 40. Movable support section; 41. Movable part; 42. Movable wave coil; 421. First movable wave coil; 422. Second movable wave coil 423. Third active wave circle; 43. Active waveform segment; 44. Active high wave segment; 441. Active high wave peak; 442. Active high wave trough; 443. High wave connecting rod; 45. Active low wave segment; 451. Active low wave peak; 452. Active low wave trough; 453. Low wave connecting rod; 454. Opening; 50. First active stent segment; 60. Second active stent segment; 70. Inner wall of the airway; 80. Tumor. Detailed Implementation

[0035] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also refer to the plural forms.

[0037] Although the terms first, second, third, etc., may be used in the text to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "upper," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure.

[0039] For ease of description, the following description uses the terms "proximal" and "distal," where "proximal" refers to the end closer to the operator and "distal" refers to the end farther from the operator. The phrase "axial direction" should be understood in this patent as indicating the direction in which the interventional device is advanced and de-escalated, and the direction perpendicular to the "axial direction" is defined as the "radial direction."

[0040] Example 1

[0041] An airway stent, such as Figure 1 and Figure 2 As shown, the device includes a support body 10 and a covering film 20 disposed on the support body 10. Two ports are provided at the two ends of the support body 10 along the axial direction of the support body 10. In the integral structure formed by the two ports and the support body 10, an airflow channel is formed in the inner cavity of the support body 10.

[0042] The support body 10 includes multiple fixed support sections 30 and at least one movable support section 40. Fixed support sections 30 are provided at both ends of the movable support section 40, and at least one open movable part 41 is provided on the movable support section 40.

[0043] In this embodiment, fixed support sections 30 are provided at both ends of the movable support section 40, that is, the movable support section 40 is located in the middle of the support body 10. When the airway stent 100 is implanted, the open-shaped movable portion 41 on the movable support section 40 can be placed at the location of the tumor 80 on the inner wall of the airway 70. In this way, the open portion of the movable portion 41 conforms to the tumor 80, so that the stent better covers the tumor 80, and the airway stent 100 has better compliance. On the other hand, when the airway stent 100 is implanted, the open-shaped movable portion 41 on the movable support section 40 can also be placed at the location of the tumor 80 that is not on the inner wall of the airway 70. In this way, when the airway stent 100 is deformed by radial force, the open-shaped movable portion 41 will be deformed by pressure and tilted towards the inner wall of the airway 70, thereby increasing the friction between the stent and the inner wall of the airway 70 and reducing the stent displacement rate.

[0044] Furthermore, the stent body 10 includes a covered portion and an uncovered portion. A covering membrane 20 is disposed on the stent body 10 to form the covered portion, and the stent body 10 without a covering membrane 20 forms the uncovered portion. In this embodiment, the covering membrane 20 is disposed on the fixed stent segment 30. By disposing of the covering membrane 20 on the fixed stent segment 30, the covering membrane 20 prevents the growth of the airway tumor 80 or granulation tissue into the stent body 10. The covering membrane 20 disposed on the fixed stent segment 30 is a polymer medical covering membrane, such as a TPU membrane, a polytetrafluoroethylene membrane, or a silicone rubber membrane.

[0045] Although airway stents are currently effective and safe for treating malignant airway stenosis, there are still some adverse complications caused by problems such as the structure of the stent itself, with stent displacement being one of the main issues.

[0046] Combination Figures 1 to 3 As shown, to address the issue of easy displacement of the airway stent 100, this embodiment employs a movable portion 41 on the movable stent section 40 of the airway stent 100. When the tumor 80 on the inner wall 70 of the airway compresses the airway body, the compressed airway stent 100 will tilt towards the inner wall 70 of the airway through the open movable portion 41. Therefore, the movable portion 41 not only covers the tumor 80, giving the airway stent 100 better adherence to the airway, but also accelerates the endothelialization of the airway stent 100 with the inner wall 70 of the airway, preventing stent displacement.

[0047] Combination Figures 4 to 7 As shown, the fixed support section 30 includes a plurality of fixed corrugated coils 31 connected in sequence. The movable support section 40 includes at least one movable corrugated coil 42, and the movable part 41 is disposed on the movable corrugated coil 42. Both the fixed corrugated coil 31 and the movable corrugated coil 42 are closed annular metal corrugated coils, wherein the closed annular metal corrugated coils are wave-shaped. Specifically, the support body 10 is formed by weaving nickel-titanium metal wire or other shape memory metal wire. The support body 10 can be formed by weaving a single nickel-titanium wire or by weaving multiple nickel-titanium wires together.

[0048] Furthermore, based on the different conditions of the patients, combined with Figure 9 As shown, one or more movable parts 41 can be selected to be provided on the movable wave coil 42. When multiple movable parts 41 are provided on the movable wave coil 42, such as three or four movable parts 41, the multiple movable parts 41 are circumferentially spaced on the movable wave coil 42, specifically, the multiple movable parts 41 are evenly distributed circumferentially on the movable wave coil 42. Since the location of airway tumors 80 is uncertain, by providing multiple movable parts 41, it is possible to better adapt to different conditions and prevent the growth of more tumors 80.

[0049] Specifically, the movable waveform loop 42 includes several sequentially connected movable waveform segments 43, which are connected end-to-end to form a loop 42. The fixed waveform loop 31 includes several sequentially connected fixed waveform segments 32, which are connected end-to-end to form a loop 31. The movable waveform segments 43 and the fixed waveform segments 32 are arranged in an S-shape or a Z-shape.

[0050] The active waveform segment 43 includes an active high-wave segment 44 and an active low-wave segment 45. Adjacent active waveforms 42 are connected by hooks through the active high-wave segment 44. The axial height of the active high-wave segment 44 is greater than the axial height of the active low-wave segment 45. The active part 41 includes the active low-wave segment 45.

[0051] In this embodiment, adjacent movable waveform segments 43 are hooked together by movable high-wave segments 44, while the axial height of movable low-wave segments 45 is less than that of movable high-wave segments 44. Therefore, movable low-wave segments 45 are not hooked together with other waveform segments, and the movable low-wave segments 45 and the support body 10 are in a state where one end is connected and the other end is movable. Since the axial height of movable low-wave segments 45 is less than that of movable high-wave segments 44, there is an opening 434 between movable low-wave segments 45 and other waveform segments, i.e., a predetermined gap exists.

[0052] Specifically, the sum of the width of the opening 434 and the width of the active low-wave segment 45 is equal to the width of the active high-wave segment 44, and the width of the opening 434 is less than the width of the active low-wave segment 45. In this embodiment, the ratio of the width of the opening 434 to the width of the active low-wave segment is 1:3.

[0053] The active high-wave segment 44 includes an active high-wave peak 441, an active high-wave trough 442, and a high-wave connecting rod 443 connecting the active high-wave peak 441 and the active high-wave trough 442. Adjacent active wave loops 42 are connected by hooks between adjacent active high-wave peaks 441 and active high-wave troughs 442. The active low-wave segment 45 includes an active low-wave peak 451, an active low-wave trough 452, and a low-wave connecting rod 453 connecting the active low-wave peak 451 and the active low-wave trough 452. The axial height between the active low-wave peak 451 and the active low-wave trough 452 is less than the axial height between the active high-wave peak 441 and the active high-wave trough 442.

[0054] In this embodiment, the movable part 41 is a movable low-wave segment 45, that is, the movable part 41 includes a movable low-wave peak 451, a movable low-wave trough 452, and a low-wave connecting rod 453. The low-wave connecting rod 453 is used to connect the movable low-wave peak 451 and the movable low-wave trough 452. The movable part 41 is connected to the movable wave coil 42 through the movable low-wave peak 451 or the movable low-wave trough 452. When the movable part 41 is connected to the movable wave coil 42 through the movable low-wave peak 451, the movable low-wave trough 452 is movable, and there is a predetermined gap between the movable low-wave trough 452 and the peak of the adjacent wave coil. The predetermined gap forms an opening 434. When the movable part 41 is connected to the movable wave coil 42 through the movable low-wave trough 452, the movable low-wave peak 451 is movable, and there is a predetermined gap between the movable low-wave peak 451 and the trough of the adjacent wave coil. The predetermined gap forms an opening 434.

[0055] When the movable part 41 is positioned at the tumor 80 on the inner wall 70 of the airway, the tumor 80 protrudes outward from the inner wall 70 of the airway, thus squeezing the movable low-wave segment 45. Since the movable low-wave segment 45 is not hooked or connected to other adjacent waveform segments, the movable waveform segment 43 can rotate relative to the movable wave coil 42 and adhere to the tumor 80, thus better covering the tumor 80.

[0056] When the movable part 41 is not positioned at the tumor 80 on the inner wall 70 of the airway, the tumor 80 protrudes outward, thus compressing other parts of the airway body. These other parts of the airway body deform under radial force. When this deformation is transmitted to the movable low-wave segment 45, since the movable low-wave segment 45 is not hooked to adjacent waveform segments, it tilts towards the inner wall 70 of the airway, increasing the friction between the airway stent 100 and the inner wall 70, thereby reducing the likelihood of stent displacement.

[0057] The fixed waveform segment 32 includes a fixed peak 321, a fixed trough 322, and a fixed connecting rod 323 connecting the fixed peak 321 and the fixed trough 322. Adjacent fixed waveform loops 31 are connected by hooks between adjacent fixed peaks 321 and fixed troughs 322.

[0058] In addition, adjacent fixed waveform segments 32 and active waveform segments 43 are connected by hooks. Specifically, fixed peaks 321 are hooked to adjacent active high troughs 442, and active troughs are hooked to adjacent active high peaks 441.

[0059] In this embodiment, each fixed waveform segment 32 and the movable waveform segment 43 are connected by hooks. Therefore, during and after implantation, the overall axial length of the airway stent 100 will not increase under the influence of radial force. This reduces the contact area between the airway stent 100 and the inner wall 70 of the airway, reduces the stimulation caused by the airway stent 100 to the inner wall 70 of the airway, and thus reduces the probability and growth rate of granulation tissue hyperplasia in the airway.

[0060] Furthermore, the airway support 100 has an unhooked movable part 41, which is open in shape. Compared with conventional supports without movable part 41, the radial force is smaller, thereby reducing the pressure of the airway support 100 as a whole on the inner wall 70 of the airway, and further reducing the probability and growth rate of granulation tissue in the airway.

[0061] Furthermore, such as Figure 8 As shown, the membrane 20 includes an outer membrane 22 disposed on the outer surface of the fixed support section 30 and an inner membrane 21 disposed on the inner surface of the fixed support section 30. The inner membrane 21 and the outer membrane 22 are joined and fixed through the mesh 11 of the fixed support section 30.

[0062] An outer membrane 22 is provided on the outer surface of the fixed stent segment 30 to prevent granulation tissue or tumor 80 from growing into the airway stent 100 from the inner wall 70. An inner membrane 21 is provided on the inner surface of the fixed stent segment 30, and the inner membrane 21 and the outer membrane 22 are bonded and fixed through the mesh 11 of the fixed stent segment 30. This enhances the bonding strength between the outer membrane 22, the inner membrane 21 and the fixed stent segment 30, and prevents the covering membrane 20 from detaching from the stent body 10 due to continued growth of the tumor 80 after long-term implantation of the airway stent 100.

[0063] In this embodiment, a membrane 20 is provided on both the inner and outer sides of the stent body 10. The membrane 20 is disposed on the fixed stent segment 30, allowing tissue to grow along the structure of the stent body 10 and into the lumen through the gaps. The movable stent segment 40 of the stent body 10 does not have a membrane 20, allowing the unmembrane-covered movable stent segment 40 to quickly become endothelialized, preventing stent displacement. The movable portion 41 on the movable stent segment 40 can conform to the shape of the tumor 80, better covering the tumor 80 and providing better adhesion; or the movable portion 41 can tilt towards the airway inner wall 70 when other parts of the stent body 10 are deformed by pressure, thereby increasing the friction between the airway stent 100 and the airway inner wall 70 and preventing airway stent 100 displacement.

[0064] Example 2

[0065] Embodiment 2 of this application provides an airway stent, such as Figure 10As shown, the similarities between Embodiment 2 and Embodiment 1 will not be repeated. The difference between Embodiment 2 and Embodiment 1 is that an extension membrane 23 covering the inner surface of the movable support section 40 is also provided inside the support body 10. That is, in this embodiment, the inner surface of the movable support section 40 is provided with the extension membrane 23, while the outer surface of the movable support section 40 does not have a membrane structure. The extension membrane 23 can be integrally connected with the inner membrane 21 provided inside the fixed support section 30, or it can be provided separately.

[0066] With the above-described configuration in this embodiment, the outer surface of the movable stent segment 40 can directly contact the airway inner wall 70, allowing the outer surface of the movable stent segment 40 to quickly endothelialize with the airway inner wall 70, thereby preventing airway displacement. Furthermore, by providing an extension membrane 23 on the inner surface of the movable stent segment 40, excessive growth of the tumor 80 or granulation tissue into the airway stent 100 can be prevented.

[0067] That is, the airway stent 100 in this embodiment can not only prevent the airway stent 100 from shifting, but also prevent the tumor 80 or granulation tissue from growing excessively into the airway stent 100.

[0068] In this embodiment, a movable support section 40 is provided on the fixed support section 30, and the movable support section 40 is located in the middle of the fixed support section 30. In other embodiments, multiple movable support sections 40 may be provided on the fixed support section 30, and the multiple movable support sections 40 are arranged at intervals.

[0069] Example 3

[0070] Embodiment 3 of this application provides an airway stent, such as Figure 4 and Figure 5 As shown, the similarities between Embodiment 3 and Embodiment 1 will not be repeated. The difference between Embodiment 3 and Embodiment 1 is that the movable support section 40 includes two adjacent movable wave coils 42, and the movable parts 41 of the adjacent movable wave coils 42 are arranged opposite to each other.

[0071] Specifically, in combination Figure 1 As shown, the two adjacent active low-wave segments 45 of the active wave coil 42 are arranged opposite each other, and the two oppositely arranged active low-wave segments 45 are not hooked together. When the active part 41 is placed at the position of the tumor 80 on the inner wall 70 of the airway, the two active low-wave segments 45 adhere to the tumor 80 from two sides of the tumor 80 respectively, thereby improving the wall adhesion of the stent body 10.

[0072] The outer side of the active waveform segment 43 does not have a membrane structure, allowing it to directly contact the inner wall 70 of the airway, enabling the active waveform segment 43 to rapidly endothelialize and preventing stent displacement. The inner side of the active waveform segment 43 is provided with an extension membrane 23 to prevent the tumor 80 or granulation tissue from excessively growing into the airway stent 100.

[0073] In other embodiments, the extension membrane 23 may not be provided on the inner side of the active waveform segment 43, so that the active part 41 can better conform to the shape of the tumor 80 to cover the tumor 80 and improve the adhesion of the airway stent 100.

[0074] Example 4

[0075] Embodiment 4 of this application provides an airway stent, such as Figure 11 and Figure 12 As shown, the similarities between Embodiment 4 and Embodiment 1 will not be repeated. The difference between Embodiment 4 and Embodiment 1 is that the movable support segment 40 is disposed at the end of the fixed support segment 30, and the radial dimension of the movable support segment 40 is greater than the radial dimension of the fixed support segment 30.

[0076] The movable support section 40 includes at least one movable wave coil 42, and a movable part 41 is disposed on the movable wave coil 42. The fixed support section 30 includes a plurality of fixed wave coils 31 connected in sequence. The movable wave coil 42 and the fixed wave coils 31 are connected by hooks.

[0077] In this embodiment, the radial dimension of the movable support section 40 is larger than that of the fixed support section 30, meaning the movable support section 40 is flared. With this design, the movable support section 40 provides greater radial support to the airway inner wall 70 compared to the fixed support section 30, resulting in greater friction between the movable support section 40 and the airway inner wall 70, effectively reducing the probability of displacement of the airway support 100.

[0078] Meanwhile, the movable support section 40 is provided with an open movable part 41. When the movable support section 40 is against the inner wall 70 of the airway, the movable part 41 has a larger displacement space. Therefore, when the movable support section 40 is deformed by pressure, the movable support section 40 has a larger deformation space. Through the above arrangement, the stimulation of the movable support section 40 on the inner wall 70 of the airway can be reduced, and granulation tissue growth can be prevented.

[0079] On the other hand, a covering 20 is provided on the fixed stent segment 30 to prevent the tumor 80 or granulation tissue from growing into the airway stent 100. The covering 20 includes an outer membrane 22 disposed on the outer surface of the fixed stent segment 30 and an inner membrane 21 disposed on the inner surface of the fixed stent segment 30. The inner membrane 21 and the outer membrane 22 are connected and fixed through the mesh 11 of the fixed stent segment 30.

[0080] An outer membrane 22 is provided on the outer surface of the fixed stent segment 30 to prevent the tumor 80 on the inner wall 70 of the airway from growing into the airway stent 100. An inner membrane 21 is provided on the inner surface of the fixed stent segment 30, and the inner membrane 21 and the outer membrane 22 are bonded and fixed through the mesh 11 of the fixed stent segment 30. This enhances the bonding strength between the outer membrane 22, the inner membrane 21 and the fixed stent segment 30, and prevents the covering membrane 20 from detaching from the stent body 10 due to the continued growth of the tumor 80 after long-term implantation of the airway stent 100.

[0081] In this embodiment, no membrane structure is provided on the outer side of the active waveform segment 43, meaning that the active waveform segment 43 can directly contact the inner wall 70 of the airway, allowing the active waveform segment 43 to rapidly endothelialize and prevent stent displacement. An extension membrane 23 is provided on the inner side of the active waveform segment 43 to prevent the tumor 80 or granulation tissue from excessively growing into the airway stent 100.

[0082] The extended membrane 23 disposed on the movable waveform segment 43 can be integrally connected with the inner membrane 21 disposed on the fixed support segment 30, or it can be disposed separately. The extended membrane 23 disposed on the inner side of the movable waveform segment 43 can effectively prevent granulation tissue from growing into the airway support 100.

[0083] Furthermore, the movable support section 40 includes a plurality of movable wave coils 42 connected in sequence, and the radial dimension of the movable wave coil 42 near the end of the support body 10 is greater than the radial dimension of the movable wave coil 42 away from the end of the support body 10.

[0084] In this embodiment, the movable support section 40 includes at least two movable wave rings 42, and the radial dimension of the movable wave rings 42 closer to the end of the support body 10 is larger, so that the movable support section 40 is arranged in an outwardly expanding conical shape.

[0085] Specifically, the movable waveform loop 42 includes several sequentially connected movable waveform segments 43, which are connected end-to-end to form a ring-shaped movable waveform loop 42; the fixed waveform loop 31 includes several sequentially connected fixed waveform segments 32, which are connected end-to-end to form a ring-shaped fixed waveform loop 31. The circumferential dimension of the movable waveform segments 43 of the movable waveform loop 42 is greater than the circumferential dimension of the fixed waveform segments 32 of the fixed waveform loop 31, and the number of movable waveform segments 43 in the movable waveform loop 42 is equal to the number of fixed waveform segments 32 in the fixed waveform loop 31.

[0086] In this embodiment, the movable support segment 40 includes three sequentially connected first movable wave coils 421, second movable wave coils 422 and third movable wave coils 423, which are arranged sequentially from the section away from the support body 10 to the end of the support body 10.

[0087] The circumferential dimension of the movable waveform segment 43 of the third movable wave coil 423 is larger than that of the movable waveform segment 43 of the second movable wave coil 422, and the circumferential dimension of the movable waveform segment 43 of the second movable wave coil is larger than that of the movable waveform segment 43 of the first movable wave coil 421. The number of movable waveform segments 43 of the first movable wave coil 421, the second movable wave coil 422, and the third movable wave coil 423 are all equal, and they are connected by hooks.

[0088] It should be noted that the three movable wave coils 42 in the movable support section 40 are merely an example of this embodiment. In other embodiments, there may be two or four, that is, the number of movable wave coils 42 can be selected according to actual needs.

[0089] Furthermore, both ends of the fixed support section 30 are provided with movable waveform segments 43, that is, the movable waveform segments 43 are fixed from both sides of the airway support 100 to make the airway support 100 more secure and further prevent the airway support 100 from shifting.

[0090] In summary, this embodiment prevents tumors 80 on the airway inner wall 70 from growing into the airway stent 100 by providing a membrane 20 on the fixed stent section 30. Furthermore, a movable stent section 40 is provided at the end of the fixed stent section 30, with its radial dimension being larger than that of the fixed stent section 30. This increases the radial support force of the movable stent section 40 on the airway inner wall 70, preventing displacement of the airway stent 100. Additionally, an open movable portion 41 is provided on the movable stent section 40 to provide more space during deformation, reducing irritation to the airway inner wall 70 and preventing granulation tissue growth. Simultaneously, an extension membrane 23 is provided on the inner side of the movable stent section 40 to prevent granulation tissue on the airway inner wall 70 from growing into the airway stent 100.

[0091] Example 5

[0092] Embodiment 5 of this application provides an airway stent, such as Figure 13 and Figure 14 As shown, the similarities between Embodiment 5 and Embodiment 4 will not be repeated. The difference between Embodiment 5 and Embodiment 4 is that at least one end and the middle of the fixed support segment 30 are provided with a movable support segment 40. The movable support segment 40 includes a first movable support segment 50 and a second movable support segment 60.

[0093] The first movable support segment 50 is located at the end of the fixed support segment 30, and the radial dimension of the first movable support segment 50 is greater than that of the fixed support segment 30. The second movable support segment 60 is located in the middle of the fixed support segment 30, and the radial dimension of the second movable support segment 60 is the same as that of the fixed support segment 30.

[0094] A covering membrane 20 is provided on the fixed stent segment 30. An inner membrane 21 is provided on the inner side of the fixed stent segment 30, and an outer membrane 22 is provided on the outer side of the fixed stent segment 30. The inner membrane 21 and the outer membrane 22 are fixed together by the mesh 11 of the fixed stent segment 30. The covering membrane 20 is used to prevent the tumor 80 or granulation tissue from growing into the airway stent 100.

[0095] In this embodiment, the first movable support section 50, located at the end of the fixed support section 30, is used to strengthen the anchoring force between the airway stent 100 and the inner wall 70 of the airway, preventing stent displacement. The second movable support section 60, located in the middle of the fixed support section 30, is used to conform to and cover the tumor 80, so that the airway stent 100 has better wall adhesion.

[0096] On the other hand, both the first movable stent segment 50 and the second movable stent segment 60 have an extension membrane 23 on their inner sides. The extension membrane 23 is used for the growth of tumor 80 or granulation tissue toward the airway stent 100. However, no membrane structure is provided on the outer sides of the first movable stent segment 50 and the second movable stent segment 60, meaning that the movable stent segment 40 is in direct contact with the inner wall 70 of the airway. This allows the movable stent segment 40 to quickly achieve endothelialization and prevents displacement of the airway stent 100.

[0097] In summary, according to the airway stent 100 of the present invention, by providing a membrane 20 on the fixed stent section 30, tumors 80 on the inner wall 70 of the airway are prevented from growing into the airway stent 100. Furthermore, a movable stent section 40 is provided at the end of the fixed stent section 30, and the radial dimension of the movable stent section 40 is set to be larger than that of the fixed stent section 30, thereby increasing the radial support force of the movable stent section 40 on the inner wall 70 of the airway and preventing displacement of the airway stent 100. Moreover, an open-shaped movable portion 41 is provided on the movable stent section 40 to provide more space when the movable stent section 40 deforms, reducing the stimulation of the movable stent section 40 on the inner wall 70 of the airway and preventing granulation tissue growth.

[0098] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An airway stent comprising a stent body and a covering disposed on the stent body, characterized in that, The stent body includes a fixed stent section and a movable stent section disposed at the end of the fixed stent section, and the covering is disposed on the fixed stent section; the movable stent section is provided with at least one open movable portion, the radial dimension of the movable stent section is larger than the radial dimension of the fixed stent section, the movable stent section includes at least one movable wave loop, the movable wave loop is provided with a movable portion, the movable wave loop includes a plurality of sequentially connected movable wave segments, the plurality of movable wave segments are connected end to end to form the movable wave loop, the movable wave segments include movable high wave segments and movable low wave segments, the axial height of the movable high wave segments is greater than the axial height of the movable low wave segments, the movable portion includes the movable low wave segments, and there is an opening between the movable low wave segments and other wave segments; the movable portion is used to be disposed at the location of the tumor, the movable portion can deform under the radial force of the airway stent and tilt towards the inner wall of the airway, and the open portion of the movable portion can conform to the shape of the tumor to cover the tumor.

2. The airway tube of claim 1, wherein, The movable part is disposed on the movable wave coil; the fixed support section includes a plurality of fixed wave coils connected in sequence.

3. The airway stent according to claim 2, characterized in that, The movable support segment includes a plurality of movable wave coils connected in sequence, wherein the radial dimension of the movable wave coils near the end of the support body is greater than the radial dimension of the movable wave coils away from the end of the support body.

4. The airway stent according to claim 2, characterized in that, The movable wave coil is provided with a plurality of movable parts, which are arranged circumferentially at intervals on the movable wave coil.

5. The airway stent according to claim 4, characterized in that, The fixed waveform loop includes several fixed waveform segments connected in sequence, and the fixed waveform segments are connected end to end to form a ring-shaped fixed waveform loop.

6. The airway stent according to claim 5, characterized in that, Adjacent active wave loops are connected by the active high-wave segment hooks.

7. The airway stent according to claim 6, characterized in that, The active high-wave segment includes an active high-wave peak, an active high-wave trough, and a high-wave connecting rod connecting the active high-wave peak and the active high-wave trough. Adjacent active wave loops are connected by hooks between adjacent active high-wave peaks and active high-wave troughs. The active low-wave segment includes an active low-wave peak, an active low-wave trough, and a low-wave connecting rod connecting the active low-wave peak and the active low-wave trough. The axial height between the active low-wave peak and the active low-wave trough is less than the axial height between the active high-wave peak and the active high-wave trough.

8. The airway stent according to claim 5, characterized in that, The fixed waveform segment includes fixed peaks, fixed troughs, and fixed connecting rods connecting the fixed peaks and fixed troughs. Adjacent fixed waveforms are connected by hooks between adjacent fixed peaks and fixed troughs.

9. The airway stent according to claim 1, characterized in that, The coating includes an outer film disposed on the outer surface of the fixed support section and an inner film disposed on the inner surface of the fixed support section. The inner film and the outer film are bonded and fixed together through the mesh of the fixed support section.

10. The airway stent according to claim 1, characterized in that, The stent body is also provided with an extension membrane covering the inner surface of the movable stent segment.

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