Groove bracket

Abstract

The present application provides a kind of recess support, by setting support unit on the two sides of mesh area, support unit and mesh area can be relatively active to realize certain force buffering effect when being pressed, while gap is left between support unit and mesh area, space for deformation when being pressed, can provide better buffering effect, better maintain the overall morphology of bottom support sheet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and in particular to a groove stent. BACKGROUND

[0002] Aortic aneurysm and aortic dissection are currently serious diseases that endanger human life safety. If not actively treated, the aortic aneurysm and dissection will continue to expand, eventually rupture, causing serious complications and death. With the increasing number of patients with hypertension, hyperlipidemia and hyperglycemia, the incidence of aortic aneurysm and aortic dissection is also significantly increasing.

[0003] Traditional open surgery for aortic aneurysm and aortic dissection has high trauma, high mortality, long operation time, high incidence of postoperative complications and high surgical difficulty, while endovascular treatment has the characteristics of small trauma, fewer postoperative complications, short operation time and low surgical difficulty, and has gradually become the main method for treating aortic aneurysm and aortic dissection. By implanting a lumen stent in the aorta, the vascular lesions are isolated outside the lumen stent, and the blood flow is constrained to flow through the inside of the lumen stent, thereby achieving the purpose of protecting the blood vessels.

[0004] When the aneurysm or the aortic dissection is located on the aorta near the branch blood vessels, the implanted lumen stent can block the openings of the branch blood vessels, thereby causing the blood flow of the branch blood vessels to be blocked. One of the current solutions to this problem is to provide a groove on the stent, and a window allowing blood to pass through is provided on the groove, the window corresponding to the branch blood vessels, ensuring that the blood in the aorta enters the branch blood vessels through the window. The bottom of the groove is usually provided with a covering film to block the main stent passage. After being implanted in the blood vessel, the main stent is subjected to the radial extrusion force of the blood vessel, and the bottom of the groove is prone to deformation, causing obstruction to the branch openings and possibly compressing the groove space, thereby hindering the entry of the guide wire or the bridging stent into the branch. SUMMARY

[0005] In view of the deficiencies in the above-mentioned technologies, the present application provides a groove stent, which has a hollow tubular structure with openings at both ends. The groove stent comprises a main body stent and a bottom support sheet. The surface of the main body stent is provided with a groove, and the bottom support sheet is arranged at the bottom of the groove and close to the axial edge position of the groove. The bottom support sheet comprises a mesh area. At least one deformable support unit is connected to the side of the mesh area in the radial direction. The support unit comprises at least one movable end, which has a gap with the mesh area and can move relative to the mesh area in at least the radial direction.

[0006] In one embodiment, the support unit comprises a fixed end, and the support unit is connected to the mesh area through the fixed end.

[0007] In one embodiment, the support unit comprises a connecting rod, one end of the connecting rod is connected with the mesh area to form the fixed end, the other end extends towards the radial edge direction away from the mesh area to form a gap with the mesh structure.

[0008] In one embodiment, the support unit further comprises a buffer rod connected with the connecting rod, the buffer rod is movable relative to the connecting rod.

[0009] In one embodiment, the support unit comprises at least two connecting rods and at least one buffer rod, one end of the two connecting rods connected with the mesh area converges to form the fixed end, the other end of the two connecting rods extends obliquely away from each other from the fixed end and is connected with two ends of the buffer rod respectively.

[0010] In one embodiment, the support unit comprises at least two connecting rods and a plurality of buffer rods, the plurality of buffer rods are connected head to tail to form a polygonal rod; one end of the two connecting rods connected with the mesh area converges to form the fixed end, the other end of the two connecting rods extends obliquely away from each other from the fixed end and is connected with the two ends of the polygonal rod to form a polygonal grid.

[0011] In one embodiment, the angle of the included angle formed by one of the connecting rods and the buffer rod is greater than or equal to the angle of the included angle formed by the other connecting rod and the buffer rod.

[0012] In one embodiment, the lengths of the two connecting rods are equal or the length of one of the connecting rods is greater than the length of the other connecting rod.

[0013] In one embodiment, the minimum distance between one end of one of the connecting rods away from the mesh area and the mesh area is greater than the minimum distance between one end of the other connecting rod away from the mesh area and the mesh area.

[0014] In one embodiment, the mesh area comprises adjacent first row of grids and second row of grids in the axial direction; the first row of grids is closer to the axial edge of the groove than the second row of grids, and the support unit is connected with the side edge of the second row of grids in the radial direction.

[0015] In one embodiment, the first row of grids comprises a plurality of first grids arranged in the radial direction; the second row of grids comprises a plurality of second grids arranged in the radial direction; a single first grid and a single second grid are arranged correspondingly in the axial direction, and the number of the first grids is less than or equal to the number of the second grids.

[0016] In one embodiment, the first row of grids includes side grids located on both radial sides and an intermediate grid located between the two side grids, wherein the distance between the intermediate grid and the axial edge of the groove is less than the distance between the side grids and the axial edge of the groove.

[0017] A grooved bracket is a hollow tubular structure with openings at both ends. The grooved bracket includes a main bracket and a bottom support plate. The surface of the main bracket is provided with a groove. The bottom support plate is located at the bottom of the groove and near the axial edge of the groove. The radial dimension of the end of the bottom support plate near the axial edge of the groove is smaller than the maximum radial dimension of the bottom support plate.

[0018] In one embodiment, the bottom support plate includes a mesh region comprising an axially adjacent first row and second row of meshes; the first row of meshes is closer to the axial edge of the groove than the second row of meshes.

[0019] In one embodiment, the radial dimension of the first row of grids is less than or equal to the radial dimension of the second row of grids.

[0020] In one embodiment, the radial dimension of the first row of grids is smaller than the radial dimension of the axial edge of the groove.

[0021] The beneficial effects of this invention are: compared with the prior art, the grooved support provided by this invention, by setting support units on both sides of the mesh area, allows the support units and the mesh area to move relative to each other, thereby achieving a certain degree of force relief when under pressure.

[0022] The shock absorption effect is enhanced, and the gap between the support unit and the mesh area allows for deformation under pressure, providing better cushioning and maintaining the overall shape of the bottom support plate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the grooved bracket of the present invention;

[0024] Figure 2 This is a schematic diagram of the unfolded bottom support piece of the present invention;

[0025] Figure 3 This is a schematic diagram of the developing unit of the present invention on the bottom support sheet;

[0026] Figure 4 For the present invention Figure 2 Enlarged view of a portion of position A in the middle;

[0027] Figure 5 For the present invention Figure 2 Enlarged view of a portion of position B in the middle;

[0028] Figure 6 Figure 1 is a schematic diagram of the structure of a bottom support sheet according to the present application; Figure 2 Figure 2 is a partial enlarged view of the C position in Figure 1;

[0029] Figure 7 Figure 3 is a schematic diagram of the structure of a distal end bottom support sheet 302 in Example Four of the present application;

[0030] Figure 8 Figure 4 is a schematic diagram of the structure of a bottom support sheet in Example Two of the present application;

[0031] Figure 9 Figure 5 is a schematic diagram of the structure of a bottom support sheet in Example Three of the present application;

[0032] Figure 10 Figure 6 is a schematic diagram of the projection of a bottom support sheet in the radial plane according to the present application;

[0033] Figure 11 Figure 7 is a schematic diagram of the structure of a bottom support sheet forming a convex portion on the inner concave surface according to the present application;

[0034] Figure 12 Figure 8 is a schematic diagram of the structure of a bottom support sheet forming a "W" shape according to the present application;

[0035] Figure 13 Figure 9 is a schematic diagram of the structure of a bottom support sheet and a double-branch ostial stent according to the present application;

[0036] Figure 14 Figure 10 is a schematic diagram of the structure of a bottom support sheet and a double-branch ostial stent according to the present application;

[0037] Figure 15 Figure 11 is a schematic diagram of the structure of a bottom support sheet and a single-branch ostial stent according to the present application;

[0038] Figure 16 Figure 12 is a schematic diagram of the structure of a middle support sheet according to the present application;

[0039] Figure 17 Figure 13 is a schematic diagram of the projection of a middle support sheet in the radial plane according to the present application;

[0040] Figure 18 Figure 14 is a schematic diagram of the structure of a middle section of a groove stent according to the present application;

[0041] Figure 19 Figure 15 is a schematic diagram of the high wave interlacing of a middle support sheet according to the present application;

[0042] Figure 20 Figure 16 is a schematic diagram of the high wave relative of a middle support sheet according to the present application;

[0043] Figure 21 Figure 17 is a schematic diagram of the high wave partial relative and partial interlacing of a middle support sheet according to the present application;

[0044] Figure 22 Fig. 6 is a schematic view showing the opposite arc-shaped structure direction of the intermediate support sheet and the bottom support sheet of the present application;

[0045] Figure 23 Fig. 7 is a schematic view showing the same arc-shaped structure direction of the intermediate support sheet and the bottom support sheet of the present application. DETAILED DESCRIPTION

[0046] For better understanding of the concept of the present application, the embodiments of the present application will be described in detail with reference to the drawings. The following specific embodiments are only part of the embodiments of the present application, and are not intended to limit the present application.

[0047] For the convenience of description, spatial relative terms can be used in the description to describe the relationship of one element or feature to another element or feature as shown in the drawings, such as "inner", "outer", "inside", "outside", "lower", "below", "upper", "above", and the like. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device is turned over, then the element described as "below" or "under" the other element or feature would then be oriented "above" or "over" the other element or feature. Accordingly, the illustrative term "below" can include both the above and below orientations. The device can be otherwise oriented (rotated 90 degrees or otherwise) and the spatially relative descriptors used herein interpreted accordingly.

[0048] In order to more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined as the terms commonly used in the field of interventional medicine. Specifically, "distal end" refers to the end from which blood flows out, and "proximal end" refers to the end from which blood flows in, for example, after the stent is implanted, blood flows from the proximal end of the stent toward the distal end; "axial direction" refers to the length direction, and "radial direction" refers to the direction perpendicular to the "axial direction".

[0049] The "wave ring" (also referred to as a wave-shaped ring) in the present application is a closed ring structure, and the "wave unit" is an arc structure. The "wave ring" and the "wave unit" are made of a metal elastic material or a polymer material. The metal elastic material includes known materials implanted in medical devices or combinations of various biocompatible materials, such as two or more than two single metals in cobalt, chromium, nickel, titanium, magnesium, iron, and alloys thereof, and 316L stainless steel, nickel-titanium-tantalum alloy, etc., or other biocompatible metal elastic materials. The polymer material includes polylactic acid and other biocompatible materials. The "wave ring" and the "wave unit" both have radial expansion capability, can be radially contracted under external force, and can self-expand or expand by mechanical expansion (for example, by balloon expansion) to restore to the original shape and maintain the original shape after the external force is removed, so that they can be tightly attached to the inner wall of the lumen by the radial support force after being implanted in the lumen. The wave shape of the "wave ring" and the "wave unit" is not limited, including Z-shaped waves, M-shaped waves, V-shaped waves, sine waves, etc. The "wave ring" and the "wave unit" both include a plurality of wave crests (also referred to as proximal vertices), a plurality of wave troughs (also referred to as distal vertices), and wave stems connecting adjacent wave crests and wave troughs. One vertex (proximal vertex or distal vertex) and two wave stems connected to the vertex form a wave.

[0050] The "film" in the present application can isolate liquid to a certain extent, which can be made of polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), and other high-molecular materials with good biocompatibility.

[0051] Embodiment One

[0052] Please refer to Figure 1 The recess support 100 of the present embodiment has a hollow tubular structure with openings at both ends, and includes a main support 10.

[0053] The surface of the main support 10 is covered with a main film 11. The main film 11 can be arranged on the inner surface and / or the outer surface of the main support 10, or the main film 11 can be arranged on part of the inner surface and part of the outer surface of the main support 10.

[0054] Please refer to Figure 1, the main body support 10 can be divided into a proximal end section 2, a distal end section 1 and an intermediate section 7 between the proximal end section 2 and the distal end section 1 in the axial direction; the proximal end section 2 comprises a tubular proximal end support and a proximal end main body covering 11, and the proximal end main body covering 11 can be covered on the inner side and / or the outer side of the proximal end support by sewing, bonding, hot melting or the like. The proximal end support comprises a plurality of axially spaced main body wave coils; the distal end section 1 comprises a tubular distal end support and a distal end main body covering 11, and the distal end main body covering 11 can also be covered on the inner side and / or the outer side of the distal end support by sewing, bonding, hot melting or the like. The distal end support comprises a plurality of axially spaced main body wave coils.

[0055] The intermediate section 7 comprises an intermediate unit and at least one mesh cover 6. The intermediate unit comprises an intermediate main body covering 11 and an intermediate support (which can be omitted in other embodiments). The inner cavity formed by the intermediate main body covering 11 is in communication with the inner cavities formed by the proximal end main body covering 11 and the distal end main body covering 11; wherein the surface of the intermediate unit is provided with a groove 5, and the two sides of the mesh cover 6 in the circumferential direction are fixedly connected with the intermediate main body covering 11 by sewing, bonding, hot melting or the like, and at least a part of the mesh cover 6 forms a gap (or gap, cavity) with the outer surface of the intermediate unit, which can be in communication with the inner cavity of the branch support 8; wherein a plurality of branch supports 8 are provided, which are arranged near the proximal end position of the groove 5 and near the distal end position of the groove 5.

[0056] In one embodiment, the mesh cover 6 has an arc-shaped structure in the circumferential direction and is integrally woven into a mesh support structure by weaving wires; the projection of the mesh cover 6 on the radial plane corresponds to a central angle of the circle which is less than or equal to 120 degrees, so that the mesh cover 6 has good radial support force and ensures that there is enough space in the intermediate unit for blood flow.

[0057] In this embodiment, the edge of the groove 5 formed on the main body covering 11 is rectangular, that is, when the main body covering 11 is unfolded along the generatrix not passing through the groove 5, the groove 5 is rectangular; the groove 5 has a first edge, a second edge, a third edge and a fourth edge, and the four edges enclose the groove 5. Among them, the first edge and the second edge are opposite and consistent with the length extension direction of the groove support 100, and the third edge and the fourth edge are arranged opposite in the axial direction and closer to the end of the groove support 100 relative to the first edge and the second edge. It can be understood that in other embodiments, the groove 5 can also have other shapes, as long as the first edge and the second edge extend along the length extension direction of the groove support 100, for example, the first edge and the second edge can form a certain angle with the length extension direction of the groove support 100 (for example, the groove 5 is trapezoidal), or the first edge and the second edge are arc-shaped (the groove 5 is similar to an ellipse), and the present application does not limit the specific shape of the groove 5. It can also be understood that the groove 5 can be close to the proximal end of the groove support 100, or it can be close to the distal end of the groove support 100.

[0058] Please refer to Figure 2 The recess bracket 100 includes the bottom support sheet 3 close to the branch bracket 8 and arranged at the proximal end of the recess 5 and the bottom support sheet 3 arranged at the distal end of the recess 5, that is, the bottom support sheet 3 is arranged in the recess 5 close to the branch bracket 8; the two side bottom support sheets 3 have the same structure, the bottom support sheet 3 is woven into a mesh structure by interlacing and / or hooking each other by weaving wires; after the weaving wires are woven, the first end is connected to the last end, forming a mesh structure; the bottom support sheet 3 includes a mesh area 30 formed by interlacing and / or hooking each other by a plurality of wave units 36; the mesh area 30 is connected to at least one deformable support unit 33 in the radial direction; the support unit 33 is woven on both sides of the mesh area 30 in the radial direction of the woven structure of the bottom support sheet 3; the support unit 33 is connected to the mesh area 30 through the fixed end 334, and the support unit 33 includes at least one movable end 335, and there is a movable gap 333 between the movable end 335 and the mesh area 30, and the movable end 335 is movable relative to the mesh area 30 at least in the radial direction; since the support unit 33 is close to the first edge and the second edge of the recess 5 in the radial direction, that is, at both sides in the radial direction; therefore, when the recess 5 of the main bracket 10 is subjected to radial pressure, the support unit 33 is first subjected to force, thereby deforming and moving; at this time, since the movable end 335 is not directly in contact or connected with the mesh area 30, the force will not be immediately transferred to the mesh area 30 under the force, thereby better maintaining the overall shape of the mesh area 30.

[0059] In one embodiment, not shown in the figure, the support unit 33 includes a connecting rod 331, one end of the connecting rod 331 is connected to the mesh area 30 to form the fixed end 334, and the other end extends away from the mesh area 30 and close to the radial edge of the recess 5 to form the gap 333 between the mesh structure; the connecting rod 331 extends away from the mesh area 30 after being connected to the mesh area 30, so that the gap 333 is formed between the mesh area 30 at the other end far enough away; the gap 333 can ensure that the connecting rod 331 has a distance that can be displaced and moved when subjected to radial force, forming a buffer space to achieve a buffering effect, ensuring that the force will not be directly transmitted to the position of the mesh area 30, thereby better maintaining the overall shape of the mesh area 30.

[0060] In another embodiment, not shown in the figure, the connecting rod 331 is further connected with a buffer rod 332 at the end far away from the mesh area 30, the buffer rod 332 is preferably arranged in parallel or at an angle with the radial edge position of the groove 5, the buffer rod 332 can be used to connect with the film at the position, further the buffer rod 332 can be deformed preferentially to buffer the radial force when subjected to the radial force, further the force that cannot be buffered is transmitted to the connecting rod 331, and the connecting rod 331 is activated to buffer the radial force one step further, to ensure that the force is not directly transmitted to the position of the mesh area 30.

[0061] In another embodiment, please refer to Figure 2 and Figure 6 , the support unit 33 includes at least two connecting rods 331 and at least one buffer rod 332, the two ends of the two connecting rods 331 connected with the mesh area 30 meet to form a fixed end portion 334, the other ends of the two connecting rods 331 extend away from each other from the fixed end portion 334 and are respectively connected with the two ends of the buffer rod 332; in this embodiment, the two connecting rods 331 are connected by the way of meeting and then fixedly connecting with the mesh area 30, so that the two connecting rods 331 can slide relative to each other to a certain extent at the meeting position, so as to ensure that the bottom support sheet 3 can easily slide and deform at the meeting position when subjected to the radial force, preventing the radial force from being directly transmitted to the mesh area 30 to affect the overall shape; the two ends of the buffer rod 332 connected with the two connecting rods 331 form a movable end portion 335, the movable end portion 335 preferentially displaces to form a first-stage buffer structure when subjected to the radial force; further, the overall shape of the mesh area 30 is maintained to avoid excessive deformation affecting the internal space of the main channel.

[0062] Please further refer to Figure 2 , the mesh area 30 is formed by the overlapping and hooking of the wave units 36 in the axial direction to form the first row of meshes 34 and the second row of meshes 35 adjacent to each other; the first row of meshes 34 is closer to the axial edge position of the groove 5 than the second row of meshes 35, and the support unit 33 is connected with the side edge of the second row of meshes 35 in the radial direction; wherein, when the bottom support sheet 3 is installed at the bottom of the groove 5, the first row of meshes 34 is closer to the branch opening of the branch support 8 than the second row of meshes 35.

[0063] It can be understood that, please refer to 2 and Figure 7When the buffer rod 332 is one, the two connecting rods 331 and the buffer rod 332 of the support unit 33 enclose a triangular grid, which is located at the connecting position of the bottom support sheet 3 and the two radial edges of the groove 5, that is, the first edge and the second edge of the groove 5, and is connected with the position; after the triangular grid is connected with the second row of grids 35, the triangular grid is located in the middle of the first row of grids 34 and the second row of grids 35, and forms a ladder-shaped structure with the two rows of grids, respectively. The purpose of the structure is to make the bottom support sheet 3 as a whole a structure guiding to the branch port direction, which is similar to the structure of the transition section between the groove 5 and the branch port, so that the bottom support sheet 3 has good fitting degree; the woven wires of the second row of grids 35 are reversely crossed after the two side positions to form the fixed end portion 334 of the triangular grid, and then the woven wires continue to extend and then extend in the opposite direction and connect to form the movable end portion 335 of the two corners; the movable end portion 335 of the two corners extends to the axial direction of the main support 10, and the side of the two corners connected with each other is the buffer rod 332. The design of the two triangular grids can make the cross structure of the fixed end portion 334 of the bottom support sheet 3 slide to first displace relatively and buffer a part of the pressure when the bottom support sheet 3 is subjected to the radial force, and at the same time, the triangular grids will be close to the central axis in the radial direction, further buffering the radial pressure, so as to better ensure the edge shape and the overall shape of the bottom support sheet 3.

[0064] Example two

[0065] Please refer to Figure 9, the structure of the bottom support sheet 3 is substantially the same as that in the first embodiment, and the difference is that the buffer rods 332 of the support units 33 are provided with a plurality of buffer rods 332 which are connected end to end to form a polygonal rod; the two connecting rods 331 are connected to the mesh area 30 to form a fixed end portion 334, and the other ends of the two connecting rods 331 extend away from each other and are connected to the ends of the polygonal rod to form a polygonal mesh; preferably, the buffer rods 332 can be provided with two buffer rods 332 and an included angle between the two connecting rods 331, forming a wave angle structure, so that after being connected to the two connecting rods 331, a quadrilateral mesh is formed, and the two connecting rods 331 connected to the second mesh 351 can also realize mutual sliding, so that the two connecting rods 331 can provide a buffering effect when subjected to a radial force; unlike the triangular mesh, the two buffer rods 332 form a wave angle structure, which can form a trapezoidal structure between the second row of meshes 35 and the first row of meshes 34, and the purpose of setting the trapezoidal structure is the same as that in the first embodiment, that is, the branch opening of the branch support 8 is in a state of being gathered between the two ends of the groove 5 and the groove 5, and the radial length of the third and fourth edges of the groove 5 is greater than the radial length of the branch opening of the branch support 8, so that a blank section of the trapezoidal structure is formed, and the shape of the bottom support sheet 3 is set to be trapezoidal, and the purpose of this structure is to make the whole bottom support sheet 3 a structure that guides in the direction of the branch opening, which is similar to the structure of the transition section between the groove 5 and the branch opening, so that the bottom support sheet 3 has good fit.

[0066] Embodiment three

[0067] Please refer to Figures 7-9 , the structure of the bottom support sheet 3 is substantially the same as that in the first embodiment, and the difference is that the buffer rods 332 of the support units 33 are provided with a plurality of buffer rods 332 which are connected end to end to form a polygonal rod; the two connecting rods 331 are connected to the mesh area 30 to form a fixed end portion 334, and the other ends of the two connecting rods 331 extend away from each other and are connected to the ends of the polygonal rod to form a polygonal mesh; preferably, the buffer rods 332 can be provided with two buffer rods 332 and an included angle between the two connecting rods 331, forming a wave angle structure, so that after being connected to the two connecting rods 331, a quadrilateral mesh is formed, and the two connecting rods 331 connected to the second mesh 351 can also realize mutual sliding, so that the two connecting rods 331 can provide a buffering effect when subjected to a radial force; unlike the triangular mesh, the two buffer rods 332 form a wave angle structure, which can form a trapezoidal structure between the second row of meshes 35 and the first row of meshes 34, and the purpose of setting the trapezoidal structure is the same as that in the first embodiment, that is, the branch opening of the branch support 8 is in a state of being gathered between the two ends of the groove 5 and the groove 5, and the radial length of the third and fourth edges of the groove 5 is greater than the radial length of the branch opening of the branch support 8, so that a blank section of the trapezoidal structure is formed, and the shape of the bottom support sheet 3 is set to be trapezoidal, and the purpose of this structure is to make the whole bottom support sheet 3 a structure that guides in the direction of the branch opening, which is similar to the structure of the transition section between the groove 5 and the branch opening, so that the bottom support sheet 3 has good fit. Figure 9When the angles of the two connecting rods 331 with the buffer rod 332 are equal, the movable end portions 335 formed by the connection of the two connecting rods 331 and the buffer rod 332 will move simultaneously to perform buffering when the support unit 33 is subjected to a radial force, and the radial force buffering has a more balanced buffering effect; when the angles of the two connecting rods 331 with the buffer rod 332 are not equal, generally, the radial force received by the support unit 33 is guided in the intended direction so that the movable end portion 335 of the end with a smaller angle has a greater deformation amplitude; preferably, the movable end portion 335 of the support unit 33 closer to the first row of meshes 34 of the mesh area 30 has a smaller angle, so that the support unit 33 moves in the direction closer to the first row of meshes 34 when subjected to a radial force, thereby deforming the bottom support sheet 3 into a desired shape, such as a trapezoidal shape.

[0068] In another preferred scheme, please refer to Figure 8 , preferably, the movable end portion 335 of the support unit 33 closer to the second row of meshes 35 of the mesh area 30 has a smaller angle, and the buffer rod 332 is inclined away from the second row of meshes 35 at the movable end portion 335, and the purpose of setting this structure is to enable the triangular mesh to form a trapezoidal structure with the whole bottom support sheet 3 without being subjected to a radial force.

[0069] In another embodiment, the lengths of the two connecting rods 331 are equal or the length of one connecting rod 331 is greater than that of the other connecting rod 331, preferably, please refer to Figure 9 When the lengths of the two connecting rods 331 are equal, the movable end portions 335 formed by the connection of the two connecting rods 331 and the buffer rod 332 will move simultaneously to perform buffering when the support unit 33 is subjected to a radial force, and the radial force buffering has a more balanced buffering effect; please refer to Figure 2 and Figure 7 When the length of the connecting rod 331 of the support unit 33 closer to the first row of meshes 34 of the mesh area 30 is greater than that of the other connecting rod 331, the support unit 33 moves in the direction closer to the first row of meshes 34 when subjected to a radial force, thereby deforming the bottom support sheet 3 into a desired shape, such as a trapezoidal shape.

[0070] In another embodiment, the minimum distance between the end of one of the connecting rods 331 away from the mesh area 30 and the mesh area 30 is greater than the minimum distance between the end of the other connecting rod 331 away from the mesh area 30 and the mesh area 30; preferably, the minimum radial distance between the end of the connecting rod 331 away from the mesh area 30 and the mesh area 30 closer to the second row of meshes 35 is greater than the minimum radial distance between the end of the connecting rod 331 away from the mesh area 30 and the mesh area 30 closer to the first row of meshes 34; in this way, the connecting rod 331 closer to the second row of meshes 35 is more easily pressed against the first row of meshes 34 when subjected to a radial force, so that the first row of meshes 34 deforms radially earlier or more easily; the wave of the first row of meshes 34 close to the branch opening in the axial direction has a movement distance from the branch opening in the natural state, thereby ensuring that when the bottom support sheet 3 is compressed into the sheath with the recess support 100 under the radial pressure, it does not excessively press against the edge of the branch opening to cause the covering film at this position to be pierced.

[0071] Embodiment Four

[0072] Please refer to Figure 8 and Figure 9 , the structure of the bottom support sheet 3 is basically the same as that in Embodiments One to Three, except that the first row of meshes 34 includes a plurality of first meshes 341 arranged in the radial direction; the second row of meshes 35 includes a plurality of second meshes 351 arranged in the radial direction; a single first mesh 341 and a single second mesh 351 are arranged correspondingly in the axial direction, and in order to further adapt to the structure of the blank section of the branch opening and the edge of the recess 5 of the branch stent 8, the number of first meshes 341 is less than or equal to the number of second meshes 351; when the number of first meshes 341 is less than the number of second meshes 351, the overall structure of the bottom support sheet 3 can better form a trapezoidal structure.

[0073] In another embodiment, please refer to Figure 7 , when the number of first meshes 341 is equal to the number of second meshes 351, the axial dimension of the wave crest of the first mesh 341 of the intermediate mesh between the two side meshes of the first row of meshes 34 is greater than the axial dimension of the wave crest of the second mesh 351 of the second row of meshes 35; or it can be understood that the first row of meshes includes side meshes respectively located on the two sides in the radial direction and an intermediate mesh located between the two side meshes, and the distance between the intermediate mesh and the axial edge of the recess is less than the distance between the side mesh and the axial edge of the recess; the axial dimension here refers to the vertical distance between the wave crest and the wave trough in one mesh; this structure is also arranged to better form a trapezoidal structure for the overall structure of the bottom support sheet 3.

[0074] It can be understood that, as shown in the figure, the distance between the middle grids of the first row of grids 34 and the axial edge of the groove 5 is not affected by the number of the first grids 341 and the second grids 342, that is, even if the number of the first grids 341 is less than the number of the second grids 351, the distance between the middle grids and the axial edge of the groove 5 can be set to be less than the distance between the side grids and the axial edge of the groove 5.

[0075] Preferably, in the axial direction, the first grids 341 and the second grids 351 each include a plurality of proximal waves and distal waves connected to each other, and the proximal waves and the distal waves enclose the first grids 341 and the second grids 351 to form a polygonal grid structure, preferably a quadrilateral grid structure; the structure of the quadrilateral grid can also enhance the wall adhesion and support of the bottom support sheet 3 of the groove 5 to some extent. It can be understood that, in other embodiments, the more the first grids 341 and the second grids 351, the smaller the size of the mesh. Therefore, it is preferred that the number of grids in the same row of grids is 3-7.

[0076] In one embodiment, please refer to Figure 9 , the number of the first grids 341 of the first row of grids 34 is 3, and the number of the second grids 351 of the second row of grids 35 is 5-7, specifically 5.

[0077] Embodiment five

[0078] The structure of the bottom support sheet 3 is basically the same as that in Embodiments 1-4, except that, please continue to refer to Figure 2 and Figure 5 , the mesh area 30 includes a first mesh area 32 formed by the wave elements 36 overlapping each other and a second mesh area 31 formed by the wave elements 36 hooking each other; the second mesh area 31 is provided with at least two, respectively connected with the two sides of the first mesh area 32, and the support unit 33 is connected with the second mesh area 31; both the first mesh area 32 and the second mesh area 31 can realize radial contraction under external force and restore to the initial shape and maintain the initial shape after the external force is removed or through mechanical expansion (for example, through balloon expansion).

[0079] The bottom support sheet 3 comprises a first mesh area 32 and two second mesh areas 31 in the radial direction, and the two second mesh areas 31 are respectively arranged on both sides of the first mesh area 32 in the radial direction. In the natural unfolded state, the bottom support sheet 3 is curved from the center axis to the side edges in the radial direction, forming an arc-shaped structure, and the specific arc-shaped structure is concave towards the inner cavity of the main support 10 relative to the opening of the groove 5. The first mesh area 32 of the bottom support sheet 3 comprises a plurality of first direction wave rods 381 arranged at intervals and a plurality of second direction wave rods 382 arranged at intervals. The first direction wave rods 381 extend substantially along the first direction, and the second direction wave rods 382 extend substantially along the second direction. The first direction wave rods 381 and the second direction wave rods 382 are overlapped (or interwoven) to form a plurality of columns of quadrilateral meshes and a plurality of columns of cross units 38. Each column of quadrilateral meshes comprises a plurality of quadrilateral meshes arranged substantially along the axial direction, and adjacent quadrilateral meshes are connected to each other. Each column of cross units 38 comprises a plurality of cross units 38 arranged at intervals substantially along the axial direction. The quadrilateral mesh is substantially rhombic, and can also be square, rectangular or other shapes; four corners of the quadrilateral mesh hole are provided with four cross units 38. Each cross unit 38 comprises an intersection formed by the overlapping of the first direction wave rod 381 and the second direction wave rod 382; wherein, in some cross units 38, the first direction wave rod 381 is located on the outside of the second direction wave rod 382, and in some cross units 38, the first direction wave rod 381 is located on the inside of the second direction wave rod 382. In other embodiments, the first direction wave rod 381 in the first mesh area 32 is located on the outside of the second direction wave rod 382, or the first direction wave rod 381 is located on the inside of the second direction wave rod 382; the first mesh area 32 forms a quadrilateral mesh by overlapping or interweaving, and when the first mesh area 32 and the second mesh area 31 are simultaneously subjected to a radial force in the circumferential direction, the hooking structure of the second mesh area 31 makes the second mesh area 31 as a whole not easy to be deformed by arching in the radial direction; when the first mesh area 32 is subjected to a larger radial force, the middle position is preferably arched to offset the radial force, while the second mesh area 31 still maintains its original curved concave shape, and the support units 33 located on both sides of the second mesh area 31 are also slightly raised by being pressed.

[0080] See Figure 2 and Figure 4The first row of grids 34 and the second row of grids 35 are hookingly connected to form one or more hooking units 37 arranged at a radial interval in the two second meshed areas 31, each hooking unit 37 comprising a first hooking piece 371 and a second hooking piece 372. The first hooking piece 371 comprises a wave rising towards the distal direction, i.e. comprising a wave trough 3711 (also referred to as a distal vertex) and two wave rods 373 connected to the wave trough 3711; the second hooking piece 372 comprises a wave rising towards the proximal direction, i.e. comprising a wave peak 3721 (also referred to as a proximal vertex) and two wave rods 373 connected to the wave peak 3721. In this embodiment, the first hooking piece 371 and the second hooking piece 372 of each hooking unit 37 are hookingly connected to each other in the axial direction, so that the wave trough 3711 of the first hooking piece 371 and the wave peak 3721 of the second hooking piece 372 are axially movable relative to each other. It should be noted that "axially" here means that the line connecting the distal vertex of the first hooking piece 371 and the proximal vertex of the second hooking piece 372 is parallel to the axis of the bottom support sheet 3, or the included angle between the line and the axis of the bottom support sheet 3 is less than or equal to 45°.

[0081] In other embodiments, not shown in the figure, a plurality of first meshed areas 32 and a plurality of second meshed areas 31 can also be provided, or in other embodiments, only one first meshed area 32 and one second meshed area 31 can be provided, and the number of first meshed areas 32 and second meshed areas 31 is not limited by the present application.

[0082] In this embodiment, referring to Figure 1 , the bottom support sheet 3 is arranged in the groove 5 of the middle section and at least one axial end thereof is arranged close to the branch opening. As described above, the first row of grids 34 of the bottom support sheet 3 is arranged close to the branch opening. It can be understood that the axial end of the bottom support sheet 3 close to the branch opening, i.e. the edge of the first row of grids 34 abuts against the branch opening. It can be understood that the wave peak of the first row of grids 34 of the bottom support sheet 3 abuts against the bottom of the corresponding branch opening. The abutment of the bottom support sheet 3 and the branch opening can limit the wave peak of the bottom support sheet 3, thereby preventing it from being forced to rise. If there is a large blank section between the bottom support sheet 3 and the branch opening, the wave peaks at the two axial ends of the bottom support sheet 3 will rise when the bottom support sheet 3 is pressed, thereby causing the risk of piercing the surface coating and blocking the branch opening.

[0083] In another embodiment, the bottom support sheet 3 can be arranged at a distance from the edge of the branch opening at the axial end of the branch opening, i.e. the first row of meshes 34, and the distance can be in the range of 1 mm to 3 mm. The distance should not be too large to avoid the generation of a large blank section, and a small interval distance is appropriately set so that the first row of meshes 34 can be deformed in the direction of the branch opening by a certain distance without puncturing the cover film.

[0084] Embodiment six

[0085] In this embodiment, please refer to Figure 1 and Figure 18 The structure of the bottom support sheet 3 is generally the same as that in Embodiments One to Five, except that the branch support 8 includes a double-branch opening support 81 arranged in the lumen of the proximal section 2 and a single-branch opening support 82 arranged in the lumen of the distal section 1; the bottom support sheet 3 includes a proximal bottom support sheet 301 arranged close to the double-branch opening support 81 and a distal bottom support sheet 302 arranged close to the single-branch opening support 82; it can be understood that, since the branch opening supports at both ends have different structural characteristics, the proximal bottom support sheet 301 and the distal bottom support sheet 302 can have the same structure or different structures, for example, the number of first meshes 341 of the first row of meshes 34 of the proximal bottom support sheet 301 is the same as the number of second meshes 351 of the second row of meshes 35; the number of first meshes 341 of the first row of meshes 34 of the distal bottom support sheet 302 is different from the number of second meshes 351 of the second row of meshes 35, specifically, the number of first meshes 341 of the first row of meshes 34 is less than the number of second meshes 351 of the second row of meshes 35;

[0086] Please refer to Figure 12 , 13and 14, wherein the double-branch mouth support 81 comprises a first branch support 811 and a second branch support 812 arranged side by side in the radial direction, the first branch support 811 is provided with a first branch mouth 8111 near one end of the groove 5, and the second branch support 812 is provided with a second branch mouth 8121 near one end of the groove 5, the edges of the first branch mouth 8111 and the second branch mouth 8121 form a convex gap 813 protruding towards the inner surface of the main body support 10 on the side away from the inner surface of the main body support 10; and the convex gap 813 and the bottom of the double-branch mouth form a slightly curved "W" shape, which can guide the deformation of the proximal bottom support sheet 301 when it deforms, and the slightly curved "W" shape can guide the deformation of the proximal bottom support sheet 301. The purpose of forming a "W" shaped deformation structure for the proximal bottom support sheet 301 is to better adapt to the structure at the bottom of the double-branch mouth, so that the proximal bottom support sheet 301 can avoid uncontrollable deformation to block the branch mouth under the premise of providing sufficient radial support force, and can deform as expected.

[0087] It can be understood that, referring to Figure 15 At one end of the single-branch mouth support 82, the single-branch mouth support 82 is provided with a third branch mouth 821 near one end of the groove 5, and the third branch mouth 821 has a single-branch mouth shape that can guide the deformation of the distal bottom support sheet 302 due to the proximity of the distal bottom support sheet 302 to this position; here, the distal bottom support sheet 302 is expected to maintain its original arc-shaped structure that is recessed towards the inner cavity of the main body support 10, thereby avoiding blocking the third branch mouth 821; further, under the condition of pressure deformation, the distal bottom support sheet 302 will only form a larger bending arc of the arc-shaped structure that is recessed towards the inner cavity of the main body support 10 due to the guidance of the single-branch mouth shape of the third branch mouth 821, and will not form a "W" shaped deformation structure in the middle region, which is not expected to form a "W" shaped deformation structure here.

[0088] In one embodiment, the first mesh region 32 at least includes a column of intersecting cells 38 formed by a plurality of intersecting cells 38, and the connecting line of the intersection points of the column of intersecting cells 38 coincides with the central axis of the bottom support sheet 3; a column of intersection points can ensure that at least the first mesh region 32 of the bottom support sheet 3 near the middle position has weak radial support force, at which time the hooking structures of the second mesh regions 31 on both sides have better radial support force, in comparison, the first mesh region 32 will arch upwards when compressed in the radial direction, and the second mesh regions 31 on both sides will have weak deformation ability in the radial direction and will maintain the original concave shape, thereby ensuring the formation of a "W" shaped deformation structure.

[0089] It can be understood that, referring to Figure 13 , when the proximal end bottom support sheet 301 is close to or abuts against the first branch port 8111 and the second branch port 8121 of the double-branch stent 81, at least part or all of the first mesh area 32 is arranged opposite to the protruding gap 813 in the axial direction, so that the proximal end bottom support sheet 301 has a better arching deformation part that can be guided by the protruding gap 813, which is more conducive to the formation of a similar “W” shaped deformation structure; and the two second mesh areas 31 of the proximal end bottom support sheet 301 will maintain their original concave curved structure because they are not prone to arching deformation when subjected to radial force, which meets the demand that the first branch port 8111 and the second branch port 8121 of the branch stent 8 should not be blocked, so it is further preferred that the second mesh area 31 of the proximal end bottom support sheet 301 is arranged opposite to the first branch stent 811 and the second branch stent 812 in the axial direction, which can conform to the shape of the branch port, thereby avoiding the proximal end bottom support sheet 301 from being pressed and blocked by the two branch ports.

[0090] Embodiment Seven

[0091] In this embodiment, referring to Figure 11 and Figure 12 , the structure of the bottom support sheet 3 is basically the same as that in Embodiment Six and Embodiment Five, except that the proximal end bottom support sheet 301 is curved in an arc shape structure from the central axis to the two side edges in the circumferential direction, and a protruding portion 321 is formed on the inner concave surface of at least the middle part of the first mesh area 32, which is arranged for the following purposes: first, the arc structure is curved in the direction of the inner cavity of the main stent 10, which can better conform to the curved structure of the lower bottom of the branch stent 8, thereby effectively avoiding the blocking of the bottom support sheet 3 to the branch port; further, the protruding portion 321 is arranged on the inner concave surface of the curved arc structure of the proximal end bottom support sheet 301, i.e., the small bending side of the curved structure, so that the proximal end bottom support sheet 301 can better conform to the shape of the double branch port if it forms a similar W-shaped structure; it can be understood that the protruding portion 321 is a part or all of the first mesh area 32 that is slightly protruding on the surface of the inner concave surface of the small bending side of the arc structure, which can be pre-bent during the processing stage of the proximal end bottom support sheet 301, so that it itself has a slightly protruding structure, thereby when the bottom support sheet 3 is installed to the recess stent 100 and subjected to radial force, the first mesh area 32 itself has a pre-bent protruding portion 321, which is more prone to form a “W” shaped deformation structure, thereby reducing the risk of forming other shapes.

[0092] In another embodiment, not shown in the figures, one of the reasons for making the first mesh area 32 more prone to arching relative to the second mesh areas 31 on both sides is that the first mesh area 32 is more prone to deformation when subjected to radial force relative to the second mesh areas 31 on both sides. Therefore, it is preferred that the wire diameter of the first directional wave beams 381 and the second directional wave beams 382 of the first mesh area 32 is smaller than the wire diameter of the wave beams of the mesh of the second mesh areas 31. It is understood that, in the case of wave beam members, the wave beam member with smaller wire diameter requires less force to bend when subjected to force deformation, and the wave beam member with smaller wire diameter deforms more than the wave beam member with larger wire diameter when subjected to the same force.

[0093] In another embodiment, referring to Figure 2 , the first mesh area 32 and the second mesh area 31 each include two wave angles (wave peaks and wave valleys) in the axial direction, which are connected by wave beams extending in different directions. It is preferred that the wave width of the wave angles of the first mesh 341 and the second mesh 351 in the first mesh area 32 is smaller than the wave width of the wave angles of the first mesh 341 and the second mesh 351 in the second mesh area 31. It is understood that smaller wave angles result in smaller mesh size, and the mesh size of the first mesh area 32 is smaller than the mesh size of the second mesh area 31, so that the first mesh area 32 is more prone to deformation when subjected to radial force, and is more prone to arching at this position, and better forms the "W" shaped deformation structure of the bottom support sheet 3.

[0094] Embodiment Eight

[0095] Referring to Figure 1 and Figure 18In this embodiment, the structure of the grooved support 100 and the bottom support piece 3 is largely the same as that in embodiments one through seven. The difference is that the main body covering film 11 has a notch at the groove 5 position, and the bottom of the groove 5 is provided with a bottom covering film 51. The axial edge of the bottom covering film 51 is connected to the branch opening edges of the two branch supports 8 at the proximal and distal ends of the groove 5, and the radial edge is connected to the main body covering film 11. The bottom covering film 51 is used to isolate the inner cavity of the grooved support 100, and together with the branch supports 8 at both ends of the axial direction, it forms a receiving cavity. Preferably, the bottom covering film 51 covers the outer surface of the bottom support piece 3 away from the inner cavity of the main body support 10. That is, the bottom support piece 3 is located on the inner surface of the bottom covering film 51 located in the inner cavity of the main body support 10, and is connected to the bottom covering film 51 by stitching or bonding. It can be understood that this arrangement can prevent the bottom support piece 3 from being exposed in the receiving cavity, thereby avoiding hooking and pulling with the guide wire entering the receiving cavity.

[0096] Please refer to Figure 3 The grooved support 100 is also provided with a developing unit 9, which is located in the axial region where the first bottom support sheet 301 is located, and is connected to the bottom cover film 51 by stitching or bonding in this region, and is axially opposite to the protrusion gap 813. Furthermore, when the first bottom support sheet is installed in the groove 5, the developing unit 9 is opposite to the proximal edge of the groove 5. The developing unit 9 is used to indicate the position of the proximal edge of the groove 5 and the position of the double branch support when the grooved support is installed and used in the body.

[0097] Example 9

[0098] In this embodiment, please refer to Figure 17 and Figure 18 The structure of the grooved bracket 100 and the bottom support plate 3 is generally the same as that in embodiments five to eight. The difference is that in this embodiment, the grooved bracket 100 also includes an intermediate support plate 4. The intermediate support plate 4 is disposed in the groove 5 between the near-end bottom support plate 301 and the far-end bottom support plate 302. The intermediate support plate 4 forms at least one row of circumferentially extending grid support segments 41 by at least two overlapping wave units 36. In the naturally unfolded state, the intermediate support plate 4 bends from the central axis to the two side edges in the circumferential direction to form an arc structure. The intermediate support plate 4 configured in this way can first provide sufficient radial support force for the main bracket 10. Secondly, the intermediate support plate 4 is connected to the inner surface of the bottom covering film 51 located on the inner cavity side of the main bracket 10 by stitching or bonding, providing a support structure for the bottom covering film 51 on the surface of the groove 5. This ensures that it bulges to form sufficient main channel space, but does not cause excessive bulging, further avoiding irregular deformation.

[0099] It can be understood that the middle support sheet 4 can not be arranged in the groove 5, which is not shown in the figure; in this way, the area between the proximal end bottom support sheet 301 and the distal end bottom support sheet 302 is only covered by the bottom film 51, and the radial support force of this area is smaller, and irregular deformation is prone to occur when the stent is twisted; when the guide wire is inserted into the branch, the pressure in the groove 5 and the main channel is consistent, so that the film in this area is not raised, and after the bridging stent is implanted, the pressure in the main channel is greater than the pressure in the groove 5, so that the film in this area is raised to increase the space of the main channel.

[0100] In one embodiment, please refer to Figure 16 , the grid support section includes a plurality of third grids in the radial direction, and the wave width of the third grid in the area between the two radial sides of the grid support section is equal to the wave width of the third grid at the two radial sides.

[0101] In another embodiment, which is not shown in the figure, the wave width of the third grid in the area between the two radial sides of the grid support section is smaller than the wave width of the third grid at the two radial sides; it can be understood that the wave width of the third grid closer to the middle position is set to have a smaller wave width, which can make the middle support sheet 4 have better deformation ability near the middle position, so that the middle support sheet 4 is more easily formed into an arch structure when subjected to radial force, further ensuring that the raised portion forms a larger main channel space.

[0102] In a preferred embodiment, please refer to Figures 19-21 The wave unit 36 of the grid support section includes high waves 411 and low waves 412, the axial length of the high wave 411 is greater than or equal to the axial length of the low wave 412, and the high wave 411 is arranged opposite and / or staggered with the edge wave angle of the adjacent support sheet; the purpose of providing the high wave 411 with a longer axial length is that the high wave 411 can extend to the wave angle position close to the two side bottom support sheets 3 and the high wave 411 between the middle support sheets 4 can extend to the position close to each other, so that the arrangement of the high wave 411 can reduce the blank section between the bottom support sheet 3 and the middle support sheet 4 and the blank section between the middle support sheets 4, thereby effectively preventing the shortening of the groove 5 in the axial direction.

[0103] In one embodiment, please refer to Figure 20 , the high wave 411 of the middle support sheet 4 is in an opposite relationship with the edge wave angle of the adjacent bottom support sheet 3; the high wave 411 of the middle support sheet 4 is in an opposite relationship with the high wave 411 of the adjacent middle support sheet 4.

[0104] In another embodiment, please refer to Figure 19, the high wave 411 of the intermediate support sheet 4 is in a staggered relationship with the edge wave angle of the adjacent bottom support sheet 3; the high wave 411 of the intermediate support sheet 4 is in a staggered relationship with the high wave 411 of the adjacent intermediate support sheet 4.

[0105] In a preferred embodiment, please refer to Figure 21 , the high wave 411 of the intermediate support sheet 4 is in a relative relationship with the edge wave angle of the adjacent bottom support sheet 3; the high wave 411 of the intermediate support sheet 4 is in a staggered relationship with the high wave 411 of the adjacent intermediate support sheet 4.

[0106] In an embodiment, please refer to Figure 18 , the intermediate support sheet 4 is provided with at least two sheets and is symmetrically arranged along the center line of the groove 5.

[0107] In a preferred embodiment, the wire diameter of the woven wire of the intermediate support sheet 4 is greater than or equal to the wire diameter of the bottom support sheet 3; preferably, it is greater than the wire diameter of the bottom support sheet 3, so that the intermediate support sheet 4 can provide greater radial support force to support the overall shape of the groove 5.

[0108] In an embodiment, please refer to Figure 23 , the intermediate support sheet 4 is curved in the circumferential direction from the center axis to the two side edges to form an arc-shaped structure; the bending direction of the arc-shaped structure of the intermediate support sheet 4 is the same as the bending direction of the arc-shaped structure of the bottom support sheet 3 in the groove 5, both bending towards the inner cavity of the groove bracket 100; the same bending direction can make the bottom support sheet 3 and the intermediate support sheet 4 together provide better radial support force.

[0109] Preferably, please refer to Figure 17 and Figure 22 , when the intermediate support sheet 4 is installed into the groove 5, it protrudes to form an arch-shaped structure away from the inner cavity direction of the main bracket 10 relative to the opening of the groove 5; when the bottom support sheet 3 is installed into the groove 5, it is recessed to form a concave structure towards the inner cavity of the main channel; the step structure formed by the arch-shaped structure and the concave structure can block the blood flow to a certain extent, more easily form a thrombus, and promote the thrombosis process of the groove 5.

[0110] In an embodiment, the bottom support sheet 3 is integrally woven by a shape memory metal wire, or is integrally cut by a shape memory metal material.

[0111] Embodiment ten

[0112] In this embodiment, please refer to Figure 3 , Figure 7 and Figure 9, the structure of the luminal stent 100 is substantially the same as that of the luminal stent 100 in Embodiment One, except that the radial dimension of the bottom support sheet 3 at the end close to the axial edge of the groove 5 is smaller than the maximum radial dimension of the bottom support sheet 3; the end of the bottom support sheet 3 close to the axial edge of the groove 5 is the end close to the stent mouth of the branch stent 8, and the bottom support sheet 3 thus arranged can form a structure converging towards the central axis at least at the end close to the branch mouth of the branch stent 8, that is, a structure similar to a trapezoid; since the radial width of the branch stent 8 is smaller than the radial width at the axial edge position of the groove 5, a transition section similar to a trapezoidal structure is formed between the branch stent 8 and the axial edge of the groove 5, and thus the structure of the bottom support sheet 33 is similar to the structure of the transition section between the groove 5 and the branch mouth when the bottom support sheet 33 is installed at the bottom of the groove 5, so that the bottom support sheet 33 has good fitting degree.

[0113] In one embodiment, the bottom support sheet 3 comprises a mesh area, which comprises adjacent first and second rows of meshes 34 and 35 in the axial direction; the first row of meshes 34 is closer to the axial edge position of the groove 5 than the second row of meshes 35, and when the radial dimension of the first row of meshes 34 is smaller than that of the second row of meshes 35, the bottom support sheet 3 as a whole can form a structure similar to a trapezoid with different width at the two axial ends, so that the bottom support sheet 33 as a whole is a structure guiding towards the branch mouth, similar to the structure of the transition section between the groove 5 and the branch mouth, and also can make the bottom support sheet 33 have good fitting degree; and when the radial dimension of the first row of meshes 34 is equal to that of the second row of meshes 35, the end of the first row of meshes 34 close to the branch mouth is a wave angle structure, which can ensure that the bottom support sheet 3 forms a structure converging towards the central axis at least at the end close to the branch mouth of the branch stent 8.

[0114] In another embodiment, the radial dimension of the first row of meshes 34 is smaller than the radial dimension of the axial edge of the groove 5; here, since the radial width of the branch stent 8 is smaller than the radial width at the axial edge position of the groove 5, and generally the radial side edge of the bottom support sheet 3 needs to be connected with the radial side edge of the groove 5, so the radial dimension thereof needs to be at least equal to the radial dimension of the groove 5, and thus the radial dimension of the first row of meshes 34 being smaller than the radial dimension of the axial edge of the groove 5 is also to ensure that the first and second rows of meshes 34 and 35 of the bottom support sheet 3 form a structure suitable for the trapezoidal transition section, so as to ensure the fitting degree of the bottom support sheet 3 after installation, and avoid the problems of puncturing the covering film and irregular deformation affecting the shape of the branch mouth due to poor fitting degree of the bottom support sheet 3.

[0115] The above specific embodiments are only part of the embodiments of the present application, and are not a limitation on the present application, the specification cannot exhaust all embodiments of the present application, and part of the features of the above different embodiments can be replaced or combined with each other, and the person skilled in the art can also make simple replacement according to the actual needs, the concept of the present application is subject to the protection scope required.

Claims

1. A recessed bracket, characterized in that, The groove support is in a hollow tubular structure with openings at both ends, and comprises a main support and a bottom support sheet. The surface of the main support is provided with a groove, and the bottom support sheet is arranged at the bottom of the groove and close to the axial edge of the groove. The bottom support sheet comprises a mesh area. The side of the mesh area in the radial direction is connected to at least one deformable support unit, and the support unit comprises at least one movable end. The movable end has a gap with the mesh area, and the movable end is movable relative to the mesh area at least in the radial direction.

2. The recessed mount of claim 1, wherein, The support unit comprises a fixed end, and the support unit is connected to the mesh area through the fixed end.

3. The recessed mount of claim 2, wherein, The support unit comprises a connecting rod, one end of the connecting rod is connected to the mesh area to form the fixed end, and the other end extends away from the mesh area and close to the radial edge of the groove to form a gap with the mesh area.

4. The recessed mount of claim 3, wherein, The support unit further comprises a buffer rod connected to the connecting rod, and the buffer rod is movable relative to the connecting rod.

5. The recessed mount of claim 2, wherein, The support unit comprises at least two connecting rods and at least one buffer rod. One end of the two connecting rods connected to the mesh area intersects to form the fixed end, and the other end of the two connecting rods extends away from the fixed end in a direction away from each other and is connected to two ends of the buffer rod respectively.

6. The recessed mount of claim 2, wherein, The support unit comprises at least two connecting rods and a plurality of buffer rods, and the plurality of buffer rods are connected end to end to form a multi-edge rod. One end of the two connecting rods connected to the mesh area intersects to form the fixed end, and the other end of the two connecting rods extends away from the fixed end in a direction away from each other and is connected to the first and second ends of the multi-edge rod to form a polygonal grid.

7. The recessed mount of any of claims 5 or 6, wherein, The angle of the included angle formed by one of the connecting rods and the buffer rod is greater than or equal to the angle of the included angle formed by the other connecting rod and the buffer rod.

8. The recessed mount of claim 5 or 6, wherein, The lengths of the two connecting rods are equal or one of the connecting rods is longer than the other.

9. The recessed mount of claim 5 or 6, wherein, The minimum distance between one end of one of the connecting rods away from the mesh area and the mesh area is greater than the minimum distance between one end of the other connecting rod away from the mesh area and the mesh area.

10. The recessed mount of claim 1, wherein, The mesh area comprises adjacent first and second rows of grids in the axial direction. The first row of grids is closer to the axial edge of the groove than the second row of grids, and the support unit is connected to the side of the second row of grids in the radial direction.

11. The recessed mount of claim 10, wherein, The first row of grids comprises a plurality of first grids arranged in the radial direction, and the second row of grids comprises a plurality of second grids arranged in the radial direction. Single first and second grids are arranged correspondingly in the axial direction, and the number of first grids is less than or equal to the number of second grids.

12. The recessed mount of claim 11, wherein, The first row of grids comprises side grids located on both sides in the radial direction and an intermediate grid located between the two side grids. The distance between the intermediate grid and the axial edge of the groove is less than the distance between the side grids and the axial edge of the groove.

13. A recessed mount, characterized by The groove support is in a hollow tubular structure with openings at both ends, and comprises a main support and a bottom support sheet, the surface of the main support is provided with a groove, and the bottom support sheet is arranged at the bottom of the groove and close to the axial edge position of the groove; the radial dimension of one end of the bottom support sheet close to the axial edge of the groove is smaller than the maximum radial dimension of the bottom support sheet. The bottom support sheet comprises a mesh area, which comprises adjacent first and second rows of meshes in the axial direction; the first row of meshes is closer to the axial edge position of the groove than the second row of meshes.

14. The recessed mount of claim 13, wherein, The radial dimension of the first row of meshes is smaller than or equal to the radial dimension of the second row of meshes.

15. The recessed mount of claim 13, wherein, The radial dimension of the first row of meshes is smaller than the radial dimension of the axial edge of the groove.

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