Recess stent and manufacturing method therefor

Abstract

A recess stent and a manufacturing method therefor. The recess stent (100) comprises a main stent (10) and a supporting cover (4), wherein the main stent (10) is tubular and is provided with an inner cavity; the side surface of the main stent (10) is recessed towards the inner cavity to form a recess (5); the recess (5) comprises a recess bottom (51); the supporting cover (4) is connected to the main stent (10), at least part of the supporting cover (4) and the recess bottom (51) form a radial gap in the radial direction of the recess stent (100), and the supporting cover (4) comprises a mesh structure (4a) braided from braiding wires (40); the mesh structure (4a) comprises a plurality of deformable mesh openings, which bring the recess (5) into communication with the outside, and the mesh structure comprises a braiding starting end (B0) and a braiding tail end (E0); and the braiding starting end (B0) is fixed to the braiding tail end (E0) by means of a fixing member (8). By means of the recess stent, the obstruction of the supporting cover to a guide wire or an outer branch stent can be reduced.

Description

Groove bracket and manufacturing method thereof Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a groove bracket and a manufacturing method thereof. Background Art

[0002] Traditional open surgical treatments for vascular diseases such as aortic aneurysms and aortic dissections are associated with significant trauma, high mortality, prolonged operative times, high rates of postoperative complications, and increased surgical difficulty. Minimally invasive interventional procedures for vascular diseases, however, offer advantages such as minimal trauma, enhanced safety, and high effectiveness. Consequently, they have gained recognition from both physicians and patients and have become an important treatment for vascular diseases. Interventional therapy involves the use of a delivery system to implant a vascular stent into the patient's diseased blood vessel. The implanted stent expands to support the narrowed or occluded segment of the vessel or seal the rupture of a dissected vessel, reducing elastic recoil and reshaping of the vessel, maintaining unobstructed blood flow, and preventing vascular stenosis.

[0003] When an aneurysm or dissection is located near a branch vessel in the aorta, a stent with a groove corresponding to the branch vessel can be implanted. This groove ensures that blood in the aorta flows through the groove to the branch vessel. This not only supports the narrowed and occluded segment of the vessel or seals the rupture of the dissection, but also maintains unobstructed blood flow in the branch vessel. For vessels with narrow or tortuous true lumen, a support cap can be placed on the groove. This cap provides better support and prevents the lumen from squeezing the groove and compressing the operating space. However, the placement of the support cap can easily block the guidewire or the external branch stent. Summary of the Invention

[0004] In view of the deficiencies in the above-mentioned technologies, the present invention provides a groove stent and a manufacturing method thereof, which can reduce the obstruction of the support cover to the guide wire or the outer branch stent to a certain extent.

[0005] The present invention provides a groove bracket, comprising:

[0006] The main body bracket is tubular and has an inner cavity, and the side surface of the main body bracket is recessed toward the inner cavity to form a groove, and the groove includes a groove bottom;

[0007] A support cover, wherein the support cover is connected to the main body bracket, and at least a portion of the support cover and the bottom of the groove form a radial gap in the radial direction of the groove bracket, the support cover includes a mesh structure woven from braided wires, the mesh structure includes a plurality of deformable mesh holes, and the mesh holes connect the groove with the outside world; the mesh structure includes a braiding starting end and a braiding tail end, and the braiding starting end and the braiding tail end are fixed to each other by a fixing piece.

[0008] In one embodiment, the fixing member is located at a radial edge and / or an axial edge of the support cover.

[0009] In one embodiment, the groove includes an axial edge and a radial edge, and a corner is formed between the axial edge and the radial edge of the groove. The fixing member includes a first axial end and a second axial end. The first axial end of the fixing member is located at the corner of the groove or near the corner of the groove, and the second axial end of the fixing member is farther away from the corner than the first axial end, and the fixing member is arranged along the radial edge of the groove.

[0010] In one embodiment, the support cover includes an edge wave angle located at the axial end, the edge wave angle includes a vertex, the vertex of the edge wave angle is connected to the edge corner of the groove, and the fixing member is provided on the edge wave angle, and the fixing member is adjacent to the vertex of the edge wave angle or located near the vertex of the edge wave angle.

[0011] In one embodiment, the edge wave corner is connected to a hooking unit, and the hooking unit includes a first hooking member and a second hooking member that are relatively movable in the axial direction.

[0012] In one embodiment, the groove includes a radial edge, the radial edge of the groove has an inner wall, and the fixing member is fixedly connected to the inner wall.

[0013] In one embodiment, the fixing member is sutured to the inner wall by sutures, and the sutures form a plurality of suture fixing points on the outer surface of the fixing member.

[0014] In one embodiment, the fixing member includes a fixed sleeve, the fixed sleeve includes a sleeve inner cavity, the braiding starting end and the braiding tail end are fixed in the sleeve inner cavity, the braiding wire segment adjacent to the braiding starting end is recorded as the first segment, and the braiding wire segment adjacent to the braiding tail end is recorded as the second segment, the first segment includes a first inner segment located in the fixed sleeve and a first outer segment connected to the first inner segment and located outside the fixed sleeve, the second segment includes a second inner segment located in the fixed sleeve and a second outer segment connected to the second inner segment and located outside the fixed sleeve, and the first outer segment and / or the second outer segment are fixedly connected to the inner wall.

[0015] In one embodiment, along the circumference of the groove bracket, the support cover includes a first mesh area and at least two second mesh areas respectively connected to the two sides of the first mesh area; the second mesh area includes a plurality of first-direction support wires arranged at intervals and a plurality of second-direction support wires arranged at intervals, the first-direction support wires and the second-direction support wires overlap with each other to form multiple columns of cross units and multiple columns of deformable meshes, and at least one of the fixing members is arranged in the second mesh area.

[0016] In one embodiment, the groove includes a groove opening, and the axial distance between at least one of the fixing members and the proximal end of the groove opening is smaller than the axial distance between the fixing member and the distal end of the groove opening; or, the axial distance between at least one of the fixing members and the proximal end of the groove opening is larger than the axial distance between the fixing member and the distal end of the groove opening.

[0017] In one embodiment, when the axial distance between the fixing member and the proximal end of the groove opening is smaller than the axial distance between the fixing member and the distal end of the groove opening, the ratio of the axial distance from the fixing member to the proximal end of the groove opening to the axial length of the groove opening is in a range of 5% to 15%; when the axial distance between the fixing member and the proximal end of the groove opening is larger than the axial distance between the fixing member and the distal end of the groove opening, the ratio of the axial distance from the fixing member to the distal end of the groove opening to the axial length of the groove opening is in a range of 5% to 15%.

[0018] In one embodiment, the braiding start end and the braiding tail end are fixed in the fixing member, and the braiding start end and the braiding tail end are arranged relative to each other in the length direction of the braiding wire, and the braiding start end and the braiding tail end are butted or spaced apart.

[0019] In one embodiment, the groove bracket further includes one or more branch brackets connected to the main bracket, and the branch brackets are all arranged inside the main bracket, or at least some of the branch brackets are arranged outside the main bracket.

[0020] The present invention also provides a method for manufacturing a groove bracket, which is characterized by comprising:

[0021] Provide main frame and support cover;

[0022] Connecting the support cover to the main body bracket;

[0023] The method for manufacturing the support cover includes:

[0024] Provide braided wire,

[0025] Weaving the braided wires through multiple paths to form a mesh structure, wherein the mesh structure includes a weaving start end and a weaving end end;

[0026] The braiding starting end and the braiding tail end of the braiding wire are fixed to each other through a fixing piece.

[0027] In one embodiment, the mesh structure is integrally woven from the braided wires, and the mesh structure has only one braiding start end and one braiding end end.

[0028] In one embodiment, the multiple paths include multiple first direction paths and multiple second direction paths, and weaving the braided wires through the multiple paths to form a mesh structure includes:

[0029] Step A: weaving along the first direction path to form a first direction weaving unit;

[0030] Step B: weaving along the second direction path to form a second direction weaving unit;

[0031] Repeat step A and step B alternately until a mesh structure is formed, wherein the first direction braiding units and the second direction braiding units are alternately formed and connected to each other, and at least one intersection is formed between adjacent first direction braiding units and second direction braiding units.

[0032] The present invention also provides a groove bracket, comprising:

[0033] The main body bracket is tubular and has an inner cavity, and the side surface of the main body bracket is recessed toward the inner cavity to form a groove, and the groove includes a groove bottom;

[0034] A support cover is connected to the main body bracket, and at least a portion of the support cover and the bottom of the groove form a radial gap in the radial direction of the groove bracket, and the support cover can connect the groove with the outside world; a protective structure is provided on the surface of part or all of the area of ​​the support cover.

[0035] In one embodiment, the protective structure includes one or more protective layers selected from the group consisting of a metal layer, a polymer layer, a ceramic layer, and a composite material layer, disposed on the surface of the support cover, wherein the composite material layer is made of one or more materials selected from the group consisting of metal, polymer, and ceramic.

[0036] In one embodiment, the support cover includes a mesh structure woven from braided wires, the mesh structure includes a plurality of mesh holes, the mesh structure includes a plurality of overlapping points formed by overlapping braided wires, and at least at some of the overlapping points, a protective structure is provided on the surface of the braided wires; and / or, the mesh holes are deformable mesh holes, and at least part of the inner walls of the mesh holes are provided with the protective structure.

[0037] In one embodiment, the support cover includes a mesh structure, which includes a mesh body and side connectors arranged on the radial sides of the mesh body. The surface of the mesh body is provided with a protective structure, and at least part of the side connector is not provided with a protective structure.

[0038] In one embodiment, the protective structure includes a protective unit, the support cover includes at least one row of hooking units, each of the hooking units includes a first hooking member and a second hooking member that are hooked to each other in sequence from the proximal end to the distal end, and a hooking gap is formed between the trough of the first hooking member and the crest of the second hooking member so that the trough of the first hooking member and the crest of the second hooking member can move relative to each other in the axial direction; the protective unit is provided on at least one of the hooking units.

[0039] In one embodiment, the protection structure includes a first protection unit and / or a second protection unit, the first protection unit is arranged on the side of the trough of the first hooking member facing the hooking gap, and the second protection unit is arranged on the side of the peak of the second hooking member facing the hooking gap.

[0040] In one embodiment, a first protection unit is provided on the side of the trough of the first hooking member facing the hooking gap, and a second protection unit is provided on the side of the crest of the second hooking member facing the hooking gap, the first protection unit and the second protection unit jointly shield part of the hooking gap, and a through hole is formed between the first protection unit and the second protection unit; the trough of the first hooking member and the crest of the second hooking member can move axially away from each other to drive the through hole to expand for the insertion of the outer branch bracket, and in the naturally expanded state, the area of ​​the through hole is smaller than the cross-sectional area of ​​the outer branch bracket.

[0041] In one embodiment, the protection structure includes a protection unit, and the protection unit includes one or more of a sheet structure, a strip structure, and a block structure.

[0042] In one embodiment, at least one of the first protection unit and the second protection unit includes a main body piece and an extension piece, and the main body piece and the extension piece are both sheet-like structures. One end of the main body piece is connected to the hook unit, and the other end extends into the hook gap and is connected to the extension piece. The extension piece has a free end, and the extension piece extends toward the bottom of the groove, and the free end of the extension piece is located between the support cover and the bottom of the groove.

[0043] In one embodiment, at least one of the first protection unit and the second protection unit includes a sheet-like structure, and the sheet-like structure has a movable end, and the movable end includes a thin-walled area, the thickness of the thin-walled area is less than the thickness of other areas of the protection unit, when the outer branch bracket is inserted into the hooking gap from the outside toward the direction close to the groove, at least part of the thin-walled area is deformed relative to other areas of the sheet-like structure and extends toward the direction close to the bottom of the groove.

[0044] In one embodiment, the thin-walled area includes at least one crack-prone strip, which cracks to form a crack when the outer branch bracket is inserted into the hook gap from the outside toward the bottom of the groove, and at least part of the area adjacent to the crack in the thin-walled area is deformed relative to other areas of the sheet structure and extends toward the bottom of the groove.

[0045] In one embodiment, the protective structure includes a first protective unit and a second protective unit, and the first protective unit and the second protective unit jointly cover the hooking gap; or, the protective structure includes a third protective unit, and the third protective unit includes a polymer film, and the polymer film completely covers one or more of the hooking gaps, and the trough of the first hooking unit and / or the crest of the second hooking unit can move relative to each other in the axial direction, and at least a partial area of ​​the support cover is provided with a socket.

[0046] The beneficial effects of the present invention are: compared with the prior art, the support cover of the present invention includes a mesh structure woven from braided wires, and the mesh structure includes a plurality of deformable mesh holes, which can be deformed under the action of external force so that the guide wire and the external branch stent can pass through the mesh holes, thereby reducing the obstruction of the support cover to the guide wire and the external branch stent; in addition, the braiding starting end and the braiding tail end of the mesh structure are fixed to each other by fixing parts, which is not only conducive to the stable connection of the braiding starting end and the braiding tail end, but also can avoid the risk of damage to the mechanical properties of the area near the braiding starting end and the braiding tail end due to welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a schematic diagram of the implantation state of the groove stent of the present invention;

[0048] FIG2 is a schematic structural diagram of a groove bracket according to a first embodiment of the present invention;

[0049] FIG3 is a schematic structural diagram of a groove according to a first embodiment of the present invention;

[0050] FIG4 is a schematic diagram of a support cover deployed according to an embodiment of the present invention;

[0051] FIG5 is a schematic diagram of a support cover deployed according to another embodiment of the present invention;

[0052] FIG6 is a schematic diagram of a protection structure according to an embodiment of the present invention;

[0053] FIG7 is a schematic diagram of a protection structure according to another embodiment of the present invention;

[0054] FIG8 is a three-dimensional structural diagram of a support cover according to an embodiment of the present invention;

[0055] FIG9 is a partial enlarged view of position A in FIG8 ;

[0056] FIG10 is a partial enlarged view of position B in FIG8;

[0057] FIG11 is a partial enlarged view of position C in FIG8 ;

[0058] FIG12 is a partial enlarged view of position D in FIG8 ;

[0059] FIG13 is a schematic structural diagram of a protective structure in another embodiment of the present invention;

[0060] FIG14 is a schematic structural diagram of a protective structure in another embodiment of the present invention;

[0061] FIG15 is a schematic structural diagram of a hook unit according to an embodiment of the present invention;

[0062] FIG16 is a perspective schematic diagram of the proximal end region of a groove according to an embodiment of the present invention;

[0063] FIG17 is a partial enlarged view of position E in FIG16;

[0064] FIG18 is a schematic structural diagram of a protection unit in Embodiment 2 of the present invention;

[0065] FIG19 is a schematic diagram of a truncation at FF in FIG18 ;

[0066] FIG20 is a schematic diagram of the structure of a protection unit in Embodiment 3 of the present invention;

[0067] FIG21 is a schematic structural diagram of a protection unit in a fourth embodiment of the present invention;

[0068] FIG22 is a schematic structural diagram of a protection unit in another embodiment of the present invention;

[0069] FIG23 is a schematic diagram of the position of the fixing member in the support cover in the fifth embodiment of the present invention;

[0070] FIG24 is a schematic diagram of a braiding start end and a braiding terminal end fixed in a fixing member in the fifth embodiment of the present invention;

[0071] FIG25 is a schematic diagram showing the position of a fixing member in a support cover according to another embodiment of the present invention;

[0072] FIG26 is a schematic diagram showing the position of a fixing member in a support cover according to another embodiment of the present invention;

[0073] FIG27 is a schematic diagram of the cooperation between the fixing member and the groove in the fifth embodiment of the present invention;

[0074] FIG28 is a partial enlarged schematic diagram of the area where the fixing member is located in the fifth embodiment of the present invention;

[0075] FIG29 is a partial enlarged schematic diagram of the area where the fixing member is located in FIG28;

[0076] FIG30 is a schematic diagram of a weaving path of a mesh structure in a fifth embodiment of the present invention;

[0077] FIG31 is a schematic structural diagram of a groove bracket according to an embodiment of the present invention;

[0078] FIG32 is a schematic diagram of a partial structure of a groove bracket provided in one embodiment of the present invention;

[0079] FIG33 is a schematic structural diagram of a groove bracket provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0080] To better understand the concept of the present invention, the following detailed description of the embodiments of the present invention is given in conjunction with the accompanying drawings. The following specific embodiments are only some embodiments of the present invention and are not intended to limit the present invention.

[0081] 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.

[0082] 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.

[0083] The "wave ring" (also known as a wave ring) in the present invention is a closed ring structure, and the "wave unit" is an arc-shaped structure. The "wave ring" and "wave unit" are made of metal elastic materials or polymer materials woven or cut. The metal elastic material includes known materials implanted in medical devices or a combination of various biocompatible materials, such as alloys of two or more single metals among cobalt, chromium, nickel, titanium, magnesium, and iron, as well as 316L stainless steel, nickel-titanium-tantalum alloy, nitrided iron, iron-manganese alloy, sulfided iron, carburized iron, etc., or other metal elastic materials with biocompatibility. The metal elastic material can be a non-degradable material or a degradable material. The polymer material includes polylactic acid, polyglycolic acid, polysuccinate, poly(β-hydroxybutyrate), polycaprolactone, polyadipate, ethylene glycol ester, polylactic acid-glycolic acid copolymer, polyhydroxybutyrate valerate copolymer, polyhydroxyalkyl alcohol ester, poly(β-malate) and a blend of one or more thereof or a copolymer of at least two monomers. It can also be a biocompatible material such as starch, cellulose, polysaccharide, chitin, chitosan or its derivatives. The "wave ring" and "wave unit" both have the ability to expand radially and can achieve radial contraction under the action of external force. After the external force is removed, they can self-expand or mechanically expand (for example, by balloon expansion) to restore to their original shape and maintain their original shape. Therefore, after implantation into the lumen, they can cling to the inner wall of the lumen through their radial supporting force. The waveform of the wave in the "wave ring" and "wave unit" is not limited and includes Z-shaped wave, M-shaped wave, V-shaped wave, sine wave, etc. A wave loop or waveform unit consists of multiple crests (also known as proximal vertices), multiple troughs (also known as distal vertices), and rods connecting adjacent crests and troughs. A vertex (either proximal or distal) and the two rods connecting it form a wave.

[0084] The "membrane" in the present invention can isolate liquids to a certain extent, and can be made of a polymer material with good biocompatibility, such as polytetrafluoroethylene (PTFE) and polyethylene terephthalate (PET).

[0085] Example 1

[0086] Please refer to Figure 1. The groove stent 100 of this embodiment is used to be implanted in a target cavity. The above-mentioned target cavity can be any cavity in a biological body, and the present invention does not limit the type of the target cavity. For ease of understanding, the present invention takes the aortic arch 500 as an example of the target cavity. Referring to Figure 1, the aortic arch 500 is connected to three branch blood vessels 200. The branch blood vessels 200 are connected to the large bend side of the aortic arch 500. Blood flows from the aortic arch 500 to the branch blood vessels 200. An aneurysm 400 is formed on the small bend side of the aortic arch 500 (for example only. In other cases, the aneurysm 400 may be distributed in other positions of the aortic arch 500). By implanting the groove stent 100 in the aortic arch 500 to isolate the aneurysm 400, the blood flowing in the groove stent 100 cannot contact the aneurysm 400, thereby ultimately achieving the purpose of treating the aneurysm 400. The three branch vessels 200 may also be implanted with outer branch stents 300 , which are connected to the groove stent 100 . The blood in the groove stent 100 enters the branch vessels 200 through the outer branch stent 300 .

[0087] Please refer to FIG. 2 and FIG. 3 . The groove bracket 100 of this embodiment includes a main bracket 10 and a support cover 4 connected to the main bracket 10 .

[0088] The main stent 10 is a hollow tubular structure with openings at both ends. Its side surface is recessed toward its inner cavity to form a groove 5. The groove 5 includes a groove bottom 51 and a groove opening 52. The groove opening 52 and the groove bottom 51 are arranged opposite each other in the radial direction of the groove stent 100, and the groove opening 52 faces the radial outside of the groove stent 100. The support cover 4 is connected to the groove 5, and at least a portion of the support cover 4 and the groove bottom 51 form a radial gap in the radial direction of the groove stent 100. The radial gap is connected to the inner cavity of the main stent 10. In this embodiment, the central angle corresponding to the projection of the support cover 4 on the radial plane of the groove stent 100 can be less than or equal to 180 degrees, for example, 120 degrees, so that the support cover 4 has good radial support force and ensures that there is sufficient space in the inner cavity of the main stent 10 for blood to flow through. In other embodiments, the middle section 7 can be recessed as a whole, and the support cover 4 is tubularly sleeved outside the middle section 7.

[0089] Exemplarily, the main body bracket 10 includes a main body support portion and a main body coating 31. The main body coating 31 can be set on the inner surface and / or outer surface of the main body support portion. For example, the main body coating 31 can be set only on the outer surface of the main body support portion. The main body coating 31 can be set on part or all of the inner surface of the main body support portion, and the main body coating 31 can be set on part or all of the outer surface.

[0090] Referring to Figure 2, the main stent 10 can be divided axially into a proximal section 2, a distal section 1, and an intermediate section 7 located between the proximal section 2 and the distal section 1. The proximal section 2 includes a tubular proximal support portion and a proximal main body coating, which can be applied to the inner and / or outer surfaces of the proximal support portion by suturing, bonding, hot-melting, or the like. The proximal support portion includes a plurality of axially spaced main body coils 101. The distal section 1 includes a tubular distal support portion and a distal main body coating, which includes a plurality of axially spaced main body coils 101. The distal main body coating can be applied to the inner and / or outer surfaces of the distal support portion by suturing, bonding, hot-melting, or the like.

[0091] The middle section 7 includes an intermediate main body coating and an intermediate support portion 7a (which may be omitted in other embodiments). The inner cavity enclosed by the intermediate main body coating 31 is connected to the inner cavity enclosed by the proximal main body coating and the inner cavity enclosed by the distal main body coating. The intermediate support portion 7a includes a plurality of arc-shaped corrugated units arranged at intervals in the axial direction, and the openings of the arc-shaped corrugated units are facing the direction of the groove 5. Among them, the main body support 10 is recessed on the side of the middle section 7 toward the inner cavity close to the main body support 10 to form a groove 5, and the projection of the edge of the groove 5 on the plane passing through its radial side edges is roughly rectangular (it can also be said that the opening of the groove 5 is roughly rectangular). In other embodiments, the groove 5 can be of other shapes. Part of the intermediate main body coating serves as the bottom coating of the groove bottom 51, and the groove bottom 51 can also be provided with a bottom support member. The bottom support member can include one or more of a corrugated unit and a mesh structure. It can be understood that the bottom support member can be omitted.

[0092] The radial sides of the support cover 4 are fixedly connected to the intermediate main body coating by suturing, bonding, hot melting, or the like, and a radial gap (or gap, void, or cavity) is formed between at least a portion of the support cover 4 and the outer surface of the groove bottom 51. An inner branch stent 6 may be provided in the proximal segment 2 and / or the distal segment 1. The inner cavity of the inner branch stent 6 communicates with the inner cavity of the main body stent 10 and with the radial gap formed between the groove bottom 51 and the support cover 4. A plurality of inner branch stents 6 may be provided, for example, one inner branch stent 6 may be provided near the proximal end of the groove 5 and another inner branch stent 6 may be provided near the distal end of the groove 5.

[0093] Please refer to Figures 2 and 4. In one embodiment, the support cover 4 is an arc-shaped structure in the circumferential direction of the groove bracket 100. The support cover 4 includes a mesh structure 4a woven by braided wires 40, and the mesh structure 4a includes a mesh body 4b and a side connector 46 arranged on the radial side of the mesh body 4b. The mesh structure 4a is connected to the main bracket 10 (for example, fixedly connected) through the side connector 46. The mesh structure 4a includes a plurality of overlapping points (or intersections) formed by overlapping (or crossing) braided wires 40. At the overlapping points, the braided wires 40 can slide relative to each other. The mesh structure 4a also includes a plurality of deformable meshes connected to the outside world to facilitate the insertion of guide wires and external branch brackets 300 therein. The support cover 4 can be formed by weaving a braided wire made of shape memory alloy or other materials into one piece, or it can be woven separately and then spliced ​​together. In other embodiments, the mesh structure 4a of the support cover 4 can also be formed by cutting; or, in other embodiments, the support cover 4 may not include the mesh structure 4a, but may include a hollow structure with through holes, or other structures with through holes, for example, a structure formed by multiple wavy rings arranged at intervals in the axial direction.

[0094] Please also refer to 6. A protective structure 70 is provided on the surface of at least a portion of the support cover 4. For example, a protective structure 70 is provided on the surface of the braided wire 40 of at least a portion of the support cover 4. The protective structure 70 includes one or more protective layers 71 selected from metal layers, polymer layers, ceramic layers, and composite materials. The composite material layer can be made of one or more of metal, polymer, and ceramic. The metal layer can be formed on the surface of the support cover 4 by electroplating, brush plating, physical or chemical deposition, sputtering, spraying, coating, laser deposition, etc. The metal layer can be made of, but not limited to, one or more metal materials such as titanium and its alloys, tantalum and its alloys, zirconium and its alloys, niobium and its alloys, zinc alloys, magnesium alloys, iron and its alloys, tungsten and its alloys, platinum and its alloys, and gold and its alloys. The polymer layer can be formed by coating, spraying, spin coating, melt coating, dipping, etc., by covering the polymer raw material on the surface of the support cover 4 to form a film. Alternatively, the polymer film layer can be wrapped on the surface of the braided wire 40 by sewing, gluing, hot melting, etc., or the polymer layer can be provided on the surface of the braided wire 40 by any other suitable method. The polymer layer can be made of one or more of PTFE, PET, ePTFE (Expanded Polytetrafluoroethylene), FEP (Fluorinated ethylene propylene), L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, polyhydroxy fatty acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone. In other embodiments, the polymer layer can also be made of any other suitable material. For the ceramic layer, any currently known ceramic material that can be used in the human body can be selected. The ceramic layer can be provided on the surface of the support cover 4 by electroplating, coating, spraying, melting or other suitable methods. By providing a protective structure 70 on the surface of the braided wire 40 in at least a part of the support cover 4, it is helpful to reduce the probability of damage to the mechanical properties of the braided wire 40 in at least a part of the support cover 4 due to wear.

[0095] In this embodiment, the surfaces of the braided wires 40 of the mesh body 4b are all provided with a protective structure 70. For example, with reference to FIG7 , during manufacture, the surfaces of the braided wires 40 in the mesh body 4b are all wrapped with a strip 711 (e.g., a PTFE strip). For example, the strip 711 can be spirally wrapped around the surface of the braided wires 40 to completely cover the surface of the braided wires 40 in the mesh body 4b. Next, the support cover 4 with the strip 711 wrapped around it is heat-treated so that the strip 711 is heat-fused to the surface of the braided wires 40. In other embodiments, a bioceramic layer can be electroplated on the surface of the braided wires 40 in the mesh body 4b as the protective structure 70. In other embodiments, the protective structure 70 can be made of other materials, and the protective layer 71 can be provided in any other suitable manner.

[0096] This arrangement allows the protective structure 70 to be provided at the intersection points of all the braided wires 40 in the mesh body 4b and on the inner walls of all the meshes. This not only reduces the risk of damage to the braided wires 40 at the intersection points where they are more prone to mutual friction, but also helps protect the mesh and the outer branch stents 300 inserted therein, and can reduce to a certain extent the risk of damage to the mesh or the outer branch stent 300 caused by friction between the mesh and the outer branch stent 300 inserted therein. In other embodiments, the mesh body 4b may be only partially provided with the protective structure 70, for example, only at the intersection points of some or all of the braided wires 40, the surface of the braided wire 40 is provided with the protective structure 70, while the inner walls of the mesh are not provided with the protective structure 70; or, only at the inner walls of some or all of the meshes are provided with the protective structure 70, while the overlapping points of the braided wires 40 are not provided with the protective structure 70; or, only at the overlapping points of some of the braided wires 40, the surface of the braided wire 40 is provided with the protective structure 70, while the inner walls of some of the meshes are provided with the protective structure 70.

[0097] In this embodiment, the protective structure 70 is not provided on part or all of the side connector 46 of the support cover 4. For example, the side connector 46 is fixedly connected to the main frame 10, for example, by being sewn to the main covering 31 of the main frame 10. Therefore, the relative position between the side connector 46 and the main frame 10 is relatively fixed, with less relative movement and a low probability of relative friction. Therefore, the protective structure 70 may not be provided on at least part of the side connector 46. In addition, if a protective structure 70 having a surface smoothness higher than that of a bare side connector 46 is provided on the surface of the side connector 46, and the side connector 46 is sewn to the main frame 10, relative slippage between the side connector 46 and the main frame 10 may easily occur, thereby causing relative displacement between the support cover 4 and the main frame 10. Therefore, not providing the protective structure 70 on the side connector 46 also helps reduce the probability of relative displacement between the support cover 4 and the main frame 10. Furthermore, there is a step between the bare area on the side connector 46 and the area on the adjacent surface where the protective structure 70 is provided, which can play a certain limiting role on the stitches used to sew the side connector 46 and the main frame 10, thereby helping to further reduce the probability of relative displacement between the support cover 4 and the main frame 10.

[0098] For example, referring to Figures 8 and 9, in this embodiment, the side connector 46 is roughly triangular in shape, including two waists 461, a bottom edge 462 connecting the two waists 461, and a connection hole 46a formed by the waist 461 and the bottom edge 462. The connection hole 46a can be used as a suture hole for fixed connection with the covering or the support body 10 by suturing. The connection hole 46a not only facilitates the suturing operation, but also plays a limiting role, reducing the relative slippage between the suture and the support cover 4. In this embodiment, the connection hole 46a is a closed hole (or closed loop), which is conducive to further improving the limiting effect. In other embodiments, the connection hole 46a can be an open hole. In other embodiments, the connection hole 46a can also not be used as a suture hole, and the side connector 46 can also be connected to the main support 10 by bonding, hot melting, etc.

[0099] The bottom edge 462 of the side connector 46 extends roughly in the axial direction and is connected to the radial edge of the groove 5. The intersection of the two waists 461 of the side connector 46 forms a vertex, and at this vertex position, the two waists 461 overlap each other. Among them, the bottom edge 462 can be connected to the edge of the groove 5 by sewing or bonding, and the overlapping part of the two waists 461 can slide relative to each other, which is conducive to further increasing the expansion size of the side mesh of the support cover 4. A protective structure 70 can be provided at the overlapping part of the two waists 461 to reduce the risk of damage due to mutual friction at the overlapping part of the two waists 461. In other embodiments, the overlapping part of the two waists 461 can be fixed to each other, for example, by sutures. This connection method can make the radial sides of the support cover 4 have better stability, thereby ensuring the overall support force of the support cover 4 after connection, and at the same time reducing the risk of damage due to mutual friction at the overlapping part of the two waists 461. In another embodiment, the protective structure 70 can be provided on the surfaces of both waists 461, while the protective structure 70 is not provided on the bottom edge 462. The bottom edge 462 is sewn to the edge of the groove 5. The two waists 461 provided with the protective structure 70 can better confine the stitching to the bottom edge 462, thereby better reducing the probability of large relative displacement between the side connector 46 and the main frame 10. In other embodiments, the side connector 46 can have other shapes, for example, the side connector 46 can also be in a teardrop shape, a circle, an oval, or any other suitable shape.

[0100] The support cover 4 of the present invention may have various structures, and those skilled in the art may select one according to the actual application scenario. The structure of the support cover is described below with examples.

[0101] Referring to Figure 4 , the support cover 4 includes a first mesh region 41, which includes at least one row of hooking units 47. Each row of hooking units 47 comprises a plurality of hooking units 47 arranged axially in sequence. Each hooking unit 47 includes a first hooking member 471 and a second hooking member 472, both of which are formed by bending a braided wire 40. The first hooking member 471 comprises a distally bulging wave, namely, a wave trough 4711 (also known as the distal apex) and two first wave rods 4712 connected to the wave trough 4711. The second hooking member 472 comprises a proximally bulging wave, namely, a wave crest 4721 (also known as the proximal apex) and two second wave rods 4722 connected to the wave crest 4721. In this embodiment, the first hooking member 471 and the second hooking member 472 of each hooking unit 47 are generally axially interlocked. It should be noted that "approximately along the axial direction" here means that the line between the distal vertex of the first hook 471 and the proximal vertex of the second hook 472 is approximately parallel to the axis of the support cover 4, or the angle between the line and the axis of the support cover 4 is less than or equal to 45°.

[0102] In the naturally unfolded state, the first hook member 471 and the second hook member 472 are hooked with each other, and there is a hook gap G between the trough 4711 of the first hook member 471 and the crest 4721 of the second hook member 472 (i.e., a certain distance apart), so the first hook member 471 can move in the proximal or distal direction, and the second hook member 472 can also move in the proximal or distal direction, but the hook gap G limits the distance that the first hook member 471 moves proximally and the second hook member 472 moves distally; it can be understood that the hook gap G can serve as the mesh of the mesh structure 4a, which can be expanded under the action of external force to allow the guide wire or the outer branch stent 300 to be inserted therein.

[0103] 4 and 13 , in this embodiment, the protective structure 70 further includes a protective unit 72 . The protective unit 72 is provided on at least one hooking unit 47 . The protective unit 72 can be fixedly connected to the hooking unit 47 by suturing, gluing, hot melting, or the like. Since the area of ​​the hooking gap G is smaller than the area of ​​other meshes (mesh types other than the hooking gap G) in the mesh structure 4a , if a guidewire is inserted through the hooking gap G and guides the external branch stent 300 therein, the inserted external branch stent 300 may be subjected to a greater extrusion force from the hooking gap G, and the friction between the two may be greater. Providing the protective unit 72 on the inner wall of the hooking gap G helps reduce the probability of damage to the external branch stent 300 due to extrusion and friction. It is understood that in other embodiments, only the protective unit 72 may be provided without the protective layer 71 , or only the protective layer 71 may be provided without the protective unit 72 .

[0104] Exemplarily, the protective structure 70 further includes a first protective unit 721 and a second protective unit 722. The first protective unit 721 is provided on the side of the trough 4711 of the first hooking member 471 facing the hooking gap G, and the second protective unit 722 is provided on the side of the crest 4721 of the second hooking member 472 facing the hooking gap G. The first protective unit 721 and the second protective unit 722 can jointly shield at least a portion of the hooking gap G, thereby reducing the probability of the guidewire passing through the hooking gap G and guiding the outer branch stent 300 to be inserted from the hooking gap G. Even if the outer branch stent 300 is inserted from the hooking gap G and plugged with the corresponding inner branch stent 6, during subsequent use, the first protective unit 721 and the second protective unit 722 can still well protect the hooking unit 47 and the outer branch stent 300, and can improve the endothelialization process of the support cover 4, thereby reducing the risk of damage to the outer branch stent 300 caused by friction and cutting force between the two. When the first protection unit 721 and the second protection unit 722 only partially cover the hooking gap G, a through hole 723a can be formed between the first protection unit 721 and the second protection unit 722. The trough 4711 of the first hooking member 471 and the crest 4721 of the second hooking member 472 can move axially away from each other to expand the through hole for insertion of the outer branch stent 300. In the naturally deployed state, the area of ​​the through hole 723a is smaller than the cross-sectional area of ​​the outer branch stent 300. In other embodiments, the first protection unit 721 and the second protection unit 722 can completely cover the hooking gap G, for example, by abutting adjacent edges of the first protection unit 721 and the second protection unit 722, or by overlapping the first protection unit 721 and the second protection unit 722, thereby completely blocking the hooking gap G to prevent the guidewire and the outer branch stent 300 from being inserted into the hooking gap G.

[0105] The first and second protective units 721 and 722, respectively, include one or more sheet-like structures, strip-like structures, and block-like structures. Referring to FIG13 , in this embodiment, the first and second protective units 721 and 722 each include a sheet-like structure. The sheet-like structure can be made of one or more polymer materials selected from the group consisting of PTFE, PET, ePTFE, FEP, L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic-co-glycolic acid, polyhydroxyalkanoate, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid, and polydioxanone. For example, the first protective unit 721 includes a first sheet-like structure 7211, and the second protective unit 722 includes a second sheet-like structure 7221. Together, the first and second sheet-like structures 7211 and 7221 shield at least a portion of the hooking gap G. One end of the first sheet structure 7211 is fixedly connected to the trough 4711 of the first hook member 471 and the area of ​​the two first wave rods 4712 close to the trough 4711, and the other end extends toward the direction close to the second hook member 472; one end of the second sheet structure 7221 is fixedly connected to the crest 4721 of the second hook member 472 and the area of ​​the two second wave rods 4722 close to the crest 4721, and the other end extends toward the direction close to the first hook member 471. The sheet structure described above facilitates better shielding of the hooking gap G, thereby reducing the probability of the external branch stent 300 being inserted into the hooking gap G. Furthermore, the sheet structure can, to a certain extent, prevent the external branch stent 300 inserted into the hooking gap G from being squeezed into the narrow space near the trough 4711 of the first hooking member 471 and the crest 4721 of the second hooking member 472, thereby causing excessive deformation. Furthermore, the sheet structure can provide a good buffer, effectively reducing the risk of damage to the external branch stent 300 caused by friction and cutting forces between the external branch stent 300 and the hooking unit 47. When the sheet structure is made of a degradable material, after the groove stent and the external branch stent 300 are endothelialized, the sheet structure can gradually degrade and be absorbed by the body, thereby providing a larger accommodation space for the inserted external branch stent 300.

[0106] In this embodiment, a through hole 723a is formed between the end of the first sheet structure 7211 farther away from the trough 4711 and the end of the second sheet structure 7221 farther away from the crest 4721. The edge of the end of the first sheet structure 7211 farther away from the trough 4711 is roughly in the shape of an arc bent toward the trough 4711, and the edge of the end of the second sheet structure 7221 farther away from the crest 4721 is roughly in the shape of an arc bent toward the crest 4721, so that the through hole 723a between the first sheet structure 7211 and the second sheet structure 7221 is roughly olive-shaped. The size of the olive-shaped through hole 723a in the radial direction (or transverse direction) of the support cover 4 is larger than the size in the axial direction of the support cover 4. Even if the outer branch stent 300 is inserted therein, the outer branch stent 300 can be restricted to an area with a larger radial size, thereby preventing the outer branch stent 300 from being squeezed into a narrow space near the trough 4711 of the first hook 471 and the crest 4721 of the second hook 472 and causing excessive deformation. In addition, the arcuate edges of the first sheet structure 7211 and the second sheet structure 7221 can provide a guiding effect for the relative movement of the first hook 471 and the second hook 472, thereby preventing the first hook 471 and the second hook 472 from deviating from the hooking position, causing the crest 4721 to tilt and damage the inner wall of the tissue when the groove stent 100 bulges and bends toward the groove 5.

[0107] In this embodiment, the maximum radial dimension and the maximum axial dimension of the through hole 723a are both greater than the diameter of the guidewire, wherein the maximum radial dimension refers to the maximum length of the line connecting the two radial end points of the through hole 723a along the radial direction (or transverse direction) of the groove 5, and the maximum axial dimension refers to the maximum length of the line connecting the two axial end points of the through hole 723a along the axial direction of the groove 5. The guidewire referred to here is the guidewire that guides the outer branch stent 300 into the inner branch stent 6. The advantage of the maximum radial dimension and the maximum axial dimension of the through hole 723a being greater than the diameter of the guidewire is that it provides space for the first hook 471 and the second hook 472 to move relative to each other, so that the support cover 4 has better bending performance. In other embodiments, at least one of the maximum radial dimension and the maximum axial dimension of the through hole 723a is smaller than the diameter of the guidewire. Such a setting is conducive to preventing the guidewire from entering the through hole 723a, thereby reducing the probability of the outer branch stent 300 being inserted therein. In other embodiments, the through hole 723 a may not be formed between the first sheet structure 7211 and the second sheet structure 7221 , but the hooking gap G is completely covered together.

[0108] Referring to Figure 14 , in other embodiments, both the first protection unit 721 and the second protection unit 722 include strip-like structures. For example, the first protection unit 721 includes a first strip-like structure 7212, and the second protection unit 722 includes a second strip-like structure 7222. The first strip-like structure 7212 and the second strip-like structure 7222 jointly shield at least a portion of the hooking gap G and divide the hooking gap G into a plurality of through holes 723a. The first strip-like structure 7212 has two ends in the longitudinal direction connected to the two first wave rods 4712 of the first hooking member 471, and the second strip-like structure 7222 has two ends in the longitudinal direction connected to the two second wave rods 4722 of the second hooking member 472. The first strip-like structure 7212 and the second strip-like structure 7222 may extend substantially parallel to each other or not parallel to each other. The above-mentioned strip structure is beneficial to reducing the probability of the outer branch stent 300 being inserted into the hooking gap G. In addition, the strip structure can, to a certain extent, prevent the outer branch stent 300 inserted into the hooking gap G from being squeezed into the narrow space near the trough 4711 of the first hook part 471 and the crest 4721 of the second hook part 472 and causing excessive deformation, and can better provide buffering. Therefore, it can well reduce the risk of damage to the outer branch stent 300 caused by friction and cutting force between the outer branch stent 300 and the hook unit 47, and the strip structure has less restriction on the relative movement between the first hook part 471 and the second hook part 472, and the first hook part 471 and the second hook part 472 can move relatively flexibly, thereby better maintaining the bending performance of the support cover 4; at the same time, the strip structure is also easier to be radially folded, so that the support cover 4 is easier to be radially compressed, and the size after radial compression will not be too large. When the strip structure is made of a degradable material, after the strip structure degrades and breaks, part of the remaining structure extends into the radial gap between the support cover 4 and the groove 5, which is conducive to accelerating the endothelialization process of the support cover 4 area. After endothelialization, the support cover 4 and the external branch stent 300 can form a relatively integrated structure. Therefore, the risk of damage to the external branch stent 300 caused by friction and cutting force between the external branch stent 300 and the hook unit 47 can be further reduced.

[0109] It is understood that in other embodiments, the first protection unit 721 and the second protection unit 722 may each have different structures. For example, the first protection unit 721 may include a sheet structure, while the second protection unit 722 may include a strip structure, or vice versa. When the first protection unit 721 and the second protection unit 722 can each have different structures, the advantages of multiple structures can be combined. In other embodiments, the number of protection units 72 in the hook gap G may be one, for example, one of the first protection unit 721 and the second protection unit 722 may be omitted. In other embodiments, the number of protection units 72 in the hook gap G may be greater than two.

[0110] Further, referring to FIG15 , in this embodiment, the trough 4711 of the first hook member 471 and the crest 4721 of the second hook member 472 both include a crossbar 473. The two first crests 4712 of the first hook member 471 are connected by the crossbar 473, while the two second crests 4722 of the second hook member 472 are connected by the crossbar 473. The crossbar 473 helps further expand the size of the mesh formed by the hook gap G, thereby making the hook gap G more suitable as a mesh for the external branch stent 300 to enter. Furthermore, in the absence of the crossbar 473, the two crests 4721 or trough 4711 formed by direct connection would have a sharper angle. When the support cap 4 bends with the tubular stent, it would lift off the curved surface. Over long-term use, the angle could scratch the inner wall of the blood vessel, causing unnecessary damage. Therefore, the crossbar 473 reduces the risk of scratching the inner wall of the blood vessel.

[0111] Among them, the angle formed by the cross bar 473 and the first wave bar 4712 and / or the second wave bar 4722 is an obtuse angle, so as to further expand the size of the mesh formed by the hook gap G. The length of the cross bar 473 should be appropriate, and the length range of the cross bar 473 is 1 mm to 4 mm. This not only can expand the area of ​​the hook gap G and protect the inner wall of the blood vessel, but also can avoid the problem of excessive radial compression size of the support cover 4 caused by the cross bar 473 being too long. In this embodiment, the cross bar 473 adopts a straight rod, which can directly and effectively avoid scratching the blood vessel wall. When a straight rod is adopted, an arc transition is adopted when the straight rod is connected to the two wave bars. In other embodiments, the cross bar 473 can also adopt an arc rod, and the curvature of the arc rod is smaller. The preferred curvature range can be 60° to 140°.

[0112] Referring to Figure 4 , in this embodiment, the support cap 4 further includes a second mesh region 42 connected to the first mesh region 41. Both the first mesh region 41 and the second mesh region 42 can radially contract under the action of an external force, and can self-expand or mechanically expand (e.g., via balloon dilation) to restore and maintain their initial shapes after the external force is removed. Preferably, along the circumference of the grooved stent 100, the support cap 4 includes the second mesh region 42 and two first mesh regions 41 respectively connected to the radial sides of the second mesh region 42.

[0113] The second mesh area 42 includes a plurality of first-direction support wires 481 and a plurality of second-direction support wires 482 arranged at intervals. The first-direction support wires 481 and the second-direction support wires 482 are both woven wires 40. The first-direction support wires 481 extend approximately in the first direction, and the second-direction support wires 482 extend approximately in the second direction. The first-direction support wires 481 and the second-direction support wires 482 overlap (or interweave) with each other to form multiple rows of meshes and multiple rows of cross units 48. Each row of meshes includes multiple meshes arranged approximately in the axial direction. Each row of cross units 48 includes multiple cross units 48 arranged approximately in the axial direction. The mesh is roughly diamond-shaped, or can be other shapes such as squares or rectangles; four cross units 48 are correspondingly arranged at the four corners of the mesh. Each cross unit 48 includes an intersection formed by the overlap of the first-direction support wires 481 and the second-direction support wires 482. At this intersection, the first-direction support wires 481 and the second-direction support wires 482 can move relative to each other. Among them, the first direction support wire 481 in some cross units 48 is located on the outside of the second direction support wire 482, and the first direction support wire 481 in some cross units 48 is located on the inside of the second direction support wire 482. In other embodiments, the first direction support wire 481 in the second mesh area 42 is all located on the outside of the second direction support wire 482, or the first direction support wire 481 is all located on the inside of the second direction support wire 482. Since the first direction support wire 481 and the second direction support wire 482 at the intersection of the cross unit 48 overlap with each other and can move relative to each other, the mesh in the second mesh area 42 can be deformed and enlarged under the action of external force to facilitate the guide wire and the outer branch stent 300 to pass through its mesh. When the external force is removed, the mesh can retract to provide certain support and limit for the outer branch stent 300, reducing the occurrence of the outer branch stent 300 swinging with blood or heartbeat, so as to ensure the stability of branch blood supply.

[0114] Referring to Figure 4 , the support cover 4 includes a proximal cover 43 and a distal cover 45 in the axial direction from the proximal end to the distal end. Referring also to Figures 8 to 12 , when the first hooking member 471 and the second hooking member 472 interlock to form a hooking unit 47, the hooking unit 47 in the proximal cover 43 differs from the hooking unit 47 in the distal cover 45. In the proximal cover 43, the first wave rod 4712 of the same hooking unit 47, located near the radial edge of the support cover 4, spans over the second wave rod 4722; and / or, in the distal cover 45, the second wave rod 4722 of the same hooking unit 47, located near the radial edge of the support cover 4, spans over the first wave rod 4712. Among them, the upper part refers to the side that is further away from the inner cavity of the main body bracket 10, and can also be understood as the outer side of the arched structure of the support cover 4; the reason for this arrangement is that if the outer branch bracket 300 enters the groove 5 from the mesh on the proximal cover 43 and then connects with the inner branch bracket 6 located in the proximal section 2, since the first wave rod 4712 on the radial edge side of the support cover 4 in the same hook unit 47 in the proximal cover 43 spans from above the second wave rod 4722, therefore, the first wave rod 4712 can be separated from the second wave rod 4722 located below it in the radial direction of the groove bracket 100, thereby having better upward deformation ability and space, so that the mesh on the radial side of the proximal cover 43 can undergo a large deformation under the action of external force, so as to expand large enough to facilitate the guide wire and the outer branch bracket 300 to pass through the mesh. When the external force is removed, the mesh can retract to provide certain support and limiting effects on the outer branch bracket 300, reducing the occurrence of the outer branch bracket 300 swinging with blood or heart beat, so as to ensure the stability of branch blood supply. On the contrary, if the second wave rod 4722 at this position crosses over the first wave rod 4712, the first wave rod 4712 is restricted by the second wave rod 4722 above it, making it difficult to lift it further, so that the first hook 471 and the second hook 472 will be twisted together at the hooking position, which is not conducive to the expansion and deformation of the network port, thereby affecting the entry of the external branch bracket 300.

[0115] In the distal cover 45, the second wave rod 4722 in the same hook unit 47, which is close to the radial edge of the support cover 4, spans over the first wave rod 4712; the principles and effects of this structure are similar to those of the proximal cover 43 and will not be repeated here.

[0116] It can be understood that in order to achieve easy expansion and deformation of the mesh on the radial side of the support cover 4, the structure of the second mesh area 42 is not required to be the same as that described in this embodiment. In other embodiments, the second mesh area 42 may be similar to the structure of the first mesh area 41 of this embodiment, including at least one row of hooking units 47, or the structure of the second mesh area 42 may be any other suitable structure.

[0117] Referring to Figure 4 , further, in one embodiment, the first wave rod 4712 and the second wave rod 4722 of the hooking unit 47, located near the radial edge of the support cover 4, form an axial interval. The maximum axial lengths of the axial intervals formed by the hooking units 47 in the same row can be equal or different. For example, in this embodiment, the maximum axial lengths of the axial intervals formed by the hooking units 47 in the same row can be different. For example, the multiple axial intervals formed between the multiple hooking units 47 include end intervals and middle intervals. The end intervals are closer to the axial ends of the support cover 4 than the middle intervals. The maximum axial length of at least one end interval (L1 shown in Figure 4) is greater than the maximum axial length of the middle interval (L2 shown in Figure 4). For example, the maximum axial length of the end interval near the proximal end of the support cover 4 is greater than the maximum axial length of the middle interval, and the maximum axial length of the end interval near the distal end of the support cover 4 is greater than the maximum axial length of the middle interval. In other embodiments, if the inner branch support 6 is only provided near one axial end of the support cover 4, it is sufficient that the maximum axial length of the end interval near that axial end is greater than the maximum axial length of the middle interval. The axial end of the support cover 4 is opposite to the edge of the inner branch stent 6, so that the outer branch stent 300 has a higher probability of entering the inner branch stent 6 from the mesh near the axial end of the support cover 4. By setting the maximum axial length L1 of the end interval to be greater than the maximum axial length L2 of the middle interval, the size of the side mesh of the support cover 4 near its axial end is further increased, which facilitates the entry of the guide wire and the outer branch stent 300. It can be understood that in order to achieve the mesh on the radial side of the support cover 4 to be easy to expand and deform, it is not necessarily required that the maximum axial length L1 of the end interval is greater than the maximum axial length L2 of the middle interval. The maximum axial length L1 of the end interval can be roughly equal to the maximum axial length L2 of the middle interval. It is only necessary to set the proximal cover 43 so that the first wave rod 4712 on the radial edge side of the support cover 4 in the same hooking unit 47 passes over the top of the second wave rod 4722; and / or, in the distal cover 45, the second wave rod 4722 on the radial edge side of the support cover 4 in the same hooking unit 47 passes over the top of the first wave rod 4712, so as to achieve the effect of the mesh on the radial side of the support cover 4 to be easy to expand and deform.

[0118] 4 , the side connectors 46 are all connected to the hooking units 47. For example, the side connectors 46 are respectively connected to two axially adjacent hooking units 47. Among the adjacent hooking units 47, the second wave rod 4722 in the second hooking member 472 of the hooking unit 47 closer to the proximal end of the groove bracket 100 continues to extend and bend to form a connecting hole 46a, and then connects to the first wave rod 4712 of the first hooking member 471 of the hooking unit 47 closer to the distal end of the groove bracket 100. The first wave rod 4712 and the second wave rod 4722 are both wave rods in the hooking unit 47 closer to the radial side of the support cover 4.

[0119] 4 and 8 , in this embodiment, the support cap 4 further includes side end connectors 42a disposed at axial ends of the support cap 4. For example, the support cap 4 is provided with side end connectors 42a at both the distal and proximal ends. The side end connectors 42a are configured to connect to the edges of the groove 5. The side connectors 46 are disposed between the side end connectors 42a at the distal end of the support cap 4 and the side end connectors 42a at the proximal end of the support cap 4, with the side end connectors 42a and 46 spaced apart. The provision of the side end connectors 42a allows the support cap 4 to better follow the bending and deformation of the main stent 10, thereby better conforming to the blood vessel and providing support for the groove 5. In addition, in this embodiment, the side end connector 42a includes an edge wave angle 421 that rises toward the axial end of the support cover 4. The side end connector 42a is connected to the main support 10 through the edge wave angle 421, for example, by suturing, bonding, etc. Since the vertex 4211 of the edge wave angle 421 does not itself form a closed connection hole structure, it not only reduces the sheath size at the corner of the support cover 4, but also allows the edge wave angle 421 and the adjacent hook unit 47 to form a larger polygonal mesh. The larger polygonal mesh size facilitates the entry of the guidewire and the external branch stent 300 through the mesh. In other embodiments, the side end connector 42a can be omitted.

[0120] When the maximum axial length of at least one end interval is greater than the maximum axial length of the middle interval, since the side end connector 42a is connected to the hook unit 47, the maximum spacing distance between the side end connector 42a and the adjacent side connector 46 is also greater than the maximum spacing distance between two adjacent side connectors 46. This helps to increase the size of the side mesh near the axial end of the support cover 4, facilitating the entry of the guidewire and the outer branch stent 300. In other embodiments, the maximum spacing distance between the side end connector 42a and the adjacent side connector 46 can also be approximately equal to the maximum spacing distance between two adjacent side connectors 46.

[0121] In another embodiment, referring to Figure 5, 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 respectively connected to a first hook 471 and a second hook 472. The first side connector 46a is axially connected to the side end connector 42a and the hook unit 47, respectively. For example, the first side connector 46a near the proximal end of the support cover 4 is axially connected to the side end connector 42a and the first hook 471 located at the proximal end of the support 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 support cover 4 continues to extend toward the direction close to the proximal end of the support cover 4, and then bends in the opposite direction to form the first side connector 46a, and then connects with the side end connector 42a located at the proximal end of the support cover 4. 4 is connected to the side end connector 42a at the proximal end of the support cover 4; the first side connector 46a near the distal end of the support cover 4 is axially connected to the side end connector 42a and the second hook member 472 at the distal end of the support cover 4. For example, in the second hook member 472 of the hook unit 47 at the most distal end, the second wave rod 4722 near the radial edge of the support cover 4 (also refer to Figure 4) continues to extend toward the distal end of the support cover 4, then bends in the opposite direction to form the first side connector 46a, which is then connected to the side end connector 42a at the distal end of the support cover 4. In this embodiment, the side end connector 42a includes an edge wave angle 421 that rises toward the axial end of the support cover 4. The edge wave angle 421 and the adjacent hook unit 47 form a polygonal mesh. The polygonal mesh size is large, which facilitates the entry of the guidewire and the external branch stent 300 through the mesh. Furthermore, since the side end connector 42a of this embodiment is connected to the first side connector 46a, and there is a distance between the first side connector 46a and the vertex 4211 of the edge wave angle 421 of the end connector, not only will the sheathing size of the corners of the support cover 4 not be increased, but a larger mesh size can be formed between the side end connector 42a and the adjacent hook unit 47, and the edge wave angle 421 fixed by suturing can be prevented from shifting relative to the groove 5 and piercing and damaging biological tissue when the support cover 4 is under pressure or deformed.

[0122] In this embodiment, when the maximum axial length of at least one end interval is greater than the maximum axial length of the middle interval, the maximum spacing distance between the first side connector 46a and the adjacent second side connector 46b is also greater than the maximum spacing distance between the two adjacent second side connectors 46b. This helps to increase the size of the side mesh near the axial end of the support cover 4, facilitating the entry of the guidewire and the outer branch stent 300. In other embodiments, the maximum spacing distance between the first side connector 46a and the adjacent second side connector 46b can also be approximately equal to the maximum spacing distance between the two adjacent second side connectors 46b.

[0123] Please refer to Figures 4, 8 and 12. The support cover 4 of this embodiment also 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 a direction close to one axial end of the support cover 4, and the second rod 4223 extends from the bending angle 4221 toward a direction close to the other axial end of the support cover 4. Because the first rod 4222 and the second rod 4223 of the bent portion 422 extend toward opposite axial ends of the support cover 4, respectively, when the support cover 4 is subjected to radial compression from the vessel wall and bends in accordance with the vessel shape, the first rod 4222 and the second rod 4223, forming the bend angle 4221, can move relative to each other, thereby allowing the bent portion 422 to bulge away from the groove 5. The support cover 4 is more likely to form an arch in this area, avoiding compression of the space within the groove 5 and facilitating the guidewire and the outer branch stent 300 to enter the groove 5. In particular, when the bend angle 4221 formed by the bent portion 422 is an obtuse angle, the relative movement space between the first rod 4222 and the second rod 4223 is increased, allowing for more flexible deformation. Furthermore, when the bent portion 422 bulges away from the groove 5, it avoids forming a sharp structure that can damage the vessel wall.

[0124] In this embodiment, the bending angle 4221 of the bending portion 422 is located near the axial end of the support cover 4. For example, the bending angle 4221 is located between the axial end of the support cover 4 and the hook unit 47 closest to the axial end. When an inner branch stent 6 is provided near the axial end of the support cover 4, the bending portion 422 can form an arched structure that bulges in the direction away from the groove 5 after the groove stent 100 is implanted, providing a larger groove 5 space for the branch opening of the inner branch stent 6 toward the groove 5, thereby facilitating the guide wire and the outer branch stent 300 to enter the inner branch stent 6.

[0125] Furthermore, the bending angle 4221 of the bending portion 422 is bent toward the axial end of the support cover 4 to which it is close. This arrangement can make the mesh size of its accessories more uniform. In other embodiments, the bending angle 4221 of the bending portion 422 is bent toward the axial end of the support cover 4 to which it is away.

[0126] The first rod 4222 of the bent portion 422 extends from the bent corner 4221 toward one axial end of the support cover 4, and the second rod 4223 extends from the bent corner 4221 toward the other axial end of the support cover 4. Furthermore, the first rod 4222 of the bent portion 422 extends toward one radial edge of the support cover 4, and the second rod 4223 extends toward the other radial edge of the support cover 4. This arrangement has the advantage that the first rod 4222 and the second rod 4223 both extend obliquely relative to the axial and radial directions of the support cover 4, allowing the bent portion 422 to better adapt to both radial deformation and axial bending deformation of the support cover 4.

[0127] The end of the first rod 4222 of the bent portion 422 away from the bending angle 4221 is connected to the edge of the groove 5. This arrangement allows the edge of the groove 5 to provide a certain supporting 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.

[0128] In this embodiment, referring to Figures 4, 8 and 12, 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, and the other third wave rod 4212 of the edge wave angle 421 extends from its vertex 4211 toward the axial end of the support cover 4 away from the vertex 4211, and is connected to the radial edge of the groove 5, and the two third wave rods 4212 form an angle at the vertex 4211 of the edge wave angle 421. The angle formed at the vertex 4211 of the edge wave angle 421 should be of appropriate size. When the angle is too large, on the one hand, the mesh sizes on both sides of the first rod 4222 will be uneven, and on the other hand, the first rod 4222 may be extended approximately radially, thereby making it difficult for the groove bracket 100 to be sheathed. When the angle is too small, the mesh sizes on both sides of the first rod 4222 will also be uneven, and the vertex 4211 of the edge wave angle 421 may be easily pierced and injure the blood vessel. Therefore, the angle can be an acute angle. For example, the angle range can be 30° to 70°. Within this range, not only can the mesh sizes on both sides of the first rod 4222 be relatively uniform, but the vertex can also make the groove bracket 100 easy to be sheathed, and has good safety. The edge wave angle 421 is connected to the corner 53 of the groove 5 (refer to Figure 16). For example, the vertex 4211 of the edge wave angle 421 is connected to the corner 53 of the groove 5. Therefore, it can support the corner 53 of the groove 5 to a certain extent, so that the corner 53 of the groove 5 can be fully expanded and the shape of the opening of the groove 5 can be better maintained.

[0129] The second rod 4223 of the bent portion 422 passes through the second meshed area 42 and connects to the apex of the first hook 471 or the second hook 472 on the opposite side. For example, a portion of the second rod 4223 serves as a support wire for the second meshed area 42, while a portion 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 amount of support for the second rod 4223. When the support cover 4 of the groove 5 is subjected to radial force, the end of the second rod 4223 away from the bend 4221 can better transmit this radial force, allowing the second rod 4223 to more sensitively follow the deformation of the support cover 4. Furthermore, since the second rod 4223 passes through the second meshed area 42 and reaches the opposite side, the first rod 4222 and the second rod 4223 can respectively transmit the compressive force exerted on the radial sides of the support cover 4, thereby adaptively deforming and effectively maintaining the space within the groove 5.

[0130] In this embodiment, the support cover 4 includes four side end connectors 42a and four bent portions 422, wherein two side end connectors 42a and two bent portions 422 are located at the proximal end of the support cover 4, the two side end connectors 42a are respectively connected to the two corners 53 at the proximal end of the groove 5, and the two bent portions 422 are respectively connected to the two side end connectors 42a; two side end connectors 42a and two bent portions 422 are located at the distal end of the support cover 4, the two side end connectors 42a are respectively connected to the two corners 53 at the distal end of the groove 5, and the two bent portions 422 are respectively connected to the two side end connectors 42a. In other embodiments, the number of side end connectors 42a and bent portions can be selected according to the actual application scenario.

[0131] 5 , in another embodiment, the support cap 4 further includes side end connectors 42a and an intermediate end connector 41a connected to the main stent 10. The side end connectors 42a are closer to the radial edge of the support cap 4 than the intermediate end connector 41a. Compared to a solution in which the intermediate end connector 41a is not connected to the main stent, the intermediate end connector 41a is connected to the main stent 10. Therefore, when the main stent 10 bends, the support cap 4 can be better driven to bend and deform in accordance with the shape of the blood vessel. The intermediate end connector 41a connected to the main stent 10 can also provide better support for the axial ends of the groove 5, thereby preventing the main stent 10 from forming an axial gap between the main stent 10 and the intermediate end connector 41a when the groove stent 10 bends. This prevents the inner wall of the blood vessel with a relatively narrow true lumen from squeezing the gap and entering the internal space of the groove 5 through the gap, thereby blocking the guidewire and the outer branch stent 300 from entering the inner branch stent 6.

[0132] Furthermore, the middle end connector 41a at the proximal end of the support cover 4 is closer to the proximal end of the groove stent 100 than the side end connector 42a at the proximal end of the support cover 4, and / or the middle end connector 41a at the distal end of the support cover 4 is closer to the distal end of the groove stent 100 than the side end connector 42a at the distal end of the support cover 4. Compared with the solution in which the axial ends of the side end connector 42a and the middle end connector 41a are flush, the solution of this embodiment enables the support cover 4 at the position of the middle end connector 41a to have a larger axial dimension, so that the support cover 4 can form a better arched structure after following the bending of the main stent 10, and can effectively prevent the axial end of the support cover 4 from forming a nearly flat surface when the main stent 10 is bent, better maintain the internal space of the groove 5, facilitate the guide wire and the outer branch stent 300 to enter the groove, and avoid excessive squeezing of the outer branch stent 300 after implantation.

[0133] For example, referring to Figures 5 and 16, the middle end connector 41a includes a middle wave angle 411, and the side end connector 42a includes an edge wave angle 421. The apex 4112 of the middle wave angle 411 located at the proximal end of the support cover 4 is closer to the proximal end of the groove bracket 100 than the apex 4211 of the edge wave angle 421, and the apex 4112 of the middle wave angle 411 located at the distal end of the support cover 4 is closer to the distal end of the groove bracket 100 than the apex 4211 of the edge wave angle 421. Compared with the solution in which the apex 4112 of the middle wave angle 411 is flush with the apex 4211 of the edge wave angle 421 (see Figure 4), after the support cover 4 is bent, the middle wave angle 411 protrudes longer, so that the edge wave angles 421 on both sides are less stretched in the axial direction, which can better maintain the shape and size of the mesh in the area where the edge wave angle 421 is located, which is conducive to the guide wire and the outer branch stent 300 passing through these meshes. Furthermore, the middle wave angle 411 provides sufficient stretching length to ensure that the proximal and distal ends of the support cover 4 will not be stretched and deformed too much toward the inner cavity of the groove 5, and can effectively avoid the axial ends of the support cover 4 from forming an approximate plane when the main bracket 10 is bent, but instead form a better arch structure, thereby effectively maintaining the internal space formed by the support cover 4 at the proximal and distal ends and the groove 5.

[0134] In other embodiments, the apex 4112 of the middle wave angle 411 may be flush with the apex 4211 of the edge wave angle 421 as shown in FIG. 4 ; or, the apex 4211 of the edge wave angle 421 may be closer to the corresponding axial end of the groove bracket 100 than the apex 4112 of the middle wave angle 411 .

[0135] In one embodiment, as specifically shown in Figures 5, 16, and 17, the intermediate wave angle 411 includes two fourth wave rods 4113 connected to its apex 4112. The apex 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 apex 4112 of the intermediate wave angle 411 toward the other axial end of the groove 5. Furthermore, the apex 4112 of the intermediate wave angle 411 is axially opposite to the second mesh region 42, and the two fourth wave rods 4113 extend away from each other from the apex 4112 of the intermediate wave angle 411 to respectively connect with the first mesh region 41 on both radial sides of the second mesh region 42, for example, respectively connect with the hook units 47 on both radial sides of the support cover 4. When the main support 10 is convexly bent toward the opening direction of the groove 5, the intermediate wave angle 411 can drive the first mesh area 41 connected thereto to bend, and at the same time drive the second mesh area 42 connected thereto to bend. Since the first mesh area 41 includes a plurality of hook units 47, when the intermediate wave angle 411 is connected to the hook units 47, it can drive the mesh of the first mesh area 41 to fully expand when bending, thereby making it easier for the guide wire and the outer branch stent 300 to penetrate. At the same time, the hook units 47 can also limit the stretching length of the first mesh area 41 to a certain extent, thereby limiting the stretching length of the second mesh area 42 connected thereto, avoiding the problem that the second mesh area 42 is stretched too long and causes the internal space of the groove 5 to be compressed and the mesh of the second mesh area 42 to be too small. Therefore, the internal space of the groove 5 and the shape of the mesh of the second mesh area 42 can be better maintained, further facilitating the penetration of the guide wire and the outer branch stent 300.

[0136] 5 , 16 and 17 , the two fourth wave rods 4113 of the intermediate wave angle 411 at the proximal end of the support cover 4 extend from the apex 4112 of the intermediate wave angle 411 toward directions away from each other to form the first wave rod 4712 of the two hooking units 47 on both radial sides of the support cover 4, and the two fourth wave rods 4113 of the intermediate wave angle 411 at the distal end of the support cover 4 extend from the apex 4112 of the intermediate wave angle 411 toward directions away from each other to form the second wave rod 4722 of the two hooking units 47 on both radial sides of the support cover 4. The two fourth wave rods 4113 of the intermediate wave angle 411 can be roughly parallel to the first direction support wire 481 and the second direction support wire 482 of the second mesh area 42, 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 second mesh area 42. The angle of the intermediate wave angle 411 (that is, the 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 is connected to the main body coating 31 by suturing, the intermediate wave angle 411 may easily slip relative to the main body coating 31 in the length direction of its fourth wave rods 4113. When the angle of the intermediate wave angle 411 is too small, the intermediate wave angle 411 may easily pierce the main body coating 31 and damage the blood vessel wall. Therefore, the angle range of the intermediate wave angle 411 can be set to 20°~80°. On the one hand, the intermediate wave angle 411 is stably fixed, and on the other hand, it can avoid piercing the main body coating 31 and damaging the blood vessel wall.

[0137] 5 and 17 , the two fourth wave rods 4113 of the intermediate wave angle 411 each span over the bent portion 422. In this embodiment, the two fourth wave rods 4113 of the intermediate wave angle 411 each span over the second rods 4223 of the two bent portions 422. In other embodiments, the two fourth wave rods 4113 of the intermediate wave angle may also span over the first rods 4222 of the two bent portions 422, as long as the two fourth wave rods 4113 of the intermediate wave angle 411 each span over the bent portion 422. This arrangement has the advantage that when the support cover 4 is radially compressed or bent, the bent portion 422 can bulge away from the groove 5, thereby supporting the fourth wave rods 4113 spanning over it, thus preventing the intermediate wave angle 411 from being excessively stretched after the groove support 100 is bent, resulting in a relatively flat structure. Consequently, the support 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 inner branch support 6.

[0138] When the groove stent 100 is in the expanded state, the fourth wave rod 4113 of the intermediate wave angle 411 and the bent portion 422 may contact each other; alternatively, a gap may exist between the fourth wave rod 4113 of the intermediate wave angle 411 and the bent portion 422 in the radial direction of the groove stent 100. Regardless of whether they contact each other or form a gap, the intermediate wave angle 411 can move relative to the bent portion 422, thereby having better deformation ability and compliance regardless of whether the support cover 4 is bent or straight, and can better maintain the internal space formed between the support cover 4 and the groove 5. When a gap exists between the fourth wave rod 4113 of the intermediate wave angle 411 and the bent portion 422 in the radial direction of the groove stent 100, the gap formed can provide the bent portion 422 with a larger movable space, which is beneficial for the support cover 4 to better form an arch structure when bending away from the groove 5, and is more conducive to the guide wire and the outer branch stent 300 entering the inner branch stent 6.

[0139] In one embodiment, the fourth wave rod 4113 of the intermediate wave angle 411 can be a curved rod 4111, and the curved rod 4111 is an upwardly protruding arched curved structure. The upward protrusion here specifically protrudes in the radial direction of the groove bracket 100 in a direction away from the central axis of the groove bracket 100. The raised arched curved structure can better facilitate the formation of a gap between the intermediate wave angle 411 and the bent portion 422. Furthermore, after the support cover 4 bends axially with the bending of the main bracket 10, the curved rod 4111 of the arched curved structure can form an arched structure at the axial end of the support cover 4 following the curved rod 4111, providing stronger support performance. This can better maintain the internal space of the groove 5 at the axial end position and prevent the internal space from being excessively squeezed.

[0140] Please refer to Figures 16 and 17. The inner branch stent 6 of the main stent 10 located at the proximal section 2 is a double-branch stent 61, wherein the double-branch stent 61 is two single-branch stents 62 connected side by side to the inner wall of the proximal section 2 of the groove stent 100 by suturing or bonding. The two single-branch stents 62 are usually set as approximately circular branch openings, and a gap position 612 is formed between the two branch openings. When the double-branch stent 61 is sutured to the proximal main body covering of the groove stent 100 at the proximal edge of the groove 5, the gap position 612 forms a blank section of the proximal main body covering for supporting the cover 4. When installed in the groove 5, the middle end connector 41a of the support cover 4 is connected to the proximal main body coating at the gap position 612. For example, the apex 4112 of the intermediate wave angle 411 extends to the gap position 612, so that the apex 4112 of the intermediate wave angle 411 is closer to the proximal end of the groove bracket 100 than the proximal edge of the groove 5, and the intermediate wave angle 411 is connected to the proximal main body coating at the gap position 612. The advantage of this arrangement is that the branch port 611 of the double-branch port bracket 61 can provide a certain degree of support for the intermediate wave angle 411, thereby preventing the intermediate wave angle 411 from piercing the main body coating 31.

[0141] It can be understood that the above-mentioned intermediate end connecting piece 41a can be connected to the inner wall or outer wall of the main body coating 31 (refer to Figure 2), 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 coating 31 at the gap position 612, that is, the main body coating 31 at the gap position 612 covers the outer side of the apex 4112 and part of the fourth wave rod 4113 of the intermediate wave angle 411, and then the apex 4112 and part of the fourth wave rod 4113 of the intermediate wave angle 411 are connected to the inner wall of the main body coating 31 by sewing; or, the main body coating 31 at the gap position 612 covers the inner side of the apex 4112 and part of the fourth wave rod 4113 of the intermediate wave angle 411, and then the apex 4112 and part of the fourth wave rod 4113 of the intermediate wave angle 411 are connected to the outer wall of the main body coating 31 by sewing. When the middle end connector 41a is connected to the inner wall of the main body covering 31, it can prevent the middle end connector 41a from warping outward and damaging the inner wall of the blood vessel when the groove bracket 100 is deformed, which is beneficial to improving safety performance.

[0142] In other embodiments, the inner branch stent 6 of the proximal section 2 of the main stent 10 may not be a double-branch stent 61, while the inner branch stent 6 of the distal section 2 may be a double-branch stent 61. In this case, the intermediate wave angle 411 at the distal end of the support cover 4 can be connected to the main stent 10 in the same manner as described above. In other embodiments, the connection position and connection method between the intermediate wave angle 411 and the main stent 10 are not limited to these, and an appropriate connection position and connection method can be selected according to actual needs.

[0143] Furthermore, a support member is provided at the edge of the branch opening 611 of the double-branch opening bracket 61 to better maintain the shape of the branch opening 611. At least a portion of the support member is connected to the main body covering 31 and is located on both sides of the middle end connecting member 41a to better support the middle wave angle 411.

[0144] Example 2

[0145] The groove bracket 100 of this embodiment is substantially the same as that of the first embodiment, and the similarities are not repeated here. The difference lies in the structure of the protection unit 72 of the groove bracket 100 of this embodiment.

[0146] 18 and 19 , at least one of the first and second protection units 721, 722 of this embodiment includes a main body sheet 723 and an extension sheet 724. Both the main body sheet 723 and the extension sheet 724 are sheet-like structures. One end of the main body sheet 723 is connected to the hook unit 47, and the other end extends into the hook gap G and is connected to the extension sheet 724. The extension sheet 724 has a free end 7241. The extension sheet 724 extends toward the groove bottom 51, and the free end 7241 of the extension sheet 724 is located between the support cover 4 and the groove bottom 51. The provision of the extension sheet 724 helps to increase the contact area between the protection unit 72 and the outer branch bracket 300 inserted therein, thereby better protecting the outer branch bracket 300. In addition, the radial gap between the extension piece 724 and the groove bottom 51 and the support cover 4 will change the hemodynamics of the blood in the groove 5, thereby accelerating the formation of thrombus in a short period of time, so that the thrombus quickly fills the groove 5, thereby sealing the groove 5, which is beneficial to provide support for the implanted external branch stent 300, prevent the external branch stent 300 from twisting and shifting, and is also beneficial to the rapid endothelialization of the groove 5 and the support cover 4 area, further reducing the risk of damage to the external branch stent 300 due to friction and cutting force.

[0147] In this embodiment, the main sheet 723 and the extension sheet 724 can be made of one or more of the following polymer materials: PTFE, PET, ePTFE, FEP, silicone, L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic-co-glycolic acid, polyhydroxyalkanoate, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid, and polydioxanone. Any other suitable material can also be used. The main sheet 723 and the extension sheet 724 can be made of the same material or different materials.

[0148] Furthermore, the extension piece 724 may have a certain guiding function, and may be bent in the direction of the inner branch stent 6 to guide the guide wire to better enter the inner branch stent 6, which is conducive to improving the efficiency and success rate of the operation. For example, the extension piece 724 may be made of silicone material, which has a certain shape stability and can well guide the guide wire to move in the direction of the inner branch stent 6. In another embodiment, the first protection unit 721 and the second protection unit 722 both include an extension piece 724, and the extension pieces 724 of the two are at least partially interconnected to form a guide channel, which bends and extends in the direction of the inner branch stent 6, thereby better guiding and promoting endothelialization.

[0149] Example 3

[0150] The groove bracket 100 of this embodiment is substantially the same as that of the first embodiment, and the similarities are not repeated here. The difference lies in the structure of the protection unit 72 of the groove bracket 100 of this embodiment.

[0151] Referring to Figure 20 , at least one of the first and second protection units 721 and 722 comprises a sheet-like structure having a movable end, at least a portion of which is movable relative to the hook unit 47. The movable end includes a thin-walled region that is thinner than the remaining regions of the protection unit 72. When the outer branch stent 300 is inserted from the outside toward the groove 5 into the hook gap G, at least a portion of the thin-walled region deforms relative to the remaining regions and extends toward the groove bottom 51, thereby forming a structure similar to the extension piece 724 in the second embodiment. This increases the contact area between the protection unit 72 and the inserted outer branch stent 300, thereby better protecting the outer branch stent 300. In addition, the thin-walled area extending between the bottom 51 of the groove and the support cover 4 will change the hemodynamics of the blood in the groove 5, thereby accelerating the formation of thrombus in a short period of time, causing the thrombus to quickly fill the groove 5, thereby sealing the groove 5, which is beneficial to provide support for the implanted external branch stent 300, preventing the external branch stent 300 from twisting and shifting, and is also beneficial to rapid endothelialization of the groove 5 and the support cover 4 area, further reducing the risk of damage to the external branch stent 300 due to friction and cutting force.

[0152] In this embodiment, referring to FIG. 21 , the first protection unit 721 includes a third sheet-like structure 7213, and the second protection unit 722 includes a fourth sheet-like structure 7223. The third sheet-like structure 7213 has a first movable end 7214, which includes a thin-walled region. The edge of the first movable end 7214, i.e., the end of the third sheet-like structure 7213 further from the trough 4711, is generally curved toward the crest 4721. The fourth sheet-like structure 7223 has a second movable end 7224, which includes a thin-walled region. The edge of the second movable end 7224, i.e., the end of the fourth sheet-like structure 7223 further from the crest 4721, is generally curved toward the crest 4721. The shape of the edge of the second movable end 7224 matches that of the first movable end 7214, thereby completely covering the hooking gap G. This arrangement facilitates the thin-walled regions of the first and second movable ends 7214, 7224 to deform relative to other regions of the sheet-like structures and extend toward the groove bottom 51 when the outer branch stent 300 is inserted between the third and fourth sheet-like structures 7213, 7223. It will be appreciated that in other embodiments, the edges of the first and second movable ends 7214, 7224 may have any other suitable shape, as long as they match and together completely cover the hook gap G. For example, both may be straight, S-shaped, or zigzag. In other embodiments, the thin-walled regions of the first and second movable ends 7214, 7224 may overlap in the radial direction of the groove 5 to jointly completely cover the hook gap G. In this case, the edges of the first and second movable ends 7214, 7224 may have any other suitable shape and do not necessarily need to match.

[0153] Furthermore, in other embodiments, the thin-walled area itself can be made closer to the groove bottom 51 relative to the hooking unit 47, which can increase the probability of the thin-walled area being deformed relative to other areas of the sheet structure when the outer branch bracket 300 is inserted into the hooking gap G. In addition, other areas of the sheet structure can also play a certain guiding role.

[0154] Further, referring to Figure 20 , the thin-walled region may include at least one cracking strip 725, which may be in any suitable shape, such as a straight line, a curved line, or a broken line. In this embodiment, the cracking strip 725 may be a region thinner than other regions of the thin-walled region. For example, an indentation formed by hot pressing the thin-walled region may be formed, where the region containing the indentation is thinner than other regions of the thin-walled region. In other embodiments, a plurality of small holes may be provided at intervals along the length of the cracking strip 725 to similarly achieve the desired cracking effect.

[0155] In this embodiment, the crack strip 725 extends roughly along the axial direction of the groove bracket 100, with one end extending to the edge of the movable end and the other end extending in a direction away from the movable end. In other embodiments, the crack strip 725 may be inclined at a certain angle to the axial direction of the groove bracket 100, and the angle may be greater than 0° and less than 90°. In other embodiments, the crack strip 725 may not extend to the edge of the movable end, and it may be at 90° to the axial direction of the groove bracket 100. When the crack strip 725 forms a crack, the sheet structure is divided into at least two pieces in the axial direction, of which the piece closer to the edge of the movable end is more easily deformed by the inserted outer branch bracket 300 toward the groove bottom 51.

[0156] The break strip 725 of this embodiment breaks open to form a fissure when the outer branch stent 300 is inserted from the outside toward the groove bottom 51 into the hooking gap G. At least a portion of the thin-walled region adjacent to the fissure deforms relative to the rest of the sheet structure and extends toward the groove bottom 51. This arrangement further increases the probability that the thin-walled region will deform relative to the rest of the sheet structure when the outer branch stent 300 is inserted into the hooking gap G. Furthermore, the break strip effectively guides the thin-walled region into a desired shape after the outer branch stent 300 is inserted.

[0157] The protection unit 72 may be made of one or more of the following polymer materials: PTFE, PET, ePTFE, FEP, silicone, L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, polyhydroxy fatty acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone, and any other suitable material may also be used.

[0158] Example 4

[0159] The groove bracket 100 of this embodiment is substantially the same as that of the first embodiment, and the similarities are not repeated here. The difference lies in the structure of the protection unit 72 of the groove bracket 100 of this embodiment.

[0160] 21 , the protective structure 70 of this embodiment includes a third protective unit 726 , which includes a polymer coating 7261 that covers the hooking gap G. Furthermore, the troughs 4711 of the first hooking unit 471 and / or the crests 4721 of the second hooking unit 472 are relatively movable in the axial direction. At least a portion of the support cover 4 is provided with insertion holes. For example, insertion holes are formed between two adjacent hooking units 47 for inserting a guidewire and an outer branch stent 300. This arrangement helps reduce the probability of the outer branch stent 300 being guided by the guidewire into the hooking gap G, thereby reducing the probability of the outer branch stent 300 being damaged by friction.

[0161] The third protective unit 726 comprises a double-layer polymer coating, namely a first coating and a second coating. The first coating covers the hooking gap G on the outside of the hooking unit 47 (i.e., the side farther from the groove bottom 51), while the second coating covers the hooking gap G on the inside of the hooking unit 47 (i.e., the side closer to the groove bottom 51). The first and second coatings overlap, sandwiching the hooking unit 47 therebetween. A receiving gap is also formed between the first and second coatings. The troughs 4711 of the first hooking unit 471 and / or the crests 4721 of the second hooking unit 472 are located within the receiving gap, allowing the troughs 4711 of the first hooking unit 471 and / or the crests 4721 of the second hooking unit 472 to move relative to each other in the axial direction. This allows the support cap 4 to maintain good bending properties and effectively conform to the deformation of the blood vessel wall.

[0162] In other embodiments, the trough 4711 of the first hook unit 471 and / or the crest 4721 of the second hook unit 472 may be located on one side of the double-layer polymer coating. For example, a first perforation and a second perforation are provided on the first coating. The trough 4711 of the first hook unit 471 and the partial wave rod section connected to the trough 4711 pass through the first perforation and are located on the outside of the first coating. The crest 4721 of the second hook unit 472 and the partial wave rod section connected to the crest 4721 pass through the second perforation and are also located on the outside of the first coating. In other embodiments, the second coating may be provided with a first perforation and a second perforation, and the trough 4711 of the first hooking unit 471 and the partial wave rod section connected to the trough 4711 pass through the first perforation and are located on the inner side of the second coating, and the peak 4721 of the second hooking unit 472 and the partial wave rod section connected to the peak 4721 pass through the second perforation and are also located on the inner side of the second coating. In other embodiments, the trough 4711 of the first hooking unit 471 and the portion of the rod connected to the trough 4711 may be located outside the first coating, while the crest 4721 of the second hooking unit 472 and the portion of the rod connected to the crest 4721 may be located inside the second coating; or the trough 4711 of the first hooking unit 471 and the portion of the rod connected to the trough 4711 may be located inside the second coating, while the crest 4721 of the second hooking unit 472 and the portion of the rod connected to the crest 4721 may be located outside the first coating. This is sufficient as long as the polymer coating 7261 completely covers the hooking gap G and the trough 4711 of the first hooking unit 471 and / or the crest 4721 of the second hooking unit 472 are relatively movable in the axial direction.

[0163] 22 , the polymer coating 7261 can further cover the other braided wires 40 on the support cap 4 to further provide better protection for the support cap 4 and the external branch stent 300. However, an insertion hole 7262 must be reserved in at least a portion of the support cap 4 to allow the guidewire and the external branch stent 300 to pass through the insertion hole 7262 and into the radial gap between the support cap 4 and the groove bottom 51. The shape of the insertion hole 7262 is not limited and can be, for example, a polygon such as a circle, an ellipse, a triangle, a quadrilateral, or any other suitable shape.

[0164] Furthermore, one or more crack strips 725 may be provided at the edge of the aforementioned insertion hole 7262. The shape and position of the crack strips 725 can be referred to the description of the third embodiment and will not be elaborated here. When subjected to external force, the crack strips 725 are easily broken to increase the circumference of the insertion hole 7262. This not only accommodates the insertion of external branch stents 300 of various sizes, but also, after the external branch stent 300 is inserted, the area of ​​the polymer coating 7261 adjacent to the crack formed by the crack strips 725 deforms relative to other areas of the polymer coating 7261 and extends toward the groove bottom 51. This helps to increase the contact area between the protective unit 72 and the external branch stent 300 inserted therein, thereby better protecting the external branch stent 300. In addition, the polymer coating 7261 area extending between the groove bottom 51 and the support cover 4 will change the hemodynamics of the blood in the groove 5, thereby accelerating the formation of thrombus in a short period of time, so that the thrombus quickly fills the groove 5, thereby sealing the groove 5, which is beneficial to provide support for the implanted external branch stent 300, prevent the external branch stent 300 from twisting and shifting, and is also beneficial to the rapid endothelialization of the groove 5 and the support cover 4 area, further reducing the risk of damage to the external branch stent 300 due to friction and cutting force.

[0165] The protection unit 72 may be made of one or more of the following polymer materials: PTFE, PET, ePTFE, FEP, silicone, L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, polyhydroxy fatty acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone, and any other suitable material may also be used.

[0166] Example 5

[0167] The present embodiment provides a groove bracket 100, which includes a main bracket 10 and a support cover 4. The main bracket 10 is tubular and has an inner cavity. The side of the main bracket 10 is recessed toward its inner cavity to form a groove 5, and the groove 5 includes a groove bottom 51. The support cover 4 is connected to the main bracket 10, and at least a portion of the support cover 4 and the groove bottom 51 form a radial gap in the radial direction of the groove bracket 100. The support cover 4 includes a mesh structure 4a woven from braided wires 40, and the mesh structure 4a includes a plurality of mesh holes, which connect the groove 5 to the outside world. The groove bracket 100 of this embodiment can adopt any one of the bracket structures in Examples 1 to 4. The specific bracket structure can refer to the contents described in Examples 1 to 4, and will not be described in detail in this embodiment. It can be understood that this embodiment can also adopt any other suitable bracket structure. For example, the braided structure of the support cover 4 of the groove bracket 100 can be different from that of the aforementioned embodiment, and the protective structure 70 can be omitted on the support cover 4. In the aforementioned embodiment, the support cover 4 of the groove bracket 100 includes a mesh structure 4a woven by braided wires 40, and the mesh structure 4a includes a braiding starting end B0 and a braiding tail end E0. The braiding starting end B0 and the braiding tail end E0 can be connected to each other by welding, bonding, winding, etc., and can be a fixed connection or a movable connection.

[0168] 23 and 24 , in this embodiment, the braiding start end B0 and the braiding end E0 are fixed to each other by a fixing member 8. The fixing member 8 not only firmly connects the braiding start end B0 and the braiding end E0, but also avoids the risk of damage to the mechanical properties of the areas near the braiding start end B0 and the braiding end E0 due to welding.

[0169] Exemplarily, the fixing member 8 includes a fixing sleeve 81, which includes a sleeve inner cavity, and the braiding starting end B0 and the braiding tail end E0 are fixed in the sleeve inner cavity. The braiding starting end B0 and the braiding tail end E0 can be fixed to the fixing sleeve 81 by applying pressure to the outside of the fixing sleeve 81. The braiding starting end B0 and the braiding tail end E0 are arranged relative to each other in the longitudinal direction of the braided wire 40. For example, the braiding starting end B0 and the braiding tail end E0 are butted together as shown in the figure. In other embodiments, the braiding starting end B0 and the braiding tail end E0 can be spaced apart. The advantage of the braiding starting end B0 and the braiding tail end E0 being arranged relative to each other along the length direction in the fixed sleeve 81 is that the width of the connection between the braiding starting end B0 and the braiding tail end E0 can be reduced, and a fixed sleeve 81 with a smaller width can be used, which can reduce the risk of the fixed sleeve 81 hooking the braided wire 40 in other areas, causing the mesh adjacent to the fixing member 8 to be unable to fully expand and hindering the insertion of the guide wire or the external branch stent 300. In addition, it can also reduce the risk of the braided wire 40 being damaged by the fixing member 8 due to friction or hooking of the braided wire 40 in other areas. It is understandable that in other embodiments, the braiding starting end B0 and the braiding tail end E0 can also be arranged side by side in the width direction in the fixed sleeve 81. It is understandable that the structure of the fixing member 8 of this embodiment is not unique. In addition to the fixed sleeve 81 exemplified in this embodiment, it can also be a fixed wire or a fixed ring, such as wrapping or suturing the braiding starting end B0 and the braiding tail end E0 with a fixed wire, or wrapping the braiding starting end B0 and the braiding tail end E0 with a fixed ring.

[0170] The fixing member 8 can be made of a material having a certain imaging function, and the fixing member 8 can assist in positioning under imaging equipment such as a digital subtraction angiography (DSA). For example, the fixing member 8 can be made of a metal material such as stainless steel, nickel titanium, platinum, or a polymer material doped with a developing material such as iohexol, or any other suitable material. When the fixing member 8 includes a fixed sleeve 81, since the fixed sleeve 81 is sleeved outside the braiding starting end B0 and the braiding tail end E0, and its width is greater than the wire diameter of the braiding wire 40, the position of the fixing member 8 can be well distinguished under the imaging image, which is conducive to improving the effect of auxiliary positioning.

[0171] In this embodiment, there can be multiple fixing members 8, and the axial distance between at least one fixing member 8 and the proximal end of the groove opening 52 is smaller than the axial distance between the fixing member 8 and the distal end of the groove opening 52; or, the axial distance between at least one fixing member 8 and the proximal end of the groove opening 52 is larger than the axial distance between the fixing member 8 and the distal end of the groove opening 52. The purpose of this arrangement is to instruct the surgical operator to align the branch blood vessel 200, so that the subsequent insertion position of the external branch stent 300 is more accurate. In addition, this arrangement can also reduce the risk of damage to the fixing member 8 and the braided wire 40 adjacent to the fixing member 8 caused by the groove stent 100 bulging and bending toward the support cover 4 and bending laterally in accordance with the blood vessel after the groove stent 100 is implanted.

[0172] For example, when the axial distance between the fixing member 8 and the proximal end of the groove opening 52 is less than the axial distance between the fixing member 8 and the distal end of the groove opening 52, the ratio of the axial distance between the fixing member 8 and the proximal end of the groove opening 52 to the axial length of the groove opening 52 is in the range of 5% to 15%; when the axial distance between the fixing member 8 and the proximal end of the groove opening 52 is greater than the axial distance between the fixing member 8 and the distal end of the groove opening 52, the ratio of the axial distance between the fixing member 8 and the distal end of the groove opening 52 to the axial length of the groove opening 52 is in the range of 5% to 15%. Due to the continuous pulsation of the blood vessel, the implanted groove stent 100 may be slightly displaced, which may cause the position indicated by the fixing member 8 to differ from the expected position. By limiting the axial distance between the fixing member 8 and the axial end of the groove opening 52 to greater than or equal to 5% of the axial length of the groove opening 52, position errors can be reserved for displacement of the groove stent 100 caused by blood vessel pulsation. In addition, by limiting the axial distance between the fixing member 8 and the axial end of the groove opening 52 to less than or equal to 15% of the axial length of the groove opening 52, the probability of the outer branch stent 300 and the inner branch stent 5 located near the groove opening 52 being too short due to being too far away from the groove opening 52 can be reduced.

[0173] 23 , in this embodiment, the fixing member 8 is located at the edge of the support cover 4. For example, the fixing member 8 can be provided at the radial edge and / or axial edge of the support cover 4. Since the fixing member 8 is located at the edge of the support cover 4, compared with other areas of the support cover 4, the braided wires 40 located at the edge are not easy to slide relative to the braided wires 40 in other areas. Therefore, the risk of the fixing member 8 and other braided wires 40 being damaged by friction with each other can be reduced. At the same time, the risk of the fixing member 8 hooking other braided wires 40 and causing the mesh to be deformed and unable to be fully deployed can be reduced. In particular, when the fixing member 8 is provided at the radial edge of the support cover 4, even if the groove bracket 100 is subjected to a large radial compressive force (for example, the groove bracket 100 is loaded in a conveyor), the fixing member 8 is not easy to be broken and can always maintain a stable connection.

[0174] 23 and 27 to 29 , the groove 5 includes an axial edge and a radial edge, wherein the axial edge of the groove 5 is spaced apart and arranged oppositely along the axial direction of the groove bracket 100, and the radial edge of the groove 5 is spaced apart and arranged oppositely along the radial direction of the groove bracket 100. A corner 53 is formed between the axial edge and the radial edge of the groove 5. The fixing member 8 includes a first axial end 82 and a second axial end 83. The first axial end 82 of the fixing member 8 is located at or near the corner 53 of the groove 5 (wherein, the first axial end 82 of the fixing member 8 is located near the corner 53 of the groove 5 means that the distance between the first axial end 82 of the fixing member 8 and the corner 53 of the groove 5 does not exceed 5 mm). The second axial end 83 of the fixing member 8 is farther away from the corner than the first axial end 82, and the fixing member 8 is arranged along the radial edge of the groove 5. It should be noted that the fact that the fixing member 8 is disposed along the radial edge of the groove 5 does not mean that the fixing member 8 must completely fit the radial edge of the groove 5 as shown in FIG27 . A gap between a portion of the fixing member 8 and the radial edge of the groove 5 may be permitted. In other embodiments, the fixing member 8 may be disposed along the axial edge of the groove 5. Compared to being disposed along the axial edge of the groove 5, the fixing member 8 of this embodiment is disposed along the radial edge of the groove 5. Therefore, when the groove bracket 100 is subjected to a large radial extrusion force, the fixing member 8 is less likely to be broken and can always maintain a stable connection. In addition, the probability of the end of the fixing member 8 damaging (e.g., puncturing) the radial side wall of the groove 5 when subjected to radial extrusion is reduced. In other embodiments, the fixing member 8 can be set at a position on the radial edge of the groove 5 away from the corner 53. Compared with the case where the fixing member 8 is set at a position away from the corner 53, the fixing member 8 of this embodiment is set close to the corner 53 of the groove 5, which can avoid affecting the lateral bending performance of the groove 5 area, and can also help the surgical operator better determine the release position of the groove bracket 100. For example, with the assistance of imaging equipment, the position of the axial edge of the groove 5 can be prompted to the surgical operator by identifying the development of the fixing member 8, which can avoid blocking the blood flow of the branch blood vessel 200 due to inaccurate release position of the groove bracket 100.

[0175] Referring to Figure 23 , the support cap 4 is connected to the groove 5 via an edge corrugation 421. A fixing member 8 is disposed on the edge corrugation 421, which is connected to the hook unit 47. Referring to Figure 23 , the fixing member 8 is disposed on a third corrugated rod 4212 (denoted as edge corrugated rod 4212a), which directly connects the edge corrugation 421 to the radial edge of the groove 5. This edge corrugated rod 4212a extends generally along the radial edge of the groove 5 and is connected to the hook unit 47. For example, this edge corrugated rod 4212a is connected to the second hook member 472 of the hook unit 47. Because the first hook member 471 and the second hook member 472 of the hook unit 47 are relatively movable in the axial direction, axial forces or axial movements in other areas of the support cap 4 are not easily transmitted to the edge corrugation 421, thereby reducing the risk of the vertex 4211 of the edge corrugation 421 puncturing a blood vessel.

[0176] Furthermore, the fixing member 8 may be adjacent to or located near the vertex 4211 of the edge wave angle 421 (the fixing member 8 being located near the vertex 4211 of the edge wave angle 421 means that the fixing member 8 is no more than 5 mm away from the vertex 4211 of the edge wave angle 421 of the groove 5). Since the fixing member 8 is wider than the braided wire 40, it can limit the vertex 4211 of the edge wave angle 421 to a certain extent, further reducing the risk of the vertex 4211 of the edge wave angle 421 piercing and injuring a blood vessel.

[0177] In this embodiment, the support cover 4 includes a first proximal edge wave angle 421c, a second proximal edge wave angle 421d, a first distal edge wave angle 421a, and a second distal edge wave angle 421b. In the figure, the fixing member 8 is arranged at the first distal edge wave angle 421a. Since a double-branch port bracket 61 is provided near the proximal end of the support cover 4 (i.e., near the proximal end of the groove opening 52), and a single-branch port bracket 62 is provided near the proximal end of the support cover 4 (i.e., near the distal end of the groove opening 52), the fixing member 8 is arranged at the distal end of the support cover 4 (i.e., the distal end of the groove opening 52), which helps to avoid increasing the difficulty of sheathing near the proximal end of the support cover 4. In addition, after implantation, the groove stent 100 will bend laterally to conform to the blood vessels. The radial edge where the first distal edge wave angle 421a is located is on the outer side of the lateral bending (i.e., the side that is stretched when bending), and the radial edge where the second distal edge wave angle 421b is located is on the inner side of the lateral bending (i.e., the side that is compressed when bending). Therefore, the fixing member 8 is arranged at the first distal edge wave angle 421a and will not hinder the lateral bending of the support cover 4, thereby ensuring that the support cover 4 has better lateral bending performance. In addition, as shown in the figure, since a fixing part 8 is provided at the first distal edge wave angle 421a, the first side connection point 46a connected to the first distal edge wave angle 421a can be omitted compared to the second distal edge wave angle 421b located on the radially opposite side of the first distal edge wave angle 421a, so that the mesh area of ​​the mesh where the first distal edge wave angle 421a is located is larger than the mesh area of ​​the mesh where the second distal edge wave angle 421b is located, which can facilitate the insertion of the guide wire and the outer branch stent 300.

[0178] 27 to 29 , the radial edge of the groove 5 has an inner wall 501, and the fixing member 8 is fixedly connected to the inner wall 501 by suturing, bonding, etc. This arrangement has the advantage that even if the fixing member 8 or the braided wire 40 in the area adjacent to the fixing member 8 breaks, the sidewalls of the radial edge of the groove 5 (which are provided with a film) can prevent the broken fixing member 8 or the braided wire 40 near the broken fixing member 8 from piercing the tissue wall and damaging it.

[0179] In this embodiment, the fixing member 8 is sutured to the inner wall 501 of the radial edge of the groove 5 via sutures. The sutures form multiple suture fixing points 9 on the outer surface of the fixing member 8. For example, the sutures are wound around the outer surface of the fixing member 8 to form multiple suture loops. The multiple suture loops are arranged in the longitudinal direction of the fixing member 8. Each suture loop secures the fixing member 8 to the inner wall 501 of the radial edge of the groove 5, forming a suture fixing point 9. By forming multiple suture fixing points 9 on the outer surface of the fixing member 8, a secure connection between the fixing member 8 and the radial edge of the groove 5 can be ensured. It is understood that in other embodiments, the number of suture fixing points 9 can be one or more, and the suture routing method can also differ from that exemplified in this embodiment.

[0180] Further, with reference to Figures 24 and 29, in this embodiment, the braided wire segment adjacent to the braiding starting end B0 is recorded as the first segment 401, and the braided wire segment adjacent to the braiding tail end E0 is recorded as the second segment 402. The first segment 401 includes a first inner segment 4011 located within the fixed sleeve 81 and a first outer segment 4012 connected to the first inner segment 4011 and located outside the fixed sleeve 81. The second segment 402 includes a second inner segment 4021 located within the fixed sleeve 81 and a second outer segment 4022 connected to the second inner segment 4021 and located outside the fixed sleeve 81. The first outer segment 4012 and / or the second outer segment 4022 are fixedly connected to the inner wall 501 of the radial edge of the groove 5. Even if the braided wire segment near the end of the fixed sleeve 81 is broken, it can prevent the broken braided wire 40 from piercing and damaging the inner wall of the tissue.

[0181] 25 and 26 , in another embodiment, the fixing member 8 may be disposed in the second mesh region 42 . The specific structure of the second mesh region 42 may refer to the description of the first embodiment. The fixing member 8 is disposed on the first-direction support wire 481 or the second-direction support wire 482 . Regardless of whether the groove stent 100 is in the loaded state or the implanted state, the fixing member 8 and the adjacent braided wire segments located on the first-direction support wire 481 or the second-direction support wire 482 are not subjected to excessive bending forces. Therefore, the fixing member 8 and the adjacent braided wire segments are not easily broken, causing damage to the support cover 4 or puncturing damaged tissue. Exemplarily, the fixing member 8 is located at the nearest intersection unit 48a in the second mesh area 42 (refer to Figure 25) or at the farthest intersection unit 48b (refer to Figure 26). In other embodiments, the fixing member 8 is located near the nearest intersection unit 48a in the second mesh area 42 (the distance from the nearest intersection unit 48a does not exceed 5 mm) or near the farthest intersection unit 48 (the distance from the farthest intersection unit 48b does not exceed 5 mm). The location of the fixing member 8 here can well indicate the insertion position of the outer branch stent 300. In addition, it can not only reserve position error for the displacement of the groove stent 100, but also reduce the probability of the outer branch stent 300 and the inner branch stent 5 located near the groove opening 52 being too short due to being too far away from the groove opening 52. Furthermore, when the fixing member 8 is located at the intersection unit 48 in the second mesh area 42, the fixing member 8 is located on the support wire in the intersection unit 48 that is closer to the bottom 51 of the groove. This arrangement can reduce the irritation of the fixing member 8 to the inner wall of the tissue after the groove bracket 100 is implanted because another support wire is provided between the fixing member 8 and the inner wall of the tissue.

[0182] In this embodiment, a protective structure 70 may be provided on at least part of the outer surface of the fixing part 8. In particular, when the protective structure 70 includes a polymer film layer and completely wraps the outer surface of the fixing part 8, the fixing part 8 and its adjacent braided wire segments are not easily broken to cause damage to the support cover 4 or pierce damaged tissue, and even if they are broken, they are not likely to directly pierce the damaged tissue.

[0183] 2 , 23 and 30 , this embodiment further provides a method for preparing a groove bracket 100 , comprising:

[0184] S10: Provide a main frame 10 and a support cover 4;

[0185] S20: Connect the support cover 4 to the main frame 10.

[0186] The preparation method of the support cover 4 includes:

[0187] S11: providing braided wire 40;

[0188] S12: weaving the braided wire 40 through multiple paths to form a mesh structure 4a, the mesh structure 4a including a weaving start end B0 and a weaving end end;

[0189] S12 : Fix the braiding start end B0 and the braiding end E0 of the mesh structure 4 a to each other through a fixing member 8 .

[0190] The mesh structure 4a can be integrally woven from braided wires 40, and the mesh structure 4a has only one braided starting end B0 and one braided tail end E0. For example, the mesh structure 4a of this embodiment is integrally woven from a single braided wire 40, and this single braided wire 40 is a monofilament. In other embodiments, the mesh structure 4a can be woven from multiple braided wires 40, each of which can be a monofilament structure or a structure formed by winding multiple wires. In other embodiments, the support cover 4 can also include multiple mesh structures 4a, each of which can be integrally woven or separately woven and then spliced ​​together.

[0191] The multiple paths mentioned above include multiple first direction paths and multiple second direction paths. Step S12 is described using the figure as an example.

[0192] Step S12 includes:

[0193] Step A: weaving along a first direction path to form a first direction weaving unit;

[0194] Step B: weaving along a second direction path to form a second direction weaving unit;

[0195] Repeat step A and step B alternately until a network structure 4a is formed.

[0196] Referring to Figure 30 , the first direction path refers to the path extending from right to left in the figure, such as P1, P3, P5, P7, and P9. The second direction path refers to the path extending from left to right in Figure 30 , such as P2, P4, P6, P8, and P10. Among them, each first direction path and second direction path can include multiple sub-paths. In Figure 30, P11 to P104 represent multiple sub-paths, such as P1 includes sub-paths P11, P12, P13, and P14, P2 includes sub-paths P21, P22, and P23 in sequence, P3 includes sub-paths P31, P32, and P33 in sequence, P4 includes sub-paths P41, P42, and P43 in sequence, P5 includes sub-paths P51, P52, and P53 in sequence, P6 includes sub-paths P61, P62, P63, and P64 in sequence, P7 includes sub-paths P71, P72, and P73 in sequence, P8 includes sub-paths P81, P82, and P83 in sequence, P9 includes sub-paths P91, P92, and P93 in sequence, and P10 includes sub-paths P101, P102, P103, and P104 in sequence.

[0197] For example, weaving starts from the weaving starting end B0, and weaving is carried out along the sub-paths P11, P12, P13, and P14 of the path P1 to form a first direction weaving unit A1, and weaving is carried out along the sub-paths P21, P22, and P23 of the path P2 to form a second direction weaving unit B1, and weaving is carried out along the sub-paths P31, P32, and P33 of the path P3 to form a first direction weaving unit A2, and weaving is carried out along the sub-paths P41, P42, and P43 of the path P4 to form a second direction weaving unit B2, and weaving is carried out along the sub-paths P51, P52, and P53 of the path P5 to form a first direction weaving unit A3, and weaving is carried out along the sub-paths P61, P62, and P63 of the path P6 to form a second direction weaving unit B1. P63 and P64 are woven to form the second direction weaving unit B3, and the first direction weaving unit A4 is woven along the sub-paths P71, P72, and P73 of the path P7 in sequence, and the second direction weaving unit B4 is woven along the sub-paths P81, P82, and P83 of the path P8 in sequence, and the first direction weaving unit A5 is woven along the sub-paths P91, P92, and P93 of the path P9 in sequence, and the second direction weaving unit B5 is woven along the sub-paths P101, P102, P103, and P104 of the path P10 in sequence, and the weaving is ended at the weaving terminal E0. Finally, the weaving starting end B0 and the weaving terminal E0 are cut to an appropriate length and fixed to each other with a fixing member 8.

[0198] The first direction braiding units and the second direction braiding units are alternately formed and connected to each other, and at least one intersection is formed between the adjacent first direction braiding units and the second direction braiding units.

[0199] It is understood that in other embodiments, the first direction path can be from left to right, and the second direction path can be from right to left. In other embodiments, the weaving starting end and the weaving ending end can be completely different from those in this embodiment. For example, E0 can be used as the weaving starting end and B0 can be used as the weaving ending end, and weaving in the direction opposite to the direction of the arrow in Figure 30 can also form a mesh structure 4a. For example, the weaving starting end and the weaving ending end can be selected near the intersection of sub-path P22 and sub-path P102. Any other suitable weaving starting end and weaving ending end can also be used, as long as the mesh structure 4a can be formed by weaving.

[0200] A side connector 46 may also be provided between the adjacent first direction braiding units and the second direction braiding units. For example, a second side connector 46b is provided between the first direction braiding unit A1 and the second direction braiding unit B1 located at the axial end, a second side connector 46b is provided between the first direction braiding unit A3 and the second direction braiding unit B3 located at the other axial end, and a second side connector 46b is provided between the first direction braiding unit A4 and the second direction braiding unit B3. Except for the braiding starting end B0 and the braiding terminal, a first side connector 46a is provided between other adjacent first direction braiding units and second direction braiding units. In this embodiment, the shape of the first side connector 46a is different from that of the second side connector 46b. Referring to Figure 30, the first side connector 46a is roughly triangular, while the second side connector 46b is roughly elliptical. In other embodiments, the two may adopt any other suitable shape, and specific reference may be made to the description of Example 1. In other embodiments, the two may have the same shape.

[0201] It can be understood that the structure of the groove bracket 100 in the above-mentioned embodiments 1 to 5 may be different from the structure exemplified above. Please refer to Figure 31. In some embodiments, the groove bracket 100 includes a first branch bracket 601 and a second branch bracket 602. The first branch bracket 601 is arranged in the main bracket 10 and is connected to the groove 5. One end of the second branch bracket 602 is fixedly connected to and connected with the main bracket 10, and the other end is a free end and has a branch port. The free end of the second branch bracket 602 is arranged outside the main bracket 10 for implantation in the branch blood vessel 200 or connection with other brackets. The length extension direction of the second branch bracket 602 intersects with the axial direction of the groove bracket 10; the second branch bracket 602 and the first branch bracket 601 are both connected to the inner cavity of the main bracket 10. After the second branch stent 602 is connected to the corresponding branch vessel 200, the groove 5 of the groove stent 100 is aligned with the opening of the other branch vessel 200, which can reduce the situation where the groove 5 is difficult to align with the corresponding branch vessel 200 due to deflection of the groove stent 100 after release. In addition, the free end of the second branch stent 602 is arranged outside the main stent 10, so that the second branch stent 602 can be implanted in the branch vessel 200 without occupying the space of the inner lumen of the main stent 10, thereby reducing the branch stent's occupancy of the inner lumen of the main stent 10 and increasing the blood flow in the inner lumen of the main stent 10. Compared with the first branch stent 601 and the second branch stent 602 arranged side by side in the radial direction within the main stent 10, the free end of the second branch stent 602 is arranged outside the main stent 10 in this embodiment. This also allows the guidewire or the outer branch stent 300 to enter the corresponding branch stent more accurately, reducing the risk of the guidewire accidentally entering another branch stent. For example, the length extension direction of the second branch stent 602 is perpendicular to the axial direction.

[0202] Referring to Figures 31 and 32 , in some embodiments, a first branch stent 601 is disposed within the main stent 10 and communicates with the groove 5; a second branch stent 602 and the first branch stent 601 are disposed axially on one side of the groove 5. Exemplarily, the second branch stent 602 and the first branch stent 601 are disposed proximally of the groove 5, i.e., both the second branch stent 602 and the first branch stent 601 are disposed in the proximal section 2 of the main stent 10. If the first branch stent 601 and the second branch stent 602 are radially arranged side by side proximally of the groove 5, the portion of the first branch stent 601 adjacent to the second branch stent 602, the portion of the second branch stent 602 adjacent to the first branch stent 601, and the inner wall of the main stent 10 enclose a triangular region. Blood flow impacts this triangular region, generating vortices that affect the flow of blood within the lumen of the main stent 10. In this embodiment, the second branch stent 602 is arranged outside the main stent 10, and the first branch stent 601 and the second branch stent 602 on the axial side of the groove 5 will not form a triangular area with the main stent 10, thereby reducing the impact on the blood flow direction in the inner cavity of the main stent 10.

[0203] Referring to Figure 31 , in some embodiments, a guide segment 6012 is formed at the distal end of the first branch stent 601. The cross-sectional area of ​​the guide segment 6012 gradually increases from the proximal end to the distal end. The distal end of the first branch stent 601 is designed as a bell-shaped guide segment 6012, which can guide the entry of a guide wire or an outer branch stent 300.

[0204] Please refer to Figure 33. For example, the proximal end of the groove stent 100 is the upper end, and the distal end of the groove stent 100 is the lower end. The second branch stent 602 is arranged on the right side of the first branch stent 601 to better adapt to the three branch blood vessels 200 near the aortic arch 300. The second branch stent 602 is used to implant the branch blood vessel 200 on the far left in Figure 1. After the second branch stent 602 is implanted into the corresponding branch blood vessel 200, it can position the groove stent 100 to a certain extent, so that the groove 5 is aligned with the other two branch blood vessels 200; after the second branch stent 602 is implanted into the corresponding branch blood vessel 200, the second branch stent 602 will not interfere with the implantation of the corresponding outer branch stent 300 in the other two branch blood vessels 200, nor will it interfere with the connection between the outer branch stent 300 and the corresponding inner branch stent 8.

[0205] In some embodiments, the first branch bracket 601 may also be arranged outside the main bracket 10. For example, one end of the first branch bracket 601 is fixedly connected and communicated with the main bracket 10, and the other end is a free end and has a branch opening. The free end of the first branch bracket 601 is arranged outside the main bracket 10, and the length extension direction of the first branch bracket 601 intersects with the axial direction. The first branch bracket 601 and the second branch bracket 602 are arranged along the axial direction of the groove bracket 100 and are arranged on the proximal section 2. That is, the first branch stent 601 and the second branch stent 602 are respectively used to connect two branch vessels 200. After the first branch stent 601 and the second branch stent 602 connect the corresponding branch vessels 200, the groove 5 of the groove stent 100 is aligned with the opening of the other branch vessel 200, which can effectively reduce the situation where the groove 5 is difficult to align with the corresponding branch vessel 200 due to the easy deflection of the groove stent 100 after release. In addition, the branch openings of the free ends of the first branch stent 601 and the second branch stent 602 are arranged outside the main stent 10, so that the first branch stent 601 and the second branch stent 602 can be implanted in the branch vessel 200 without occupying the space of the inner cavity of the main stent 10, thereby further reducing the space occupied by the branch stent in the inner cavity of the main stent 10 and further increasing the blood flow in the inner cavity of the main stent 10. In other embodiments, the groove stent 100 also includes a third branch stent 83, which is arranged on the distal side of the groove 5. The third branch stent 83 can be disposed outside the main stent 10 like the second branch stent 602 ; alternatively, the third branch stent 83 can be disposed in the inner cavity of the main stent 10 .

[0206] In other embodiments, the first branch stent 601 and the second branch stent 602 may also be disposed at the distal end of the groove 5 , and the third branch stent 83 may be disposed at the proximal end of the groove 5 .

[0207] The above specific embodiments are only some embodiments of the present invention and are not limitations of the present invention. This specification cannot be an exhaustive list of all embodiments of the present invention. Some features of the above different embodiments can be replaced or combined with each other. Those skilled in the art can also make simple replacements according to actual needs. The concept of the present invention shall be subject to the required scope of protection.

Claims

1. A groove bracket, characterized in that: include: A main body support, wherein the main body support is tubular and has an inner cavity, and a side surface of the main body support is recessed toward the inner cavity to form a groove, and the groove includes a groove bottom; A support cover, wherein the support cover is connected to the main support, and at least a portion of the support cover and the bottom of the groove form a radial gap in the radial direction of the groove support, the support cover includes a mesh structure woven by braided wires, the mesh structure includes a plurality of deformable mesh holes, and the mesh holes connect the groove with the outside world; the mesh structure includes a braiding starting end and a braiding tail end, and the braiding starting end and the braiding tail end are fixed to each other by a fixing member.

2. The groove bracket according to claim 1, characterized in that: The fixing member is located at a radial edge and / or an axial edge of the support cover.

3. The groove bracket according to claim 1, characterized in that: The groove includes an axial edge and a radial edge, and a corner is formed between the axial edge and the radial edge of the groove. The fixing member includes a first axial end and a second axial end. The first axial end of the fixing member is located at the corner of the groove or near the corner of the groove, and the second axial end of the fixing member is farther away from the corner than the first axial end, and the fixing member is arranged along the radial edge of the groove.

4. The groove bracket according to any one of claims 1 to 3, characterized in that: The support cover includes an edge wave angle located at an axial end, the edge wave angle includes a vertex, the vertex of the edge wave angle is connected to the corner of the groove, the fixing piece is arranged on the edge wave angle, and the fixing piece is adjacent to the vertex of the edge wave angle or located near the vertex of the edge wave angle.

5. The groove bracket according to claim 4, characterized in that: The edge wave angle is connected to a hook unit, and the hook unit includes a first hook component and a second hook component that are relatively movable in the axial direction.

6. The groove bracket according to any one of claims 1 to 4, characterized in that: The groove comprises a radial edge, the radial edge of the groove has an inner wall, and the fixing member is fixedly connected to the inner wall.

7. The groove bracket according to claim 6, characterized in that: The fixing piece is sutured and connected to the inner wall by sutures, and the sutures form a plurality of suture fixing points on the outer surface of the fixing piece.

8. The groove bracket according to claim 6, characterized in that: The fixing part includes a fixed sleeve, and the fixed sleeve includes a sleeve inner cavity. The braiding starting end and the braiding tail end are fixed in the sleeve inner cavity. The braiding wire segment adjacent to the braiding starting end is recorded as the first segment, and the braiding wire segment adjacent to the braiding tail end is recorded as the second segment. The first segment includes a first inner segment located in the fixed sleeve and a first outer segment connected to the first inner segment and located outside the fixed sleeve. The second segment includes a second inner segment located in the fixed sleeve and a second outer segment connected to the second inner segment and located outside the fixed sleeve. The first outer segment and / or the second outer segment are fixedly connected to the inner wall.

9. The groove bracket according to any one of claims 1 to 8, characterized in that: Along the circumference of the groove bracket, the support cover includes a first mesh area and at least two second mesh areas respectively connected to the two sides of the first mesh area; the second mesh area includes a plurality of first-direction support wires arranged at intervals and a plurality of second-direction support wires arranged at intervals, the first-direction support wires and the second-direction support wires overlap with each other to form a plurality of columns of cross units and a plurality of columns of deformable meshes, and at least one of the fixing members is arranged in the second mesh area.

10. The groove bracket according to any one of claims 1 to 9, characterized in that: The groove includes a groove opening, and the axial distance between at least one of the fixings and the proximal end of the groove opening is smaller than the axial distance between the fixings and the distal end of the groove opening; or, the axial distance between at least one of the fixings and the proximal end of the groove opening is larger than the axial distance between the fixings and the distal end of the groove opening.

11. The groove bracket according to claim 10, characterized in that: When the axial distance between the fixing member and the proximal end of the groove opening is smaller than the axial distance between the fixing member and the distal end of the groove opening, the ratio of the axial distance from the fixing member to the proximal end of the groove opening to the axial length of the groove opening is in the range of 5% to 15%; when the axial distance between the fixing member and the proximal end of the groove opening is larger than the axial distance between the fixing member and the distal end of the groove opening, the ratio of the axial distance from the fixing member to the distal end of the groove opening to the axial length of the groove opening is in the range of 5% to 15%.

12. The groove bracket according to any one of claims 1 to 9, characterized in that: The braiding start end and the braiding tail end are fixed in the fixing piece, the braiding start end and the braiding tail end are arranged opposite to each other in the length direction of the braiding wire, and the braiding start end and the braiding tail end are butt-jointed or spaced apart.

13. The groove bracket according to any one of claims 1 to 9, characterized in that: The groove bracket also includes one or more branch brackets connected to the main bracket, and the branch brackets are all arranged in the main bracket, or at least part of the branch brackets are arranged outside the main bracket.

14. The method for manufacturing a groove bracket according to any one of claims 1 to 13, characterized in that: include: Provide main frame and support cover; Connecting the support cover to the main frame; Wherein, the manufacturing method of the support cover includes: Provide braided wire, Weaving the braided wires through multiple paths to form a mesh structure, wherein the mesh structure includes a weaving start end and a weaving end end; The braiding start end and the braiding tail end of the braiding wire are fixed to each other through a fixing piece.

15. The method for manufacturing a groove bracket according to claim 14, characterized in that: The mesh structure is formed by weaving the braided wires in one piece, and the mesh structure has only one weaving start end and one weaving end end.

16. The method for manufacturing a groove bracket according to claim 14, characterized in that: The multiple paths include multiple first direction paths and multiple second direction paths, and the braided wires are braided through the multiple paths to form a mesh structure, including: Step A: weaving along the first direction path to form a first direction weaving unit; Step B: weaving along the second direction path to form a second direction weaving unit; Repeat step A and step B alternately until a mesh structure is formed, wherein the first direction braiding units and the second direction braiding units are alternately formed and connected to each other, and at least one intersection is formed between the first direction braiding units and the second direction braiding units adjacent to each other.

17. The groove bracket according to any one of claims 1 to 13, characterized in that: A protective structure is provided on the surface of a part or all of the supporting cover.

18. The groove bracket according to claim 17, characterized in that: The protection structure includes one or more protection layers selected from the group consisting of a metal layer, a polymer layer, a ceramic layer, and a composite material layer, which are arranged on the surface of the support cover, wherein the composite material layer is made of one or more materials selected from the group consisting of metal, polymer, and ceramic.

19. The groove bracket according to claim 17, characterized in that: The mesh structure includes a plurality of overlapping points formed by overlapping braided wires, and at least at some of the overlapping points, a protective structure is provided on the surface of the braided wires; and / or, the mesh is a deformable mesh, and at least part of the inner wall of the mesh is provided with the protective structure.

20. The groove bracket according to claim 17, characterized in that: The mesh structure includes a mesh body and side connectors arranged on radial sides of the mesh body. The surface of the mesh body is provided with a protective structure, and at least part of the side connectors are not provided with a protective structure.

21. The groove bracket according to any one of claims 17 to 20, characterized in that: The protection structure includes a protection unit, and the support cover includes at least one row of hooking units, each of the hooking units includes a first hooking member and a second hooking member which are hooked to each other in sequence from the proximal end to the distal end, and a hooking gap is formed between the trough of the first hooking member and the crest of the second hooking member so that the trough of the first hooking member and the crest of the second hooking member can move relative to each other in the axial direction; the protection unit is provided on at least one of the hooking units.

22. The groove bracket according to claim 21, characterized in that: The protection structure includes a first protection unit and / or a second protection unit. The first protection unit is arranged on a side of the first hooking member where the trough faces the hooking gap, and the second protection unit is arranged on a side of the second hooking member where the crest faces the hooking gap.

23. The groove bracket according to claim 21, characterized in that: A first protection unit is provided on the side of the trough of the first hooking member facing the hooking gap, and a second protection unit is provided on the side of the crest of the second hooking member facing the hooking gap, the first protection unit and the second protection unit jointly shield part of the hooking gap, and a through hole is formed between the first protection unit and the second protection unit; the trough of the first hooking member and the crest of the second hooking member can move away from each other in the axial direction to drive the through hole to expand for the insertion of the outer branch bracket, and in the naturally expanded state, the area of ​​the through hole is smaller than the cross-sectional area of ​​the outer branch bracket.

24. The groove bracket according to any one of claims 17 to 23, characterized in that The protection structure includes a protection unit, and the protection unit includes one or more of a sheet structure, a strip structure, and a block structure.

25. The groove bracket according to claim 22, characterized in that: At least one of the first protection unit and the second protection unit includes a main body sheet and an extension sheet, and both the main body sheet and the extension sheet are sheet-like structures. One end of the main body sheet is connected to the hook unit, and the other end extends into the hook gap and is connected to the extension sheet. The extension sheet has a free end, and the extension sheet extends toward the direction close to the bottom of the groove, and the free end of the extension sheet is located between the support cover and the bottom of the groove.

26. The groove bracket according to claim 22, characterized in that: At least one of the first protection unit and the second protection unit includes a sheet-like structure, and the sheet-like structure has a movable end, and the movable end includes a thin-walled area, the thickness of the thin-walled area is less than the thickness of other areas of the protection unit, when the outer branch bracket is inserted into the hooking gap from the outside toward the direction close to the groove, at least part of the thin-walled area is deformed relative to other areas of the sheet-like structure and extends toward the direction close to the bottom of the groove.

27. The groove bracket according to claim 26, characterized in that: The thin-walled area includes at least one crack-prone strip, which cracks to form a crack when the outer branch bracket is inserted into the hooking gap from the outside toward the bottom of the groove, and at least part of the area adjacent to the crack in the thin-walled area is deformed relative to other areas of the sheet structure and extends toward the bottom of the groove.

28. The groove bracket according to claim 21, characterized in that: The protective structure includes a first protective unit and a second protective unit, and the first protective unit and the second protective unit jointly cover the hooking gap; or, the protective structure includes a third protective unit, and the third protective unit includes a polymer film, and the polymer film completely covers one or more of the hooking gaps, and the trough of the first hooking unit and / or the crest of the second hooking unit can move relative to each other in the axial direction, and at least a partial area of ​​the support cover is provided with a socket.

29. A groove bracket, characterized in that: include: A main body support, wherein the main body support is tubular and has an inner cavity, and a side surface of the main body support is recessed toward the inner cavity to form a groove, and the groove includes a groove bottom; A support cover, wherein the support cover is connected to the main support, and at least a portion of the support cover and the bottom of the groove form a radial gap in the radial direction of the groove support, and the support cover can connect the groove with the outside world; a protective structure is provided on the surface of part or all of the support cover.

30. The groove bracket according to claim 29, characterized in that: The protection structure includes one or more protection layers selected from the group consisting of a metal layer, a polymer layer, a ceramic layer, and a composite material layer, which are arranged on the surface of the support cover, wherein the composite material layer is made of one or more materials selected from the group consisting of metal, polymer, and ceramic.

31. The groove bracket according to claim 29, characterized in that: The support cover includes a mesh structure woven from braided wires, the mesh structure includes a plurality of mesh holes, the mesh structure includes a plurality of overlapping points formed by overlapping braided wires, at least at some of the overlapping points, a protective structure is provided on the surface of the braided wires; and / or, the mesh holes are deformable mesh holes, and the protective structure is provided on at least some of the inner walls of the mesh holes.

32. The groove bracket according to claim 29, characterized in that: The support cover comprises a mesh structure, which comprises a mesh body and side connectors arranged on the radial sides of the mesh body. The surface of the mesh body is provided with a protective structure, and at least part of the side connector is not provided with a protective structure.

33. A groove bracket according to any one of claims 29 to 32, characterized in that: The protection structure includes a protection unit, and the support cover includes at least one row of hooking units, each of the hooking units includes a first hooking member and a second hooking member which are hooked to each other in sequence from the proximal end to the distal end, and a hooking gap is formed between the trough of the first hooking member and the crest of the second hooking member so that the trough of the first hooking member and the crest of the second hooking member can move relative to each other in the axial direction; the protection unit is provided on at least one of the hooking units.

34. The groove bracket according to claim 33, characterized in that: The protection structure includes a first protection unit and / or a second protection unit. The first protection unit is arranged on a side of the first hooking member where the trough faces the hooking gap, and the second protection unit is arranged on a side of the second hooking member where the crest faces the hooking gap.

35. The groove bracket according to claim 33, characterized in that: A first protection unit is provided on the side of the trough of the first hooking member facing the hooking gap, and a second protection unit is provided on the side of the crest of the second hooking member facing the hooking gap, the first protection unit and the second protection unit jointly shield part of the hooking gap, and a through hole is formed between the first protection unit and the second protection unit; the trough of the first hooking member and the crest of the second hooking member can move away from each other in the axial direction to drive the through hole to expand for the insertion of the outer branch bracket, and in the naturally expanded state, the area of ​​the through hole is smaller than the cross-sectional area of ​​the outer branch bracket.

36. A groove bracket according to any one of claims 29 to 35, characterized in that The protection structure includes a protection unit, and the protection unit includes one or more of a sheet structure, a strip structure, and a block structure.

37. The groove bracket according to claim 34, characterized in that: At least one of the first protection unit and the second protection unit includes a main body sheet and an extension sheet, and both the main body sheet and the extension sheet are sheet-like structures. One end of the main body sheet is connected to the hook unit, and the other end extends into the hook gap and is connected to the extension sheet. The extension sheet has a free end, and the extension sheet extends toward the direction close to the bottom of the groove, and the free end of the extension sheet is located between the support cover and the bottom of the groove.

38. The groove bracket according to claim 34, characterized in that: At least one of the first protection unit and the second protection unit includes a sheet-like structure, and the sheet-like structure has a movable end, and the movable end includes a thin-walled area, the thickness of the thin-walled area is less than the thickness of other areas of the protection unit, when the outer branch bracket is inserted into the hooking gap from the outside toward the direction close to the groove, at least part of the thin-walled area is deformed relative to other areas of the sheet-like structure and extends toward the direction close to the bottom of the groove.

39. The groove bracket according to claim 38, characterized in that: The thin-walled area includes at least one crack-prone strip, which cracks to form a crack when the outer branch bracket is inserted into the hooking gap from the outside toward the bottom of the groove, and at least part of the area adjacent to the crack in the thin-walled area is deformed relative to other areas of the sheet structure and extends toward the bottom of the groove.

40. The groove bracket according to claim 33, characterized in that: The protective structure includes a first protective unit and a second protective unit, and the first protective unit and the second protective unit jointly cover the hooking gap; or, the protective structure includes a third protective unit, and the third protective unit includes a polymer film, and the polymer film completely covers one or more of the hooking gaps, and the trough of the first hooking unit and / or the crest of the second hooking unit can move relative to each other in the axial direction, and at least a partial area of ​​the support cover is provided with a socket.

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