Bracket

Abstract

The present invention provides a stent related to the field of medical devices, comprising a front tubular portion and a middle tubular portion connected in sequence; the front tubular portion comprises a plurality of front support monomers, and the middle tubular portion comprises a plurality of middle support monomers. Each front support monomer of the stent of the present invention forms a closed-loop structure around the axis of the front tubular portion, and the number of front joints formed by any two adjacent front support monomers is the same, which is conducive to achieving uniform distribution of radial support force of the front tubular portion; at least one of the middle support monomers forms an open-loop structure around the axis of the middle tubular portion, and the number of rear joints formed by any two adjacent middle support monomers is different, which is conducive to adapting to different wall adhesion performance requirements of different parts of the natural cavity of the human body.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a stent. Background Art

[0002] At present, cardiovascular disease has become the number one killer threatening human life and health. Vascular stent interventional treatment is the fastest growing and most widely used clinical method for the effective treatment of vascular occlusive diseases, with the characteristics of minimally invasive and high efficiency.

[0003] Vascular stents are used to implant diseased segments of the lumen to support the stenotic and occluded segments and keep them open. Among the performance indicators of vascular stents, the support performance of the stent plays a vital role in the operation process and the clinical effect after the operation, and will affect the long-term service ability of the stent. If the support of the stent is very poor, it will not be able to prop up the narrowed blood vessels, or even if it can prop up during the operation, the incidence of restenosis after the operation will be relatively high.

[0004] One end face of the bifurcated vascular stent disclosed in the Chinese patent application with publication number CN102462563A is designed as a non-flush structure, and a tubular stent is formed by a plurality of axially connected corrugated support members. However, some of the axially connected corrugated support members form an arc-shaped structure around the circumferential direction. Since this arc-shaped structure cannot form a closed structure in the circumferential direction, its radial support force distribution is uneven, which is not conducive to the stent achieving good wall adhesion performance.

[0005] Therefore, it is necessary to design a new type of bracket to avoid the above problems existing in the prior art. Summary of the invention

[0006] The object of the present invention is to provide a stent for use in a natural cavity of the human body, so as to provide uniform and good radial support force while adapting to different wall adhesion performance requirements of different parts of the natural cavity of the human body.

[0007] To achieve the above-mentioned purpose, the bracket of the present invention includes a front tubular portion and a middle tubular portion connected in sequence; the front tubular portion includes a plurality of front support monomers, and the middle tubular portion includes a plurality of middle support monomers; each of the front support monomers forms a closed-loop structure around the axis of the front tubular portion, and the number of front joints formed by connecting any two adjacent front support monomers is the same; at least one of the middle support monomers forms an open-loop structure around the axis of the middle tubular portion, and the number of rear joints formed by connecting any two adjacent middle support monomers is different.

[0008] The beneficial effects of the stent of the present invention are: each of the front support monomers forms a closed-loop structure around the axis of the front tubular portion, and the number of front joints formed by any two adjacent front support monomers is the same, which is beneficial to achieving uniform distribution of radial support force of the front tubular portion; at least one of the middle support monomers forms an open-loop structure around the axis of the middle tubular portion, and the number of rear joints formed by any two adjacent middle support monomers is different, which is beneficial to adapting to different wall adhesion performance requirements of different parts of the natural cavity of the human body.

[0009] Preferably, the plurality of front support monomers are connected in sequence along the axial direction of the front tubular portion to form a plurality of front sub-closed loop structures, and any two adjacent front sub-closed loop structures are connected to form the front joint portion. The beneficial effect is that the radial support force of the front tubular portion is evenly distributed, which is conducive to further improving the rigidity of the front tubular portion.

[0010] Further preferably, the plurality of front sub-closed loop structures are connected in sequence along the axial direction of the front tubular portion to form a first type of axial unit and a plurality of second type of axial units parallel to each other, and in the planar unfolded structure of the front tubular portion, the plurality of second type of axial units are symmetrically distributed relative to the first type of axial units. The beneficial effect is that the radial supporting force of the front tubular portion is evenly distributed.

[0011] Further preferably, the front sub-closed loop structure of the first type axial unit has a different structure from the front sub-closed loop structures of the second type axial units. The beneficial effect is that the front end face of the front tubular portion is conducive to forming an oblique opening inclined to the axis of the front tubular portion, so as to facilitate insertion into the intersection of the natural cavity of the human body.

[0012] Further preferably, the front sub-closed loop structures of the plurality of first-type axial units have the same structure, and the front sub-closed loop structures of the plurality of second-type axial units have the same structure. The beneficial effect is that the radial supporting force of the front tubular portion is evenly distributed.

[0013] Further preferably, each front sub-closed-loop structure of the first type axial unit is composed of four rod portions connected in sequence, and in the planar unfolded structure of the front tubular portion, two connected rod portions located on different sides of the axis of the front tubular portion have the same length, and two opposite rod portions have different lengths.

[0014] Further preferably, in each front sub-closed-loop structure of the first type axial unit, the two rod portions located on different sides of the axis of the front tubular portion and close to the front end face of the front tubular portion both have a first length, and the two rod portions located on different sides of the axis of the front tubular portion and away from the front end face of the front tubular portion both have a second length, and the first length is greater than the second length.

[0015] Further preferably, each front sub-closed-loop structure of the several second-type axial units is the same parallelogram structure, and the same parallelogram structure is formed by two opposite long rod portions and two opposite short rod portions, the length of the long rod portion is the first length, and the length of the short rod portion is the second length.

[0016] Preferably, any end surface of the closed-loop structure is inclined to the axis of the front tubular portion.

[0017] Preferably, the plurality of middle support monomers are connected in sequence along the axial direction of the middle tubular portion to form a plurality of neutron closed loop structures, and any two adjacent neutron closed loop structures are connected to form the rear joint portion. The beneficial effect is that it is conducive to further improving the rigidity of the middle tubular portion.

[0018] Further preferably, the plurality of neutron closed-loop structures are connected in sequence around the axis of the middle tubular portion to form a plurality of radial units parallel to each other, and the number of neutron closed-loop structures in each radial unit is not exactly the same.

[0019] Further preferably, in the planar unfolded structure of the middle tubular portion, the plurality of radial units are symmetrically distributed relative to the axis of the middle tubular portion.

[0020] Further preferably, the number of neutron closed-loop structures of each radial unit is different.

[0021] Further preferably, the number of neutron closed-loop structures of each radial unit increases along the axial direction of the middle tubular portion.

[0022] Preferably, the stent further comprises a plurality of connecting bridges, which are arranged between the front tubular portion and the middle tubular portion to connect the front tubular portion and the middle tubular portion. The beneficial effect thereof is that the flexibility of the stent is improved.

[0023] Further preferably, the plurality of front support monomers include an end front support monomer located at the end of the front tubular portion, each of the plurality of connecting bridges is connected to the end front support monomer, and adjacent connecting bridges among the plurality of connecting bridges are connected to different middle support monomers or the same middle support monomer.

[0024] Preferably, the middle tubular portion includes a terminal middle support monomer located at the terminal of the middle tubular portion, the terminal middle support monomer forms a closed loop structure around the axis of the middle tubular portion and is connected to the terminal of the front tubular portion. The beneficial effect is that it assists the terminal of the front tubular portion and the portion defined by the front end of the middle tubular portion to form a closed loop structure around the axis of the stent, thereby facilitating uniform distribution of radial support force.

[0025] Preferably, it further comprises a marking portion, which is arranged on the free end surface of the front tubular portion and is riveted or filled with developing metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the front section of a vascular stent in the prior art;

[0027] Figure 2 for Figure 1 A schematic diagram of the working state of the non-closed arc-shaped structure formed by the front section shown in the figure in the blood vessel;

[0028] Figure 3 A schematic diagram of the structure of a bracket according to an embodiment of the present invention;

[0029] Figure 4 for Figure 3 The front tubular portion shown is a schematic diagram of a planar unfolded structure formed along a cutting direction BB;

[0030] Figure 5 for Figure 4 A schematic diagram of a combined structure of a first type axial unit and a part of a second type axial unit formed by a partial front sub-closed loop structure shown;

[0031] Figure 6 for Figure 3 The schematic diagram of the planar unfolding structure formed by the connected front tubular portion and the middle tubular portion along the cutting direction BB is shown;

[0032] Figure 7 for Figure 3 The shown diagram is a schematic diagram of the planar unfolded structure of the bracket formed along the cutting direction BB. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0034] The planar unfolded structure described in the embodiment of the present invention specifically refers to a structure formed by cutting the side wall of a specific structure along the cutting direction and then spreading it on the same plane without wrinkles according to the actual shape and size of the plane per unit area.

[0035] Figure 1 It is a schematic diagram of the front section of a vascular stent in the prior art.

[0036] Reference Figure 1 In the front section 1, the structure formed by the first diamond structure 11, the second diamond structure 12, the third diamond structure 13, the fourth diamond structure 14 and the fifth diamond structure 15 around the axis of the front section 1 is a non-closed arc structure; similarly, the structure formed by the sixth diamond structure 16, the seventh diamond structure 17 and the eighth diamond structure 18 around the axis of the front section 1 is also a non-closed arc structure.

[0037] Figure 2 for Figure 1 The schematic diagram of the working state of the non-closed arc-shaped structure formed by the front section shown in the blood vessel.

[0038] Reference Figure 1 and Figure 2 When the front section 1 is placed in the blood vessel 31, the self-expansion of the front section 1 enables the inner wall of the blood vessel 31 to fit closely with the outer surface of the front section 1 to support the first part 33 of the blood vessel 31. However, since the front section 1 has a number of non-closed arc-shaped structures, the front section 1 cannot act on the second part 34 of the blood vessel 31, thereby causing the radial support force of the front section 1 to be unevenly distributed, which is not conducive to achieving good wall adhesion performance.

[0039] In order to solve the above problems existing in the prior art, an embodiment of the present invention provides a stent applied to a natural cavity of the human body, so as to provide uniform and good radial support force while adapting to different wall adhesion performance requirements of different parts of the natural cavity of the human body.

[0040] The natural cavities of the human body described in the embodiments of the present invention include blood vessels, digestive tract, urinary tract and reproductive tract.

[0041] Figure 3 Schematic diagram of the structure of the bracket of some embodiments of the present invention. Figure 4 for Figure 3 The front tubular portion is shown as a schematic diagram of a planar unfolded structure formed along a cutting direction BB.

[0042] Reference Figure 3The stent 4 includes a front tubular portion 41 and a middle tubular portion 42 connected in sequence along the central axis 43 of the stent 4, and the front tubular portion 41 and the middle tubular portion 42 together constitute the front section of the stent 4. After the stent 4 is placed in the natural cavity of the human body, the front section of the stent 4 is located at the proximal end and can adapt to the physiological curvature structure of the natural cavity of the human body through self-expansion.

[0043] The front tubular portion 41 includes a plurality of front support monomers. Figure 4 The front tubular portion 41 is composed of a first front support monomer 51, a second front support monomer 52, a third front support monomer 53 and a fourth front support monomer 54 which are sequentially connected along the direction of the central axis 43, and form a plurality of front sub-closed-loop structures 56. Any two adjacent front sub-closed-loop structures 56 are connected to form a front joint portion 57, so that the radial support force of the front tubular portion 41 is evenly distributed, which is conducive to further improving the rigidity of the front tubular portion 41.

[0044] In some embodiments of the present invention, referring to Figure 3 to Figure 4 Each of the front support monomers forms a closed loop structure connected end to end around the axis of the front tubular portion 41, thereby ensuring that when the stent 4 is placed in the blood vessel 31, the outer wall of the front tubular portion 41 can fit the inner wall of the blood vessel 31 to the greatest extent. The axis of the front tubular portion 41 coincides with the central axis 43.

[0045] In some embodiments of the present invention, each of the front support monomers is a wavy structure formed by connecting a plurality of V-shaped structures end to end in sequence. The wavy structure includes a plurality of crest structures and a plurality of trough structures, and in adjacent front support monomers, all trough structures of one front support monomer are connected to all crest structures of another front support monomer in a one-to-one correspondence.

[0046] Further, see Figure 4 , all the trough structures of the first front supporting monomer 51 and all the peak structures of the second front supporting monomer 52 are connected one by one to form a plurality of the front joints 57. The connection lines formed by the plurality of front joints 57 are distributed along the first fold line 551; the connection lines between the plurality of front joints (not shown in the figure) formed by the plurality of trough structures of the second front supporting monomer 52 and all the peak structures of the third front supporting monomer 53 are connected one by one to form a plurality of front joints (not shown in the figure) are distributed along the second fold line 552; the connection lines between the plurality of front joints (not shown in the figure) formed by the plurality of trough structures of the third front supporting monomer 53 and all the peak structures of the fourth front supporting monomer 54 are connected one by one to form a plurality of front joints (not shown in the figure) are distributed along the third fold line 553. The method of forming the front joint 57 by the peak structures and the trough structures is a well-known technical means for those skilled in the art, and will not be described in detail here.

[0047] In some embodiments of the present invention, the number of front joints formed by connecting any two adjacent front supporting units is the same. Figure 4 The number of front joints formed between any two adjacent front support monomers of the first front support monomer 51, the second front support monomer 52, the third front support monomer 53 and the fourth front support monomer 54 is 18, which is conducive to the uniform distribution of the radial support force of the front tubular portion 41.

[0048] In some embodiments of the present invention, referring to Figure 4 The planar unfolded structure of the front tubular portion 41 is symmetrical relative to the central axis 43 , so as to facilitate uniform distribution of the radial supporting force of the front tubular portion 41 .

[0049] In some embodiments of the present invention, a plurality of the front sub-closed-loop structures 56 are sequentially connected along the axial direction of the front tubular portion 41 to form a first type of axial unit and a plurality of second type of axial units that are parallel to each other.

[0050] Specifically, refer to Figure 4 In the planar unfolded structure of the front tubular portion 41, the two front sub-closed loop structures connected along the central axis 43 are the first middle front sub-closed loop structure 58 and the second middle front sub-closed loop structure 59, and the first middle front sub-closed loop structure 58 and the second middle front sub-closed loop structure 59 constitute the first type of axial unit. In addition to the first middle front sub-closed loop structure 58 and the second middle front sub-closed loop structure 59, the other front sub-closed loop structures of the front tubular portion 41 form a plurality of the second type of axial units (not shown) parallel to the central axis 43.

[0051] In some embodiments of the present invention, the plurality of second-type axial units are symmetrically distributed relative to the first-type axial units, so as to facilitate uniform distribution of the radial supporting force of the front tubular portion 41 .

[0052] Further, the front sub-closed loop structure of the first type axial unit has a different structure from the front sub-closed loop structures of the plurality of second type axial units, and the front sub-closed loop structures of the plurality of first type axial units have the same structure. Figure 4 The first intermediate front sub-closed loop structure 58 and the second intermediate front sub-closed loop structure 59 constituting the first type axial unit have the same structure, and the structure of any one of the first intermediate front sub-closed loop structure 58 and the second intermediate front sub-closed loop structure 59 is different from other front sub-closed loop structures of the front tubular portion 41 except the first intermediate front sub-closed loop structure 58 and the second intermediate front sub-closed loop structure 59.

[0053] Furthermore, the front sub-closed loop structures of the plurality of second-type axial units have the same structure. Figure 4 Except for the first middle front sub-closed loop structure 58 and the second middle front sub-closed loop structure 59, the other front sub-closed loop structures of the front tubular portion 41 have the same structure and are all parallelograms.

[0054] In some embodiments of the present invention, any end surface of the closed-loop structure formed by each front support unit around the axis of the front tubular portion 41 is inclined to the axis of the front tubular portion 41, so that the front tubular portion 41 is placed at the intersection of the natural cavity of the human body.

[0055] Further, see Figure 4 The closed loop structures formed by each front support monomer around the axis of the front tubular portion 41 are parallel to each other, so that each end face is inclined to the central axis 43 at the same inclination angle, so that the front tubular portion 41 is placed at the intersection of the natural cavity of the human body, which is conducive to the uniform distribution of the radial support force of the front tubular portion 41. The central axis 43 coincides with the axis of the front tubular portion 41, and the inclination angle refers to the acute angle between the end face and the central axis 43.

[0056] In some embodiments of the present invention, the inclination angle is 20-80 degrees.

[0057] Figure 5 for Figure 4 The schematic diagram of the combined structure of the first type of axial unit and part of the second type of axial unit formed by part of the front sub-closed loop structure is shown.

[0058] In some embodiments of the present invention, each front sub-closed-loop structure of the first type axial unit is composed of four rod portions connected in sequence, and in the planar unfolded structure of the front tubular portion 41, two connected rod portions located on different sides of the axis of the front tubular portion 41 have the same length, and two opposite rod portions have different lengths.

[0059] Specifically, refer to Figure 4 and Figure 5 Taking the first middle front sub-closed loop structure 58 as an example, the first middle front sub-closed loop structure 58 is surrounded by a first rod portion 61 , a second rod portion 62 , a third rod portion 63 and a fourth rod portion 64 .

[0060] Furthermore, the first rod portion 61 and the second rod portion 62 are located on different sides of the axis of the front tubular portion 41 and are connected to each other, the first rod portion 61 and the second rod portion 62 are close to the front end surface of the front tubular portion 41 and have a first length; the third rod portion 63 and the fourth rod portion 64 are located on different sides of the axis of the front tubular portion 41 and are connected to each other, the third rod portion 63 and the fourth rod portion 64 are far away from the front end surface of the front tubular portion 41 and have a second length.

[0061] Furthermore, the first length is greater than the second length, so that the first rod portion 61 and the fourth rod portion 64 are opposite to each other and have different lengths; the second rod portion 62 and the third rod portion 63 are opposite to each other and have different lengths, thereby causing one end of the first intermediate front sub-closed-loop structure 58 to be stretched along the central axis 43 toward the front end face of the front tubular portion 41.

[0062] Furthermore, among the plurality of second-type axial units, the first front sub-closed-loop structure 65 and the second front sub-closed-loop structure 66 connected to the first intermediate front sub-closed-loop structure 58 are symmetrical with respect to the central axis 43 and have the same structure.

[0063] Taking the first front sub-closed-loop structure 65 as an example, the first front sub-closed-loop structure 65 is in the shape of a parallelogram, and the parallelogram structure is formed by two opposite long rod portions (not shown in the figure) and two opposite short rod portions (not shown in the figure). The length of the long rod portion is the first length, the length of the short rod portion is the second length, and the length of the rod portion of the first front sub-closed-loop structure 65 connected to the first rod portion 61 is shorter than the length of the first rod portion, thereby helping to assist the front end face of the front tubular portion 41 to form an opening inclined surface inclined to the center axis 43.

[0064] Figure 6 for Figure 3 The diagram shows a planar unfolded structure of the connected front tubular portion and the middle tubular portion formed along the cutting direction BB.

[0065] The middle tubular portion 42 includes a plurality of middle support monomers, Figure 3 and Figure 6 The middle tubular portion 42 is composed of a first middle support monomer 71, a second middle support monomer 72, a third middle support monomer 73, a fourth middle support monomer 74 and a fifth middle support monomer 75 which are sequentially connected and parallel to each other along the direction of the central axis 43, and form a plurality of neutron closed-loop structures 76. Any two adjacent neutron closed-loop structures 76 are connected to form a middle joint (not shown in the figure), which is beneficial to further improve the rigidity of the middle tubular portion 42.

[0066] Specifically, the middle support monomer is a wavy structure formed by connecting a number of V-shaped structures end to end in sequence. The connection method between the middle support monomers and the formation method of the middle joint portion can be found in the above description of the front tubular portion 41, which will not be repeated here.

[0067] In some embodiments of the present invention, at least one of the middle support monomers forms an open-loop structure around the axis of the middle tubular portion 42, and the number of rear joints formed by any two adjacent middle support monomers is different, which is conducive to adapting to the different wall adhesion performance requirements of different parts of the natural cavity of the human body.

[0068] Furthermore, any end surface of the open-loop structure is perpendicular to the axis of the middle tubular portion 42 . The axis of the middle tubular portion 42 coincides with the central axis 43 .

[0069] Furthermore, among the N middle support monomers constituting the middle tubular portion 42, N-1 middle support monomers connected in sequence form an open loop structure around the axis of the middle tubular portion 42, and one middle support monomer forms a closed loop structure around the axis of the middle tubular portion 42, and N is a positive integer greater than or equal to 2.

[0070] Specifically, refer to Figure 3 and Figure 6 Among the five middle supporting monomers constituting the middle tubular portion 42, the second middle supporting monomer 72, the third middle supporting monomer 73, the fourth middle supporting monomer 74 and the fifth middle supporting monomer 75 connected in sequence around the central axis 43 form an open loop structure that cannot be closed from beginning to end, and the central axis 43 coincides with the axis of the middle tubular portion 42. The first middle supporting monomer 71 located at the end of the middle tubular portion 42 forms a closed loop structure around the central axis 43 that is closed from beginning to end.

[0071] In some embodiments of the present invention, the plurality of neutron closed-loop structures are sequentially connected around the axis of the middle tubular portion 42 to form a plurality of radial units parallel to each other, and the number of neutron closed-loop structures in each radial unit is not exactly the same.

[0072] Specifically, adjacent middle support monomers are connected to form the radial unit. Figure 6 Taking the radial unit formed by the first middle support monomer 71 and the second middle support monomer 72 as an example, the first middle support monomer 71 and the second middle support monomer 72 are connected to form 14 neutron closed-loop structures connected in a direction perpendicular to the central axis 43.

[0073] In the planar unfolded structure of the middle tubular portion 42 in some embodiments of the present invention, refer to Figure 6The plurality of radial units are symmetrically distributed relative to the central axis 43, and the central axis 43 coincides with the axis of the middle tubular portion (not shown in the figure).

[0074] In some embodiments of the present invention, the number of neutron closed-loop structures of each radial unit is different, and the number of neutron closed-loop structures of each radial unit increases along the axial direction of the middle tubular portion 42. The axial direction of the middle tubular portion 42 points from the front end face of the middle tubular portion 42 to the terminal end face of the middle tubular portion 42 along the axis of the middle tubular portion 42.

[0075] Specifically, refer to Figure 6 The first middle support monomer 71 and the second middle support monomer 72 are connected to form 14 neutron closed loop structures connected in a direction perpendicular to the central axis 43; the second middle support monomer 72 is connected to the third middle support monomer 73 to form 11 neutron closed loop structures connected in a direction perpendicular to the central axis 43; the third middle support monomer 73 is connected to the fourth middle support monomer 74 to form 6 neutron closed loop structures connected in a direction perpendicular to the central axis 43; the fourth middle support monomer 74 is connected to the fifth middle support monomer 75 to form 3 neutron closed loop structures connected in a direction perpendicular to the central axis 43. The central axis 43 coincides with the axis of the middle tubular portion 42.

[0076] In some embodiments of the present invention, referring to Figure 6 , several of the neutron closed-loop structures 76 have the same structure. Specifically, several of the neutron closed-loop structures 76 are all the same parallelogram structure.

[0077] In some embodiments of the present invention, referring to Figure 6 The support 4 further includes a plurality of connecting bridges 77 disposed between the front tubular portion 41 and the middle tubular portion 42 to improve the flexibility of the support 4 .

[0078] Specifically, refer to Figure 6 Among the several front supporting monomers of the front tubular portion 41, the terminal front supporting monomer 78 is located at the end of the front tubular portion 41, and each of the several connecting bridges is connected to the terminal front supporting monomer 78. Among the several connecting bridges, adjacent connecting bridges located on the same side of the central axis 43 are connected to different middle supporting monomers.

[0079] More specifically, see Figure 6 A plurality of connecting bridges located on one side of the central axis 43 are sequentially connected to the first middle supporting monomer 71 , the second middle supporting monomer 72 , the third middle supporting monomer 73 , the fourth middle supporting monomer 74 and the fifth middle supporting monomer 75 .

[0080] Furthermore, among the plurality of connection bridges, the plurality of connection bridges connected to the same middle supporting unit are symmetrically arranged relative to the central axis 43 , and the central axis 43 coincides with the axis of the middle tubular portion 42 .

[0081] In some embodiments of the present invention, referring to Figure 3 and Figure 6 The middle tubular portion 42 includes an end middle support monomer located at the end, and the end middle support monomer is the first middle support monomer 71. The first middle support monomer 71 forms a closed-loop structure around the axis of the middle tubular portion 42 and is connected to the end of the front tubular portion 41 to assist the end of the front tubular portion 41 and the part defined by the front end of the middle tubular portion 42 to form a closed-loop structure around the central axis 43, thereby facilitating the uniform distribution of the radial support force of the stent 4.

[0082] Figure 7 for Figure 3 The shown diagram is a schematic diagram of the planar unfolded structure of the bracket formed along the cutting direction BB.

[0083] Reference Figure 3 and Figure 7 The bracket 4 further includes a plurality of mutually parallel rear support monomers 81 to form the rear tubular portion 44 of the bracket 4. Each of the rear support monomers 81 forms a closed loop structure connected end to end around the central axis 43. One of the rear support monomers 81 is connected to the end of the middle tubular portion 42 via a plurality of the connecting bridges 77.

[0084] Specifically, the closed-loop structure formed by each of the rear supporting monomers 81 is perpendicular to the central axis 43 , and adjacent rear supporting monomers 81 are connected via a plurality of connecting bridges 77 .

[0085] More specifically, the end of the bracket 4 also has a sealing structure 45 formed by connecting a first end supporting monomer 82 and a second end supporting monomer 83 .

[0086] In some embodiments of the present invention, the bracket 4 further includes a marking portion, which is disposed on a free end surface of any one of the front tubular portion and the sealing structure and is riveted or filled with a developing metal. The developing metal is any one of metal tantalum, metal gold, metal platinum and metal tungsten.

[0087] Specifically, refer to Figure 3 The free end surface of the front tubular portion 41 of the bracket 4 and the free end surface of the sealing structure 45 are both provided with a marking portion 46 .

[0088] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A stent, applied to a natural cavity of a human body, characterized in that: The support comprises a front tubular portion and a middle tubular portion connected in sequence; The front tubular portion includes a plurality of front supporting monomers, and the middle tubular portion includes a plurality of middle supporting monomers; Each of the front supporting monomers forms a parallel closed loop structure around the axis of the front tubular portion, and the end surface of the front tubular portion is inclined to the axis of the front tubular portion, and the number of front joints formed by any two adjacent front supporting monomers is the same; The plurality of front support monomers are connected in sequence along the axial direction of the front tubular portion to form a plurality of front sub-closed loop structures, and any two adjacent front sub-closed loop structures are connected to form the front joint portion; The plurality of front sub-closed-loop structures are connected in sequence along the axial direction of the front tubular portion to form a first type of axial unit and a plurality of second type of axial units that are parallel to each other, and in the planar unfolded structure of the front tubular portion, the plurality of second type of axial units are symmetrically distributed relative to the first type of axial units; At least one of the middle supporting monomers forms an open ring structure around the axis of the middle tubular portion, and the numbers of rear joints formed by connecting any two adjacent middle supporting monomers are different.

2. The bracket according to claim 1, characterized in that: The front sub-closed-loop structure of the first type of axial unit has a different structure from the front sub-closed-loop structures of the second type of axial units.

3. The bracket according to claim 2, characterized in that: The front sub-closed-loop structures of the plurality of first-type axial units have the same structure, and the front sub-closed-loop structures of the plurality of second-type axial units have the same structure.

4. The bracket according to claim 3, characterized in that: Each front sub-closed-loop structure of the first type axial unit is composed of four rod portions connected in sequence, two connected rod portions located on different sides of the axis of the front tubular portion have the same length, and two opposite rod portions have different lengths.

5. The bracket according to claim 4, characterized in that: In each front sub-closed-loop structure of the first type axial unit, the two rod portions located on different sides of the axis of the front tubular portion and close to the front end face of the front tubular portion both have a first length, and the two rod portions located on different sides of the axis of the front tubular portion and away from the front end face of the front tubular portion both have a second length, and the first length is greater than the second length.

6. The bracket according to claim 5, characterized in that: Each front sub-closed-loop structure of the plurality of second-type axial units is the same parallelogram structure, and the same parallelogram structure is formed by two opposite long rod portions and two opposite short rod portions, the length of the long rod portion is the first length, and the length of the short rod portion is the second length.

7. The bracket according to claim 1, characterized in that: Any end surface of the closed-loop structure is inclined to the axis of the front tubular portion.

8. The bracket according to claim 1, characterized in that: The plurality of middle support monomers are connected in sequence along the axial direction of the middle tubular portion to form a plurality of neutron closed-loop structures, and any two adjacent neutron closed-loop structures are connected to form the rear joint portion.

9. The bracket according to claim 8, characterized in that: The plurality of neutron closed-loop structures are connected in sequence around the axis of the middle tubular portion to form a plurality of radial units parallel to each other, and the number of neutron closed-loop structures in each radial unit is not completely the same.

10. The bracket according to claim 9, characterized in that: In the planar unfolded structure of the middle tubular portion, the plurality of radial units are symmetrically distributed relative to the axis of the middle tubular portion.

11. The bracket according to claim 10, characterized in that: The number of neutron closed-loop structures of each radial unit is different.

12. The bracket according to claim 11, characterized in that: The number of neutron closed-loop structures of each radial unit increases along the axial direction of the middle tubular portion.

13. The bracket according to claim 1, characterized in that: The support further includes a plurality of connecting bridges, which are arranged between the front tubular portion and the middle tubular portion to connect the front tubular portion and the middle tubular portion.

14. The bracket according to claim 13, characterized in that: The plurality of front support monomers include a terminal front support monomer located at the end of the front tubular portion, each of the plurality of connection bridges is connected to the terminal front support monomer, and adjacent connection bridges among the plurality of connection bridges are connected to different middle support monomers or the same middle support monomer.

15. The bracket according to claim 1, characterized in that The middle tubular portion includes a terminal middle supporting unit located at a terminal of the middle tubular portion, and the terminal middle supporting unit forms a closed loop structure around an axis of the middle tubular portion.

16. The bracket according to claim 1, characterized in that It also includes a marking portion, which is arranged on the free end surface of the front tubular portion and is riveted or filled with developing metal.

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