Lumen stent

Abstract

This invention provides a luminal stent, comprising a main stent and a mesh cap connected to the main stent. The main stent has a radially inwardly recessed side surface forming a groove. At least a portion of the mesh cap and the bottom of the groove form a radial gap in the radial direction of the luminal stent. The mesh cap includes a side end connector and a middle end connector connected to the main stent. The side end connector is closer to the radial edge of the mesh cap than the middle end connector. The middle end connector located proximal to the mesh cap is closer to the proximal end of the luminal stent than the side end connector located proximal to the mesh cap. And / or, the middle end connector located distal to the mesh cap is closer to the distal end of the luminal stent than the side end connector located distal to the mesh cap. This invention can reduce the risk of the vessel wall obstructing guidewires and bridging stents due to encroachment on the groove space.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to a lumen stent. Background Technology

[0002] Traditional open surgery for vascular diseases such as aortic aneurysms and aortic dissections is characterized by significant trauma, high mortality, long operation time, high postoperative complication rate, and high surgical difficulty. In contrast, minimally invasive interventional procedures offer advantages such as minimal trauma, high safety, and high effectiveness, thus gaining acceptance from both doctors and patients and becoming an important treatment method for vascular diseases. Interventional treatment involves implanting a vascular stent into the diseased segment of the blood vessel using a delivery system. The implanted stent expands to support the narrowed or occluded segment of the vessel or seals the tear in the dissection, reducing elastic recoil and remodeling of the vessel, maintaining unobstructed blood flow, and preventing further stenosis.

[0003] When an aneurysm or arterial dissection is located on the aorta near a branch vessel, a grooved stent can be implanted. The groove corresponds to the branch vessel, allowing blood from the aorta to flow through the groove into the branch vessel. This not only supports the narrowed or occluded segment of the vessel or seals the dissection opening but also maintains unobstructed blood flow to the branch. However, for vessels with excessively narrow or tortuous true lumens, the lumen may compress the groove, reducing the operating space and preventing the guidewire and bridging stent from entering the groove. Summary of the Invention

[0004] To address the shortcomings of the aforementioned technologies, this invention provides a luminal stent that reduces the risk of the blood vessel wall obstructing the guidewire and bridging stent due to encroachment on the groove space.

[0005] A lumen stent includes a main support and a mesh cover connected to the main support. The side of the main support is radially recessed to form a groove. At least a portion of the mesh cover and the bottom of the groove form a radial gap in the radial direction of the lumen stent. The mesh cover includes a side end connector and a middle end connector connected to the main support. The side end connector is closer to the radial edge of the mesh cover than the middle end connector. The middle end connector located near the proximal end of the mesh cover is closer to the proximal end of the lumen stent than the side end connector located near the proximal end of the mesh cover. And / or, the middle end connector located at the distal end of the mesh cover is closer to the distal end of the lumen stent than the side end connector located at the distal end of the mesh cover.

[0006] In one embodiment, the intermediate end connector is connected to the axial edge of the groove, and the side end connector is connected to the axial edge and / or radial edge of the groove.

[0007] In one embodiment, the intermediate end connector includes an intermediate wave angle, the intermediate wave angle including a vertex connected to an axial end of the groove and two wave rods extending from the vertex toward another axial end of the groove.

[0008] In one embodiment, the main support further includes a main body cover, and the inner wall of the main support is provided with a double-branch support. The branch openings of the double-branch support are located near one axial end of the groove, and a gap is formed between the branch openings of the double-branch support. The intermediate end connector is connected to the main body cover at the gap.

[0009] In one embodiment, the branch edges of the dual-branch bracket are further provided with support members, and at least a portion of the support members at the branch edges are connected to the main body film and located on both sides of the middle end connector.

[0010] In one embodiment, the mesh cover further includes a bending portion comprising a first rod and a second rod connected to each other, forming a bending angle between the first rod and the second rod, the first rod extending from the bending angle toward one axial end of the mesh cover, and the second rod extending from the bending angle toward another axial end of the mesh cover.

[0011] In one embodiment, the intermediate end connector includes an intermediate wave angle, the intermediate wave angle including a vertex and a wave rod connected to the vertex, the wave rod crossing the bend from above the bend.

[0012] In one embodiment, the wave rod of the intermediate wave angle contacts the bend, or there is a gap between the wave rod of the intermediate wave angle and the bend in the radial direction of the lumen support.

[0013] In one embodiment, the mesh cover includes a first mesh area and at least two second mesh areas respectively connected to both sides of the first mesh area; the second mesh area includes at least one row of hook units, and the first mesh area includes multiple rows of cross units.

[0014] In one embodiment, the vertex of the intermediate wave angle is axially opposite to the first mesh region, and the two wave rods of the intermediate wave angle extend from the vertex of the intermediate wave angle in a direction away from each other to connect with the second mesh regions on both sides of the first mesh region, respectively.

[0015] In one embodiment, the end of the wave rod of the intermediate wave angle away from the vertex of the intermediate wave angle is connected to the hook unit of the second mesh region.

[0016] In one embodiment, the side end connector includes an edge bevel, the edge bevel including a vertex, the vertex of the edge bevel connecting to the corner of the groove.

[0017] The beneficial effects of the present invention are as follows: Compared with the prior art, since the intermediate end connector is connected to the main stent, when the main stent is bent, it can better drive the mesh cover to bend and deform in accordance with the shape of the blood vessel. In addition, the intermediate end connector connected to the main stent can also provide better support for the axial end of the groove, avoiding the formation of an axial gap between the main stent and the intermediate end connector when the lumen stent is bent. This prevents the narrow inner wall of the blood vessel from squeezing the gap and entering the inner space of the groove from the gap, thereby blocking the guidewire and bridging stent from entering the branch stent. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the lumen support of the present invention;

[0019] Figure 2 This is a schematic diagram of the unfolded mesh cover structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the unfolded mesh cover structure according to another embodiment of the present invention;

[0021] Figure 4 This is a perspective view of the mesh cover structure of the present invention;

[0022] Figure 5 For the present invention Figure 4 Enlarged view of a portion of position A in the middle;

[0023] Figure 6 For the present invention Figure 4 Enlarged view of a portion of position B in the middle;

[0024] Figure 7 For the present invention Figure 4 Enlarged view of the middle C position;

[0025] Figure 8 For the present invention Figure 4 Enlarged view of a portion of position D;

[0026] Figure 9 This is a perspective view of the mesh cover structure in another embodiment of the present invention;

[0027] Figure 10 For the present invention Figure 9 Enlarged view of a portion of position E in the middle;

[0028] Figure 11 This is a perspective view of the mesh cover structure in another embodiment of the present invention;

[0029] Figure 12This is a three-dimensional schematic diagram of the proximal segment of the lumen stent of the present invention;

[0030] Figure 13 For the present invention Figure 12 Enlarged view of the middle F position;

[0031] Figure 14 This is a schematic diagram of the suture between the intermediate wave angle and the proximal body coating in an embodiment of the present invention;

[0032] Figure 15 For the present invention Figure 14 Enlarged view of the middle G position. Detailed Implementation

[0033] To better understand the concept of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following specific embodiments are only some embodiments of the present invention and are not intended to limit the present invention.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0035] To more clearly describe the structure of this application, the terms "proximal" and "distal" are used herein as conventional terms 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 of the stent toward the distal end; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0036] The "wave loop" (also referred to as a waveform ring) in this invention is a closed ring structure, and the "wave unit" is an arc-shaped structure. The "wave loop" and "wave unit" are woven or cut from a metallic elastic material or a polymer material. The metallic elastic material includes known materials used in implantable medical devices or combinations of various biocompatible materials, such as alloys of two or more single metals from cobalt, chromium, nickel, titanium, magnesium, and iron, as well as 316L stainless steel, nickel-titanium-tantalum alloys, or other biocompatible metallic elastic materials. The polymer material includes biocompatible materials such as polylactic acid. Both the "wave loop" and "wave unit" have radial expansion capabilities, allowing them to radially contract under external force and recover to their initial shape and maintain it after the external force is removed, either by self-expansion or mechanical expansion (e.g., balloon expansion). Thus, after implantation into a lumen, their radial support force allows them to adhere tightly to the inner wall of the lumen. The waveform of the wave in the "wave loop" and "wave unit" is not limited and includes Z-shaped waves, M-shaped waves, V-shaped waves, sine waves, etc. Both "wave loops" and "waveform units" include multiple wave crests (also known as near-end vertices), multiple wave troughs (also known as far-end vertices), and wave rods connecting adjacent wave crests and troughs. Among them, a vertex (near-end vertex or far-end vertex) and the two wave rods connected to that vertex form a wave.

[0037] The "coating" in this invention can isolate liquids to a certain extent, and it can be made of polymer materials with good biocompatibility, such as polytetrafluoroethylene (PTFE) and polyethylene terephthalate (PET).

[0038] Example 1

[0039] Please see Figure 1 The luminal stent 100 of this embodiment includes a main stent 10 and a mesh cover 4 connected to the main stent 10. The main stent 10 is a hollow tubular structure with openings at both ends. Its side is radially recessed to form a groove 5. The mesh cover 4 is connected to the groove 5, and at least a portion of the mesh cover 4 and the bottom 51 of the groove 5 form a radial gap in the radial direction of the luminal stent 100. This radial gap communicates with the inner lumen of the main stent 10. The luminal stent 100 of the present invention is applicable to various blood vessels. The embodiment of the present invention uses the aortic arch as the target for implantation into the lumen for illustration. The aortic arch has a greater curvature side (i.e., the side with a smaller curvature and a larger radius of curvature) and a lesser curvature side (i.e., the side with a larger curvature and a smaller radius of curvature). When the luminal stent 100 is implanted into the aortic arch, the mesh cover 4 faces the greater curvature side and is opposite to the branch vessels. The external bridging stent connects to the branch vessels and passes through the mesh of the mesh cover 4 and communicates with the main stent 10 through the groove 5.

[0040] The main support 10 includes a main support portion and a main cover 31. The main cover 31 can be provided on the inner surface and / or the outer surface of the main support portion, or the main cover 31 can be provided on a portion of the inner surface of the main support portion and a portion of the outer surface of the main support portion.

[0041] Please see Figure 1 The main support 10 can be divided axially into a proximal segment 2, a distal segment 1, and an intermediate segment 7 located between the proximal segment 2 and the distal segment 1. The proximal segment 2 includes a tubular proximal support and a proximal main body covering, which can be applied to the inner and / or outer side of the proximal support by methods such as sewing, bonding, or heat fusion. The proximal support includes multiple axially spaced main body corrugations. The distal segment 1 includes a tubular distal support and a distal main body covering, which can also be applied to the inner and / or outer side of the distal support by methods such as sewing, bonding, or heat fusion. The distal support includes multiple axially spaced main body corrugations.

[0042] The intermediate segment 7 includes an intermediate unit and at least one mesh cover 4. The intermediate unit includes an intermediate main body film 3 and an intermediate support portion (which may be omitted in other embodiments). The inner cavity formed by the intermediate main body film 3 is connected to the inner cavity formed by the proximal main body film and the inner cavity formed by the distal main body film; wherein the side of the intermediate unit is radially recessed inward to form a groove 5, and part of the intermediate main body film 3 serves as the film covering the bottom 51 of the groove 5, and the bottom 51 of the groove 5 may also be provided with a bottom support member, which may include one or more of the wave unit, mesh structure, etc., and in other embodiments, the bottom support member may be omitted. The two radially opposite sides of the mesh cover 4 are fixedly connected to the intermediate main body film 3 by means of sewing, bonding, heat fusion, etc., and at least a part of the mesh cover 4 forms a radial gap (or gap, void, cavity) with the outer surface of the intermediate unit 51.

[0043] Branch supports 6 can be provided in both the proximal segment 2 and / or the distal segment 1. The inner cavity of the branch support 6 is connected to the inner cavity of the main support 10 and is connected to the radial gap formed between the bottom 51 of the groove 5 and the mesh cover 4. Multiple branch supports 6 can be provided. For example, branch supports 10 are provided at the proximal position near the groove 5 and at the distal position near the groove 5, respectively.

[0044] Please see Figure 2 and Figure 4In one embodiment, the mesh cover 4 has an arc-shaped structure in the circumferential direction of the lumen support 100, and is formed into a mesh structure by weaving with braided yarns. For example, the mesh cover 4 can be formed by integral weaving of braided yarns, or it can be formed by weaving separately and then splicing together. In other embodiments, the mesh cover 4 can also be manufactured by cutting. The central angle corresponding to the projection of the mesh cover 4 on the radial plane of the lumen support 100 can be less than or equal to 180 degrees, so that the mesh cover 4 has good radial support force and ensures that there is sufficient space in the intermediate unit for blood flow.

[0045] In this embodiment, the projection of the edge of the groove 5 onto the plane passing through its radially adjacent edges is approximately rectangular (or the opening of the groove 5 is approximately rectangular). The groove 5 includes a first edge, a second edge, a third edge, and a fourth edge, which together form the opening of the groove 5. The first and second edges are radially opposite to each other on the lumen support 100, and their extending directions are consistent with the length extension direction of the lumen support 100. The third and fourth edges are axially opposite to each other on the lumen support 100. It is understood that in other embodiments, the opening of the groove 5 can also be any other suitable shape. For example, the first and second edges can form an angle with the axis of the lumen support 100, making the opening of the groove 5 approximately trapezoidal; or, the first and second edges can be arc-shaped, making the opening of the groove 5 similarly elliptical. This invention does not limit the specific shape of the groove 5. In this embodiment, please refer to... Figure 2 and Figure 3 Along the circumference of the lumen stent 100, the mesh cover 4 includes a first mesh region 41 and a second mesh region 42 that are interconnected. Both the first mesh region 41 and the second mesh region 42 can be radially contracted under the action of external force, and after the external force is removed, they can self-expand or be mechanically expanded (e.g., by balloon expansion) to return to and maintain their initial shape. Preferably, along the circumference of the lumen stent 100, the mesh cover 4 includes a first mesh region 41 and two second mesh regions 42 that are respectively connected to both sides of the first mesh region 41.

[0046] Please see Figure 7The first mesh region 41 includes multiple spaced-apart first-direction support wires 481 and multiple spaced-apart second-direction support wires 482. The first-direction support wires 481 extend generally along the first direction, and the second-direction support wires 482 extend generally along the second direction. The first-direction support wires 481 and the second-direction support wires 482 overlap (or interweave) to form multiple rows of mesh openings and multiple rows of cross units 48. Each row of mesh openings includes multiple mesh openings arranged generally along the axial direction. Each row of cross units 48 includes multiple cross units 48 arranged generally along the axial direction. The mesh openings are generally rhomboid, but can also be square, rectangular, or other shapes; four cross units 48 are correspondingly arranged at the four corners of the mesh openings. Each cross unit 48 includes an intersection point formed by the overlap of the first-direction support wires 481 and the second-direction support wires 482, at which the first-direction support wires 481 and the second-direction support wires 482 can move relative to each other. In some of the cross units 48, the first directional support wire 481 is located outside the second directional support wire 482, and in others, it is located inside the second directional support wire 482. In other embodiments, all the first directional support wires 481 in the first mesh region 41 are located outside the second directional support wire 482, or all the first directional support wires 481 are located inside the second directional support wire 482. Since the first directional support wires 481 and second directional support wires 482 at the intersection points of the cross units 48 overlap and can move relative to each other, the mesh openings in the first mesh region 41 can deform and enlarge under external force to facilitate the passage of the guide wire and bridging stent through the mesh openings. When the external force is removed, the mesh openings can retract to provide some support and limitation for the bridging stent, reducing the swaying of the bridging stent with blood flow or heartbeat, and ensuring the stability of branch blood supply.

[0047] Please see Figure 6The second mesh region 42 includes at least one row of hook units 47, each row of hook units 47 including multiple hook units 47 arranged sequentially along the axial direction, and each hook unit 47 including a first hook 471 and a second hook 472. The first hook 471 and the second hook 472 are both part of the support wire; the first hook 471 includes a wave bulging towards the distal end, specifically including a trough 4711 (also called the distal vertex) and two first wave rods 4712 connected to the trough 4711; the second hook 472 includes a wave bulging towards the proximal end, specifically including a crest 4721 (also called the proximal vertex) and two second wave rods 4722 connected to the crest 4721. In this embodiment, the first hook 471 and the second hook 472 of each hook unit 47 are generally hooked to each other along the axial direction. It should be noted that "approximately along the axial direction" here means that the line connecting the far vertex of the first hook 471 and the near vertex of the second hook 472 is parallel to the axis of the net cover 4, or the angle between the line connecting the two hooks and the axis of the net cover 4 is less than or equal to 45°.

[0048] The states in which the first hook 471 and the second hook 472 are hooked together include at least a first hook state and a second hook state. The first hook state is: in the naturally unfolded state, the first hook 471 and the second hook 472 are hooked together, and there is a hook gap L0 (i.e., a certain distance) between the troughs 4711 of the first hook 471 and the crests 4721 of the second hook 472. Therefore, the first hook 471 can move towards the near end or the far end, and the second hook 472 can also move towards the near end or the far end. However, the hook gap L0 restricts the movement of the first hook 471 towards the near end and the second hook 472 towards the far end. The distance the end moves; it is understood that the hook gap can also form a mesh structure for the bridging bracket to use as an entry mesh when necessary; the second hook state is: in the naturally unfolded state, the first hook 471 and the second hook 472 hook each other, and form an abutment at the trough 4711 of the first hook 471 and the peak 4721 of the second hook 472 (the hook gap L0 is 0), so there is a constraint on the movement of the first hook 471 to the near end and the movement of the second hook 472 to the far end.

[0049] Please see Figure 2 The mesh cover 4, in the axial direction from the proximal end to the distal end, includes the proximal cover 43 and the distal cover 45. Please also refer to... Figure 6 , Figure 9 and Figure 11When the first hook 471 hooks with the second hook 472 to form a hook unit 47, the hook unit 47 in the proximal end cover 43 is different from the hook unit 47 in the distal end cover 45. In the proximal end cover 43, the first wave rod 4712 on the side near the radial edge of the mesh cover 4 in the same hook unit 47 crosses over the second wave rod 4722; and / or, in the distal end cover 45, the second wave rod 4722 on the side near the radial edge of the mesh cover 4 in the same hook unit 47 crosses over the first wave rod 4712. See here. Figure 2 The upper part of the unfolded structure refers to the side further away from the inner cavity of the main stent 10, which can also be understood as the outer side of the arched structure of the mesh cover 4. The reason for this arrangement is that the bridging stent usually enters the groove 5 from the mesh on the proximal end 43 and then connects to the branch stent 6 located in the proximal segment 2. Since the first wave rod 4712 on the radial edge of the mesh cover 4 in the same hook unit 47 crosses over the second wave rod 4722 in the proximal end cover 43, the first wave rod 4712 can be separated from the second wave rod 4722 located below it in the radial direction of the lumen stent 100, thus having better upward deformation capability and space. This allows the mesh on the radial side of the proximal end cover 43 to undergo greater deformation under external force, so as to expand large enough to facilitate the guide wire and bridging stent to pass through the mesh. When the external force is removed, the mesh can retract to provide a certain support and limit for the bridging stent, reducing the occurrence of the bridging stent swinging with blood or heartbeat, so as to ensure the stability of branch blood supply. Conversely, if the second wave rod 4722 crosses over the first wave rod 4712 at this position, the first wave rod 4712 will be restricted by the second wave rod 4722 above it, making it difficult to lift further. As a result, the first hook 471 and the second hook 472 will be twisted together at the hook position, which is not conducive to the expansion and deformation of the mesh opening, thus affecting the entry of the bridging bracket.

[0050] In the distal end cover 45, the second wave rod 4722 in the same hook unit 47, near the radial edge of the mesh cover 4, crosses over the first wave rod 4712; the principle and effect of this structure are similar to those of the proximal end cover 43, and will not be repeated here.

[0051] It is understood that in order to make the mesh holes on the radial side of the mesh cover 4 easy to expand and deform, it is not required that the structure of the first mesh region 41 be the same as that described in this embodiment. In other embodiments, the structure of the first mesh region 41 may be similar to that of the second mesh region 42 in this embodiment, including at least one row of hook units 47, or the structure of the first mesh region 41 may be any other suitable structure.

[0052] Please see Figure 2 , Figure 4Furthermore, in one embodiment, the first wave rod 4712 and the second wave rod 4722 of the hook unit 47 near the radial edge of the mesh cover 4 form an axial gap, and the maximum axial length of the axial gap formed by the same row of hook units 47 can be equal or unequal. Exemplarily, in this embodiment, the maximum axial length of the axial gap formed by the same row of hook units 47 is unequal. For example, the multiple axial gaps formed between the multiple hook units 47 include end gaps and intermediate gaps, with the end gaps being closer to the axial ends of the mesh cover 4 than the intermediate gaps, and the maximum axial length of at least one end gap ( Figure 2 The L1 shown is greater than the maximum axial length of the intermediate interval ( Figure 2 As shown in L2), for example, the maximum axial length of the end spacing near the proximal end of the mesh cover 4 is greater than the maximum axial length of the intermediate spacing, and the maximum axial length of the end spacing near the distal end of the mesh cover 4 is greater than the maximum axial length of the intermediate spacing. In other embodiments, if the branch support 6 is provided only near one axial end of the mesh cover 4, then it is sufficient that the maximum axial length of the end spacing near that axial end is greater than the maximum axial length of the intermediate spacing. The axial end of the mesh cover 4 is opposite to the edge of the branch support 6, so the bridging support is more likely to enter the branch support 6 from the mesh near the axial end of the mesh cover 4. By setting the maximum axial length L1 of the end spacing to be greater than the maximum axial length L2 of the intermediate spacing, the size of the side mesh of the mesh cover 4 near its axial end is further increased, which facilitates the entry of the guide wire and the bridging support. Understandably, to achieve easy expansion and deformation of the mesh openings on the radial side of the cover 4, it is not necessarily required that the maximum axial length L1 of the end spacing be greater than the maximum axial length L2 of the middle spacing. The maximum axial length L1 of the end spacing can be approximately equal to the maximum axial length L2 of the middle spacing. As long as the first wave rod 4712 of the same hook unit 47 near the radial edge of the cover 4 crosses over the second wave rod 4722 in the near end cover 43; and / or the second wave rod 4722 of the same hook unit 47 near the radial edge of the cover 4 crosses over the first wave rod 4712 in the far end cover 45, the effect of easy expansion and deformation of the mesh openings on the radial side of the cover 4 can be achieved.

[0053] Furthermore, the mesh cover 4 in this embodiment also includes at least one row of side connectors 46 disposed on the radial side of the mesh cover 4. Each row of side connectors 46 includes at least one side connector 46, and the mesh cover 4 is connected to the main support 10 through the side connectors 46. Exemplarily, the side connectors 46 include connecting holes 46a, through which the mesh cover 4 and the main support 10 can be sewn together. In other embodiments, they can also be fixedly connected by adhesive or other methods.

[0054] Reference Figure 2All side connectors 46 are connected to hook units 47. For example, side connectors 46 are connected to two axially adjacent hook units 47 respectively. In the adjacent hook units 47, the second wave rod 4722 in the second hook member 472 of the hook unit 47 closer to the proximal end of the lumen support 100 continues to extend and bend to form a connecting hole, and then connects to the first wave rod 4712 of the first hook member 471 of the hook unit 47 closer to the distal end of the lumen support 100. The first wave rod 4712 and the second wave rod 4722 are both wave rods in the hook unit 47 closer to the radial side of the mesh cover 4. The connecting hole can be used to fix the connection to the membrane or the support body by sewing. The connecting hole not only facilitates the sewing operation, but also plays a limiting role to prevent the relative slippage between the suture and the mesh cover 4. In this embodiment, the connecting hole is a closed hole, which is beneficial to further improve the limiting effect. In other embodiments, the connecting hole can be an open hole.

[0055] For example, refer to Figure 4 , Figure 5 In this embodiment, the side connector 46 is roughly triangular, including two waists 461 and a base 462 connecting the two waists 461. The base 462 extends roughly along the axial direction and connects to the radial edge of the groove 5. One waist 461 is formed by extending a first wave rod 4712 of the first hook 471, and the other waist 461 is formed by extending a second wave rod 4722 of the second hook 472 that is adjacent to but not hooked to the first hook 471. The two waists 461 of the side connector 46 meet to form a vertex. At the vertex, the two waists 461 overlap and fix each other, for example, by sewing. This connection method can make the radial sides of the mesh cover 4 have better stability, thereby ensuring the overall support force of the mesh cover 4 after connection. In another embodiment, when the side connector 46 is connected to the radial sides of the groove 5 by stitching or bonding, the bottom edge 462 is connected to the edge of the groove 5, and the two waists 461 can slide relative to each other at the intersection, which is beneficial to further increase the expansion size of the mesh holes on the side of the mesh cover 4.

[0056] In other embodiments, the side connector 46 can be of other shapes. For example, the side connector 46 includes a wave that protrudes radially toward the mesh cover 4, sharing a wave rod with both the first hook 471 and the second hook 472. A side connector 46 and the first and second hooks 471 connected thereto together form a mesh. The side connector 46 can be fixedly connected to the main support 10 by methods such as sewing or bonding. Because the side connector 46 has a vertex protruding radially toward the mesh cover 4, the connection can be made more secure by fixing it to the edge of the groove 5 at the vertex position. In other embodiments, the side connector 46 can also be any other suitable shape such as teardrop, circle, or ellipse.

[0057] Please see Figure 2 In this embodiment, the mesh cover 4 further includes a side end connector 42a disposed at the axial end of the mesh cover 4. For example, both the distal and proximal ends of the mesh cover 4 are provided with side end connectors 42a, which are used to connect with the edge of the groove 5. The aforementioned side connector 46 is disposed between the side end connector 42a at the distal end of the mesh cover 4 and the side end connector 42a at the proximal end of the mesh cover 4, and the side end connectors 42a and 46 are spaced apart. By providing the side end connector 42a, the mesh cover 4 can better follow the bending deformation of the main support 10 to better fit the blood vessel and provide support for the groove 5. Furthermore, in this embodiment, the side end connector 42a includes an edge bevel 421 that protrudes towards the axial end of the mesh cover 4. This edge bevel 421 connects to the main support 10, for example, by stitching or bonding. Since the apex 4211 of the edge bevel 421 does not form a closed connection hole structure, it not only reduces the sheath size at the corners of the mesh cover 4 but also allows the edge bevel 421 and the adjacent hook unit 47 to form a large polygonal mesh opening. The large size of this polygonal mesh opening facilitates the entry of the guide wire and bridging support through the mesh opening. In other embodiments, the side end connector 42a may be omitted.

[0058] When the maximum axial length of at least one end gap is greater than the maximum axial length of the middle gap, since the side end connector 42a is connected to the hook unit 47, the maximum gap distance between the side end connector 42a and its adjacent side connector 46 is also greater than the maximum gap distance between two adjacent side connectors 46. This is beneficial for increasing the size of the side mesh openings of the mesh cover 4 near its axial end, facilitating the entry of the guide wire and bridging bracket. In other embodiments, the maximum gap distance between the side end connector 42a and its adjacent side connector 46 may also be approximately equal to the maximum gap distance between two adjacent side connectors 46.

[0059] Example 2

[0060] The lumen support 100 in this embodiment is largely the same as that in Embodiment 1, except that the side end connector 42a is connected to the side connector 46.

[0061] Reference Figure 3 The plurality of side connectors 46 include two first side connectors 46a and a second side connector 46b located between the two first side connectors 46a. The second side connector 46b is connected to a first hook 471 and a second hook 472 respectively. The first side connectors 46a are axially connected to the side end connectors 42a and the hook units 47 respectively. For example, the first side connectors 46a near the near end of the mesh cover 4 are axially connected to the side end connectors 42a and the first hooks 471 located near the near end of the mesh cover 4 respectively. For example, in the first hook 471 of the hook unit 47 located at the nearest end, the first wave rod 4712 near the radial edge of the mesh cover 4 continues to extend in the direction near the near end of the mesh cover 4, and then bends in the opposite direction to form the first side connector 46a and then connects with it. A side end connector 42a is connected to the near end of the mesh cover 4; a first side connector 46a near the far end of the mesh cover 4 is axially connected to the side end connector 42a and the second hook 472 located at the far end of the mesh cover 4. For example, in the second hook 472 of the hook unit 47 at the farthest end, the second wave rod 4722 near the radial edge of the mesh cover 4 continues to extend towards the far end of the mesh cover 4, and then bends in the opposite direction to form the first side connector 46a before connecting to the side end connector 42a located at the far end of the mesh cover 4. In this embodiment, the side end connector 42a includes an edge wave angle 421 that protrudes towards the axial end of the mesh cover 4. The edge wave angle 421 and the adjacent hook unit 47 form a polygonal mesh. The size of the polygonal mesh is relatively large, which facilitates the entry of the guide wire and the bridging support through the mesh. Furthermore, since the side end connector 42a is connected to the first side connector 46a in this embodiment, and there is a gap between the first side connector 46a and the vertex 4211 of the edge bevel 421 of the end connector, it not only does not increase the sheath size of the corner of the mesh cover 4, but also ensures that a larger mesh size is formed between the side end connector 42a and the adjacent hook unit 47. It also prevents the edge bevel 421 fixed by sewing from shifting relative to the groove 5 when the mesh cover 4 is pressed or deformed, thus piercing and damaging biological tissue.

[0062] In this embodiment, when the maximum axial length of at least one end gap is greater than the maximum axial length of the middle gap, the maximum gap distance between the first side connector 46a and the adjacent second side connector 46b is also greater than the maximum gap distance between two adjacent second side connectors 46b. This is beneficial for increasing the size of the side mesh openings of the mesh cover 4 near its axial end, facilitating the entry of the guide wire and bridging bracket. In other embodiments, the maximum gap distance between the first side connector 46a and the adjacent second side connector 46b can also be approximately equal to the maximum gap distance between two adjacent second side connectors 46b.

[0063] Example 3

[0064] In this embodiment, please refer to Figure 4 and Figure 6 The structure of the lumen support 100 is largely the same as that in Embodiment 1 and Embodiment 2. The difference is that the trough 4711 of the first hook 471 and the peak 4721 of the second hook 472 in this embodiment both include a crossbar 473, and the two first wave rods 4712 of the first hook 471 are connected by the crossbar 473, and the two second wave rods 4722 of the second hook 472 are connected by the crossbar 473. The crossbar 473 creates a transitional connection distance between two interconnected wave rods, thus ensuring that the resulting hook gap also has a certain distance in the lateral direction. This further enlarges the size of the mesh formed by the hook gap, making the hook gap more suitable as a mesh for bridging stent entry. Another purpose is that, without the crossbar 473, the direct connection between the two wave rods results in a sharper wave angle at the peak 4721 or trough 4711. When the mesh cover 4 bends with the tubular stent, it will lift up on the curved surface. Over long-term use, the wave angle may scratch the inner wall of the blood vessel, causing unnecessary damage.

[0065] The angle formed by the crossbar 473 and the first wave bar 4712 and / or the second wave bar 4722 is an obtuse angle to further increase the size of the mesh formed by the hook gap. The length of the crossbar 473 should be appropriate, ranging from 1 mm to 4 mm. This not only expands the hook gap and protects the inner wall of the blood vessel, but also avoids the problem of excessive radial compression of the mesh cover 4 due to an excessively long crossbar 473.

[0066] For preferred options, please refer to [link / reference]. Figure 9 and Figure 10 The crossbar 473 is a straight bar, which can directly and effectively avoid scratching the blood vessel wall. When using a straight bar, a rounded transition is used when connecting the straight bar with the two wave bars.

[0067] For preferred options, please refer to [link / reference]. Figure 4 and Figure 6The crossbar 473 is an arc-shaped bar, and an arc-shaped bar with a small degree of curvature should be selected. The preferred arc range is 60°~140°.

[0068] Example 4

[0069] Please see Figure 3 , Figure 4 and Figure 8 Based on any one of the embodiments from Embodiment 1 to Embodiment 3, the mesh cover 4 of this embodiment further includes a bending portion 422. The bending portion 422 includes a first rod 4222 and a second rod 4223 connected to each other. A bending angle 4221 is formed between the first rod 4222 and the second rod 4223. The first rod 4222 extends from the bending angle 4221 toward one axial end of the mesh cover 4, and the second rod 4223 extends from the bending angle 4221 toward the other axial end of the mesh cover 4. Since the first rod 4222 and the second rod 4223 of the bend 422 extend towards opposite axial ends of the cover 4, the first rod 4222 and the second rod 4223 can move relative to each other when the cover 4 is subjected to radial compression from the vessel wall and bends to conform to the vessel shape, relative to the straight rod. This allows the bend 422 to bulge away from the groove 5, making it easier for the cover 4 to form an arch in this area, avoiding compression of the space within the groove 5 and facilitating the entry of the guidewire and bridging stent into the groove 5. In particular, when the bend angle 4221 formed by the bend 422 is an obtuse angle, the relative space between the first rod 4222 and the second rod 4223 increases, allowing for more flexible deformation. Furthermore, when the bend 422 bulges away from the groove 5, it avoids forming a sharp structure that could damage the vessel wall.

[0070] In this embodiment, the bending angle 4221 of the bending portion 422 is located near the axial end of the mesh cover 4. For example, the bending angle 4221 is located between the axial end of the mesh cover 4 and the hook unit 47 closest to the axial end. When a branch support 6 is provided near the axial end of the mesh cover 4, the bending portion 422 can form an arched structure that bulges away from the groove 5 after the lumen support 100 is implanted, providing a larger groove 5 space for the branch opening of the branch support 6 towards the groove 5, which facilitates the guide wire and bridging support to enter the branch support 6.

[0071] Furthermore, the bending angle 4221 of the bent portion 422 bends toward the axial end of the mesh cover 4 that is close to it. This arrangement makes the mesh size of its attachment more uniform. In other embodiments, the bending angle 4221 of the bent portion 422 bends toward the axial end of the mesh cover 4 that is far away from it.

[0072] The first rod 4222 of the bent portion 422 extends from the bending angle 4221 toward one axial end of the mesh cover 4, and the second rod 4223 extends from the bending angle 4221 toward the other axial end of the mesh cover 4. Simultaneously, the first rod 4222 of the bent portion 422 extends toward one radial edge of the mesh cover 4, and the second rod 4223 extends toward the other radial edge of the mesh cover 4. The advantage of this arrangement is that both the first rod 4222 and the second rod 4223 extend at an angle relative to the axial and radial directions of the mesh cover 4, allowing the bent portion 422 to better adapt to the radial deformation of the mesh cover 4 and also better adapt to the axial bending deformation of the mesh cover 4.

[0073] The end of the first rod 4222 away from the bending angle 4221 of the bent portion 422 is connected to the edge of the groove 5. This arrangement allows the edge of the groove 5 to provide a certain support force for the first rod 4222. When the groove 5 is subjected to radial force, the end of the first rod 4222 away from the bending angle 4221 can better transmit the radial force, so that the first rod 4222 can more sensitively follow the deformation of the groove 5.

[0074] Exemplarily, in this embodiment, reference is made to Figure 4 and Figure 8 The edge wave angle 421 includes a vertex 4211 and two third wave rods 4212 connected to the vertex. The first rod 4222 serves as one of the third wave rods 4212 of the edge wave angle 421. The other third wave rod 4212 of the edge wave angle 421 extends from its vertex 4211 toward the axial end of the mesh cover 4 away from the vertex 4211. The two third wave rods 4212 form an angle at the vertex 4211 of the edge wave angle 421. The included angle formed at the vertex 4211 of the edge wavy angle 421 should be appropriate. If the included angle is too large, it will cause uneven mesh size on both sides of the first rod 4222, and may also cause the first rod 4222 to extend approximately radially, making it difficult for the lumen stent 100 to retract. If the included angle is too small, it will also cause uneven mesh size on both sides of the first rod 4222, and may make the vertex 4211 of the edge wavy angle 421 easily pierce and injure blood vessels. Therefore, the included angle can be an acute angle, for example, within the range of 30° to 70°. Within this range, not only can the mesh size on both sides of the first rod 4222 be relatively uniform, but the lumen stent 100 can also be easily retracted and has good safety. The edge wavy angle 421 and the corner 52 of the groove 5 (refer to...) Figure 14 For example, the vertex 4211 of the edge wavy angle 421 is connected to the corner of the groove 5, so it can support the corner of the groove 5 to a certain extent, so that the corner of the groove 5 can be fully unfolded and the shape of the opening of the groove 5 can be better maintained.

[0075] The second rod 4223 of the bent portion 422 passes through the first mesh area 41 and connects to the apex of the first hook 471 or the second hook 472 on the opposite side. For example, part of the second rod 4223 serves as a support wire for the first mesh area 41, and part serves as a wave rod for the hook unit. This arrangement allows the apex of the first hook 471 or the second hook 472 to provide a certain support force for the second rod 4223. When the mesh cover 4 of the groove 5 is subjected to radial force, the end of the second rod 4223 away from the bending angle 4221 can better transmit the radial force, allowing the second rod 4223 to more sensitively follow the deformation of the mesh cover 4. In addition, since the second rod 4223 passes through the first mesh area 41 to the opposite side, the first rod 4222 and the second rod 4223 can respectively transmit the compressive force on both radial sides of the mesh cover 4, thereby adapting to deformation and maintaining the space within the groove 5 well.

[0076] In this embodiment, the mesh cover 4 includes four side end connectors 42a and four bends 422. Two side end connectors 42a and two bends 422 are located at the near end of the mesh cover 4. The two side end connectors 42a are connected to two corners of the near end of the groove 5, and the two bends 422 are connected to the two side end connectors 42a respectively. Two side end connectors 42a and two bends 422 are located at the far end of the mesh cover 4. The two side end connectors 42a are connected to two corners of the far end of the groove 5, and the two bends 422 are connected to the two side end connectors 42a respectively. In other embodiments, the number of side end connectors 42a and bends can be selected according to the actual application scenario.

[0077] Example 5

[0078] Reference Figure 3 , Figure 4 This embodiment, based on any one of embodiments one through four, includes a side end connector 42a and a middle end connector 41a connected to the main stent 10. The side end connector 42a is closer to the radial edge of the mesh cover 4 than the middle end connector 41a. Compared to a solution where the middle end connector 41a is not connected to the main stent, since the middle end connector 41a is connected to the main stent 10, it can better guide the mesh cover 4 to bend and deform in accordance with the shape of the blood vessel when the main stent 10 bends. Furthermore, the middle end connector 41a connected to the main stent 10 can provide better support for the axial end of the groove 5, preventing the main stent 10 and the middle end connector 41a from forming an axial gap when the lumen stent 10 bends. This prevents the narrower inner wall of the blood vessel from squeezing the gap and entering the internal space of the groove 5 from the gap, thereby blocking the guidewire and bridging stent from entering the branch stent 6.

[0079] Furthermore, the intermediate end connector 41a located near the proximal end of the mesh cover 4 is closer to the proximal end of the lumen stent 100 than the side end connector 42a located near the proximal end of the mesh cover 4, and / or, the intermediate end connector 41a located at the distal end of the mesh cover 4 is closer to the distal end of the lumen stent 100 than the side end connector 42a located at the distal end of the mesh cover 4. Compared to the scheme where the axial ends of the side end connector 42a and the intermediate end connector 41a are flush, the scheme of this embodiment allows the mesh cover 4 at the location of the intermediate end connector 41a to have a larger axial dimension, so that the mesh cover 4 can form a better arched structure after bending with the main stent 10, which can effectively prevent the axial end of the mesh cover 4 from forming an approximately flat surface when the main stent 10 bends, better maintain the internal space of the groove 5, facilitate the entry of the guide wire and bridging stent into the groove, and avoid excessive compression of the bridging stent after implantation.

[0080] For example, refer to Figure 3 The intermediate end connector 41a includes an intermediate corrugated angle 411, and the side end connector 42a includes an edge corrugated angle 421. The vertex 4112 of the intermediate corrugated angle 411 located near the end of the mesh cover 4 is closer to the proximal end of the lumen support 100 than the vertex 4211 of the edge corrugated angle 421. Similarly, the vertex 4112 of the intermediate corrugated angle 411 located at the distal end of the mesh cover 4 is closer to the distal end of the lumen support 100 than the vertex 4211 of the edge corrugated angle 421. This arrangement is different from the scheme where the vertex 4112 of the intermediate corrugated angle 411 is flush with the vertex 4211 of the edge corrugated angle 421 (see reference...). Figure 2 After the mesh cover 4 is bent, the longer protrusion of the middle corrugation 411 reduces the axial stretch of the edge corrugations 421 on both sides, thus better maintaining the shape and size of the mesh openings in the area where the edge corrugations 421 are located. This facilitates the passage of the guide wire and bridging support through these mesh openings. Furthermore, the middle corrugation 411 provides sufficient stretch length to ensure that the proximal and distal ends of the mesh cover 4 do not stretch and deform excessively toward the inner cavity of the groove 5. This effectively prevents the axial ends of the mesh cover 4 from forming an approximate plane when the main support 10 is bent, instead forming a better arched structure, thereby effectively maintaining the internal space formed between the mesh cover 4 and the groove 5 at the proximal and distal ends.

[0081] In other embodiments, it may be similar Figure 2 The vertex 4112 of the intermediate wave angle 411 is aligned with the vertex 4211 of the edge wave angle 421; or, the vertex 4211 of the edge wave angle 421 is made to be closer to the axial end of the corresponding lumen support 100 than the vertex 4112 of the intermediate wave angle 411.

[0082] In one embodiment, specifically as follows Figure 8 , Figure 11 and Figure 14As shown, the intermediate wave angle 411 includes two fourth wave rods 4113 connected to its vertex 4112. The vertex 4112 of the intermediate wave angle 411 is connected to one axial end of the groove 5, and the two fourth wave rods 4113 extend from the vertex 4112 of the intermediate wave angle 411 toward the other axial end of the groove 5. Further, the vertex 4112 of the intermediate wave angle 411 is axially opposite to the first mesh region 41, and the two fourth wave rods 4113 extend from the vertex 4112 of the intermediate wave angle 411 in a direction away from each other to connect with the second mesh regions 42 on both radially sides of the first mesh region 41, for example, to the hook units 47 on both radially sides of the mesh cover 4. When the main support 10 bulges and bends towards the opening of the groove 5, the intermediate bevel 411 can cause the second mesh area 42 connected to it to bend, and at the same time cause the first mesh area 41 connected to the second mesh area 42 to bend. Since the second mesh area 42 includes multiple hook units 47, when the intermediate bevel 411 connects with the hook units 47, it can cause the mesh of the second mesh area 42 to expand fully when bending, thus making it easier for the guide wire and bridging support to be inserted. At the same time, the hook units 47 can also limit the stretching length of the second mesh area 42 to a certain extent, thereby limiting the stretching length of the first mesh area 41 connected to it, avoiding problems such as the first mesh area 41 stretching too long and causing compression of the internal space of the groove 5 and the shrinkage of the mesh of the first mesh area 41. Therefore, it can better maintain the internal space of the groove 5 and the shape of the mesh of the first mesh area 41, further facilitating the insertion of the guide wire and bridging support.

[0083] like Figure 3 , Figure 4 , Figure 6As shown, the two fourth wave rods 4113 located at the middle wave angle 411 near the end of the net cover 4 extend from the apex 4112 of the middle wave angle 411 in a direction away from each other to form the first wave rods 4712 of the two hook units 47 on both sides of the net cover 4 in the radial direction. The two fourth wave rods 4113 located at the middle wave angle 411 far from the end of the net cover 4 extend from the apex 4112 of the middle wave angle 411 in a direction away from each other to form the second wave rods 4722 of the two hook units 47 on both sides of the net cover 4 in the radial direction. The two fourth wave rods 4113 of the intermediate wave angle 411 can be approximately parallel to the first direction support wire 481 and the second direction support wire 482 of the first mesh region 41, respectively. In other embodiments, the two fourth wave rods 4113 of the intermediate wave angle 411 may not be parallel to the first direction support wire and the second direction support wire of the first mesh region 41. The angle of the intermediate wave angle 411 (that is, the included angle formed by the two fourth wave rods 4113 at the vertex 4112 of the intermediate wave angle 411) should be appropriate. When the angle of the intermediate wave angle 411 is too large and it is connected to the main cover membrane 31 by stitching, the intermediate wave angle 411 may easily slip relative to the main cover membrane 31 in the length direction of its fourth wave rod 4113. When the angle of the intermediate wave angle 411 is too small, the intermediate wave angle 411 is easy to puncture the main cover membrane 31 and damage the blood vessel wall. Therefore, the angle range of the intermediate wave angle 411 can be set to 20°~80°, so that the intermediate wave angle 411 can be stably fixed on the one hand, and can avoid puncturing the main cover membrane 31 and damaging the blood vessel wall on the other hand.

[0084] Furthermore, referring to Figure 8 The mesh cover 4 in this embodiment also includes a bending portion 422 as described in Embodiment 4, and the two fourth wave rods 4113 of the middle wave angle 411 cross over the bending portion 422 respectively. In this embodiment, the two fourth wave rods 4113 of the middle wave angle 411 cross over the second rods 4223 of the two bending portions 422 respectively. In other embodiments, the two fourth wave rods 4113 of the middle wave angle can also cross over the first rods 4222 of the two bending portions 422, as long as it is ensured that the two fourth wave rods 4113 of the middle wave angle 411 cross over the bending portion 422 respectively. The advantage of this arrangement is that when the mesh cover 4 is radially compressed or bent, the bending portion 422 can bulge in a direction away from the groove 5, thereby supporting the fourth wave rods 4113 crossing over it, avoiding the formation of a relatively flat structure due to excessive stretching of the middle wave angle 411 after the tube support 100 is bent. Therefore, the mesh cover 4 can better maintain the internal space of the groove 5 at the axial end, avoiding encroachment on the space near the opening of the branch support 6.

[0085] When the lumen support 100 is in the deployed state, the fourth wave rod 4113 of the intermediate wave angle 411 and the bend 422 can come into contact with each other; or, as Figure 12 and Figure 13As shown, there is a gap 8 in the radial direction of the lumen support 100 between the fourth wave rod 4113 of the intermediate wave angle 411 and the bending part 422. Whether they are in contact or forming a gap 8, the intermediate wave angle 411 can move relative to the bending part 422, thus having better deformation capacity and conformity whether the cover 4 is bent or straight, and can better maintain the internal space formed between the cover 4 and the groove 5. When there is a gap 8 in the radial direction of the lumen support 100 between the fourth wave rod 4113 of the intermediate wave angle 411 and the bending part 422, the formed gap 8 allows the bending part 422 to have more room to move, which is beneficial for the cover 4 to better form an arched structure when it bends away from the groove 5, and is more conducive to the guide wire and bridging support entering the branch support 6.

[0086] In one embodiment, see Figure 12 and Figure 13 The fourth wave rod 4113 of the intermediate wave angle 411 can be an arc-shaped rod 4111, and the arc-shaped rod 4111 is an upwardly convex arched curved structure. Specifically, the upward convexity here is a convexity along the radial direction of the tube support 100 away from the central axis of the tube support 100. The convex arched curved structure can better facilitate the formation of a gap 8 between the intermediate wave angle 411 and the bending part 422. Furthermore, after the mesh cover 4 bends axially with the bending of the main support 10, the axial end of the mesh cover 4 can follow the arc-shaped rod 4111 to form an arched structure, providing stronger support performance. This can better maintain the internal space of the groove 5 at the axial end position and avoid excessive compression of the internal space.

[0087] Please see Figure 14 and Figure 15The main support 10 has a branch support 6 located in the proximal segment 2, which is a double-branch support 61. The double-branch support 61 consists of two single-branch supports 62 connected side by side to the inner wall of the proximal segment 2 of the lumen support 100 by stitching or bonding. The two single-branch supports 62 are usually set as approximately circular branch openings, and a gap 612 is formed between the two branch openings. Thus, when the double-branch support 61 is stitched to the proximal main body membrane of the lumen support 100 at the proximal edge of the groove 5, the gap 612 will form a blank segment of the proximal main body membrane, which is used when the mesh cover 4 is installed into the groove 5. The middle end connector 41a of the mesh cover 4 is connected to the proximal body film at the gap position 612. For example, the vertex 4112 of the middle wave angle 411 extends to the gap position 612, so that the vertex 4112 of the middle wave angle 411 is closer to the proximal end of the lumen support 100 than the proximal edge of the groove 4, and the middle wave angle 411 is connected to the proximal body film at the gap position 612. The advantage of this arrangement is that the branch port 611 of the double branch port support 61 can provide a certain support for the middle wave angle 411, and can prevent the middle wave angle 411 from piercing the body film 31.

[0088] Understandably, the aforementioned intermediate end connector 41a can be connected to the inner or outer wall of the main body film 31. For example, the apex 4112 of the intermediate wave angle 411 and part of the fourth wave rod 4113 extend to the inner wall of the main body film 31 at the gap position 612, that is, the main body film 31 at the gap position 612 covers the outer side of the apex 4112 of the intermediate wave angle 411 and part of the fourth wave rod 4113, and then the apex 4112 of the intermediate wave angle 411 and part of the fourth wave rod 4113 are connected to the inner wall of the main body film 31 by stitching; or, the main body film 31 at the gap position 612 covers the inner side of the apex 4112 of the intermediate wave angle 411 and part of the fourth wave rod 4113, and then the apex 4112 of the intermediate wave angle 411 and part of the fourth wave rod 4113 are connected to the outer wall of the main body film 31 by stitching. When the intermediate end connector 41a is connected to the inner wall of the main body covering 31, it can prevent the intermediate end connector 41a from tilting outward and damaging the inner wall of the blood vessel when the lumen stent 100 deforms, which is beneficial to improving safety performance.

[0089] In other embodiments, the branch support 6 of the main support 10 located in the proximal segment 2 may not be a double-branch support 61, while the branch support 6 of the distal segment 2 may be a double-branch support 61. Thus, the intermediate wave angle 411 located at the distal end of the mesh cover 4 can be connected to the main support 10 in accordance with the above-described connection method. In other embodiments, the connection position and method between the intermediate wave angle 411 and the main support 10 are not limited to this; a suitable connection position and method can be selected according to actual needs.

[0090] Furthermore, the branch openings 611 of the dual-branch bracket 61 are also provided with support members at their edges to better maintain the shape of the branch openings 611. At least a portion of these support members are connected to the main body film 31 and located on both sides of the intermediate end connector 41a to better support the intermediate wave angle 411.

[0091] The above specific embodiments are only some embodiments of the present invention and are not intended to limit the present invention. This specification cannot exhaustively describe all embodiments of the present invention concept, and some features of the different embodiments described above can be substituted for or combined with each other. Those skilled in the art can also make simple substitutions according to actual needs. The concept of the present invention is subject to the claimed protection scope.

Claims

1. A lumen stent, characterized in that, The device includes a main support and a mesh cover connected to the main support. The side of the main support is radially recessed to form a groove. At least a portion of the mesh cover and the bottom of the groove form a radial gap in the radial direction of the lumen support. The mesh cover includes a side end connector and a middle end connector connected to the main support. The side end connector is closer to the radial edge of the mesh cover than the middle end connector. The middle end connector located near the proximal end of the mesh cover is closer to the proximal end of the lumen support than the side end connector located near the proximal end of the mesh cover. And / or, the middle end connector located at the distal end of the mesh cover is closer to the distal end of the lumen support than the side end connector located at the distal end of the mesh cover. The main support also includes a main body film, and the inner wall of the main support is provided with a double branch support. The branch of the double branch support is located near one axial end of the groove, and a gap is formed between the branches of the double branch support. The middle end connector is connected to the main body film at the gap.

2. The lumen stent according to claim 1, characterized in that, The intermediate end connector is connected to the axial edge of the groove, and the side end connector is connected to the axial edge and / or radial edge of the groove.

3. The lumen stent according to claim 1, characterized in that, The intermediate end connector includes an intermediate wave angle, which includes a vertex connected to the axial end of the groove and two wave rods extending from the vertex toward the other axial end of the groove.

4. The lumen stent according to claim 1, characterized in that, The mesh cover has an arc-shaped structure in the circumferential direction of the cavity support, and the mesh cover bulges towards the bottom away from the groove.

5. The lumen stent according to claim 1, characterized in that, The branch edges of the dual-branch bracket are also provided with support members, and at least a portion of the support members at the branch edges are connected to the main body film and located on both sides of the middle end connector.

6. The lumen stent according to claim 1, characterized in that, The mesh cover also includes a bending portion, which includes a first rod and a second rod connected to each other, forming a bending angle between the first rod and the second rod. The first rod extends from the bending angle toward one axial end of the mesh cover, and the second rod extends from the bending angle toward the other axial end of the mesh cover.

7. The lumen stent according to claim 6, characterized in that, The intermediate end connector includes an intermediate wave angle, which includes a vertex and a wave rod connected to the vertex. The wave rod crosses the bend from above the bend.

8. The lumen stent according to claim 7, characterized in that, The wave rod of the intermediate wave angle contacts the bending portion, or there is a gap between the wave rod of the intermediate wave angle and the bending portion in the radial direction of the lumen support.

9. The lumen stent according to claim 3, characterized in that, The mesh cover includes a first mesh area and at least two second mesh areas respectively connected to both sides of the first mesh area; the second mesh area includes at least one row of hook units, and the first mesh area includes multiple rows of cross units.

10. The lumen stent according to claim 9, characterized in that, The vertex of the intermediate wave angle is axially opposite to the first mesh region, and the two wave rods of the intermediate wave angle extend from the vertex of the intermediate wave angle in a direction away from each other to connect with the second mesh regions on both sides of the first mesh region respectively.

11. The lumen stent according to claim 10, characterized in that, The end of the wave rod at the intermediate wave angle that is away from the vertex of the intermediate wave angle is connected to the hook unit of the second mesh area.

12. The lumen stent according to claim 2, characterized in that, The side end connector includes an edge bevel, the edge bevel includes a vertex, and the vertex of the edge bevel is connected to the corner of the groove.

Images