Stent body and covered stent

Abstract

The application provides a stent body, which comprises a main body part. The main body part comprises a first wave-shaped connecting ring arranged in an axial direction, and the first wave-shaped connecting ring comprises a plurality of first wave-shaped units connected in a circumferential direction. Each first wave-shaped unit comprises a first high wave and a first low wave. The first high wave is close to a proximal end of the first wave-shaped unit, and the first low wave is close to a distal end of the first wave-shaped unit. The first high wave and the first low wave each comprise a first outer arc segment and a first inner arc segment arranged in the axial direction. The first outer arc segment of the first high wave is closer to the proximal end of the stent body than the first inner arc segment of the first high wave. The first outer arc segment of the first low wave is closer to the distal end of the stent body than the first inner arc segment of the first low wave. In the same first high wave or first low wave, the center of the first outer arc segment of the first high wave and / or the first low wave is offset to the first outer arc segment relative to the center of the first inner arc segment. The application also provides a covered stent, which comprises the stent body and a covering.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of medical devices, in particular to a stent body and a covered stent. BACKGROUND

[0002] At present, the main method for treating blood vessel diseases is minimally invasive intervention, which has small trauma to patients and high safety. The stent needs to be used in minimally invasive intervention. The existing stent is first cut into shape by a pipe material, then expanded in the radial direction by a mold, and finally heat set to keep the shape of the stent after expansion. After the stent is implanted into the diseased blood vessel segment, the stent can support the narrow and occluded segment of the blood vessel or occlude the blood vessel dissection break, reduce the elastic recoil and reshaping of the blood vessel, and keep the lumen blood flow unobstructed, so as to treat the blood vessel diseases.

[0003] However, since the existing stent generates internal stress during cutting, and the internal stress of the stent is unevenly distributed, the stent is unevenly stressed during radial expansion by the mold, which causes the stent to be unevenly expanded, so that the expansion degree of some parts of the stent is large and the expansion degree of some parts is small, which greatly affects the treatment effect of the stent on blood vessel diseases. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a stent body and a covered stent, which can be uniformly expanded during expansion, ensuring the uniformity of the stent body after expansion, and further ensuring the treatment effect of the stent on blood vessel diseases.

[0005] The present application first provides a stent body, which comprises a main body part, and the main body part comprises at least one first wave-shaped connecting ring arranged in the axial direction. The first wave-shaped connecting ring comprises a plurality of first wave-shaped units connected in the circumferential direction, and each first wave-shaped unit comprises a first high wave and a first low wave. The first high wave is close to the proximal end of the first wave-shaped unit and protrudes towards the proximal end of the stent body. One end of the first low wave in one of the first wave-shaped units, one end of the first high wave connected to the first wave-shaped unit, and the other end of the first low wave are connected to the first high wave of another first wave-shaped unit. The first low wave is close to the distal end of the first wave-shaped unit and protrudes towards the distal end of the stent body.

[0006] In the present application, the first high wave and the first low wave each comprise a first outer circular arc segment and a first inner circular arc segment arranged in the axial direction, the first outer circular arc segment of the first high wave is closer to the proximal end of the stent body than the first inner circular arc segment of the first high wave, and the first outer circular arc segment of the first low wave is closer to the distal end of the stent body than the first inner circular arc segment of the first low wave. In the same first high wave or first low wave, the center of the first outer circular arc segment of the first high wave and / or the first low wave is offset to the first outer circular arc segment relative to the center of the first inner circular arc segment.

[0007] The stent body provided by the present application, when being radially expanded, the main body part is radially expanded. The first wave-shaped connecting ring is radially expanded along with the expansion of the main body part, and the first wave-shaped unit is unfolded along with the expansion of the first wave-shaped connecting ring. Since the center of the first outer circular arc segment of the first high wave and / or the first low wave is offset relative to the center of the first inner circular arc segment towards the first outer circular arc segment, when the stent body is radially expanded, the maximum stress suffered by the corresponding first wave-shaped unit during the unfolding process can be reduced, the stress deformation of the corresponding first wave-shaped connecting ring during the expansion process can be reduced, the stress deformation amount of the main body part during the expansion process can be reduced, thereby ensuring that each part of the main body part can be uniformly expanded during the expansion process, ensuring the uniformity of the stent body after expansion, and thereby ensuring the treatment effect on the blood vessel disease.

[0008] In addition, the present application also provides a covered stent, comprising the above stent body and a covering connected to the stent body. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0010] Figure 1 is a structural schematic diagram of the stent body provided by the present application in an unexpanded state;

[0011] Figure 2 is a structural schematic diagram of the stent body provided by the present application in an unexpanded state; Figure 1 is an enlarged view of the II part of the stent body in

[0012] Figure 3 is an enlarged view of the III part in Figure 2

[0013] Figure 4 is a partial structural schematic diagram of the first wave-shaped connecting ring of the stent body provided by the present application in an expanded state;

[0014] Figure 5 is a structural schematic diagram of the seven first wave-shaped units of the first wave-shaped connecting ring of the stent body provided by the present application in an expanded state;

[0015] Figure 6 is a relationship schematic diagram between the offset amount of the first wave-shaped unit of the stent body and the maximum stress suffered by the first wave-shaped unit during the unfolding process;

[0016] Figure 7 ​is a schematic view of the relationship between the first amplitude height of the first wave-shaped connecting ring of the stent body in the expanded state and the maximum stress suffered by a first wave unit of the first wave-shaped connecting ring during the expansion process according to an embodiment of the present application;

[0017] Figure 8 is Figure 2 is an enlarged view of portion X of the stent body in

[0018] Figure 9 is a schematic view of the structure of the stent body in the unexpanded state according to a second embodiment of the present application;

[0019] Figure 10 is Figure 9 is an enlarged view of portion X of the stent body in

[0020] Figure 11 is Figure 9 is an enlarged view of portion XI of the stent body in

[0021] Figure 12 is a schematic view of the structure of the stent body in the unexpanded state according to a third embodiment of the present application;

[0022] Figure 13 is Figure 12 is an enlarged view of portion XIII of the stent body in

[0023] Figure 14 is Figure 12 is an enlarged view of portion XIV of the stent body in

[0024] Figure 15 is a schematic view of the structure of the stent body in the unexpanded state according to a fourth embodiment of the present application;

[0025] Figure 16 is Figure 15 is an enlarged view of portion XVI of the stent body in

[0026] Figure 17 is a schematic view of the structure of the stent body in the unexpanded state according to a fifth embodiment of the present application;

[0027] Figure 18 is Figure 17 is an enlarged view of portion XVIII of the stent body in

[0028] Figure 19 is Figure 17 is an enlarged view of portion XIX of the stent body in

[0029] Figure 20 is a schematic view of the structure of the stent body in the unexpanded state according to a sixth embodiment of the present application;

[0030] Figure 21 is an enlarged view of the XXI portion of the stent body in Figure 20

[0031] Figure 22 is an enlarged view of the XXII portion of the stent body in Figure 1

[0032] Figure 23 is an enlarged view of the XXIII portion in Figure 22

[0033] Figure 24 is an enlarged view of the XXIV portion in Figure 22

[0034] Figure 25 is a partial structural schematic view of the second wave-shaped connecting ring of the stent body in the expanded state according to an embodiment of the present application;

[0035] Figure 26 is an enlarged view of the XXVI portion in Figure 22

[0036] Figure 27 is an enlarged view of the XXVII portion in Figure 22

[0037] Figure 28 is a structural schematic view of the stent body in the unexpanded state according to a seventh embodiment of the present application;

[0038] Figure 29 is an enlarged view of the XXIX portion in Figure 28 DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0040] ​​​​​​​Furthermore, the description of the embodiments below is made with reference to the accompanying drawings, which illustrate specific embodiments to which the application can be put into practice. The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "lateral" and the like, are only with reference to the directions of the accompanying drawings, and therefore the directional terms used are for better, clearer illustration and understanding of the present application, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] Orientation definition: for the sake of clarity, in the following, the end close to the operator during the operation is referred to as "proximal end", and the end far from the operator is referred to as "distal end"; the axial direction refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical instrument; the radial direction refers to the direction perpendicular to the axial direction; the circumferential direction refers to the direction around the axial direction as the center line. The above definitions are only for the convenience of description, and cannot be understood as limiting the present application.

[0042] Please refer to Figure 1 , Figure 9 , Figure 12 , Figure 15 , Figure 17 , Figure 20 and Figure 27 , the present application provides a covered stent (not shown in the figure). The covered stent can be implanted in the vascular lesion segment to support the stenosis and occlusion segment of the blood vessel or to occlude the blood vessel dissection break, so as to achieve the interventional treatment of the vascular disease. The covered stent comprises a stent body 1000 and a covering film (not shown in the figure) connected to the stent body 1000. For example, after the covering film is attached to the stent body 1000, it can be connected to the stent body 1000 by sewing, hot pressing or gluing and the like. The covering film plays a protective role, avoiding friction between the stent body 1000 and the blood vessel and causing damage to the blood vessel.

[0043] In an embodiment, the covering film is attached to the inner circumferential surface and / or the outer circumferential surface of the stent body 1000. When the covering film is attached to the inner circumferential surface and the outer circumferential surface of the stent body 1000, the stent body 1000 is substantially completely covered by the covering film, further ensuring the safety of the covered stent implanted in the blood vessel.

[0044] In an embodiment, the covering film has multiple layers, and the stent body 1000 is located between any two layers of the covering film. The design of the multiple layers of the covering film can avoid the situation that the stent body 1000 is partially exposed to the outside due to the rupture of the single layer of the covering film, and ensure that the stent body 1000 is always covered by the covering film during the operation, thereby ensuring the safety of the covered stent implanted in the blood vessel.

[0045] Optionally, the covering film is made of a polymer material with good biocompatibility. For example, the covering film can be made of ePTFE (Expanded Poly Tetra Fluoroethylene), PET (Polyethylene Glycol Terephthalate), PTFE (Poly Tetra Fluoroethylene), etc., which are not limited in the present application. The covering film made of a material with good biocompatibility can avoid rejection reaction between the covering film stent implanted in the human body and the human body, which is beneficial to ensure the safety of the operation and reduce the risk of complications and chronic diseases.

[0046] In the present application, the covering film stent is made by connecting the stent body 1000 with a radial dimension of M (M>0) with the covering film. It can be understood that the stent body 1000 with a radial dimension of M can support the stenosis occlusion segment of the blood vessel or occlude the blood vessel dissection break, so as to achieve the interventional treatment of the vascular disease.

[0047] The following briefly describes the manufacturing process of the stent body 1000 with a radial dimension of M.

[0048] First, a tube material with an outer diameter of N (0<N<M) is selected and cut into a desired shape to form the stent body 1000 in an unexpanded state, at which time the radial dimension of the stent body 1000 is N; then, the stent body 1000 is radially expanded until the radial dimension of the stent body 1000 is M, at which time the stent body 1000 is in an expanded state. That is, the stent body 1000 in the expanded state can be implanted in the diseased blood vessel to achieve the interventional treatment of the vascular disease. In the illustrated embodiments, N is 2 mm (Millimeter), and M is 8 mm. In the drawings of various embodiments of the present application, Figure 4 and Figure 25 The local schematic view of the stent body 1000 after radial expansion is shown, and the other drawings show the state before radial expansion.

[0049] Optionally, the tube material can be made into the stent body 1000 in the unexpanded state by a femtosecond cutting process. The cutting precision of the femtosecond cutting process is high, which is beneficial to ensure the quality of the stent body 1000. In other embodiments, the tube material can also be made by ultrasonic cutting or tool cutting, etc., which are not limited in the present application.

[0050] Optionally, the stent body 1000 with a radial dimension of N can be radially expanded by a heat setting process until it has a radial dimension of M. When it has a dimension of M and is heat set, it will maintain the dimension of M in its natural state without radial pressure. When radial pressure is applied from the outside, it is compressed in the radial direction, and the stent body 1000 has elasticity. When the above-mentioned pressure is removed, the stent body 1000 will still recover to the radial dimension M. Specifically, the stent body 1000 is radially expanded by multiple heat treatments. For example, in the process of radially expanding the stent body 1000 with a radial dimension of 2 mm to a radial dimension of 8 mm, the stent body 1000 with a radial dimension of 2 mm is first sleeved into a mold with an inner diameter of 3 mm for heat treatment. Through stress release by heat treatment, the stent body 1000 is radially expanded, and at this time, the radial dimension of the stent body 1000 is 3 mm. Then, the stent body 1000 is sleeved into a mold with an inner diameter of 4 mm for heat treatment, and the stent body 1000 is radially expanded again. In this way, through multiple heat treatments, the stent body 1000 can be radially expanded until it has a radial dimension of 8 mm. The method of radially expanding the stent body 1000 by multiple heat treatments reduces the processing difficulty of radially expanding the stent body 1000 and ensures the processing precision of radially expanding the stent body 1000, thereby ensuring the quality of the stent body 1000.

[0051] The stent body 1000 provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0052] Please refer to Figure 1 to Figure 4 , Figure 9 , Figure 12 , Figure 15 , Figure 17 , Figure 20 and Figure 28 , the stent body 1000 includes a main body portion 10, and the main body portion 10 includes at least one first wave-shaped connecting ring 11 arranged in the axial direction, and the first wave-shaped connecting ring 11 includes a plurality of first wave-shaped units 110 connected in the circumferential direction. The first wave-shaped unit 110 includes a first high wave 111 and a first low wave 112. The first high wave 111 is close to the proximal end of the first wave-shaped unit 110 and protrudes towards the proximal end of the stent body 1000. One end of the first low wave 112 in one of the first wave-shaped units 110, one end of the first high wave 111 connected to the first wave-shaped unit 110, and the other end of the first low wave 112 are connected to the first high wave 111 of another first wave-shaped unit 110. The first low wave 112 is close to the distal end of the first wave-shaped unit 110 and protrudes towards the distal end of the stent body 1000.

[0053] The first high wave 111 and the first low wave 112 each include a first outer circular arc segment 113 and a first inner circular arc segment 114 arranged along an axial direction. The first outer circular arc segment 113a of the first high wave 111 is closer to the proximal end of the stent body 1000 than the first inner circular arc segment 114a of the first high wave 111. The first outer circular arc segment 113b of the first low wave 112 is closer to the distal end of the stent body 1000 than the first inner circular arc segment 114b of the first low wave 112. In the same first high wave 111 or the same first low wave 112, the center of the first outer circular arc segment 113 of the first high wave 111 and / or the first low wave 112 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114. The above-mentioned offset of the center can be understood as: first, the corresponding first outer circular arc segment 113 and the first inner circular arc segment 114 are not concentric; and second, on the basis of assuming that the centers of the first inner circular arc segment 114 and the first outer circular arc segment 113 are concentric, in fact, the center of the first outer circular arc segment 113 is offset to the direction of the first outer circular arc segment 113, and preferably, is offset to the direction of the first outer circular arc segment 113 along the axial direction.

[0054] The "in the same first high wave 111 or the same first low wave 112, the center of the first outer circular arc segment 113 of the first high wave 111 and / or the first low wave 112 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114" can be understood as:

[0055] Only limiting the first high wave 111 of the first wave unit 110, in the same first high wave 111, the center of the first outer circular arc segment 113 of the first high wave 111 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114 thereof;

[0056] Only limiting the first low wave 112 of the first wave unit 110, in the same first low wave 112, the center of the first outer circular arc segment 113 of the first low wave 112 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114 thereof;

[0057] Meanwhile, the first high wave 111 and the first low wave 112 of the first wave-shaped unit 110 are limited, in the same first high wave 111, the center of the first outer circular arc segment 113 of the first high wave 111 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114 of the first high wave 111, and in the same first low wave 112, the center of the first outer circular arc segment 113 of the first low wave 112 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114 of the first low wave 112. When the stent body 1000 is radially expanded, the main body 10 is radially expanded, the first wave-shaped connecting ring 11 is radially expanded along with the expansion of the main body 10, and the first wave-shaped unit 110 is unfolded along with the expansion of the first wave-shaped connecting ring 11. Because the center of the first outer circular arc segment 113 of the first high wave 111 and / or the first low wave 112 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114, the maximum stress of the corresponding first wave-shaped unit 110 in the unfolding process can be reduced, the stress deformation amount of the corresponding first wave-shaped connecting ring 11 in the expansion process can be reduced, the stress deformation amount of each part of the main body 10 in the expansion process can be reduced, and the uniformity of the stent body 1000 after expansion can be ensured, thereby ensuring the treatment effect of the stent body 1000 on the blood vessel disease. Similarly, when the stent body 1000 is expanded, the diameter of the stent body 1000 increases, and when the stent body 1000 is implanted into a blood vessel smaller in diameter than itself, the blood vessel exerts a radially inward pressure on the stent body 1000, so the diameter of the stent body 1000 after being implanted into the blood vessel is smaller than the diameter of the stent body 1000 outside the blood vessel, that is, the stent body 1000 is compressed in the radial direction after being implanted into the blood vessel. Because the center of the first outer circular arc segment 113 of the first high wave 111 and / or the first low wave 112 is offset to the first outer circular arc segment 113 relative to the center of the first inner circular arc segment 114, the maximum stress of the corresponding first wave-shaped unit 110 in the compression process can be reduced, the stress deformation amount of the corresponding first wave-shaped connecting ring 11 in the compression process can be reduced, the stress deformation amount of each part of the main body 10 in the compression process can be reduced, and the uniformity of the stent body 1000 after expansion can be ensured, thereby ensuring the treatment effect of the stent body 1000 on the blood vessel disease.

[0058] In the illustrated embodiment, in each first wave unit 110, the center of the first outer arc segment 113a of the first high wave 111 is offset from the center of the first inner arc segment 114a of the first high wave 111 towards the first outer arc segment 113a of the first high wave 111; and the center of the first outer arc segment 113b of the first low wave 112 is offset from the center of the first inner arc segment 114b of the first low wave 112 towards the first outer arc segment 113b of the first low wave 112. In this way, the maximum stress on the corresponding first wave unit 110 during unfolding is further reduced, and the uniform unfolding of the first wave unit 110 is facilitated, further ensuring the uniformity of the stent body 1000 after expansion.

[0059] In other embodiments, in each first wave unit 110, the center of the first outer arc segment 113a of the first high wave 111 can be offset from the center of the first inner arc segment 114a of the first high wave 111 towards the first outer arc segment 113a of the first high wave 111; the center of the first outer arc segment 113b of the first low wave 112 can be concentric with the center of the first inner arc segment 114b of the first low wave 112; or, the center of the first outer arc segment 113a of the first high wave 111 can be concentric with the center of the first inner arc segment 114a of the first high wave 111; and the center of the first outer arc segment 113b of the first low wave 112 can be offset from the center of the first inner arc segment 114b of the first low wave 112 towards the first outer arc segment 113b of the first low wave 112, which is not limited in the present application.

[0060] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments, the first high wave 111 and the first low wave 112 each include two connected first wave rods 115, and in one first wave unit 110, one of the first wave rods 115 of the first high wave 111 is connected to one of the first wave rods 115 of the first low wave 112. In one first wave unit 110, the first high wave 111 and the first low wave 112 are connected to form an integral whole, improving the structural stability of the first wave unit 110.

[0061] Specifically, the first high wave 111 and the first low wave 112 each further comprise a first arc portion 116. The first arc portion 116a of the first high wave 111 is connected between the proximal ends of the two first wave rods 115 of the first high wave 111. The two first wave rods 115 of the first high wave 111 are connected through the first arc portion 116a of the first high wave 111. The first arc portion 116b of the first low wave 112 is connected between the distal ends of the two first wave rods 115 of the first low wave 112. The two first wave rods 115 of the first low wave 112 are connected through the first arc portion 116b of the first low wave 112. The first arc portion 116a comprises the first outer arc segment 113a and the first inner arc segment 114a, and the first arc portion 116b comprises the first outer arc segment 113b and the first inner arc segment 114b.

[0062] In the illustrated embodiment, the two first wave rods 115 of the first high wave 111 are a first wave rod 115a and a first wave rod 115b, which are sequentially arranged in the circumferential direction. The proximal end of the first wave rod 115a is connected to one end of the first arc portion 116a, the other end of the first arc portion 116b is connected to the proximal end of the first wave rod 115b, and the distal end of the first wave rod 115a is arranged in a spaced manner with the distal end of the first wave rod 115b. The two first wave rods 115 of the first low wave 112 are a first wave rod 115c and a first wave rod 115d, which are sequentially arranged in the circumferential direction. The distal end of the first wave rod 115c is connected to one end of the first arc portion 116b, the other end of the first arc portion 116b is connected to the distal end of the first wave rod 115d, and the proximal end of the first wave rod 115c is arranged in a spaced manner with the proximal end of the first wave rod 115d.

[0063] In one first wave unit 110, the first wave rod 115c, the first wave rod 115d, the first wave rod 115a and the first wave rod 115b are sequentially arranged in the circumferential direction. The first wave rod 115d is connected to the first wave rod 115a, that is, one of the first wave rods 115 of the first high wave 111 is connected to one of the first wave rods 115 of the first low wave 112. Thus, in one first wave unit 110, the first high wave 111 and the first low wave 112 are connected to form a whole, thereby improving the structural stability of the first wave unit 110.

[0064] The first wave rod 115d and the first wave rod 115a are integrally formed. In this way, it is beneficial to the uniform stress distribution of the first wave unit 110, thereby facilitating the uniform expansion of the first wave unit 110, and further ensuring the uniformity of the stent body 1000 after being expanded. In other embodiments, the first wave rod 115d and the first wave rod 115a can also be stably connected through welding, gluing or buckle connection, etc., which is not limited in the present application.

[0065] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the first waveform connecting ring 11 ( Figure 2 The number of sections containing the long and short lines shown is seventeen. These seventeen first waveform connecting rings 11 are arranged axially and connected sequentially; please refer to the following for specific connection relationships. Each first waveform connecting ring 11 includes three or more first waveform units 110. Specifically, the first waveform connecting ring 11 located near the main body 10 includes eighteen first waveform units 110, the first waveform connecting ring 11 located at the far end of the main body 10 includes seventeen first waveform units 110, and the other fifteen first waveform connecting rings 11 each include eighteen first waveform units 110. The structure and dimensions of each first waveform unit 110 are identical.

[0066] In any first waveform connecting ring 11, any three first waveform units 110 that are sequentially adjacent along the circumferential direction are a first left waveform unit, a first middle waveform unit, and a first right waveform unit, with the first middle waveform unit located between the first left and first right waveform units. The first wave rod 115c of the first middle waveform unit is connected to the first wave rod 115b of the first left waveform unit; the first wave rod 115b of the first high wave 111 of the first middle waveform unit is connected to the first wave rod 115c of the first right waveform unit. Thus, in a first waveform connecting ring 11, each first waveform unit 110 can be connected circumferentially to form a whole, improving the structural stability of the first waveform connecting ring 11. The two first waveform units 110 located at both ends of the first waveform connecting ring 11 are not connected, i.e., the first waveform connecting ring 11 is an open-loop structure. In other embodiments, the two first waveform units 110 located at both ends of the first waveform connecting ring 11 can also be connected circumferentially, i.e., the first waveform connecting ring 11 is a closed-loop structure.

[0067] It should be noted that each of the first waveform units 110 in the first waveform connecting ring 11 can be integrally formed. This is beneficial to the uniform stress distribution in the first waveform connecting ring 11, which in turn is beneficial to the uniform expansion of the first waveform connecting ring 11, thereby ensuring the uniformity of the support body 1000 after expansion.

[0068] In other embodiments, the number of first waveform connecting loops 11 may be one or more other positive integers. The first waveform connecting loop 11 may also include only two first waveform units 110 or more first waveform units 110, which is not limited by the present invention.

[0069] It should be noted that the more the number of first wave units 110 in the first wave connecting ring 11, the more uniform the stress distribution of the first wave connecting ring 11 during the expansion process, and the more conducive to improving the uniformity of the stent body 1000 after expansion.

[0070] As shown in Figure 3 , when the stent body 1000 (as shown in Figure 1 ) is in an unexpanded state, the tangent of the first wave rod 115a and the tangent of the first wave rod 115b are parallel to the axial direction of the stent body 1000. The tangent of the first wave rod 115c and the tangent of the first wave rod 115d are parallel to the axial direction of the stent body 1000.

[0071] It should be noted that in the present application, the tangent of the first wave rod 115 of the first high wave 111 is parallel to the extension direction of the first wave rod 115 and tangent to the first outer arc segment 113a of the first high wave 111; the tangent of the first wave rod 115 of the first low wave 112 is parallel to the extension direction of the first wave rod 115 and tangent to the first outer arc segment 113b of the first low wave 112, which can be understood in the same way in the following, and will not be repeated. It can also be implemented in the embodiment shown in Figure 3 , the first wave rod 115a, 115b, 115c and 115d are all extended along a straight line direction, and the extension direction is defined as the extension direction of any long side of the first wave rod 115 or the extension direction of the center line of the first wave rod 115, and the tangent direction is the straight line direction. In other embodiments, if the extension direction of the first wave rod 115 is not a straight line, it is a curve, and the tangent is defined as the straight line direction of the connection of the two ends of any long side of the first wave rod 115, or the straight line direction of the connection of the two ends of the center line of the first wave rod 115. If the extension directions of all long sides of the first wave rod 115 are not parallel, any one long side is used as a reference; if there is a long side whose extension direction is not parallel to the extension direction of the center line, any one of the long side and the center line is used as a reference.

[0072] As shown in Figure 4 , when the stent body 1000 (as shown in Figure 1 ) in the unexpanded state is radially expanded to the expanded state, the tangent of the first wave rod 115a and the tangent of the first wave rod 115b are inclined relative to the axial direction of the stent body 1000, and the tangent of the first wave rod 115a and the tangent of the first wave rod 115b exist between them The first included angle. The tangent of the first wave rod 115c and the tangent of the first wave rod 115d are inclined relative to the axial direction of the stent body 1000, and the tangent of the first wave rod 115c and the tangent of the first wave rod 115d exist between them The second included angle, the first included angle and the second included angle are equal.

[0073] The included angle a between the tangent lines of the two first wave rods 115 in the same first high wave 111 or the same first low wave 112 ranges from 30° to 120° (a first included angle or a second included angle). At this time, not only the radial dimension of the main body part 10 meets the requirements, but also the stent graft can support the narrow occluded segment of the blood vessel or occlude the blood vessel dissection, and the effect of covering the covering on the main body part 10 is good, which ensures the safety of the operation. It should be noted that the range of the included angle a is 30° to 120°, which means that the size of the included angle a can be 30°, or a value between 30° and 120°, or 120°.

[0074] The design of the included angle a ranging from 30° to 120° ensures that the main body part 10 of the stent body 1000 in the expanded state has a larger radial dimension, has a good effect on supporting the narrow occluded segment of the blood vessel or occluding the blood vessel dissection, and has a good treatment effect on the blood vessel disease. On the other hand, the first wave unit 110 of the stent body 1000 in the expanded state has a better flexibility, the main body part 10 has a better flexibility, and the main body part 10 can adapt to various deformations of the blood vessel, such as bending and branching, thereby ensuring the effect of the stent body 1000 on the blood vessel disease intervention treatment. In addition, such a design is also beneficial to covering the covering on the main body part 10 of the stent body 1000 in the expanded state, and the effect of the covering is good, which ensures the safety of the operation.

[0075] Specifically, when the included angle a is less than 30°, the structure of the first wave unit 110 is relatively compact, so that the structure of the main body part 10 of the stent body 1000 in the expanded state is relatively compact. At this time, the radial dimension of the main body part 10 is small. The main body part 10 not only cannot support the narrow occluded segment of the blood vessel or occlude the blood vessel dissection, but also has poor flexibility, and the main body part 10 cannot adapt to various deformations of the blood vessel, such as bending, so that the treatment effect of the stent body 1000 is poor. In addition, it is also not conducive to covering the covering on the main body part 10, and the effect of the covering is poor. During the operation, the covering is easy to separate from the main body part 10, causing a medical accident, and the safety of the operation cannot be guaranteed.

[0076] When the included angle a is greater than 120°, the structure of the first wave unit 110 is relatively loose, so that the structure of the main body part 10 of the stent body 1000 in the expanded state is relatively loose. At this time, the radial dimension of the main body part 10 is easy to be too large, which causes the stent body 1000 to be difficult to be implanted into the blood vessel. Moreover, during the process of implanting the stent graft into the blood vessel, the first wave unit 110 will be deformed with the stent body 1000 being compressed, and during the operation, the angle of the included angle a of the first wave unit 110 changes greatly, which easily damages the covering located at the first outer arc segment 113a of the first high wave 111 and the first outer arc segment 113b of the first low wave 112, and affects the treatment effect of the operation.

[0077] It can be understood that, on the basis of ensuring that the stent body 1000 in the expanded state can support the blood vessel or occlude the blood vessel, the included angle a should be selected to be a smaller value between 30° and 120°, so as to avoid that the radial size of the stent body 1000 in the expanded state is too large to be implanted into the blood vessel.

[0078] In the illustrated embodiment, the included angle a between the tangent of the two first wave rods 115 of the first high wave 111 and the first low wave 112 is 60° when the stent body 1000 is in the expanded state. When the stent body 1000 in the unexpanded state (as shown in Figure 1 is expanded radially, it is convenient for processing and is beneficial to reduce the processing cost. In other embodiments, the included angle a between the tangent of the two first wave rods 115 of the first high wave 111 and the first low wave 112 can also be different, and the included angle a can be any value in the range of 30° to 120°, and the present application does not limit this.

[0079] Please refer to Figure 3 to Figure 4 In some embodiments, in the same first high wave 111, the distance A1 by which the center of the first outer circular arc segment 113a is offset to the first outer circular arc segment 113a relative to the center of the first inner circular arc segment 114a is less than or equal to 2 / 3 of the radial width of the first wave rod 115, when the two long edges of the first wave rod 115 are parallel, the radial width is the distance between the two long edges, and when the two long edges of the first wave rod 115 are not parallel, the minimum distance between the two long edges can be taken as the radial width; and / or in the same first low wave 112, the distance A2 by which the center of the first outer circular arc segment 113b is offset to the first outer circular arc segment 113b relative to the center of the first inner circular arc segment 114b is less than or equal to 2 / 3 of the outer diameter of the first wave rod 115. When the stent body 1000 (as shown in Figure 1 is expanded radially, such a design is beneficial to reduce the maximum stress of the first high wave 111 and / or the first low wave 112, thereby reducing the maximum stress of the corresponding first wave-shaped unit 110 in the expansion process, reducing the maximum stress of the first wave-shaped connecting ring 11 when expanded radially, and further reducing the stress deformation amount of each part of the main body part 10 in the expansion process, thereby ensuring the uniformity of the stent body 1000 after expansion.

[0080] It should be noted that, in the stent body 1000 in the unexpanded state (as shown in Figure 1In the process of being radially expanded to the expanded state, the radial width of the first high wave 111 and the first wave rod 115 of the first low wave 112 of each first wave unit 110 does not change; in the same first high wave 111, the distance A1 between the center of the first outer circular arc segment 113a and the center of the first inner circular arc segment 114a offset to the first outer circular arc segment 113a does not change; in the same first low wave 112, the distance A2 between the center of the first outer circular arc segment 113b and the center of the first inner circular arc segment 114b offset to the first outer circular arc segment 113b does not change.

[0081] In the illustrated embodiment, in each first wave unit 110, the radial width of the two first wave rods 115 (i.e., the first wave rod 115a and the first wave rod 115b) of the first high wave 111 and the two first wave rods 115 (i.e., the first wave rod 115c and the first wave rod 115d) of the first low wave 112 are equal. In this way, it is convenient for processing, which is conducive to reducing the processing cost and conducive to the uniform stress distribution of the first wave unit 110. Specifically, the radial width of each first wave rod 115 is 0.12 mm. In other embodiments, the radial width of each first wave rod 115 can also be other positive numbers greater than zero, such as 0.14 mm, 0.15 mm, 0.16 mm, etc. The radial width of the two first wave rods 115 (i.e., the first wave rod 115a and the first wave rod 115b) of the first high wave 111 and the two first wave rods 115 (i.e., the first wave rod 115c and the first wave rod 115d) of the first low wave 112 can also be unequal, which is not limited by the present application.

[0082] Therefore, in the illustrated embodiment, in the same first high wave 111, the distance A1 between the center of the first outer circular arc segment 113a and the center of the first inner circular arc segment 114a offset to the first outer circular arc segment 113a is less than or equal to 0.08 mm. In the same first low wave 112, the distance A2 between the center of the first outer circular arc segment 113b and the center of the first inner circular arc segment 114b offset to the first outer circular arc segment 113b is less than or equal to 0.08 mm.

[0083] Preferably, the distance A1 between the center of the first outer circular arc segment 113a and the center of the first inner circular arc segment 114a offset to the first outer circular arc segment 113a is equal to the distance A2 between the center of the first outer circular arc segment 113b and the center of the first inner circular arc segment 114b offset to the first outer circular arc segment 113b. In this way, not only is it convenient for processing, which is conducive to reducing the processing cost, but also it is conducive to the uniform expansion of the first wave unit 110, further ensuring the uniformity of the stent body 1000 after expansion.

[0084] Further, the distance A1 from the center of the first outer arc segment 113a to the center of the first inner arc segment 114a and the distance A2 from the center of the first outer arc segment 113b to the center of the first inner arc segment 114b are both 0.04 mm. That is, the offset (A1 or A2) of the first wave unit 110 is 0.04 mm.

[0085] Since the offset of the first wave unit 110 is negatively correlated with the maximum stress of the first wave unit 110 in the expansion process, when the stent body 1000 is expanded from the unexpanded state (the radial dimension is 2 mm) to the expanded state (the radial dimension is 8 mm), the design of A1 and A2 being 0.04 mm can effectively reduce the maximum stress of the corresponding first wave unit 110 in the expansion process, thereby reducing the stress deformation of each part of the main body 10 of the stent body 1000 in the expansion process, further ensuring the uniformity of the stent body 1000 after expansion. Moreover, compared with the scheme of the offset being 0.04 mm to 0.08 mm (not including 0.04 mm), the scheme of the offset being 0.04 mm not only has low processing cost and high processing benefit, but also is conducive to the miniaturization design of the first wave unit 110, and further conducive to the miniaturization design of the stent body 1000.

[0086] Please refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, in the same first wave connection ring 11, the distance between the common tangent at the wave peak of the first high wave 111 of the plurality of first wave units 110 and the common tangent at the wave valley of the first low wave 112 of the plurality of first wave units 110 in the axial direction is the first amplitude height.

[0087] In the present application, in the first wave unit 110, the "wave peak" refers to the first arc portion 116a of the first high wave 111, and the common tangent at the wave peak of the first high wave 111 of the plurality of first wave units 110 refers to a straight line tangent to the first outer arc segment 113a of the first high wave 111 of the plurality of first wave units 110. In the first wave unit 110, the "wave valley" refers to the first arc portion 116b of the first low wave 112, and the common tangent at the wave valley of the first low wave 112 of the plurality of first wave units 110 refers to a straight line tangent to the first outer arc segment 113b of the first low wave 112 of the plurality of first wave units 110. The same understanding applies to "the wave peak of the first high wave 111 of the first wave unit 110" and "the wave valley of the first low wave 112 of the first wave unit 110" hereinafter, and will not be repeated.

[0088] It should be noted that, since the stent body 1000 is expanded radially, the first wave-shaped connecting ring 11 is expanded radially, and each first wave unit 110 of the first wave-shaped connecting ring 11 is unfolded along with the expansion of the first wave-shaped connecting ring 11. When the stent body 1000 is expanded radially, the first amplitude height of the stent body 1000 will decrease accordingly. That is, the first amplitude height C1 of the stent body 1000 in the expanded state is less than the first amplitude height C2 of the stent body 1000 in the unexpanded state. It can be understood that the greater the radial size of the stent body 1000 in the expanded state, the smaller the first amplitude height C1 of the stent body 1000.

[0089] In the illustrated embodiment, the first amplitude height C2 of each first wave-shaped connecting ring 11 is equal. When the stent body 1000 is expanded radially, such a design ensures that the first amplitude height C1 of each first wave-shaped connecting ring 11 after expansion is equal, further ensuring the uniformity of the stent body 1000 after expansion.

[0090] Further, when the stent body 1000 is in the expanded state, the first amplitude height C1 ranges from 1.3 mm to 1.7 mm. In this way, when the stent body 1000 (as shown in FIG. 1B) is expanded radially, the first wave-shaped connecting ring 11 can achieve a relatively uniform stress effect, ensuring the uniformity of the first wave-shaped connecting ring 11, and further ensuring the uniformity of the stent body 1000 after expansion. Figure 1

[0091] Preferably, when the stent body 1000 is in the expanded state, the first amplitude height C1 is 1.4 mm. Since the first amplitude height C1 of the first wave-shaped connecting ring 11 is positively correlated with the maximum stress of the first wave unit 110 of the first wave-shaped connecting ring 11 during unfolding, the design of the first amplitude height C1 being 1.4 mm, on the basis of being able to expand the stent body 1000 from the unexpanded state (radial size of 2 mm) to the expanded state (radial size of 8 mm), can greatly reduce the maximum stress of the first wave unit 110 during unfolding, further reduce the stress deformation amount of the corresponding first wave-shaped connecting ring 11 during expansion, and further ensure the uniformity of the stent body 1000 after expansion.

[0092] Next, please refer to FIG. 1C, the following demonstrates the above content by performing tensile simulation on the seven first wave units 110 of the first wave-shaped connecting ring 11 of the stent body 1000 provided in the embodiment shown in FIG. 1B. Figure 1 to Figure 7 Figure 1 to Figure 4 Specifically, as shown in FIG. 1C, the seven first wave units 110 of the first wave-shaped connecting ring 11 of the stent body 1000 are divided into three groups, and the first wave unit 110 in each group is connected by a connecting line.

[0093] Specifically, as shown in FIG. 1C, the seven first wave units 110 of the first wave-shaped connecting ring 11 of the stent body 1000 are divided into three groups, and the first wave unit 110 in each group is connected by a connecting line. Figure 5 ​​As shown, seven first wave units 110 in the same first wave connecting ring 11 are circumferentially adjacent when the stent body 1000 in the embodiment shown in the figure is in the unexpanded state. One end of the seven first wave units 110 is fixed, and the other end is stretched along the axial direction of the seven first wave units 110 by the pulling force F until the included angle a (as shown in Figure 4 FIG. 6) of the seven first wave units 110 after stretching is 60°. Among them, when the size of the pulling force F is 40 N (Newton), the seven first wave units 110 can be stretched along the axial direction by the pulling force F until the included angle a of the seven first wave units 110 after stretching is 60°. Hereinafter, the stretching simulation is taken as an example with the size of the pulling force F being 40 N.

[0094] It should be noted that, in the embodiment shown in Figure 1 to Figure 4 When the stent body 1000 is expanded from the unexpanded state (radial size of 2 mm) to the expanded state (radial size of 8 mm) along the radial direction, the circumference of the stent body 1000 changes from 6.28 mm to 25.13 mm. Since the number of first wave units 110 in most of the first wave connecting rings 11 is eighteen, when the stent body 1000 is expanded along the radial direction, the seven first wave units 110 in most of the first wave connecting rings 11 will expand with the expansion of the corresponding first wave connecting ring 11, and at this time, the circumferential size of the seven first wave units 110 is about 10 mm. Therefore, in the stretching simulation, when the seven first wave units 110 are stretched along the axial direction by the pulling force F of 40 N, so that the included angle a of the seven first wave units 110 after stretching is 60°, the length L of the seven first wave units 110 along the axial direction is greater than 10 mm. The scheme can meet the requirement that the stent body 1000 is expanded from the unexpanded state (radial size of 2 mm) to the expanded state (radial size of 8 mm) along the radial direction.

[0095] On the basis of ensuring that the first amplitude height C1 of the seven first wave units 110 after expansion and the radial width of the first wave rod 115 of each first wave unit 110 remain unchanged, by synchronously changing the offset amount (A1 or A2) of the seven first wave units 110 for multiple times of stretching simulation, the relationship diagram (i.e. Figure 6 ) between the offset amount (A1 or A2) of the first wave unit 110 of the stent body 1000 and the maximum stress suffered by the first wave unit 110 in the expansion process can be obtained. The offset amount refers to the distance that the center of the first outer circular arc segment 113 is offset relative to the center of the first inner circular arc segment 114 towards the first outer circular arc segment 113 in the above embodiment.

[0096] It should be noted that in the above multiple stretching simulations, the first amplitude height C1 is always 1.4 mm; the radial width of the first wave rod 115 of each first wave unit 110 is always 0.12 mm, that is, the change range of the offset amount (A1 or A2) of the first wave unit 110 is 0 to 0.08 mm; when changing the offset amount of the first wave unit 110, A1 and A2 change synchronously, that is, A1 and A2 are always equal in the above multiple stretching simulations.

[0097] As shown in Figure 6 The center of the first outer arc segment 113 of the first high wave 111 and / or the first low wave 112 of the first wave unit 110 is offset relative to the center of the first inner arc segment 114 to the first outer arc segment 113, which can reduce the maximum stress on the corresponding first wave unit 110 during the unfolding process, reduce the stress deformation amount of the corresponding first wave-shaped connecting ring 11 during the expansion process, and further reduce the stress deformation amount of each part of the stent body 1000 during the expansion process, thereby ensuring that each part of the stent body 1000 can be evenly expanded during the expansion process, and ensuring the uniformity of the stent body 1000 after expansion.

[0098] Moreover, the offset amount of the first wave unit 110 is negatively correlated with the maximum stress on the first wave unit 110 during the unfolding process. The greater the offset amount of the first wave unit 110, the smaller the maximum stress on the first wave unit 110 during the unfolding process, and the smaller the stress deformation amount of each first wave unit 110, which is further conducive to improving the uniformity of the stent body 1000 after expansion.

[0099] It should be noted that in the stretching simulations of the 9 schemes with offset amounts of 0 to 0.08 mm, when the included angle α of the seven first wave units 110 after stretching is 60°, the length L of the seven first wave units 110 along the axial direction is greater than 10 mm, that is, the above 9 schemes all achieve the requirement that the stent body 1000 is converted from the unexpanded state (radial size of 2 mm) to the expanded state (radial size of 8 mm) along the radial direction.

[0100] Therefore, when the offset of the first wave-shaped unit 110 is 0.04 mm, i.e., A1 and A2 are both 0.04 mm, on the one hand, compared with the scheme in which the offset is 0 to 0.04 mm (excluding 0.04 mm), the maximum stress borne by the first wave-shaped unit 110 in the unfolding process can be effectively reduced on the premise that the stent body 1000 can be expanded to meet the expected target, further ensuring the uniformity of the stent body 1000 after expansion. On the other hand, compared with the scheme in which the offset is 0.04 mm (excluding 0.04 mm) to 0.08 mm, the maximum stress borne by the first wave-shaped unit 110 in the unfolding process is not greatly reduced, i.e., the uniformity of the stent body 1000 after expansion is not greatly improved, and the processing cost is low. Therefore, the scheme in which the offset is 0.04 mm can effectively reduce the processing cost on the premise of ensuring the uniformity of the stent body 1000 after expansion, and the processing benefit is high. In addition, it is also beneficial to the miniaturization design of the first wave-shaped unit 110, and further beneficial to the miniaturization design of the stent body 1000.

[0101] On the premise that the offset (A1 or A2) of the seven first wave-shaped units 110 and the radial width of the first wave rod 115 of each first wave-shaped unit 110 remain unchanged, by synchronously changing the first amplitude height C1 of the stent body 1000 after expansion of the seven first wave-shaped units 110 to perform multiple stretching simulations, a relationship diagram between the first amplitude height C1 of the first wave-shaped connecting ring 11 of the stent body 1000 in the expanded state and the maximum stress borne by one first wave-shaped unit 110 of the first wave-shaped connecting ring 11 in the unfolding process can be obtained (i.e., Figure 7 ).

[0102] It should be noted that in the above multiple stretching simulations, A1 and A2 of each first wave-shaped unit 110 are both 0.04 mm, i.e., the offset of the seven first wave-shaped units 110 is always 0.04 mm; the radial width of the first wave rod 115 of each first wave-shaped unit 110 is always 0.12 mm; and the change range of the first amplitude height C1 is 1.3 mm to 1.7 mm.

[0103] As shown in Figure 7 , the first amplitude height C1 of the first wave-shaped connecting ring 11 after expansion is positively correlated with the maximum stress borne by the first wave-shaped unit 110 of the first wave-shaped connecting ring 11 in the unfolding process. The smaller the first amplitude height C1 of the first wave-shaped connecting ring 11 after expansion, the smaller the maximum stress borne by the first wave-shaped unit 110 of the first wave-shaped connecting ring 11 in the unfolding process, and the more beneficial to improve the uniformity of the stent body 1000 after expansion.

[0104] It should be noted that in the stretching simulation of the first wave connecting ring 11 with the first amplitude height C1 of 1.3 mm, when the included angle a of the seven first wave units 110 after stretching is 60°, the length L of the seven first wave units 110 along the axial direction is less than 10 mm, that is, the scheme with the first amplitude height C1 of 1.3 mm cannot achieve the requirement that the stent body 1000 is converted from the unexpanded state (the radial size is 2 mm) to the expanded state (the radial size is 8 mm) along the radial direction.

[0105] In the stretching simulation of the four schemes of the first wave connecting ring 11 with the first amplitude height C1 of 1.4 mm to 1.7 mm, when the included angle a of the seven first wave units 110 after stretching is 60°, the length L of the seven first wave units 110 along the axial direction is greater than 10 mm, that is, the above four schemes all achieve the requirement that the stent body 1000 is converted from the unexpanded state (the radial size is 2 mm) to the expanded state (the radial size is 8 mm) along the radial direction.

[0106] Therefore, when the first amplitude height C1 is 1.4 mm, on the basis of being able to achieve the conversion of the stent body 1000 from the unexpanded state (the radial size is 2 mm) to the expanded state (the radial size is 8 mm) along the radial direction, the maximum stress that the first wave unit 110 suffers during the expansion process can be greatly reduced, the stress deformation amount during the expansion process of the corresponding first wave connecting ring 11 is greatly reduced, and the uniformity of the stent body 1000 after expansion is further ensured.

[0107] Please refer to Figure 1 , Figure 2 , Figure 9 , Figure 12 , Figure 17 and Figure 28 In some embodiments, the first wave connecting ring 11 is a circumferentially open ring structure, and a plurality of first wave connecting rings 11 are arranged in a continuous spiral to form a tubular structure. In this way, the tubular structure formed by the plurality of first wave connecting rings 11 arranged in a spiral has good flexibility, so that the stent body 1000 has good flexibility, which can adapt to various deformations of the blood vessel, such as bending and branching, and is beneficial to improve the treatment effect of the stent body 1000 on the blood vessel disease. The "circumferentially open ring structure" can be understood as a position one turn around the circumference of the stent body 1000 and along the extension direction of the first wave connecting ring 11 without being connected to an arbitrary point on the first wave connecting ring 11 as a starting point, and preferably, the position is spaced from the starting point position on the axis of the stent body 1000. Correspondingly, the "circumferentially closed ring structure" can be understood as a position one turn around the circumference of the stent body 1000 and along the extension direction of the first wave connecting ring 11 connected to an arbitrary point on the first wave connecting ring 11 as a starting point.

[0108] Further, the first wave-shaped connecting rings 11 are integrally formed. In this way, the stress distribution of the first wave-shaped connecting rings 11 is uniform, which further ensures the uniformity of the stent body 1000 after expansion. In other embodiments, the first wave-shaped connecting rings 11 can also be connected stably by welding, gluing, or buckling, and the present application does not limit this.

[0109] As shown in the embodiments of Figure 2 and Figure 3 , any three first wave-shaped connecting rings 11 arranged in sequence along the axis from the proximal end to the distal end are respectively a first upper wave-shaped connecting ring 11a, a first middle wave-shaped connecting ring 11b, and a first lower wave-shaped connecting ring 11c. The first wave rod 115c of the first wave unit 110 at one end of the first middle wave-shaped connecting ring 11b is connected to the first wave rod 115b of the first wave unit 110 at one end of the first upper wave-shaped connecting ring 11a, and the first wave rod 115b of the first wave unit 110 at the other end of the first middle wave-shaped connecting ring 11b is connected to the first wave rod 115c of the first wave unit 110 at one end of the first lower wave-shaped connecting ring 11c. In this way, the first upper wave-shaped connecting ring 11a, the first middle wave-shaped connecting ring 11b, and the first lower wave-shaped connecting ring 11c arranged in sequence along the axis can be connected end to end to form a whole, and the structure is stable.

[0110] Please refer to Figure 1 , Figure 2 , Figure 9 , Figure 12 , Figure 17 and Figure 28 , in some embodiments, the main body part 10 further comprises a first connecting rod 12, and every two first wave units 110 axially adjacent are connected by the first connecting rod 12. The first connecting rod 12 has a plurality of first connecting rods 12, and the plurality of first connecting rods 12 are arranged in a circumferential interval. In this way, on the one hand, the axial strength of the main body part 10 is greatly enhanced by the first connecting rod 12, the structural stability of the main body part 10 is improved, and the structural stability of the stent body 1000 is improved; on the other hand, since the plurality of first connecting rods 12 are arranged at intervals, the number of first connecting rods 12 can be effectively reduced on the basis of ensuring the good structural stability of the main body part 10, the flexibility of the main body part 10 is improved, and the flexibility of the stent body 1000 is improved.

[0111] It should be noted that the two first wave units 110 axially adjacent to each other can be one first wave unit 110 in one first wave connecting ring 11 and another first wave unit 110 in another first wave connecting ring 11 axially adjacent to the first wave unit 110. Wherein, one first wave connecting ring 11 can be a first wave connecting ring 11 with any point on the first wave connecting ring 11 as a starting point, and the position of the first wave connecting ring 11 around the circumference of the stent body 1000 and along the extension direction of the first wave connecting ring 11 for one turn. The continuous wave connecting ring 11 between the above-mentioned starting point and the position is a first wave connecting ring 11. Wherein, the two first wave units 110 axially adjacent to each other connected by the first connecting rod 12 can be relative to the central axis direction of the main body part 10, or can be staggered in the circumferential direction of the main body part 10.

[0112] For example, as shown in the embodiment, Figure 2 The plurality of first connecting rods 12 can include a plurality of first connecting rods 12a. The plurality of first connecting rods 12a includes a plurality of first connecting rods 12aa and a plurality of first connecting rods 12ab. The first connecting rod 12aa is connected between the two first wave units 110 axially adjacent to each other in one first wave connecting ring 11. For example, the first connecting rod 12aa shown in the figure is connected between the two first wave units 110 axially adjacent to each other in the first middle wave connecting ring 11b. At this time, the two first wave units 110 axially adjacent to each other in one first wave connecting ring 11 are connected by the first connecting rod 12aa. The design of the first connecting rod 12aa greatly enhances the axial strength of the corresponding first wave connecting ring 11, thereby improving the structural stability of the main body part 10 and the structural stability of the stent body 1000.

[0113] The first connecting rod 12ab is connected between the first wave unit 110 of one first wave connecting ring 11 and the first wave unit 110 of another first wave connecting ring 11 axially adjacent to the first wave unit 110. For example, one of the first connecting rods 12ab shown in the figure is connected between one first wave unit 110 of the first middle wave connecting ring 11b and one first wave unit 110 of the first lower wave connecting ring 11c, and the two first wave units 110 are axially adjacent. At this time, the first connecting rod 12ab is connected between the two first wave connecting rings 11 axially adjacent to each other. Thus, the two first wave connecting rings 11 axially adjacent to each other are connected in the axial direction by the first connecting rod 12ab. In this way, the axial strength of the two first wave connecting rings 11 axially adjacent to each other is enhanced, thereby improving the structural stability of the main body part 10 and the structural stability of the stent body 1000. In other embodiments, the first connecting rod 12aa and / or the first connecting rod 12ab can be omitted.

[0114] Further, each first connecting rod 12 is integrally formed with two first wavy units 110 axially adjacent thereto. In this way, during the process of radially expanding the stent body 1000, the stress distribution of the two first wavy units 110 axially adjacent thereto is uniform, which is conducive to the uniform expansion of the main body 10, and further ensures the uniformity of the stent body 1000 after expansion.

[0115] Please refer to Figure 1 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 13 and Figure 28 In some embodiments, the first connecting rod 12 is a bent rod, and the first connecting rod 12 comprises a first connecting segment 121 and a first extending segment 122. The first connecting segment 121 is at least two, and in the two first wavy units 110 axially adjacent thereto, one of the first connecting segments 121 is connected to the trough (i.e. the first circular arc portion 116b) of one of the first wavy units 110, and the other first connecting segment 121 is connected to the crest (i.e. the first circular arc portion 116a) of the other first wavy unit 110. The first extending segment 122 is connected between the two first connecting segments 121, and is arc transitioned with the first connecting segments 121. The first extending segment 122 extends in the circumferential direction or extends obliquely to the circumferential direction.

[0116] Thus, each first connecting rod 12 can be connected with two first wavy units 110 axially adjacent thereto. In this way, the axial strength of the main body 10 is greatly enhanced, the structural stability of the main body 10 is improved, and further the structural stability of the stent body 1000 is improved. Moreover, when the stent body 1000 is radially expanded, since the first extending segment 122 is arc transitioned with the first connecting segment 121, the deformation of the first connecting rod 12 can be avoided from a large deviation (e.g. axial deviation), and further the uniform deformation of the first connecting rod 12 is ensured, the uniform stress of the two first wavy units 110 axially adjacent thereto is ensured, and the uniformity of the stent body 1000 after expansion is ensured.

[0117] Further, taking the center of the first connecting rod 12 as the symmetry origin O, the two first connecting segments 121 are symmetrical about the origin O. In this way, when the stent body 1000 is radially expanded, the stress distribution of the first connecting rod 12 is uniform, which is conducive to the uniform radial expansion of the stent body 1000, further ensures the uniformity of the stent body 1000 after expansion, and is beautiful and simple.

[0118] It should be noted that in the present application, any two first wave units 110 axially adjacent are respectively a first upper wave unit 110a and a first lower wave unit 110b, and the first upper wave unit 110a is located on the proximal side of the first lower wave unit 110b. The proximal end of each first connecting rod 12 is connected to the distal end of the first upper wave unit 110a axially adjacent thereto, and the distal end of each first connecting rod 12 is connected to the proximal end of the first lower wave unit 110b axially adjacent thereto.

[0119] In Figure 1 , Figure 2 and Figure 8 In the embodiment shown in the drawings, each first connecting rod 12a includes two first connecting segments 121 and a first extension segment 122a. Among them, the two first connecting segments 121 are respectively a first connecting segment 121a and a first connecting segment 121b. The first connecting segment 121a extends axially, one end of the first connecting segment 121a is connected to and arc transitions with the first circular arc part 116b of the first low wave 112 of the first upper wave unit 110a, and the other end is connected to and arc transitions with one end of the first extension segment 122a. The first extension segment 122a extends obliquely to the circumferential direction. The other end of the first extension segment 122a is connected to and arc transitions with one end of the first connecting segment 121b. The first connecting segment 121b extends axially. The other end of the first connecting segment 121b is connected to and arc transitions with the first circular arc part 116a of the first high wave 111 of the first lower wave unit 110b. The first connecting segment 121a and the first connecting segment 121b are symmetric about the center of the first extension segment 122a, that is, the center of the first extension segment 122a is the origin O of the first connecting rod 12a. Among them, the central angle of the arc part (not marked in the figure) between the first connecting segment 121a and the first extension segment 122a and the central angle of the arc part (not marked in the figure) between the first connecting segment 121b and the first extension segment 122a are equal and are a first radius R1.

[0120] In this way, the first upper wave unit 110a and the first lower wave unit 110b axially adjacent can be connected by the first connecting rod 12a, which enhances the axial strength of the main body 10, and further improves the structural stability of the main body 10 and the stent body 1000. Moreover, when the stent body 1000 is radially expanded, such design, on the one hand, since the first extension segment 122a and the first connecting segment 121a and the first connecting segment 121b are all arc transitions, it can avoid that the deformation of the first connecting rod 12a occurs a large axial deviation, and further ensure the uniform deformation of the first connecting rod 12a; on the other hand, since the first connecting segment 121a and the first connecting segment 121b are symmetric about the center (i.e. the origin O) of the first extension segment 122a, it can ensure that the stress distribution of the first connecting rod 12a is uniform, which is conducive to the uniform expansion of the stent body 1000 along the radial direction, further ensures the uniformity of the stent body 1000 after expansion, and is beautiful and simple.

[0121] Further, it is to be noted that when the stent body 1000 is radially expanded, the first connecting segment 121a and the first connecting segment 121b can still extend along the axial direction, and the extending direction does not change. In this way, since the stress of each first wave-shaped unit 110 is concentrated at the two first circular arc portions 116 when the stent body 1000 is radially expanded, the design that the two first connecting segments 121 corresponding to the two first wave-shaped units 110 axially adjacent to each other extend along the axial direction can avoid the two first connecting segments 121 from being axially inclined due to deformation, and further avoid the stress exerted by the first connecting segments 121 on the first circular arc portions 116 of the first wave-shaped units 110 from being directionally deviated, so as to benefit the uniform expansion of the first wave-shaped units 110 and further ensure the uniformity of the stent body 1000 after being expanded.

[0122] In other embodiments, the first extending segment 122a can also extend along the circumferential direction, and the first connecting segment 121a and the first connecting segment 121b can also extend along the axial direction. The number of the first connecting segments 121 can also be three, four or more, and the present application does not limit the number.

[0123] In the embodiments shown in Figure 1 , Figure 2 and Figure 8 , the first connecting segment 121a of the first connecting rod 12a is connected to the middle position of the first circular arc portion 116b, and the first connecting segment 121b of the first connecting rod 12a is connected to the middle position of the first circular arc portion 116a. In this way, the influence of the first connecting rod 12a on the stress distribution of the two first circular arc portions 116 can be avoided, which is beneficial to the uniform expansion of the two first wave-shaped units 110 axially adjacent to the first connecting rod 12a, and further ensures the uniformity of the stent body 1000 after being expanded.

[0124] In the embodiments shown in Figure 1 , Figure 2 , and Figure 8 , the first upper wave-shaped unit 110a and the first lower wave-shaped unit 110b are circumferentially spaced two first wave-shaped units 110 apart. Each first connecting rod 12 axially covers two first circular arc portions 116. In this way, on the basis of ensuring that the main body portion 10 has good structural stability, the number of the first connecting rods 12a is further reduced, and the flexibility of the stent body 1000 is improved. It is to be noted that “A axially covers B” means that the projection of A along the axial direction completely covers the projection of B along the axial direction. The description of “covers” hereinafter can be understood in the same way.

[0125] In other embodiments, each first connecting rod 12a can also only axially cover one (for example, as shown in Figure 10As shown), three (as shown) Figure 13 (As shown) or more first arc portions 116. The first connecting rod 12 can also be a straight rod (such as...) Figure 18 (As shown below), please refer to the following for details.

[0126] exist Figure 1 , Figure 2 and Figure 8 In the illustrated embodiment, the extension directions of the first connecting segment 121a and the first connecting segment 121b are both angled with the extension direction of the first extension segment 122a, and these angles are acute. Since both the first connecting segment 121a and the first connecting segment 121b extend axially, the first central angle β1 of the first connecting rod 12a can be designed to be relatively large, which makes the stress during deformation of the first connecting rod 12a more dispersed, which is beneficial to the uniform deformation of the first connecting rod 12a, thereby ensuring the uniformity of the support body 1000 after it is spread out.

[0127] It should be noted that, since both the first connecting segment 121a and the first connecting segment 121b extend axially, the smaller the angle between the extension directions of the first connecting segment 121a and the first connecting segment 121b and the extension direction of the first extension segment 122a, the larger the first central angle β1 will be. Thus, when the support body 1000 is radially expanded, the stress during the deformation of the first connecting rod 12a will be more dispersed, which is more conducive to the uniform deformation of the first connecting rod 12a, thereby improving the uniformity of the support body 1000 after expansion.

[0128] In other embodiments, the angle between the extension direction of the first connecting segment 121a and the extension directions of the first connecting segment 121b and the first extension segment 122a may also be an obtuse angle (e.g., Figure 10 (as shown) or at a right angle; or, the extension direction of the first connecting segment 121a may be parallel to the extension direction of the first connecting segment 121b and the extension direction of the first extension segment 122a.

[0129] exist Figure 9 and Figure 10In the shown embodiment, the first connecting rod 12 is in a plurality, and the plurality of first connecting rods 12 includes a plurality of first connecting rods 12a, each of which includes two first connecting segments 121 and a first extension segment 122a. Among them, the two first connecting segments 121 are respectively a first connecting segment 121a and a first connecting segment 121b. The first connecting segment 121a extends in the axial direction, one end of the first connecting segment 121a is connected with and arc-transited with the first circular arc part 116b of the first low wave 112 of the first upper wave-shaped unit 110a, and the other end is connected with and arc-transited with one end of the first extension segment 122a. The first extension segment 122a extends obliquely to the circumferential direction. The other end of the first extension segment 122a is connected with and arc-transited with one end of the first connecting segment 121b. The first connecting segment 121b extends in the axial direction. The other end of the first connecting segment 121b is connected with and arc-transited with the first circular arc part 116a of the first high wave 111 of the first lower wave-shaped unit 110b. The first connecting segment 121a and the first connecting segment 121b are symmetric to the center of the first extension segment 122a, that is, the center of the first extension segment 122a is the origin O of the first connecting rod 12a. Among them, the central angle of the arc part (not marked in the figure) between the first connecting segment 121a and the first extension segment 122a and the central angle of the arc part (not marked in the figure) between the first connecting segment 121b and the first extension segment 122a are equal and are a second central angle β2.

[0130] The first connecting segment 121a of the first connecting rod 12a is connected to the middle position of the first circular arc part 116b; the first connecting segment 121b of the first connecting rod 12a is connected to the middle position of the first circular arc part 116a. In this way, the influence of the first connecting rod 12a on the stress distribution of the two first circular arc parts 116 can be avoided, which is beneficial to the uniform expansion of the two first wave-shaped units 110 adjacent to the first connecting rod 12a in the axial direction, and further ensures the uniformity of the stent body 1000 after expansion.

[0131] The first connecting segment 121a and the first connecting segment 121b of the first connecting rod 12a are spaced apart by one first circular arc part 116 in the circumferential direction. It can be understood that the first connecting rod 12a blocks one first circular arc part 116 in the axial direction. In this way, on the basis of ensuring that the main body part 10 has good structural stability, the number of first connecting rods 12a is reduced, and the flexibility of the stent body 1000 is improved.

[0132] The first connection segment 121a has an angle with the extension direction of the first connection segment 121b and the extension direction of the first extension segment 122a, and the angle is an obtuse angle, that is, the angle between the extension direction of the first connection segment 121a and the extension direction of the first extension segment 122a is an obtuse angle. Since the two first connection segments 121 extend in the axial direction, the axial length of the two first connection segments 121a of the first connecting rod 12a can be designed to be small, and the maximum size of the first connecting rod 12a in the axial direction can be designed to be small, which is beneficial to shorten the axial spacing of the first upper wave-shaped unit 110a and the first lower wave-shaped unit 110b, and is beneficial to the compactness of the main body 10 structure, and is further beneficial to the miniaturization design of the support body 1000.

[0133] Compared with the first connecting rod 12a of the embodiment shown in Figure 1 , Figure 2 and Figure 8 , the axial length of the two first connection segments 121 of the first connecting rod 12a of the embodiment shown in Figure 9 and Figure 10 is designed to be smaller, and the maximum size of the first connecting rod 12a in the axial direction is smaller, which is more beneficial to the compactness of the main body 10 structure, and is beneficial to the miniaturization design of the support body 1000. In addition, since the angle between the extension direction of the first connection segment 121a and the extension direction of the first connection segment 121b and the extension direction of the first extension segment 122a is larger, the second central angle β2 will be smaller than the first central angle β1 (as shown in Figure 8 ).

[0134] In Figure 12 and Figure 13In the shown embodiment, the first connecting rod 12 is in a plurality, and the plurality of first connecting rods 12 includes a plurality of first connecting rods 12a, each of which includes four first connecting segments 121 and a first extension segment 122a, and the four first connecting segments 121 are respectively a first connecting segment 121a, a first connecting segment 121b, a first connecting segment 121c, and a first connecting segment 121d. The first connecting segment 121a, the first connecting segment 121b, the first connecting segment 121c, and the first connecting segment 121d are sequentially arranged in the axial direction from the proximal end to the distal end. The first connecting segment 121a extends in the axial direction. One end of the first connecting segment 121a is connected to and arc-transited with the first circular arc portion 116b of the first low wave 112 of the first upper wave-shaped unit 110a, and the other end is connected to and arc-transited with one end of the first connecting segment 121c. The first connecting segment 121c extends obliquely to the circumferential direction. The other end of the first connecting segment 121c is connected to and arc-transited with one end of the first extension segment 122a. The first extension segment 122a extends obliquely to the circumferential direction, and the other end of the first extension segment 122a is connected to and arc-transited with one end of the first connecting segment 121d. The first connecting segment 121d extends obliquely to the circumferential direction, and the other end of the first connecting segment 121d is connected to and arc-transited with one end of the first connecting segment 121b. The first connecting segment 121b extends in the axial direction, and the other end of the first connecting segment 121b is connected to and arc-transited with the first circular arc portion 116a of the first high wave 111 of the first lower wave-shaped unit 110b. The first connecting segment 121a and the first connecting segment 121b are symmetric to the center of the first extension segment 122a. The first connecting segment 121c and the first connecting segment 121d are symmetric to the center of the first extension segment 122a, that is, the center of the first extension segment 122a is the origin O of the first connecting rod 12a.

[0135] In the shown embodiment, the first connecting rod 12 is in a plurality, and the plurality of first connecting rods 12 includes a plurality of first connecting rods 12a, each of which includes four first connecting segments 121 and a first extension segment 122a, and the four first connecting segments 121 are respectively a first connecting segment 121a, a first connecting segment 121b, a first connecting segment 121c, and a first connecting segment 121d. The first connecting segment 121a, the first connecting segment 121b, the first connecting segment 121c, and the first connecting segment 121d are sequentially arranged in the axial direction from the proximal end to the distal end. The first connecting segment 121a extends in the axial direction. One end of the first connecting segment 121a is connected to and arc-transited with the first circular arc portion 116b of the first low wave 112 of the first upper wave-shaped unit 110a, and the other end is connected to and arc-transited with one end of the first connecting segment 121c. The first connecting segment 121c extends obliquely to the circumferential direction. The other end of the first connecting segment 121c is connected to and arc-transited with one end of the first extension segment 122a. The first extension segment 122a extends obliquely to the circumferential direction, and the other end of the first extension segment 122a is connected to and arc-transited with one end of the first connecting segment 121d. The first connecting segment 121d extends obliquely to the circumferential direction, and the other end of the first connecting segment 121d is connected to and arc-transited with one end of the first connecting segment 121b. The first connecting segment 121b extends in the axial direction, and the other end of the first connecting segment 121b is connected to and arc-transited with the first circular arc portion 116a of the first high wave 111 of the first lower wave-shaped unit 110b. The first connecting segment 121a and the first connecting segment 121b are symmetric to the center of the first extension segment 122a. The first connecting segment 121c and the first connecting segment 121d are symmetric to the center of the first extension segment 122a, that is, the center of the first extension segment 122a is the origin O of the first connecting rod 12a.

[0136] The first connecting segment 121a of the first connecting rod 12a is connected to the middle position of the first circular arc portion 116b, and the first connecting segment 121b of the first connecting rod 12a is connected to the middle position of the first circular arc portion 116a. In this way, the stress distribution of the first connecting rod 12a on the two first circular arc portions 116 can be avoided, which is beneficial to the uniform expansion of the two first wave units 110 axially adjacent to the first connecting rod 12a, and further ensures the uniformity of the stent body 1000 after expansion.

[0137] The first connecting segment 121a and the first connecting segment 121b of the first connecting rod 12a are circumferentially spaced by one first circular arc portion 116. The first connecting rod 12a axially blocks three first circular arc portions 116. In this way, on the basis of ensuring that the main body portion 10 has good structural stability, the number of the first connecting rod 12a is reduced, and the flexibility of the stent body 1000 is improved.

[0138] Compared with the first connecting rod 12a of the embodiments shown in Figure 1 , Figure 2 and Figure 8 , Figure 12 and Figure 13 the number of the arc portions of the first connecting rod 12a of the embodiments shown in Figure 8 is larger, and the third central angle β3 is larger than the first central angle β1 (as shown in Figure 12 ). Figure 13 When the first connecting rod 12a of the embodiments shown in deforms, the stress will be more dispersed, the deformation of the first connecting rod 12a will be more uniform, and the uniformity of the stent body 1000 after being expanded in the radial direction will be higher.

[0139] Figure 28 It should be noted that the first connecting rod 12a of the embodiment shown in Figure 1 has the same structure as the first connecting rod 12a of the embodiments shown in Figure 2 , Figure 8 , and thus will not be described again.

[0140] Please refer to Figure 17 and Figure 18 , in some embodiments, the first connecting rod 12 is a straight rod. The structure is simple, easy to process, and the processing cost is low.

[0141] In the illustrated embodiment, the first connecting rods 12 are in a plurality, and the plurality of first connecting rods 12 includes a plurality of first connecting rods 12a. One end of the first connecting rod 12a is connected to and arcuately transitions with the first circular arc portion 116b of the first low wave 112 of the first upper wave-shaped cell 110a, and the other end is connected to and arcuately transitions with the first circular arc portion 116a of the first high wave 111 of the first lower wave-shaped cell 110b extending obliquely to the axial direction. In this way, the first upper wave-shaped cell 110a and the first lower wave-shaped cell 110b axially adjacent to each other can be axially connected by the first connecting rod 12a, greatly enhancing the axial strength of the main body portion 10, and further improving the structural stability of the main body portion 10 and the stent body 1000. Moreover, the structure is simple, easy to process, and low in processing cost. In other embodiments, the first connecting rod 12a can also extend along the axial direction, and the present application does not limit this.

[0142] In addition, in the illustrated embodiment, the first upper wave-shaped cell 110a and the first lower wave-shaped cell 110b of the first connecting rod 12a are circumferentially adjacent to each other. Each first connecting rod 12a does not axially shield the first circular arc portion 116. In other embodiments, the first upper wave-shaped cell 110a and the first lower wave-shaped cell 110b of the first connecting rod 12a can also be circumferentially spaced, i.e., the first connecting rod 12a can also axially shield the first circular arc portion 116.

[0143] Please refer to Figure 15 and Figure 20 In some embodiments, the first wave-shaped connecting ring 11 is a circumferentially closed loop structure, the main body portion 10 includes the first connecting rod 12, and every two first wave-shaped connecting rings 11 axially adjacent to each other are connected by the first connecting rod 12. In this way, every two first wave-shaped connecting rings 11 axially adjacent to each other are fixedly connected by the first connecting rod 12 to form an entirety, ensuring the structural stability of the stent body 1000. Moreover, the first wave-shaped connecting ring 11 in the circumferentially closed loop structure has good radial support force, which is conducive to improving the radial support strength of the stent body 1000 and improving the supportability of the stent body 1000 to the blood vessel.

[0144] Further, every two first wave-shaped connecting rings 11 axially adjacent to each other are connected by a plurality of first connecting rods 12, and the plurality of first connecting rods 12 are arranged circumferentially at intervals. In this way, the fixed connection of the two first wave-shaped connecting rings 11 axially adjacent to each other is realized by the plurality of first connecting rods 12, further improving the structural stability of the stent body 1000. Moreover, the plurality of first connecting rods 12 arranged circumferentially at intervals is conducive to reducing the number of first connecting rods 12 on the basis of ensuring the structural stability of the stent body 1000, and further improving the flexibility of the stent body 1000.

[0145] Please refer to Figure 15 and Figure 16In some embodiments, the first connecting rod 12 is a bent rod, and the first connecting rod 12 comprises a first connecting segment 121 and a first extending segment 122. The number of the first connecting segments 121 is two, and one of the first connecting segments 121 is connected to the trough (i.e., the first circular arc portion 116b) of one of the first wavy units 110, and the other of the first connecting segments 121 is connected to the crest (i.e., the first circular arc portion 116a) of the other of the first wavy units 110. The first extending segment 122 is connected between the two first connecting segments 121 and is arc transitioned with the first connecting segments 121. The first extending segment 122 extends in the circumferential direction or extends obliquely to the circumferential direction.

[0146] In this way, each of the two first wavy connecting rings 11 axially adjacent to each other is fixedly connected by the first connecting rod 12 to form a whole, so as to ensure the structural stability of the stent body 1000. Moreover, when the stent body 1000 is radially expanded, the first extending segment 122 is arc transitioned with the first connecting segments 121, so as to avoid the deformation of the first connecting rod 12 from being greatly deviated (e.g., axially deviated), and thus to ensure the uniform deformation of the first connecting rod 12, the uniform stress of the two first wavy units 110 axially adjacent to each other, and the uniformity of the stent body 1000 after being expanded.

[0147] Further, the two first connecting segments 121 are symmetric about the origin O. In this way, when the stent body 1000 is radially expanded, the stress of the first connecting rod 12 is uniformly distributed, which is conducive to the uniform radial expansion of the stent body 1000, further ensures the uniformity of the stent body 1000 after being expanded, and is also beautiful and simple.

[0148] In the illustrated embodiment, the first connecting rods 12 are in a plurality, and the plurality of first connecting rods 12 includes a plurality of first connecting rods 12a, each of which includes two first connecting segments 121 and one first extending segment 122. The two first connecting segments 121 are respectively a first connecting segment 121a and a first connecting segment 121b. The first connecting segment 121a extends obliquely to the axial direction, one end of the first connecting segment 121a is connected to and arc-transited with the first circular arc portion 116b of the first low wave 112 of the first upper wave-shaped unit 110a, and the other end is connected to and arc-transited with one end of the first extending segment 122. The first extending segment 122 extends in the circumferential direction. The other end of the first extending segment 122 is connected to and arc-transited with one end of the first connecting segment 121b. The first connecting segment 121b extends obliquely to the axial direction, and the other end of the first connecting segment 121b is connected to and arc-transited with the first circular arc portion 116a of the first high wave 111 of the first lower wave-shaped unit 110b. The first connecting segment 121a and the first connecting segment 121b are symmetric to the center of the first extending segment 122, that is, the center of the first extending segment 122 is the origin O of the first connecting rod 12.

[0149] In this way, the first upper wave-shaped unit 110a and the first lower wave-shaped unit 110b can be fixedly connected through the first connecting rod 12a, so as to ensure the structural stability of the support body 1000. Moreover, when the support body 1000 is radially expanded, since the first extending segment 122 is arc-transited with the first connecting segment 121a and the first connecting segment 121b, the deformation of the first connecting rod 12a can be avoided from being greatly offset in the axial direction, so as to ensure the uniform deformation of the first connecting rod 12a, ensure the uniform force bearing of the two first wave-shaped units 110 axially adjacent to the first connecting rod 12a, and ensure the uniformity of the support body 1000 after being expanded.

[0150] In other embodiments, the first extending segment 122 can also extend obliquely to the circumferential direction. The first connecting segment 121a and the first connecting segment 121b can also extend in the axial direction, which is not limited in the present application.

[0151] In addition, in the illustrated embodiment, the two first wave-shaped connecting rings 11 axially adjacent to each other are fixedly connected through two first connecting rods 12a. The two first connecting rods 12a are arranged at intervals. In other embodiments, the two first wave-shaped connecting rings 11 axially adjacent to each other can also be fixedly connected through more first connecting rods 12a.

[0152] In addition, in the illustrated embodiment, the first upper wave unit 110a and the first lower wave unit 110b connected with the first connecting rod 12a are spaced two first wave units 110 in the circumferential direction, and each first connecting rod 12a blocks two first arc portions 116 in the axial direction. In this way, the number of first connecting rods 12a is reduced on the basis of ensuring the connecting strength between the two first wave connecting rings 11 axially adjacent to each other, and the flexibility of the stent body 1000 is improved.

[0153] Referring to Figure 20 , Figure 21 , in some embodiments, the first connecting rod 12 is a straight rod. In this way, the structure is simple, and the processing is facilitated, and the processing cost is low.

[0154] In the illustrated embodiment, the number of first connecting rods 12 is multiple, and the multiple first connecting rods 12 include multiple first connecting rods 12a, the first connecting rod 12a extends obliquely to the axial direction, one end of the first connecting rod 12a is connected with the first arc portion 116b of the first low wave 112 of the first upper wave unit 110a and is arc transitioned, and the other end of the first connecting rod 12a is connected with the first arc portion 116a of the first high wave 111 of the first lower wave unit 110b and is arc transitioned. In this way, each first connecting rod 12a can be connected with the first upper wave unit 110a and the first lower wave unit 110b axially adjacent to each other, and the connecting strength of the two first wave connecting rings 11 axially adjacent to each other is greatly enhanced, and the structural stability of the stent body 1000 is improved. Moreover, the structure is simple, the processing is facilitated, and the processing cost is low. In other embodiments, the first connecting rod 12a can also extend in the axial direction, and the present application is not limited in this regard.

[0155] In addition, in the illustrated embodiment, the first upper wave unit 110a and the first lower wave unit 110b connected with the first connecting rod 12a are spaced two first wave units 110 in the circumferential direction, and each first connecting rod 12a blocks two first arc portions 116 in the axial direction. In this way, the number of first connecting rods 12a is reduced on the basis of ensuring the connecting strength between the two first wave connecting rings 11 axially adjacent to each other, and the flexibility of the stent body 1000 is improved.

[0156] Referring to Figure 1 , Figure 9 , Figure 12 , Figure 15 , Figure 17 , Figure 20 , and Figure 28In some embodiments, the stent body 1000 further comprises a second wave-shaped connecting ring 20 arranged at each of the two axially opposite ends of the main body portion 10. The second wave-shaped connecting ring 20 comprises a plurality of second wave-shaped units 21 connected in the circumferential direction. In this way, the two ends of the stent body 1000 have better radial support force by arranging the second wave-shaped connecting ring 20 at the two ends of the main body portion 10, thereby achieving the effect of stabilizing the stent body 1000.

[0157] In Figure 1 , Figure 22 and Figure 23 In the embodiments shown in the drawings, the number of the second wave-shaped connecting rings 20 is two, and the two second wave-shaped connecting rings 20 are arranged at the proximal end and the distal end of the stent body 1000, respectively. Among them, the two second wave-shaped connecting rings 20 are symmetric with respect to the geometric center of the stent body 1000. In other embodiments, the number of the second wave-shaped connecting rings 20 can also be one.

[0158] In the embodiments shown in the drawings, the two second wave-shaped connecting rings 20 are both closed loop structures. Each second wave-shaped connecting ring 20 further comprises a plurality of connecting pieces 22. In circumferentially adjacent two second wave-shaped units 21, one end of the connecting piece 22 is connected with one second wave-shaped unit 21, and the other end of the connecting piece 22 is connected with the other second wave-shaped unit 21. The circumferentially adjacent two second wave-shaped units 21 are connected in the circumferential direction through the connecting piece 22.

[0159] Specifically, the second wave-shaped unit 21 comprises a second high wave 211 and a second low wave 212. The second high wave 211 is located on the side of the second low wave 212 away from the main body portion 10. The second high wave 211 and the second low wave 212 both comprise two second wave rods 213 and a second circular arc portion 214. The two second wave rods 213 of the second high wave 211 are a second wave rod 213a and a second wave rod 213b, respectively. The second wave rod 213a, the second circular arc portion 214a of the second high wave 211, and the second wave rod 213b are arranged in the circumferential direction in sequence. One end of the second wave rod 213a away from the main body portion 10 is connected with one end of the second circular arc portion 214a, the other end of the second circular arc portion 214a is connected with one end of the second wave rod 213b away from the main body portion 10, and the other end of the second wave rod 213a and the other end of the second wave rod 213b are arranged in a spaced manner. Among them, the second wave rod 213a and the second wave rod 213b are both bent rods, specifically arc-shaped rods. In the axial direction, the distance between the second wave rod 213a and the second wave rod 213b in the circumferential direction gradually decreases from the same end to the other end and then gradually increases. The distance between the central part of the second wave rod 213a in the axial direction and the central part of the second wave rod 213b in the axial direction in the circumferential direction is the smallest.

[0160] The two second wave rods 213 of the second low wave 212 are respectively a second wave rod 213c and a second wave rod 213d. The second wave rod 213c, the second circular arc part 214b of the second low wave 212 and the second wave rod 213d are sequentially arranged in the circumferential direction, one end of the second wave rod 213c close to the main body part 10 is connected with one end of the second circular arc part 214b, the other end of the second circular arc part 214b is connected with one end of the second wave rod 213d close to the main body part 10, and the other end of the second wave rod 213c and the other end of the second wave rod 213d are arranged at intervals. Wherein, the second wave rod 213c and the second wave rod 213d are both curved rods, specifically arc-shaped rods. In the axial direction, the distance between the second wave rod 213c and the second wave rod 213d in the circumferential direction gradually decreases from the same end to the other end and gradually increases. The distance between the middle of the second wave rod 213c in the axial direction and the middle of the second wave rod 213d in the axial direction in the circumferential direction is the smallest.

[0161] One end of the second wave rod 213a close to the main body part 10 is connected with one end of the second wave rod 213c away from the main body part 10, and one end of the second wave rod 213c close to the main body part 10 is connected with one end of the second wave rod 213d away from the main body part 10. In the two second wave units 21 adjacent in the circumferential direction, the connecting piece 22 is connected between the two second wave units 21. Wherein, one end of the connecting piece 22 is located at the connection position of the second wave rod 213a and the second wave rod 213c of one second wave unit 21, and the other end of the connecting piece 22 is located at the connection position of the second wave rod 213c and the second wave rod 213d of the other second wave unit 21.

[0162] In this way, the plurality of second wave units 21 can be connected in the circumferential direction by the connecting pieces 22 to form a whole, improving the structural stability of the second wave connection ring 20, so that the two ends of the stent body 1000 have good radial support force through the second wave connection ring 20 arranged at the two ends of the main body part 10, so as to achieve the effect of stabilizing the stent body 1000. Moreover, without changing the axial length of the stent body 1000, the length of the second wave rod 213 designed in this way can be larger, which is beneficial to the uniform stress of the second wave rod 213 when deforming, ensures the uniform stress of the second wave connection ring 20 when deforming, and further helps to ensure the uniformity of the stent body 1000 after being expanded in the radial direction.

[0163] In the illustrated embodiment, each connecting piece 22 extends in the circumferential direction. The circumferentially adjacent two second wave units 21 are connected in the circumferential direction by one connecting piece 22. In other embodiments, each connecting piece 22 can also extend obliquely to the circumferential direction. The circumferentially adjacent two second wave units 21 can also be connected in the circumferential direction by more connecting pieces 22, which is not limited in the present application.

[0164] In the illustrated embodiment, the second high wave 211 and the second low wave 212 of each second wave-shaped unit 21 are symmetric relative to the center of the second wave-shaped unit 21. In this way, the second wave-shaped unit 21 is ensured to be uniformly stressed when deformed, the second wave-shaped connecting ring 20 is ensured to be uniformly stressed when deformed, and the stent body 1000 is ensured to be uniform after being radially expanded.

[0165] In addition, in the second wave-shaped connecting ring 20, the common tangent directions of the second arc portions 214a of the second high waves 211 of the plurality of second wave-shaped units 21 are parallel to the common tangent directions of the second arc portions 214b of the second low waves 212 of the plurality of second wave-shaped units 21, specifically, both extend in the circumferential direction. This not only facilitates uniform stress on the second wave-shaped connecting ring 20 when deformed, facilitates uniform stress on the second wave-shaped connecting ring 20 when deformed, ensures the uniformity of the stent body 1000 after being expanded, but also facilitates processing and reduces processing costs.

[0166] In addition, in the axial direction, the widths of the second wave rods 213a, 213b, 213c, and 213d gradually increase from the middle portions to the two ends, respectively. In the circumferential direction, the widths of the second arc portions 214a and 214b gradually decrease from the middle portions to the two ends. The width of the middle portion of the second wave rod 213a, the width of the middle portion of the second wave rod 213b, the width of the middle portion of the second wave rod 213c, and the width of the middle portion of the second wave rod 213d are equal and are the first width D1. The width of the middle portion of the second arc portion 214a and the width of the middle portion of the second arc portion 214b are related and are the second width D2. It can be understood that the second width D2 is greater than the first width D1.

[0167] When the stent body 1000 is radially expanded, the stress concentration of the middle portions of the two second arc portions 214 is high, and the stress concentration of the middle portions of the four second wave rods 213 is low. Such a design can effectively avoid the risk of fracture of the second wave-shaped unit 21, improve the structural stability of the second wave-shaped unit 21, improve the structural stability of the second wave-shaped connecting ring 20, and further improve the structural stability of the stent body 1000.

[0168] Optionally, the second width D2 is equal to twice the first width D1. In the illustrated embodiment, the first width D1 is 0.14 mm, and the second width D2 is 0.28 mm. In other embodiments, the first width D1 can also be 0.12 mm, and the second width can be 0.24 mm.

[0169] In Figure 9 to Figure 11In the shown embodiment, the number of the second wave-shaped connecting rings 20 is two, and the two second wave-shaped connecting rings 20 are respectively arranged at the proximal end and the distal end of the stent body 1000. The two second wave-shaped connecting rings 20 are symmetric with respect to the geometric center of the stent body 1000. Both of the two second wave-shaped connecting rings 20 are closed loop structures. Each of the second wave-shaped connecting rings 20 further comprises a plurality of connecting pieces 22. In the circumferentially adjacent two second wave-shaped units 21, one end of the connecting piece 22 is connected with one second wave-shaped unit 21, and the other end of the connecting piece 22 is connected with the other second wave-shaped unit 21. The circumferentially adjacent two second wave-shaped units 21 are connected in the circumferential direction through the connecting piece 22.

[0170] Figure 9 to Figure 11 The second wave-shaped connecting ring 20 of the shown embodiment is similar to the second wave-shaped connecting ring 20 of the above-mentioned Figure 1 、 Figure 22 and Figure 23 The second wave-shaped connecting ring 20 of the shown embodiment is similar to the second wave-shaped connecting ring 20 of the above-mentioned

[0171] Specifically, in the shown embodiment, the second wave-shaped unit 21 comprises a second high wave 211 and a second low wave 212. The second high wave 211 is located on the side of the second low wave 212 away from the main body part 10. Both of the second high wave 211 and the second low wave 212 comprise two second wave rods 213 and a second circular arc part 214. The two second wave rods 213 of the second high wave 211 are respectively a second wave rod 213a and a second wave rod 213b. The second wave rod 213a, the second circular arc part 214a of the second high wave 211 and the second wave rod 213b are sequentially arranged in the circumferential direction. Figure 9 to Figure 11

[0172] The one end of the second wave rod 213a away from the main body part 10 is connected with the one end of the second circular arc part 214a, the other end of the second circular arc part 214a is connected with the one end of the second wave rod 213b away from the main body part 10, and the other end of the second wave rod 213a and the other end of the second wave rod 213b are connected with the second low wave 212. Specifically, the second wave rod 213a comprises a first section 2131a and a second section 2132a connected with each other, the first section 2131a is connected with the second circular arc part 214a, and the second section 2132a is connected with the second low wave 212. The second wave rod 213b comprises a first section 2131b and a second section 2132b connected with each other, the first section 2131b is connected with the second circular arc part 214a, and the second section 2132b is connected with the second low wave 212. Among them, in the axial direction, the distance between the first section 2131a and the first section 2131b in the circumferential direction gradually increases and then gradually decreases from the same end to the other end of the two; the distance between the second section 2132a and the second section 2132b in the circumferential direction gradually increases from the one end of the two away from the main body part 10 to the other end.

[0173] ​The two second wave rods 213 of the second low wave 212 are respectively a second wave rod 213c and a second wave rod 213d. The second wave rod 213c, the second circular arc part 214b of the second low wave 212, and the second wave rod 213d are sequentially arranged in the circumferential direction, one end of the second wave rod 213c close to the main body part 10 is connected with one end of the second circular arc part 214b, the other end of the second circular arc part 214b is connected with one end of the second wave rod 213d close to the main body part 10, and the other end of the second wave rod 213c and the other end of the second wave rod 213d are connected with the second high wave 211. Specifically, the second wave rod 213c includes a first segment 2131c and a second segment 2132c connected with each other, the first segment 2131c is connected with the second circular arc part 214b, and the second segment 2132c is connected with the second segment 2132a of the second wave rod 213a. The second wave rod 213d includes a first segment 2131d and a second segment 2132d connected with each other, the first segment 2131d is connected with the second circular arc part 214b, and the second segment 2132d is connected with the second segment 2132b of the second wave rod 213b. Among them, in the axial direction, the distance between the first segment 2131c and the first segment 2131d in the circumferential direction gradually increases and then gradually decreases from the same end to the other end of the two; the distance between the second segment 2132c and the second segment 2132d in the circumferential direction gradually increases from one end close to the main body part 10 to the other end.

[0174] In the two second wave units 21 adjacent in the circumferential direction, the connecting piece 22 is connected between the two second wave units 21. Among them, one end of the connecting piece 22 is connected at the connection position of the second wave rod 213a and the second wave rod 213c of one second wave unit 21, and the other end of the connecting piece 22 is connected at the connection position of the second wave rod 213b and the second wave rod 213d of the other second wave unit 21.

[0175] In this way, the plurality of second wave units 21 can also be connected in the circumferential direction by the connecting piece 22 to form a whole, so as to ensure the structural stability of the second wave connection ring 20. Therefore, through the second wave connection ring 20 arranged at both ends of the main body part 10, the two ends of the stent body 1000 can also have good radial support force, so as to achieve the effect of stabilizing the stent body 1000. Moreover, without changing the axial length of the stent body 1000, the length of the second wave rod 213 designed in this way is also large, which is beneficial to uniform stress when the second wave rod 213 deforms, so as to ensure uniform stress when the second wave unit 21 and the second wave connection ring 20 deform, and further ensure the uniformity of the stent body 1000 after being expanded in the radial direction.

[0176] In Figure 12 to Figure 14In the illustrated embodiment, there are two second waveform connecting rings 20, which are respectively disposed at the proximal and distal ends of the support body 1000. The two second waveform connecting rings 20 are symmetrical about the geometric center of the support body 1000. Both second waveform connecting rings 20 are closed-loop ring structures. Each second waveform connecting ring 20 also includes multiple connectors 22. In two circumferentially adjacent second waveform units 21, one end of the connector 22 is connected to one second waveform unit 21, and the other end is connected to the other second waveform unit 21. Two circumferentially adjacent second waveform units 21 are circumferentially connected by the connectors 22.

[0177] Figure 12 to Figure 14 The second waveform connecting ring 20 of the illustrated embodiment is related to the above-described... Figure 9 to Figure 11 The second waveform connecting ring 20 in the illustrated embodiment has a similar structure, but the difference lies in the structure of the second waveform unit 21.

[0178] Specifically, in Figure 12 to Figure 14 In the second waveform connecting ring 20 shown, in one second waveform unit 21, each second wave rod 213 is a straight rod. The second wave rod 213a of the second high wave 211 is connected to the second wave rod 213d of the second low wave 212, while the second wave rod 213b of the second high wave 211 and the second wave rod 213c of the second low wave 212 are not connected. The second wave rod 213b is connected to the second wave rod 213c of the second low wave 212 of another second waveform unit 21, and the second wave rod 213c is connected to the second wave rod 213b of the second high wave 211 of yet another second waveform unit 21. That is, multiple second waveform units 21 are connected end-to-end along the circumferential direction. In this case, the connector 22 is designed to improve the connection strength between two circumferentially adjacent second waveform units 21, thereby improving the structural stability of the second waveform connecting ring 20 and the support body 1000. It is understood that in other embodiments, the connector 22 may be omitted.

[0179] Figure 12 to Figure 14 The second waveform connecting ring 20 of the illustrated embodiment is related to the above-described... Figure 9 to Figure 11The second wave-shaped connecting ring 20 of the illustrated embodiment is also different in that the circumferentially adjacent two second wave units 21 are circumferentially connected by two connecting pieces 22. Specifically, between the circumferentially adjacent two second wave units 21, one connecting piece 22 is connected between the second wave rod 213b of one second wave unit 21 and the second wave rod 213a of the other second wave unit 21. The other connecting piece 22 is connected between the second wave rod 213d of one second wave unit 21 and the second wave rod 213c of the other second wave unit 21. The second wave-shaped connecting ring 20 thus designed has stronger structural stability, which is conducive to improving the structural stability of the stent body 1000. In other embodiments, the number of connecting pieces 22 can also be more.

[0180] In Figure 15 to Figure 16 In the illustrated embodiment, the number of second wave-shaped connecting rings 20 is two, and the two second wave-shaped connecting rings 20 are respectively arranged at the proximal end and the distal end of the stent body 1000. The two second wave-shaped connecting rings 20 are symmetric with respect to the geometric center of the stent body 1000. Both of the two second wave-shaped connecting rings 20 are closed loop structures. Figure 15 to Figure 16 The second wave-shaped connecting ring 20 of the illustrated embodiment is similar in structure to the second wave-shaped connecting ring 20 described above, and the difference between the two lies in that, Figure 1 、 Figure 22 and Figure 23 The second wave-shaped connecting ring 20 of the illustrated embodiment has the same structure as the second wave-shaped connecting ring 20 described above, and thus will not be described again.

[0181] In Figure 17 to Figure 19 In the illustrated embodiment, the number of second wave-shaped connecting rings 20 is two, and the two second wave-shaped connecting rings 20 are respectively arranged at the proximal end and the distal end of the stent body 1000. The two second wave-shaped connecting rings 20 are symmetric with respect to the geometric center of the stent body 1000. Both of the two second wave-shaped connecting rings 20 are closed loop structures.

[0182] Figure 17 to Figure 19 The second wave-shaped connecting ring 20 of the illustrated embodiment is similar in structure to the second wave-shaped connecting ring 20 described above, and the difference between the two lies in that, Figure 9 to Figure 11 The second wave-shaped connecting ring 20 of the illustrated embodiment has the same structure as the second wave-shaped connecting ring 20 described above, and thus will not be described again. Figure 17 to Figure 19 The second wave-shaped connecting ring 20 of the illustrated embodiment omits the connecting pieces 22. At this time, the second wave-shaped connecting rings 20 arranged at both ends of the main body part 10 can also make the two ends of the stent body 1000 have good radial support force, so as to achieve the effect of stabilizing the stent body 1000.

[0183] InFigure 28 to Figure 29 In the illustrated embodiment, there are two second waveform connecting rings 20, which are respectively disposed at the proximal and distal ends of the support body 1000. The two second waveform connecting rings 20 are symmetrical about the geometric center of the support body 1000. Both second waveform connecting rings 20 are closed-loop ring structures. Each second waveform connecting ring 20 also includes multiple connectors 22. In two circumferentially adjacent second waveform units 21, one end of the connector 22 is connected to one second waveform unit 21, and the other end is connected to the other second waveform unit 21. Two circumferentially adjacent second waveform units 21 are circumferentially connected by the connectors 22.

[0184] Figure 28 to Figure 29 The second waveform connecting ring 20 of the illustrated embodiment is related to the above-described... Figure 1 , Figure 22 and Figure 23 The second waveform connecting ring 20 in the illustrated embodiment has a similar structure, but the difference lies in the structure of the second waveform unit 21.

[0185] Specifically, in Figure 28 to Figure 29 In the illustrated embodiment, the plurality of second waveform units 21 include a plurality of second waveform units 21a and a second waveform unit 21b, which are arranged circumferentially. Each second waveform unit 21 includes a second high wave 211 and a second low wave 212. The second high wave 211 is located on the side of the second low wave 212 away from the main body 10. Both the second high wave 211 and the second low wave 212 include two second wave rods 213 and a second arcuate portion 214 connecting the two second wave rods 213.

[0186] In the second wave unit 21a, the two second wave rods 213 of the second high wave 211 are respectively a second wave rod 213a and a second wave rod 213b. The second wave rod 213a, the second circular arc part 214a of the second high wave 211, and the second wave rod 213b are sequentially arranged in the circumferential direction. One end of the second wave rod 213a away from the main body part 10 is connected to one end of the second circular arc part 214a, the other end of the second circular arc part 214a is connected to one end of the second wave rod 213b away from the main body part 10, and the other end of the second wave rod 213a and the other end of the second wave rod 213b are connected to the second low wave 212. Specifically, the second wave rod 213a includes a first segment 2131a and a second segment 2132a connected in sequence, the first segment 2131a is connected to the second circular arc part 214a, and the second segment 2132a is connected to the second low wave 212. The second wave rod 213b includes a first segment 2131b and a second segment 2132b connected in sequence, the first segment 2131b is connected to the second circular arc part 214a, and the second segment 2132b is connected to the second low wave 212. Among them, the first segment 2131a and the first segment 2131b extend along the axial direction, and the distance between the second segment 2132a and the second segment 2132b in the circumferential direction gradually increases from one end of the second segment 2132a and the second segment 2132b close to the main body part 10 to the other end.

[0187] The two second wave rods 213 of the second low wave 212 are respectively a second wave rod 213c and a second wave rod 213d. The second wave rod 213c, the second circular arc part 214b of the second low wave 212, and the second wave rod 213d are sequentially arranged in the circumferential direction, one end of the second wave rod 213c close to the main body part 10 is connected to one end of the second circular arc part 214b, the other end of the second circular arc part 214b is connected to one end of the second wave rod 213d close to the main body part 10, and the other end of the second wave rod 213c and the other end of the second wave rod 213d are connected to the second high wave 211. Specifically, the second wave rod 213c includes a first segment 2131c and a second segment 2132c connected in sequence, the first segment 2131c is connected to the second circular arc part 214b, and the second segment 2132c is connected to the second segment 2132a of the second wave rod 213a. The second wave rod 213d includes a first segment 2131d and a second segment 2132d connected in sequence, the first segment 2131d is connected to the second circular arc part 214b, and the second segment 2132d is connected to the second segment 2132b of the second wave rod 213b. Among them, the first segment 2131c and the first segment 2131d extend along the axial direction; the distance between the second segment 2132c and the second segment 2132d in the circumferential direction gradually increases from one end of the second segment 2132c and the second segment 2132d close to the main body part 10 to the other end.

[0188] Two second wave units 21a which are circumferentially adjacent are connected by a connecting member 22. One end of the connecting member 22 is connected to the connecting position of the second wave rod 213a and the second wave rod 213c of one second wave unit 21a, and the other end of the connecting member 22 is connected to the connecting position of the second wave rod 213b and the second wave rod 213d of another second wave unit 21a. The connecting member 22 connecting the two circumferentially adjacent second wave units 21a extends obliquely to the circumferential direction. In this way, a plurality of second wave units 21a can be connected circumferentially by the connecting members 22 to form a whole.

[0189] In the second wave unit 21b, the two second wave rods 213 of the second high wave 211 are the second wave rod 213e and the second wave rod 213f. The second wave rod 213e, the second circular arc portion 214a of the second high wave 211, and the second wave rod 213f are arranged in sequence along the circumferential direction. One end of the second wave rod 213e away from the main body portion 10 is connected to one end of the second circular arc portion 214a, the other end of the second circular arc portion 214a is connected to one end of the second wave rod 213f away from the main body portion 10, the other end of the second wave rod 213e is connected to one second wave unit 21a, and the other end of the second wave rod 213f is connected to the second low wave 212. Specifically, the second wave rod 213e includes a first segment 2131e and a second segment 2132e connected in sequence, the first segment 2131e is connected to the second circular arc portion 214a, and the second segment 2132e is connected to the second wave unit 21a circumferentially adjacent to the second wave unit 21b through a connecting member 22. The second wave rod 213f includes a first segment 2131f and a second segment 2132f connected in sequence, the first segment 2131f is connected to the second circular arc portion 214a, and the second segment 2132f is connected to the second low wave 212. The first segment 2131e and the first segment 2131f both extend along the axial direction, and the distance between the second segment 2132e and the second segment 2132f along the circumferential direction gradually increases from one end of the second segment 2132e and the second segment 2132f away from the main body portion 10 to the other end.

[0190] The two second wave rods 213 of the second low wave 212 are the second wave rod 213g and the second wave rod 213h. The second wave rod 213g, the second circular arc portion 214b of the second low wave 212, and the second wave rod 213h are arranged in sequence along the circumferential direction. One end of the second wave rod 213g close to the main body portion 10 is connected to one end of the second circular arc portion 214b, the other end of the second circular arc portion 214b is connected to one end of the second wave rod 213h close to the main body portion 10, the other end of the second wave rod 213g is connected to one second wave unit 21a circumferentially adjacent to the second wave unit 21b through a connecting member 22, and the other end of the second wave rod 213h is connected to the second high wave 211. The second wave rod 213g and the second wave rod 213h both extend along the axial direction.

[0191] It can be understood that the second wave-shaped unit 21b is connected with the two second wave-shaped units 21a adjacent to it in the circumferential direction by one connecting member 22 respectively. Exemplarily, in one second wave-shaped unit 21a adjacent to the second wave-shaped unit 21b in the circumferential direction and another second wave-shaped unit 21b, one end of one connecting member 22 is connected to the end of the second section 2132e of the second wave rod 213e of the second wave-shaped unit 21b away from the first section 2131e, and the other end of the connecting member 22 is connected to the connecting position of the second wave rod 213b and the second wave rod 213d of one second wave-shaped unit 21b; one end of another connecting member 22 is connected to the end of the second wave rod 213f of the second wave-shaped unit 21b close to the second high wave 211, and the other end of the connecting member 22 is connected to the connecting position of the second wave rod 213a and the second wave rod 213c of another second wave-shaped unit 21a.

[0192] In this way, the plurality of second wave-shaped units 21a and the second wave-shaped unit 21b can be connected in the circumferential direction by the connecting members 22 to form an entirety, so as to ensure the structural stability of the second wave-shaped connecting ring 20. Thus, by arranging the second wave-shaped connecting ring 20 at both ends of the main body part 10, the two ends of the stent body 1000 can have better radial support force, so as to achieve the effect of stabilizing the stent body 1000. Moreover, without changing the axial length of the stent body 1000, the length of the second wave rod 213 designed in this way is also large, which is beneficial to the uniform stress of the second wave rod 213 when deforming, and ensures the uniform stress of the second wave-shaped unit 21 and the second wave-shaped connecting ring 20 when deforming, and further ensures the uniformity of the stent body 1000 after being expanded in the radial direction.

[0193] Further, the thickness of the second wave-shaped unit 21 in the radial direction gradually increases in the direction away from the main body part 10 in the axial direction of the stent body 1000. In this way, the radial support strength of the second wave-shaped connecting ring 20 away from the main body part 10 is enhanced, the radial support strength of the two ends of the stent body 1000 is improved, and further the supportability of the stent body 1000 to the blood vessel is improved.

[0194] Please refer to Figure 1 , Figure 22 and Figure 24 In some embodiments, the stent body 1000 further comprises a third wave-shaped connecting ring 30, a second connecting rod 40 and a third connecting rod 50. The third wave-shaped connecting ring 30 is connected between the second wave-shaped connecting ring 20 and the first wave-shaped connecting ring 11, and the third wave-shaped connecting ring 30 comprises a plurality of third wave-shaped units 31 connected in the circumferential direction, and the third wave-shaped connecting ring 30 is a circumferential closed loop structure. The second connecting rod 40 connects the third wave-shaped connecting ring 30 and the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30. The third connecting rod 50 connects the third wave-shaped connecting ring 30 and the second wave-shaped connecting ring 20 axially adjacent to the third wave-shaped connecting ring 30.

[0195] In this way, the third wave-shaped connecting ring 30 is connected to the first wave-shaped connecting ring 11 axially adjacent thereto by the second connecting rod 40, and the third wave-shaped connecting ring 30 is connected to the second wave-shaped connecting ring 20 axially adjacent thereto by the third connecting rod 50. In addition, the design of the third wave-shaped connecting ring 30 with a circumferential closed loop structure between the first wave-shaped connecting ring 11 and the second wave-shaped connecting ring 20 further improves the radial support strength of the stent body 1000 due to the better radial support force of the third wave-shaped connecting ring 30 with a circumferential closed loop structure, thereby improving the support of the stent body 1000 to the blood vessel.

[0196] In the illustrated embodiment, the number of third wave-shaped connecting rings 30 is two, one third wave-shaped connecting ring 30 is connected between one second wave-shaped connecting ring 20 and the first wave-shaped connecting ring 11 axially adjacent thereto, and the other third wave-shaped connecting ring 30 is connected between the other second wave-shaped connecting ring 20 and the first wave-shaped connecting ring 11 axially adjacent thereto. In other embodiments, the number of third wave-shaped connecting rings 30 can also be one.

[0197] Please refer to Figure 1 , Figure 22 and Figure 24 In some embodiments, the third wave-shaped unit 31 includes a third high wave 311 and a third low wave 312. The third high wave 311 is close to the second wave-shaped connecting ring 20 and protrudes towards the second wave-shaped connecting ring 20. One end of the third low wave 312 in one of the third wave-shaped units 31, one end of the third high wave 311 connected to the third wave-shaped unit 31, and the other end of the third low wave 312 connected to the third high wave 311 of another third wave-shaped unit 31. The third low wave 312 is close to the first wave-shaped connecting ring 11 and protrudes towards the first wave-shaped connecting ring 11.

[0198] In which, the third high wave 311 and the third low wave 312 each include a third outer arc segment 313 and a third inner arc segment 314 arranged along the axial direction. The third outer arc segment 313a of the third high wave 311 is closer to the second wave-shaped connecting ring 20 than the third inner arc segment 314a of the third high wave 311. The third outer arc segment 313b of the third low wave 312 is closer to the first wave-shaped connecting ring 11 than the third inner arc segment 314b of the third low wave 312. In the same third high wave 311 or third low wave 312, the center of the third outer arc segment 313 of the third high wave 311 and / or the third low wave 312 is offset to the third outer arc segment 313 relative to the center of the third inner arc segment 314.

[0199] When the stent body 1000 is radially expanded, the third wave-shaped connecting ring 30 is radially expanded with the stent body 1000, and the third wave-shaped unit 31 is unfolded with the expansion of the third wave-shaped connecting ring 30. Since the center of the third outer arc segment 313 of the third high wave 311 and / or the third low wave 312 is offset to the third outer arc segment 313 relative to the center of the third inner arc segment 314, the maximum stress on the corresponding third wave-shaped unit 31 during unfolding can be reduced, the stress deformation of the corresponding third wave-shaped connecting ring 30 during expansion can be reduced, the uniform expansion of the third wave-shaped connecting ring 30 can be ensured, and the uniformity of the stent body 1000 after expansion can be ensured, thereby ensuring the treatment effect of the stent body 1000 on the blood vessel disease.

[0200] In the illustrated embodiment, in each third wave-shaped unit 31, the center of the third outer arc segment 313a of the third high wave 311 is offset to the third outer arc segment 313a of the third high wave 311 relative to the center of the third inner arc segment 314a of the third high wave 311; and the center of the third outer arc segment 313b of the third low wave 312 is offset to the third outer arc segment 313b of the third low wave 312 relative to the center of the third inner arc segment 314b of the third low wave 312. In this way, the maximum stress on the corresponding first wave-shaped unit 110 during unfolding can be further reduced, and the first wave-shaped unit 110 can be uniformly unfolded, thereby further ensuring the uniformity of the stent body 1000 after expansion.

[0201] In other embodiments, in each third wave-shaped unit 31, the center of the third outer arc segment 313a of the third high wave 311 can be offset to the third outer arc segment 313a of the third high wave 311 relative to the center of the third inner arc segment 314a of the third high wave 311; the center of the third outer arc segment 313b of the third low wave 312 can be concentric with the center of the third inner arc segment 314b of the third low wave 312; or the center of the third outer arc segment 313a of the third high wave 311 can be concentric with the center of the third inner arc segment 314a of the third high wave 311; and the center of the third outer arc segment 313b of the third low wave 312 can be offset to the third outer arc segment 313b of the third low wave 312 relative to the center of the third inner arc segment 314b of the third low wave 312, which is not limited in the present application.

[0202] Please refer to Figure 1 , Figure 22 , Figure 24 and Figure 25In some embodiments, the third high wave 311 and the third low wave 312 comprise two connected third wave rods 315, and in one third wave unit 31, one of the third wave rods 315 of the third high wave 311 is connected to one of the third wave rods 315 of the third low wave 312. In one third wave unit 31, the third high wave 311 and the third low wave 312 are connected to form an integral whole, thereby improving the structural stability of the third wave unit 31.

[0203] Specifically, as shown in Figure 22 、 Figure 24 and Figure 25 , the third high wave 311 and the third low wave 312 each further comprise a third arc portion 316. The two third wave rods 315 of the third high wave 311 are respectively connected to two ends of a third arc portion 316a of the third high wave 311 away from one end of the first wave-form connecting ring 11. The two third wave rods 315 of the third high wave 311 are connected through the third arc portion 316a of the third high wave 311. The two third wave rods 315 of the third low wave 312 are respectively connected to two ends of a third arc portion 316b of the third low wave 312 close to one end of the first wave-form connecting ring 11. The two third wave rods 315 of the third low wave 312 are connected through the third arc portion 316b of the third low wave 312. The third arc portion 316a comprises the first outer arc segment 113a and the first inner arc segment 114a, and the third arc portion 316b comprises the first outer arc segment 113b and the first inner arc segment 114b.

[0204] In the illustrated embodiments, the two third wave rods 315 of the third high wave 311 are respectively a third wave rod 315a and a third wave rod 315b, and the third wave rod 315a, the third arc portion 316a and the third wave rod 315b are sequentially arranged in the circumferential direction. The end of the third wave rod 315a away from one end of the first wave-form connecting ring 11 is connected to one end of the third arc portion 316a, the other end of the third arc portion 316b is connected to the end of the third wave rod 315b away from one end of the first wave-form connecting ring 11, and the end of the third wave rod 315a close to one end of the first wave-form connecting ring 11 is arranged in a spaced manner with the end of the third wave rod 315b close to one end of the first wave-form connecting ring 11. The two third wave rods 315 of the third low wave 312 are respectively a third wave rod 315c and a third wave rod 315d, and the third wave rod 315c, the third arc portion 316b and the third wave rod 315d are arranged in the circumferential direction. The end of the third wave rod 315c close to one end of the first wave-form connecting ring 11 is connected to one end of the third arc portion 316b, the other end of the third arc portion 316b is connected to the end of the third wave rod 315d close to one end of the first wave-form connecting ring 11, and the end of the third wave rod 315c away from one end of the first wave-form connecting ring 11 is arranged in a spaced manner with the end of the third wave rod 315d away from one end of the first wave-form connecting ring 11.

[0205] In one third wave unit 31, the third wave rods 315c, 315d, 315a and 315b are sequentially arranged in the circumferential direction, the third wave rod 315d is connected with the third wave rod 315a, that is, one of the third wave rods 315 of the third high wave 311 is connected with one of the third wave rods 315 of the third low wave 312. Thus, in one third wave unit 31, the third high wave 311 is connected with the third low wave 312 to form a whole, which improves the structural stability of the third wave unit 31.

[0206] In the third wave unit 31, the third wave rod 315d is integrally formed with the third wave rod 315a. In this way, it is beneficial to the uniform stress distribution of the third wave unit 31, and further beneficial to the uniform expansion of the third wave unit 31, and further ensure the uniformity of the stent body 1000 after expansion. In other embodiments, the third wave rod 315d and the third wave rod 315a can also be connected stably by welding, gluing or buckling, etc. The present application does not make any limitation on this.

[0207] In the illustrated embodiment, as shown in Figure 22 , Figure 24 and Figure 25 , the third wave connecting ring 30 includes sixteen third wave units 31. In the sixteen third wave units 31, any three third wave units 31 sequentially arranged adjacent in the circumferential direction are respectively a third left wave unit, a third middle wave unit and a third right wave unit, and the third middle wave unit is located between the third left wave unit and the third right wave unit. The third wave rod 315c of the third middle wave unit is connected with the third wave rod 315b of the third left wave unit; the third wave rod 315b of the third high wave 311 of the third middle wave unit is connected with the third wave rod 315c of the third right wave unit. Thus, in one third wave connecting ring 30, each third wave unit 31 can be connected in the circumferential direction to form a closed loop structure, which improves the structural stability of the third wave connecting ring 30.

[0208] It should be noted that each third wave unit 31 in the third wave connecting ring 30 can be integrally formed, which is beneficial to the uniform stress distribution of the third wave connecting ring 30, and further beneficial to the uniform expansion of the third wave connecting ring 30, and further ensure the uniformity of the stent body 1000 after expansion.

[0209] In other embodiments, the third wave connecting ring 30 can also include only two third wave units 31 or more third wave units 31. The present application does not make any limitation on this.

[0210] It should be noted that the more the number of third wave units 31 in the third wave connecting ring 30, the more uniform the stress distribution of the third wave connecting ring 30 during expansion, and the more beneficial to improve the uniformity of the stent body 1000 after expansion.

[0211] As shown in Figure 24 , when the stent body 1000 (as shown in Figure 1 ) is in an unexpanded state, the tangent of the third wave rod 315a and the tangent of the third wave rod 315b are parallel to the axial direction of the stent body 1000. The tangent of the third wave rod 315c and the tangent of the third wave rod 315d are parallel to the axial direction of the stent body 1000.

[0212] It should be noted that in the present application, the tangent of the third wave rod 315 of the third high wave 311 is parallel to the extension direction of the third wave rod 315 and tangent to the third outer arc segment 313a of the third high wave 311; the tangent of the third wave rod 315 of the third low wave 312 is parallel to the extension direction of the third wave rod 315 and tangent to the third outer arc segment 313b of the third low wave 312, which can be understood in the same way hereinafter, and will not be repeated.

[0213] As shown in Figure 25 , when the stent body 1000 (as shown in Figure 1 ) in an unexpanded state is radially expanded to an expanded state, the tangent of the third wave rod 315a and the tangent of the third wave rod 315b are inclined relative to the axial direction of the stent body 1000, and there is a third included angle between the tangent of the third wave rod 315a and the tangent of the third wave rod 315b. The tangent of the third wave rod 315c and the tangent of the third wave rod 315d are inclined relative to the axial direction of the stent body 1000, and there is a fourth included angle between the tangent of the third wave rod 315c and the tangent of the third wave rod 315d, and the third included angle is equal to the fourth included angle.

[0214] In the same third high wave 311 or the same third low wave 312, the included angle Y (third included angle or fourth included angle) between the tangents of the two third wave rods 315 ranges from 30° to 120°. At this time, not only the radial dimension of the third wave-shaped connecting ring 30 meets the requirements, but also it can support the narrow occluded segment of the blood vessel or occlude the blood vessel dissection break, and the effect of covering the covering on the third wave-shaped connecting ring 30 is good, which ensures the safety of the operation. It should be noted that the range of the included angle Y is 30° to 120°, which means that the included angle Y can be 30°, or a value between 30° and 120°, or 120°.

[0215] The design of the included angle Y ranging from 30° to 120°, on the one hand, ensures that the stent body 1000 (as shown in Figure 1On the one hand, the third wave-shaped connecting ring 30 has a large radial dimension, and has a good effect on supporting a narrow occluded segment of a blood vessel or plugging a blood vessel dissection, and has a good treatment effect on a blood vessel disease; on the other hand, the third wave-shaped unit 31 of the stent body 1000 in the expanded state has a good flexibility, the third wave-shaped connecting ring 30 has a good flexibility, and the stent body 1000 has a good flexibility, so that the stent body 1000 can adapt to various deformations of a blood vessel, such as bending and branching, and ensure the effect of the stent body 1000 on the interventional treatment of a blood vessel disease. In addition, such a design is also beneficial to covering the covering on the third wave-shaped connecting ring 30 of the stent body 1000 in the expanded state, and has a good covering effect, thereby ensuring the safety of the operation.

[0216] Specifically, when the included angle Y is less than 30°, the structure of the third wave-shaped unit 31 is relatively compact, so that the structure of the third wave-shaped connecting ring 30 of the stent body 1000 in the expanded state is relatively compact. At this time, the radial dimension of the third wave-shaped connecting ring 30 is small. The third wave-shaped connecting ring 30 not only cannot support a narrow occluded segment of a blood vessel or plug a blood vessel dissection, but also has poor flexibility, and cannot adapt to various deformations of a blood vessel, such as bending, so that the treatment effect of the stent body 1000 is poor. In addition, it is also not conducive to covering the covering on the third wave-shaped connecting ring 30, and the covering effect is poor. During the operation, the covering is easy to separate from the third wave-shaped connecting ring 30, causing a medical accident, and the safety of the operation cannot be ensured.

[0217] When the included angle Y is greater than 120°, the structure of the third wave-shaped unit 31 is relatively loose, so that the structure of the third wave-shaped connecting ring 30 of the stent body 1000 in the expanded state is relatively loose. At this time, the radial dimension of the third wave-shaped connecting ring 30 is easy to be too large, resulting in that the stent body 1000 is difficult to be implanted into a blood vessel. Moreover, during the process of implanting the covering stent into a blood vessel, the third wave-shaped unit 31 is deformed with the stent body 1000 being compressed, and during the operation, the included angle Y of the third wave-shaped unit 31 changes greatly, which is easy to damage the covering located at the third outer arc segment 313a of the third high wave 311 and the third outer arc segment 313b of the third low wave 312, and affects the treatment effect of the operation.

[0218] It can be understood that, on the basis of ensuring that the stent body 1000 in the expanded state can support a narrow occluded segment of a blood vessel or plug a blood vessel dissection, the included angle Y should be selected to be a smaller value between 30° and 120°, so as to avoid that the radial dimension of the stent body 1000 in the expanded state is too large and is difficult to be implanted into a blood vessel.

[0219] In the illustrated embodiment, the angle Y between the tangent of the two third wave bars 315 of the third high wave 311 and the third low wave 312 is 60° when the stent body 1000 is in the expanded state. When the stent body 1000 in the unexpanded state (as shown) is radially expanded, it is convenient for processing and helps to reduce the processing cost. In other embodiments, the angle Y between the tangent of the two third wave bars 315 of the third high wave 311 and the third low wave 312 can also be different, and the angle Y can be any value in the range of 30° to 120°, and the present application does not limit this. Figure 1

[0220] Please refer to Figure 1 、 Figure 24 and Figure 25 In the same third high wave 311, the distance J1 by which the center of the third outer arc segment 313a is offset from the center of the third inner arc segment 314a towards the third outer arc segment 313a is less than or equal to 2 / 3 of the radial width of the third wave bar 315; and / or in the same third low wave 312, the distance J2 by which the center of the third outer arc segment 313b is offset from the center of the third inner arc segment 314b towards the third outer arc segment 313b is less than or equal to 2 / 3 of the radial width of the third wave bar 315. When the stent body 1000 is radially expanded, such design helps to reduce the maximum stress on the third high wave 311 and / or the third low wave 312, thereby reducing the maximum stress on the corresponding third wave unit 31 during expansion, thereby reducing the stress deformation of each part of the third wave connection ring 30 during expansion, and ensuring the uniformity of the stent body 1000 after expansion.

[0221] It should be noted that during the process of radially expanding the stent body 1000 in the unexpanded state (as shown) to the expanded state, the radial width of the third wave bar 315 of the third high wave 311 and the third low wave 312 of each third wave unit 31 does not change; in the same third high wave 311, the distance J1 by which the center of the third outer arc segment 313a is offset from the center of the third inner arc segment 314a towards the third outer arc segment 313a does not change; in the same third low wave 312, the distance J2 by which the center of the third outer arc segment 313b is offset from the center of the third inner arc segment 314b towards the third outer arc segment 313b does not change. Figure 1

[0222] ​​In the illustrated embodiment, in each third wave unit 31, the radial width of the two third wave rods 315 (i.e., the third wave rod 315a and the third wave rod 315b) of the third high wave 311 and the radial width of the two third wave rods 315 (i.e., the third wave rod 315c and the third wave rod 315d) of the third low wave 312 are equal. In this way, it is convenient for processing, which is conducive to reducing the processing cost and conducive to the stress distribution uniformity of the third wave unit 31. Specifically, the radial width of each third wave rod 315 is 0.12 mm. In other embodiments, the radial width of each third wave rod 315 can also be other positive numbers greater than zero, such as 0.14 mm, 0.15 mm, 0.16 mm, etc. The radial width of the two third wave rods 315 (i.e., the third wave rod 315a and the third wave rod 315b) of the third high wave 311 and the radial width of the two third wave rods 315 (i.e., the third wave rod 315c and the third wave rod 315d) of the third low wave 312 can also be unequal, which is not limited by the present application.

[0223] Therefore, in the illustrated embodiment, in the same third high wave 311, the distance J1 by which the center of the third outer arc segment 313a is offset relative to the center of the third inner arc segment 314a towards the third outer arc segment 313a is less than or equal to 0.08 mm. In the same third low wave 312, the distance J2 by which the center of the third outer arc segment 313b is offset relative to the center of the third inner arc segment 314b towards the third outer arc segment 313b is less than or equal to 0.08 mm.

[0224] Preferably, the distance J1 by which the center of the third outer arc segment 313a is offset relative to the center of the third inner arc segment 314a towards the third outer arc segment 313a is equal to the distance J2 by which the center of the third outer arc segment 313b is offset relative to the center of the third inner arc segment 314b towards the third outer arc segment 313b. In this way, not only is it convenient for processing, which is conducive to reducing the processing cost, but also it is conducive to the uniform expansion of the third wave unit 31, further ensuring the uniformity of the stent body 1000 after expansion.

[0225] Further, the distance J1 by which the center of the third outer arc segment 313a is offset relative to the center of the third inner arc segment 314a towards the third outer arc segment 313a is 0.04 mm, and the distance J2 by which the center of the third outer arc segment 313b is offset relative to the center of the third inner arc segment 314b towards the third outer arc segment 313b is also 0.04 mm. That is, the offset amount (J1 or J2) of the third wave unit 31 is 0.04 mm.

[0226] Since the offset amount of the third wave unit 31 is negatively correlated with the maximum stress of the third wave unit 31 in the expansion process, when the stent body 1000 is converted from the unexpanded state (the radial size is 2mm) to the expanded state (the radial size is 8mm) in the radial expansion process, the design of J1 and J2 being 0.04mm can effectively reduce the maximum stress of the corresponding third wave unit 31 in the expansion process, thereby reducing the stress deformation amount of each part of the third wave connection ring 30 of the stent body 1000 in the expansion process, and further ensuring the uniformity of the stent body 1000 after expansion. Moreover, compared with the scheme of the offset amount being 0.04mm to 0.08mm (not including 0.04mm), the scheme of the offset amount being 0.04mm not only has low processing cost and high processing benefit on the basis of ensuring the uniformity of the stent body 1000 after expansion, but also is conducive to the miniaturization design of the third wave unit 31, and further conducive to the miniaturization design of the stent body 1000.

[0227] Please refer to Figure 1 、 Figure 24 and Figure 25 In some embodiments, in the same third wave connection ring 30, the distance between the common tangent at the wave peak of the third high wave 311 of the plurality of third wave units 31 and the common tangent at the wave valley of the third low wave 312 of the third wave unit 31 in the axial direction is the second amplitude height.

[0228] In the present application, in the third wave unit 31, the "wave peak" refers to the third circular arc part 316a of the third high wave 311, and the common tangent at the wave peak of the third high wave 311 of the plurality of third wave units 31 refers to a straight line tangent to the third outer arc segment 313a of the third high wave 311 of the plurality of third wave units 31; in the third wave unit 31, the "wave valley" refers to the third circular arc part 316b of the third low wave 312, and the common tangent at the wave valley of the third low wave 312 of the plurality of third wave units 31 refers to a straight line tangent to the third outer arc segment 313b of the third low wave 312 of the plurality of third wave units 31. The same understanding can be made for "the wave peak of the third high wave 311 of the third wave unit 31" and "the wave valley of the third low wave 312 of the third wave unit 31" hereinafter, and will not be repeated.

[0229] It should be noted that, since the stent body 1000 is expanded radially, the third wave-shaped connecting ring 30 is expanded radially, and each third wave unit 31 of the third wave-shaped connecting ring 30 is unfolded along with the expansion of the third wave-shaped connecting ring 30, when the stent body 1000 is expanded radially, the first amplitude height of the stent body 1000 will decrease accordingly. That is, the second amplitude height K1 of the stent body 1000 in the expanded state is smaller than the second amplitude height K2 of the stent body 1000 in the unexpanded state. It can be understood that the greater the radial size of the stent body 1000 in the expanded state, the smaller the second amplitude height K1 of the stent body 1000.

[0230] In the illustrated embodiment, the second amplitude height K2 of the two third wave-shaped connecting rings 30 is equal. When the stent body 1000 is expanded radially, such a design is beneficial to ensure that the second amplitude height K1 of the two third wave-shaped connecting rings 30 after expansion is equal, and is beneficial to ensure the uniformity of the stent body 1000 after expansion.

[0231] Further, when the stent body 1000 is in the expanded state, the second amplitude height K1 ranges from 1.3 mm to 1.7 mm. In this way, when the stent body 1000 (as shown in FIG. 1) is expanded radially, the third wave-shaped connecting ring 30 can achieve a relatively uniform stress effect, ensuring the uniformity of the third wave-shaped connecting ring 30, and further ensuring the uniformity of the stent body 1000 after expansion. Figure 1

[0232] Preferably, when the stent body 1000 is in the expanded state, the second amplitude height K1 is 1.4 mm. Since the second amplitude height K1 of the third wave-shaped connecting ring 30 is positively correlated with the maximum stress of the third wave unit 31 of the third wave-shaped connecting ring 30 during unfolding, the design of the second amplitude height K1 being 1.4 mm, on the basis of being able to realize the conversion of the stent body 1000 from the unexpanded state (radial size of 2 mm) to the expanded state (radial size of 8 mm), can greatly reduce the maximum stress of the third wave unit 31 during unfolding, further reduce the stress deformation amount of the corresponding third wave-shaped connecting ring 30 during expansion, and further ensure the uniformity of the stent body 1000 after expansion. It can be understood that the above-mentioned third wave-shaped connecting ring 30 content can refer to the above-mentioned tensile simulation, and therefore will not be described again.

[0233] Please refer to Figure 1 , Figure 22 and Figure 26 ​In some embodiments, the second connecting rods 40 are curved rods, and each second connecting rod 40 comprises a second connecting segment 41 and a second extending segment 42. The second connecting segments 41 are at least two, one of which connects the third wave-shaped connecting ring 30, and the other of which connects the first wave-shaped connecting ring 110 axially adjacent to the third wave-shaped connecting ring 30. The second extending segment 42 is connected between the two second connecting segments 41 and is arc transitioned with the second connecting segments 41, and extends in the circumferential direction or obliquely to the circumferential direction.

[0234] In this way, the axially adjacent first wave-shaped connecting ring 110 and the third wave-shaped connecting ring 30 are fixedly connected through the second connecting rod 40, so that the axially adjacent third wave-shaped connecting ring 30 and the first wave-shaped connecting ring 11 can be fixedly connected through the second connecting rod 40 to form an integral whole, thereby ensuring the structural stability of the stent body 1000. Moreover, when the stent body 1000 is radially expanded, since the second extending segment 42 is arc transitioned with the second connecting segment 41, the deformation of the second connecting rod 40 can be prevented from being greatly deviated (for example, axially deviated), thereby ensuring the uniform deformation of the second connecting rod 40, ensuring the uniform stress of the first wave-shaped connecting ring 110 and the third wave-shaped connecting ring 30 connected thereto, and further ensuring the uniformity of the stent body 1000 after expansion.

[0235] Further, taking the center of the second connecting rod 40 as the symmetry origin, the two second connecting segments 41 are symmetrical about the origin (not labeled in the figure). In this way, when the stent body 1000 is radially expanded, the stress of the second connecting rod 40 is uniformly distributed, which is conducive to the uniform radial expansion of the stent body 1000, further ensures the uniformity of the stent body 1000 after expansion, and is also beautiful and simple.

[0236] In the illustrated embodiments, the number of second connecting rods 40 is thirty-two, and the thirty-two second connecting rods 40 comprise thirty second connecting rods 40a and two second connecting rods 40b. The two third wave-shaped connecting rings 30 and the first wave-shaped connecting rings 110 axially adjacent thereto are connected through fifteen second connecting rods 40a and one second connecting rod 40b, respectively. Among them, the structures of the thirty second connecting rods 40a are similar, and the structures of the two second connecting rods 40b are similar.

[0237] Hereinafter, the third wave-shaped connecting ring 30 located at the proximal end of the stent body 1000 and the first wave-shaped connecting ring 110 axially adjacent thereto connected through fifteen second connecting rods 40a and one second connecting rod 40b will be taken as an example for specific description.

[0238] The second connecting rod 40a includes two second connecting segments 41 and one second extension segment 42a. The two second connecting segments 41 are second connecting segment 41a and second connecting segment 41b. The second connecting segment 41a extends axially, and one end of the second connecting segment 41a is connected to and rounded with the third arc portion 316b of the third low wave 312 of a third waveform unit 31, and the other end is connected to and rounded with one end of the second extension segment 42a. The second extension segment 42a extends obliquely circumferentially. The other end of the second extension segment 42a is connected to and rounded with one end of the second connecting segment 41b. The second connecting segment 41b extends axially, and the other end of the second connecting segment 41b is connected to and rounded with the first arc portion 116a of the first high wave 111 of a first waveform unit 110 that is axially adjacent to the aforementioned third waveform unit 31. Both the second connecting segments 41a and 41b are symmetrical with respect to the center of the second extension segment 42a, that is, the center of the second extension segment 42a is the origin of the second connecting rod 40a.

[0239] The second connecting rod 40b includes two second connecting segments 41 and one second extension segment 42b. The two second connecting segments 41 are second connecting segment 41c and second connecting segment 41d. The second connecting segment 41c extends axially, and one end of the second connecting segment 41c is connected to the third arc portion 316b of the third low wave 312 of a third waveform unit 31 with an arc transition. The other end is connected to one end of the second extension segment 42b with an arc transition. The second extension segment 42b extends obliquely circumferentially. The other end of the second extension segment 42b is connected to one end of the second connecting segment 41d with an arc transition. The second connecting segment 41d extends axially, and the other end of the second connecting segment 41d is connected to the first wave rod 115c of the first low wave 112 of the first first waveform unit 110, wherein the first first waveform unit 110 is axially adjacent to the aforementioned third waveform unit 31. The second connecting segments 41c and 41d are symmetrical with respect to the center of the second extension segment 42b, that is, the center of the second extension segment 42b is the origin of the second connecting rod 40b.

[0240] It should be noted that "the first waveform unit 110" refers to the first waveform connecting ring 11 (e.g., Figure 1 (As shown) The first first waveform unit 110 is the first waveform unit 110 along its spiral direction from the proximal end to the distal end. Similarly, "the second first waveform unit 110," "the third first waveform unit 110," etc., can be understood in a similar way. Likewise, "the last first waveform unit 110" refers to the last first waveform unit 110 of the first waveform connecting ring 11 along its spiral direction from the proximal end to the distal end. Similarly, "the second to last first waveform unit 110," "the third to last first waveform unit 110," etc., can be understood in a similar way, and will not be elaborated further below.

[0241] The third wave-shaped connecting ring 30 is connected with the axially adjacent first wave-shaped connecting ring 11 to form an integral whole, thereby ensuring the structural stability of the stent body 1000 (as shown in Figure 1 When the stent body 1000 is radially expanded, on one hand, the deformation of the second connecting rod 40 (the second connecting rod 40a or the second connecting rod 40b) can be prevented from having a large axial deviation, thereby ensuring the uniform deformation of the second connecting rod 40, because of the arc transition between each second extension section 42 and the second connecting section 41 connected therewith. On the other hand, the stress distribution of each second connecting rod 40 can be ensured to be uniform, which is beneficial to the uniform expansion of the stent body 1000 along the radial direction, thereby further ensuring the uniformity of the stent body 1000 after expansion, and the design is also simple and elegant, because of the central symmetry of the second connecting section 41a and the second connecting section 41b relative to the second extension section 42a, and the central symmetry of the second connecting section 41c and the second connecting section 41d relative to the second extension section 42b.

[0242] In addition, it should be noted that after the stent body 1000 is radially expanded, each second connecting section 41 can still extend along the axial direction, and the extension direction does not change. In this way, the first arc portion 116a of the first wave-shaped unit 110 and the third arc portion 316b of the third wave-shaped unit 31 can be prevented from being subjected to a stress with a relative axial deviation, which can cause the first arc portion 116a and the third arc portion 316b to be subjected to a non-uniform stress, thereby being beneficial to the uniform expansion of the first wave-shaped unit 110 and the third wave-shaped unit 31, and being beneficial to the uniform expansion of the third wave-shaped connecting ring 30 and the axially adjacent first wave-shaped connecting ring 11, thereby further ensuring the uniformity of the stent body 1000 after expansion.

[0243] It can be understood that in the illustrated embodiment, the number of the second connecting sections 41 of each second connecting rod 40 is two. In other embodiments, the number of the second connecting sections 41 can also be three, four or more, and the present application does not limit the number of the second connecting sections 41. In other embodiments, the second extension section 42 (the second extension section 42a or the second extension section 42b) can also extend along the circumferential direction, and the second connecting section 41 (the second connecting section 41a, the second connecting section 41b, the second connecting section 41c or the second connecting section 41d) can also extend along an inclination to the axial direction.

[0244] In the illustrated embodiment, as shown in Figure 1 , Figure 3 , Figure 22 and Figure 25As shown, the third wave-shaped connecting ring 30 at the distal end of the stent body 1000 is connected to the first wave-shaped connecting ring 11 axially adjacent thereto by fifteen second connecting rods 40a and one second connecting rod 40b in a manner similar to the above-mentioned manner in which the third wave-shaped connecting ring 30 at the distal end of the stent body 1000 is connected to the first wave-shaped connecting ring 11 axially adjacent thereto by fifteen second connecting rods 40a and one second connecting rod 40b. The difference between the two is that, in the third wave-shaped connecting ring 30 at the distal end of the stent body 1000 and the first wave-shaped connecting ring 11 axially adjacent thereto, one second connecting segment 41 of the second connecting rod 40a is connected to the third circular arc portion 316b of the third low wave 312 of the third wave-shaped unit 31, and the other second connecting segment 41 is connected to the first circular arc portion 116a of the first high wave 111 of the first wave-shaped unit 110 axially adjacent thereto. One second connecting segment 41 of the second connecting rod 40b is connected to the third circular arc portion 316b of the third low wave 312 of the third wave-shaped unit 31, and the other second connecting segment 41 is connected to the first wave rod 115b of the first high wave 111 of the last first wave-shaped unit 110, wherein the last first wave-shaped unit 110 is axially adjacent to the third wave-shaped unit 31.

[0245] In other embodiments, the second connecting rod 40 can also be a straight rod, the second connecting rod 40 is connected to the third wave-shaped unit 31 and the first wave-shaped unit 110 axially adjacent to the third wave-shaped unit 31, the second connecting rod 40 extends along the axial direction of the third wave-shaped connecting ring 30, or the second connecting rod 40 extends along an inclination to the axial direction of the third wave-shaped connecting ring 30. Such a second connecting rod 40 has low processing difficulty, is easy to process, and has low processing cost. It should be noted that, in the present application, the axial direction of the third wave-shaped connecting ring 30 is parallel to the axial direction of the stent body 1000.

[0246] Further, please refer to Figure 1 , Figure 3 , Figure 22 and Figure 23 In some embodiments, in the axially adjacent third wave-shaped connecting ring 30 and the first wave-shaped connecting ring 11, the number of third wave-shaped units 31 of the third wave-shaped connecting ring 30 is less than the number of first wave-shaped units 110 of the first wave-shaped connecting ring 11, the common tangent at the wave trough (i.e., the third circular arc portion 316b) of the third low wave 312 of the plurality of third wave-shaped units 31 of the third wave-shaped connecting ring 30 extends in the circumferential direction; the common tangent of the wave crest (i.e., the first circular arc portion 116a) of the first high wave 111 of the plurality of first wave-shaped units 110 of the first wave-shaped connecting ring 11 extends in the circumferential direction; and the common tangent at the wave trough (i.e., the first circular arc portion 116a) of the first low wave 112 of the plurality of first wave-shaped units 110 of the first wave-shaped connecting ring 11 extends in the circumferential direction.

[0247] Since the third wave-shaped connecting ring 30 is a circumferential closed loop structure, the common tangent at the wave trough (i.e. the third circular arc portion 316b) of the third low wave 312 of all the third wave units 31 of the third wave-shaped connecting ring 30 extends in the circumferential direction, and the above-mentioned plurality of first wave units 110 and the plurality of third wave units 31 axially adjacent thereto can be parallelly butted by the plurality of second connecting rods 40. Such a design, on the basis that the axial length of the stent body 1000 does not change, greatly reduces the maximum axial length of the plurality of second connecting rods 40, avoids the axial length of the second connecting rod 40 being too long, causes the flexibility of the second connecting rod 40 to be poor, and ensures the stability of the connection between the third wave-shaped connecting ring 30 and the first wave-shaped connecting ring 11 axially adjacent thereto. Moreover, when the main body portion 10 is a tubular structure composed of a plurality of first wave-shaped connecting rings 11 arranged in a continuous spiral from end to end, such a design can also reduce the axial length of the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30, and further facilitate the reduction of the axial length of the main body portion 10, the reduction of the axial length of the stent body 1000, and the improvement of the flexibility of the stent body 1000, which is conducive to the miniaturization design of the stent body 1000. In addition, such a design has simple structure, low design difficulty, is easy to process, and is conducive to reducing the processing cost.

[0248] In the illustrated embodiment, in the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30 located at the proximal end of the stent body 1000, the common tangent at the wave crest (i.e. the first circular arc portion 116a) and the common tangent at the wave trough (the first circular arc portion 116b) of the first first wave unit 110 and the second first wave unit 110 both extend in the circumferential direction. The common tangent at the wave crest (i.e. the first circular arc portion 116a) and the common tangent at the wave trough (the first circular arc portion 116b) of the third first wave unit 110, the fourth first wave unit 110, the fifth first wave unit 110 and the sixth first wave unit 110 all extend in the circumferential direction. Thus, the above-mentioned six first wave units 110 and the six third wave units 31 axially adjacent thereto can be parallelly butted by the six second connecting rods 40. It can be understood that in other embodiments, the common tangent at the wave crest (i.e. the first circular arc portion 116a) and the common tangent at the wave trough (the first circular arc portion 116b) of more first wave units 110 can also extend in the circumferential direction, and the present application does not limit this.

[0249] It is to be noted that in the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30 located at the distal end of the stent body 1000, there are also six first wave units 110 parallelly butted with six third wave units 31 axially adjacent thereto through six second connecting rods 40. Specifically, the last first wave unit 110, the second last first wave unit 110, the third last first wave unit 110, the fourth last first wave unit 110, the fifth last first wave unit 110 and the sixth last first wave unit 110 are parallelly butted with the six third wave units 31, and details are not repeated here.

[0250] In the illustrated embodiment, the number of third wave units 31 of the two third wave-shaped connecting rings 30 located at the proximal end and the distal end of the stent body 1000 is sixteen. The number of first wave units 110 of the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30 located at the proximal end of the stent body 1000 is eighteen. The number of first wave units 110 of the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30 located at the distal end of the stent body 1000 is seventeen. In other embodiments, the number of third wave units 31 of the third wave-shaped connecting ring 30 can be three, four, etc.; the number of first wave units 110 of the first wave-shaped connecting ring 11 axially adjacent to the third wave-shaped connecting ring 30 can be two, three, etc., and the present application does not limit this.

[0251] It is to be noted that in the third wave-shaped connecting ring 30 and the first wave-shaped connecting ring 11 axially adjacent thereto, when a plurality of first wave units 110 are parallelly butted with a plurality of third wave units 31, the axial spacing between the first wave unit 110 parallelly butted with the third wave unit 31 and the first wave unit 110 axially adjacent thereto is reduced. It can be understood that if the first wave unit 110 parallelly butted with the third wave unit 31 and the first wave unit 110 axially adjacent thereto are connected by the first connecting rod 12, the axial dimension of the corresponding first connecting rod 12 will be smaller, and its structure will change accordingly.

[0252] For example, Figure 1 , Figure 8 , Figure 22 and Figure 27As shown, the plurality of first connecting rods 12 further comprises two first connecting rods 12b and two first connecting rods 12c. The first first wave-shaped unit 110 is connected with the first wave-shaped unit 110 axially adjacent thereto by a first connecting rod 12b; the fourth first wave-shaped unit 110 is connected with the first wave-shaped unit 110 axially adjacent thereto by a first connecting rod 12c; the last first wave-shaped unit 110 is connected with the first wave-shaped unit 110 axially adjacent thereto by a first connecting rod 12b; and the fourth last first wave-shaped unit 110 is connected with the first wave-shaped unit 110 axially adjacent thereto by a first connecting rod 12c. The first connecting rods 12b and 12c are not identical to the first connecting rod 12a.

[0253] Specifically, the first connecting rod 12b comprises two first connecting segments 121 and a first extending segment 122b. The two first connecting segments 121 are respectively a first connecting segment 121e and a first connecting segment 121f. The first connecting segment 121e extends obliquely to the axial direction, and one end of the first connecting segment 121e is connected to one end of the first extending segment 122b and is connected in a circular arc transition. The first extending segment 122b extends obliquely to the circumferential direction, and the other end of the first extending segment 122b is connected to one end of the first connecting segment 121f and is connected in a circular arc transition. The first connecting segment 121f extends along the axial direction.

[0254] In the first first wave-shaped unit 110 and the first wave-shaped unit 110 axially adjacent thereto, the other end of the first connecting segment 121e is connected to the side position of the first circular arc portion 116b of the first wave-shaped unit 110 and is connected in a circular arc transition. The other end of the first connecting segment 121f is connected to the middle position of the first circular arc portion 116a of the first wave-shaped unit 110 axially adjacent to the first wave-shaped unit 110 and is connected in a circular arc transition. In the last first wave-shaped unit 110 and the first wave-shaped unit 110 axially adjacent thereto, the other end of the first connecting segment 121e is connected to the side position of the first circular arc portion 116a of the last first wave-shaped unit 110 and is connected in a circular arc transition. The other end of the first connecting segment 121f is connected to the middle position of the first circular arc portion 116b of the first wave-shaped unit 110 axially adjacent to the last first wave-shaped unit 110 and is connected in a circular arc transition.

[0255] In this way, the first first wave-shaped unit 110 can be connected with the first wave-shaped unit 110 axially adjacent thereto by a first connecting rod 12b; and the last first wave-shaped unit 110 can be connected with the first wave-shaped unit 110 axially adjacent thereto by a first connecting rod 12b. Compared with the first connecting rod 12a, the axial dimension of the first connecting rod 12b designed in this way is smaller.

[0256] The first connecting rod 12c comprises three first connecting segments 121 and a first extending segment 122c. The three first connecting segments 121 are a first connecting segment 121g, a first connecting segment 121h and a first connecting segment 121i respectively. The first connecting segment 121g extends in the axial direction, one end of the first connecting segment 121g is connected with one end of the first connecting segment 121h and the connection is a circular arc transition. The first connecting segment 121h extends in the circumferential direction, the other end of the first connecting segment 121h is connected with one end of the first extending segment 122c and the connection is a circular arc transition. The first extending segment 122c extends in the oblique direction to the circumferential direction, the other end of the first extending segment 122c is connected with one end of the first connecting segment 121i and the connection is a circular arc transition. The first connecting segment 121i extends in the oblique direction to the axial direction.

[0257] In the fourth first wave-shaped unit 110 and the first wave-shaped unit 110 axially adjacent thereto, the other end of the first connecting segment 121g is connected with the middle position of the first circular arc portion 116b of the fourth first wave-shaped unit 110 and the connection is a circular arc transition. The other end of the first connecting segment 121i is connected with the side position of the first circular arc portion 116a of the first wave-shaped unit 110 axially adjacent to the fourth first wave-shaped unit 110 and the connection is a circular arc transition. In the fourth last first wave-shaped unit 110 and the first wave-shaped unit 110 axially adjacent thereto, the other end of the first connecting segment 121g is connected with the side position of the first circular arc portion 116a of the fourth last first wave-shaped unit 110 and the connection is a circular arc transition. The other end of the first connecting segment 121i is connected with the side position of the first circular arc portion 116b of the first wave-shaped unit 110 axially adjacent to the fourth last first wave-shaped unit 110 and the connection is a circular arc transition.

[0258] In this way, the fourth first wave-shaped unit 110 can be connected with the first wave-shaped unit 110 axially adjacent thereto through one first connecting rod 12c; the fourth last first wave-shaped unit 110 can be connected with the first wave-shaped unit 110 axially adjacent thereto through one first connecting rod 12c. Compared with the first connecting rod 12a, the axial dimension of the first connecting rod 12c designed in this way is smaller.

[0259] Please refer to Figure 22 to Figure 24In some embodiments, the third connecting rod 50 is a straight rod, one end of which is connected to the trough of the second wave unit 21 (i.e. the second circular arc portion 214b of the second low wave 212) and the other end of which is connected to the crest of the third wave unit 31 (i.e. the third circular arc portion 316a of the third high wave 311) in the axially adjacent second and third wave units 21 and 31. In this way, the axially adjacent second and third wave units 21 and 31 can be connected by the third connecting rod 50, so that the axially adjacent second and third wave connecting rings 20 and 30 are connected by the third connecting rod 50 to form an integral whole, thereby ensuring the structural stability of the stent body 1000. Moreover, the third connecting rod 50 is a straight rod, which is simple in structure, easy to process and low in processing cost.

[0260] In the illustrated embodiments, the third connecting rod 50 extends axially. When the stent body 1000 (as shown in Figure 1 ) is radially expanded, each third connecting rod 50 still extends axially, and its extension direction does not change. In this way, the third connecting rod 50 can avoid exerting a stress relative to the axial direction on the second circular arc portion 214b of the second wave unit 21 and the third circular arc portion 316a of the third wave unit 31, thereby preventing the second circular arc portion 214b and the third circular arc portion 316a from being unevenly stressed, which is conducive to the uniform expansion of the second wave unit 21 and the third wave unit 31, the uniform expansion of the second wave connecting ring 20 and the third wave connecting ring 30, and the further ensuring of the uniformity of the stent body 1000 after expansion. In other embodiments, the third connecting rod 50 can extend obliquely to the axial direction.

[0261] Please refer to Figure 9 , Figure 11 , Figure 12 , Figure 14 , Figure 15 , Figure 17 , Figure 19 , Figure 20 , Figure 28 and Figure 29 In some embodiments, the stent body 1000 further comprises a fourth connecting rod 60, which connects the second wave connecting ring 20 and the first wave connecting ring 11 axially adjacent to the second wave connecting ring 20. In this way, the second wave connecting ring 20 can be connected to the main body portion 10 by the fourth connecting rod 60 to form an integral whole, and the structure is stable. That is, the third wave connecting ring 30 (as shown in Figure 1 ) of the stent body 1000 can be omitted.

[0262] Specifically, the fourth connecting rod 60 is connected between the axially adjacent second wave-shaped unit 21 and the first wave-shaped unit 110. In this way, the axially adjacent second wave-shaped unit 21 and the first wave-shaped unit 110 are connected by the fourth connecting rod 60, so that the axially adjacent second wave-shaped connecting ring 20 and the first wave-shaped connecting ring 11 can be connected by the fourth connecting rod 60 to form a whole, thereby ensuring the structural stability of the support body 1000.

[0263] In the description of the present specification, the description referring to the terms "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0264] The above is the embodiment of the embodiment of the present application. It should be pointed out that for those skilled in the art, without departing from the principle of the embodiment of the present application, a number of improvements and refinements can be made, which are also considered to be within the scope of protection of the present application.

Claims

1. A stent body, characterized by, The stent body comprises a main body part, the main body part comprises at least one first wave-shaped connecting ring arranged in an axial direction and a first connecting rod, the first wave-shaped connecting ring comprises a plurality of first wave-shaped units connected in a circumferential direction, every two first wave-shaped units arranged in an axial direction are connected by the first connecting rod, and the first connecting rod is provided in a plurality of forms and arranged in a circumferential direction in a spaced manner. The first wave-shaped unit comprises: a first high wave, wherein the first high wave is close to a proximal end of the first wave-shaped unit and protrudes towards a proximal end of the stent body; and a first low wave, wherein one end of the first low wave in one of the first wave-shaped units is connected to one end of the first high wave of the first wave-shaped unit, the other end of the first low wave is connected to the first high wave of another first wave-shaped unit, the first low wave is close to a distal end of the first wave-shaped unit and protrudes towards a distal end of the stent body. The first high wave and the first low wave each comprise a first outer circular arc segment and a first inner circular arc segment arranged in an axial direction, the first outer circular arc segment of the first high wave is closer to the proximal end of the stent body than the first inner circular arc segment of the first high wave, the first outer circular arc segment of the first low wave is closer to the distal end of the stent body than the first inner circular arc segment of the first low wave, and in the same first high wave or the same first low wave, the center of the first outer circular arc segment of the first high wave and / or the first low wave is offset to the first outer circular arc segment relative to the center of the first inner circular arc segment. The first high wave and the first low wave each further comprise a first circular arc part and two connected first wave rods, the first circular arc part of the first high wave is connected between the proximal ends of the two first wave rods of the first high wave, the first circular arc part of the first low wave is connected between the distal ends of the two first wave rods of the first low wave, and each first connecting rod axially shields at least one first circular arc part.

2. The stent body of claim 1, wherein, In one first wave-shaped unit, one first wave rod of the first high wave is connected to one first wave rod of the first low wave. In the same first high wave or the same first low wave, the included angle between the tangents of the two first wave rods ranges from 30° to 120°.

3. The stent body of claim 2, wherein, In the same first high wave, the distance by which the center of the first outer circular arc segment is offset to the first outer circular arc segment relative to the center of the first inner circular arc segment is less than or equal to 2 / 3 of the radial width of the first wave rod; and / or In the same first low wave, the distance by which the center of the first outer circular arc segment is offset to the first outer circular arc segment relative to the center of the first inner circular arc segment is less than or equal to 2 / 3 of the outer diameter of the first wave rod.

4. The stent body of claim 1, wherein, In the same first wave-shaped connecting ring, the distance in an axial direction between the common tangent at the wave peak of the first high wave of the plurality of first wave-shaped units and the common tangent at the wave valley of the first low wave of the plurality of first wave-shaped units is a first amplitude height, and the first amplitude height ranges from 1.3 mm to 1.7 mm.

5. The stent body of claim 1, wherein, The first wave-shaped connecting ring is a circumferential open ring structure, and a plurality of the first wave-shaped connecting rings are arranged in a continuous spiral manner to form a tubular structure.

6. The stent body of claim 1, wherein, The first wave-shaped connecting ring is a circumferential closed loop structure, and each two of the first wave-shaped connecting rings axially adjacent are connected by the first connecting rod.

7. The stent body of claim 1 or 6, wherein, The first connecting rod is a bent rod, and the first connecting rod comprises: a first connecting segment, at least two, in two of the first wave-shaped units axially adjacent, wherein one of the first connecting segments is connected to a wave trough of one of the first wave-shaped units, and the other of the first connecting segments is connected to a wave crest of the other of the first wave-shaped units; and a first extension segment connected between the two first connecting segments and circularly arcuate transitioned with the first connecting segments, the first extension segment extending circumferentially or obliquely to the circumferential direction.

8. The stent body of claim 7, wherein, With the center of the first connecting rod as a symmetric origin, the two first connecting segments are symmetric about the origin.

9. The stent body of claim 1 or 6, wherein, The first connecting rod is a straight rod.

10. The stent body of claim 1, wherein, The stent body further comprises second wave-shaped connecting rings respectively arranged at axially opposite ends of the main body part, and the second wave-shaped connecting rings comprise a plurality of second wave-shaped units connected along the circumferential direction.

11. The stent body of claim 10, wherein, The thickness of the second wave-shaped unit in the radial direction gradually increases in the axial direction of the stent body away from the main body part.

12. The stent body of claim 10, wherein, The stent body further comprises: a third wave-shaped connecting ring connected between the second wave-shaped connecting ring and the first wave-shaped connecting ring, the third wave-shaped connecting ring comprising a plurality of third wave-shaped units connected along the circumferential direction, the third wave-shaped connecting ring being a circumferential closed loop structure; a second connecting rod connecting the third wave-shaped connecting ring and the first wave-shaped connecting ring axially adjacent to the third wave-shaped connecting ring; and a third connecting rod connecting the third wave-shaped connecting ring and the second wave-shaped connecting ring axially adjacent to the third wave-shaped connecting ring.

13. The stent body of claim 12, wherein, The third wave-shaped unit comprises: a third high wave, the third high wave being close to the second wave-shaped connecting ring and protruding towards the second wave-shaped connecting ring; and a third low wave, one end of the third low wave in one of the third wave-shaped units, one end of the third high wave connecting the third wave-shaped unit, the other end of the third low wave connecting the third high wave of another third wave-shaped unit, the third low wave being close to the first wave-shaped connecting ring and protruding towards the first wave-shaped connecting ring; wherein the third high wave and the third low wave each comprise a third outer arc segment and a third inner arc segment arranged along the axial direction, the third outer arc segment of the third high wave being closer to the second wave-shaped connecting ring than the third inner arc segment of the third high wave, the third outer arc segment of the third low wave being closer to the first wave-shaped connecting ring than the third inner arc segment of the third low wave, and in the same third high wave or third low wave, the center of the third outer arc segment of the third high wave and / or the third low wave is offset to the third outer arc segment relative to the center of the third inner arc segment.

14. The stent body of claim 13, wherein, The second connecting rod connects the third wave-shaped unit and the first wave-shaped unit axially adjacent to the third wave-shaped unit, the second connecting rod being a straight rod, the second connecting rod extending circumferentially or obliquely to the circumferential direction.

15. The stent body of claim 13, wherein, The second connecting rod is a bent rod, and the second connecting rod comprises: two second connection segments, one of which connects a third wave-shaped unit, and the other of which connects a first wave-shaped unit axially adjacent to the third wave-shaped unit; and a second extension segment connected between the two second connection segments and connected with the second connection segments in a circular arc transition, the second extension segment extending in a circumferential direction or extending in an inclination to the circumferential direction.

16. The stent body of claim 15, wherein, The two second connection segments are symmetrical about a center of the second connection rod as a symmetrical origin.

17. The stent body of claim 13, wherein, In the third wave-shaped connection ring and the first wave-shaped connection ring axially adjacent to each other, the number of third wave-shaped units of the third wave-shaped connection ring is less than the number of first wave-shaped units of the first wave-shaped connection ring, and a common tangent at a wave trough of a third low wave of the plurality of third wave-shaped units of the third wave-shaped connection ring extends in a circumferential direction; a common tangent at a wave peak of a third high wave of the plurality of first wave-shaped units of the first wave-shaped connection ring extends in a circumferential direction, and a common tangent at a wave trough of a third low wave of the plurality of first wave-shaped units of the first wave-shaped connection ring extends in a circumferential direction.

18. The stent body of claim 13, wherein, The third high wave and the third low wave comprise two connected third wave rods, and in one third wave-shaped unit, one of the third wave rods of the third high wave connects one of the third wave rods of the third low wave. In the same third high wave or the same third low wave, the included angle between the tangents of the two third wave rods ranges from 30° to 120°.

19. The stent body of claim 18, wherein, In the same third high wave, the center of the third outer circular arc segment is offset from the center of the third inner circular arc segment to the third outer circular arc segment by a distance less than or equal to 2 / 3 of the radial width of the third wave rod; and / or In the same third low wave, the center of the third outer circular arc segment is offset from the center of the third inner circular arc segment to the third outer circular arc segment by a distance less than or equal to 2 / 3 of the radial width of the third wave rod.

20. The stent body of claim 13, wherein, In the same third wave-shaped connection ring, the distance in an axial direction between the common tangent at the wave peak of the third high wave of the plurality of third wave-shaped units and the common tangent at the wave trough of the third low wave of the third wave-shaped unit is a second amplitude height, and the second amplitude height ranges from 1.3 mm to 1.7 mm.

21. A covered stent, comprising: The stent body according to any one of claims 1 to 20; The stent body according to any one of claims 1 to 20; and The covering film connected to the stent body. The covering film is attached to the inner circumferential surface and / or the outer circumferential surface of the stent body.

22. The stent graft of claim 21, wherein, The covering film has multiple layers, and the stent body is located between any two layers of the covering film.

23. The stent graft of claim 21, wherein, ​

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