Luminal stent

Abstract

The present invention provides a luminal stent, comprising: a main stent, a branch stent, and a connector. The main stent is a tubular structure with openings at both ends. The branch stent is disposed within the lumen of the main stent, and at least a portion of the branch stent is movable relative to the main stent. The connector is elastic and disposed between the inner surface of the main stent and the inner surface of the branch stent to limit the range of motion of the branch stent. The luminal stent of the present invention can effectively establish a channel for the implantation of a bridging stent, facilitating implantation of the bridging stent, while preventing the occurrence of bridging stent blockage caused by displacement of the main stent, ensuring that the implanted bridging stent does not affect blood circulation in the branch blood vessels, and ensuring the safety and reliability of the luminal stent.

Description

Technical Field

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

[0002] Aortic aneurysm and aortic dissection are diseases that currently pose a serious threat to human life. If not actively treated, the aortic aneurysm and dissection will continue to grow and eventually rupture, causing serious complications and death. With the increasing number of patients with hypertension, hyperlipidemia and hyperglycemia, the incidence of aortic aneurysm and aortic dissection is also increasing significantly.

[0003] Traditional open surgical treatments for aortic aneurysms and aortic dissections are highly invasive, have high mortality rates, require long operative times, have high rates of postoperative complications, and are difficult to perform. Endovascular treatment, on the other hand, offers minimal invasiveness, fewer postoperative complications, shorter operative times, and lower surgical difficulty, and has gradually become the primary treatment for these conditions. By implanting a luminal stent in the aorta, the vascular lesions are isolated outside the stent, and blood flow is restricted to flow through the stent, thereby protecting the blood vessels. To ensure the fixation of the stent implant and prevent blood flow from flowing into the blood vessels through the proximal and distal ends of the stent, the stent requires an anchoring region of a certain length. Therefore, when an aortic aneurysm or dissection extends to a branching artery, implanting a luminal stent for treatment will result in varying degrees of occlusion of the branching artery, and may even render endovascular treatment impossible.

[0004] For endovascular treatment of aortic aneurysms or dissections that extend into branch arteries, window stents, chimney stents, and bridging stents are commonly used to restore blood flow to these branches. These stents have high postoperative endoleak rates, and until the branch arteries are reconstructed, the branch arteries remain ischemic, leading to a higher risk of postoperative complications.

[0005] Bridging stent technology has become a trending topic for treating aortic dissection or aortic aneurysm involving branch arteries due to its advantages, such as low postoperative endoleak, excellent stent integrity, and continuous blood supply to the branch arteries during implantation. Bridging stent technology can be categorized as branched stents and external bridging stents based on their relative position to the main stent. Branched stent technology, with its advantages of ease of assembly and relatively low surgical difficulty, has become a current research hotspot.

[0006] Existing branch stents are fixed inside the main stent. This fixation ensures that the bridge stent does not swing with the blood flow after implantation, reducing blood impact on the bridge stent and achieving good postoperative results. However, in cases where the bridge stent is connected to the branch stent at a narrow angle, implantation of the bridge stent is difficult and can easily cause displacement of the main stent. Furthermore, the bridge stent can be easily deformed by the main stent, leading to blockage. Summary of the Invention

[0007] The present invention aims to at least solve the problem of difficulty in the bridging stent implantation process. This aim is achieved by:

[0008] The present invention provides a luminal stent, comprising:

[0009] The main body support is a tubular structure with openings at both ends;

[0010] a branch stent, the branch stent being disposed in the lumen of the main stent, and at least a portion of the branch stent being movable relative to the main stent;

[0011] A connecting piece is provided between the inner surface of the main support and the inner surface of the branch support. The connecting piece is elastic and is used to limit the range of movement of the branch support.

[0012] In one embodiment, one end of the connecting member is connected to the main support, and the other end of the connecting member is connected to the branch support. On the same longitudinal section, the angle between the length extension direction of the connecting member and the outer surface of the branch support is in the range of 0 to 90°.

[0013] In one embodiment, one end of the connecting member is arranged closer to the proximal end of the main support than the other end of the connecting member.

[0014] In one embodiment, the connecting member includes an elastic section and a connecting section, and the elastic section includes a spiral structure or a planar folded structure.

[0015] In one embodiment, the elastic section is in a stretched state.

[0016] In one embodiment, the luminal stent includes a plurality of the connecting members, and the plurality of the connecting members are arranged in an axial direction or staggered along the branch stent.

[0017] In one embodiment, the connecting member includes a middle section and elastic sections provided at both ends of the middle section, the middle section is arc-shaped and is connected to the branch bracket or the main bracket, and the elastic sections connected to the two ends of the middle section are respectively provided on both sides of the branch bracket.

[0018] In one embodiment, the connecting member includes at least one support rod that can recover its deformation, and the support rod is fitted on the inner surface and / or outer surface of the branch bracket, and one end of the support rod is closer to the proximal end of the branch bracket than the other end of the support rod.

[0019] In one embodiment, a window is provided on the surface of the main support, the inner cavity of the branch support is connected to the window, and an annular support is provided on the edge of the window.

[0020] In one embodiment, a window is provided on the surface of the main bracket, the inner cavity of the branch bracket is connected to the window, the branch bracket includes a main section and a transition section, the transition section is sealed to the window, one end of the main section is connected to the transition section, and the other end of the main section is a free end.

[0021] In one embodiment, the angle between the axial direction of the main body segment and the axial direction of the main body support is in the range of 0° to 15°.

[0022] According to the luminal stent of the present invention, an implantation channel for the bridging stent is established through the branch stent, so that the bridging stent is inserted into the branch blood vessel through the branch stent, and the branch blood vessel can be reconstructed. At the same time, by setting a connector, the branch stent can be provided with elastic force to restore deformation, which can ensure that the branch stent has a certain range of deformation. When the bridging stent is inserted into the branch stent, the branch stent is deformed under the action of the bridging stent, thereby facilitating the implantation process of the branch stent and will not cause displacement of the main stent. When the implantation of the bridging stent is completed, the deformed branch stent is restored to its original state under the elastic force provided by the connector to restore deformation, thereby effectively establishing a channel for the implantation of the bridging stent, facilitating the implantation of the bridging stent, and preventing the occurrence of bridging stent blockage caused by displacement of the main stent, ensuring that the implanted bridging stent will not affect the normal blood circulation in the branch blood vessel, and ensuring the safety and reliability of the use of the luminal stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be construed as limiting the present invention.

[0024] Figure 1 This is a partial structural diagram of the embodiment 1 of the luminal stent;

[0025] Figure 2 for Figure 1 Schematic diagram of the decomposed structure of the middle branch bracket;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of the connecting parts;

[0027] Figure 4 for Figure 1 Schematic diagram of the end structure of the mid-lumen stent;

[0028] Figure 5for Figure 1 A schematic diagram of the end structure of another example of a mid-lumen stent;

[0029] Figure 6 for Figure 5 A schematic structural diagram of a connector of another example of a mid-lumen stent;

[0030] Figure 7 for Figure 1 Schematic diagram of the structure of a mid-lumen stent placed in the left subclavian femoral artery in the arch;

[0031] Figure 8 To pass Figure 1 Schematic diagram of the structure of the mid-lumen stent during bridging stent implantation;

[0032] Figure 9 To pass Figure 1 Schematic diagram of the structure of the mid-lumen stent after the bridging stent is implanted;

[0033] Figure 10 This is a partial structural diagram of a second embodiment of the luminal stent;

[0034] Figure 11 for Figure 10 Schematic diagram of the structure of the middle branch stent;

[0035] The reference numerals in the accompanying drawings represent the following:

[0036] 100: Lumen stent;

[0037] 10: Main frame, 11: Corrugated ring, 12: Covering film, 121: Window;

[0038] 20: branch bracket, 21: main section, 22: transition section, 221: small diameter end, 222: large diameter end;

[0039] 30: Connecting piece, 31: Elastic section, 32: First connecting section, 33: Second connecting section, 34: Middle section;

[0040] 40: bridging stent;

[0041] 200: left subclavian artery in the arch;

[0042] 300: supra-arch branch arteries. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. These embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the concepts of the present invention to those skilled in the art.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0046] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0047] To more clearly describe the structure of this application, the terms "proximal" and "distal" are defined herein as commonly used in the field of interventional medicine. Specifically, "distal" refers to the end from which blood flows out, and "proximal" refers to the end from which blood flows in. For example, after stent implantation, blood flows from the proximal end to the distal end of the stent. "Axial" refers to the longitudinal direction of the stent, and "radial" refers to the direction perpendicular to the "axial" direction.

[0048] Implementation Method 1

[0049] like Figure 1 As shown, the luminal stent 100 of this embodiment includes a main stent 10, a branch stent 20 and a connector 30. The main stent 10 includes a wave ring 11 and a tubular coating 12. A plurality of wave rings 11 are arranged at intervals along the axial direction and are connected by the coating 12, so that the main stent 10 is formed into a tubular structure with openings at both ends. Among them, a window 121 is provided on the surface of the main stent 10. The window 121 is provided at a position on the coating 12 where no wave ring 11 is provided, so as to ensure that the bridging stent for implantation can pass through the window 121 smoothly. The branch stent 20 is provided in the lumen of the main stent 10 and is connected to the window 121. At least a part of the branch stent 20 can move as if it were the main stent 10. The connector 30 connects the main stent 10 and the branch stent 20, and is used to limit the range of movement of the branch stent 20. In other embodiments, the window 121 may not be set on the surface of the main stent 10, the inner cavity of the branch stent 20 is connected to the inner cavity of the main stent 10, and the bridging stent can enter the main stent 10 from the distal end of the main stent 10 to communicate with the branch stent 20.

[0050] According to the endovascular stent 100 of the present invention, a window 121 is provided on the surface of the main stent 10, and a branch stent 20 connected to the window 121 is provided in the lumen of the main stent 10. A channel for implanting a bridging stent is established through the branch stent 20, and the bridging stent is inserted into the branch blood vessel, thereby reconstructing the branch blood vessel. At the same time, a connector 30 is provided between the main stent 10 and the branch stent 20. The connector 30 is used to provide a force to restore the branch stent 20 to its initial state and to ensure that the branch stent 20 has a certain range of deformation. When the bridging stent is inserted into the branch stent 20, the branch stent 20 partially deforms under the action of the bridging stent, thereby facilitating the implantation of the bridging stent. After the implantation of the bridging stent is completed, the deformed branch stent 20 is restored to its original state under the action of the deformation restoring force provided by the connector 30, thereby effectively establishing a channel for implanting the bridging stent, facilitating the implantation of the bridging stent, and ensuring the safety and reliability of the use of the endovascular stent 100.

[0051] The branch stent 20 includes a corrugated ring (not numbered in the figure) and a covering film (not numbered in the figure), and a plurality of corrugated rings are connected by the covering film. Figure 2As shown, the branch stent 20 includes a main body section 21 and a transition section 22. The distal end of the transition section 22 is sealed and connected to the window 121, and the distal end of the main body section 21 is connected to the proximal end of the transition section 22. The proximal end of the main body section 21 is a free end and is arranged toward the proximal end of the main body stent 10. In order to facilitate the description and analysis of the branch stent 20, Figure 2 The structure of the branch stent 20 is decomposed, so that a detachable two-section structure is formed between the main section 21 and the transition section 22. In other examples of this embodiment, the insertion end 21 and the transition section 22 can also be an integral structure, formed by arranging multiple corrugations at intervals and coating them with a film. The axis of the main section 21 is generally parallel to the axis of the main stent 10; the transition section 22 includes a small diameter end 221 and a large diameter end 222. The small diameter end 221 is connected to the distal end of the main section 21, and the radial dimension of the small diameter end 221 is consistent with the radial dimension of the main section 21, thereby achieving a natural transition between the main section 21 and the transition section 22. The large diameter end 222 is connected to the window 121, and the radial dimension of the large diameter end 222 is consistent with the dimension of the window 121, thereby achieving a sealed connection between the transition section 22 and the window 121. The surface between the small diameter end 221 and the large diameter end 222 is naturally transitioned, and the transition section 22 is slightly curved toward the distal end. The distal end of the transition section 22 may be connected to the window 121 by suturing or the like, and an annular support may be provided at the edge of the large diameter end 222 of the transition section 22 or the edge of the window 121 to maintain the shape of the window 121 stable.

[0052] The diameter of the main body segment 21 of this embodiment can be in the range of 4 mm to 16 mm, and the axial length can be in the range of 2 mm to 20 mm. The shape of the window 121 of the main body stent 10 is not limited and can be circular, elliptical, or any other shape. The radial dimension of the window 121 is preferably larger than the diameter of the main body segment 21 to facilitate implantation of the bridging stent.

[0053] Combine Figures 1 to 3As shown, the connecting piece 30 of this embodiment is elastic and includes an elastic segment 31 and connecting segments arranged at both ends of the elastic segment 31 (for the convenience of description, hereinafter referred to as the first connecting segment 32 and the second connecting segment 33), wherein the first connecting segment 32 is connected to the main bracket 10, and the second connecting segment 33 is connected to the branch bracket 20. On the same longitudinal section, the angle between the length extension direction of the connector 30 and the outer surface of the branch stent 20 ranges from 0 to 90 degrees, that is, the angle between the force direction of the connector 30 and the outer surface of the branch stent 20 ranges from 0 to 90 degrees, and in some embodiments, before the bridging stent is implanted, the elastic section 31 of the connector 30 can be in a stretched state, thereby providing a certain pulling force to the branch stent 20 through the connector 30, ensuring that the deformed branch stent 20 returns to its original shape (or at least partially returns to its original shape) under the action of the connector 30, while providing the branch stent 20 with a certain amount of movement space relative to the main stent 10. However, at the same time, the connector 30 can also play a certain restraining role, limiting the range of movement of the branch stent 20, thereby preventing the branch stent 20 from shaking under the impact of blood, thereby affecting the normal flow of blood. It is understandable that in some embodiments, before the bridging stent is implanted, the connector 30 can also be in a naturally relaxed state.

[0054] It is understandable that, in other embodiments, the connector may also be provided with only one connecting section. In this case, the other end of the elastic section is directly connected to the branch bracket or the main bracket.

[0055] Specifically, the connector 30 can be formed from a single or multiple strands of nickel-titanium or stainless steel wire, folded in a spiral or flat pattern. Alternatively, it can be made of a folded biocompatible coating material, such as an artificial blood vessel. To ensure that the connector 30 fully stretches when subjected to an appropriate pulling force, returns to its original state after the force is released, and maintains a certain degree of stability, the elastic section 31 of the connector 30 has a stiffness coefficient K within the range of 0 < K < 100 N / M.

[0056] The first connecting section 32 of the connecting piece 30 can be arranged closer to the proximal end of the main stent 10 than the second connecting section 33 (that is, the angle between the force direction of the connecting piece 30 and the outer surface of the branch stent 20 is greater than 0 degrees), so that the branch stent 20 is always arranged toward the proximal end of the luminal stent 100 under the tension of the connecting piece 30, thereby making the branch stent 20 sufficiently close to the inner surface of the main stent 10, thereby reducing or eliminating the gap between the main stent 10 and the branch stent 20, thereby minimizing the influence of the branch stent 20 on the blood flow in the main stent 10 and reducing the formation of thrombus.

[0057] like Figure 4As shown, the connector 30 is disposed between the outer surface of the branch stent 20 away from the central axis of the main stent 10 and the main stent 10, thereby facilitating the connection between the branch stent 20 and the main stent 10, allowing the branch stent 20 to fit closely to the inner surface of the main stent 10 and reducing deformation of the branch stent 20. At the same time, it avoids affecting the blood flow in the lumen of the main stent 10 due to the large spatial distribution range of the connector 30 in the lumen of the main stent 10. Accordingly, the first connecting section 32 connected to the inner surface of the main stent 10 is preferentially distributed in the circumferential area corresponding to the horizontal plane tangent to the lower edge of the proximal surface of the branch stent 20, wherein, Figure 4 The middle dotted line shows a horizontal plane tangent to the lower edge of the proximal end surface of the branch stent 20.

[0058] Before being implanted into the body, the angle between the axial direction of the main segment 21 and the axial direction of the main stent 10 is in the range of 0° to 15°, preferably 0°. The setting of this angle can reduce the difficulty of implanting the bridging stent to a certain extent and will not have a significant impact on the blood flow in the lumen of the main stent 10.

[0059] Recombination Figure 1 and Figure 4 As shown, the number of connectors 30 in this embodiment is two, and both connectors 30 are arranged on the same side of the branch stent 20 along the axial direction. In other examples of this embodiment, one or more connectors 30 may also be provided. For example, multiple connectors 30 may be axially provided on the same side of the branch stent 20, and multiple connectors may be arranged axially or staggered. From the proximal end of the main section 21 toward the distal end, the displacement of the main section 21 gradually decreases. Therefore, the deformable length of the multiple connectors 30 arranged along the axial direction of the main section 21 may gradually decrease, thereby reducing the length of the connector 30 accordingly, thereby reducing the cost. In other embodiments, one or more connectors 30 may also be provided on the transition section 22.

[0060] like Figure 5 As shown, in another example of this embodiment, connecting members 30 are provided on both side surfaces of the branch bracket 20, and the main bracket 10 and the branch bracket 20 are connected at the same time through the connecting members 30 on both sides, so that the force on the branch bracket 20 is more balanced, further improving the stability of the branch bracket 20.

[0061] In this embodiment, the first connecting section 32 and the second connecting section 33 of the elastic member 30 can be respectively connected to the wave ring or the coating of the main bracket 10 and the branch bracket 20, preferably connected to the wave ring, so as to avoid damage to the coating 12 under the tension of the connecting member 30 and avoid the occurrence of internal leakage.

[0062] like Figure 6As shown, in another example of this embodiment, the connecting member 30 includes a middle section 34 and elastic sections 31 provided at both ends of the middle section 34. The middle section 34 is arc-shaped and is connected to the branch bracket 20. Specifically, the middle section 34 is connected to the outer surface of the branch bracket 20 facing the central axis of the main bracket 10. The middle section 34 can be consistent with the shape of part of the outer surface of the branch bracket 20, so that the middle section 34 is completely in contact with the outer surface of the branch bracket 20 facing the central axis of the main bracket 10, or it can be another shape and only partially in contact with the outer surface of the branch bracket 20 facing the central axis of the main bracket 10. The elastic sections 31 at both ends of the middle section 34 are respectively provided on either side of the branch bracket 20. The elastic sections 31 on both sides are connected to the main bracket 10 via the first connecting section 32, thereby forming a U-shaped structure of the connecting member 34. This further expands the contact area between the connecting member 30 and the embedded branch 20, making the tensile force provided by the connecting member 30 to the branch bracket 20 more evenly distributed, reducing damage to the membrane covering the branch bracket 20, and further improving the deformation resistance and deformation recovery ability of the branch bracket 20. The elastic section 31 can be crimped, welded, or integrally formed with the middle section 34 via the second connecting section 32.

[0063] The luminal stent 100 of this embodiment can also be provided with a plurality of windows 121 and a plurality of branch stents 20 on the surface of the main stent 10. The plurality of windows 121 are spaced apart along the axial direction of the main stent 10, so that the specific fixed position of the main stent 10 can be adjusted according to the structure of the arterial blood vessel, thereby reconstructing the blood supply of the plurality of branch vessels. It is understood that in this embodiment, the main section of the branch stent is closer to the proximal end of the main stent than the transition section. In other embodiments, the main section of the branch stent can also be closer to the distal end of the main stent than the transition section. Alternatively, when multiple branch stents are provided, the main sections of some of the branch stents are closer to the proximal end of the main stent, while the main sections of other branch stents are closer to the distal end of the main stent.

[0064] In other examples of this embodiment, the middle section 34 is a partial structure of the branch stent 20, that is, the middle section 34 is one of the multiple corrugations constituting the branch stent 20, and the corrugation is disconnected, with an elastic section 31 provided at each end of the disconnection. In other examples of this embodiment, the middle section 34 may also be connected to the main stent 10, or the middle section 34 may be a partial structure of the main stent 10, and the composition structure is consistent with the relationship between the middle section 34 and the branch stent 20, which will not be further described here.

[0065] In other embodiments, a recessed section (not shown) can be formed on the surface of the main stent 10. The recessed section can be formed as an inclined surface at a certain angle to the surface of the main stent 10. A window 121 can be set on the inclined surface. The distal end of the transition section 22 can also be connected to the inclined surface on the recessed section. The recessed section can provide the bridging stent with a larger extension space at the connection portion between the bridging stent and the main stent 10 when the bridging stent is implanted, so that the bridging stent is not easily blocked during and after implantation.

[0066] Combine Figures 7 to 9 As shown, when the endoluminal stent 100 of this embodiment is used to reconstruct the supra-arch branch artery 300, the endoluminal stent 100 is placed in the arch of the left subclavian artery 200, and the window 121 is set corresponding to the entrance of the supra-arch branch artery 300. The bridging stent 40 is delivered to the endoluminal stent 100 through the guide wire and the sheath, and the bridging stent 40 is placed inside the sheath, wherein Figure 8 The direction indicated by the dotted arrow is the insertion direction of the guidewire and sheath. During this insertion process, the branch stent 20 is deformed, and the main section is away from the inner surface of the main stent, thereby facilitating the implantation of the bridging stent. When the bridging stent 40 is extended to the outside of the main stent 10 and placed in the supra-arch branch artery 300 under the action of the guidewire and sheath, the guidewire and sheath are withdrawn, and the bridging stent 40 expands and deforms, thereby reconstructing the supra-arch branch artery 300 and ensuring normal blood flow between the supra-arch branch artery 300 and the arch left subclavian femoral artery 200. At the same time, when the guidewire and sheath are withdrawn, the branch stent 20 returns to its original position under the action of the elastic member 30, and does not hinder the blood flow in the arch left subclavian femoral artery 200. At the same time, under the action of the connecting member 30, the branch stent 20 does not swing with the flow of blood, thereby improving the safety and reliability of the use of the luminal stent 100.

[0067] Implementation Method 2

[0068] like Figure 10 As shown, the structure of the endoluminal stent 100 of this embodiment is substantially the same as that of the first embodiment, except for the structure and location of the connector 30 .

[0069] like Figure 11 As shown, the connector 30 of the endoluminal stent 100 of this embodiment is fitted to the inner surface and / or outer surface of the branch stent 20, and one end of the connector 30 is closer to the proximal end of the branch stent 20 than the other end. The connector 30 is used to provide elastic force to the branch stent 20 to restore deformation.

[0070] The connector 30 of this embodiment includes a support rod, and the material of the support rod is preferably a superelastic nickel-titanium alloy with a diameter of 0.05mm to 0.3mm. In one example, the connector 30 and the branch stent 20 are a split structure. Specifically, the proximal end of the connector 30 is connected to the proximal end of the branch stent 20, and the distal end of the connector 30 is connected to the distal end of the branch stent 20, thereby providing support force to the branch stent 20 in the axial direction, improving the ability of the branch stent 20 to recover deformation in the axial direction, and allowing the branch stent 20 to have a certain range of deformation, thereby preventing the branch stent 20 from shrinking during the implantation of the bridging stent and affecting the subsequent implantation of the bridging stent. The specific shape of the support rod is not required, and it can be one or a combination of straight, wavy or arc shapes.

[0071] When a support member is provided at the window 121, the distal end of the connector 30 is connected to the support member. When the embedded branch 30 is subjected to the force of the guide wire and the sheath, the setting of the connector 30 makes the integrity of the main section 21 and the transition section 22 better, and since the connector 30 is connected to the main support 10, the embedded branch 20 is more stable. After the bridging stent is implanted, the embedded branch 20 is more easily restored to its original state under the force of the main support 10 after deformation.

[0072] In other examples of this embodiment, the connector 30 can also be a partial structure of the branch stent 20. Specifically, the connector 30 and the main section 21 are an integrated structure, the proximal end of the connector 30 is arranged at the proximal end of the main section 21, and the distal end of the connector 30 extends to the transition section 22, specifically arranged at the distal end of the transition section 22, and is connected to the transition section 22 by suturing, crimping, bonding, etc., so as to realize the arrangement of the connector 30 along the axial direction of the branch stent 20, so as to provide the branch stent 20 with supporting force and elastic force for restoring deformation, so that the branch stent 20 can undergo a certain deformation after being axially squeezed by the bridging stent, which is convenient for the implantation process of the bridging stent. At the same time, after the implantation of the bridging stent is completed, the branch stent 20 is restored to its original state through the action of the connector 30.

[0073] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A luminal stent, characterized in that: include: The main body support is a tubular structure with openings at both ends; a branch stent, the branch stent being disposed in the lumen of the main stent, and at least a portion of the branch stent being movable relative to the main stent; A connecting piece, wherein the connecting piece is arranged between the inner surface of the main bracket and the inner surface of the branch bracket, one end of the connecting piece is connected to the main bracket, and the other end of the connecting piece is connected to the branch bracket, the connecting piece is elastic and is used to limit the range of movement of the branch bracket, the surface of the main bracket is provided with a window, the inner cavity of the branch bracket is connected to the window, the branch bracket includes a main section and a transition section, the transition section is sealed and connected to the window, one end of the main section is connected to the transition section, and the other end of the main section is a free end; the branch bracket is used to establish an implantation channel for the bridging bracket, and when the bridging bracket is implanted into the branch bracket, the branch bracket is deformed, and the main section is away from the inner surface of the main bracket, thereby facilitating the implantation of the bridging bracket, and when the implantation of the bridging bracket is completed, the deformed branch bracket is restored to its original position under the action of the deformation recovery force provided by the connecting piece, thereby reducing the gap between the main bracket and the branch bracket.

2. The endoluminal stent according to claim 1, characterized in that: On the same longitudinal section, the angle between the length extension direction of the connecting member and the outer surface of the branch bracket ranges from 0° to 90°.

3. The endoluminal stent according to claim 2, characterized in that: One end of the connecting member is arranged closer to the proximal end of the main body support than the other end of the connecting member.

4. The endoluminal stent according to claim 2, characterized in that: The connecting piece includes an elastic section and a connecting section, and the elastic section includes a spiral structure or a planar folding structure.

5. The endoluminal stent according to claim 4, characterized in that: The elastic section is in a stretched state.

6. The endoluminal stent according to claim 2, characterized in that: The luminal stent includes a plurality of the connecting pieces, and the plurality of the connecting pieces are arranged in an axial direction or staggered along the branch stent.

7. The endoluminal stent according to claim 2, characterized in that: The connecting member includes a middle section and elastic sections arranged at both ends of the middle section. The middle section is arc-shaped and connected to the branch bracket or the main bracket. The elastic sections connected to both ends of the middle section are respectively arranged on both sides of the branch bracket.

8. The endoluminal stent according to claim 1, characterized in that: The connecting member includes at least one support rod that can recover its deformation, and the support rod is fitted on the inner surface and / or outer surface of the branch bracket, and one end of the support rod is closer to the proximal end of the branch bracket than the other end of the support rod. The endoluminal stent according to claim 1 , wherein an annular support member is provided on the edge of the window.

10. The endoluminal stent according to claim 1, characterized in that: The angle between the axial direction of the main body segment and the axial direction of the main body bracket is in the range of 0° to 15°.

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