Abdominal aortic stent graft group

Abstract

The present invention provides an abdominal aortic stent graft group, which relates to the field of medical devices, including a stable stent graft and a main stent graft; the stable stent graft includes a transverse straight stent graft segment, a longitudinal straight stent graft segment, a conical graft and an X-shaped stent; a portion of the X-shaped stent is fixedly connected to the conical graft, and another portion of the X-shaped stent is fixedly connected to the transverse straight stent graft segment and extends to the graft surface of the transverse straight stent graft segment away from the conical graft; the main stent graft includes a main cylindrical graft and a main stent, and at least one group of clamping pieces is fixedly connected to the distal surface of the main cylindrical graft; in the combined state, the distal opening of the main cylindrical graft is sleeved with the proximal opening of the longitudinal straight stent graft segment, and the flange of the clamping piece is clamped at the stent bend at the proximal end of the longitudinal straight stent graft segment. The present invention can be applied to abdominal aortic aneurysm endovascular repair surgery for patients with abdominal aortic aneurysms that do not involve the iliac artery and unilateral femoral artery access difficulties.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an abdominal aorta covered stent group. Background Art

[0002] Implanting an abdominal aortic stent graft into the abdominal aortic aneurysm cavity is currently the main means of repairing the abdominal aortic aneurysm cavity. In the existing technology, in order to maintain the stability of the abdominal aortic stent graft in the aneurysm cavity, regardless of whether the patient's lesions involve the iliac arteries, iliac branch stents must be implanted in both iliac arteries (even if the patient's abdominal aortic aneurysm does not involve the iliac arteries, the existing technology also requires implanting iliac branch stents in both iliac arteries to ensure the stability of the main stent in the aneurysm cavity).

[0003] The disadvantages of the existing technology include: (1) The surgical operation is complicated and time-consuming. The femoral artery is a direct continuation of the external iliac artery. During the operation, the contralateral iliac branch stent needs to be implanted after puncturing the contralateral femoral artery, and it needs to be docked with the short leg of the main stent, which poses a risk of type III endoleak and leads to high cost of consumables; (2) Since the iliac artery itself is small in size, the implantation of the iliac branch stent increases the risk of iliac artery occlusion; (3) For patients with difficult unilateral femoral artery access, it is not suitable to implant the iliac branch stent through femoral artery puncture. Forced implantation can cause vascular intima rupture and thrombosis. Summary of the invention

[0004] The object of the present invention is to provide an abdominal aorta covered stent group to alleviate the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] An embodiment of the present invention provides an abdominal aorta stent graft group, comprising a stabilizing stent graft and a main body stent graft.

[0007] The stable coated stent comprises a transverse straight coated stent section, a longitudinal straight coated stent section, a conical coating and an X-shaped stent; the diameter of the transverse straight coated stent section is smaller than the diameter of the longitudinal straight coated stent section, a docking window is provided on the side of the transverse straight coated stent section, the smaller diameter opening of the conical coating is sealed and docked with the docking window, and the distal opening of the longitudinal straight coated stent section is sealed and docked with the larger diameter opening of the conical coating; the X-shaped stent comprises two annular stents that intersect with each other and are fixed together at the intersection, a part of the X-shaped stent is fixedly connected to the conical coating, and the other part of the X-shaped stent is fixedly connected to the transverse straight coated stent section and extends to the coating surface on one side of the transverse straight coated stent that is away from the conical coating.

[0008] The main body coating bracket includes a main body cylindrical coating and a main body bracket fixedly connected to the main body cylindrical coating, and at least one group of clamping parts arranged radially symmetrically along the main body cylindrical coating are fixedly connected to the distal surface of the main body cylindrical coating; the clamping parts are fitted to the main body cylindrical coating and have a flange that is turned up in the direction away from the main body cylindrical coating.

[0009] In the assembled state, the distal opening of the main cylindrical coating is sleeved with the proximal opening of the longitudinal straight-tube coated stent segment, and the flange of the clamping piece is clamped at the stent bend at the proximal end of the longitudinal straight-tube coated stent segment.

[0010] Among them, optionally, the longitudinal straight tube coated stent section includes a longitudinal straight tube coating, a proximal fish-mouth stent and a distal fish-mouth stent; the proximal fish-mouth stent and the distal fish-mouth stent are symmetrically distributed along the axial direction of the longitudinal straight tube coating and fixedly connected to the surface of the longitudinal straight tube coating. The proximal fish-mouth stent and the distal fish-mouth stent respectively include two arc-shaped stent units that are symmetrically arranged along the radial direction of the longitudinal straight tube coating and correspondingly connected at the ends, wherein the plane where one of the arc-shaped stent units is located forms an acute angle with the plane where the other arc-shaped stent unit is located to form a "fish-mouth" shape. The fish-mouth opening of the proximal fish-mouth stent faces the proximal end, and the fish-mouth opening of the distal fish-mouth stent faces the distal end; in the assembled state, the clamp is clamped on the distal side of the arc-shaped curved section of the proximal fish-mouth stent.

[0011] Optionally, the proximal fish-mouth bracket and the distal fish-mouth bracket respectively include an inner circle fish-mouth bracket arranged on the inner surface of the longitudinal straight tube coating and an outer circle fish-mouth bracket arranged on the outer surface of the longitudinal straight tube coating.

[0012] Optionally, the transverse straight-tube coated stent segment includes a transverse straight-tube coating and a plurality of wavy stent rings fixedly connected to the transverse straight-tube coating, and the plurality of wavy stent rings are arranged at intervals on both sides of the docking window along the axial direction of the transverse straight-tube coating.

[0013] Optionally, the main cylindrical coating includes a proximal coating segment, a middle elastic coating segment and a distal coating segment which are sequentially connected in the axial direction, and the clamping piece is fixedly connected to the distal coating segment; the main stent includes a proximal bare stent, a proximal wire-wound stent, a mesh stent and a distal wire-wound stent which are sequentially arranged in the axial direction; the distal end of the proximal bare stent is fixedly connected to the proximal end of the proximal coating segment, the proximal wire-wound stent is fixedly connected to the proximal coating segment, the mesh stent is fixedly connected to the middle elastic coating segment, and the distal wire-wound stent is fixedly connected to the distal coating segment.

[0014] Optionally, the distal wire-wound stent is arranged on the inner surface of the distal coating segment, and the clamping piece is arranged on the outer surface of the distal coating segment. In the assembled state, the clamping piece is clamped at the bend of the proximal stent arranged on the inner surface of the longitudinal straight coating.

[0015] Optionally, the proximal wire-wound stent is disposed on an outer surface of the proximal coating segment.

[0016] Optionally, the proximal wire-wound stent comprises at least one wavy stent ring.

[0017] Optionally, the clamping member is a diamond-shaped clamping ring, and the proximal end and the distal end of the clamping ring respectively form the flanges.

[0018] Optionally, the distal wire-wound stent is a wavy stent ring.

[0019] The abdominal aortic covered stent group provided in the embodiment of the present invention can be used in abdominal aortic aneurysm endovascular repair surgery for patients with abdominal aortic aneurysm not involving the iliac artery and those with difficult unilateral femoral artery access. The specific surgical operation steps and the functional effects that can be achieved by each part of the structure can be found in the specific implementation method section of this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the overall structure of an abdominal aorta covered stent assembly provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the overall structure of a stable stent graft in the abdominal aorta stent graft set provided by an embodiment of the present invention;

[0023] Figure 3 for Figure 2 An enlarged view of the local structure of the longitudinal straight-tube stent graft segment in the stable stent graft shown;

[0024] Figure 4 for Figure 2 A schematic diagram of the overall structure of an X-shaped stent in the stable stent graft shown;

[0025] Figure 5 A schematic diagram of the overall structure of the main stent graft in the abdominal aorta stent graft set provided in an embodiment of the present invention;

[0026] Figure 6for Figure 5 A partial enlarged view of the structure shown;

[0027] Figure 7 Steps for implanting the abdominal aorta stent graft assembly provided by the embodiment of the present invention into a patient's body Figure 1 ;

[0028] Figure 8 Steps for implanting the abdominal aorta stent graft assembly provided by the embodiment of the present invention into a patient's body Figure 2 ;

[0029] Fig. 9 Steps for implanting the abdominal aorta stent graft assembly provided by the embodiment of the present invention into a patient's body Figure 3 ;

[0030] Fig.10 Steps for implanting the abdominal aorta stent graft assembly provided by the embodiment of the present invention into a patient's body Figure 4 .

[0031] Icons: 100-stable stent graft; 200-main stent graft; 300-catheter; 400-guidewire; 500-delivery sheath; 11-transverse straight stent graft segment; 12-longitudinal straight stent graft segment; 1211-proximal fish-mouth stent; 1212-distal fish-mouth stent; 13-conical graft; 14-X-shaped stent; 21-main cylindrical graft; 211-proximal graft segment; 212-middle elastic graft segment; 213-distal graft segment; 22-main stent; 221-proximal bare stent; 222-proximal wire-wound stent; 223-mesh stent; 224-distal wire-wound stent; 23-clamping fixture; 231-flange. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that:

[0036] Unless otherwise clearly specified and limited, the terms "disposed", "installed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The terms “first”, “second”, etc. are only used for distinguishing descriptions and do not indicate the total number or relative position in time and / or space, and cannot be understood as indicating or implying relative importance.

[0038] The orientation or position relationship indicated by the terms "proximal", "distal", "lateral", "longitudinal", "axial", "radial", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] Specifically, some embodiments of the present invention are described in detail with reference to the accompanying drawings.

[0040] This embodiment provides an abdominal aorta covered stent assembly, referring to Figures 1 to 6 The abdominal aorta covered stent group includes a stable covered stent 100 and a main covered stent 200. The direction of blood flow from the abdominal aorta to the iliac branch artery is from the proximal end to the distal end. After the stable covered stent 100 and the main covered stent 200 are respectively implanted into the patient's body, the inflow end of the blood flow of each stent is the proximal end of the stent, and the outflow end of the blood flow is the distal end of the stent. Moreover, after the abdominal aorta covered stent group is implanted into the patient's body, the axial direction of the stent segment (main covered stent 200) in the abdominal aorta is the longitudinal direction, and the direction perpendicular to the longitudinal direction is the transverse direction. Specifically: Figure 1-Figure 6As shown, the stable coated stent 100 includes a transverse straight coated stent segment 11, a longitudinal straight coated stent segment 12, a conical coating 13 and an X-shaped stent 14; the diameter of the transverse straight coated stent segment 11 is smaller than the diameter of the longitudinal straight coated stent segment 12, a docking window is provided on the side of the transverse straight coated stent segment 11, the smaller diameter opening of the conical coating 13 is sealed and docked with the docking window on the side of the above-mentioned transverse straight coated stent segment 11, and the distal opening of the longitudinal straight coated stent segment 12 is sealed and docked with the larger diameter opening of the conical coating 13; the X-shaped stent 14 includes two annular stents that cross each other and are fixed together at the intersection, a part of the X-shaped stent 14 is fixedly connected to the conical coating 13, and the other part of the X-shaped stent 14 is fixedly connected to the transverse straight coated stent segment 11 and extends to the coating surface on one side of the transverse straight coated stent segment 11 away from the conical coating 13.

[0041] The main body coating bracket 200 includes a main body cylindrical coating 21 and a main body bracket 22 fixedly connected to the main body cylindrical coating 21, and at least one group of clamping parts 23 arranged radially symmetrically along the main body cylindrical coating 21 are fixedly connected to the distal surface of the main body cylindrical coating 21; the clamping parts 23 are fitted to the main body cylindrical coating 21 and have a flange 231 that is turned up in the direction away from the main body cylindrical coating 21.

[0042] In the assembled state, the distal opening of the main cylindrical coating 21 of the main coated stent 200 is socketed with the proximal opening of the longitudinal straight coated stent segment 12 of the stabilizing coated stent 100, and the flange 231 of the clamping piece 23 is clamped at the proximal bend of the longitudinal straight coated stent segment 12.

[0043] The abdominal aortic stent graft set provided in this embodiment can be used for abdominal aortic aneurysm endovascular repair surgery in patients with abdominal aortic aneurysm without iliac artery involvement and unilateral femoral artery access difficulties. The specific surgical operation steps are as follows: Figures 7 to 10 :The first step, refer to Figure 7 , femoral artery puncture, guide wire 400 is sent to the bifurcation of iliac artery along femoral artery through catheter 300, and guide wire 400 is selected into contralateral iliac artery by "climbing the mountain" operation with catheter 300; second step, refer to Figure 8 , withdraw the catheter 300, and deliver the delivery sheath 500 to the target location along the guide wire 400; the third step, refer to Fig. 9 , release and stabilize the stent graft 100; Step 4, refer to Fig.10 , pass the guide wire 400 through the proximal opening of the longitudinal straight-tube coated stent segment 12 that stabilizes the coated stent 100, use the conveyor sheath 500 to implant the main coated stent 200 along the guide wire 400, and finally make the distal opening of the main cylindrical coating 21 and the proximal opening of the longitudinal straight-tube coated stent segment 12 fit together, and the flange 231 of the clamping piece 23 is clamped at the stent bend at the proximal end of the longitudinal straight-tube coated stent segment 12.

[0044] For patients whose abdominal aortic aneurysm does not involve the iliac artery and whose unilateral femoral artery access is difficult, the prior art requires the implantation of iliac branch stents in the bilateral iliac arteries during the endovascular repair of abdominal aortic aneurysm. However, the abdominal aortic stent graft set provided in this embodiment does not require the implantation of iliac branch stents in the bilateral iliac arteries respectively, and the operation can be completed only through the unilateral femoral artery puncture access, which has at least the following beneficial effects:

[0045] (1) Simple operation and short operation time;

[0046] (2) The main stent graft 200 is supported and positioned by bending the transverse straight stent graft segment 11 of the stabilizing stent graft 100, and there is no need to implant a larger iliac branch stent into the bilateral iliac arteries, thereby avoiding the risk of iliac artery occlusion, vascular intima rupture and thrombosis caused by implanting a large iliac branch stent;

[0047] (3) After implantation, the two stent graft modules of the stabilizing stent graft 100 and the main stent graft 200 are butted against each other at the proximal part of the iliac artery branch, without a large angle at the butt joint and the two are fixed by a fastening piece 23 to prevent displacement and bleeding, thereby reducing the risk of type III endoleak and reducing bleeding in patients;

[0048] (4) In the stable coated stent 100, a portion of the X-shaped stent 14 is fixedly connected to the conical coating 13, and another portion of the X-shaped stent 14 is fixedly connected to the transverse straight coated stent segment 11 and extends to the coated surface on the side of the transverse straight coated stent segment 11 away from the conical coating 13. The conical coating 13 can be effectively supported radially by the X-shaped stent 14, and the stable coated stent 100 can achieve a smaller compression volume (when compressed, the stable coated stent 100 is compressed along the radial direction of the transverse straight coated stent segment 11 in the stable coated stent 100, that is, the axial direction of the longitudinal straight coated stent segment 12), thereby reducing the size of the conveyor sheath 500, facilitating the conveyor sheath 500 to pass through tortuous blood vessels, and improving the smoothness of surgical operations.

[0049] In the abdominal aorta stent graft group provided in the present embodiment, optionally, the longitudinal straight stent graft segment 12 of the stable stent graft 100 includes a longitudinal straight stent graft, a proximal fish mouth stent 1211 and a distal fish mouth stent 1212; wherein the proximal fish mouth stent 1211 and the distal fish mouth stent 1212 are symmetrically distributed along the axial direction of the longitudinal straight stent graft and fixedly connected to the surface of the longitudinal straight stent graft. The proximal fish mouth stent 1211 and the distal fish mouth stent 1212 respectively include two arc stent units arranged symmetrically along the radial direction of the longitudinal straight stent graft and correspondingly connected at the ends, wherein the plane where one arc stent unit is located forms an acute angle with the plane where the other arc stent unit is located to form a "fish mouth" shape; the fish mouth opening of the proximal fish mouth stent 1211 faces the proximal end, and the fish mouth opening of the distal fish mouth stent 1212 faces the distal end; in the assembled state, the clamping member 23 is clamped on the distal side of the arc-shaped curved section of the proximal fish mouth stent 1211. In this optional structure, by providing the proximal fish-mouth stent 1211 and the distal fish-mouth stent 1212 of such a structural form, it is possible to provide a larger radial support force to the longitudinal straight-tube coating while preventing the longitudinal straight-tube coating from shortening, and facilitate the overall compression of the stable coated stent 100 in the conveyor sheath 500 for conveying. During compression, the stable coated stent 100 is compressed along the radial direction of the transverse straight-tube coated stent segment 11 in the stable coated stent 100, that is, the axial direction of the longitudinal straight-tube coated stent segment 12. Since the stent portion of the longitudinal straight-tube coated stent segment 12 is the proximal fish-mouth stent 1211 and the distal fish-mouth stent 1212 arranged longitudinally opposite to each other, the longitudinal straight-tube coated stent segment 12 can be compressed as close as possible to the outer surface of the coating of the transverse straight-tube coated stent segment 11, thereby making the stable coated stent 100 reach the minimum compression volume, further reducing the size of the conveyor sheath 500, making it more convenient for the conveyor sheath 500 to pass through tortuous blood vessels, and improving the smoothness of surgical operations.

[0050] In this embodiment, in order to further enhance the supporting force of the longitudinal straight-tube coated support segment 12 after release and to further improve the sealing performance, it is preferred, but not limited to, that the proximal fish-mouth support 1211 and the distal fish-mouth support 1212 respectively include an inner circle fish-mouth support provided on the inner surface of the longitudinal straight-tube coating and an outer circle fish-mouth support provided on the outer surface of the longitudinal straight-tube coating, and the longitudinal straight-tube coating is clamped between the inner and outer circle fish-mouth supports.

[0051] In an optional implementation of the present embodiment, for stabilizing the coated stent 100, its transverse straight-cylinder coated stent segment 11 includes a transverse straight-cylinder coating and a plurality of wavy stent rings fixedly connected to the transverse straight-cylinder coating, and these wavy stent rings are arranged at intervals along the axial direction of the transverse straight-cylinder coating on both sides of the docking window, so that the transverse straight-cylinder coated stent segment 11 has better flexibility, so that it can bend more easily to complete the "climbing the mountain".

[0052] In an optional implementation of this embodiment, for the main stent graft 200, in order to make it better adapt to and be positioned in the abdominal aortic aneurysm cavity, refer to Figure 5 and Figure 6 , combined with Fig.10 The main cylindrical coating 21 includes a proximal coating segment 211, a middle elastic coating segment 212 and a distal coating segment 213 which are sequentially connected in the axial direction, and a clamping piece 23 is fixedly connected to the distal coating segment 213; the main stent 22 includes a proximal bare stent 221, a proximal wire-wound stent 222, a mesh stent 223 and a distal wire-wound stent 224 which are sequentially arranged in the axial direction; the distal end of the proximal bare stent 221 is fixedly connected to the proximal end of the proximal coating segment 211 to play an anchoring role, and at the same time, the bare stent 221 is fixedly connected to the proximal end of the proximal coating segment 211 to play an anchoring role. The stent will not block the blood supply of the renal artery branches on both sides of the abdominal aorta; the proximal wire-wound stent 222 is fixedly connected to the proximal coated section 211, and the wire-wound stent provides support force while taking into account flexibility; the grid stent 223 is fixedly connected to the middle elastic coated section 212, so that the section can be elastically compressed to adjust the overall length of the main coated stent 200; the distal wire-wound stent 224 is fixedly connected to the distal coated section 213, and similarly, the wire-wound stent provides support force while taking into account flexibility. In this optional embodiment, by providing the middle elastic coated section 212 and the grid stent 223, the overall length of the main coated stent 200 after being released into the abdominal aortic aneurysm cavity can be adjusted by utilizing the retractable characteristics of the grid stent to meet the needs of different patients.

[0053] For the main stent graft 200, further optionally and preferably, its distal wire-wound stent 224 is arranged on the inner surface of the distal coating segment 213, and the clamping piece 23 is arranged on the outer surface of the distal coating segment 213. In the assembled state, the clamping piece 23 is clamped at the proximal stent bend arranged on the inner surface of the longitudinal straight-tube coating of the stable coating stent 100, forming a docking structure in which the distal end of the main stent graft 200 is inserted and fixed to the proximal inner part of the longitudinal straight-tube coating stent segment 12 in the stable coating stent 100. In addition, optionally, its proximal wire-wound stent 222 is arranged on the outer surface of the proximal coating segment 211 to ensure that the proximal coating segment 211 fits the inner wall at the entrance of the abdominal aortic aneurysm cavity to reduce type I internal leakage; in addition, for the specific structural form of the proximal wire-wound stent 222, it is optional but not limited to include at least one wavy stent ring, and optionally but not limited to, the distal wire-wound stent 224 is a wavy stent ring.

[0054] As for the specific structural form of the clamping member 23, it is preferred but not limited to adopting the following Figure 5 and Figure 6 The diamond-shaped clamping ring shown has flanges 231 formed at its proximal and distal ends respectively.

[0055] Finally, it should be noted that the above embodiments and their optional implementation modes in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned optional implementation modes, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, it is emphasized again that the features of the embodiments in this specification and the optional implementation modes in the embodiments can be combined with each other without conflict.

Claims

1. An abdominal aorta stent graft assembly, characterized in that: It comprises a stabilizing stent graft (100) and a main stent graft (200); The stable coated stent (100) comprises a transverse straight coated stent section (11), a longitudinal straight coated stent section (12), a conical coating (13) and an X-shaped stent (14); the diameter of the transverse straight coated stent section (11) is smaller than the diameter of the longitudinal straight coated stent section (12); a docking window is provided on the side of the transverse straight coated stent section (11); the smaller diameter opening of the conical coating (13) is sealed and docked with the docking window; the longitudinal straight coated stent section (12) is 2) is sealed and docked with the larger diameter opening of the conical coating (13); the X-shaped bracket (14) comprises two annular brackets that intersect each other and are fixed together at the intersection, a part of the X-shaped bracket (14) is fixedly connected to the conical coating (13), and another part of the X-shaped bracket (14) is fixedly connected to the transverse straight-tube coated bracket section (11) and extends to the coating surface on one side of the transverse straight-tube coated bracket section (11) away from the conical coating (13); The main body coated stent (200) comprises a main body cylindrical coating (21) and a main body stent (22) fixedly connected to the main body cylindrical coating (21); at least one group of clamping members (23) arranged radially symmetrically along the main body cylindrical coating (21) are fixedly connected to the distal end surface of the main body cylindrical coating (21); the clamping members (23) are fitted to the main body cylindrical coating (21) and have a flange (231) that is turned up in a direction away from the main body cylindrical coating (21); In the assembled state, the distal opening of the main cylindrical coating (21) is sleeved with the proximal opening of the longitudinal straight-tube coated stent segment (12), and the flange (231) of the clamping piece (23) is clamped at the proximal stent bend of the longitudinal straight-tube coated stent segment (12).

2. The abdominal aorta stent graft assembly according to claim 1, characterized in that: The longitudinal straight-tube coated stent segment (12) comprises a longitudinal straight-tube coated stent, a proximal fish-mouth stent (1211) and a distal fish-mouth stent (1212); The proximal fish-mouth support (1211) and the distal fish-mouth support (1212) are symmetrically distributed along the axial direction of the longitudinal straight-tube coating and are fixedly connected to the surface of the longitudinal straight-tube coating; The proximal fish-mouth support (1211) and the distal fish-mouth support (1212) respectively comprise two arc-shaped support units which are symmetrically arranged along the radial direction of the longitudinal straight tube coating and whose ends are correspondingly connected, wherein a plane where one of the arc-shaped support units is located forms an acute angle with a plane where the other arc-shaped support unit is located to form a "fish-mouth" shape; The fish mouth opening of the proximal fish mouth bracket (1211) faces the proximal end, and the fish mouth opening of the distal fish mouth bracket (1212) faces the distal end; in the assembled state, the clamping piece (23) is clamped on the distal side of the arc-shaped curved section of the proximal fish mouth bracket (1211).

3. The abdominal aorta stent graft assembly according to claim 2, characterized in that: The proximal fish-mouth support (1211) and the distal fish-mouth support (1212) respectively comprise an inner circle fish-mouth support arranged on the inner surface of the longitudinal straight tube coating and an outer circle fish-mouth support arranged on the outer surface of the longitudinal straight tube coating.

4. The abdominal aorta stent graft assembly according to claim 1, characterized in that: The transverse straight-tube coated stent segment (11) comprises a transverse straight-tube coating and a plurality of wavy stent rings fixedly connected to the transverse straight-tube coating, wherein the plurality of wavy stent rings are arranged at intervals on both sides of the docking window along the axial direction of the transverse straight-tube coating.

5. The abdominal aorta stent graft assembly according to claim 1, characterized in that: The main cylindrical coating (21) comprises a proximal coating segment (211), a middle elastic coating segment (212), and a distal coating segment (213) which are sequentially connected in the axial direction, and the clamping member (23) is fixedly connected to the distal coating segment (213); The main stent (22) comprises a proximal bare stent (221), a proximal wire-wound stent (222), a mesh stent (223), and a distal wire-wound stent (224) which are sequentially arranged in the axial direction; The distal end of the proximal bare stent (221) is fixedly connected to the proximal end of the proximal coated segment (211), the proximal wire-wound stent (222) is fixedly connected to the proximal coated segment (211), the mesh stent (223) is fixedly connected to the middle elastic coated segment (212), and the distal wire-wound stent (224) is fixedly connected to the distal coated segment (213).

6. The abdominal aorta stent graft assembly according to claim 5, characterized in that: The distal wire-wound support (224) is arranged on the inner surface of the distal coating section (213), and the clamping member (23) is arranged on the outer surface of the distal coating section (213). In the assembled state, the clamping member (23) is clamped at the bend of the proximal support arranged on the inner surface of the longitudinal straight coating.

7. The abdominal aorta stent graft assembly according to claim 5, characterized in that: The proximal wire-wound stent (222) is arranged on the outer surface of the proximal coating section (211).

8. The abdominal aorta stent graft assembly according to claim 5, characterized in that: The proximal wire-wound stent (222) comprises at least one wavy stent ring.

9. The abdominal aorta stent graft assembly according to claim 5, characterized in that: The clamping member (23) is a diamond-shaped clamping ring, the proximal end and the distal end of which respectively form the flanges (231).

10. The abdominal aorta covered stent assembly according to claim 9, characterized in that: The distal wire-wound stent (224) is a wavy stent ring.

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