Covered stent and conveying system

Abstract

The invention provides a covered stent and a delivery system.The covered stent comprises a covered body, a first wave ring and a connecting part, and the covered body comprises an end section with an open end; the first wave ring is connected with the end part section; the connecting part is formed on at least one of the end part section and the first wave ring and is used for being connected with a conveyor; the end face of the end section comprises a first part end face and a second part end face which are connected with each other, and the first part end face and the second part end face are arranged in the circumferential direction of the film covering body; compared with the second part end face, the first part end face protrudes in the direction away from the covered stent, and an outwards-protruding area is formed between the face where the second part end face is located or the face where the section, farthest from the main body section, of the second part end face in the direction perpendicular to the axial direction of the covered stent is located and the first part end face in the axial direction. The connecting part is at least partially arranged in the outwards-protruding area, and the axial area of the connecting part is located in the axial area of the end portion section. According to the covered stent and the conveying system, the adherence and the blocking effect of the covered stent can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a covered stent and a delivery system. Background Art

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

[0003] Traditional open surgery for treating aortic aneurysm and aortic dissection has the disadvantages of large trauma, high mortality, long operation time, high incidence of postoperative complications and high operation difficulty. Endovascular treatment surgery has the characteristics of small trauma, few postoperative complications, short operation time and low operation difficulty, and has gradually become the main method for treating aortic aneurysm and aortic dissection at present. In endovascular treatment surgery, a covered stent is implanted into the aorta through a delivery device, isolating the vascular lesion outside the covered stent and restricting blood flow to flow through the inside of the covered stent, so as to achieve the purpose of protecting the blood vessel.

[0004] However, in the covered stent in the related art, the exposed part of the bare wave ring is exposed outside the proximal end of the covering film of the covered stent, and the proximal end of the covering film of the covered stent is flush. The exposed part of the bare wave ring is used to connect with the anchor of the delivery device to relatively fix the covered stent to the delivery device. For the covered stent with this structure, the exposed part of the bare wave ring is pulled by the anchor of the delivery device, which easily causes an incompletely reversible change in the relative position between the exposed part of the bare wave ring and the proximal end of the covering film of the covered stent when the covered stent is compressed in the delivery device. Furthermore, the relative position between the exposed part of the bare wave ring and the proximal end of the covering film of the covered stent cannot be completely restored when the delivery device releases the covered stent, making it difficult for the proximal end of the covered stent to fit well with the blood vessel wall, resulting in poor wall attachment, reducing the occlusion effect of the covered stent, and even prone to endoleakage, increasing the surgical risk. Summary of the Invention

[0005] The present invention provides a covered stent and a delivery system, aiming to improve the wall attachment and occlusion effect of the covered stent, avoid endoleakage, and at the same time be able to select a sheath tube with a smaller diameter that matches the covered stent.

[0006] An embodiment of the present invention provides a covered stent, including:

[0007] A covering body, including an end portion section having an open end portion and a main body section connected to the end portion section;

[0008] A first wave ring, connected to the end portion section and relatively fixed to the end portion section;

[0009] A connecting part is formed on at least one of the end part section and the first corrugated loop for connecting with a conveyor.

[0010] Wherein, the end face of the end part section includes a first partial end face and a second partial end face which are connected to each other, and the first partial end face and the second partial end face are arranged along the circumferential direction of the film covering body; compared with the second partial end face, the first partial end face protrudes in a direction away from the main body section, and an outward convex area is formed between the plane where the second partial end face is located or the plane of the section of the second partial end face that is farthest from the main body section in the direction perpendicular to the axial direction of the film covering bracket and the first partial end face, and at least the end away from the main body section of the connecting part is arranged in the outward convex area, so as to drive the outward convex area to be positioned on the conveyor.

[0011] In the film covering bracket of the embodiment of the present invention, the connecting part is located in the outward convex area.

[0012] In the film covering bracket of the embodiment of the present invention, the first corrugated loop includes a first wave and a second wave, the wave crest of the first wave protrudes more in a direction away from the main body section than the wave crest of the second wave, and the wave crest of the first wave is located in the outward convex area.

[0013] In the film covering bracket of the embodiment of the present invention, the wave crest of the second wave is adjacent to or located on the second partial end face.

[0014] In the film covering bracket of the embodiment of the present invention, the connecting part includes a connecting wire or a connecting belt, and the connecting wire or the connecting belt is connected to at least one of the end part section and the first corrugated loop; alternatively, the connecting part includes a connecting hole or a connecting slit, and the connecting hole or the connecting slit penetrates through the end part section.

[0015] In the film covering bracket of the embodiment of the present invention, the connecting part includes a connecting film, a part of the first corrugated loop is arranged between the end part section and the connecting film, and an insertion opening is arranged between the end part section and the connecting film, and the insertion opening is used for inserting the conveyor and connecting with the conveyor.

[0016] In the film covering bracket of the embodiment of the present invention, the connecting film and the end part section are of an integral structure.

[0017] In the film covering bracket of the embodiment of the present invention, the connecting film is made of a material with a developing function.

[0018] In the film covering bracket of the embodiment of the present invention, the connecting part includes a first end away from the main body section and a second end close to the main body section, and the first end is closer to the longitudinal central axis of the film covering bracket than the second end.

[0019] In the covered stent according to an embodiment of the present invention, the number of end faces of the first part includes at least two, and the plurality of end faces of the first part are arranged at intervals in the circumferential direction.

[0020] In the covered stent according to an embodiment of the present invention, when the connecting portion includes a connecting hole or a connecting seam, the covered stent further includes a second corrugated ring, the second corrugated ring is connected to the end portion section, and one of the wave crests of the second corrugated ring is arranged adjacent to the connecting hole or the connecting seam.

[0021] In the covered stent according to an embodiment of the present invention, the first corrugated ring includes a first corrugated section and a second corrugated section, the radial support strength of the first corrugated section is less than that of the second corrugated section, the area where the end portion section is located on the covered stent is a first area, and the covered stent further includes:

[0022] A balance structure, arranged in the first area, for increasing the radial support strength of the area in the first area that is coaxial with the first corrugated section.

[0023] An embodiment of the present invention further provides a delivery system, including:

[0024] A delivery device; and

[0025] The covered stent according to any one of the above, wherein the delivery device is used to deliver the covered stent.

[0026] The covered stent and delivery system provided by the embodiments of the present invention, since the first wave ring is connected to and relatively fixed with the end section, the first wave ring and the end section form an integral body. The connecting part is formed on at least one of the end section and the first wave ring, that is, the connecting part is connected to the integral body of the end section and the first wave ring. At this time, the part connected to the delivery device is the connecting part, and the delivery device is connected to the integral body of the end section and the first wave ring through the connecting part, which can buffer the acting force of the relative displacement between the delivery device and the first wave ring and the end section, keep the relative position between the first wave ring and the end section unchanged, so as to ensure that the end section and the first wave ring of the covered stent can better maintain their shapes after the covered stent is released, enable the covered stent to better fit the inner wall of the blood vessel, ensure the wall attachment property of the covered stent, thereby improve the occlusion effect of the covered stent, avoid endoleakage, and reduce the surgical risk. At the same time, on the basis of the above, an outward convex area is set, and at least one end of the connecting part far from the main body section is arranged in the outward convex area. Compared with the setting where the covered film end is flush, when the fixing part on the outward convex area is connected to the anchoring part of the delivery device, the outward convex area is driven to be positioned on the anchoring part of the delivery device, so that the outward convex area forms a relatively tight contact with the anchoring part, and the rest of the end section can be axially misaligned with the outward convex area, making the radial compression diameter at the proximal anchor connection with the delivery device smaller, so that a sheath tube with a smaller diameter can be selected. In addition, the part connected or positioned at the proximal anchor of the delivery device is less, which can reduce the unnecessary interference generated during the assembly and release of the covered stent at the anchoring part of the delivery device.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the disclosure of the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 is a schematic structural diagram of a delivery system provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic structural diagram of a covered stent provided by an embodiment of the present invention;

[0031] Figure 3 is a partial structural diagram of a covered stent provided by an embodiment of the present invention;

[0032] Figure 4 is a partial structural diagram of a covered stent provided by an embodiment of the present invention;

[0033] Figure 5 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0034] Figure 6 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0035] Figure 7 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0036] Figure 8 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0037] Figure 9 It is a schematic diagram of the position of the connecting part provided by an embodiment of the present invention;

[0038] Figure 10 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0039] Figure 11 It is a schematic diagram of the position of the connecting part provided by an embodiment of the present invention;

[0040] Figure 12 It is a schematic diagram of the position of the connecting part provided by an embodiment of the present invention and an enlarged view of part A therein.

[0041] Figure 13 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0042] Figure 14 It is a partial structural schematic diagram of a covered stent provided by an embodiment of the present invention;

[0043] Figure 15 It is a partial structural schematic diagram of the end section after expansion provided by an embodiment of the present invention;

[0044] Figure 16 It is a partial structural schematic diagram of the end section after expansion provided by an embodiment of the present invention;

[0045] Figure 17 It is a partial structural schematic diagram of the end section after expansion provided by an embodiment of the present invention;

[0046] Figure 18 It is a partial structural schematic diagram of the end section after expansion provided by an embodiment of the present invention;

[0047] Figure 19 It is a partial structural schematic diagram of the end section after expansion provided by an embodiment of the present invention;

[0048] Figure 20It is a partial structural schematic diagram after the end section of an embodiment of the present invention is unfolded;

[0049] Figure 21 It is a partial structural schematic diagram after the end section of an embodiment of the present invention is unfolded.

[0050] Explanation of reference numerals:

[0051] 1000, conveying system;

[0052] 100, covered stent; 100a, first region;

[0053] 10, covered body; 11, end section; 111, open end; 1111, proximal open end; 1112, distal open end; 112, end face; 1121, first part of the end face; 1122, second part of the end face; 11a, convex region; 12, main body section;

[0054] 20, first wave ring; 21, first waveform section; 21a, first wave; 211, first wave rod; 212, second wave rod; 213, first wave peak; 22, second waveform section; 22a, second wave; 221, third wave rod; 222, fourth wave rod; 223, second wave peak; 2011, part of the first wave ring 20 that is at least partially exposed outside the covered body 10 along the axis;

[0055] 30, support skeleton;

[0056] 40, connecting part; 41, connecting wire; 42, connecting band; 43, connecting hole; 44, connecting seam; 441, open end of the connecting seam; 45, connecting film; 450, insertion opening; 451, suture;

[0057] 50, balance structure; 51, second wave ring; 511, third wave; 5111, fifth wave rod; 5112, sixth wave rod; 5113, third wave peak; 512, fourth wave; 5121, seventh wave rod; 5122, eighth wave rod; 5123, fourth wave peak; 52, third wave ring; 53, closed structure; 54, fourth wave ring;

[0058] 61, first intersection point; 62, second intersection point;

[0059] 200, conveyor; 201, sheath; 202, sheath core; 203, anchor. Detailed implementation manners

[0060] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0062] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0063] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0064] Next, some embodiments of the present invention will be described in detail in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0065] For the convenience of description, the terms "proximal end" and "distal end" are defined herein as common terms in the field of interventional medicine. Specifically, the "distal end" represents the end where blood flows out, and the "proximal end" represents the end where blood flows in. For example, after the covered stent is implanted into the lumen, blood flows from the proximal end to the distal end of the covered stent; the "axial direction" represents its length direction, or the direction in which the interventional device is advanced and withdrawn; the "radial direction" represents the direction perpendicular to the "axial direction".

[0066] Taking a blood vessel as an example to illustrate the lumen, the blood vessel may include, but is not limited to, at least one of the following: ascending aorta, aortic arch, descending aorta, thoracic aorta, abdominal aorta, venous vessel, etc. Those of ordinary skill in the art should be aware that using a blood vessel for illustration is only for example and does not limit the present invention. The solution of the present invention is applicable to various human lumens or animal lumens. For example, human lumens may include digestive tract lumens or blood vessels, etc. All kinds of improvements and deformations based on the teachings of the present invention are within the protection scope of the present invention.

[0067] The "wave loop" in the embodiments of the present invention is a closed or non-closed waveform ring structure, which can also be called a waveform ring structure. It can be provided on the inner wall and / or outer wall of the film body of the covered stent. The wave loop and the film body are connected by at least one of the following connection methods: suturing, bonding, hot melting, etc. Exemplarily, at least part of the wave loop can be made of a material with good tensile, resilience performance and good biocompatibility. For example, the material includes at least one of the following: known materials implanted in medical devices, various biocompatible materials, such as alloys of two or more single metals among cobalt, chromium, nickel, titanium, magnesium, iron, stainless steel or nickel-titanium-tantalum alloy, etc., or other elastic materials with biocompatibility. The wave loop has radial expansion ability, can be radially contracted under the action of external force, and self-expand or expand mechanically (for example, expand by balloon dilation) to restore to the initial shape and maintain the initial shape after the external force is withdrawn. Thus, after being implanted into the lumen, it can closely adhere to the inner wall of the lumen through its radial supporting force. The waveform of the wave loop is not limited, for example, it includes at least one of the following: Z-shaped wave, M-shaped wave, V-shaped wave, sine wave, etc. The wave loop includes a plurality of wave peaks (also called proximal vertices), a plurality of wave valleys (also called distal vertices), and wave rods connecting adjacent wave peaks and wave valleys. Among them, one vertex (proximal vertex or distal vertex) and the two wave rods connected to the vertex form a wave.

[0068] It can be understood that the "number of waves" referred to in the embodiments of the present invention refers to the number of wave peaks or wave valleys. The "wave height" refers to the vertical distance between a wave peak and the adjacent shortest wave valley. The "wave angle" refers to the included angle between two adjacent wave rods connecting the same vertex.

[0069] It can be understood that the radial supporting force (unit: N) can be measured by a radial supporting force tester, such as the radial supporting force tester of model RX550-100 of Machine Solution Inc (MSI). Taking the first wave loop as an example, place the first wave loop in the radial gripper of the tester. During the test, always keep the radial gripper evenly radially compress the first wave loop until the first wave loop is compressed to 20% of its original diameter, and measure the value of the radial supporting force of the first wave loop at this moment.

[0070] The radial supporting force of the first wave of the first wave loop can be measured to be less than that of the second wave of the first wave loop in the following way: fabricate a first test wave loop composed of multiple first waves, with the diameter of the first test wave loop being the same as that of the first wave loop; fabricate a second test wave loop composed of multiple second waves, with the diameter of the second test wave loop being the same as that of the first wave loop; respectively test the radial supporting forces of the first test wave loop and the second test wave loop, and it is obtained that the radial supporting force of the first test wave loop is less than that of the second test wave loop. Since both the first wave and the second wave are on the first wave loop and the maximum axial length of the first wave loop is the same value, it can be further calculated that the radial supporting force of the first wave of the first wave loop is less than that of the second wave of the first wave loop.

[0071] In the embodiments of the present invention, the radial supporting strength (unit: Pa) mentioned can be calculated by the following formula: radial supporting strength = radial supporting force ÷ maximum axial length of the measured position. It can be understood that when there are multiple wave loops axially arranged at the measured position and the multiple wave loops are arranged closer axially, the radial supporting strength is greater.

[0072] It should be noted that A equals B means that A equals B within the range of assembly and / or installation errors, or A is approximately equal to B.

[0073] Please refer to Figure 1 , the embodiments of the present invention provide a conveying system 1000, including a film-covered stent 100 and a conveyor 200. The conveyor 200 is used to convey the film-covered stent 100 to convey the film-covered stent 100 to the blood vessel lesion position, so as to isolate the blood vessel lesion outside the film-covered stent 100, thereby achieving the purpose of protecting the blood vessel.

[0074] Please refer to Figure 1 , in some embodiments, the conveyor 200 includes a sheath core 201 and a sheath 202. The sheath core 201 penetrates through the sheath 202, and the sheath 202 can accommodate and convey the film-covered stent 100. When it is necessary to convey the film-covered stent 100 to the blood vessel lesion position, the film-covered stent 100 can be first connected to the anchor 203 of the conveyor 200, and the film-covered stent 100 is compressed and loaded between the sheath 202 and the sheath core 201 to facilitate the conveyance of the film-covered stent 100.

[0075] It can be understood that the film-covered stent 100 can be radially compressed and loaded into the sheath 202 of the conveyor 200. After the film-covered stent 100 is implanted into the lesion position through the conveyor 200, the film-covered stent 100 can isolate the blood flow from the lesion position, eliminate the influence of blood pressure on the lesion position, so as to achieve the purpose of cure.

[0076] Please refer to Figure 2, in some embodiments, the covered stent 100 includes a covered body 10 and a first corrugated ring 20. The covered body 10 includes an end segment 11 having an open end 111; the first corrugated ring 20 is connected to the end segment 11 and is relatively fixed to the end segment 11. Understandably, the covered body 10 includes a hollow tubular structure, and the hollow cavity of the covered body 10 constitutes a blood flow channel.

[0077] Please refer to Figure 2 , in some embodiments, the covered body 10 has at least one proximal open end 1111 and one distal open end 1112. The first corrugated ring 20 can be disposed on the end segment 11 where the proximal open end 1111 of the covered body 10 is located according to actual needs, or on the end segment 11 where the distal open end 1112 is located, or simultaneously disposed on the end segments 11 at both ends of the covered body 10. Exemplarily, the first corrugated ring 20 is disposed on the proximal open end 1111 of the covered body 10.

[0078] Please refer to Figure 2 , in some embodiments, the covered body 10 further includes a main body segment 12, the covered stent 100 further includes a support framework 30, and the end segment 11 is connected to the main body segment 12; the support framework 30 is connected to the main body segment 12, and the support framework 30 is used to support the main body segment 12. The end segment 11 is located at the proximal end of the main body segment 12, or the end segment 11 is located at the distal end of the main body segment 12. The support framework 30 has a radial expansion ability, which can be radially contracted under an external force and self-expand to restore to its initial shape and maintain its initial shape after the external force is withdrawn. Thus, after being implanted into a blood vessel, it can closely adhere to the inner wall of the blood vessel through its radial supporting force. Exemplarily, the main body segment 12 includes a main body covering film in a tubular shape, and the support framework 30 includes at least one support corrugated ring.

[0079] Exemplarily, both the main body covering film and the end covering film can be a single-layer structure or a multi-layer structure, which is not limited herein. Both the main body covering film and the end covering film can be made of at least one of the following materials: polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), other high-molecular materials with good biocompatibility, etc. The main body covering film can be fixed to the inner surface and / or outer surface of the support framework 30 by means of sewing, bonding, hot melting, etc., so as to play roles such as reconstructing a fluid channel and isolating a diseased area of the blood vessel.

[0080] Exemplarily, the axial region of the end segment 11 is as shown by A1 in Figure 2 , and the axial region of the main body segment 12 is as shown by B in Figure 2 .

[0081] In some embodiments, the end segment 11 includes a tubular end film, and the open end 111 of the end segment 11 can be enclosed by the edge or end face 112 of the end film (please refer to Figure 3 ). Exemplarily, an end support assembly is provided on the end segment 11, and the end film can be fixed to the inner surface and / or outer surface of the end support assembly by means of stitching, bonding, hot melting, etc. Among them, the end support assembly includes a first corrugated ring 20 connected to the end segment 11. In other embodiments, the end support assembly further includes other corrugated rings connected to the end segment 11 to further increase the radial anchoring force of the film body 10 and further improve the stability during the use of the film-covered stent 100.

[0082] In some embodiments, the end segment 11 is capable of switching between a first state and a second state. The radial dimension of the end segment 11 in the first state is smaller than that in the second state. The second state can be a natural deployment state, that is, a natural stretching state without being affected by artificial external forces; it can also be a state of being radially compressed to a certain extent and not fully deployed. Regardless of which state, its radial dimension is larger than that in the first state. Please refer to Figure 3 . When the end segment 11 is in the second state, the first corrugated ring 20 is located inside the end segment 11, and at this time, the axial region A2 of the first corrugated ring 20 is located inside the axial region A1 where the end segment 11 is located.

[0083] Please refer to Figure 3 and Figure 4 . In some embodiments, the film-covered stent 100 further includes a connecting portion 40, and the connecting portion 40 is formed on at least one of the end segment 11 and the first corrugated ring 20. The connecting portion 40 is used to connect with the conveyor 200. Among them, the end face 112 of the end segment 11 includes a first partial end face 1121 and a second partial end face 1122 that are connected to each other. The first partial end face 1121 and the second partial end face 1122 are arranged along the circumferential direction of the film body 10; compared with the second partial end face 1122, the first partial end face 1121 protrudes away from the main body segment 12, that is, protrudes outward. An outer convex region 11a is formed between the plane where the second partial end face 1122 is located and the first partial end face 1121. At least the end of the connecting portion 40 away from the main body segment 12 is arranged in the outer convex region 11a for driving the outer convex region 11a to be positioned on the conveyor 200. At this time, the plane where the second partial end face 1122 is located is a flat surface.

[0084] In this embodiment, since the first corrugated ring 20 is connected to the end portion 11 and relatively fixed to the end portion 11, the first corrugated ring 20 and the end portion 11 form an integral body. The connecting portion 40 is formed on at least one of the end portion 11 and the first corrugated ring 20, that is, the connecting portion 40 is connected to the integral body of the end portion 11 and the first corrugated ring 20. At this time, the connecting portion 40 is connected to the conveyor 200, and the conveyor 200 is connected to the integral body of the end portion 11 and the first corrugated ring 20 through the connecting portion 40, which can buffer the acting force of the relative displacement between the conveyor 200 and the first corrugated ring 20 and the end portion 11, so that the relative position between the first corrugated ring 20 and the end portion 11 can remain unchanged, thereby ensuring that the end portion 11 and the first corrugated ring 20 of the covered stent 100 can better maintain their shapes after the covered stent 100 is released, enabling the covered stent 100 to better fit the inner wall of the blood vessel, ensuring the wall attachment of the covered stent 100, and further improving the occlusion effect of the covered stent 100, avoiding endoleakage, and reducing the surgical risk.

[0085] Meanwhile, on the basis of ensuring the wall attachment, the covered stent 100 of this embodiment can be compressed in the loaded state and connected and fixed to the anchor 203 of the conveyor 200 through the connecting portion 40. The connecting portion 40 is connected to the anchor 203, and at least the end far from the main body section 12 in the connecting portion 40 is disposed in the convex region 11a, so as to be able to drive the convex region 11a to be positioned on the anchor 203 to form a relatively close contact. Compared with the end face 112 of the covered stent 100 being a plane, the convex region 11a is a region axially enclosed by the plane of the second part end face 1122 and the first part end face 1121. The remaining part of the covered stent 100 can be at least partially axially offset from the connecting portion 40 or the convex region 11a, so that the radial compression diameter of the part of the covered stent 100 connected to the anchor 203 is smaller, facilitating the loading of the covered stent 100 into the sheath 201 with a smaller diameter, and further facilitating the conveyor 200 to convey the covered stent 100 to the lesion site; in addition, the part of the covered stent 100 connected to the anchor 203 is less, which can reduce unnecessary interference between the covered stent 100 and the anchor 203 of the conveyor 200 during assembly and / or release, improve the assembly efficiency and / or release efficiency, and reduce damage to the covered stent 100 and / or the conveyor 200.

[0086] Please refer to Figure 3, in some embodiments, the first corrugated ring 20 is located within the end segment 11. At this time, the axial region A2 of the first corrugated ring 20 is located within the axial region A1 of the end segment 11, that is, the end segment 11 can completely cover the first corrugated ring 20, and there is no bare stent portion of the first corrugated ring 20 exposed axially outside the film-covered body 10. This is to prevent the problem that since the axial part of the first corrugated ring 20 is exposed along the film-covered stent 100, the exposed part of the first corrugated ring 20 is easily pulled by the conveyor 200, resulting in incomplete irreversible deformation of the exposed part of the first corrugated ring 20 when the film-covered stent 100 is compressed. Thus, it is ensured that the first corrugated ring 20 can recover and maintain its shape after release, and further ensure that the end segment 11 and the film-covered stent 100 can better maintain their shapes after release, ensure that the film-covered stent 100 has good wall attachment, improve the occlusion effect of the film-covered stent 100, and avoid internal leakage. For example, at least part of the wave crests of the first corrugated ring 20 are flush with the end face 112 of the end segment 11; or, the wave crests of the first corrugated ring 20 are arranged adjacent to the end face 112 of the end segment 11, and the axial region A2 of the first corrugated ring 20 is located within the axial region A1 of the end segment 11, so that the open end 111 of the end segment 11 can better maintain its shape and can better fit with the inner wall of the blood vessel.

[0087] In some embodiments, the plane where the second part end face 1122 is located is a plane; or, the second part end face 1122 is a concave curved surface or a convex curved surface. Exemplarily, if the second part end face 1122 is a plane, the plane where the second part end face 1122 is located is as shown by ω in Figure 4 , and the plane ω where the second part end face 1122 is located and the first part end face 1121 (marked by a dotted line) enclose a convex region 11a. Refer to Figure 5 , if the second part end face 1122 is concave relative to the first part end face 1121, that is, the second part end face 1122 is a concave curved surface, then the plane ρ where the section of the concave curved surface farthest from the main body segment 12 in the direction perpendicular to the axial direction of the film-covered stent is located and the first part end face 1121 (as marked by a dotted line in Figure 5 ) enclose a convex region 11a. Refer to Figure 6 , if the second part end face 1122 is a convex curved surface, then the plane ρ where the section of the convex curved surface farthest from the main body segment 12 in the direction perpendicular to the axial direction of the film-covered stent is located and the first part end face 1121 (as marked by a dotted line in Figure 6 ) enclose a convex region 11a.

[0088] In some embodiments, the numbers of the first part end face 1121 and the second part end face 1122 can both be designed according to actual needs, such as one, two, three or more. Please refer to Figure 3, in some embodiments, the number of the end faces 1121 of the first part includes at least two, and the plurality of end faces 1121 of the first part are arranged at intervals along the circumferential direction of the membrane-covered stent 100. At least one connecting portion 40 is correspondingly provided on each end face 1121 of the first part to improve the connection reliability between the membrane-covered stent 100 and the conveyor 200. It can be understood that a second part end face 1122 is connected between two adjacent end faces 1121 of the first part. Exemplarily, the plurality of end faces 1121 of the first part are arranged at equal intervals along the circumferential direction, so that the radial support performance of the end section 11 is more uniform, which provides a guarantee for the membrane-covered stent 100 to have good wall attachment performance.

[0089] It can be understood that the connecting portion 40 is formed on at least one of the end section 11 and the first corrugated ring 20, including: the connecting portion 40 is formed on the end section 11 or the first corrugated ring 20; the connecting portion 40 is formed on the end section 11 and the first corrugated ring 20.

[0090] In some embodiments, the connecting portion 40 is used for hooking and cooperating with the anchor 203 of the conveyor 200, and the assembly and release of the connecting portion 40 and the anchor 203 are simple and fast. Exemplarily, one of the anchor 203 and the connecting portion 40 may include a hook, and the other includes a hollow structure or a hole structure that cooperates with the hook.

[0091] Please refer to Figure 4 or Figure 7, in some embodiments, the connecting portion 40 includes a connecting line 41 or a connecting belt 42, and the connecting line 41 or the connecting belt 42 is connected to at least one of the end segment 11 and the first corrugated ring 20. For the connecting portion 40 with such a structure, the force applied by the conveyor 200 to the connecting portion 40 can be more evenly distributed to the whole of the first corrugated ring 20 and the end segment 11, so as to ensure that the end segment 11 and the covered stent 100 can better maintain their shapes after release, enabling the covered stent 100 to better fit the inner wall of the blood vessel and ensuring the wall attachment property of the covered stent 100. Exemplarily, the connecting line 41 or the connecting belt 42 is at least connected to the first corrugated ring 20, and the force applied by the conveyor 200 to the connecting portion 40 can be more evenly distributed to the connection positions of the first corrugated ring 20 and the end segment 11, so as to ensure that the end segment 11 of the covered stent 100 and the covered stent 100 can better maintain their shapes after release and improve the wall attachment property of the covered stent 100. For example, the connecting line 41 is arranged at the peak of the first corrugated ring 20. On the basis of ensuring good wall attachment property of the covered stent 100, the space occupied by the first corrugated ring 20 and the first partial end face 1121 can be fully utilized, making the structure of the covered stent 100 compact and occupying less space. The connecting line 41 or the connecting belt 42 can be arranged on the inner wall of the end segment 11 or on the outer wall of the end segment 11. Exemplarily, the connecting line 41 or the connecting belt 42 is arranged on the inner wall of the end segment 11. When the conveyor 200 implants the covered stent 100 into the blood vessel, it can reduce the damage of the connecting portion 40 to the inner wall of the blood vessel and avoid causing greater irritation or damage to the inner wall of the blood vessel by the connecting portion 40. Among them, the material of the connecting line 41 or the connecting belt 42 includes but is not limited to metal materials, polymer materials or metal and polymer composite materials.

[0092] In this embodiment, the connecting line 41 or the connecting belt 42 is located within the convex region 11a. The connecting line 41 or the connecting belt 42 being located within the convex region 11a can ensure that after the connecting line 41 or the connecting belt 42 is hooked to the anchor 203, the convex region 11a can be more accurately positioned on the anchor 203, reducing or avoiding contact between the non-convex region part of the covered stent 100 and the anchor 203, and thus a sheath with a smaller inner diameter can be selected.

[0093] Exemplarily, the connecting line 41 can include any suitable linear structure or filamentous structure. The connecting belt 42 can include a strip structure or a belt structure, etc., such as including a strip-shaped covering film. One end of the connecting belt 42 is connected to the first corrugated ring 20 and / or the end segment 11, the other end of the connecting belt 42 is connected to the first corrugated ring 20 and / or the end segment 11, and the middle part of the connecting belt 42 is for the anchor 203 of the conveyor 200 to hook.

[0094] Please refer to Figure 8, in some embodiments, the connecting portion 40 includes a connecting hole 43, and the anchor 203 of the conveyor 200 is fixed to the covered stent 100 by passing through the connecting hole 43. Exemplarily, the connecting hole 43 penetrates the end portion 11. In this embodiment, the shape of the connecting hole 43 can be circular, square or irregular.

[0095] It can be understood that at least the end of the connecting hole 43 away from the main body section 12 is disposed within the convex region 11a, including: Case 1, the connecting hole 43 is disposed within the convex region 11a; Case 2, the end of the connecting hole 43 away from the main body section 12 is disposed within the convex region 11a, and the end close to the main body section 12 is disposed in other regions of the end portion 11 other than the convex region 11a.

[0096] Since the position where the anchor 203 is hooked is the end of the connecting hole 43 away from the main body section 12, the end of the connecting hole 43 close to the main body section 12 can be disposed anywhere in the end portion 11.

[0097] Please refer to Figure 2 , Figure 8 and Figure 9 , in some embodiments, the connecting portion 40 includes a first end C1 away from the main body section 12 and a second end C2 close to the main body section 12. The first end C1 is closer to the axis m of the covered stent 100 than the second end C2, so that the connecting portion 40 has a certain inclination angle, making it easier for the anchor 203 of the conveyor 200 to be released from the connecting portion 40. In other embodiments, the distances of the first end C1 and the second end C2 of the connecting portion 40 from the axis m of the covered stent 100 can also be the same; or, the first end C1 of the connecting portion 40 is farther from the axis m of the covered stent 100 than the second end C2.

[0098] Please refer to Figure 8 and Figure 9 , exemplarily, the connecting portion 40 includes a connecting hole 43. The hole wall of the connecting hole 43 has a first end C1 (i.e., the proximal end of the hole wall of the connecting hole 43) and a second end C2 (i.e., the distal end of the hole wall of the connecting hole 43). The angle α between the straight line where the first end C1 and the second end C2 of the connecting hole 43 are located and the axis m of the covered stent 100 is an acute angle. The first end C1 of the hole wall of the connecting hole 43 is closer to the axis m of the covered stent 100 than the second end C2 of the hole wall of the connecting hole 43, so that the connecting hole 43 has a certain inclination angle, making it easier for the anchor 203 of the conveyor 200 to be released from the connecting hole 43. In other embodiments, the angle α between the straight line where the first end C1 and the second end C2 of the connecting hole 43 are located and the axis m of the covered stent 100 may not be an acute angle. For example, the straight line where the first end C1 and the second end C2 of the connecting hole 43 are located is parallel to the axis m of the covered stent 100.

[0099] In Figure 10 it, exemplarily, the connecting part 40 includes a connecting seam 44, and the connecting seam 44 is formed on the end segment 11. Specifically, the connecting seam 44 is marked on the end segment 11, and the connecting seam 44 penetrates through the end segment 11. The anchor 203 of the conveyor 200 fixes the covered stent 100 by passing through the connecting seam 44. In this embodiment, the shape of the connecting seam 44 can be a straight shape (as shown in Figure 10 (c)), a U shape (as shown in Figure 10 (a)), a V shape (as shown in Figure 10 (b)), a W shape, etc. Among them, the U shape, the V shape, the W shape, etc. belong to the connecting seam 44 with the shape of the open end 441. The open end 441 of the connecting seam 44 is close to the main body segment 12, so as to facilitate the anchor 203 of the conveyor 200 to hook from the end of the connecting seam 44 away from the main body segment 12. It can be understood that since the connecting seam 44 with the shape of the open end 441 can be opened to form a larger opening, the connecting seam 44 with the shape of the open end 441 is easier for the anchor 203 of the conveyor 200 to extend into the connecting seam 44 for hooking than the straight-shaped connecting seam 44.

[0100] Combined with Figure 11 and Figure 12 , exemplarily, the connecting part includes a connecting film 45. Part of the first corrugation 20 is arranged between the end segment 11 and the connecting film 45. An insertion opening 450 is arranged between the end segment 11 and the connecting film 45, and the insertion opening 450 is used to insert the anchor 203 of the conveyor 200 to achieve connection. In this embodiment, the connecting film 45 and the end segment 11 are of an integral structure, that is, the connecting film 45 extends from the covered body 10. Specifically, the covered body 10 extends towards the opening end 111, folds inwards at the position of the end face 112, and then extends in the direction away from the opening end 111 to form the connecting film 45. The connecting film 45 is stitched and fixed to both sides of the end segment 11 through a stitching thread 451, and the insertion opening 450 is formed at the position of the connecting film 45 away from the opening end 111. In another embodiment, the connecting film 45 and the end segment 11 are of a non-integral structure, and the connecting film 45 is a separate piece of film. The connecting film 45 can be connected to at least one of the end segment 11 or the first corrugation 20 by stitching or gluing. In one embodiment, the connecting film 45 can be made of a material with a developing function, which can be used to indicate the position of the opening end of the covered stent 100. Specifically, a developing element can be connected to the connecting film 45, or a developing solution can be infiltrated on the connecting film 45, etc.

[0101] Please refer to Figure 13, in some embodiments, the covered stent 100 further includes a second corrugated ring 51, and the second corrugated ring 51 is connected to the end segment 11. The connecting portion 40 includes a connecting hole 43, and one of the peaks of the second corrugated ring 51 is disposed adjacent to the connecting hole 43. Thus, during the assembly and release of the covered stent 100, the second corrugated ring 51 can better support the covered body 10 around the connecting hole 43, avoiding the situation where the connecting portion 40 or the end segment 11 cannot be released from the anchor 203 of the conveyor 200 due to the deformation of the connecting hole 43. It can be understood that one of the peaks of the first corrugated ring 20 can also be disposed adjacent to the connecting seam 44.

[0102] Please refer to Figure 13 , in some embodiments, one of the peaks of the first corrugated ring 20 is disposed adjacent to the connecting hole 43, and along the axial direction of the covered stent 100, the connecting hole 43 is disposed between one of the peaks of the first corrugated ring 20 and one of the peaks of the second corrugated ring 51. Thus, during the assembly and release of the covered stent 100, both the first corrugated ring 20 and the second corrugated ring 51 can better support the covered body 10 around the connecting hole 43, effectively avoiding the situation where the connecting portion 40 or the end segment 11 cannot be released from the anchor 203 of the conveyor 200 due to the deformation of the connecting hole 43. Exemplarily, one of the peaks of the first corrugated ring 20, the connecting hole 43, and one of the peaks of the second corrugated ring 51 are arranged in sequence along the axial direction of the covered stent 100, and one of the peaks of the first corrugated ring 20 is closer to the end face 112 of the end segment 11 than one of the peaks of the second corrugated ring 51. In other embodiments, the second corrugated ring 51 can also intersect or not intersect with the first corrugated ring 20, and there is a certain circumferential distance between the peak of the second corrugated ring 51 and the connecting hole 43.

[0103] In some embodiments, the first corrugated ring 20 includes a corrugated ring structure formed by the first support wires, and the first corrugated ring 20 is elastically deformable and can be partially or entirely made of an elastic material. For example, the first corrugated ring 20 can be made of a material with good tensile and rebound properties and good biocompatibility, such as materials like nitinol and stainless steel. Since the first corrugated ring 20 has good tensile and rebound properties, it has the elastic force to recover from deformation by itself. The first corrugated ring 20 has the property of elastic deformability, thus being able to increase the anchoring force in the radial direction of the covered body 10 and improve the stability during the use of the covered stent 100. In other embodiments, the first corrugated ring 20 can also be made of a non-elastic material. For example, in the first corrugated ring 20 made of a non-elastic material, adjacent wave rods are rotatably connected by arranging pivot members. At this time, the first corrugated ring 20 itself does not have elastic force, and its deformation depends on the covered body 10 with self-expansion ability and / or other corrugated rings of the covered stent 100 to drive.

[0104] Please refer to Figure 14, in some embodiments, the first wave loop 20 includes a first waveform segment 21. In some embodiments, the first waveform segment 21 includes at least one first wave 21a. Exemplarily, the first waveform segment 21 includes a first wave rod 211 and a second wave rod 212, and the adjacent first wave rod 211 and the second wave rod 212 are connected to the same first wave peak 213 to form the first wave 21a.

[0105] Exemplarily, the position of the first waveform segment 21 or the first wave 21a is coaxially arranged with the position of the first part end face 1121, so that the first waveform segment 21 or the first wave 21a can support the first part end face 1121.

[0106] Please refer to Figure 14 , in some embodiments, the first wave loop 20 further includes a second waveform segment 22. Exemplarily, the first waveform segment 21 is connected to the second waveform segment 22. In some embodiments, the second waveform segment 22 includes at least one second wave 22a. Exemplarily, the first wave loop 20 includes a third wave rod 221 and a fourth wave rod 222, and the adjacent third wave rod 221 and the fourth wave rod 222 are connected to the same second wave peak 223 to form the second wave 22a.

[0107] Exemplarily, the position of the second waveform segment 22 or the second wave 22a is coaxially arranged with the position of the second part end face 1122, so that the second waveform segment 22 or the second wave 22a can support the second part end face 1122.

[0108] Exemplarily, the first part end face 1121, the wave peak of the first wave 21a, and at least part of the connecting portion 40 are arranged in sequence along the axis of the covered stent 100, the structure of the covered stent 100 is compact, and the wall attachment property of the end segment 11 is good. In some other embodiments, the first wave loop 20 may also intersect with the end face 112 of the end segment 11.

[0109] Please refer to Figure 14, in some embodiments, the peak of the first wave 21a is located in the convex region 11a so that the first wave 21a can effectively support the convex region 11a. Exemplarily, the first wave 21a is located within the end segment 11, preventing at least a part of the first wave 21a from being exposed outside the end segment 11, and the first wave 21a is connected to the end segment 11 and relatively fixed thereto, so that the first wave 21a is always not separated from the end segment 11, avoiding the problem that the first wave 21a is easily pulled by the conveyor 200 and causes an incompletely reversible deformation of the first wave 21a when the covered stent 100 is compressed. Thus, it is ensured that the first wave 21a and the end segment 11 can recover and maintain their shapes after release, further ensuring that the covered stent 100 has good wall attachment, improving the occlusion effect of the covered stent 100, and avoiding endoleakage; compared with the case where at least a part of the first wave 21a is axially exposed outside the end segment 11, the axial region of the first wave 21a in this embodiment is located within the axial region of the end segment 11, which can reduce the collision or friction between the first wave ring 20 and the conveyor 200, thereby reducing the unnecessary interference between the covered stent 100 and the conveyor 200 during assembly and / or release. For example, the peak of the first wave 21a is adjacent to the convex vertex of the first part end face 1121, or the peak of the first wave 21a is located on the first part end face 1121 to effectively support the convex region 11a of the covered body 10 and the end of the covered stent 100, so that the covered stent 100 has better wall attachment and is not prone to blood leakage after the covered stent 100 is implanted into the blood vessel.

[0110] Exemplarily, the second wave 22a is located within the end segment 11, preventing at least a part of the second wave 22a from being exposed outside the end segment 11, so that the exposed part of the second wave 22a is easily pulled by the conveyor 200 and causes an incompletely reversible deformation of the exposed part of the second wave 22a when the covered stent 100 is compressed. Thus, it is ensured that the second wave 22a can recover and maintain its shape after release, further ensuring that the end segment 11 and the covered stent 100 can better maintain their shapes after release, ensuring that the covered stent 100 has good wall attachment, improving the occlusion effect of the covered stent 100, and avoiding endoleakage. For example, the peak of the second wave 22a is adjacent to the second part end face 1122, or the peak of the second wave 22a is located on the second part end face 1122, so that the second wave 22a can effectively support the second part end face 1122 of the covered body 10 and the end of the covered stent 100, so that the covered stent 100 has better wall attachment and is not prone to blood leakage after the covered stent 100 is implanted into the blood vessel.

[0111] Understandably, the wire diameter, wave height, number of waves, and wave angle of the first wave ring 20 can all be set according to actual requirements. For example, the wire diameter of the first wave ring 20 ranges from 0.3 mm to 0.45 mm, such as 0.3 mm, 0.4 mm, 0.45 mm, or any other suitable value between 0.3 mm and 0.45 mm. The wave height of the first wave 21a and / or the second wave 22a ranges from 1 mm to 15 mm, such as 1 mm, 5 mm, 15 mm, or any other suitable value between 1 mm and 15 mm. The number of the first wave 21a and / or the second wave 22a ranges from 3 to 30, such as 3, 6, 10, 20, 30, or any other suitable value between 3 and 30. The more the number of waves of the wave ring, the greater the radial support force on the end of the covered stent 100, which can effectively improve the wall attachment effect of the end of the covered stent 100.

[0112] Please refer to Figure 14 , in some embodiments, the first wave ring 20 includes a first waveform segment 21 and a second waveform segment 22. The radial support strength of the first waveform segment 21 is less than that of the second waveform segment 22. The area where the end segment 11 on the covered stent 100 is located is the first area 100a. Understandably, the first area 100a includes the end segment 11 and the wave rings provided on the end segment 11.

[0113] Understandably, when the covered stent 100 is released from the conveyor 200, the first wave ring 20 will rebound under the action of its own elastic force. During the rebound process of the first wave ring 20, it will drive the first area 100a to contact the inner wall of the blood vessel. Since the radial support strength of the first waveform segment 21 is less than that of the second waveform segment 22, the second waveform segment 22 rebounds faster than the first waveform segment 21, and the first area 100a is released unevenly in the circumferential direction, resulting in uneven force of the first area 100a on the inner wall of the blood vessel in the circumferential direction. It is easy to make the force inside the blood vessel more concentrated, and it is easy to impact or damage the blood vessel during the release process, causing discomfort to the patient and even causing vasospasm; in addition, the non-uniform release of the first area 100a in the circumferential direction will also affect the shape of the covered stent 100 after compression and release, making the wall attachment of the first area 100a insufficient, thus easily generating endoleakage and increasing the surgical risk. For this reason, please refer to Figure 15 , in some embodiments, the covered stent 100 further includes a balance structure 50. The balance structure 50 is arranged in the first area 100a, and the balance structure 50 is used to increase the radial support strength of the area in the first area 100a that is coaxial with the first waveform segment 21. In this embodiment, the balance structure 50 is located on the surface of the end segment 11 or between the inner and outer surfaces.

[0114] The covered stent 100 of the above embodiment. Since the covered stent 100 includes a balance structure 50 connected to the end section 11, the balance structure 50 is used to increase the radial support strength of the area coaxial with the first corrugated section 21 in the first region 100a. The balance structure 50 can balance the radial support strengths of the area coaxial with the first corrugated section 21 and the area coaxial with the second corrugated section 22 in the first region 100a, and reduce the difference between the release speeds of the area coaxial with the first corrugated section 21 and the area coaxial with the second corrugated section 22 in the first region 100a. As a result, the first region 100a and the covered stent 100 are released more uniformly in the circumferential direction, making the acting forces of the first region 100a and the covered stent 100 on the inner wall of the blood vessel more uniform in the circumferential direction, reducing the phenomenon of more concentrated stress on the inner wall of the blood vessel, and reducing the irritation and damage to the blood vessel during the release process. In addition, the uniform release of the first region 100a in the circumferential direction enables the end section 11 or the first region 100a to better maintain its shape after the covered stent 100 is compressed and released, making the wall attachment of the first region 100a and the covered stent 100 good, avoiding the occurrence of endoleakage, and reducing the surgical risk.

[0115] In some embodiments, the radial support strength of the first wave 21a is less than that of the second wave 22a. Exemplarily, the wave height of the first wave 21a is greater than that of the second wave 22a, and the wave angle of the first wave 21a is equal to that of the second wave 22a, so that the radial support strength of the first wave 21a is less than that of the second wave 22a. Exemplarily, when the axial region of the first wave loop 20 is located within the axial region of the end section 11, the wave height of the first wave 21a is greater than that of the second wave 22a, and the wave angle of the first wave 21a is equal to that of the second wave 22a, which can enable the first wave 21a to better support the first partial end face 1121 and make the radial support strength of the first wave 21a less than that of the second wave 22a. When the first wave loop 20 is at least partially exposed outside the axial region of the end section 11 along the axis, the wave height of the first wave 21a is greater than that of the second wave 22a, and the wave angle of the first wave 21a is equal to that of the second wave 22a, which can enable the first wave 21a to be more easily and conveniently connected to the anchor 203 of the delivery device 200 and make the radial support strength of the first wave 21a less than that of the second wave 22a. In other embodiments, the wave height of the first wave 21a may also be less than or equal to that of the second wave 22a. The wave angle of the first wave 21a may also be greater than or less than that of the second wave 22a.

[0116] In other embodiments, the radial support strength of the first corrugated section 21 is greater than or equal to that of the second corrugated section 22. The radial support strength of the first wave 21a is greater than or equal to that of the second wave 22a.

[0117] Please refer to Figure 15 and Figure 16 In some embodiments, the balancing structure 50 includes a second corrugated ring 51. The second corrugated ring 51 is connected to the end section 11. The second corrugated ring 51 is used to increase the radial support strength of the area coaxial with the first corrugated section 21 in the first region 100a, so as to balance the radial support strengths of the area coaxial with the first corrugated section 21 and the area coaxial with the second corrugated section 22 in the first region 100a, and reduce the difference between the release speeds of the area coaxial with the first corrugated section 21 and the area coaxial with the second corrugated section 22 in the first region 100a, so that the first region 100a and the covered stent 100 are released more uniformly in the circumferential direction. In addition, the second corrugated ring 51 can also play a role in strengthening the support of the end section 11, ensuring that the first region 100a can adhere well to the wall after release, and avoiding the problem of blood leakage caused by the "bird's beak" shape of the first region 100a. In other embodiments, the balancing structure 50 is not necessarily a corrugated ring structure and can be a separate element, such as a mesh or a block made of metal or plastic, etc.

[0118] In some embodiments, the balancing structure 50 is located within the end section 11 so that the balancing structure 50 can effectively increase the radial support strength of the area coaxial with the first corrugated section 21 in the first region 100a. Exemplarily, the first corrugated ring 20 and the balancing structure 50 are arranged at an axial interval along the covered stent 100 to avoid problems where the balancing structure 50 interferes with the connection and release of the first corrugated ring 20 and the delivery device 200.

[0119] In some embodiments, the second corrugated ring 51 can also intersect with the first corrugated ring 20, as Figure 14 shown; and / or, the second corrugated ring 51 is located within the end section 11. In some embodiments, please refer to Figure 14 and Figure 16 . The proximal end of the second corrugated ring 51 or the proximal end of the balancing structure 50 can be arranged adjacent to the end face 112 of the end section 11, specifically adjacent to the second part end face 1122, so that the second corrugated ring 51 or at least part of the balancing structure 50 can support the end face 112 of the end section 11 to a certain extent, so that the end face 112 of the end section 11 can maintain a good shape after the covered stent 100 is compressed and released, and further make the covered stent 100 have better wall adhesion and is not prone to blood leakage.

[0120] Please refer to Figure 17, in some embodiments, at least two of the end face 112 of the end segment 11, the first corrugated ring 20, and the second corrugated ring 51 are axially spaced apart. Exemplarily, the end face 112 of the end segment 11, the first corrugated ring 20, and the second corrugated ring 51 are sequentially axially spaced apart along the axial direction of the covered stent 100. Thus, the processing of the covered stent 100 is easy.

[0121] In some embodiments, the axial region of the second corrugated ring 51 at least partially overlaps with the axial region of the first corrugated ring 20, reducing the axial distance between the second corrugated ring 51 and the first corrugated ring 20. This can increase the radial support strength at the proximal end of the covered stent 100, enhance the radial support force of the first region 100a, thereby increasing the anchoring property of the proximal end of the covered stent 100 in the blood vessel. Furthermore, it makes the proximal end of the covered stent 100 not easily displaced, improves the sealing performance of the covered stent 100, and enables the structure of the covered stent 100 to be more compact.

[0122] Please refer to Figure 17 , in some embodiments, the second corrugated ring 51 is connected to the end segment 11, and the second corrugated ring 51 is located within the end segment 11. For example, at least part of the wave crests of the second corrugated ring 51 are flush with the end face 112 of the end segment 11; or, the wave crests of the second corrugated ring 51 are spaced apart from the end face 112 of the end segment 11 by a certain distance, and the end face 112 of the end segment 11 is disposed at the proximal end relative to the wave crests of the second corrugated ring 51. Exemplarily, as shown in the figure, the second corrugated ring 51 is located within the end segment 11, and the wave crest of the first corrugated segment 21 is axially spaced apart from one of the wave crests of the second corrugated ring 51 along the axial direction of the covered stent 100.

[0123] Please refer to Figure 17 , in some embodiments, the second corrugated ring 51 includes a third wave 511 and a fourth wave 512. The radial support strength of the third wave 511 is less than that of the fourth wave 512. The fourth wave 512 is axially aligned with the first corrugated segment 21, and the third wave 511 is axially aligned with the second corrugated segment 22. This enables the second corrugated ring 51 to balance the circumferential support strength of the first region 100a, making the release of the first region 100a more uniform circumferentially. Furthermore, it makes the forces exerted by the first region 100a and the covered stent 100 on the inner wall of the blood vessel more uniform circumferentially.

[0124] Exemplarily, at least one third wave 511 may be provided between two adjacent fourth waves 512, and at least one fourth wave 512 may be provided between two adjacent third waves 511.

[0125] In some embodiments, the wave height of the third wave 511 is equal to the wave height of the fourth wave 512, and the wave angle of the third wave 511 is smaller than the wave angle of the fourth wave 512, so that the radial support strength of the third wave 511 is smaller than the radial support strength of the fourth wave 512. In other embodiments, the wave height of the third wave 511 may also be smaller than or larger than the wave height of the fourth wave 512, and the wave angle of the third wave 511 may also be larger than or equal to the wave angle of the fourth wave 512, which is not limited herein, as long as the radial support strength of the third wave 511 is smaller than the radial support strength of the fourth wave 512.

[0126] Exemplarily, the first waveform segment 21 includes the first wave 21a, the second waveform segment 22 includes the second wave 22a, the wave height of the first wave 21a is greater than the wave height of the second wave 22a, and the wave angle of the first wave 21a is equal to the wave angle of the second wave 22a; the wave height of the third wave 511 is equal to the wave height of the fourth wave 512, and the wave angle of the third wave 511 is smaller than the wave angle of the fourth wave 512, so that the second wave ring 51 can effectively balance the radial support strengths of the area coaxial with the first waveform segment 21 and the area coaxial with the second waveform segment 22 in the first region 100a, and reduce the difference between the release speeds of the area coaxial with the first waveform segment 21 and the area coaxial with the second waveform segment 22 in the first region 100a, so that the first region 100a is released more uniformly in the circumferential direction. In addition, both the first wave ring 20 and the second wave ring 51 can play a role in strengthening the support of the end segment 11, effectively ensuring that the first region 100a can adhere well to the wall after release.

[0127] Please refer to Figure 17 , exemplarily, the third wave 511 includes a fifth wave rod 5111 and a sixth wave rod 5112, and the adjacent fifth wave rod 5111 and sixth wave rod 5112 are connected to the same third wave peak 5113 to form the third wave 511. The fourth wave 512 includes a seventh wave rod 5121 and an eighth wave rod 5122, and the adjacent seventh wave rod 5121 and eighth wave rod 5122 are connected to the same fourth wave peak 5123 to form the fourth wave 512.

[0128] Exemplarily, the wave rods of the third wave 511 include straight lines, broken lines or curves. For example, please refer to Figure 17 , the wave rods of the third wave 511 and / or the fourth wave 512 include straight lines. Again, for example, please refer to Figure 18 , the wave rods of the third wave 511 and / or the fourth wave 512 include broken lines. The third wave 511 with a wave rod in the shape of a curve can be more easily extended without disturbing other waves, so that to a certain extent, it is easier to support the end face 112 of the end segment 11, and further enables the end face 112 of the end segment 11 to maintain a good shape after the compression and release of the covered stent 100.

[0129] Exemplarily, the number of wave peaks of the first wave loop 20 and the number of wave peaks of the second wave loop 51 may be the same or different, which is not limited herein. The number of the first waves 21a and the third waves 511 may be the same or different; the number of the second waves 22a and the fourth waves 512 may be the same or different.

[0130] Please refer to Figure 18 , in some embodiments, the balance structure 50 further includes a third wave loop 52. The third wave loop 52 is connected to the end segment 11 and is used to increase the radial support strength of the area coaxial with the first waveform segment 21 in the first area 100a, so as to balance the radial support strength of the area coaxial with the first waveform segment 21 and the area coaxial with the second waveform segment 22 in the first area 100a, and reduce the difference between the release speeds of the area coaxial with the first waveform segment 21 and the area coaxial with the second waveform segment 22 in the first area 100a, so that the first area 100a and the covered stent 100 are released more uniformly in the circumferential direction. In addition, the third wave loop 52 can also play a role in strengthening the support of the end segment 11, ensuring that the first area 100a can adhere to the wall well after release, and avoiding blood leakage caused by the beak shape of the first area 100a. In this embodiment, the third wave loop 52 is also an annular wave loop, and the third wave loop 52 and the second wave loop 51 have a partially overlapping area.

[0131] Please refer to Figure 18 , in some embodiments, the second wave loop 51 is used to form a closed structure 53. The closed structure 53 is coaxially arranged with the first waveform segment 21. It can be understood that since the second wave loop 51 and the third wave loop 52 are both fixed to the covered body 10, the closed structure 53 is also fixed to the covered body 10. In particular, the vertices of the closed structure 53 are fixed. When the covered stent 100 is radially compressed, the proximal vertex of the closed structure 53 moves proximally, and the distal vertex of the closed structure 53 moves distally. At this time, the covered part surrounded by the closed structure 53 is simultaneously pulled axially proximally and axially distally. When the covered part in the closed structure 53 is pulled to the limit, the closed structure 53 is difficult to be radially compressed anymore. Therefore, the covered part surrounded by the closed structure 53 hinders the radial compression of the closed structure 53, and the closed structure 53 is not easily radially compressed. Therefore, the radial support strength of the closed structure 53 is greater than that of the non-closed structure.

[0132] Please refer to Figure 18 , in some embodiments, the third wave loop 52 intersects with the second wave loop 51 and cooperates to form a closed structure 53, so as to further increase the radial support strength of the area coaxial with the first waveform segment 21 in the first area 100a, and make the first area 100a release more uniformly along the circumferential direction as much as possible.

[0133] Please refer to Figure 18 , in some embodiments, one of the troughs of the third wave loop 52 is axially spaced from one of the peaks of the second wave loop 51 along the axis of the covered stent 100, and the third wave loop 52 intersects the second wave loop 51 so that the second wave loop 51 and the third wave loop 52 cooperate to form a closed structure 53.

[0134] Please refer to Figure 18 , in some embodiments, the axial region of the third wave loop 52 at least partially overlaps with the axial region of the second wave loop 51 to improve the support performance of the balance structure 50, so that the balance structure 50 can better balance the radial support strength in the circumferential direction of the first region 100a and the covered stent 100, and further improve the release uniformity of the first region 100a and the covered stent 100 in the circumferential direction.

[0135] Exemplarily, the heights of the waves in the third wave loop 52 may be the same, different, or partially the same, and are not limited herein.

[0136] Please refer to Figure 18 , in some embodiments, the wave height of the waves in the third wave loop 52 is less than the wave height of the waves in the second wave loop 51, and the axial region of the third wave loop 52 is located within the axial region of the second wave loop 51. In this way, the balance structure 50 can not only balance the radial support strength in the circumferential direction of the covered stent 100, but also is beneficial to making the structure of the covered stent 100 more compact. Moreover, the axial distance between the third wave loop 52 and the second wave loop 51 is reduced, which can increase the radial support strength at the proximal end of the covered stent 100, thereby increasing the anchoring property of the proximal end of the covered stent 100 in the blood vessel, so that the covered stent 100 is not easily displaced in the blood vessel. Exemplarily, the distal end (at least part of the troughs) of the third wave loop 52 is flush with the distal end (at least part of the troughs) of the second wave loop 51.

[0137] In some embodiments, the number of peaks of the third wave loop 52 is greater than or equal to the number of peaks of the second wave loop 51 to improve the radial support performance of the balance structure 50, so that the balance structure 50 can better balance the radial support strength in the circumferential direction of the first region 100a and the covered stent 100. For example, the number of peaks of the third wave loop 52 is twice the number of peaks of the second wave loop 51. In other embodiments, the number of peaks of the third wave loop 52 may also be less than the number of peaks of the second wave loop 51.

[0138] Exemplarily, the peaks of the third wave loop 52 are farther from the end face 112 of the end segment 11 than the peaks of the second wave loop 51. In this way, the connection between the second wave loop 51 and the third wave loop 52 and the end segment 11 is convenient, simple, and easy.

[0139] Understandably, at least part of the peaks of the third corrugated ring 52 can be disposed at any suitable position. For example, at least part of the peaks of the third corrugated ring 52 are located on at least one of the fifth corrugated rod 5111, the sixth corrugated rod 5112, the seventh corrugated rod 5121, and the eighth corrugated rod 5122. Alternatively, the peaks of the third corrugated ring 52 can be disposed at at least one of the following positions: between the fifth corrugated rod 5111 and the sixth corrugated rod 5112; between the sixth corrugated rod 5112 and the seventh corrugated rod 5121; between the seventh corrugated rod 5121 and the eighth corrugated rod 5122; between the eighth corrugated rod 5122 and the fifth corrugated rod 5111.

[0140] Exemplarily, the axial region of the third corrugated ring 52 is located within the axial region of the end segment 11, and the axial region of the third corrugated ring 52 is located within the axial region of the second corrugated ring 51, so as to better increase the radial support strength of the region coaxial with the first waveform segment 21 in the first region 100a, making the force exerted on the inner wall of the blood vessel in the circumferential direction in the first region 100a more uniform, reducing or avoiding the phenomenon of concentrated stress on the inner wall of the blood vessel, thereby reducing or avoiding damage to the blood vessel; in addition, it can also enable the end segment 11 to be released more uniformly, ensure that the end segment 11 can better maintain its shape after release, enable the end segment 11 to better fit the inner wall of the blood vessel, improve the wall attachment property of the end segment 11 of the covered stent 100, and further avoid the occurrence of endoleakage.

[0141] The shape of the closed structure 53 can be set according to actual needs, such as including at least one of the following: quadrilateral, pentagon, hexagon, other polygons, other irregular closed shapes, etc. For example, please refer to Figure 18 , the shape of the closed structure 53 includes a quadrilateral or a rhombus. Alternatively, please refer to Figure 19 , the shape of the closed structure 53 includes a hexagon.

[0142] In one embodiment, the balance structure 50 includes at least one of the following: the second corrugated ring 51, the third corrugated ring 52, the fourth corrugated ring 54, other corrugated rings. Please refer to Figure 20, Exemplarily, the balancing structure 50 includes a second corrugated ring 51, a third corrugated ring 52, and a fourth corrugated ring 54. The second corrugated ring 51, the third corrugated ring 52, and the fourth corrugated ring 54 are respectively connected to the end segment 11. The fourth corrugated ring 54 may intersect with the second corrugated ring 51 and / or the third corrugated ring 52. The balancing structure 50 including multiple corrugated rings can effectively increase the radial support strength of the area coaxial with the first waveform segment 21 in the first region 100a. When the radial support strength between the waveform segments of the first corrugated ring 20 in the circumferential direction varies too much, or the overall radial support strength of the proximal end of the covered stent 100 is too small, a balancing structure 50 including multiple corrugated rings can be provided at the corresponding position to make the overall radial support strength of the proximal end (or the first region 100a) of the covered stent 100 appropriate as much as possible and the release in the circumferential direction of the proximal end of the covered stent 100 more uniform. In addition, each corrugated ring of the balancing structure 50 can also support the end segment 11 respectively, ensuring that the first region 100a can adhere well to the blood vessel wall after release and avoiding blood leakage caused by the formation of beak-like shapes at the ends of the covered stent 100. Exemplarily, the second corrugated ring 51, the third corrugated ring 52, and the fourth corrugated ring 54 are all continuous waveform structures.

[0143] It can be understood that the wire diameter, wave height, wave number, and / or wave angle of the second corrugated ring 51, the third corrugated ring 52, and the fourth corrugated ring 54 can all be set according to actual needs and are not limited herein.

[0144] In some embodiments, the wire diameter of the third corrugated ring 52 is smaller than that of the second corrugated ring 51. The function of the third corrugated ring 52 is to supplement the radial support of the second corrugated ring 52. However, the radial support strength of the third corrugated ring 52 should not be too large, otherwise it is easy to cause irritation to the blood vessel in the first region 100a or even burst the blood vessel.

[0145] Please refer to Figure 21 , In some embodiments, in the first region 100a, there is at least one first intersection point 61 in the area coaxial with the first waveform segment 21. The first intersection point 61 is formed by the intersection of the first waveform segment 21 and the balancing structure 50 or formed by the balancing structure 50 itself, which can increase the radial support strength of the first region 100a and make the release of the first region 100 more uniform in the axial direction. Please refer to Figure 21, in some embodiments, the first intersection point 61 is formed by the intersection of at least two of the second wave loop 51, the third wave loop 52, and the fourth wave loop 54 of the balance structure 50. For example, the number of the first intersection points 61 is six, denoted as intersection points D1, D2, D3, D4, D5, and D6 respectively. The third wave loop 52 and the fourth wave loop 54 intersect in a region coaxial with the first waveform segment 21 to form intersection points D1 and D2. The second wave loop 51, the third wave loop 52, and the fourth wave loop 54 intersect in a region coaxial with the first waveform segment 21 to form intersection points D3 and D4. The second wave loop 51 and the third wave loop 52 intersect in a region coaxial with the first waveform segment 21 to form intersection points D5 and D6. Thus, the combination of the third wave loop 52 and the fourth wave loop 54, the combination of the second wave loop 51, the third wave loop 52, and the fourth wave loop 54, and the combination of the second wave loop 51 and the third wave loop 52 can respectively resist the radial extrusion force as a whole, thereby further improving the radial supporting force, improving the wall attachment property of the first region 100a and the proximal end of the covered stent 100, and avoiding the problem of blood leakage.

[0146] In some embodiments, the intersection points D1 and D2 are symmetrically arranged with respect to the first preset line, the intersection points D3 and D4 are symmetrically arranged with respect to the first preset line, and the intersection points D5 and D6 are symmetrically arranged with respect to the first preset line, so that the radial supporting performance of the first region 100a is more uniform, and the wall attachment property of the first region 100a and the covered stent 100 is improved. Exemplarily, the first preset line passes through the peak of the first wave 21a, and the first preset line passes through the peak in the region of the second wave loop 51 coaxial with the first wave 21a. Exemplarily, the first preset line is as Figure 21 shown by the dashed line n1 in

[0147] Please refer to Figure 21, in some embodiments, in the first region 100a, there are a plurality of second intersection points 62 in the region coaxial with the second waveform segment 22. The number of the first intersection points 61 is greater than the number of the second intersection points 62, where the second intersection point 50a is formed by the intersection of the second waveform segment 22 and the balance structure 50 or formed by the balance structure 50 itself. The number of the first intersection points 61 being greater than the number of the second intersection points 62 is beneficial to the balance structure 50 better balancing the radial support strengths of the region coaxial with the first waveform segment 21 and the region coaxial with the second waveform segment 22 in the first region 100a, effectively reducing the difference between the release speeds of the region coaxial with the first waveform segment 21 and the region coaxial with the second waveform segment 22 in the first region 100a, so that the first region 100a and the covered stent 100 are released more uniformly in the circumferential direction, making the acting forces of the first region 100a and the covered stent 100 on the inner wall of the blood vessel more uniform in the circumferential direction, reducing the occurrence of the phenomenon that the force on the inner wall of the blood vessel is more concentrated, reducing the stimulation and damage to the blood vessel during the release process, and also being beneficial to the end segment 11 or the first region 100a being able to better maintain its shape after the covered stent 100 is compressed and released, so that the first region 100a and the covered stent 100 have good wall attachment properties.

[0148] Please refer to Figure 21 , in some embodiments, the second intersection point 62 is formed by the intersection of at least two of the second wave loop 51, the third wave loop 52 and the fourth wave loop 54 of the balance structure 50. For example, the number of the second intersection points 62 includes two, denoted as intersection point H1 and intersection point H2 respectively. The second wave loop 51, the third wave loop 52 and the fourth wave loop 54 intersect in the region coaxial with the second waveform segment 22 to form the intersection points H1 and H2. The combination of the second wave loop 51, the third wave loop 52 and the fourth wave loop 54 can resist the radial extrusion force as a whole, thereby further improving the radial support force and improving the wall attachment properties of the first region 100a and the proximal end of the covered stent 100, and avoiding the problem of blood leakage.

[0149] In some embodiments, the intersection points H1 and H2 are symmetrically arranged with respect to the second preset line, so that the radial support performance of the first region 100a is more uniform, and the wall attachment properties of the first region 100a and the covered stent 100 are improved. Exemplarily, the second preset line passes through the peak of the second wave 22a, and the second preset line passes through the peak in the region coaxial with the second wave 22a in the second wave loop 51. Exemplarily, the second preset line is as Figure 21 shown by the dotted line n2 in

[0150] Exemplarily, the covered stent 100 can be prepared in the following manner: a metal wire is woven into a desired waveform. The metal wire can be a nitinol wire, and the wire diameter is, for example, 0.35 mm. After heat setting, steel sleeves are sleeved on both ends of the metal wire and fixed by mechanical pressing to tightly connect the metal wire and the steel sleeves, thereby forming a metal ring. After the waveform ring structure is fabricated, a film is covered on the surface of multiple sequentially arranged waveform ring structures. For example, an e-PTFE film can be integrally covered on the inner surface and the outer surface of the multiple waveform ring structures. The multiple waveform ring structures are located between two layers of the covered film. By means of high-temperature pressing, the inner and outer layers of the e-PTFE covered film are bonded together, thereby fixing the multiple waveform ring structures between the two layers of the covered film. Of course, when the waveform ring structure is integrally formed by cutting a metal tube, it is not necessary to fixedly connect it through a steel sleeve. An e-PTFE film can also be integrally covered on the inner surface or the outer surface of the multiple waveform ring structures.

[0151] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "mechanically coupled", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. The mechanical coupling or coupling of two components includes direct coupling and indirect coupling. For example, a direct fixed connection, a connection through a transmission mechanism, etc. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0152] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0153] The foregoing disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. Further, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0154] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific method steps, features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific method steps, features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0155] As described above, the foregoing are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily conceive of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A covered stent, characterized in that, it comprises: a covered body, including an end section with an open end and a main body section connected to the end section; a first corrugated ring, connected to the end section and relatively fixed to the end section; a connecting part, formed on at least one of the end section and the first corrugated ring, for connecting to a conveyor; wherein, the end face of the end section includes a first partial end face and a second partial end face connected to each other, the first partial end face and the second partial end face are arranged along the circumferential direction of the covered body; compared with the second partial end face, the first partial end face protrudes away from the main body section, and an outward convex area is formed between the plane where the second partial end face is located or the plane of the section of the second partial end face that is farthest from the main body section in the direction perpendicular to the axial direction of the covered stent and the first partial end face, and at least the end away from the main body section of the connecting part is arranged in the outward convex area, for driving the outward convex area to be positioned on the conveyor.

2. The covered stent according to claim 1, characterized in that, the connecting part is located in the outward convex area.

3. The covered stent according to claim 1, characterized in that, the first corrugated ring includes a first wave and a second wave, the wave crest of the first wave protrudes more away from the main body section than the wave crest of the second wave, and the wave crest of the first wave is located in the outward convex area.

4. The covered stent according to claim 2, characterized in that, the wave crest of the second wave is adjacent to or located on the second partial end face.

5. The covered stent according to claim 1, characterized in that, the connecting part includes a connecting wire or a connecting band, the connecting wire or the connecting band is connected to at least one of the end section and the first corrugated ring; or, the connecting part includes a connecting hole or a connecting slit, and the connecting hole or the connecting slit penetrates through the end section.

6. The covered stent according to claim 1, characterized in that, the connecting part includes a connecting film, part of the first corrugated ring is arranged between the end section and the connecting film, and an insertion opening is arranged between the end section and the connecting film, and the insertion opening is used for inserting the conveyor and connecting to the conveyor.

7. The covered stent according to claim 6, characterized in that, the connecting film and the end section are of an integral structure.

8. The covered stent according to claim 6, characterized in that, the connecting film is made of a material with a developing function.

9. The covered stent according to claim 1, characterized in that, the connecting part includes a first end away from the main body section and a second end close to the main body section, and the first end is closer to the longitudinal central axis of the covered stent than the second end.

10. The covered stent according to claim 1, characterized in that, the number of the first partial end faces includes at least two, and a plurality of the first partial end faces are arranged at intervals along the circumferential direction.

11. The covered stent according to claim 5, characterized in that, When the connecting portion includes a connecting hole or a connecting seam, the covered stent further includes a second corrugated ring, the second corrugated ring is connected to the end portion section, and one of the wave crests of the second corrugated ring is disposed adjacent to the connecting hole or the connecting seam.

12. The covered stent according to any one of claims 1-11, wherein, the first corrugated ring includes a first corrugated segment and a second corrugated segment, the radial support strength of the first corrugated segment is less than the radial support strength of the second corrugated segment, the area where the end portion section is located on the covered stent is a first area, and the covered stent further includes: a balance structure disposed in the first area for increasing the radial support strength of the area in the first area that is coaxial with the first corrugated segment.

13. A delivery system, wherein, it includes: a delivery device; and the covered stent according to any one of claims 1-12, and the delivery device is used for delivering the covered stent.

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