Groove support and manufacturing method thereof

Abstract

The invention provides a groove support and a manufacturing method thereof.The groove support comprises a main body support and a supporting cover, the main body support is tubular and is provided with an inner cavity, the side face of the main body support is sunken towards the inner cavity to form a groove, and the groove comprises a groove bottom; the supporting cover is connected with the main body support, at least one part of the supporting cover and the bottom of the groove form a radial interval in the radial direction of the groove support, the supporting cover comprises a net-shaped structure formed by weaving weaving wires, the net-shaped structure comprises a plurality of deformable net holes, and the groove is communicated with the outside through the net holes; the net-shaped structure comprises a weaving starting end and a weaving tail end, and the weaving starting end and the weaving tail end are mutually fixed through a fixing piece. The groove support can reduce blocking of the supporting cover to the guide wire or the outer branch support.

Description

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 surgery for the treatment of vascular diseases such as aortic aneurysms and aortic dissections has problems such as large trauma, high mortality, long operation time, high incidence of postoperative complications and high surgical difficulty. The use of minimally invasive interventional surgery to treat vascular diseases has the advantages of small trauma, high safety and high effectiveness. Therefore, it has been recognized by doctors and patients and has become an important treatment method for vascular diseases. Interventional treatment refers to the use of a delivery system to implant a vascular stent into the patient's vascular disease segment. The implanted vascular stent can expand to support the narrowed occluded segment of the blood vessel or block the rupture of the vascular dissection, reduce the elastic retraction and reshaping of the blood vessel, maintain smooth blood flow in the lumen, and prevent vascular stenosis.

[0003] When an aneurysm or arterial dissection is located near a branch vessel on the aorta, a stent with a groove can be implanted. The groove corresponds to the branch vessel to ensure that the blood in the aorta enters the branch vessel through the groove, which can not only support the narrowed occluded segment of the vessel or block the rupture of the vascular dissection, but also keep the blood flow of the branch unobstructed. For blood vessels with narrow or twisted true lumen, a support cover can be set on the groove. The support cover has a good support effect and can avoid the lumen from squeezing the groove and compressing the operating space. However, the setting of the support cover is likely to cause obstruction to the guide wire or the external branch stent. Summary of the invention

[0004] In view of the deficiencies existing 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] 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;

[0007] 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.

[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 corner of the groove, and the fixing member is arranged 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 angle is connected to a hook unit, and the hook unit includes a first hook member and a second hook member that are relatively movable in the axial direction.

[0012] In one of the embodiments, 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.

[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 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.

[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 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%.

[0018] In one embodiment, the braiding start end and the braiding tail end are fixed in the fixing member, 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.

[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 part 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 frame;

[0023] Wherein, the manufacturing method of 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 start end and the braiding tail end of the braiding wire are fixed to each other through a fixing piece.

[0027] In one of the embodiments, 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.

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

[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 the first direction braiding units and the second direction braiding units adjacent to each other.

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

[0033] 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;

[0034] 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.

[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 mesh cover includes a mesh structure woven by 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.

[0037] In one embodiment, the mesh 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 connectors are not provided with a protective structure.

[0038] In one embodiment, the protection structure includes a protection 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 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.

[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 of the embodiments, 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.

[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 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, 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.

[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 hooking gap from the outside toward the bottom of the groove, and at least a part of the area adjacent to the crack in the thin-walled area is deformed relative to other areas of the sheet-like 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 as follows: compared with the prior art, the support cover of the present invention includes a mesh structure woven from braided wires, the mesh structure includes a plurality of deformable mesh holes, and the mesh holes 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 a fixing piece, 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] Figure 1 It is a schematic diagram of the implantation state of the groove stent of the present invention;

[0048] Figure 2 It is a schematic structural diagram of a groove bracket according to the first embodiment of the present invention;

[0049] Figure 3 It is a schematic diagram of the structure of the groove of the first embodiment of the present invention;

[0050] Figure 4 It is a schematic diagram of the expansion of the support cover according to one embodiment of the present invention;

[0051] Figure 5 It is a schematic diagram of a support cover unfolded in another embodiment of the present invention;

[0052] Figure 6 A schematic diagram of a protection structure according to an embodiment of the present invention;

[0053] Figure 7 is a schematic diagram of a protection structure according to another embodiment of the present invention;

[0054] Figure 8A three-dimensional structural diagram of a support cover according to an embodiment of the present invention;

[0055] Fig. 9 for Figure 8 A partial enlarged view of position A in the middle;

[0056] Fig.10 for Figure 8 A partial enlarged view of position B in the middle;

[0057] Fig.11 for Figure 8 A partial enlarged view of the middle C position;

[0058] Fig.12 for Figure 8 A partial enlarged view of the middle D position;

[0059] Fig.13 A schematic diagram of a protective structure in another embodiment of the present invention;

[0060] Fig.14 A schematic diagram of a protective structure in another embodiment of the present invention;

[0061] Fig.15 It is a structural schematic diagram of a hook unit in one embodiment of the present invention;

[0062] Fig.16 It is a three-dimensional schematic diagram of the proximal region of the groove according to an embodiment of the present invention;

[0063] Fig.17 for Fig.16 A partial enlarged view of the E position in the middle;

[0064] Fig.18 This is a schematic diagram of the structure of a protection unit in Embodiment 2 of the present invention;

[0065] Fig.19 for Fig.18 Schematic diagram of the truncation at FF in the middle;

[0066] Fig. 20 This is a schematic diagram of the structure of a protection unit in Embodiment 3 of the present invention;

[0067] Fig.21 Schematic diagram of the structure of the protection unit in the fourth embodiment of the present invention;

[0068] Fig. 22 A schematic diagram of the structure of a protection unit in another embodiment of the present invention;

[0069] Fig.23 Schematic diagram of the position of the fixing member in the support cover in the fifth embodiment of the present invention;

[0070] Fig.24This is a schematic diagram of fixing a braiding start end and a braiding end end in a fixing member in Embodiment 5 of the present invention;

[0071] Fig.25 A schematic diagram of the position of a fixing member in a support cover in another embodiment of the present invention;

[0072] Fig.26 A schematic diagram of the position of a fixing member in a support cover in another embodiment of the present invention;

[0073] Fig. 27 Schematic diagram of the cooperation between the fixing member and the groove in the fifth embodiment of the present invention;

[0074] Fig.28 It is a partial enlarged schematic diagram of the area where the fixing member is located in the fifth embodiment of the present invention;

[0075] Fig.29 for Fig.28 A partial enlarged schematic diagram of the area where the fixing parts are located;

[0076] Fig.30 This is a schematic diagram of a weaving path of a mesh structure in Embodiment 5 of the present invention;

[0077] Fig.31 It is a schematic diagram of the structure of a groove bracket in one embodiment of the present invention;

[0078] Fig.32 is a partial structural schematic diagram of a groove bracket provided by an embodiment of the present invention;

[0079] Fig.33 It 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 describes the implementation methods of the present invention in detail with reference to the accompanying drawings. The following specific embodiments are only some embodiments of the present invention and are not intended to limit the present invention.

[0081] For ease of description, spatial 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 figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0082] In order to more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined here as commonly used terms in the field of interventional medicine. Specifically, "distal end" refers to the end where blood flows out, and "proximal end" refers to the end where blood flows in. For example, after the stent is implanted, blood flows from the proximal end of the stent to the distal end; "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0083] The "wave ring" (also called a waveform ring) in the present invention is a closed ring structure, and the "wave unit" is an arc structure. The "wave ring" and "wave unit" are made of metal elastic materials or polymer materials by weaving or cutting. 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, and 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) one or more kinds of blends or copolymers of at least two monomers, and can also be starch, cellulose, polysaccharide, chitin, chitosan or its derivatives and other biocompatible materials. The "wave ring" and "wave unit" both have radial expansion ability, can achieve radial contraction under the action of external force, and self-expand after the external force is removed or through mechanical expansion (for example, through balloon expansion) to restore to the initial shape and maintain the initial shape, so that after implantation into the lumen, it can be closely attached to the inner wall of the lumen through its radial support force. The waveform of the wave in the "wave ring" and "wave unit" is not limited, including Z-shaped wave, M-shaped wave, V-shaped wave, sine wave, etc. "Wave loop" and "wave unit" both include multiple wave crests (also called proximal vertices), multiple wave troughs (also called distal vertices), and wave rods connecting adjacent wave crests and wave troughs. Among them, a vertex (proximal vertex or distal vertex) and two wave rods connected to the vertex form a wave.

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

[0085] Embodiment 1

[0086] See also Figure 1 The groove stent 100 of this embodiment is used for implantation in a target cavity. The target cavity can be any cavity in a living body, and the present invention does not limit the type of the target cavity. For ease of understanding, the present invention uses the aortic arch 500 as an example of the target cavity. Figure 1The aortic arch 500 is connected to three branch vessels 200, and the branch vessels 200 are connected to the greater curvature side of the aortic arch 500. Blood flows from the aortic arch 500 to the branch vessels 200, and an aneurysm 400 is formed on the lesser curvature side of the aortic arch 500 (for illustration only, in other cases, the aneurysm 400 may be distributed at other positions of the aortic arch 500). The groove stent 100 is implanted in the aortic arch 500 to isolate the aneurysm 400, so that the blood flowing in the groove stent 100 cannot contact the aneurysm 400, and finally the purpose of treating the aneurysm 400 is achieved. The outer branch stent 300 can also be implanted in the three branch vessels 200, and the outer branch stent 300 is connected to the groove stent 100, and the blood in the groove stent 100 enters the branch vessels 200 through the outer branch stent 300.

[0087] See also Figure 2 and Figure 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 support 10 is a hollow tubular structure with openings at both ends, and its side is concave toward its inner cavity to form a groove 5, and the groove 5 includes a groove bottom 51 and a groove opening 52, wherein the groove opening 52 and the groove bottom 51 are arranged oppositely in the radial direction of the groove support 100, and the groove opening 52 faces the radial outside of the groove support 100. The support cover 4 is connected to the groove 5, and at least a part of the support cover 4 and the groove bottom 51 form a radial interval in the radial direction of the groove support 100, and the radial interval is connected to the inner cavity of the main support 10. In this embodiment, the central angle corresponding to the projection of the support cover 4 on the radial plane of the groove support 100 can be less than or equal to 180 degrees, for example, 120 degrees, so that the support cover 4 has a good radial support force and ensures that there is enough space in the inner cavity of the main support 10 for blood to flow through. In other embodiments, the middle section 7 can be concave as a whole, and the support cover 4 is tubularly sleeved outside the middle section 7.

[0089] Exemplarily, the main body support 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] See also Figure 2The main stent 10 can be divided 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 along the axial direction; the proximal section 2 includes a tubular proximal support portion and a proximal main body coating, and the proximal main body coating can be covered on the inner surface and / or outer surface of the proximal support portion by suturing, bonding, hot melting, etc. The proximal support portion includes a plurality of axially spaced main body waves 101; the distal section 1 includes a tubular distal support portion and a distal main body coating, and the distal support portion includes a plurality of axially spaced main body waves 101, and the distal main body coating can be covered on the inner surface and / or outer surface of the distal support portion by suturing, bonding, hot melting, etc.

[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 formed by the intermediate main body coating 31 is connected to the inner cavity formed by the proximal main body coating and the inner cavity formed 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 opening of the arc-shaped corrugated unit faces 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 direction 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, which 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 two sides of the support cover 4 in the radial direction are fixedly connected to the middle main body coating by suturing, bonding, hot melting, etc., and a radial interval (or gap, space, 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 can be arranged in the proximal section 2 and / or the distal section 1, and the inner cavity of the inner branch stent 6 is connected to the inner cavity of the main stent 10, and is connected to the radial interval formed between the groove bottom 51 and the support cover 4; wherein, a plurality of inner branch stents 6 can be arranged, for example, inner branch stents 6 are arranged at the proximal position close to the groove 5 and at the distal position close to the groove 5, respectively.

[0093] See also Figure 2 and Figure 4In 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 the 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. The support cover 4 can be formed by weaving a braided wire made of shape memory alloy or other materials, or it can be woven separately and then spliced. In other embodiments, the mesh structure 4a of the support cover 4 may 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 a plurality of wavy rings arranged at intervals in the axial direction.

[0094] Please refer to 6 at the same time. The surface of at least part of the support cover 4 is provided with a protective structure 70. For example, the surface of the braided wire 40 of at least part of the support cover 4 is provided with a protective structure 70. The protective structure 70 includes one or more protective layers 71 of a metal layer, a polymer layer, a ceramic layer and a composite material layer. Among them, the composite material layer can be made of one or more of metal, polymer, and ceramic. For the metal layer, it 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 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, gold and its alloys, etc. One or more metal materials; for the polymer layer, the polymer raw material can be covered on the surface of the support cover 4 by coating, spraying, spin coating, melting, dipping, etc. to form a film, or the polymer film layer can be wrapped on the surface of the braided wire 40 by suturing, gluing, hot melting, etc., or any other suitable method can be used to set the polymer layer on the surface of the braided wire 40. 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 ceramic material currently known to be applicable to the human body can be selected, and 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 surface of the braided wires 40 of the mesh body 4b is provided with a protective structure 70. Figure 7During the manufacturing process, the surfaces of the braided wires 40 in the mesh body 4b are all wrapped with strips 711 (e.g., PTFE strips). For example, the strips 711 can be spirally wrapped around the surfaces of the braided wires 40 to completely cover the surfaces of the braided wires 40 in the mesh body 4b. Next, the support cover 4 wrapped with the strips 711 is heat-treated to melt the strips 711 on the surfaces of the braided wires 40. In other embodiments, a bioceramic layer can be electroplated on the surfaces 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 set in any other suitable manner.

[0096] This arrangement enables the overlapping points between all the braided wires 40 in the mesh body 4b and the inner walls of all the meshes to be provided with a protective structure 70. Not only can the risk of damage to the braided wires 40 at the overlapping points of the braided wires 40 that are more prone to mutual friction be reduced, but it is also beneficial to protect the mesh and the outer branch stent 300 inserted into the mesh, and the risk of damage to the mesh or the outer branch stent 300 caused by mutual friction between the mesh and the outer branch stent 300 inserted therein can be reduced to a certain extent. In other embodiments, the mesh body 4b may be only partially provided with a protective structure 70, for example, only at the overlapping points of some or all of the braided wires 40, the surface of the braided wire 40 is provided with a protective structure 70, and the inner wall of the mesh is not provided with a protective structure 70; or, only at the inner wall of some or all of the meshes is provided with a protective structure 70, and no protective structure 70 is provided at the overlapping points of the braided wires 40; or, only at the overlapping points of some of the braided wires 40, the surface of the braided wire 40 is provided with a protective structure 70, and the inner wall of some of the meshes is provided with a protective structure 70.

[0097] In this embodiment, the protective structure 70 is not provided in part or all of the side connector 46 of the support cover 4. Exemplarily, the side connector 46 is fixedly connected to the main support 10, for example, connected to the main coating 31 of the main support 10 by suturing, so the relative position between the side connector 46 and the main support 10 is relatively fixed, the relative movement is less, and the probability of relative friction is low, so the protective structure 70 may not be provided in at least part of the side connector 46. In addition, if a protective structure 70 having a surface smoothness higher than that of the bare side connector 46 is provided on the surface of the side connector 46, and the side connector 46 is sutured to the main support 10, it is easy to cause relative slippage between the side connector 46 and the main support 10, thereby causing relative displacement between the support cover 4 and the main support 10. Therefore, not providing the protective structure 70 on the side connector 46 is also conducive to reducing the probability of relative displacement between the support cover 4 and the main support 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, refer to Figure 8 and Fig. 9 In this embodiment, the side connector 46 is roughly triangular, including two waists 461, a bottom edge 462 connecting the two waists 461, and a connecting hole 46a formed by the waist 461 and the bottom edge 462. The connecting hole 46a can be used as a suture hole for fixed connection with the covering or the support body 10 by suture. The connecting hole 46a can not only facilitate the suture operation, but also play a limiting role to reduce the relative slip between the suture and the support cover 4. In this embodiment, the connecting hole 46a is a closed (or closed-loop) hole, so it is conducive to further improving the limiting effect. In other embodiments, the connecting hole 46a can be an open hole. In other embodiments, the connecting hole 46a may 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 the two waists 461 overlap each other at this vertex. Among them, the bottom edge 462 can be connected to the edge of the groove 5 by suturing or bonding, and the overlapping part of the two waists 461 can slide relatively, which is conducive to further increasing the expansion size of the side mesh of the support cover 4. A protective structure 70 can be set 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 suturing and fixing with 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 the connection, and at the same time reduce 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, but the protective structure 70 is not provided on the bottom edge 462, and the bottom edge 462 is sutured to the edge of the groove 5. The two waists 461 provided with the protective structure 70 can better limit the stitches on the bottom edge 462, and can better reduce the probability of a large relative displacement between the side connector 46 and the main support 10. In other embodiments, the side connector 46 can be other shapes, for example, the side connector 46 can also be any other suitable shape such as a teardrop shape, a circle, an ellipse, etc.

[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] See also Figure 4 The support cover 4 includes a first mesh area 41, the first mesh area 41 includes at least one row of hook units 47, each row of hook units 47 includes a plurality of hook units 47 arranged in sequence axially, each hook unit 47 includes a first hook member 471 and a second hook member 472, and the first hook member 471 and the second hook member 472 are formed by bending the braided wire 40. The first hook member 471 includes a wave that bulges toward the distal direction, that is, includes a wave trough 4711 (also called the distal vertex) and two first wave rods 4712 connected to the wave trough 4711; the second hook member 472 includes a wave that bulges toward the proximal direction, that is, includes a wave crest 4721 (also called the proximal vertex) and two second wave rods 4722 connected to the wave crest 4721. In this embodiment, the first hook member 471 and the second hook member 472 of each hook unit 47 are hooked with each other roughly along the axial direction. It should be noted that "substantially 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 roughly 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] Reference Figure 4 , Fig.13 In this embodiment, the protection structure 70 further includes a protection unit 72. The protection unit 72 is provided on at least one hook unit 47. The protection unit 72 can be fixedly connected to the hook unit 47 by suturing, gluing, hot melting, etc. Since the area of ​​the hook gap G is smaller than the area of ​​other meshes (other types of meshes except the hook gap G) in the mesh structure 4a, if the guide wire is selected from the hook gap G and guides the outer branch stent 300 to be inserted therein, the outer branch stent 300 inserted therein may be subjected to a larger extrusion force of the hook gap G, and the friction between the two is larger. By providing the protection unit 72 on the inner wall of the hook gap G, it is helpful to reduce the probability of the outer branch stent 300 being damaged by extrusion and friction. It can be understood that in other embodiments, only the protection unit 72 can be provided without the protection layer 71, or only the protection layer 71 can be provided without the protection unit 72.

[0104] Exemplarily, the protection structure 70 further includes a first protection unit 721 and a second protection unit 722. The first protection unit 721 is disposed on the side of the trough 4711 of the first hooking member 471 facing the hooking gap G, and the second protection unit 722 is disposed on the side of the crest 4721 of the second hooking member 472 facing the hooking gap G. The first protection unit 721 and the second protection unit 722 can jointly shield at least a portion of the hooking gap G, thereby reducing the probability that the guide wire passes through the hooking gap G and guides 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, in the subsequent use process, the first protection unit 721 and the second protection unit 722 can also well protect the hooking unit 47 and the outer branch stent 300, and can improve the process of endothelialization of the support cover 4, thereby reducing the risk of damage to the outer branch stent 300 caused by the friction and cutting force between the two. When the first protection unit 721 and the second protection unit 722 only cover part of the hooking gap G together, a through hole 723a may be formed between the first protection unit 721 and the second protection unit 722, and the trough 4711 of the first hooking member 471 and the crest 4721 of the second hooking member 472 may move in the axial direction away from each other to drive the through hole to expand for the insertion of the outer branch stent 300, and in the naturally unfolded 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 may completely cover the hooking gap G, for example, the adjacent edges of the first protection unit 721 and the second protection unit 722 fit each other, or the first protection unit 721 and the second protection unit 722 have an overlapping area, and the hooking gap G is completely blocked together to prevent the guide wire and the outer branch stent 300 from being inserted into the hooking gap G.

[0105] The first protection unit 721 and the second protection unit 722 include one or more of a sheet structure, a strip structure, and a block structure. Fig.13In this embodiment, the first protection unit 721 and the second protection unit 722 both include a sheet structure, which can be made of one or more polymer materials selected from PTFE, PET, ePTFE, FEP, L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, polyhydroxyalkanoic acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone. For example, the first protection unit 721 includes a first sheet structure 7211, and the second protection unit 722 includes a second sheet structure 7221. The first sheet structure 7211 and the second sheet structure 7221 jointly shield at least a portion of the hook 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 is conducive to better shielding the hook gap G, so as to reduce the probability of the outer branch stent 300 being inserted into the hook gap G. In addition, the sheet structure can prevent the outer branch stent 300 inserted into the hook gap G from being squeezed into the narrow space near the trough 4711 of the first hook member 471 and the crest 4721 of the second hook member 472 to a certain extent, thereby causing excessive deformation, and the sheet structure can provide a good buffer, which can well reduce the risk of damage to the outer branch stent 300 caused by the friction and cutting force between the outer branch stent 300 and the hook unit 47. When the sheet structure is made of a degradable material, after the groove stent and the outer branch stent 300 are endothelialized, the sheet structure can be gradually degraded and absorbed by the organism, thereby providing a larger accommodation space for the outer branch stent 300 inserted therein.

[0106] In the present embodiment, a through hole 723a is formed between one end of the first sheet structure 7211 farther from the trough 4711 and one end of the second sheet structure 7221 farther from the crest 4721. The edge of one end of the first sheet structure 7211 farther from the trough 4711 is roughly in the shape of an arc bent toward the direction close to the trough 4711, and the edge of one end of the second sheet structure 7221 farther from the crest 4721 is roughly in the shape of an arc bent toward the direction close to 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 lateral direction) of the support cover 4 is larger than that 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 guide 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 larger than the diameter of the guide wire, 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 guide wire referred to here refers to the guide wire 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 larger than the diameter of the guide wire is that it provides space for relative movement of the first hook 471 and the second hook 472, 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 guide wire. Such a setting is conducive to blocking the guide wire from entering the through hole 723a, thereby reducing the probability of the outer branch stent 300 being inserted therein. In other embodiments, no through hole 723 a may be formed between the first sheet structure 7211 and the second sheet structure 7221 , but the hooking gap G is completely covered together.

[0108] Reference Fig.14In other embodiments, both the first protection unit 721 and the second protection unit 722 include strip structures. For example, the first protection unit 721 includes a first strip structure 7212, and the second protection unit 722 includes a second strip structure 7222. The first strip structure 7212 and the second strip 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 two ends of the first strip structure 7212 in the length direction are respectively connected to the two first wave rods 4712 of the first hooking member 471, and the two ends of the second strip structure 7222 in the length direction are respectively connected to the two second wave rods 4722 of the second hooking member 472. The first strip structure 7212 and the second strip structure 7222 may extend substantially in parallel, or not in parallel. 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 member 471 and the crest 4721 of the second hook member 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 hooking unit 47, and the strip structure has less restriction on the relative movement between the first hook member 471 and the second hook member 472, and the first hook member 471 and the second hook member 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 beneficial to accelerate 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 the friction and cutting force between the external branch stent 300 and the hook unit 47 can be further reduced.

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

[0110] For further information, see Fig.15In 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, and the two first wave bars 4712 of the first hook member 471 are connected by the crossbar 473, and the two second wave bars 4722 of the second hook member 472 are connected by the crossbar 473. The crossbar 473 is conducive to further expanding the size of the mesh formed by the hook gap G, so that the hook gap G is more suitable as a mesh for the external branch stent 300 to enter; in addition, in the case where the crossbar 473 is not provided, the two wave bars are directly connected, and the wave crest 4721 or the wave trough 4711 formed by the connection has a sharper wave angle. When the support cover 4 is bent with the tubular stent, it will be lifted on the curved surface. Under long-term use, the wave angle will scratch the inner wall of the blood vessel, causing unnecessary damage. Therefore, the crossbar 473 can reduce 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, which can not only expand the area of ​​the hook gap G and protect the inner wall of the blood vessel, but also 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 used, an arc transition is used 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 small, and the preferred curvature range can be 60° to 140°.

[0112] See also Figure 4 In this embodiment, the support cover 4 further includes a second mesh area 42 connected to the first mesh area 41. Both the first mesh area 41 and the second mesh area 42 can realize radial contraction under the action of external force, and recover to the initial shape and maintain the initial shape by self-expansion or mechanical expansion (for example, by balloon expansion) after the external force is removed; preferably, along the circumference of the groove stent 100, the support cover 4 includes the second mesh area 42 and two first mesh areas 41 respectively connected to the radial sides of the second mesh area 42.

[0113] The second mesh area 42 includes a plurality of first-direction support wires 481 arranged at intervals and a plurality of second-direction support wires 482 arranged at intervals, and the first-direction support wires 481 and the second-direction support wires 482 are both braided wires 40. The first-direction support wires 481 extend approximately along the first direction, and the second-direction support wires 482 extend approximately along 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 columns of meshes and multiple columns of cross units 48. Each column of meshes includes a plurality of meshes arranged approximately along the axial direction. Each column of cross units 48 includes a plurality of cross units 48 arranged approximately along the axial direction. The mesh is roughly rhombus-shaped, or it can be other shapes such as squares and rectangles; four cross units 48 are correspondingly arranged at the positions of 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 which 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 located on the outside of the second direction support wire 482, or the first direction support wire 481 is 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 each other and can move relatively, 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 a certain support and limit effect on the outer branch stent 300, reduce the situation where the outer branch stent 300 swings with blood or heart beats, and ensure the stability of branch blood supply.

[0114] See also 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. Figures 8 to 12When the first hook member 471 is hooked with the second hook member 472 to form a hook unit 47, the hook unit 47 in the proximal cover 43 is different from the hook unit 47 in the distal cover 45. In the proximal cover 43, the first wave rod 4712 on the radial edge side of the support cover 4 in the same hook unit 47 crosses over 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 hook unit 47 crosses over the first wave rod 4712. Among them, the upper side refers to the side that is farther away from the inner cavity of the main support 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 support 300 enters the groove 5 from the mesh on the proximal cover 43 and then connects with the inner branch support 6 located in the proximal section 2, since the first wave rod 4712 on the radial edge 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 support 100, thereby having better ability and space for upward deformation, 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 support 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 support 300, thereby reducing the occurrence of the outer branch support 300 swinging with the 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 member 471 and the second hook member 472 will be twisted together at the hooking position, which is not conducive to the expansion and deformation of the mesh 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 close to the radial edge of the support cover 4 spans over the top of 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 the present embodiment. In other embodiments, the second mesh area 42 may be similar to the structure of the first mesh area 41 of the present 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] See also Figure 4, further, in one embodiment, the first wave bar 4712 and the second wave bar 4722 of the hook unit 47 close to the radial edge of the support cover 4 form an axial interval, and the maximum axial lengths of the axial intervals formed by the same row of hook units 47 may be equal or unequal. Exemplarily, in this embodiment, the maximum axial lengths of the axial intervals formed by the same row of hook units 47 are unequal. For example, the multiple axial intervals formed between the multiple hook units 47 include end intervals and middle intervals, and the end intervals are closer to the axial end of the support cover 4 than the middle intervals, and the maximum axial length of at least one end interval ( Figure 4 L1 shown) is greater than the maximum axial length of the intermediate interval ( Figure 4 L2 shown), 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 stent 6 is only provided near one axial end of the support cover 4, it is sufficient as long as the maximum axial length of the end interval near the 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 greater 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 hook 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 hook unit 47 passes over the top of the first wave rod 4712, so as to achieve the effect that the mesh on the radial side of the support cover 4 can be easily expanded and deformed.

[0118] Reference Figure 4, the side connecting members 46 are connected to the hooking units 47. For example, the side connecting members 46 are respectively connected to two axially adjacent hooking units 47, and 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, and 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] Reference Figure 4 , Figure 8 In this embodiment, the support cover 4 further includes a side end connector 42a disposed at the axial end of the support cover 4. For example, the distal end and the proximal end of the support cover 4 are both provided with a side end connector 42a, and the side end connector 42a is used to connect with the edge of the groove 5. The side connector 46 is disposed between the side end connector 42a at the distal end of the support cover 4 and the side end connector 42a at the proximal end of the support cover 4, and the side end connector 42a is spaced apart from the side connector 46. By providing the side end connector 42a, the support cover 4 can better follow the bending deformation of the main support 10, so as to better fit the blood vessel and provide support for the groove 5. In addition, in this embodiment, the side end connector 42a includes an edge wave angle 421 that bulges toward the axial end of the support cover 4, and is connected to the main support 10 through the edge wave angle 421, for example, it can be fixedly connected by suturing, bonding, etc., because the vertex 4211 of the edge wave angle 421 itself does not form a closed connection hole structure, it can not only reduce the sheath size at the corner of the support cover 4, but also make the edge wave angle 421 and the hook unit 47 adjacent thereto form a larger polygonal mesh, and the polygonal mesh size is larger, so it is conducive to the guide wire and the outer branch stent 300 to enter from 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, which is conducive to increasing the size of the side mesh near the axial end of the support cover 4, facilitating the entry of the guide wire 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 5The plurality of side connecting members 46 include two first side connecting members 46a and a second side connecting member 46b located between the two first side connecting members 46a. The second side connecting member 46b is connected to a first hook member 471 and a second hook member 472 respectively. The first side connecting piece 46a is axially connected to the side end connecting piece 42a and the hook unit 47, respectively. Exemplarily, the first side connecting piece 46a near the proximal end of the support cover 4 is axially connected to the side end connecting piece 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 near the proximal end of the support cover 4, and then reversely bends to form the first side connecting piece 46a, and then is connected to the side end connecting piece 42a located at the proximal end of the support cover 4; the first side connecting piece 46a near the distal end of the support cover 4 is axially connected to the side end connecting piece 42a and the second hook 472 located at the distal end of the support cover 4, respectively. For example, in the second hook 472 of the hook unit 47 located at the farthest end, the second wave rod 4722 near the radial edge of the support cover 4 (also refer to Figure 4 ) continues to extend in the direction close to the distal end of the support cover 4, and then bends in the opposite direction to form a first side connection piece 46a, and then connects to the side end connection piece 42a located at the distal end of the support cover 4. In this embodiment, the side end connection piece 42a includes an edge wave angle 421 that bulges toward the axial end of the support cover 4. The edge wave angle 421 and the hook unit 47 adjacent thereto form a polygonal mesh. The size of the polygonal mesh is relatively large, so it is convenient for the guide wire and the outer branch stent 300 to enter through the mesh. Furthermore, since the side end connector 42a of the present 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 corner of the support cover 4 not be increased, but a larger mesh hole 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 out to damage biological tissue when the support cover 4 is compressed 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 two adjacent second side connectors 46b, which is conducive to increasing the size of the side mesh of the support cover 4 close to its axial end, facilitating the entry of the guide wire 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 roughly equal to the maximum spacing distance between two adjacent second side connectors 46b.

[0123] See also Figure 4 , Figure 8 , Fig.12 The support cover 4 of this embodiment further includes a bending portion 422, the bending portion 422 includes a first rod 4222 and a second rod 4223 connected to each other, a bending angle 4221 is formed between the first rod 4222 and the second rod 4223, the first rod 4222 extends from the bending angle 4221 toward 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. Since the first rod 4222 and the second rod 4223 of the bending portion 422 extend toward opposite axial ends of the support cover 4, respectively, when the support cover 4 is radially squeezed by the vessel wall and bends in accordance with the vessel shape, the first rod 4222 and the second rod 4223 forming the bending angle 4221 can move relative to each other relative to the straight rod, so that the bending portion 422 can bulge in a direction away from the groove 5, and the support cover 4 is more likely to form an arch in this area, avoiding compression of the space in the groove 5, and facilitating the guide wire and the outer branch stent 300 to enter the groove 5. Especially when the bending angle 4221 formed by the bending portion 422 is an obtuse angle, the relative activity space between the first rod 4222 and the second rod 4223 is increased, and the deformation can be more flexible. When the bending portion 422 bulges in the direction away from the groove 5, it can avoid forming a sharp structure to damage the blood 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, thereby 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. Such a setting can make the mesh size of its attachment 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 far away.

[0126] The first rod 4222 of the bent portion 422 extends from the bent angle 4221 toward a direction close to one axial end of the support cover 4, and the second rod 4223 extends from the bent angle 4221 toward a direction close to the other axial end of the support cover 4. At the same time, the first rod 4222 of the bent portion 422 extends toward a direction close to one radial edge of the support cover 4, and the second rod 4223 extends toward a direction close to the other radial edge of the support cover 4. The advantage of such a configuration is 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, so that the bent portion 422 can better conform to the radial deformation of the support cover 4 and can better conform to the bending deformation of the support cover 4 in the axial direction.

[0127] One end of the first rod 4222 of the bending 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, refer to Figure 4 , Figure 8 , Fig.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 extend 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 sheath and have good safety. The edge wave angle 421 and the side angle 53 of the groove 5 (refer to Fig.16 ) connection, for example, the vertex 4211 of the edge wave angle 421 is connected to the corner 53 of the groove 5, so 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 bending portion 422 passes through the second mesh area 42 and is connected to the vertex of the first hook 471 or the second hook 472 on the opposite side. For example, a part of the second rod 4223 serves as the supporting wire of the second mesh area 42, and a part of the second rod 4223 serves as the wave rod of the hook unit. This arrangement enables the vertex of the first hook 471 or the second hook 472 to provide a certain supporting force for the second rod 4223. When the groove 5 support cover 4 is subjected to radial force, the end of the second rod 4223 away from the bending angle 4221 can better transmit the radial force, so that the second rod 4223 can more sensitively follow the deformation of the support cover 4. In addition, since the second rod 4223 passes through the second mesh area 42 and comes to the opposite side, the first rod 4222 and the second rod 4223 can respectively transmit the extrusion force on both sides of the radial direction of the support cover 4, thereby adaptively deforming and well maintaining the space in 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; the 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] Reference Figure 5 In another embodiment, the support cover 4 further comprises a side end connector 42a and a middle end connector 41a connected to the main stent 10, and the side end connector 42a is closer to the radial edge of the support cover 4 than the middle end connector 41a. Compared with the solution in which the middle end connector 41a is not connected to the main stent, since the middle end connector 41a is connected to the main stent 10, when the main stent 10 is bent, the support cover 4 can be better driven to bend and deform in accordance with the shape of the blood vessel, and the middle end connector 41a connected to the main stent 10 can also provide better support for the axial end of the groove 5, so as to avoid the main stent 10 and the middle end connector 41a from forming a gap in the axial direction when the groove stent 10 is bent, thereby preventing the inner wall of the blood vessel with a narrow true lumen from squeezing the gap and entering the internal space of the groove 5 from the gap, thereby blocking the guide wire and the outer branch stent 300 from entering the inner branch stent 6.

[0132] Further, the middle end connector 41a at the proximal end of the support cover 4 is closer to the proximal end of the groove bracket 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 bracket 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 arch structure after following the bending of the main bracket 10, and can effectively prevent the axial end of the support cover 4 from forming an approximate plane when the main bracket 10 is bent, better maintain the internal space of the groove 5, facilitate the guide wire and the outer branch bracket 300 to enter the groove, and avoid excessive squeezing of the outer branch bracket 300 after the outer branch bracket 300 is implanted.

[0133] For example, refer to Figure 5 , Fig.16 , the middle end connecting piece 41a includes a middle wave angle 411, and the side end connecting piece 42a includes an edge wave angle 421. The vertex 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 vertex 4211 of the edge wave angle 421, and the vertex 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 vertex 4211 of the edge wave angle 421. Compared with the solution in which the vertex 4112 of the middle wave angle 411 is flush with the vertex 4211 of the edge wave angle 421 (see Figure 4 ), after the support cover 4 is bent, the middle wave angle 411 protrudes for a long length, 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 angles 421 are located, which is conducive to the guide wire and the outer branch stent 300 passing through these meshes. Furthermore, the middle middle wave angle 411 provides a sufficient stretching length, which can ensure that the proximal and distal ends of the support cover 4 will not be stretched and deformed too much toward the inner cavity direction of the groove 5, and can effectively avoid the axial end of the support cover 4 from forming a nearly flat surface when the main support 10 is bent, but form a better arched structure, thereby effectively maintaining the internal space formed by the support cover 4 and the groove 5 at the proximal and distal ends.

[0134] In other embodiments, similar Figure 4 The apex 4112 of the middle wave angle 411 is flush with the apex 4211 of the edge wave angle 421 ; alternatively, the apex 4211 of the edge wave angle 421 is 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, specifically Figure 5 , Fig.16 and Fig.17 As shown, the middle wave angle 411 includes two fourth wave rods 4113 connected to its vertex 4112, the vertex 4112 of the middle wave angle 411 is connected to one axial end of the groove 5, and the two fourth wave rods 4113 extend from the vertex 4112 of the middle wave angle 411 toward the other axial end of the groove 5. Further, the vertex 4112 of the middle wave angle 411 is opposite to the second mesh area 42 in the axial direction, and the two fourth wave rods 4113 extend from the vertex 4112 of the middle wave angle 411 in a direction away from each other to respectively connect with the first mesh area 41 on both radial sides of the second mesh area 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 unit 47, the mesh of the first mesh area 41 can be fully expanded when bent, thereby making it more convenient for the guide wire and the outer branch stent 300 to penetrate. At the same time, the hook unit 47 can limit the stretching length of the first mesh area 41 to a certain extent, and then limit the stretching length of the second mesh area 42 connected thereto, so as to avoid the problems such as the second mesh area 42 stretching too long and causing the compression of the internal space of the groove 5 and the mesh of the second mesh area 42 to shrink too small, so that the internal space of the groove 5 and the mesh shape 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] Reference Figure 5 , Fig.16 and Fig.17The two fourth wave rods 4113 of the middle wave angle 411 located at the proximal end of the support cover 4 extend from the vertex 4112 of the middle wave angle 411 toward directions away from each other to form the first wave rod 4712 of the two hooking units 47 on both sides of the radial direction of the support cover 4; the two fourth wave rods 4113 of the middle wave angle 411 located at the distal end of the support cover 4 extend from the vertex 4112 of the middle wave angle 411 toward directions away from each other to form the second wave rod 4722 of the two hooking units 47 on both sides of the radial direction of the support cover 4. The two fourth wave rods 4113 of the intermediate wave angle 411 may 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] Further, refer to Figure 5 , Fig.17 , the two fourth wave rods 4113 of the middle wave angle 411 respectively cross over the upper part of the bending part 422. In this embodiment, the two fourth wave rods 4113 of the middle wave angle 411 respectively cross over the upper part of the second rods 4223 of the two bending parts 422. In other embodiments, the two fourth wave rods 4113 of the middle wave angle can also cross over the upper part of the first rods 4222 of the two bending parts 422, as long as it is ensured that the two fourth wave rods 4113 of the middle wave angle 411 respectively cross over the upper part of the bending part 422. The advantage of such a setting is that when the support cover 4 is radially compressed or bent, the bending part 422 can bulge in the direction away from the groove 5, so as to lift up the fourth wave rod 4113 crossing over it, and avoid the middle wave angle 411 from being excessively stretched after the groove bracket 100 is bent to form a relatively flat structure. Therefore, the support cover 4 can better maintain the internal space of the groove 5 at the axial end, and avoid occupying the space near the opening of the inner branch bracket 6.

[0138] When the groove bracket 100 is in the expanded state, the fourth wave bar 4113 of the middle wave angle 411 and the bent portion 422 may contact each other; or, there is a gap between the fourth wave bar 4113 of the middle wave angle 411 and the bent portion 422 in the radial direction of the groove bracket 100; whether they contact each other or form a gap, the middle wave angle 411 can move relative to the bent portion 422, so that no matter whether the support cover 4 is bent or straight, it has better deformation ability and compliance, and can better maintain the internal space formed between the support cover 4 and the groove 5. When there is a gap between the fourth wave bar 4113 of the middle wave angle 411 and the bent portion 422 in the radial direction of the groove bracket 100, the gap formed can make the bent portion 422 have a larger activity space, which is conducive to the support cover 4 when bending in the direction away from the groove 5. It can better travel the arch structure, and is more conducive to the guide wire and the outer branch bracket 300 entering the inner branch bracket 6.

[0139] In one embodiment, the fourth wave rod 4113 of the middle wave angle 411 may be an arc rod 4111, and the arc rod 4111 is an arched curved structure that bulges upward, and the upward bulge here specifically bulges along the radial direction of the groove bracket 100 in a direction away from the central axis of the groove bracket 100, and the bulged arched curved structure can be more conducive to forming a gap between the middle wave angle 411 and the bent portion 422. Further, the arc rod 4111 of the arched curved structure can make the axial end of the support cover 4 follow the arc rod 4111 to form an arched structure after the support cover 4 is axially bent along with the bending of the main bracket 10, providing stronger support performance, so that the internal space of the groove 5 at the axial end position can be better maintained to prevent the internal space from being excessively squeezed.

[0140] See also Fig.16 and Fig.17The 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 to the inner wall of the proximal section 2 of the groove stent 100 by suturing or bonding side by side, and the two single-branch stents 62 are usually set to be approximately circular branch openings, and a gap position 612 is formed between the two branch openings, so that when the double-branch stent 61 is sutured to the proximal main body coating of the groove stent 100 at the proximal edge of the groove 5, the gap position 612 will form a blank section of the proximal main body coating, which is used to support the cover 4 to be installed to the groove 5 When, 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 middle wave angle 411 extends to the gap position 612, so that the apex 4112 of the middle wave angle 411 is closer to the proximal end of the groove bracket 100 than the proximal edge of the groove 5, and the middle wave angle 411 is connected to the proximal main body coating at the gap position 612. The advantage of such a setting is that the branch port 611 of the double-branch port bracket 61 can provide a certain support for the middle wave angle 411, thereby preventing the middle wave angle 411 from piercing the main body coating 31.

[0141] It can be understood that the intermediate end connector 41a can be connected to the main body coating 31 (see Figure 2 )'s inner wall or outer wall, for example, the apex 4112 of the intermediate wave angle 411 and a portion of the fourth wave rod 4113 extend to the inner wall of the main coating 31 at the gap position 612, that is, the main coating 31 at the gap position 612 covers the outer side of the apex 4112 and a portion of the fourth wave rod 4113 of the intermediate wave angle 411, and then the apex 4112 and a portion of the fourth wave rod 4113 of the intermediate wave angle 411 are connected to the inner wall of the main coating 31 by sewing; or, the main coating 31 at the gap position 612 covers the inner side of the apex 4112 and a portion of the fourth wave rod 4113 of the intermediate wave angle 411, and then the apex 4112 and a portion of the fourth wave rod 4113 of the intermediate wave angle 411 are connected to the outer wall of the main coating 31 by sewing. When the middle end connector 41a is connected to the inner wall of the main body coating 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 main stent 10 located at the proximal section 2 may not be a double-branch stent 61, while the inner branch stent 6 of the distal section 2 is a double-branch stent 61, so that the intermediate wave angle 411 located at the distal end of the support cover 4 can be connected to the main stent 10 with reference to the above-mentioned connection method. In other embodiments, the connection position and connection method of the intermediate wave angle 411 and the main stent 10 are not limited thereto, and a suitable connection position and connection method can be selected according to actual needs.

[0143] Furthermore, a support 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 part of the support is connected to the main body coating 31 and is located on both sides of the middle end connector 41a to better support the middle wave angle 411.

[0144] Embodiment 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] Reference Fig.18 , Fig.19 In this embodiment, at least one of the first protection unit 721 and the second protection unit 722 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 direction close to the bottom of the groove 51, and the free end 7241 of the extension sheet 724 is located between the support cover 4 and the bottom of the groove 51. The provision of the extension sheet 724 is conducive to increasing 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 spacing 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 blocking 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 body sheet 723 and the extension sheet 724 can be made of one or more polymer materials selected from the following materials: PTFE, PET, ePTFE, FEP, silica gel, L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, polyhydroxyalkanoic acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone, and any other suitable material can also be used. The main body 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 it 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 beneficial to improve 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, so as to better guide and promote endothelialization.

[0149] Embodiment 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] Reference Fig. 20 At least one of the first protection unit 721 and the second protection unit 722 includes a sheet structure, and the sheet structure has a movable end, and at least a part of the movable end can move relative to the hook unit 47. The movable end includes a thin-walled area, the thickness of which is less than the thickness of other areas of the protection unit 72, and when the outer branch bracket 300 is inserted from the outside to the direction close to the groove 5 into the hook gap G, at least part of the thin-walled area is deformed relative to other areas and extends toward the direction close to the groove bottom 51, thereby forming a structure similar to the extension sheet 724 in the second embodiment. This is conducive to increasing 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 thin-walled 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, causing the thrombus to quickly fill the groove 5, thereby blocking the groove 5, which is beneficial for providing support for the implanted external branch stent 300, preventing the external branch stent 300 from twisting and shifting, and is also beneficial for the groove 5 and the support cover 4 area to achieve rapid endothelialization, further reducing the risk of damage to the external branch stent 300 due to friction and cutting force.

[0152] In this embodiment, refer to Fig.21, the first protection unit 721 includes a third sheet structure 7213, and the second protection unit 722 includes a fourth sheet structure 7223. The third sheet structure 7213 has a first movable end 7214, and the first movable end 7214 includes a thin-walled area. The edge of the first movable end 7214 is the edge of the third sheet structure 7213 farther from the trough 4711. The edge of the first movable end 7214 is generally in the shape of an arc bent toward the direction close to the crest 4721. The fourth sheet structure 7223 has a second movable end 7224, and the second movable end 7224 includes a thin-walled area. The edge of the second movable end 7224 is the edge of the fourth sheet structure 7223 farther from the crest 4721. The edge of the second movable end 7224 is generally in the shape of an arc bent toward the direction close to the crest 4721. The shape of the edge of the second movable end 7224 matches the shape of the edge of the first movable end 7214, so as to completely cover the hooking gap G together. Such a configuration is conducive to making the thin-walled areas of the first movable end 7214 and the second movable end 7224 easier to deform relative to other areas of the sheet-like structure and extend toward the direction close to the bottom 51 of the groove when the outer branch stent 300 is inserted between the third sheet-like structure 7213 and the fourth sheet-like structure 7223. It can be understood that in other embodiments, the shape of the edge of the first movable end 7214 and the edge of the second movable end 7224 can be any other suitable shape, as long as the shapes match and they completely cover the hook gap G together, for example, both are straight, S-shaped, broken line, etc. In other embodiments, the thin-walled area of ​​the first movable end 7214 and the thin-walled area of ​​the second movable end 7224 can overlap in the radial direction of the groove 5 to completely cover the hook gap G together. In this case, the shape of the edge of the first movable end 7214 and the edge of the second movable end 7224 can be any suitable shape and does not necessarily match each other.

[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, refer to Fig. 20 , the thin-walled area may include at least one cracking strip 725, and the cracking strip 725 may be in any suitable shape such as a straight line, a curve, or a broken line. In this embodiment, the cracking strip 725 may be a thinner area than other areas of the thin-walled area, for example, an indentation obtained by hot pressing on the thin-walled area, and the area where the indentation is located is thinner than other areas of the thin-walled area. In other embodiments, a plurality of small holes may be arranged at intervals along the length direction of the cracking strip 725, which can also achieve the effect of easy cracking.

[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 90° to the axial direction of the groove bracket 100. When the crack of the crack strip 725 is formed, the sheet structure is at least divided into two pieces in the axial direction, and the piece closer to the edge of the movable end is easier to be driven by the inserted outer branch bracket 300 to deform in a direction close to the groove bottom 51.

[0156] The easy-to-break strip 725 of this embodiment breaks to form a crack when the outer branch stent 300 is inserted from the outside to the direction close to the groove bottom 51 into the hooking gap G, 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 direction close to the groove bottom 51. This arrangement is conducive to further improving the probability of the thin-walled area being deformed relative to other areas of the sheet structure when the outer branch stent 300 is inserted into the hooking gap G, and the easy-to-break strip can better guide the thin-walled area to form 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, polyhydroxyalkanoic acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone, and any other suitable material may also be used.

[0158] Embodiment 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] Reference Fig.21 The protection structure 70 of this embodiment includes a third protection unit 726, which includes a polymer coating 7261, which 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 can move relatively in the axial direction, and a plug hole is provided in at least a part of the area of ​​the support cover 4, for example, a plug hole is formed between two adjacent hooking units 47 for inserting the guide wire and the outer branch stent 300. This arrangement is conducive to reducing the probability that the outer branch stent 300 is guided into the hooking gap G by the guide wire, thereby reducing the probability that the outer branch stent 300 is damaged due to friction.

[0161] The third protection unit 726 includes a double-layer polymer film, which is a first film and a second film. The first film covers the hook gap G on the outside of the hook unit 47 (i.e., the side farther from the bottom of the groove 51), and the second film covers the hook gap G on the inside of the hook unit 47 (i.e., the side closer to the bottom of the groove 51). The first film and the second film overlap to sandwich the hook unit 47. A receiving gap is also formed between the first film and the second film. The trough 4711 of the first hook unit 471 and / or the crest 4721 of the second hook unit 472 are located in the receiving gap, so that the trough 4711 of the first hook unit 471 and / or the crest 4721 of the second hook unit 472 can move relatively in the axial direction, so that the support cover 4 still has good bending performance and can well conform to the deformation of the morphology 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, the first coating is provided with a first perforation and a second perforation. The trough 4711 of the first hook unit 471 and a portion of the wave rod segment 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 a portion of the wave rod segment 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, the trough 4711 of the first hooking unit 471 and a 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 crest 4721 of the second hooking unit 472 and a partial wave rod section connected to the crest 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 hook unit 471 and the partial wave rod section connected to the trough 4711 may be located outside the first coating, and the crest 4721 of the second hook unit 472 and the partial wave rod section connected to the crest 4721 may be located inside the second coating; or, the trough 4711 of the first hook unit 471 and the partial wave rod section connected to the trough 4711 may be located inside the second coating, and the crest 4721 of the second hook unit 472 and the partial wave rod section connected to the crest 4721 may be located outside the first coating. As long as the polymer coating 7261 can completely cover the hooking gap G, and the trough 4711 of the first hook unit 471 and / or the crest 4721 of the second hook unit 472 can move relative to each other in the axial direction, it will be sufficient.

[0163] Reference Fig. 22The polymer coating 7261 can further cover other braided wires 40 on the support cover 4 to further provide better protection for the support cover 4 and the external branch stent 300, but a plug hole 7262 needs to be reserved in at least a part of the support cover 4 so that the guide wire and the external branch stent 300 can be inserted into the radial interval between the support cover 4 and the groove bottom 51 through the plug hole 7262. The shape of the plug hole 7262 is not limited, for example, it can be 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 above-mentioned insertion hole 7262. The shape and position of the crack strips 725 may refer to the description of the third embodiment and will not be described in detail here. When subjected to external force, the crack strips 725 are easy to split to increase the circumference of the insertion hole 7262, which can not only adapt to 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 is deformed relative to other areas of the polymer coating 7261 and extends toward the direction close to the bottom 51 of the groove. This is conducive to increasing the contact area between the protection 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, causing the thrombus to quickly fill the groove 5, thereby blocking 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, polyhydroxyalkanoic acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone, and any other suitable material may also be used.

[0166] Embodiment 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 the 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 interval in the radial 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 plurality of meshes, which connect the groove 5 with the outside. The groove bracket 100 of the present 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 the present embodiment. It can be understood that the present 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] Reference Fig.23 , Fig.24 In this embodiment, the braiding start end B0 and the braiding tail end E0 are fixed to each other by a fixing member 8. The fixing member 8 can not only firmly connect the braiding start end B0 and the braiding tail end E0, but also avoid the risk of damage to the mechanical properties of the area near the braiding start end B0 and the braiding tail end E0 caused by welding.

[0169] Exemplarily, the fixing member 8 includes a fixing sleeve 81, which includes a sleeve lumen, in which the braiding start end B0 and the braiding tail end E0 are fixed. The braiding start end B0 and the braiding tail end E0 can be fixed to each other with the fixing sleeve 81 by applying pressure outside the fixing sleeve 81. The braiding start end B0 and the braiding tail end E0 are arranged relative to each other in the length direction of the braided wire 40, for example, the braiding start end B0 and the braiding tail end E0 are butt-jointed as shown in the figure. In other embodiments, the braiding start end B0 and the braiding tail end E0 can be arranged at intervals. The advantage of the braiding start 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 start end B0 and the braiding tail end E0 can be reduced, and then 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 hinder 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 friction and hooking of the braided wire 40 in other areas of the fixing member 8. It can be understood that in other embodiments, the braiding start 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 can be understood 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 winding or suturing the braiding start end B0 and the braiding tail end E0 with a fixed wire, or winding and fixing the braiding start end B0 and the braiding tail end E0 to a fixed ring.

[0170] The fixing member 8 can be made of a material with a certain developing function, and the fixing member 8 can assist in positioning under an imaging device such as a digital subtraction angiography machine (DSA). For example, the fixing member 8 can be made of metal materials such as stainless steel, nickel titanium, platinum, or the fixing member 8 can also be made of a polymer material doped with developing materials 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, its width is greater than the wire diameter of the braiding wire 40, so 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 setting 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 setting 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 in the direction of the support cover 4 in accordance with the blood vessel and lateral bending after the groove stent 100 is implanted.

[0172] Exemplarily, 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 be greater than or equal to 5% of the axial length of the groove opening 52, a position error can be reserved for the displacement of the groove stent 100 caused by the pulsation of the blood vessel. 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] Reference Fig.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 arranged at the radial edge and / or the 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, thereby reducing the risk of the fixing member 8 and other braided wires 40 being damaged by mutual friction, and at the same time reducing the risk of the fixing member 8 hooking other braided wires 40 and causing the mesh to deform and fail to fully unfold. In particular, when the fixing member 8 is arranged at the radial edge of the support cover 4, even if the groove bracket 100 is subjected to a large radial compression force (for example, the groove bracket 100 is loaded in a conveyor), the fixing member 8 is not easy to be broken, and a stable connection can always be maintained.

[0174] Reference Fig.23 , Figure 27 to Figure 29 , the groove 5 includes an axial edge and a radial edge, wherein the axial edge of the groove 5 is spaced and arranged oppositely along the axial direction of the groove bracket 100, and the radial edge of the groove 5 is spaced 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 the corner 53 of the groove 5 or is located 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 arrangement of the fixing member 8 along the radial edge of the groove 5 does not mean that the fixing member 8 must be as Fig. 27 As shown in the figure, the fixing member 8 is completely in contact with the radial edge of the groove 5, and a gap may be allowed between a part of the fixing member 8 and the radial edge of the groove 5. In other embodiments, the fixing member 8 may be arranged along the axial edge of the groove 5. Compared with the fixing member 8 arranged along the axial edge of the groove 5, the fixing member 8 of this embodiment is arranged along the radial edge of the groove 5. When the groove bracket 100 is subjected to a large radial extrusion force, the fixing member 8 is not easily broken and can always maintain a stable connection. In addition, the probability of the end of the fixing member 8 damaging (for example, puncturing) the radial side wall of the groove 5 when subjected to radial extrusion can be reduced. In other embodiments, the fixing member 8 may be arranged at a position where the radial edge of the groove 5 is away from the corner 53. Compared with the case where the fixing member 8 is arranged at a position away from the corner 53, the fixing member 8 of this embodiment is arranged 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 to 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, so as to avoid blocking the blood flow of the branch blood vessel 200 due to inaccurate release position of the groove bracket 100.

[0175] Reference Fig.23 The support cover 4 is connected to the groove 5 through the edge wave corner 421, the fixing member 8 is arranged on the edge wave corner 421, and the edge wave corner 421 is connected to the hook unit 47. Fig.23The fixing member 8 is arranged on a third wave bar 4212 (referred to as edge wave bar 4212a) directly connected to the radial edge of the groove 5 by the edge wave angle 421. The edge wave bar 4212a extends substantially along the radial edge of the groove 5 and is connected to the hook unit 47. For example, the edge wave bar 4212a is connected to the second hook member 472 of the hook unit 47. Since the first hook member 471 and the second hook member 472 of the hook unit 47 can move relative to each other in the axial direction, the axial force or axial movement of other areas of the support cover 4 is not easily transmitted to the edge wave angle 421, which can reduce the risk of the vertex 4211 of the edge wave angle 421 piercing and injuring the blood vessel.

[0176] In addition, 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, and can further reduce the risk of the vertex 4211 of the edge wave angle 421 piercing and injuring the 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 arranged near the proximal end of the support cover 4 (that is, near the proximal end of the groove opening 52), and a single-branch port bracket 62 is arranged near the proximal end of the support cover 4 (that is, near the distal end of the groove opening 52), therefore, the fixing member 8 is arranged at the distal end of the support cover 4 (that is, the distal end of the groove opening 52), which is conducive to avoiding 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 located 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 located 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] Reference Figure 27 to Figure 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, and the fixing connection method includes suturing, bonding, etc. The advantage of this arrangement is that even if the fixing member 8 or the braided wire 40 in the adjacent area of ​​the fixing member 8 is broken, the side wall of the radial edge of the groove 5 (the side wall is provided with a coating) can prevent the broken fixing member 8 or the braided wire 40 near the broken fixing member 8 from piercing out and damaging the tissue wall.

[0179] In this embodiment, the fixing member 8 is sutured and connected to the inner wall 501 of the radial edge of the groove 5 by sutures, and the sutures form a plurality of 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 a plurality of suture loops, and the plurality of suture loops are arranged in the length direction of the fixing member 8. Each suture loop fixes the fixing member 8 and the inner wall 501 of the radial edge of the groove 5 to each other, forming a suture fixing point 9. By forming a plurality of suture fixing points 9 on the outer surface of the fixing member 8, it is possible to ensure that the fixing member 8 is firmly connected to the radial edge of the groove 5. It is understandable that in other embodiments, the number of suture fixing points 9 may be one or more, and the routing method of the sutures may also be different from the method exemplified in this embodiment.

[0180] Further, refer to Fig.24 and Fig.29 In this embodiment, the braided wire segment adjacent to the braiding start 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 in 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 in 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 out and damaging the inner wall of the tissue.

[0181] Reference Fig.25 , Fig.26In another embodiment, the fixing member 8 may be disposed in the second mesh area 42. The specific structure of the second mesh area 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 bracket 100 is in the loading state or the implanted state, the fixing member 8 and its adjacent braided wire segment on the first direction support wire 481 or the second direction support wire 482 will not be subjected to excessive bending force. Therefore, the fixing member 8 and its adjacent braided wire segment are not easy to break and cause damage to the support cover 4 or pierce the damaged tissue. Exemplarily, the fixing member 8 is located at the intersection unit 48a at the nearest end in the second mesh area 42 (refer to Fig.25 ) or at the farthest cross unit 48b (refer to Fig.26 ), in other embodiments, the fixing member 8 is located near the most proximal cross unit 48a in the second mesh region 42 (the distance from the most proximal cross unit 48a is no more than 5mm) or near the most distal cross unit 48 (the distance from the most distal cross unit 48b is no more than 5mm). The fixing member 8 located 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 that the anchoring area of ​​the outer branch stent 300 and the inner branch stent 5 located near the groove opening 52 is too short due to being too far from the groove opening 52. Further, when the fixing member 8 is located at the cross unit 48 in the second mesh region 42, the fixing member 8 is located on the support wire in the cross unit 48 that is closer to the groove bottom 51. Such a setting can reduce the groove stent 100 after implantation due to the provision of another support wire between the fixing member 8 and the inner wall of the tissue, so that the fixing member 8 has a certain activity space, which can reduce the stimulation of the fixing member 8 to 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 easy to break and cause damage to the support cover 4 or pierce damaged tissue, and even if they break, they are not easy to directly pierce the damaged tissue.

[0183] Reference Figure 2 , Fig.23 and Fig.30 This embodiment also provides a method for preparing the groove bracket 100, comprising:

[0184] S10: providing 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, wherein the mesh structure 4a includes 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 via a fixing member 8 .

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

[0191] The above-mentioned multiple paths include multiple first direction paths and multiple second direction paths. The figure is used as an example to illustrate step S12.

[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] Step A and step B are repeatedly performed alternately until a network structure 4a is formed.

[0196] Reference Fig.30 The first direction path refers to the path extending from right to left as shown in the figure, such as P1, P3, P5, P7, and P9 are all first direction paths. The second direction path refers to Fig.30 The paths extending from left to right, such as P2, P4, P6, P8, and P10, are all second direction paths. Each first direction path and second direction path can include multiple sub-paths. Fig.30Among them, P11~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] Exemplarily, weaving starts from the weaving starting end B0, and weaves along the sub-paths P11, P12, P13, and P14 of the path P1 in sequence to form a first direction weaving unit A1, and weaves along the sub-paths P21, P22, and P23 of the path P2 in sequence to form a second direction weaving unit B1, and weaves along the sub-paths P31, P32, and P33 of the path P3 in sequence to form a first direction weaving unit A2, and weaves along the sub-paths P41, P42, and P43 of the path P4 in sequence to form a second direction weaving unit B2, and weaves along the sub-paths P51, P52, and P53 of the path P5 in sequence to form a first direction weaving unit A3, and weaves along the sub-paths P61, P62, and P63 of the path P6 in sequence to form a second direction weaving unit B1. P63 and P64 are woven to form a second direction weaving unit B3, and the sub-paths P71, P72, and P73 of path P7 are woven in sequence to form a first direction weaving unit A4, and the sub-paths P81, P82, and P83 of path P8 are woven in sequence to form a second direction weaving unit B4, and the sub-paths P91, P92, and P93 of path P9 are woven in sequence to form a first direction weaving unit A5, and the sub-paths P101, P102, P103, and P104 of path P10 are woven in sequence to form a second direction weaving unit B5, 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 first direction braiding units and the second direction braiding units adjacent to each other.

[0199] It can be 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 braiding start end and the braiding end end can be completely different from the present embodiment. For example, E0 can be used as the braiding start end and B0 can be used as the braiding end end according to the same method as the present embodiment. Fig.30Weaving in the direction opposite to the direction of the middle arrow can also form a mesh structure 4a; for example, the weaving starting end and the weaving terminal can be selected near the intersection of the sub-path P22 and the sub-path P102, or any other suitable weaving starting end and the weaving terminal can be selected, as long as the weaving can be achieved to form the mesh structure 4a.

[0200] A side connector 46 may also be provided between the adjacent first direction weaving units and the second direction weaving units. For example, a second side connector 46b is provided between the first direction weaving unit A1 and the second direction weaving unit B1 at the axial end, a second side connector 46b is provided between the first direction weaving unit A3 and the second direction weaving unit B3 at the other axial end, and a second side connector 46b is provided between the first direction weaving unit A4 and the second direction weaving unit B3. Except for the weaving starting end B0 and the weaving terminal end, first side connectors 46a are provided between other adjacent first direction weaving units and second direction weaving units. In this embodiment, the shape of the first side connector 46a is different from the shape of the second side connector 46b. Refer to Fig.30 The first side connecting member 46a is roughly triangular, and the second side connecting member 46b is roughly elliptical. In other embodiments, the two can adopt any other suitable shapes, and the details can be referred to the description of the first embodiment. In other embodiments, the two shapes can be the same.

[0201] It is understandable that the structure of the groove bracket 100 in the above-mentioned embodiments 1 to 5 may be different from the above-mentioned exemplified structure. Fig.31In some embodiments, the groove stent 100 includes a first branch stent 601 and a second branch stent 602. The first branch stent 601 is disposed in the main stent 10 and is connected to the groove 5. One end of the second branch stent 602 is fixedly connected and connected to the main stent 10, and the other end is a free end with a branch opening. The free end of the second branch stent 602 is disposed outside the main stent 10 for implantation in the branch vessel 200 or connection with other stents. The length extension direction of the second branch stent 602 intersects with the axial direction of the groove stent 100; the second branch stent 602 and the first branch stent 601 are both connected to the inner cavity of the main stent 10. After the second branch stent 602 is connected with the corresponding branch blood vessel 200, the groove 5 of the groove stent 100 is aligned with the opening of the other branch blood vessel 200, which can reduce the situation that the groove 5 is difficult to align with the corresponding branch blood vessel 200 due to the 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 blood vessel 200 without occupying the space of the inner cavity of the main stent 10, thereby reducing the occupation of the inner cavity of the main stent 10 by the branch stent and increasing the blood flow of the inner cavity 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 in the main stent 10, the free end of the second branch stent 602 is arranged outside the main stent 10 in this embodiment, which can also enable the guide wire or the outer branch stent 300 to enter the corresponding branch stent more accurately, reducing the risk of the guide wire mistakenly entering another branch stent. Exemplarily, the length extension direction of the second branch stent 602 is perpendicular to the axial direction.

[0202] See also Fig.31 and Fig.32In some embodiments, the first branch stent 601 is disposed in the main stent 10, and the first branch stent 601 is connected to the groove 5; the second branch stent 602 and the first branch stent 601 are disposed on one side of the axial direction of the groove 5. Exemplarily, the second branch stent 602 and the first branch stent 601 are disposed on the proximal side of the groove 5, that is, the second branch stent 602 and the first branch stent 601 are both disposed on the proximal section 2 of the main stent 10. If the first branch stent 601 and the second branch stent 602 are disposed side by side in the radial direction on the proximal side 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 area, which will form a vortex under the impact of blood flow and thus affect the flow direction of blood in the inner cavity 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] See also Fig.31 In some embodiments, a guide segment 6012 is formed at the distal end of the first branch stent 601, and 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, and the guide segment 6012 can guide the entry of the guide wire or the outer branch stent 300.

[0204] See also Fig.33 For example, the proximal end of the groove stent 100 is the upper end, the distal end of the groove stent 100 is the lower end, and the second branch stent 602 is arranged on the right side of the first branch stent 601 to better accommodate the three branch vessels 200 near the aortic arch 300. The second branch stent 602 is used for implantation. Figure 1 The leftmost branch blood vessel 200 can, to a certain extent, position the groove stent 100 after the second branch stent 602 is implanted in the corresponding branch blood vessel 200, so that the groove 5 is aligned with the other two branch blood vessels 200; after the second branch stent 602 is implanted in the corresponding branch blood vessel 200, the second branch stent 602 will not interfere with the implantation of the corresponding external branch stent 300 in the other two branch blood vessels 200, nor will it interfere with the connection between the external branch stent 300 and the corresponding internal 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 used to connect two branch vessels 200 respectively. 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 vessels 200, which can effectively reduce the situation that the groove 5 is difficult to align with the corresponding branch vessel 200 due to the easy deflection of the groove stent 100 when released; 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 occupation of the inner cavity of the main stent 10 by the branch stent, and further increasing the blood flow of 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 ; or, 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 is disposed at the proximal end of the groove 5 .

[0207] The above-mentioned 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-mentioned different embodiments may be replaced or combined with each other. Those skilled in the art may also make simple replacements according to actual needs. The concept of the present invention shall be subject to the required protection scope.

Claims

1. A groove bracket, It is 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, It is 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, It is 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 claim 1, It is 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, It is 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 claim 1, It is 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, It is characterized in that The fixing piece 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 piece.

8. The groove bracket according to claim 6, It is 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 claim 1, It is 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, It is 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, It is 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 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%.

12. The groove bracket according to any one of claims 1 to 9, It is 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, It is 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. A method for manufacturing a groove bracket according to any one of claims 1 to 13, It is 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 the groove bracket according to claim 14, It is 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 the groove bracket according to claim 14, It is 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.

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