Abdominal aorta multi-branch stent

Abstract

The present application relates to an abdominal main multi-branch stent, which includes a main support frame, a connecting support frame, a main body coating, a branch coating and a connecting coating. The main body coating is provided with a first mounting hole, and the branch coating is connected to the first mounting hole through the connecting coating. The main support frame supports the main body coating, and a plurality of main support frames are arranged along the axial direction of the main body coating. The planar unfolded structure of each main support frame is wavy. The connecting support frame supports the connecting coating, and the connecting support frame includes a plurality of waveform segments extending in a direction away from the branch coating, and the plurality of waveform segments are connected end to end to form a waveform closed-loop structure. A straight line parallel to the axis of the main body coating and intersecting with the central axis of the connecting coating is defined as an axial broken line, and the axial broken line passes through the crest or trough of the main support frame, as well as the crest of the waveform segment or the trough between adjacent waveform segments. The abdominal main multi-branch stent provided by the present application solves the technical problem that it is difficult for the coated stent to simultaneously have good compressibility and sealing properties.

Description

Technical Field

[0001] The present application relates to the technical field of lumen stents, and in particular to an abdominal main multi-branch stent. Background Art

[0002] The human body has various tubular cavities, such as the lumen, trachea, esophagus, bile duct, intestines and urethra, with diameters ranging from a few millimeters to tens of millimeters.

[0003] When these tubular cavities develop lesions, such as stenosis, leakage or tumor-like expansion, a lumen stent is generally implanted to expand and open the stenotic tubular cavity, or a covered stent is implanted to repair the lumen tumor and leakage to restore the patency of the human body's tubular cavity.

[0004] Therefore, the stent graft not only needs to have good compressibility to facilitate passage through a narrow tubular lumen, but also needs to be able to cling to the inner wall of the tubular lumen to prevent leakage. Summary of the Invention

[0005] Based on this, it is necessary to provide an abdominal main multi-branch stent to solve the technical problem in the existing technology that the coated stent is difficult to simultaneously achieve good compressibility and sealing.

[0006] The abdominal main multi-branch stent provided in the present application includes a main support frame, a connecting support frame, a main body coating, a branch coating and a connecting coating. The main body coating and the branch coating are both cylindrical, and the connecting coating is annular around the branch coating. The side wall of the main body coating is provided with one or more first mounting holes, and each branch coating is connected to the side of the first mounting hole through the corresponding connecting coating. The main support frame is used to support the main body coating, and the multiple main support frames are arranged along the axial direction of the main body coating. The planar expansion structure of each main support frame along the circumferential direction of the main body coating is wavy. The connecting support frame is used to support the connecting coating, and the connecting support frame includes a plurality of waveform segments with peaks extending in a direction away from the branch coating. The multiple waveform segments are arranged in sequence along the circumferential direction of the connecting coating and connected end to end to form a waveform closed loop structure. A straight line parallel to the axis of the main coating is defined as the busbar, and a busbar intersecting the central axis of the connecting coating is defined as the axial fold line. The axial fold line passes through the crest or trough of each main support frame, and the axial fold line passes through the crest of the corresponding waveform segment or through the trough between adjacent waveform segments, so that the abdominal main multi-branch stent can be radially folded through the axial fold line.

[0007] In one embodiment, the planar unfolded structure of each main support frame along the circumferential direction of the main body coating presents a simple harmonic waveform.

[0008] In one embodiment, the connecting coating central axis and the main body coating axis are defined as a vertical plane, and a straight line perpendicular to the vertical plane and intersecting with the connecting coating central axis is defined as a radial fold line. The radial fold line passes through the gap between adjacent main support frames, and the radial fold line passes through the crest of the corresponding waveform segment or through the trough between adjacent waveform segments, so that the abdominal main multi-branch stent can be axially folded through the radial fold line.

[0009] In one embodiment, there are four wave segments, defined as a first wave segment, a second wave segment, a third wave segment, and a fourth wave segment. The first wave segment, the second wave segment, the third wave segment, and the fourth wave segment are sequentially connected end to end to form a connected support frame. An axial fold line passes through the trough between the first wave segment and the fourth wave segment, and an axial fold line passes through the trough between the second wave segment and the third wave segment. A radial fold line passes through the trough between the first wave segment and the second wave segment, and a radial fold line passes through the trough between the third wave segment and the fourth wave segment.

[0010] In one embodiment, the abdominal main multi-branch stent further includes a sub-support frame configured to support the branch grafts. The sub-support frame is configured to have a wavy structure when deployed in a planar manner along the circumference of the branch grafts, with axial fold lines passing through crests or troughs of the sub-support frame, and radial fold lines passing through crests or troughs of the sub-support frame.

[0011] In one embodiment, the main body membrane includes a plurality of first annular pore regions extending along its circumference, and the main body membrane also includes a plurality of second annular pore regions extending along its circumference, wherein the first annular pore regions and the second annular pore regions are alternately arranged along the axial direction of the main body membrane. The first annular pore regions are provided with a plurality of densely distributed first pores, and the second annular pore regions are provided with a plurality of densely distributed second pores, wherein the pore size of the first pores is larger than the pore size of the second pores.

[0012] In one embodiment, the main coating includes a first end and a second end, and the branch coating is arranged between the first end and the second end. Along the direction from the first end to the branch coating, a plurality of main support frames are defined as a first metal frame, a second metal frame and a third metal frame in sequence, and the planar expansion structures of the first metal frame, the second metal frame and the third metal frame along the circumferential direction of the main coating all present a simple harmonic waveform, and the angular frequency of the expansion structure of the first metal frame and the angular frequency of the expansion structure of the second metal frame are both smaller than the angular frequency of the expansion structure of the third metal frame. Along the direction from the second end to the branch coating, a plurality of main support frames are defined as a fourth metal frame, a fifth metal frame and a sixth metal frame in sequence, and the planar expansion structures of the fourth metal frame, the fifth metal frame and the sixth metal frame along the circumferential direction of the main coating all present a simple harmonic waveform, and the angular frequency of the expansion structure of the fourth metal frame and the angular frequency of the expansion structure of the fifth metal frame are both smaller than the angular frequency of the expansion structure of the sixth metal frame.

[0013] In one embodiment, the first metal frame and the fourth metal frame are arranged in a mirror-symmetrical manner, or the first metal frame and the fourth metal frame are arranged in a periodic arrangement along the axial direction of the main body coating;

[0014] And / or, the second metal frame and the fifth metal frame are arranged in a mirror-symmetrical manner, or the second metal frame and the fifth metal frame are arranged in a periodic arrangement along the axial direction of the main body coating;

[0015] And / or, the third metal frame and the sixth metal frame are arranged in a mirror-symmetrical manner, or the third metal frame and the sixth metal frame are arranged in a periodic arrangement along the axial direction of the main body coating;

[0016] And / or, the first metal frame and the second metal frame are arranged in a mirror-symmetrical manner, or the first metal frame and the second metal frame are arranged in a periodic arrangement along the axial direction of the main body coating;

[0017] And / or, the fourth metal frame and the fifth metal frame are arranged in mirror symmetry, or the fourth metal frame and the fifth metal frame are arranged in a periodic arrangement along the axial direction of the main body coating.

[0018] In one embodiment, the third metal frame includes a first corrugated bracket and a second corrugated bracket, one of which is sleeved around the outer periphery of the other, or one of which is disposed on the inner wall of the main body covering, while the other is disposed on the outer wall of the main body covering. The sixth metal frame includes a third corrugated bracket and a fourth corrugated bracket, one of which is sleeved around the outer periphery of the other, or one of which is disposed on the inner wall of the main body covering, while the other is disposed on the outer wall of the main body covering.

[0019] In one embodiment, the crests of the first corrugated support and the crests of the second corrugated support are staggered along the circumference of the main body covering;

[0020] And / or, the crests of the third corrugated support and the crests of the fourth corrugated support are staggered along the circumference of the main body covering;

[0021] And / or, the wave crests of the first corrugated bracket and the wave crests of the third corrugated bracket are arranged opposite each other along the circumference of the main body covering, or the wave crests of the first corrugated bracket and the wave crests of the third corrugated bracket are arranged staggered along the circumference of the main body covering;

[0022] And / or, the wave crests of the second corrugated bracket and the wave crests of the fourth corrugated bracket are arranged opposite each other along the circumference of the main body coating, or the wave crests of the second corrugated bracket and the wave crests of the fourth corrugated bracket are arranged staggered along the circumference of the main body coating.

[0023] In one embodiment, the first metal frame includes a fifth corrugated bracket and a sixth corrugated bracket, one of which is sleeved around the outer periphery of the other, or one of which is disposed on the inner wall of the main body covering, while the other is disposed on the outer wall of the main body covering. The fourth metal frame includes a seventh corrugated bracket and an eighth corrugated bracket, one of which is sleeved around the outer periphery of the other, or one of which is disposed on the inner wall of the main body covering, while the other is disposed on the outer wall of the main body covering.

[0024] In one embodiment, at least part of the wave crest of the fifth corrugated support protrudes from the end of the main body covering along the axial direction of the main body covering;

[0025] And / or, at least part of the wave crests of the seventh corrugated stent protrudes from the end of the main body coating along the axial direction of the main body coating.

[0026] In one embodiment, the diameter of the branch covering is smaller than the inner diameter of the first mounting hole, and the axial direction of the main covering is non-parallel to the axial direction of the branch covering. The connecting covering is truncated cone-shaped, with one end of the connecting covering connected to the edge of the first mounting hole and the other end recessed toward the inside of the main covering and connected to the edge of one end of the branch covering. The branch covering is disposed outside the connecting covering, and the end of the branch covering away from the connecting covering extends in a direction away from the axis of the main covering.

[0027] Compared with the existing technology, the abdominal main multi-branch stent provided in the present application, first of all, by setting a main support frame and a connecting support frame, the abdominal main multi-branch stent in the expanded state can maintain its own shape and will not be deformed, thereby ensuring that the main body coating can fit tightly with the inner wall of the tubular cavity, thereby preventing the abdominal main multi-branch stent from leaking internally. That is, such a setting greatly improves the sealing performance of the abdominal main multi-branch stent.

[0028] Furthermore, the planar unfolded structure of the main support frame along the circumferential direction of the main body covering is wavy, and the axial fold line passes through the crest or trough of each main support frame.

[0029] It can be seen from this that when the main support frame is folded in half along the radial direction, the crease (that is, the axial fold line) passes through the crest or trough of each main support frame. Since the main support frame extends along the circumferential direction of the main body coating, the tangent line of the main support frame at the crest or trough is perpendicular to the axial fold line. At this time, the main support frame has the least resistance stress to folding, that is, the main support frame is easiest to be folded.

[0030] Furthermore, the connecting support frame is composed of multiple wave segments arranged in sequence along the circumferential direction of the connecting film and connected end to end to form a wave closed loop structure, and the axial broken line passes through the crest of the corresponding wave segment or through the trough between adjacent wave segments.

[0031] It can be seen from this that when the main support frame is folded in half along the radial direction, the crease (that is, the axial fold line) passes through the crest of the corresponding waveform segment or through the trough between adjacent waveform segments. Since the connecting support frame is in a circular ring shape surrounding the branch coating, the tangent of the connecting support frame at the crest or trough is also perpendicular to the axial fold line. At this time, the resistance stress generated by the connecting support frame to folding is the smallest, that is, the connecting support frame is easiest to be folded.

[0032] Therefore, in summary, the abdominal main multi-branch stent provided in the present application not only has a strong sealing performance, but can also be folded and compressed along its own radial direction to facilitate delivery into the tubular cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 Schematic diagram of the structure of the abdominal main multi-branch stent according to an embodiment of the present invention Figure 1 ;

[0035] Figure 2 Schematic diagram of the structure of the abdominal main multi-branch stent according to an embodiment of the present invention Figure 2 ;

[0036] Figure 3 This is an enlarged view of the partial structure of the abdominal main multi-branch stent according to one embodiment of the present application;

[0037] Figure 4 This is a schematic structural diagram of an abdominal main multi-branch stent according to another embodiment of the present application;

[0038] Figure 5 A schematic structural diagram of an abdominal main multi-branch stent according to another embodiment of the present application;

[0039] Figure 6 This is a schematic structural diagram of an abdominal main multi-branch stent according to another embodiment of the present application.

[0040] Figure markings: 110, first metal frame; 111, fifth corrugated bracket; 112, sixth corrugated bracket; 120, second metal frame; 130, third metal frame; 131, first corrugated bracket; 132, second corrugated bracket; 140, fourth metal frame; 141, seventh corrugated bracket; 142, eighth corrugated bracket; 150, fifth metal frame; 160, sixth metal frame; 161, third corrugated bracket; 162, fourth corrugated bracket; 200, connecting support frame; 210, first band; 220, second band; 230, third band; 240, fourth band; 300, main body coating; 310, first end; 320, second end; 400, branch coating; 500, connecting coating; 600, sub-support frame; 700, reference coating; 800, reference support frame. DETAILED DESCRIPTION

[0041] The human body has various tubular cavities, such as the lumen, trachea, esophagus, bile duct, intestines and urethra, with diameters ranging from a few millimeters to tens of millimeters.

[0042] When these tubular cavities develop lesions, such as stenosis, leakage or tumor-like expansion, a lumen stent is generally implanted to expand and open the stenotic tubular cavity, or a covered stent is implanted to repair the lumen tumor and leakage to restore the patency of the human body's tubular cavity.

[0043] Therefore, the stent graft not only needs to have good compressibility to facilitate passage through a narrow tubular lumen, but also needs to be able to cling to the inner wall of the tubular lumen to prevent leakage.

[0044] In order to solve the technical problem in the prior art that it is difficult for a coated stent to simultaneously have good compressibility and sealing properties, the present application provides an abdominal main multi-branch stent.

[0045] See also Figures 1-6 The abdominal main multi-branch stent includes a main support frame, a connecting support frame 200, a main body coating 300, a branch coating 400, and a connecting coating 500. The main body coating 300 and the branch coating 400 are both cylindrical, and the connecting coating 500 is annular and surrounds the branch coating 400. The side wall of the main body coating 300 is provided with one or more first mounting holes, and each branch coating 400 is connected to the side of the first mounting hole through the corresponding connecting coating 500.

[0046] The main support frame is arranged on the outer surface, inner surface or side wall of the main covering 300 to support the main covering 300. The main support frames are arranged along the axial direction of the main covering 300, and each main support frame has a wavy structure along the circumferential direction of the main covering 300.

[0047] It should be noted that the wavy shape is a shape that extends continuously in an S-shape or approximately in an S-shape along a certain direction, and in the present application, the wavy main support frame extends along the circumferential direction of the main body coating 300 .

[0048] Specifically, in one embodiment, Figures 1-6 As shown, the planar unfolding structure of each main support frame along the circumferential direction of the main covering film 300 is a simple harmonic waveform.

[0049] It should be noted that the circumferential direction of the main body coating 300 corresponds to the x-axis direction of the simple harmonic waveform, and the axial direction of the main body coating 300 corresponds to the y-axis direction of the simple harmonic waveform.

[0050] It should be noted that the wave function of the simple harmonic waveform is in the form of a sine or cosine function.

[0051] But not limited to this, in another embodiment, the waveform of the main support frame can also be in other forms. For example, the main support frame is composed of multiple eight-shaped unit modules connected end to end, and adjacent unit modules and the interior of the unit modules are connected by arc transition sections.

[0052] The connection support frame 200 is disposed on the outer surface, inner surface, or inside the sidewall of the connection film 500 to support the connection film 500 .

[0053] Specifically, the connecting support frame 200 is in a truncated cone shape as a whole, and the connecting support frame 200 is a truncated cone-shaped metal frame formed by shaping a metal wire.

[0054] It should be noted that the main support frame and the main body coating 300 are fixed by suturing with fiber threads, and the connecting support frame 200 and the connecting coating 500 are fixed by suturing with fiber threads.

[0055] The connecting support frame 200 includes a plurality of wave segments with peaks extending away from the branch coating 400 , and the plurality of wave segments are sequentially arranged along the circumferential direction of the connecting coating 500 and connected end to end to form a wave closed loop structure.

[0056] A straight line parallel to the axis of the main covering 300 is defined as a busbar, and a busbar intersecting the central axis of the connecting covering 500 is defined as an axial fold line. The axial fold line passes through the crest or trough of each main support frame, and the axial fold line passes through the crest of the corresponding waveform segment or through the trough between adjacent waveform segments, so that the abdominal main multi-branch stent can be radially folded through the axial fold line.

[0057] It is understandable that there are countless axial fold lines, and different positions correspond to different axial fold lines.

[0058] First, by setting up the main support frame and the connecting support frame 200, the abdominal main multi-branch stent in the expanded state can maintain its own shape and will not be deformed, thereby ensuring that the main body coating 300 can fit tightly with the inner wall of the tubular cavity, thereby preventing the abdominal main multi-branch stent from leaking internally. That is, such a setting greatly improves the sealing performance of the abdominal main multi-branch stent.

[0059] Furthermore, the planar unfolded structure of the main support frame along the circumferential direction of the main covering 300 is wavy, and the axial fold line passes through the crest or trough of each main support frame.

[0060] It can be seen from this that when the main support frame is folded in half along the radial direction, the crease (that is, the axial fold line) passes through the crest or trough of each main support frame. Since the main support frame extends along the circumferential direction of the main body coating 300, the tangent of the main support frame at the crest or trough is perpendicular to the axial fold line. At this time, the main support frame has the least resistance stress to folding, that is, the main support frame is easiest to be folded.

[0061] Furthermore, since the connecting support frame 200 is composed of multiple wave segments arranged in sequence along the circumferential direction of the connecting coating 500 and connected end to end to form a wave closed loop structure, and the axial broken line passes through the crest of the corresponding wave segment or through the trough between adjacent wave segments.

[0062] It can be seen from this that when the main support frame is folded in half along the radial direction, the crease (that is, the axial fold line) passes through the crest of the corresponding waveform segment or through the trough between adjacent waveform segments. Since the connecting support frame 200 is in a circular ring shape surrounding the branch coating 400, the tangent line of the connecting support frame 200 at the crest or trough is also perpendicular to the axial fold line. At this time, the resistance stress generated by the connecting support frame 200 to folding is the smallest, that is, the connecting support frame 200 is easiest to be folded.

[0063] Therefore, in summary, the abdominal main multi-branch stent provided in the present application not only has a strong sealing performance, but can also be folded and compressed along its own radial direction to facilitate delivery into the tubular cavity.

[0064] In one embodiment, the central axis of the connecting coating 500 and the axis of the main body coating 300 are defined as a vertical plane, and a straight line perpendicular to the vertical plane and intersecting with the central axis of the connecting coating 500 is defined as a radial fold line. The radial fold line passes through the gap between adjacent main support frames, and the radial fold line passes through the crest of the corresponding waveform segment or through the trough between adjacent waveform segments, so that the abdominal main multi-branch stent can be axially folded through the radial fold line.

[0065] Such an arrangement enables the abdominal main multi-branch stent to be axially folded, reducing the length of the abdominal main multi-branch stent, and further compressing the abdominal main multi-branch stent.

[0066] Furthermore, in one embodiment, Figure 3 As shown, there are four waveform segments, which are defined as the first band 210, the second band 220, the third band 230 and the fourth band 240. The first band 210, the second band 220, the third band 230 and the fourth band 240 are connected end to end in sequence to form a connecting support frame 200.

[0067] The axial fold line passes through the trough between the first wave segment 210 and the fourth wave segment 240 , and the axial fold line passes through the trough between the second wave segment 220 and the third wave segment 230 .

[0068] The radial fold line passes through the trough between the first wave segment 210 and the second wave segment 220 , and the radial fold line passes through the trough between the third wave segment 230 and the fourth wave segment 240 .

[0069] With this arrangement, the connecting support frame 200 has a simple structure and is easy to fold.

[0070] However, the present invention is not limited thereto. In other embodiments, the number of waveform segments may be six, eight, or ten, etc., which are not listed here one by one.

[0071] In one embodiment, if Figure 3 As shown, the abdominal main multi-branch stent further includes a sub-support frame 600 , which is disposed on the outer surface or inner surface or inside the side wall of the branch covering 400 to support the branch covering 400 .

[0072] Specifically, the branch support frame 600 and the branch covering membrane 400 are fixed by suturing with fiber thread.

[0073] The planar unfolded structure of the sub-support frame 600 along the circumferential direction of the branch covering 400 is wavy, and the axial fold line passes through the crest or trough of the sub-support frame 600, and the radial fold line passes through the crest or trough of the sub-support frame 600.

[0074] This arrangement, on the one hand, greatly enhances the support of the branch covering 400, preventing deformation and internal leakage of the branch covering 400. Furthermore, it increases the rigidity of the branch covering 400, facilitating its movement and adjustment. Furthermore, because the radial and axial fold lines pass through the crests and troughs of the sub-stent 600, respectively, the branch covering 400 and sub-stent 600 can also be folded to a certain extent, significantly improving the compressibility of the entire abdominal main multi-branch stent.

[0075] However, the present invention is not limited thereto. In other embodiments, the corresponding support structure may be formed by strengthening the structures of the main covering 300 , the branch covering 400 and the connecting covering 500 .

[0076] In one embodiment, the main body coating 300 includes a plurality of first annular pore areas (not shown) extending along its own circumference, and the main body coating 300 also includes a plurality of second annular pore areas (not shown) extending along its own circumference, and the first annular pore areas and the second annular pore areas are alternately arranged along the axial direction of the main body coating 300.

[0077] The first annular pore area is provided with a plurality of densely distributed first pores (not shown), and the second annular pore area is provided with a plurality of densely distributed second pores (not shown). The pore size of the first pores is greater than the pore size of the second pores.

[0078] This arrangement facilitates anchoring between the main body covering 300 and the inner wall of the tubular cavity. Specifically, the first pores have a larger pore size, making the first annular pore area more susceptible to cell growth and attachment on the inner wall of the tubular cavity. The second pores have a smaller average pore size, which prevents the second annular pore area from completely adhering to the inner wall of the tubular cavity.

[0079] Furthermore, in one embodiment, the distribution density of the first pores in the first annular pore region is greater than the distribution density of the second pores in the second annular pore region.

[0080] In one embodiment, the sealing performance of the branch covering 400 decreases as it moves from the main covering 300 to the branch covering 400. Since the pressure at the proximal end is higher, the sealing performance of the branch covering 400 near the main covering 300 (proximal end) is higher, which is more conducive to preventing the leakage of body fluids.

[0081] In one embodiment, if Figures 1-6 As shown, the main covering 300 includes a first end 310 and a second end 320 , and the branch covering 400 is disposed between the first end 310 and the second end 320 .

[0082] Along the direction from the first end 310 to the branch coating 400, the multiple main support frames are defined in sequence as a first metal frame 110, a second metal frame 120, and a third metal frame 130. The planar unfolded structures of the first metal frame 110, the second metal frame 120, and the third metal frame 130 along the circumferential direction of the main coating 300 all present simple harmonic waveforms, and the angular frequency of the unfolded structure of the first metal frame 110 and the angular frequency of the unfolded structure of the second metal frame 120 are both lower than the angular frequency of the unfolded structure of the third metal frame 130.

[0083] Along the direction from the second end 320 to the branch coating 400, the multiple main support frames are defined as a fourth metal frame 140, a fifth metal frame 150, and a sixth metal frame 160. The planar unfolded structures of the fourth metal frame 140, the fifth metal frame 150, and the sixth metal frame 160 along the circumferential direction of the main coating 300 all present simple harmonic waveforms, and the angular frequency of the unfolded structure of the fourth metal frame 140 and the angular frequency of the unfolded structure of the fifth metal frame 150 are both lower than the angular frequency of the unfolded structure of the sixth metal frame 160.

[0084] It is understandable that the greater the angular frequency, the denser the waveform. Therefore, such an arrangement can improve the support performance of the main support frame near the branch covering 400.

[0085] In one embodiment, the number of the second metal frame 120 is one or more. When the number of the second metal frame 120 is more than one, the second metal frames 120 are distributed at intervals.

[0086] Likewise, the number of the fifth metal frame 150 is one or more. When the number of the fifth metal frame 150 is more than one, the plurality of fifth metal frames 150 are distributed at intervals.

[0087] In one embodiment, if Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, the first metal frame 110 and the fourth metal frame 140 are arranged in mirror symmetry.

[0088] Such an arrangement makes the forces at both ends of the abdominal main multi-branch stent tend to be consistent, which is beneficial to improving the overall support of the abdominal main multi-branch stent.

[0089] However, the present invention is not limited thereto. In another embodiment, the first metal frame 110 and the fourth metal frame 140 are periodically arranged along the axial direction of the main body film 300 . That is, the first metal frame 110 and the fourth metal frame 140 are identical in shape except for their different positions.

[0090] Such a setting is conducive to improving the flexibility of the abdominal main multi-branch stent and helping the abdominal main multi-branch stent to adapt to larger bending angles.

[0091] In one embodiment, if Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, the second metal frame 120 and the fifth metal frame 150 are arranged in mirror symmetry.

[0092] Such an arrangement makes the forces at both ends of the abdominal main multi-branch stent tend to be consistent, which is beneficial to improving the overall support of the abdominal main multi-branch stent.

[0093] However, the present invention is not limited thereto. In another embodiment, the second metal frame 120 and the fifth metal frame 150 are periodically arranged along the axial direction of the main body coating 300 . That is, the second metal frame 120 and the fifth metal frame 150 are identical in shape except for their different positions.

[0094] Such a setting is conducive to improving the flexibility of the abdominal main multi-branch stent and helping the abdominal main multi-branch stent to adapt to larger bending angles.

[0095] In one embodiment, if Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, the third metal frame 130 and the sixth metal frame 160 are arranged in mirror symmetry.

[0096] Such an arrangement makes the forces at both ends of the abdominal main multi-branch stent tend to be consistent, which is beneficial to improving the overall support of the abdominal main multi-branch stent.

[0097] However, the present invention is not limited thereto. In another embodiment, the third metal frame 130 and the sixth metal frame 160 are periodically arranged along the axial direction of the main body film 300 . That is, the third metal frame 130 and the sixth metal frame 160 are identical in shape except for their different positions.

[0098] Such a setting is conducive to improving the flexibility of the abdominal main multi-branch stent and helping the abdominal main multi-branch stent to adapt to larger bending angles.

[0099] In one embodiment, the first metal frame 110 and the second metal frame 120 are arranged in mirror symmetry.

[0100] Such an arrangement makes the forces at various locations on the same end of the abdominal main multi-branch stent tend to be consistent, which is beneficial to improving the overall support of the abdominal main multi-branch stent.

[0101] But not limited to this, in another embodiment, Figure 6 As shown, the first metal frame 110 and the second metal frame 120 are periodically arranged along the axial direction of the main body film 300 . That is, the first metal frame 110 and the second metal frame 120 are identical in shape except for their different positions.

[0102] Such a setting is conducive to improving the flexibility of the abdominal main multi-branch stent and helping the abdominal main multi-branch stent to adapt to larger bending angles.

[0103] In one embodiment, the fourth metal frame 140 and the fifth metal frame 150 are arranged in mirror symmetry.

[0104] Such an arrangement makes the forces at various locations on the same end of the abdominal main multi-branch stent tend to be consistent, which is beneficial to improving the overall support of the abdominal main multi-branch stent.

[0105] But not limited to this, in another embodiment, Figure 6 As shown, the fourth metal frame 140 and the fifth metal frame 150 are periodically arranged along the axial direction of the main body film 300 . That is, the fourth metal frame 140 and the fifth metal frame 150 are identical in shape except for their different positions.

[0106] Such a setting is conducive to improving the flexibility of the abdominal main multi-branch stent and helping the abdominal main multi-branch stent to adapt to larger bending angles.

[0107] In one embodiment, if Figure 1-Figure 5 As shown, the third metal frame 130 includes a first corrugated bracket 131 and a second corrugated bracket 132, one of the first corrugated bracket 131 and the second corrugated bracket 132 is arranged on the outer peripheral side of the other, or one of the first corrugated bracket 131 and the second corrugated bracket 132 is arranged on the inner wall of the main body coating 300, and the other is arranged on the outer wall of the main body coating 300.

[0108] Such a configuration greatly improves the support of the third metal frame 130 to the main body film 300 .

[0109] Furthermore, in one embodiment, if Figure 1-Figure 5 As shown, the crests of the first corrugated bracket 131 and the crests of the second corrugated bracket 132 are staggered along the circumference of the main body coating 300 . Similarly, the troughs of the first corrugated bracket 131 and the troughs of the second corrugated bracket 132 are staggered along the circumference of the main body coating 300 .

[0110] Such an arrangement further improves the support of the first corrugated bracket 131 and the second corrugated bracket 132 to the main body coating 300 .

[0111] Preferably, the crest of the first corrugated support 131 and the trough of the second corrugated support 132 are arranged opposite to each other.

[0112] It should be noted that the peak amplitude of the first corrugated bracket 131 is not fixed. When blocked by the connecting film 500, the peak amplitude of the first corrugated bracket 131 is smaller. When not blocked by the connecting film 500, the peak amplitude of the first corrugated bracket 131 is larger.

[0113] In this way, the blank areas of the main body cover 300 can be better filled to prevent the blank areas of the main body cover 300 from lacking support.

[0114] Preferably, the sum of the wire diameters of the first corrugated bracket 131 and the second corrugated bracket 132 is greater than the wire diameter of the fifth metal frame 150. Furthermore, the wire diameters of the first corrugated bracket 131 and the second corrugated bracket 132 are both smaller than the wire diameter of the fifth metal frame 150.

[0115] It should be noted that the “wire diameter value” refers to the width dimension of the cross section of the slender body constituting the corrugated stent or metal frame, and can also be understood as the diameter dimension of an ordinary metal wire.

[0116] Such a setting can ensure the uniformity and compliance of the support of the abdominal main multi-branch stent.

[0117] In one embodiment, if Figure 1-Figure 5 As shown, the sixth metal frame 160 includes a third corrugated bracket 161 and a fourth corrugated bracket 162, and one of the third corrugated bracket 161 and the fourth corrugated bracket 162 is arranged on the outer peripheral side of the other, or one of the third corrugated bracket 161 and the fourth corrugated bracket 162 is arranged on the inner wall of the main body covering 300, and the other is arranged on the outer wall of the main body covering 300.

[0118] Such a configuration greatly improves the support of the sixth metal frame 160 to the main body film 300 .

[0119] Furthermore, in one embodiment, Figure 1-Figure 5 As shown, the crests of the third corrugated bracket 161 and the crests of the fourth corrugated bracket 162 are staggered along the circumference of the main body coating 300 . Similarly, the troughs of the third corrugated bracket 161 and the troughs of the fourth corrugated bracket 162 are staggered along the circumference of the main body coating 300 .

[0120] Such an arrangement further improves the support of the third corrugated bracket 161 and the fourth corrugated bracket 162 to the main body coating 300 .

[0121] Preferably, the crest of the third corrugated support 161 and the trough of the fourth corrugated support 162 are arranged opposite to each other.

[0122] It should be noted that the peak amplitude of the third corrugated bracket 161 is not fixed. When blocked by the connecting film 500, the peak amplitude of the third corrugated bracket 161 is smaller. When not blocked by the connecting film 500, the peak amplitude of the third corrugated bracket 161 is larger.

[0123] In this way, the blank areas of the main body cover 300 can be better filled to prevent the blank areas of the main body cover 300 from lacking support.

[0124] In one embodiment, if Figures 1-4As shown, the crests of the first corrugated bracket 131 and the crests of the third corrugated bracket 161 are arranged opposite each other along the circumference of the main body coating 300 , and the troughs of the first corrugated bracket 131 and the troughs of the third corrugated bracket 161 are arranged opposite each other along the circumference of the main body coating 300 .

[0125] The crests of the second corrugated bracket 132 and the crests of the fourth corrugated bracket 162 are oppositely arranged along the circumference of the main body coating 300 , and the troughs of the second corrugated bracket 132 and the troughs of the fourth corrugated bracket 162 are oppositely arranged along the circumference of the main body coating 300 .

[0126] Such an arrangement makes the forces at both ends of the connecting film 500 tend to be consistent, which is beneficial to improving the overall support of the two ends of the connecting film 500.

[0127] But not limited to this, in another embodiment, Figure 5 and Figure 6 As shown, the crests of the first corrugated bracket 131 and the crests of the third corrugated bracket 161 are staggered along the circumference of the main body coating 300 , and the troughs of the first corrugated bracket 131 and the troughs of the third corrugated bracket 161 are staggered along the circumference of the main body coating 300 .

[0128] The crests of the second corrugated bracket 132 and the crests of the fourth corrugated bracket 162 are staggered along the circumference of the main body coating 300 , and the troughs of the second corrugated bracket 132 and the troughs of the fourth corrugated bracket 162 are staggered along the circumference of the main body coating 300 .

[0129] Such a setting is conducive to improving the flexibility of the abdominal main multi-branch stent and helping the abdominal main multi-branch stent to adapt to larger bending angles.

[0130] In one embodiment, if Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the first metal frame 110 includes a fifth corrugated bracket 111 and a sixth corrugated bracket 112, and one of the fifth corrugated bracket 111 and the sixth corrugated bracket 112 is arranged on the outer peripheral side of the other, or one of the fifth corrugated bracket 111 and the sixth corrugated bracket 112 is arranged on the inner wall of the main body covering 300, and the other is arranged on the outer wall of the main body covering 300.

[0131] Such a configuration greatly improves the support of the first metal frame 110 to the main body film 300 .

[0132] Furthermore, in one embodiment, Figure 1 、 Figure 2 、 Figure 4 and Figure 5As shown, at least part of the wave crest of the fifth corrugated bracket 111 protrudes from the end of the main body covering 300 along the axial direction of the main body covering 300 .

[0133] Such a configuration is conducive to the abdominal main multi-branch stent being firmly stuck in the tube core of the delivery system through the fifth corrugated stent 111.

[0134] In one embodiment, if Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the fourth metal frame 140 includes a seventh corrugated bracket 141 and an eighth corrugated bracket 142, and one of the seventh corrugated bracket 141 and the eighth corrugated bracket 142 is arranged on the outer peripheral side of the other, or one of the seventh corrugated bracket 141 and the eighth corrugated bracket 142 is arranged on the inner wall of the main body covering 300, and the other is arranged on the outer wall of the main body covering 300.

[0135] Such a configuration greatly improves the support of the fourth metal frame 140 to the main body film 300 .

[0136] Furthermore, in one embodiment, if Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, at least part of the wave crest of the seventh corrugated bracket 141 protrudes from the end of the main body covering 300 along the axial direction of the main body covering 300 .

[0137] Such a configuration is conducive to the abdominal main multi-branch stent being firmly stuck in the tube core of the delivery system through the seventh corrugated stent 141.

[0138] In one embodiment, if Figures 1-6 As shown, the diameter of the branch covering 400 is smaller than the inner diameter of the first mounting hole, and the axial direction of the main covering 300 and the axial direction of the branch covering 400 are not parallel.

[0139] The connecting film 500 is in the shape of a truncated cone, with one end of the connecting film 500 connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main film 300 and connected to the edge of one end of the branch film 400. In addition, the branch film 400 is arranged on the outer side of the connecting film 500 (on the side away from the cavity of the main film 300), and the end of the branch film 400 away from the connecting film 500 extends in a direction away from the axis of the main film 300.

[0140] It should be noted that the main covering 300 is disposed in the main lumen, and the branch covering 400 is used to connect the branch lumens, so that body fluid in the main lumen passes through the main covering 300 and the branch covering 400 and enters the branch lumens.

[0141] Since the connecting coating 500 is in a truncated cone shape, and one end of the connecting coating 500 is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main coating 300 and connected to the edge of one end of the branch coating 400, the difference between the area of ​​the first mounting hole and the cross-sectional area of ​​the branch coating 400 is smaller than the surface area of ​​the connecting coating 500. It can be understood that compared with the direct connection of the main coating 300 to the branch coating 400, by providing the connecting coating 500, the movement range of the branch coating 400 can be greatly improved, that is, the branch coating 400 can be moved radially along the first mounting hole to facilitate adjustment of the position of the branch coating 400 so that the branch coating 400 is aligned with the corresponding branch lumen.

[0142] That is, the abdominal main multi-branch stent provided in this application can adapt to various anatomical forms.

[0143] In one embodiment, if Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the abdominal main multi-branch stent also includes a reference coating 700, and the side wall of the main coating 300 is also provided with a second mounting hole. One end of the reference coating 700 is connected to the edge of the second mounting hole, and the other end extends in a direction away from the main coating 300.

[0144] Specifically, the reference film 700 is disposed between the second metal frame 120 and the third metal frame 130 , or the reference film 700 is disposed between the fifth metal frame 150 and the sixth metal frame 160 .

[0145] It should be noted that the reference coating 700 acts as a reference. When installing the abdominal main multi-branch stent, the reference coating 700 is directly aligned with the corresponding branch lumen, and then the position of the other branch coatings 400 is adjusted. Therefore, the reference coating 700 does not need to be connected to the main coating 300 through the connecting coating 500.

[0146] Furthermore, in one embodiment, if Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the abdominal main multi-branch stent further includes a reference support frame 800 , which is disposed on the outer surface or inner surface or inside the side wall of the reference coating 700 to support the reference coating 700 .

[0147] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0148] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

[0149] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0150] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0151] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0152] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0153] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0154] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. An abdominal main multi-branch stent, characterized in that: The invention comprises a main support frame, a connecting support frame (200), a main body coating (300), a branch coating (400) and a connecting coating (500), wherein the main body coating (300) and the branch coating (400) are both cylindrical, and the connecting coating (500) is annular and surrounds the branch coating (400), and one or more first mounting holes are provided on the side wall of the main body coating (300), and each branch coating (400) is connected to the side of the first mounting hole through the corresponding connecting coating (500); The main support frame is used to support the main body coating (300), and a plurality of the main support frames are arranged along the axial direction of the main body coating (300), and the planar unfolding structure of each main support frame along the circumferential direction of the main body coating (300) is wavy; The connecting support frame (200) is used to support the connecting film (500), and the connecting support frame (200) comprises a plurality of waveform segments with peaks extending in a direction away from the branch films (400), and the plurality of waveform segments are sequentially arranged along the circumferential direction of the connecting film (500) and connected end to end to form a waveform closed loop structure; A straight line parallel to the axis of the main body coating (300) is defined as a busbar, and the busbar intersecting the central axis of the connecting coating (500) is defined as an axial fold line. The point where the axial fold line intersects the main support frame is a crest or trough of the main support frame. The two points where the axial fold line intersects the wavy closed-loop structure are two crests or two troughs on the wavy closed-loop structure that are symmetrical about the central axis of the connecting coating (500), so that the abdominal main multi-branch stent can be radially folded through the axial fold line.

2. The abdominal main multi-branch stent according to claim 1, characterized in that: The planar unfolding structure of each main support frame along the circumferential direction of the main body covering film (300) presents a simple harmonic waveform.

3. The abdominal main multi-branch stent according to claim 1, characterized in that: The central axis of the connecting coating (500) and the axis of the main body coating (300) are defined as a vertical plane, and a straight line perpendicular to the vertical plane and intersecting the central axis of the connecting coating (500) is defined as a radial fold line. The axial fold line does not intersect with the main support frame, and the two points where the radial fold line intersects with the wavy closed-loop structure are two crests or two troughs on the wavy closed-loop structure that are axially symmetrical about the central axis of the connecting coating (500), so that the abdominal main multi-branch stent can be axially folded through the radial fold line.

4. The abdominal main multi-branch stent according to claim 3, characterized in that: The number of the wave segments is four, which are respectively defined as a first wave segment (210), a second wave segment (220), a third wave segment (230) and a fourth wave segment (240); the first wave segment (210), the second wave segment (220), the third wave segment (230) and the fourth wave segment (240) are sequentially connected end to end to form the connecting support frame (200); The axial fold line passes through the trough between the first wave segment (210) and the fourth wave segment (240), and the axial fold line passes through the trough between the second wave segment (220) and the third wave segment (230); The radial fold line passes through the trough between the first wave segment (210) and the second wave segment (220), and the radial fold line passes through the trough between the third wave segment (230) and the fourth wave segment (240).

5. The abdominal main multi-branch stent according to claim 3, characterized in that: It also includes a sub-support frame (600), the sub-support frame (600) being used to support the branch covering membrane (400); The planar unfolding structure of the sub-support frame (600) along the circumferential direction of the branch coating (400) is wavy, the axial fold line passes through the crest or trough of the sub-support frame (600), and the radial fold line passes through the crest or trough of the sub-support frame (600).

6. The abdominal main multi-branch stent according to claim 1, characterized in that: The main body coating (300) includes a plurality of first annular pore areas extending along its own circumference, and the main body coating (300) also includes a plurality of second annular pore areas extending along its own circumference, and the first annular pore areas and the second annular pore areas are alternately arranged along the axial direction of the main body coating (300); The first annular pore area is provided with a plurality of densely distributed first pores, and the second annular pore area is provided with a plurality of densely distributed second pores. The pore size of the first pores is greater than the pore size of the second pores.

7. The abdominal main multi-branch stent according to claim 1, characterized in that: The main body covering (300) comprises a first end (310) and a second end (320), and the branch covering (400) is arranged between the first end (310) and the second end (320); Along the direction from the first end (310) to the branch coating (400), the plurality of main support frames are defined as a first metal frame (110), a second metal frame (120) and a third metal frame (130) in sequence, and the planar unfolding structures of the first metal frame (110), the second metal frame (120) and the third metal frame (130) along the circumferential direction of the main coating (300) all present simple harmonic waveforms, and the angular frequency of the unfolding structure of the first metal frame (110) and the angular frequency of the unfolding structure of the second metal frame (120) are both smaller than the angular frequency of the unfolding structure of the third metal frame (130); Along the direction from the second end (320) to the branch coating (400), the plurality of main support frames are defined as a fourth metal frame (140), a fifth metal frame (150) and a sixth metal frame (160) in sequence, and the planar unfolded structures of the fourth metal frame (140), the fifth metal frame (150) and the sixth metal frame (160) along the circumferential direction of the main coating (300) all present simple harmonic waveforms, and the angular frequency of the unfolded structure of the fourth metal frame (140) and the angular frequency of the unfolded structure of the fifth metal frame (150) are both smaller than the angular frequency of the unfolded structure of the sixth metal frame (160).

8. The abdominal main multi-branch stent according to claim 7, characterized in that: The first metal frame (110) and the fourth metal frame (140) are arranged in a mirror-symmetrical manner, or the first metal frame (110) and the fourth metal frame (140) are arranged in a periodic arrangement along the axial direction of the main body coating (300); And / or, the second metal frame (120) and the fifth metal frame (150) are arranged in a mirror-symmetrical manner, or the second metal frame (120) and the fifth metal frame (150) are arranged in a periodic arrangement along the axial direction of the main body coating (300); And / or, the third metal frame (130) and the sixth metal frame (160) are arranged in a mirror-symmetrical manner, or the third metal frame (130) and the sixth metal frame (160) are arranged in a periodic arrangement along the axial direction of the main body coating (300); And / or, the first metal frame (110) and the second metal frame (120) are arranged in a mirror-symmetrical manner, or the first metal frame (110) and the second metal frame (120) are arranged in a periodic arrangement along the axial direction of the main body coating (300); And / or, the fourth metal frame (140) and the fifth metal frame (150) are arranged in a mirror-symmetrical manner, or the fourth metal frame (140) and the fifth metal frame (150) are arranged in a periodic arrangement along the axial direction of the main body coating (300).

9. The abdominal main multi-branch stent according to claim 7, characterized in that: The third metal frame (130) includes a first corrugated bracket (131) and a second corrugated bracket (132), one of the first corrugated bracket (131) and the second corrugated bracket (132) being sleeved on the outer peripheral side of the other, or one of the first corrugated bracket (131) and the second corrugated bracket (132) being arranged on the inner wall of the main body coating (300), and the other being arranged on the outer wall of the main body coating (300); The sixth metal frame (160) includes a third corrugated bracket (161) and a fourth corrugated bracket (162), one of the third corrugated bracket (161) and the fourth corrugated bracket (162) is sleeved on the outer peripheral side of the other, or one of the third corrugated bracket (161) and the fourth corrugated bracket (162) is arranged on the inner wall of the main body coating (300), and the other is arranged on the outer wall of the main body coating (300).

10. The abdominal main multi-branch stent according to claim 9, characterized in that: The wave crests of the first corrugated support (131) and the wave crests of the second corrugated support (132) are staggered along the circumference of the main body coating (300); And / or, the wave crest of the third corrugated support (161) and the wave crest of the fourth corrugated support (162) are staggered along the circumference of the main body coating (300); And / or, the wave crests of the first corrugated support (131) and the wave crests of the third corrugated support (161) are arranged opposite each other along the circumference of the main body coating (300), or the wave crests of the first corrugated support (131) and the wave crests of the third corrugated support (161) are arranged staggered along the circumference of the main body coating (300); And / or, the wave crests of the second corrugated bracket (132) and the wave crests of the fourth corrugated bracket (162) are arranged opposite to each other along the circumference of the main body coating (300), or the wave crests of the second corrugated bracket (132) and the wave crests of the fourth corrugated bracket (162) are arranged staggered along the circumference of the main body coating (300).

11. The abdominal main multi-branch stent according to claim 7, characterized in that: The first metal frame (110) includes a fifth corrugated bracket (111) and a sixth corrugated bracket (112), one of the fifth corrugated bracket (111) and the sixth corrugated bracket (112) being sleeved on the outer periphery of the other, or one of the fifth corrugated bracket (111) and the sixth corrugated bracket (112) being arranged on the inner wall of the main body coating (300), and the other being arranged on the outer wall of the main body coating (300); The fourth metal frame (140) includes a seventh corrugated bracket (141) and an eighth corrugated bracket (142), one of the seventh corrugated bracket (141) and the eighth corrugated bracket (142) is sleeved on the outer peripheral side of the other, or one of the seventh corrugated bracket (141) and the eighth corrugated bracket (142) is arranged on the inner wall of the main body coating (300), and the other is arranged on the outer wall of the main body coating (300).

12. The abdominal main multi-branch stent according to claim 11, characterized in that: At least part of the wave crest of the fifth corrugated support (111) protrudes from the end of the main body coating (300) along the axial direction of the main body coating (300); And / or, at least part of the wave crest of the seventh corrugated support (141) protrudes from the end of the main body coating (300) along the axial direction of the main body coating (300).

13. The abdominal main multi-branch stent according to claim 1, characterized in that: The diameter of the branch coating (400) is smaller than the inner diameter of the first mounting hole, and the axial direction of the main body coating (300) and the axial direction of the branch coating (400) are not arranged parallel to each other; The connecting film (500) is in the shape of a truncated cone, one end of the connecting film (500) is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main film (300) and connected to the edge of one end of the branch film (400), the branch film (400) is arranged on the outer side of the connecting film (500), and the end of the branch film (400) away from the connecting film (500) extends in a direction away from the axis of the main film (300).

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