Bronchial implant

Abstract

The application provides a bronchial implant, comprising a wall body having a proximal end and a distal end opposite in direction; the wall body is provided with a through hole which is communicated with the proximal end and the distal end; the wall body is provided with a groove in the circumferential direction of the proximal end, the groove is arranged around the through hole and is spaced from the through hole, so as to form a first proximal end surface and a second proximal end surface at the proximal end, the first proximal end surface surrounds the second proximal end surface, and the second proximal end surface is recessed towards the distal end relative to the first proximal end surface, the length of the recess is greater than 0 mm and less than or equal to 6 mm. The bronchial implant provided by the application reserves a granulation tissue growth space and can guide the growth direction of the granulation tissue, so as to prevent the granulation tissue from affecting the normal work of the bronchial implant itself or other medical implants placed in the bronchial implant.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a bronchial implant. Background Technology

[0002] Bronchial implants generally serve functions such as support, isolation, one-way airflow, and drug delivery. Regardless of the specific function or combination thereof, bronchial implants will interact with the bronchi, especially at both ends of the implant.

[0003] Granulation tissue growth of bronchial implants is one of the existing long-term complications. Objectively speaking, as a foreign object, the bronchial implant will stimulate the body to produce an inflammatory response. Various inflammatory cells interact and eventually induce fibroblasts to proliferate continuously and collagen to be excessively secreted and deposited. Granulation tissue forms and blocks the bronchial implant, making the bronchial implant unable to work properly. The failed bronchial implant further aggravates the patient's disease. Excessively grown granulation tissue will also affect normal bronchial breathing after the implant is removed.

[0004] Existing bronchial implants typically do not provide space for granulation tissue growth, nor are they designed with corresponding structures to prevent granulation tissue from affecting the operation of the implant. Growing granulation tissue directly contacts and compresses the implant, causing greater irritation, making the implant prone to displacement, and rendering it ineffective. Furthermore, granulation tissue can easily overgrow into the working channel of the implant, blocking the working channel of the bronchial implant. A failed bronchial implant can further irritate the airway mucosa, causing inflammation and stimulating granulation tissue growth. Utility Model Content

[0005] This application proposes a bronchial implant to address the above problems.

[0006] The embodiments of this application achieve the above objectives through the following technical solutions.

[0007] A bronchial implant includes a wall having a proximal end and a distal end facing away from each other in a direction; the wall has a through hole communicating with the proximal end and the distal end; the wall has a circumferential groove at the proximal end, the groove being arranged around the through hole and spaced apart from the through hole to form a first proximal end face and a second proximal end face at the proximal end, the first proximal end face surrounding the second proximal end face, and the second proximal end face being recessed distally relative to the first proximal end face, the length of the recess being greater than 0 mm and less than or equal to 6 mm.

[0008] In some implementations, the through-hole is adapted for placement of a medical implant.

[0009] In some embodiments, the groove has a bottom surface that is a smooth curved surface.

[0010] In some embodiments, the maximum vertical distance between the first proximal end face and the bottom surface of the groove is 0.5 mm to 9 mm, and the maximum vertical distance between the second proximal end face and the bottom surface of the groove is 0.5 mm to 3 mm.

[0011] In some embodiments, the wall includes an outer wall and an inner wall, the outer wall connecting the bottom surface of the groove and the first proximal end face, the inner wall connecting the bottom surface of the groove and the second proximal end face, the inner wall including the groove surface, and the angle between the groove surface and the second proximal end face being 105° to 115°.

[0012] In some embodiments, the outer wall is surrounded by a groove, the inner wall is surrounded by a through hole, the thickness of the outer wall is 1 mm, and the minimum thickness of the inner wall is greater than 0 mm and the maximum thickness is 2.5 mm.

[0013] In some embodiments, the wall includes at least one reinforcing rib disposed between the outer wall and the inner wall.

[0014] In some implementations, the distal surface of the bronchial implant is curved, with the curved surface concave towards the proximal end.

[0015] In some implementations, the arc length of the curved surface accounts for 22% to 34% of the circumference of the circle to which it belongs.

[0016] In some implementations, the diameter of the through hole gradually increases from the proximal end to the distal end, or the inner wall of the through hole is a regular curved surface or an irregular curved surface.

[0017] Compared to existing technologies, the bronchial implant provided in this application reserves space for granulation tissue growth, which can guide the growth direction of granulation tissue and prevent granulation tissue from affecting the normal operation of the bronchial implant. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the bronchial implant provided in the embodiments of this application;

[0020] Figure 2 yes Figure 1 A schematic cross-sectional view of the bronchial implant shown.

[0021] Figure 3 This is a schematic diagram of the bronchial implant provided in the embodiments of this application;

[0022] Figure 4This is a schematic diagram of the use state of a bronchial implant provided in another embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the bronchial implant provided in the embodiments of this application;

[0024] Figure 6 yes Figure 5 A top view of the bronchial implant shown;

[0025] Figure 7 This is a schematic diagram of a bronchial implant provided in another embodiment of this application;

[0026] Figure 8 This is a schematic diagram of a bronchial implant provided in another embodiment of this application;

[0027] Figure 9 yes Figure 8 A partially enlarged schematic diagram of the bronchial implant shown;

[0028] Figure 10 This is a schematic diagram of a bronchial implant provided in another embodiment of this application;

[0029] Figure 11 This is a schematic diagram of a bronchial implant provided in another embodiment of this application. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. Furthermore, all other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0031] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0033] Please see Figure 1 and Figure 2This application provides a bronchial implant 1, including a wall 10. The wall 10 has a proximal end N and a distal end F facing away from each other in a direction. The wall 10 has a through hole 30 connecting the proximal end N and the distal end F. The wall 10 has a groove 20 circumferentially arranged around the through hole 30 and spaced apart from the through hole 30 to form a first proximal end face 1011 and a second proximal end face 1021 at the proximal end N. The first proximal end face 1011 surrounds the second proximal end face 1021, and the second proximal end face 1021 is recessed towards the distal end F relative to the first proximal end face 1011. The length of the recess is greater than 0 mm and less than or equal to 6 mm. The specific recess length is determined according to actual needs. The bronchial implant 1 can be a stent, a bronchial plug, a one-way valve, or a drug-eluting implant, etc. The bronchial implant 1 can have different sizes depending on the application environment (e.g., the size of the bronchus where the treatment site is located) and the treatment purpose (e.g., various bronchial diseases).

[0034] In this application, when describing the bronchial implant 1, "proximal N" refers to the side of the bronchial implant 1 located on the delivery device or in the direction of the end operated by the user, and correspondingly, "distal F" refers to the side of the bronchial implant 1 away from the delivery device or in the direction of the end operated by the user. "Axial" refers to the direction between "proximal N" and "distal F".

[0035] The proximal N and distal F ends of the bronchial implant 1 are not closed. A through-hole 30 extends through both the proximal N and distal F ends to facilitate normal gas and fluid exchange within the lungs, ensuring the proper functioning of the bronchial implant 1, or to accommodate other medical implants 2. The through-hole 30 can be located at the center of the entire bronchial implant 1, becoming a central through-hole 30. The shape of the through-hole 30 is not limited; it can be cylindrical, frustum-shaped, rugby ball-shaped, or a custom-designed shape.

[0036] After the bronchial implant 1 is inserted into the patient's bronchus, when the body inhales, fluid enters the through-hole 30 and flows from the proximal N to the distal F. The bronchial implant 1 can be a stent.

[0037] Because the proximal end N of the bronchial implant 1 has a groove 20, and the first proximal surface 1011 on the outer side is more convex than the second proximal surface 1021 on the inner side, the outer wall 101 is significantly longer than the inner wall 102. This not only delays the invasion of granulation tissue into the through-hole 30, but also guides the granulation tissue to grow into the groove 20, making it less likely to invade the through-hole 30, thus keeping the through-hole 30 unobstructed. The groove 20 can also guide the flow of mucus in the bronchus, reducing the amount of mucus entering the through-hole 30 structure. At the same time, the growth of granulation tissue near the proximal end N is guided by the structure of the groove 20 and the proximal end N, preventing the granulation tissue from growing into the through-hole 30. Therefore, the bronchial implant 1 provided in this application reserves space for granulation tissue growth and can guide the growth direction of granulation tissue, preventing granulation tissue from affecting the normal operation of the bronchial implant 1 itself or other medical implants 2 placed inside it.

[0038] Please see Figure 2 In some embodiments, the groove 20 has a bottom surface 201, which is a smooth curved surface. The groove 20 serves as a reserved space for granulation tissue growth. When the bottom surface 201 is a smooth curved surface, the groove 20 has higher stability, and the smooth curved surface has no dead corners, so liquid or gas in the bronchus is less likely to accumulate at the bottom of the groove 20, reducing bacterial growth.

[0039] In some embodiments, the maximum vertical distance between the first proximal end face 1011 and the bottom surface 201 of the groove is 0.5 mm to 9 mm, and the maximum vertical distance between the second proximal end face 1021 and the bottom surface 201 of the groove is 0.5 mm to 3 mm, so that the groove 20 has a predetermined depth to guide the growth of granulation tissue.

[0040] Furthermore, the wall 10 includes an outer wall 101 and an inner wall 102. The outer wall 101 connects the bottom surface 201 of the groove and the first proximal end surface 1011. The inner wall 102 connects the bottom surface 201 of the groove and the second proximal end surface 1021. The inner wall 102 includes a groove surface 1022, which is the surface facing the groove 20. The angle θ between the groove surface 1022 and the second proximal end surface 1021 is 105° to 115°. The outer wall 101 and the inner wall 102 are opposite each other, with the groove 20 between them. The outer wall 101 is parallel or substantially parallel to the central axis of the bronchial implant 1. The groove surface 1022 of the inner wall 102 on the side near the groove 20 is inclined relative to the central axis. The included angle θ makes it difficult for granulation tissue to extend from the groove 20 toward the through hole 30. Moreover, compared with the groove 20 which is parallel to the central axis, this groove 20 which is inclined relative to the central axis has less impact on the airflow in the bronchus and is less likely to create dead corners, thus avoiding the accumulation of bacteria in the bronchus.

[0041] In other embodiments, the included angle between the groove surface 1022 and the second near end face 1021 can also be 90°, 120°, etc.

[0042] In other embodiments, the groove surface 1022 can also be a regular curved surface or an irregular curved surface, depending on the need.

[0043] In some embodiments, the outer wall 101 surrounds the groove 20, and the inner wall 102 surrounds the through hole 30. The thickness of the outer wall 101 is 1 mm, and the minimum thickness of the inner wall 102 is greater than 0 mm, while the maximum thickness is 2.5 mm. "Thickness" refers to the length obtained by cutting the inner wall 102 or the outer wall 101 with a cross-section perpendicular to the central axis of the bronchial implant 1. Because the inner wall 102 is inclined relative to the central axis, its thickness gradually increases from the proximal end N to the distal end F, with a minimum thickness greater than 0 and a maximum thickness controllable at 2.5 mm. In other embodiments, when the inner wall 102 is parallel to the central axis, the thickness can be the same everywhere.

[0044] Please see Figure 3 In some embodiments, the wall 10 can be made thicker or thinner as needed, and the length of the through hole 30 can be made longer or shorter as needed.

[0045] Please see Figure 4 In some embodiments, the through-hole 30 is adapted to accommodate a medical implant 3. When the bronchial implant 1 is large in size and the diameter of the through-hole 30 is also large, other existing medical implants 3 (such as stents, valves, or smaller bronchial implants 1) can be placed. These existing medical implants 3 generally do not have the function of delaying the invasion of granulation tissue into the working channel, or their ability to resist granulation tissue invasion is insufficient. Therefore, they can be protected by the bronchial implant 1 provided in this application, so as to extend the working life of various medical implants 3 embedded in the through-hole 30.

[0046] Please see Figure 5 and Figure 6 The bronchial implant 1 includes at least one reinforcing rib 12, which is disposed between the outer wall 101 and the inner wall 102 to enhance the structural stability of the groove 20. When there are multiple reinforcing ribs 12 (e.g., 3 to 6), they are evenly distributed circumferentially in the through hole 30 to enhance the radial force of the proximal N and prevent the proximal N portion from collapsing inward under the pressure of the bronchial wall, thus causing deformation of the working channel.

[0047] Please continue reading. Figure 2 In some embodiments, the outer wall 101 has a taper C at its proximal end N, where the taper C is 0.3 to 0.5. The taper C allows the proximal end N of the outer wall 101 to conform to the bronchial wall, but also maintains a certain gap with the bronchial wall, ensuring that the bronchial implant 1 can reduce radial irritation to the bronchus when it is displaced within the bronchus. When the bronchial implant 1 fails, the outer wall 101 with the taper C makes the bronchial implant 1 easier to remove.

[0048] Please see Figure 7 The bronchial implant 1 has an arc surface 40 at the distal F end, which is concave towards the proximal N end. When the bronchial implant 1 is cylindrical in shape, after fitting against the bronchial wall, the concave arc surface 40 creates a certain space between the wall 10 at the distal F end and the bronchial wall, preventing granulation tissue near the distal F end from growing into the through-hole 30.

[0049] In some embodiments, the arc length of the arc surface 40 accounts for 22% to 34% of the circumference of the circle to which it belongs. The arc length of the arc surface 40 is the length of a two-dimensional line arc. In some embodiments, the radius r of the "circle" referred to herein ranges from 1 mm to 3.4 mm, preferably from 2 mm to 2.4 mm.

[0050] Within the 22%–34% range, the space volume formed between the arc surface 40 and the bronchial wall can be controlled between 40 and 60 cubic millimeters. Granulation tissue can grow within this space, thus preventing it from entering the central through-hole 30 and affecting the function of the bronchial implant 1. If the arc length is too small a proportion of the circle, granulation tissue will grow into the central through-hole 30 prematurely. If the arc length is too large a proportion of the circle, the structure of the distal F will be too soft, and the radial direction will not be well supported. Furthermore, during the implantation of the bronchial implant 1 into the bronchus, the distal F is more prone to deformation, especially at bronchial branches, where it is more likely to get stuck at the bronchial branch opening and fail to be implanted at the target location. Therefore, the presence of this arc surface 40 maintains a radial distance of 2mm-3mm between the distal end F and the bronchial wall, which is slightly narrower than the bronchial wall, making it easier to implant into the target position. Moreover, when the bronchial implant 1 reaches the target position, due to the presence of the arc surface 40, the distal end F is suspended in the airway relative to other parts, without contacting the airway wall, thereby guiding granulation tissue to grow along the gap. The granulation tissue adheres to the arc surface 40 and is subjected to force by the arc surface 40, guiding the growth direction of the granulation tissue, causing the granulation tissue to gradually grow towards the distal end F of the bronchial implant 1, delaying the time for the guided granulation tissue to grow into the through hole 30, and extending the working life of the bronchial implant 1. In addition, the growth of granulation tissue will cause compression to the distal end F, and the arc surface 40 can disperse the compressive force of the granulation tissue, ensuring the overall structural stability of the distal end F.

[0051] Please see Figure 7In some embodiments, the arc surface 40 is further provided with a plurality of concave points 401 to increase the growth space of granulation tissue and delay the time when granulation tissue affects the operation of the central channel; the depth of the concave points 401 can be 0.05mm to 0.4mm, preferably 0.1mm to 0.3mm. Concave points 401 that are too small cannot affect the growth of granulation tissue, while concave points 401 that are too large can easily affect the strength of the distal F, causing the bronchial implant 1 to deform under stress at the bronchial branch when implanted into the bronchus, get stuck at the bronchial branch opening, and cause the bronchial implant 1 to fail to implant.

[0052] Furthermore, the connection between the arc surface 40 and the wall 10 at the distal end F is rounded, and the edge of the concave point 401 is also rounded, which can reduce the stimulation of the distal end F on the bronchial wall. At the same time, when the bronchial implant 1 is located in a curved bronchus, the distal end F is likely to touch the bronchial wall. By increasing the concave point 401, the stimulation of the distal end F on the bronchial wall is reduced, and the formation of granulation tissue is slowed down.

[0053] Furthermore, the specific structure of the concave point 401 is not limited to the dot-shaped groove 20, but can also be honeycomb-shaped, inwardly concave frustum, etc., and can be distributed evenly or non-uniformly to cover the arc surface 40, increasing the surface area of ​​the arc surface 40. Moreover, multiple concave points 401 can also be connected by the arc surface 40, or the edges can be chamfered or made into a smooth surface.

[0054] In other embodiments, the dimples 401 may also be distributed on the inner wall 102 or outer wall 101 of the proximal N to reduce the contact area with the bronchial wall, reduce the stimulation of the proximal N on the bronchial wall, and slow down the growth of granulation tissue.

[0055] Please see Figure 7 In some embodiments, the junction of the arc surface 40 and the wall 10 at the distal end F is rounded to reduce frictional irritation, prevent damage to the airway wall, and make the transition between the distal end F and the branch opening smoother and easier to administer. The radius R of this rounded corner can range from 1 mm to 4.2 mm, preferably from 2 mm to 3.2 mm. For example, 3.04 mm is used. This radius of the rounded corner is designed based on the numerical relationship between the structural characteristic parameters of the arc surface 40 and the forces acting on granulation tissue growth.

[0056] In some implementations, the arc surface 40 of the distal end F can be deformed into a combination of multiple circular arcs, a combination of multiple curved surfaces, etc.

[0057] In some implementations, a more fitting curved surface 40 can be designed according to different human anatomical structures, so that when the bronchial implant 1 is at an angle to the bronchial wall, it can fit the bronchial wall more closely.

[0058] In some embodiments, the wall 10 of the bronchial implant 1 may have uneven thickness in the circumferential direction, for example, a thinner structure on one side and a thicker structure on the other. The thicker side provides support during the insertion of the bronchial branch, ensuring successful insertion. The thinner side allows sufficient space for granulation tissue growth at the distal end F of the bronchial implant 1.

[0059] Please see Figure 8 Another bronchial implant 2 provided in this application embodiment includes an outer surface 50 and a raised support portion 60. The raised support portion 60 is disposed on the outer surface 50 to form a gap between the wall 10 and the inner wall of the bronchus. The raised support portion 60 is a flexible structure. After contacting the bronchus, the gap between the bronchus and the outer surface 50 is formed with the support of the raised support portion 60. This gap can provide space for granulation tissue growth. At the same time, the contact area between the bronchial implant 2 and the bronchial wall is reduced, reducing stimulation to the bronchial wall and reducing or slowing down granulation tissue growth, thus reducing radial force. The surface of the flexible raised support portion 60 is a smooth arc shape, which can achieve more suitable radial support force. When a person coughs, it reduces the axial displacement distance of the bronchial implant 2. The smooth line can conform to the bronchus, reducing repeated friction of the bronchial implant 2 on the bronchus, reducing stimulation to the bronchial wall, and reducing the probability of granulation tissue growth.

[0060] The distribution area of ​​the protruding support portion 60 accounts for 4% to 9% of the area of ​​the outer surface 50, preferably 5% to 7%.

[0061] Please see Figure 8 and Figure 9 In this embodiment, the protruding support portion 60 includes multiple microneedle structures 601; each microneedle structure 601 includes a needle tip 6011, which is inclined proximally to the N. The height of each microneedle structure 601 is 0.45mm to 0.75mm, allowing it to conform to the bronchus. The microneedle structure 601 is hollow and can be used to insert drugs. The specific shape of the microneedle structure 601 needs to be adapted according to different bronchial sizes. The microneedle structure 601 is used to pierce the bronchial wall, fixing the bronchial implant 2 within the target bronchus. The number of microneedle structures 601 can be set as needed; fewer microneedles can be distributed on the outer surface 50 to prevent granulation tissue proliferation.

[0062] In some embodiments, when the microneedle structure 601 is made of silicone, it can bend and deform with the compression of the bronchus during breathing, reducing the radial force on the bronchial implant 2 and reducing the formation of granulation tissue. The needle tip 6011 of the flexible microneedle structure 601 can be uniformly biased in the proximal N direction, so that the axial displacement can be better resisted when coughing occurs in the bronchus.

[0063] In other embodiments, the protruding support portion 60 may include multiple spherical protrusions; the bottom radius of the spherical protrusions is 0.1mm to 0.7mm, preferably 0.3mm to 0.6mm; the protrusion height of the spherical protrusions is 0.2mm to 0.6mm, preferably 0.3mm to 0.5mm. If the contact area between the protruding support portion 60 and the bronchial wall is too small, it cannot fit the bronchial wall properly, and the friction between them is too small, making the bronchial implant 2 prone to displacement during respiratory movements, leading to failure; if the contact area between the protruding support portion 60 and the bronchus is too large, it can easily irritate the bronchial wall, and the excessive friction between them is not conducive to the placement and removal of the bronchial implant 2.

[0064] Multiple spherical protrusions are evenly or non-uniformly distributed on the outer surface 50, and the distance between two adjacent spherical protrusions is 1mm to 3mm, preferably 2mm.

[0065] Please see Figure 10 In some embodiments, the diameter of the through-hole 30 can gradually increase from the proximal end N to the distal end F. Furthermore, medication for treating bronchial diseases can be placed within the enlarged through-hole 30.

[0066] The number of through holes 30 can be one, but in some implementations, please refer to [reference needed]. Figure 11 The through-hole 30 can also be divided into multiple different working channels, such as working channel 301 and working channel 302, so that the fluid exchange in the bronchus is affected by different working channels to achieve the treatment goal.

[0067] The inner wall of the through hole 30 can be a regular curved surface or an irregular curved surface to accommodate medical implants 3 of different shapes (such as stents or valves).

[0068] The bronchial implant 1 or bronchial implant 2 is made of any one of the following materials or any combination of two or more of the following materials: silicone, silicone, expanded polytetrafluoroethylene, nickel-titanium alloy or silk fibroin. These materials have good biocompatibility and elasticity and can reduce irritation to the bronchi.

[0069] The bronchial implant provided in this application has reserved space for granulation tissue growth and can guide the growth direction of granulation tissue to prevent granulation tissue from affecting the normal operation of the bronchial implant itself or other medical implants placed inside it.

[0070] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A bronchial implant, characterized in that, The device includes a wall having a proximal end and a distal end facing away from each other in a direction; the wall has a through hole communicating with the proximal end and the distal end; the wall has a circumferential groove at the proximal end, the groove being arranged around the through hole and spaced apart from the through hole to form a first proximal end face and a second proximal end face at the proximal end, the first proximal end face surrounding the second proximal end face, and the second proximal end face being recessed relative to the first proximal end face towards the distal end, the length of the recess being greater than 0 mm and less than or equal to 6 mm.

2. The bronchial implant according to claim 1, characterized in that, The through-hole is adapted for placing medical implants.

3. The bronchial implant according to claim 1, characterized in that, The groove has a bottom surface, which is a smooth curved surface.

4. The bronchial implant according to claim 3, characterized in that, The maximum vertical distance between the first proximal end face and the bottom surface of the groove is 0.5mm to 9mm, and the maximum vertical distance between the second proximal end face and the bottom surface of the groove is 0.5mm to 3mm.

5. The bronchial implant according to claim 3, characterized in that, The wall includes an outer wall and an inner wall. The outer wall connects the bottom surface of the groove and the first proximal end surface. The inner wall connects the bottom surface of the groove and the second proximal end surface. The inner wall includes a groove surface. The angle between the groove surface and the second proximal end surface is 105° to 115°.

6. The bronchial implant according to claim 5, characterized in that, The outer wall surrounds the groove, the inner wall surrounds the through hole, the thickness of the outer wall is 1 mm, and the minimum thickness of the inner wall is greater than 0 mm and the maximum thickness is 2.5 mm.

7. The bronchial implant according to claim 5, characterized in that, The wall includes at least one reinforcing rib, which is disposed between the outer wall and the inner wall.

8. The bronchial implant according to claim 1, characterized in that, The bronchial implant has an arc-shaped surface at its distal end, and the arc-shaped surface is concave towards the proximal end.

9. The bronchial implant according to claim 8, characterized in that, The arc length of the arc surface accounts for 22% to 34% of the circumference of the circle to which it belongs.

10. The bronchial implant according to claim 1, characterized in that, The diameter of the through hole gradually increases from the proximal end to the distal end, or the inner wall of the through hole is a regular curved surface or an irregular curved surface.

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