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, the branch support comprises a first circumferential supporting piece arranged in the circumferential direction of the branch support, and the first circumferential supporting piece is arranged at the joint of the adjusting section and the supporting section. According to the covered stent, the first circumferential supporting piece is arranged at the joint of the adjusting section and the supporting section of the branch stent, so that supporting force is conveniently provided between the adjusting section and the supporting section, a covering film at the near end of the supporting section is pulled, and the annular shape of the near end of the supporting section is better kept.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a coated stent. Background Art

[0002] Branch stent reconstruction technology has become one of the mainstream technologies for intracavitary branch reconstruction. However, the current branch stent reconstruction technology has the following two major difficulties. First, the positioning accuracy of the stent with branches is high. Second, although the positioning accuracy requirement of the stent with internal branches can be reduced when the external branch stent is connected, the internal branch stent occupies the main cavity space and affects the hemodynamics of the main cavity. Utility Model Content

[0003] A technical problem solved by the utility model is how to provide a coated stent to solve the problem that when a branch stent is subjected to force, the stent morphology of the proximal end of the supporting section is affected due to the lack of support in the adjusting section.

[0004] The utility model provides a coated stent, which comprises a main stent and a branch stent, the main stent comprising a branch port connected to the branch stent, the branch stent comprising a first end and a second end opposite to each other, the first end being connected to the branch port, the branch stent comprising an adjustment section close to the first end and a support section close to the second end, the branch stent comprising a first circumferential support member arranged along the circumference of the branch stent, the first circumferential support member being arranged at the connection between the adjustment section and the support section.

[0005] In one embodiment, the branch support further includes a second circumferential support member and a third circumferential support member, wherein the second circumferential support member is disposed at the first end, and the third circumferential support member is disposed at the second end.

[0006] In one embodiment, the diameter of the first circumferential support member is defined as D1, the diameter of the second circumferential support member is defined as D2, and the diameter of the third circumferential support member is defined as D3, and D1, D2 and D3 satisfy: D1≤D3<D2;

[0007] Or, D1, D2 and D3 satisfy: D1≤D3, and 1.5D1≤D2≤3D1.

[0008] In one embodiment, the first circumferential support member includes a suture extending along the circumferential direction.

[0009] In one of the embodiments, the adjustment section further includes a connecting membrane connecting the branch port and the supporting section, and the adjustment section includes reinforcing ribs arranged on the connecting membrane so that the supporting section can be driven to sink when the branch bracket is subjected to force.

[0010] In one embodiment, the reinforcing ribs are flexible reinforcing ribs, and the reinforcing ribs have a "chain-like" breakpoint structure or a broken section structure.

[0011] In one embodiment, the reinforcing rib includes a first section and a second section along its extension direction, and a gap is provided between the first section and the second section.

[0012] In one embodiment, the reinforcing rib comprises a suture line sewn along the connecting membrane;

[0013] Or, the connecting film includes a folded portion, and the folded portion is hot-pressed to form the reinforcing rib;

[0014] Alternatively, the connecting film includes a folded portion, the reinforcing rib includes the folded portion and a suture line, and the suture line is sutured along the folded portion to form the reinforcing rib.

[0015] In one embodiment, at least two reinforcing ribs are arranged at intervals along the circumference of the branch support.

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

[0017] A technical effect of an embodiment of the utility model is: the utility model sets a first circumferential support member at the connection between the adjustment section and the support section of the branch stent to provide a supporting force between the adjustment section and the support section, pull the coating at the proximal end of the support section to better maintain the annular shape of the proximal end of the support section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a stent graft provided by the utility model;

[0019] Figure 2 A schematic diagram of the structure of a branch bracket provided by the utility model;

[0020] Figure 3 for Figure 2 A top view of

[0021] Figure 4 A schematic diagram of the structure of another branch bracket provided by the utility model;

[0022] Figure 5 for Figure 1 The branch stents of the provided stent grafts are Figure 1 Schematic diagram of the branch stent sinking into the main stent cavity after the force shown in F1;

[0023] Figure 6 for Figure 1 The branch stents of the provided stent grafts are Figure 1 Schematic diagram of the branch stent sinking into the main stent cavity after the force shown in F2 in the middle;

[0024] Figure 7 A schematic diagram of the structure of another branch bracket provided by the utility model;

[0025] Figure 8 for Figure 7 The enlarged view of point A in the middle;

[0026] Fig. 9 for Figure 7 An enlarged view of another embodiment at A in the middle;

[0027] Fig.10 for Fig. 9 A top view of

[0028] Fig.11 for Figure 7 A is an enlarged view of another embodiment;

[0029] Fig.12 for Fig.11 A top view of

[0030] Fig.13 A top view of a branch bracket provided by the utility model (looking from the second end of the branch bracket to the first end);

[0031] Fig.14 for Fig.13 A schematic diagram of the first section of the provided branch support when it is turned down;

[0032] Fig.15 For Fig.14 The second paragraph of the diagram also turns down based on the above;

[0033] Fig.16 For Fig.14 A schematic diagram of the support section of the foundation being tilted relative to the second section;

[0034] Fig.17 For Fig.14 A schematic diagram of a micro "cradle-like" structure based on the left side of the figure swaying in translation;

[0035] Fig.17a for Fig.17 A top view schematic diagram of the middle branch support;

[0036] Fig.18 For Fig.14 A schematic diagram of a micro "cradle-like" structure based on the base moving horizontally and swinging toward the right side of the figure;

[0037] Fig.18a for Fig.18 A top view schematic diagram of the middle branch support;

[0038] Fig.19 A schematic diagram of the structure of an aortic arch stent provided by the utility model;

[0039] Fig. 20 This is a schematic diagram of the structure of a chest and abdomen main support provided by the utility model;

[0040] Fig.21 The present invention is a schematic structural diagram of an abdominal main support provided by the present invention.

[0041] 100, stent graft; 10, main stent; 11, branch port; 12, first bare wave ring; 13, main wave ring; 14, main body coating; 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; 2122, second end; 22, supporting section; 22a, proximal end; 22b, distal end; 221, supporting coating; 222, supporting wave ring;

[0042] 23. First circumferential support member; 24. Second circumferential support member; 25. Third circumferential support member; DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method. The axial direction of the branch stent defined in the present utility model 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 utility model provides a stent graft 100, such as Figure 1As shown, the coated 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, including a first bare wave coil 12, a main wave coil 13 and a main coating 14, wherein the main wave coil 13 includes a plurality of main wave coils 13, which are arranged along the axial direction of the main stent 10 and connected by the tubular main coating 14. The number of the main wave coils 13 can be reasonably set according to the axial length of the main stent 10 and the wave height of the wave coil, and avoid the branch opening 11, so as to facilitate the connection of the branch stent 20 at 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 support 10 can be set to: 40mm~240mm, the first bare wave circle 12 is arranged on the proximal end side of the main wave circle 13, and is connected to the proximal edge of the main coating 14; in other embodiments, the first bare wave circle 12 may not be set. In this case, the proximal end of the coating is the proximal end of the main support 10.

[0047] In this embodiment, the main body wave coil 13 is arranged on the outside of the main body coating 14. When implanted in a blood vessel, the friction between the main body stent 10 and the inner wall of the blood vessel can be enhanced, which is helpful to prevent the main body stent 10 from shifting or shortening relative to the inner wall of the blood vessel. In other embodiments, the main body wave coil 13 can also be arranged on the inside of the main body coating 14, or the main body wave coil 13 can be partially arranged on the inside of the main body coating 14 and partially arranged on the outside of the main body coating 14, which is not limited here.

[0048] like Figure 1-2 As shown, the branch stent 20 includes a first end 20a and a second end 20b relative to each other, and the first end 20a can be sutured and connected to the branch port 11 of the main stent 10 along its circumference by means of sutures, and the branch stent 20 also 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, wherein the support section 22 includes a support coating 221 and a support wave ring 222, the support coating 221 is covered on the inner side or the outer side of the support wave ring 222, the edge of the support wave ring 222 close to the first section 212a is flush or nearly flush with the edge of the support coating 221 on the same side, and the edge of the support wave ring 222 close to the second end 20b is flush or nearly flush with the edge of the support coating 221 on the same side, wherein nearly flush means that the edge misalignment does not exceed 1 mm, so that the support wave ring 222 has a better support effect on the edge of the support section 22.

[0049] like Figure 2-3As shown, the adjustment section 21 includes a connecting film 211 and a reinforcing rib 212 provided on the connecting film 211. In this embodiment, the adjustment section 21 is connected to the supporting section 22, and the connecting film 211 connects the branch port 11 and the supporting section 22, wherein the supporting coating 221 is connected to the connecting film 211 to form the branch coating of the branch stent 20, and the supporting wave ring 222 includes at least one corrugated ring, which extends in a corrugated manner along the circumference of the tubular supporting coating 221 (i.e., the circumference of the branch stent 20) to support the supporting coating 221 and maintain the lumen of the branch stent 20. In this embodiment, the length range of the branch stent 20 along its axial direction is: 5mm~40mm, wherein the length range of the adjustment section 21 in the axial direction of the branch stent 20 is: 3mm~20mm; the length range of the supporting section 22 in the axial direction of the branch stent 20 is: 2mm~20mm.

[0050] In this embodiment, the reinforcing rib 212 extends on the connecting membrane 211 from the first end 20a toward the second end 20b, or the reinforcing rib 212 extends from the second end 20b toward the first end 20a. The extension direction here only indicates the extension direction of the length of the reinforcing rib 212 and does not indicate the starting and ending directions of the reinforcing rib 212 when extending, so that when the second end 20b of the branch stent 20 or the side of the branch stent 20 is subjected to force, the reinforcing rib 212 provides support to the connecting membrane 211, so that the reinforcing rib 212 rotates relative to the first end 20a, thereby driving the support section 22 to at least partially sink to the adjustment section 21, and at the same time prevents the connecting membrane 211 from being stacked in the axial direction due to the connecting membrane 211 being too soft to provide support along the axial direction of the branch stent 20. If the connecting membrane 211 of the adjusting section 21 is stacked in the axial direction of the branch stent 20, when constructing the branch guidewire, the stacked connecting membrane 211 will easily make it difficult for the branch guidewire to move forward.

[0051] In other embodiments, the parts of the reinforcing rib other than the two ends connected to the connecting membrane may also be suspended from the connecting membrane, and can also serve as the reinforcing rib to support the connecting membrane in the axial direction of the branch bracket to facilitate the rotation of the reinforcing rib relative to the first end, which is not limited here.

[0052] like Figure 2-3 As shown, the support segment 22 can be a tubular structure of equal diameter, and the support segment 22 includes a distal end portion 22b away from the main stent 10 and a proximal end portion 22a close to the main stent 10, wherein the distal end portion 22b and the proximal end portion 22a are concentric and equal in diameter so that the support segment 22 forms a tubular cavity of equal diameter. In other embodiments, the support segment 22 can also be a tubular structure of non-equal diameter; when the support segment 22 is a tubular structure of non-equal diameter, the annular opening diameter of the proximal end portion 22a of the support segment 22 is less than or equal to the annular opening diameter of the distal end portion 22b of the support segment 22 (i.e., the end portion of the second end 20b of the branch stent 20), as shown in FIG. Figure 4As shown, the support section 22 can be an inverted frustum-shaped structure with a diameter gradually increasing from the proximal end 22a toward the distal end 22b, and the axial angle α between the side of the support section 22 and the branch bracket 20 is less than or equal to the axial angle β between the side of the adjustment section 21 and the branch bracket 20, so that after the support section 22 sinks into the downward-turned adjustment section 21, there is still excess space in the downward-turned adjustment section 21 for the support section 22 to tilt circumferentially and swing flexibly; the support section 22 can also be a drum-shaped structure with a large diameter in the middle and small diameters at both ends, which makes it easier for the support section 22 to sink relative to the adjustment section 21 and facilitates the support section 22 to flexibly rotate along the circumference of the branch bracket 20.

[0053] like Figure 2-3 and Figure 5 Combination Figure 1 As shown, when the second end 20b of the branch bracket 20 is Figure 1 When the force is from top to bottom, the direction of the force is Figure 1 As shown by the arrow F1 in FIG. 1 , the reinforcing rib 212 of the adjusting section 21 rotates relative to the first end 20a, so that the adjusting section 21 rotates from the outside of the main support 10 toward the inside of the main support 10, thereby driving the supporting section 22 to sink into the cavity of the main support 10 as a whole, as shown in FIG. Figure 5 As shown, since the sunken support segment 22 can swing flexibly, when the branch guide wire passes through the sunken support segment 22, according to the direction of the branch guide wire, the support segment 22 can be pulled by the branch guide wire so that the support segment 22 tilts toward the branch blood vessel opening. In this embodiment, the adjustment segment 21 and the support segment 22 can be set to have the same height in the axial direction of the branch stent 20. When the adjustment segment 21 turns inward toward the cavity of the main stent 10 and drives the support segment 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 FIG. Figure 5 In other embodiments, the height of the adjustment segment 21 in the axial direction of the branch stent 20 can be set to be greater than the height of the support segment 22 in the axial direction of the branch stent 20, so that the branch stent 20 sinks into the cavity of the main stent 10, which can avoid squeezing the branch stent 20 due to the narrow space of the aortic true cavity.

[0054] like Figure 6 Combination Figure 1 As shown, when the branch support 20 is subjected to lateral force, as shown in Figure 1 As shown in the direction of arrow F2 in FIG. 1 , the reinforcing rib 212 on the opposite side of the force point rotates relative to the corresponding position of the first end 20a, so that the opposite side of the force point ( Figure 1 The adjusting section 21 on the right side of the branch bracket 20 drives the supporting section 22 on this side to sink, so that the adjusting section 21 moves toward its force point ( Figure 1 The opposite side (right side) of the left side of the branch support 20 is inclined, such as Figure 6As shown. Since the adjusting section 21 has no circumferential corrugated support, when the second end 20b or the side of the branch stent 20 is stressed, the adjusting section 21 cannot be pressed down because the lumen of the adjusting section 21 is a fixed tube. The reinforcing rib 212 is extended in this direction. Combined with the flexibility of the connecting membrane 211, the adjusting section 21 can be at least partially folded into the lumen of the main stent 10 due to stress, so as to adjust the direction of the port of the second end 20b of the branch stent 20, or the supporting section 22 can be sunken along the axial direction of the branch stent 20 to be close to the main stent 10 or even be completely sunken into the lumen of the main stent 10. Since the supporting section 22 has its own support, it is close to the lumen of the main stent 10 only in position while maintaining its original shape.

[0055] like Figure 7As shown, the branch bracket 20 includes a first circumferential support member 23 arranged along the circumference of the branch bracket 20, and the first circumferential support member 23 is arranged at the connection between the adjustment section 21 and the support section 22. In the present embodiment, the first circumferential support member 23 can be formed by suturing along the circumference of the connection using sutures, and the support coating 221 and the connecting membrane 211 can be two separate membranes sewed together using sutures, or they can be an integral membrane, and then they are sutured along the circumference at the boundary between the two using sutures. The first circumferential support member 23 can be continuous sutures along the circumference, or it can be intermittent sutures, which are not limited here, and it is only necessary to form a circumferential suture with support other than the membrane at the 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 it can be a continuous developing ring, and then the developing arc or the developing ring is sutured at the connection with sutures to provide support other than the membrane at the connection, and when the circumferential support member is a discontinuous arc, its diameter is the diameter of the circle corresponding to the arc. The branch bracket 20 also includes a second circumferential support member 24 and a third circumferential support member 25, the second circumferential support member 24 is arranged at the first end 20a of the branch bracket 20 (that is, the end of the adjustment section 21 away from the support section 22), and the third circumferential support member 25 is arranged at the second end 20b of the branch bracket 20 (that is, the end of the support section 22 away from the adjustment section 21, that is, the distal end 22b of the support section 22); the diameter of the first circumferential support member 23 is defined as D1, the diameter of the second circumferential support member 24 is D2, and the diameter of the third circumferential support member 25 is D3, wherein D1, D2 and D3 satisfy: D1≤D3<D2, so that the adjustment section 21 can turn toward the inner cavity of the main bracket 10, thereby driving the adjustment section 21 to sink, and also facilitate the sinking support section 22 to swing freely in the circumferential direction of the branch bracket 20 relative to the first circumferential support member 23. Among them, the setting of the first circumferential support member 23 provides a circumferential support 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 fold between the adjustment section 21 and the support section 22, so that when the branch support 20 is subjected to force, when the adjustment section 21 flips toward the direction close to the main support 10, the relative folding between the adjustment section 21 and the support section 22 is more crisp, and the connection film 211 is prevented from stacking, so that the folding position of the adjustment section 21 close to the support section 22 is controllable; the adjustment section 21 takes the first end 20a as the fulcrum toward The adjusting section 21 is folded in the direction close to the main support 10, so that the end of the adjusting section 21 close to the supporting section 22 sinks, thereby driving the supporting section 22 to sink. At the same time, in terms of relative position, the adjusting section 21 is folded toward the supporting section 22 relative to the connection between the two (the first circumferential support member 23). On the other hand, the first circumferential support member 23 can better maintain the annular shape of the proximal end portion 22a of the supporting section in the process of driving the supporting section 22 to sink, thereby preventing the annular shape of the proximal end portion of the supporting section from being affected by the lack of wave ring support in the adjusting section, thereby facilitating the reconstruction of the branch guidewire.The second circumferential support member 24 and the third circumferential support member 25 also respectively increase the support of the first end 20a and the second end 20b of the branch stent 20. In other embodiments, any circumferential support member of the first circumferential support member 23, the second circumferential support member 24 and the third circumferential support member 25 can be a continuous ring or a plurality of arc-shaped intervals, and can be sutured and wrapped in the coating with sutures to support the coating opening in 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 set as a developing material, such as tantalum wire, etc., which is more conducive to the downward-turned adjustment section 21 and the sunken support section 22 to form a branch stent 20 to provide good developing properties in the body, which is convenient for super-selective reconstruction of branches. In this embodiment, when the first circumferential support member 23 and the third circumferential support member 25 are set, the two ends of the support wave ring 222 in the axial direction of the branch stent 20 can respectively abut against the circumferential support members on the same side thereof to better maintain the stent shape of the support section 22, such as Figure 7 shown.

[0057] In this embodiment, if Figure 2 Combination Figure 7 As shown, the support section 22 is a tubular structure of equal diameter, i.e., D1=D3; the adjustment section 21 is a hollow frustum-like shape, i.e., D1<D2, and the projections of the first circumferential support member 23 and the third circumferential support member 25 on the radial section of the branch bracket 20 do not exceed the projection of the second circumferential support member 24 on the radial section of the branch bracket 20, so that the adjustment section 21 is not obstructed when turning toward the inner cavity of the main bracket 10, thereby smoothly driving the adjustment section 21 to sink, and also facilitating the sinking support section 22 to swing freely in the circumferential direction of the branch bracket 20 relative to the first circumferential support member 23. Furthermore, 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 first end 20a of the adjustment section 21 relative to the branch bracket 20 to be turned inward toward the cavity of the main bracket 10. 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 subjected to force, the adjustment section 21 is turned inward toward the cavity of the main bracket 10.

[0058] In this embodiment, four reinforcing ribs 212 are evenly arranged along the circumference of the branch bracket 20. Figure 3As shown, the central angle between two adjacent reinforcing ribs 212 is 90°, which allows the sunken support segment 22 to swing freely within a range of 360° around the axial direction of the branch bracket 20 (along the circumference of the branch bracket 20) with its proximal end portion 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 spaced apart along the circumference 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 can sink when the second end 20b of the branch bracket 20 is subjected to a small force. On the other hand, when the support section 22 sinks and is then subjected to a lateral force, when the support section 22 tilts toward one side, the reinforcing rib 212 on the force-bearing side needs to partially return to the unturned state to support its "tilted" shape, such as Figure 5-6 As shown in combination with 1, the flexible reinforcing ribs 212 can make the swinging process of the supporting section 22 more flexible when it tilts and swings in any circumferential direction, that is, the shape, support or softness of the reinforcing ribs 212 affects whether the swinging process of the supporting section 22 is smooth and flexible.

[0060] The reinforcing rib 212 may be a "chain-like" breakpoint structure or a broken section structure. In one embodiment, a suture line is sutured on the connecting film 211 from the first end 20a toward the second end 20b, such as Figure 7-8 As shown, the suture forms one of the reinforcing ribs 212. When the suture is sutured, similar broken sections or breakpoint structures are generally formed on either side of the suture. On the other hand, since the suture is relatively soft, when the suture is used for suture, even if the suture is sutured continuously or sutured back and forth for a few circles, it still has a certain flexibility. In other embodiments, the connecting film 211 includes a folding portion 2111, and the folding portion 2111 is formed into a ridge-shaped reinforcing rib 212 by hot pressing the folding portion 2111 together. The folding portion 2111 can also be directly hot pressed on the adjacent connecting film 211 surface. The folding portion 2111 can also be formed not in the direction of hot pressing, but by sewing the suture and the folding portion 2111 into one piece by means of stitches to form a ridge-shaped reinforcing rib 212, as shown in FIG. Figure 9-12 When suturing, the suture thread can be passed around the folded portion 2111, and the folded portion 2111 can be sewed onto the connecting film 211, as shown in FIG. Fig.10 As shown, it is also possible to sew at the root of the folded portion 2111, and route and bypass the folded portion 2111 so that the folded portion 2111 is placed on the connecting film 211 in a ridge shape, as shown in FIG. Fig.12As shown, there is no limitation on the specific routing of the suture line and whether it is continuous. The reinforcing rib 212 only needs to be extended along the direction of the first end 20a and the second end 20b on the connecting membrane 211 to form a ridge-like non-rigid, non-rotatable reinforcing support; and the extension line of the formed ridge does not need to be on the same plane as the tubular center axis of the branch bracket, it only needs to be extended along the direction of the first end and the second end, it can be a straight line extension, a curve extension, or a spiral extension, as long as it can be achieved that when the branch bracket is subjected to force, the reinforcing rib rotates relative to the first end toward the direction of the main bracket, thereby driving the support section to sink.

[0061] In other embodiments, Figure 7 As shown, the truncated cone-shaped side of the adjustment section 21 can be an arc-shaped transition, and the arc is recessed toward the inner side of the branch bracket 20, so that the reinforcing rib 212 extending along the connecting membrane 211 of the adjustment section 21 is also recessed toward the inner side of the branch bracket 20. Compared with the situation of protruding toward the outer side of the branch bracket 20, when subjected to the same external force, the reinforcing rib 212 transitions in an arc shape along the connecting membrane 211 and is recessed toward the inner side of the branch bracket 20, which is more conducive to the downward flipping of the adjustment section 21.

[0062] In this embodiment, if Figure 8 As shown, one of the reinforcing ribs 212 is a whole structure similar to a breakpoint or a broken section in its extension direction. The reinforcing rib 212 includes a first end 2121 and a second end 2122. The first end 2121 is close to the first end 20a of the branch bracket 20, and the second end 2122 is close to the second end 20b of the branch bracket 20. A gap d1 is provided between the first end 2121 and the first end 20a of the branch bracket 20, and / or a gap d2 is provided between the second end 2122 and the support section 22. d1 and d2 satisfy: 1m m≤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 adjusting section 21, and a gap is left beside the two ends of the reinforcing rib 212. When the adjusting section 21 is flipped down into the main cavity, the supporting section 22 sinks into the main cavity along with the adjusting section 21, and the adjusting section 21 cooperates with the branch opening 11 to form a micro "cradle-like" structure. The gap d1 and the gap d2 both help the supporting section 22 to slightly translate and shake within the range of the branch opening 11, and can also increase its flexibility and swing range when it swings freely.

[0063] like Fig. 9As shown, a reinforcing rib 212 includes a first section 212a and a second section 212b along its extension 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 interval sections in its extension direction. In this embodiment, a section close to the main support 10 is the first section 212a, and a section close to the supporting section 22 is the second section 212b, so that the adjustment section 21 can be partially or completely turned down. When only the first section 212a is turned down, the second section 212b is folded relative to the first section 212a, as shown in FIG. Fig.14 As shown, 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 supporting section 22, such as Fig.15 As shown, 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 support 10. When the support section 22 is tilted relative to the second section 212b, it can be tilted at a larger angle, such as Fig.16 On the other hand, as shown Figure 17-17a as well as Figure 18-18a As shown, the first section 212a cooperates with the branch opening 11 to form a micro "cradle-like" structure, which allows the support part to translate and swing in the circumferential direction of the branch bracket 20. Combined with the second section 212b having the possibility of flipping down, the flexibility of the branch bracket 20 to swing in all directions can be further increased.

[0064] The stent graft 100 provided by the utility model can be an aortic arch stent (such as Fig.19 As shown), it can also be a chest and abdomen main support (as shown Fig. 20 as shown), or abdominal main support (as shown Fig.21 As shown in the figure), or in the case where branches are required, such as the iliac bifurcation, the branch stent 20 can be configured as the above-mentioned structure, so as to be used for the aortic arch branch, the thoracic and abdominal main branch, the abdominal main stent and the iliac bifurcation, so as to provide a branch stent 20 that can be flexibly swung, which is convenient for branch alignment, and because the adjustment section 21 is turned down into the aortic cavity, the support section 22 is driven to sink, and the support section 22 can be flexibly swung relative to the circumference of the branch stent 20, so when the covered stent 100 is implanted, it is only necessary that the branch blood vessel opening corresponds to the branch opening 11 of the main stent 10. Therefore, the alignment accuracy between the branch stent 20 and the branch blood vessel opening is not strictly required; the opening direction (tilt angle) of the second end 20b of the branch stent 20 and the extension length of the branch stent 20 can also be flexibly adjusted according to the angle of the branch artery morphology to be reconstructed. In particular, for patients with dissecting aneurysms, when the true lumen is narrow, the branch stent 20 can be sunk into the main stent 10, or even flush with the side of the main stent 10, to avoid squeezing the branch stent due to the narrow true lumen space of the aorta, thereby affecting the components of the branch guidewire and the branch blood flow.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0066] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A stent graft, characterized in that: The coated stent includes a main stent and a branch stent, the main stent includes a branch port connected to the branch stent, the branch stent includes a first end and a second end opposite to each other, the first end is connected to the branch port, the branch stent includes an adjustment section close to the first end and a support section close to the second end, the branch stent includes a first circumferential support member arranged along the circumference of the branch stent, and the first circumferential support member is arranged at the connection between the adjustment section and the support section.

2. The stent graft according to claim 1, characterized in that: The branch support further includes a second circumferential support member and a third circumferential support member, wherein the second circumferential support member is disposed at the first end, and the third circumferential support member is disposed at the second end.

3. The stent graft according to claim 2, characterized in that: The diameter of the first circumferential support member is defined as D1, the diameter of the second circumferential support member is defined as D2, and the diameter of the third circumferential support member is defined as D3, and D1, D2 and D3 satisfy: D1≤D3<D2; Or, D1, D2 and D3 satisfy: D1≤D3, and 1.5D1≤D2≤3D1.

4. The stent graft according to claim 1, characterized in that: The first circumferential support comprises a suture extending in a circumferential direction.

5. The stent graft according to claim 1, characterized in that: The adjusting section also includes a connecting membrane connecting the branch opening and the supporting section, and the adjusting section includes reinforcing ribs arranged on the connecting membrane so that the supporting section can be driven to sink when the branch bracket is subjected to force.

6. The stent graft according to claim 5, characterized in that: The reinforcing ribs are flexible reinforcing ribs, and the reinforcing ribs have a "chain-like" breakpoint structure or a broken section structure.

7. The stent graft according to claim 5, characterized in that: 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.

8. The stent graft according to claim 5, characterized in that: The reinforcing ribs include sutures sewn along the connecting membrane; Or, the connecting film includes a folded portion, and the folded portion is hot-pressed to form the reinforcing rib; Alternatively, the connecting film includes a folded portion, the reinforcing rib includes the folded portion and a suture line, and the suture line is sutured along the folded portion to form the reinforcing rib.

9. The stent graft according to claim 5, characterized in that: At least two reinforcing ribs are arranged at intervals along the circumference of the branch support.

10. The stent graft according to any one of claims 5 to 9, characterized in that: The reinforcing rib includes a first end and a second end, the first end is close to the first end, the second end is close to the second end, a gap is provided between the first end and the first end of the branch bracket and / or a gap is provided between the second end and the adjustment section.

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