Covered stent

Abstract

The covered stent comprises a main stent body and a branch stent body, the main stent body comprises a branch opening communicated with the branch stent body, the branch stent body comprises a first end and a second end which are opposite, the first end is connected to the branch opening, and the second end is connected to the branch opening. The branch support comprises an adjusting section close to the first end and a supporting section close to the second end, and the adjusting section comprises reinforcing ribs so that the supporting section can be driven to sink when the branch support is stressed. According to the covered stent provided by the invention, the reinforcing ribs are arranged on the adjusting sections, so that the supporting sections can be driven to sink when the branch stents are stressed, and therefore, the covered stent provided by the invention can be flexibly adjusted and positioned, the positioning accuracy requirement of the stent is reduced, the blood flow of the aorta and the branch arteries is not influenced, and the construction of the branch guide wires is not influenced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a covered stent. Background Art

[0002] The branch stent reconstruction technology has become one of the mainstream technologies for endovascular branch reconstruction. However, there are two major difficulties in the current branch stent reconstruction technology. One is the high requirement for the positioning accuracy of the stent with branches. The other is that although the stent with inner branches can reduce the requirement for positioning accuracy when connecting to the external branch stent, the inner branch stent occupies the space of the main lumen and affects the hemodynamics of the main lumen. Summary of the Invention

[0003] One technical problem solved by the present invention is how to provide a covered stent that can flexibly adjust the positioning, reduce the requirement for the positioning accuracy of the stent, and at the same time does not affect the blood flow of the aorta and branch arteries, nor does it affect the construction of the branch guide wire.

[0004] The present invention provides a covered stent, which includes a main stent and a branch stent. The main stent includes a branch opening communicating with the branch stent. The branch stent includes opposite first and second ends. The first end is connected to the branch opening. The branch stent includes an adjustment section near the first end and a support section near the second end. The adjustment section includes a reinforcing rib so that when the branch stent is stressed, it can drive the support section to sink.

[0005] In one embodiment, the adjustment section further includes a connecting membrane connecting the branch opening and the support section. The reinforcing rib is arranged on the connecting membrane, and the reinforcing rib is a flexible reinforcing rib.

[0006] In one embodiment, the reinforcing rib has a "chain-type" broken point structure or broken section structure.

[0007] In one embodiment, the reinforcing rib includes a first section and a second section along its extending direction, and a gap is provided between the first section and the second section.

[0008] In one embodiment, the reinforcing rib includes a sewing thread sewn along the connecting membrane;

[0009] Or, the connecting membrane includes a folding part, and the folding part is thermally pressed and bonded to form the reinforcing rib;

[0010] Or, the connecting membrane includes a folding part, the reinforcing rib includes the folding part and a sewing thread, and the sewing thread is sewn along the folding part to form a whole to form the reinforcing rib.

[0011] In one embodiment, at least two reinforcing ribs are arranged at intervals along the circumferential direction of the branch stent.

[0012] In one embodiment, the branch stent includes a first circumferential support member disposed circumferentially along the branch stent, and the first circumferential support member is disposed at the connection between the adjustment section and the support section.

[0013] In one embodiment, the branch stent further includes a second circumferential support member and a third circumferential support member. The second circumferential support member is disposed at the first end, and the third circumferential support member is disposed at the second end.

[0014] In one embodiment, it is defined that the diameter of the first circumferential support member is D1, the diameter of the second circumferential support member is D2, and the diameter of the third circumferential support member is D3. The D1, D2, and D3 satisfy: D1 ≤ D3 < D2;

[0015] Or, the D1, D2, and D3 satisfy: D1 ≤ D3, and 1.5D1 ≤ D2 ≤ 3D1.

[0016] In one embodiment, the reinforcing rib includes a first end portion and a second end portion. The first end portion is close to the first end, and the second end portion is close to the second end. There is a gap between the first end portion and the first end of the branch stent and / or there is a gap between the second end portion and the adjustment section.

[0017] One technical effect of an embodiment of the present invention is that by providing a reinforcing rib in the adjustment section, the branch stent can drive the support section to sink when stressed, thereby providing a covered stent that can not only flexibly adjust the positioning, reduce the requirements for the positioning accuracy of the stent, but also does not affect the blood flow in the aorta and branch arteries, and does not affect the construction of the branch guide wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a covered stent provided by the present invention;

[0019] Figure 2 is a schematic structural diagram of a branch stent provided by the present invention;

[0020] Figure 3 is Figure 2 a top view of;

[0021] Figure 4 is a schematic structural diagram of another branch stent provided by the present invention;

[0022] Figure 5 is Figure 1 a schematic diagram of the branch stent of the covered stent provided by Figure 1 sinking into the main stent cavity after being subjected to the force shown by F1 in;

[0023] Figure 6 For Figure 1 the provided covered stent, the branch stent is subjected to Figure 1 the force shown in F2 in the figure, and the schematic diagram of the branch stent sinking into the main stent cavity;

[0024] Figure 7 The schematic structural diagram of another branch stent provided by the present invention;

[0025] Figure 8 For Figure 7 the enlarged view of the position A in the figure;

[0026] Figure 9 For Figure 7 the enlarged view of another embodiment of the position A in the figure;

[0027] Figure 10 For Figure 9 the top view;

[0028] Figure 11 For Figure 7 the enlarged view of another embodiment of the position A in the figure;

[0029] Figure 12 For Figure 11 the top view;

[0030] Figure 13 The top view of a branch stent provided by the present invention (looking from the second end of the branch stent to the first end);

[0031] Figure 14 For Figure 13 the schematic diagram when the first section of the provided branch stent turns down;

[0032] Figure 15 For Figure 14 the schematic diagram when the second section also turns down on the basis of the above;

[0033] Figure 16 For Figure 14 the schematic diagram when the support section tilts relative to the second section on the basis of the above;

[0034] Figure 17 For Figure 14 the schematic diagram when the micro "cradle" structure swings horizontally to the left in the figure on the basis of the above;

[0035] Figure 17a For Figure 17 the top view schematic diagram of the branch stent in the figure;

[0036] Figure 18 For Figure 14 the schematic diagram when the micro "cradle" structure swings horizontally to the right in the figure on the basis of the above;

[0037] Figure 18a is Figure 18 a top view schematic diagram of the middle branch stent;

[0038] Figure 19 is a schematic structural diagram of an aortic arch stent provided by the present invention;

[0039] Figure 20 is a schematic structural diagram of a thoracic and abdominal main stent provided by the present invention;

[0040] Figure 21 is a schematic structural diagram of an abdominal main stent provided by the present invention.

[0041] 100, covered stent; 10, main stent; 11, branch opening; 12, first bare wave ring; 13, main wave ring; 14, main covering film; 20, branch stent; 20a, first end; 20b, second end; 21, adjustment section; 211, connecting film; 2111, folding part; 212, reinforcing rib; 212a, first section; 212b, second section; 2121, first end part; 2122, second end part; 22, support section; 22a, proximal end; 22b, distal end; 221, support covering film; 222, support wave ring;

[0042] 23, first circumferential support member; 24, second circumferential support member; 25, third circumferential support member; Detailed Embodiment

[0043] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "inner", "outer", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. The axial direction of the branch stent defined by the present invention refers to the direction along the tubular extension of the branch stent, and the radial direction of the branch stent is perpendicular to its axial space; the axial direction of the main stent refers to the direction along the tubular extension of the main stent.

[0045] The present invention provides a covered stent 100, as Figure 1As shown, the covered stent 100 includes a main stent 10 and a branch stent 20. The main stent 10 is a tubular structure with openings at both ends, and includes a first bare coil 12, main coils 13 and a main covering film 14. Among them, there are multiple main coils 13, and the multiple main coils 13 are arranged along the axial direction of the main stent 10 and are connected by the tubular main covering film 14. The number of main coils 13 can be reasonably set according to the axial length of the main stent 10 in combination with the coil height of the coils, and the branch opening 11 is avoided, so as to facilitate the connection of the branch stent 20 to the branch opening 11 and make the main cavity of the main stent 10 communicate with the cavity of the branch stent 20.

[0046] The axial length of the main stent 10 can be set to: 40 mm to 240 mm. The first bare coil 12 is arranged on the proximal side of the main coil 13 and is connected to the proximal edge of the main covering film 14. In other embodiments, the first bare coil 12 may not be provided. At this time, the proximal end of the covering film is the proximal end of the main stent 10.

[0047] In this embodiment, the main coils 13 are arranged outside the main covering film 14. When implanted into the blood vessel, the friction between the main stent 10 and the inner wall of the blood vessel can be enhanced, which is beneficial to preventing the main stent 10 from shifting or shortening relative to the inner wall of the blood vessel. In other embodiments, the main coils 13 may also be arranged inside the main covering film 14, or part of the main coils 13 are arranged inside the main covering film 14 and part are arranged outside the main covering film 14, which is not limited here.

[0048] As Figure 1-2 shown, the branch stent 20 includes opposite first end 20a and second end 20b. The first end 20a can be sutured and connected to the branch opening 11 of the main stent 10 in a circumferential manner by sutures. The branch stent 20 further includes an adjustment section 21 and a support section 22. The adjustment section 21 is close to the first end 20a of the branch stent 20, and the support section 22 is close to the second end 20b of the branch stent 20. Among them, the support section 22 includes a support covering film 221 and support coils 222. The support covering film 221 covers the inside or outside of the support coils 222. The edge of the support coil 222 close to the first section 212a is flush or nearly flush with the edge of the support covering film 221 on the same side. The edge of the support coil 222 close to the second end 20b is flush or nearly flush with the edge of the support covering film 221 on the same side. Among them, nearly flush means that the edge dislocation does not exceed 1 mm, so that the support effect of the support coil 222 on the edge of the support section 22 is better.

[0049] As Figure 2-3As shown, the adjustment section 21 includes a connecting membrane 211 and reinforcing ribs 212 provided on the connecting membrane 211. In this embodiment, the adjustment section 21 is connected to the support section 22, and the connecting membrane 211 connects the branch opening 11 and the support section 22. Among them, the support membrane 221 is connected to the connecting membrane 211 to form the branch membrane of the branch stent 20. The support coil 222 includes at least one waveform ring, and the waveform ring extends in a waveform along the circumference of the tubular support membrane 221 (i.e., the circumference of the branch stent 20) for one week to support the support membrane 221 and maintain the lumen of the branch stent 20 at the same time. In this embodiment, the axial length range of the branch stent 20 is: 5 mm to 40 mm, where the axial length range of the adjustment section 21 in the branch stent 20 is: 3 mm to 20 mm; the axial length range of the support section 22 in the branch stent 20 is: 2 mm to 20 mm.

[0050] In this embodiment, the reinforcing rib 212 extends on the connecting membrane 211 from the first end 20a towards the second end 20b, or the reinforcing rib 212 extends from the second end 20b towards the first end 20a. The extension direction here only represents the extension direction of the length of the reinforcing rib 212 and does not represent the starting and ending directions when the reinforcing rib 212 extends. So that when the second end 20b of the branch stent 20 or the side of the branch stent 20 is stressed, the reinforcing rib 212 gives support to the connecting membrane 211, causing the reinforcing rib 212 to rotate relative to the first end 20a, thereby driving at least part of the support section 22 to sink to the adjustment section 21, and at the same time preventing the connecting membrane 211 from stacking axially due to the connecting membrane 211 being too soft to provide axial support along the branch stent 20. If the connecting membrane 211 of the adjustment section 21 stacks axially when constructing the branch guide wire, the stacked connecting membrane 211 will easily make it difficult for the branch guide wire to advance.

[0051] In other embodiments, other parts of the reinforcing rib except for the two ends connected to the connecting membrane can also be suspended from the connecting membrane, which can also play a role in supporting the connecting membrane by the reinforcing rib axially in the branch stent, so as to facilitate the rotation of the reinforcing rib relative to the first end, and this is not limited here.

[0052] As Figure 2-3 shown, the support section 22 can be a tubular structure with an equal diameter. The support section 22 includes a distal end portion 22b away from the main body stent 10 and a proximal end portion 22a close to the main body stent 10. Among them, the distal end portion 22b and the proximal end portion 22a are concentric and have the same diameter so that the support section 22 forms a lumen with an equal diameter. In other embodiments, the support section 22 can also be a tubular structure with a non-equal diameter; when the support section 22 is a tubular structure with a non-equal diameter, the diameter of the annular opening of the proximal end portion 22a of the support section 22 is less than or equal to the diameter of the annular opening of the distal end portion 22b of the support section 22 (i.e., the end portion of the second end 20b of the branch stent 20), as Figure 4As shown, the support section 22 can be in the shape of an inverted frustum with a gradually increasing diameter from the proximal end 22a towards the distal end 22b, and the axial angle α between the side of the support section 22 and the branch stent 20 is less than or equal to the axial angle β between the side of the adjustment section 21 and the branch stent 20. This is to ensure that after the support section 22 sinks into the turned-down adjustment section 21, there is still extra space in the turned-down adjustment section 21 for the support section 22 to tilt circumferentially and swing flexibly. The support section 22 can also be in the shape of a drum with a larger diameter in the middle and smaller diameters at both ends, which is more conducive to the support section 22 sinking relative to the adjustment section 21 and facilitating the flexible rotation of the support section 22 along the circumference of the branch stent 20.

[0053] As Figure 2-3 and Figure 5 combined Figure 1 shown, when a downward force from top to bottom in Figure 1 acts on the second end 20b of the branch stent 20, the direction of the force is as shown by the arrow F1 in Figure 1 . The reinforcing rib 212 of the adjustment section 21 rotates relative to the first end 20a, causing the adjustment section 21 to rotate from the outside of the main stent 10 towards the inside of the main stent 10, thereby driving the entire support section 22 to sink into the cavity of the main stent 10, as shown in Figure 5 . Since the sunken support section 22 can swing flexibly, when the branch guide wire passes through the sunken support section 22, according to the direction of the branch guide wire, the support section 22 can be pulled by the branch guide wire to cause the support section 22 to tilt towards the direction of the branch vessel opening. In this embodiment, it is also possible to set the heights of the adjustment section 21 and the support section 22 in the axial direction of the branch stent 20 to be equal. When the adjustment section 21 turns into the cavity of the main stent 10 and simultaneously drives the support section 22 to sink, the second end 20b of the branch stent 20 just sinks to be flush with the side of the main stent 10, as shown in Figure 5 . In other embodiments, it is also possible to set the height of the adjustment section 21 in the axial direction of the branch stent 20 to be greater than the height of the support section 22 in the axial direction of the branch stent 20, so that when the branch stent 20 sinks into the cavity of the main stent 10, the situation of squeezing the branch stent 20 due to the narrow space of the aortic true lumen can be avoided.

[0054] As Figure 6 combined Figure 1 shown, when the branch stent 20 is subjected to a lateral force, as shown by the direction of the arrow F2 in Figure 1 , the reinforcing rib 212 on the side opposite to the force application point rotates relative to the corresponding position of the first end 20a, causing the adjustment section 21 on the side opposite to the force application point ( Figure 1 the right side of the branch stent 20) to drive the support section 22 on that side to sink, so that the adjustment section 21 tilts towards the side opposite to its force application point ( Figure 1 the left side of the branch stent 20) (the right side), as shown in Figure 6As shown. Among them, since there is no circumferential corrugated support in the adjustment section 21, when the second end 20b or the side of the branch bracket 20 is stressed, the lumen of the adjustment section 21 is a shaped tube and cannot be pressed down. The reinforcing rib 212 extends in this direction. Combining the flexibility of the connecting membrane 211, the adjustment section 21 can be at least partially folded into the cavity of the main bracket 10 due to the stress to facilitate adjusting the direction of the port of the second end 20b of the branch bracket 20, or sinking the support section 22 along the axis of the branch bracket 20 closer to the main bracket 10 or even being entirely recessed into the cavity of the main bracket 10. Since the support section 22 has its own support property, it only approaches the cavity of the main bracket 10 in position while maintaining its original shape.

[0055] As Figure 7As shown, the branch stent 20 includes a first circumferential support member 23 disposed circumferentially along the branch stent 20. The first circumferential support member 23 is provided at the connection between the adjustment section 21 and the support section 22. In this embodiment, the first circumferential support member 23 can be formed by suturing a suture along the circumference of this connection. The support membrane 221 and the connection membrane 211 can be two separate membranes sutured together, or they can be an integral membrane, and then sutured along the circumference at the boundary between the two. The first circumferential support member 23 can be continuously sutured along the circumference or discontinuously sutured. There is no limitation here, as long as a support other than the membrane is sutured along the circumference at this connection; in other embodiments, the first circumferential support member 23 can be a plurality of discontinuous developing arcs arranged at intervals along the circumference, or a continuous developing ring, and then the developing arcs or the developing ring are sutured at this connection to provide support other than the membrane at this connection. When the circumferential support member is a discontinuous arc, its diameter is the diameter of the circle corresponding to this arc. The branch stent 20 further includes a second circumferential support member 24 and a third circumferential support member 25. The second circumferential support member 24 is provided at the first end 20a of the branch stent 20 (i.e., the end of the adjustment section 21 away from the support section 22), and the third circumferential support member 25 is provided at the second end 20b of the branch stent 20 (i.e., the end of the support section 22 away from the adjustment section 21, that is, the distal end 22b of the support section 22); define the diameter of the first circumferential support member 23 as D1, the diameter of the second circumferential support member 24 as D2, and the diameter of the third circumferential support member 25 as D3, where D1, D2, and D3 satisfy: D1≤D3<D2, so as to facilitate the adjustment section 21 to turn towards the inner cavity of the main stent 10 and drive the adjustment section 21 to sink, and it is also convenient for the sunken support section 22 to swing freely in the circumferential direction of the branch stent 20 relative to the first circumferential support member 23. Among them, the setting of the first circumferential support member 23 has a circumferential supporting force between the adjustment section 21 and the support section 22. On the one hand, the first circumferential support member 23 is equivalent to presetting a crease between the adjustment section 21 and the support section 22, so that when the branch stent 20 is stressed, when the adjustment section 21 turns towards the direction close to the main stent 10, the relative folding between the adjustment section 21 and the support section 22 is more straightforward, and it prevents the connection membrane 211 from stacking, making the folding position on the side of the adjustment section 21 close to the support section 22 controllable; the adjustment section 21 folds towards the direction close to the main stent 10 with the first end 20a as the fulcrum, so that the end of the adjustment section 21 close to the support section 22 sinks, thereby driving the support section 22 to sink. At the same time, in terms of relative position, the adjustment section 21 folds towards the support section 22 relative to their connection (the first circumferential support member 23); on the other hand, the first circumferential support member 23 can better maintain the annular shape of its proximal end 22a during the process of driving the support section 22 to sink, preventing the annular shape of the proximal end of the support section from being affected due to the lack of wave rings in the adjustment section, which is beneficial to the reconstruction of the branch guide wire.The second circumferential support member 24 and the third circumferential support member 25 also each increase the support for the first end 20a and the second end 20b of the branch bracket 20. In other embodiments, any one of the first circumferential support member 23, the second circumferential support member 24, and the third circumferential support member 25 can be a continuous annular shape or a plurality of arcs arranged at intervals, and they can all be sewn and wrapped in the film to support the film opening into a ring shape.

[0056] The first circumferential support member 23, the second circumferential support member 24, and the third circumferential support member 25 can also be provided with imaging materials such as tantalum wire, which is more conducive to the lower turning adjustment section 21 and the sunken support section 22 forming a branch bracket 20 to provide good imaging performance in the body and facilitate the super-selective reconstruction of branches. In this embodiment, when the first circumferential support member 23 and the third circumferential support member 25 are provided, the support wave rings 222 can respectively abut against the circumferential support members on the same side at both ends of the branch bracket 20 in the axial direction to better maintain the stent shape of the support section 22, such as Figure 7 shown.

[0057] In this embodiment, as Figure 2 combined with Figure 7 shown, the support section 22 is a tubular structure with an equal diameter, that is, D1 = D3; the adjustment section 21 is a hollow frustum-like shape, that is, D1 < D2, and the projections of the first circumferential support member 23 and the third circumferential support member 25 on the radial cross-section of the branch bracket 20 do not exceed the projection of the second circumferential support member 24 on the radial cross-section of the branch bracket 20, which is convenient for the adjustment section 21 to turn towards the inner cavity of the main stent 10 without obstruction, thus smoothly driving the adjustment section 21 to sink, and it is also convenient for the sunken support section 22 to swing freely in the circumferential direction of the branch bracket 20 relative to the first circumferential support member 23. Further, D1 and D2 also satisfy: 1.5D1 ≤ D2 ≤ 3D1. When the size difference at both ends of the adjustment section 21 is too small, it may cause the adjustment section 21 to be not conducive to the adjustment section 21 turning towards the inner cavity of the main stent 10 relative to the first end 20a of the branch bracket 20. When the size difference at both ends of the adjustment section 21 is too large, it is not convenient for the shape setting of the adjustment section 21. When D1 and D2 satisfy 1.5D1 ≤ D2 ≤ 3D1, it is more conducive to the shape setting of the adjustment section 21 and when the branch bracket 20 is stressed, the adjustment section 21 turns towards the inner cavity of the main stent 10.

[0058] In this embodiment, four reinforcing ribs 212 are evenly arranged along the circumference of the branch bracket 20, such as Figure 3As shown, the central angle spanned between two adjacent reinforcing ribs 212 is 90°, which enables the sunken support section 22 to freely swing within a range of 360° around the axis of the branch bracket 20 (along the circumferential direction of the branch bracket 20) with its proximal end 22a as the base; in other embodiments, 1 to 16 reinforcing ribs 212 can be provided. When at least two reinforcing ribs 212 are provided, the reinforcing ribs 212 are arranged at intervals along the circumferential direction of the branch bracket 20 and are evenly spaced, so that the reinforcing ribs 212 of the branch bracket 20 are evenly distributed in the circumferential direction.

[0059] In this embodiment, the reinforcing rib 212 is a flexible reinforcing rib 212. On the one hand, it can ensure that the branch bracket 20 sinks even when a relatively small force is applied to the second end 20b of the branch bracket 20. On the other hand, when the support section 22 sinks and then is subjected to a lateral force and the support section 22 tilts towards one side, part of the reinforcing rib 212 on the stressed side needs to return to the non-flipped state to support its "tilted" shape, as Figure 5-6 Combined with Figure 1, so the flexible reinforcing rib 212 can make the support section 22 tilt and swing towards any direction in the circumferential direction, and the swinging process is more flexible, that is, the shape, supportability or softness of the reinforcing rib 212 affects whether the swinging process of the support section 22 is smooth and flexible.

[0060] The reinforcing rib 212 can be in a "chain-type" break point structure or broken section structure. In one embodiment, a suture line is sewn on the connecting membrane 211 in the direction from the first end 20a to the second end 20b, as Figure 7-8 shown. This suture line forms one of the reinforcing ribs 212. Generally, similar broken section or break point structures are formed on each side of the suture when sewing; on the other hand, since the suture line is relatively soft, when using the suture line for sewing, even if the suture line is continuously sewn or sewn back and forth for a few turns, it still has a certain flexibility; in other embodiments, the connecting membrane 211 includes a folding portion 2111, and the folding portion 2111 is heat-pressed together to form a ridge-shaped reinforcing rib 212. The folding portion 2111 can also be directly heat-pressed on the adjacent surface of the connecting membrane 211; it is also possible to form the folding portion 2111 not in the direction of heat-pressing, but by sewing the suture line and the folding portion 2111 together to form a ridge-shaped reinforcing rib 212, as Figure 9-12 shown. Among them, when sewing, the suture line can be wound around the folding portion 2111 and the folding portion 2111 is sewn on the connecting membrane 211, as Figure 10 shown, or it can be sewn at the root of the folding portion 2111, and the thread is walked and wound around the folding portion 2111 so that the folding portion 2111 is placed in a ridge shape on the connecting membrane 211, as Figure 12As shown, the specific routing mode of the suture and whether it is continuous are not limited. It is only necessary to extend the reinforcing rib 212 along the direction of the first end 20a and the second end 20b on the connecting film 211 to form a ridge-like non-rigid and non-immovable reinforcing support. And the extension line where the formed ridge is located does not need to be in the same plane as the tubular central axis of the branch bracket, and only needs to extend along the direction of the first end and the second end. It can be a straight extension, a curved extension, or a spiral extension. As long as when the branch bracket is stressed, the reinforcing rib can rotate towards the main bracket relative to the first end, thereby driving the support section to sink.

[0061] In other embodiments, such as Figure 7 As shown, the side of the frustum-like shape of the adjustment section 21 can be arc-shaped transition, and the arc is recessed towards the inner side of the branch bracket 20, so that the reinforcing rib 212 extending on the connecting film 211 along the adjustment section 21 is also recessed towards the inner side of the branch bracket 20. Compared with the situation of protruding towards the outer side of the branch bracket 20, when the same external force is applied, when the reinforcing rib 212 makes an arc-shaped transition along the connecting film 211 and is recessed towards the inner side of the branch bracket 20, it is more conducive to the downward turning of the adjustment section 21.

[0062] In this embodiment, as Figure 8 As shown, one of the reinforcing ribs 212 is a whole structure similar to a break point or a broken section in its extending direction. This reinforcing rib 212 includes a first end portion 2121 and a second end portion 2122. The first end portion 2121 is close to the first end 20a of the branch bracket 20, and the second end portion 2122 is close to the second end 20b of the branch bracket 20. There is a gap d1 between the first end portion 2121 and the first end 20a of the branch bracket 20 and / or a gap d2 between the second end portion 2122 and the support section 22. d1 and d2 satisfy: 1mm ≤ d1 ≤ 3mm, 1mm ≤ d2 ≤ 3mm, so that the two ends of the reinforcing rib 212 do not extend to the two end edges of the adjustment section 21, leaving gaps beside the two end portions of the reinforcing rib 212. When the adjustment section 21 turns downward into the main cavity, the support section 22 sinks into the main cavity along with the adjustment section 21. The adjustment section 21 and the branch opening 11 cooperate to form a micro "cradle-like" structure. Both the gap d1 and the gap d2 help the support section 22 to slightly translate and swing within the range of the branch opening 11, and can also increase the flexibility and swing range when it swings freely.

[0063] Such as Figure 9As shown, a reinforcing rib 212 includes a first section 212a and a second section 212b along its extending direction, and a gap d3 is provided between the first section 212a and the second section 212b, so that a reinforcing rib 212 is divided into two spaced sections in its extending direction. In this embodiment, the section close to the main body bracket 10 is the first section 212a, and the section close to the support section 22 is the second section 212b, so that the adjustment section 21 can be partially turned down or completely turned down. When only the first section 212a is turned down and the second section 212b is folded relative to the first section 212a, as Figure 14 shown, on the one hand, at this time, the second section 212b still has the possibility of continuing to turn down, and the second section 212b can also be folded relative to the support section 22, as Figure 15 shown, and when only the first section 212a is turned down, the second section 212b provides a certain height for the support section 22, so that the turning down of the reinforcing rib 212 does not necessarily drive the support section 22 to sink into the cavity of the main body bracket 10. When the support section 22 is tilted relative to the second section 212b, a larger angle can be tilted, as Figure 16 shown; on the other hand, as Figure 17-17a and Figure 18-18a shown, the first section 212a and the branch port 11 cooperate to form a micro "cradle" structure, which can enable the support part to translate and swing in the circumferential direction of the branch bracket 20. Combining with the possibility of the second section 212b turning down, the flexibility of the branch bracket 20 swinging in all directions can be further increased.

[0064] The covered stent 100 provided by the present invention can be an aortic arch stent (such as Figure 19 shown), or a thoracoabdominal main stent (such as Figure 20 shown), or an abdominal main stent (such as Figure 21 shown), or in cases such as iliac bifurcation that require branches to be provided, the branch bracket 20 can be set to the above structure for aortic arch branches, thoracoabdominal main branches, abdominal main stents, and iliac bifurcations to provide a branch bracket 20 that can swing flexibly, facilitating branch alignment. And because the adjustment section 21 turns down into the aortic cavity, driving the support section 22 to sink, and the support section 22 can swing flexibly in the circumferential direction of the branch bracket 20, so when the covered stent 100 is implanted, it only needs the branch blood vessel opening to be within the range of the branch port 11 of the main body bracket 10. Therefore, the alignment accuracy between the branch bracket 20 and the branch blood vessel opening does not need to be strictly required; the opening orientation (tilt angle) of the second end 20b of the branch bracket 20 and the extending length of the branch bracket 20 can be flexibly adjusted according to the angle of the morphology of the branch artery to be reconstructed. Especially for patients with dissecting aneurysm, in the case of a narrow true lumen, the branch bracket 20 can sink into the main body bracket 10, or even be flush with the side of the main body bracket 10, which can avoid the situation of squeezing the branch bracket due to the narrow space of the aortic true lumen, thereby affecting the components of the branch guide wire and the branch blood flow.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] The above-described embodiments only express several implementation manners of the present invention, and the description is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A covered stent, characterized in that, The covered stent includes a main stent and a branch stent. The main stent includes a branch opening communicating with the branch stent. The branch stent includes an opposite first end and a second end. The first end is connected to the branch opening. The branch stent includes an adjustment section near the first end and a support section near the second end. The adjustment section includes a reinforcing rib so that when the branch stent is stressed, it can drive the support section to sink.

2. The covered stent according to claim 1, wherein, The adjustment section further includes a connecting film connecting the branch opening and the support section. The reinforcing rib is arranged on the connecting film, and the reinforcing rib is a flexible reinforcing rib.

3. The covered stent according to claim 2, wherein The reinforcing rib has a "chain-type" broken point structure or broken section structure.

4. The covered stent according to claim 1, wherein The reinforcing rib includes a first section and a second section along its extending direction, and there is a gap between the first section and the second section.

5. The covered stent according to claim 2, characterized in that, The reinforcing rib includes a sewing thread sewn along the connecting film; Or, the connecting film includes a folding part, and the folding part is thermally pressed and adhered to form the reinforcing rib; Or, the connecting film includes a folding part, the reinforcing rib includes the folding part and a sewing thread, and the sewing thread is sewn into one body along the folding part to form the reinforcing rib.

6. The covered stent according to claim 1, characterized in that, At least two reinforcing ribs are arranged at intervals along the circumferential direction of the branch stent.

7. The covered stent according to claim 1, characterized in that, The branch stent includes a first circumferential support member arranged along the circumferential direction of the branch stent, and the first circumferential support member is arranged at the connection between the adjustment section and the support section.

8. The covered stent according to claim 7, characterized in that, The branch stent further includes a second circumferential support member and a third circumferential support member. The second circumferential support member is arranged at the first end, and the third circumferential support member is arranged at the second end.

9. The covered stent according to claim 8, characterized in that, Define the diameter of the first circumferential support member as D1, the diameter of the second circumferential support member as D2, and the diameter of the third circumferential support member as D3. D1, D2, and D3 satisfy: D1 ≤ D3 < D2; Or, D1, D2, and D3 satisfy: D1 ≤ D3, and 1.5D1 ≤ D2 ≤ 3D1.

10. The covered stent according to any one of claims 1-9, characterized in that, The reinforcing rib includes a first end and a second end. The first end is close to the first end, and the second end is close to the second end. There is a gap between the first end and the first end of the branch stent and / or there is a gap between the second end and the adjustment section.

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