Intravascular implant

Abstract

The invention provides an intravascular implant. The intravascular implant comprises a limiting body, a main body bracket and a branch interface piece, the limiting body comprises an annular part and a separation part, the separation part is arranged in the annular part and divides an inner cavity of the annular part into a first cavity and a second cavity, the first cavity and the second cavity are arranged in the radial direction of the annular part, and the second cavity is located on one side of the axis of the annular part; the main body stent comprises a first covering film and a stent body, and the stent body comprises a plurality of stent rings which are sequentially arranged at intervals in the axial direction of the main body stent; the first covering film covers part of the outer surface of the stent body; the main body stent comprises a first section, and the first section is positioned between two adjacent stent rings; the first section is partially arranged in the first cavity in a penetrating manner and is connected with the annular part; the near end of the branch interface piece is connected to the first section and is communicated with the main body bracket; at least part of the branch connector piece is arranged in the second cavity in a penetrating mode and connected with the annular part. In the actual application process, the branch connector piece is arranged corresponding to a branch blood vessel and can be connected with the near end of a branch stent which is subsequently implanted into the branch blood vessel. The second cavity provides an accommodating space for the branch interface piece, so that the branch interface piece is protected by the annular part and the separation part together, the branch interface piece is prevented from collapsing due to extrusion of blood vessels or other tissues, and the problem that the branch stent is blocked is avoided.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to an intravascular implant. Background Technology

[0002] With the improvement of living standards, significant changes have occurred in dietary structure and lifestyle, leading to a year-on-year increase in the incidence of vascular diseases. Common vascular diseases mainly refer to atherosclerosis, inflammatory vascular diseases, functional vascular diseases, and true neoplastic diseases of blood vessels. Compared with the high risks during and after traditional surgery, minimally invasive interventional surgery has become a major treatment method for vascular diseases due to its advantages such as less trauma, less pain, and faster recovery. Vascular stents are the main medical devices used in minimally invasive interventional vascular surgery. With the support of modern medical angiography technology, vascular stents are guided into the diseased blood vessel through a guidewire and expand using their own properties or by using a balloon to form a tubular structure with a certain inner diameter to support the narrowed or occluded segment of the blood vessel, reduce vascular retraction, maintain unobstructed blood flow, and reshape the blood vessel.

[0003] From the perspective of expansion method, stents are divided into self-expanding stents and balloon-expandable stents. Self-expanding stents are more flexible and are generally used for lesions that are long enough and require less support. Balloon-expandable stents provide greater support and are more accurately positioned, mainly used for shorter, eccentric, and especially severely calcified lesions. From the perspective of structure, stents can be divided into bare-metal stents, drug-eluting stents, and covered stents. Bare-metal stents, drug-eluting stents, and covered stents can all be used to treat vascular stenosis. Compared to bare-metal stents, drug-eluting stents can reduce restenosis rate and increase endothelial velocity. When the elasticity of the stenotic site is severely insufficient or there is severe calcification, diffuse thrombosis, or even complete occlusion, the use of bare-metal or drug-eluting stents may lead to serious risks such as vascular tearing, vascular dissection, thrombus detachment, and thrombus migration. Therefore, covered stents are generally chosen for treatment of such lesions. In addition, covered stents can also be used in cases of aneurysms, vascular dissection, and vascular perforation. From a clinical perspective, the primary patency rate and target lesion reconstruction rate of covered stents are significantly higher than those of bare stents.

[0004] Currently, most of the covered stents commonly available on the market are straight tubes, which are difficult to apply to the treatment of lesions involving branch vessels of organs. Summary of the Invention

[0005] The purpose of this invention is to provide an intravascular implant that can be used to treat lesions involving branch vessels of organs and can effectively prevent the occurrence of branch vessel blockage.

[0006] To achieve the above objectives, the present invention provides an intravascular implant, comprising:

[0007] The limiting body includes an annular portion and a partition portion. The partition portion is disposed within the annular portion and divides the inner cavity of the annular portion into a first cavity and a second cavity. The first cavity and the second cavity are arranged radially along the annular portion, and the second cavity is located on one side of the axis of the annular portion.

[0008] A main support structure includes a first covering film and a support body, the support body comprising a plurality of support rings arranged at intervals along the axial direction of the main support structure; the first covering film covers a portion of the surface of the support body; the main support structure includes a first segment located between two adjacent support rings; the first segment partially passes through a first cavity and is also connected to the annular portion; and,

[0009] A branch interface component, the proximal end of which is connected to the first segment and communicates with the main support; the branch interface component is at least partially inserted into the second cavity and connected to the annular portion.

[0010] Optionally, there are two limiting bodies, namely a first limiting body and a second limiting body. The first limiting body and the second limiting body are arranged at intervals along the axial direction of the main body support, and the first limiting body is located on the proximal side of the second limiting body.

[0011] The first segment includes a first branch joint segment and a second branch joint segment, the first branch joint segment being connected to the proximal end of the second branch joint segment; the first branch joint segment is at least partially inserted into the first cavity of the first limiting body, and the second branch joint segment is partially inserted into the first cavity of the second limiting body;

[0012] At least one of the branch interface components is disposed at the first branch joint section, and at least one of the branch interface components is disposed at the second branch joint section; each of the branch joint components disposed at the first branch joint section is at least partially inserted into the second cavity of the first limiting body, and each of the branch joint components disposed at the second branch joint section is at least partially inserted into the second cavity of the second limiting body.

[0013] Optionally, the main support further includes a second segment connected to the proximal end of the first branch joint segment and a third segment connected to the distal end of the second branch joint segment; the outer diameter of the second segment, the diameter of the inscribed circle of the first branch joint segment, the diameter of the inscribed circle of the second branch joint segment, and the outer diameter of the third segment decrease sequentially.

[0014] Optionally, the outer diameter of the annular portion of the first limiting body is equal to the outer diameter of the stent ring disposed at the second segment, the outer diameter of the annular portion of the second limiting body is smaller than the outer diameter of the annular portion of the first limiting body, and the outer diameter of the annular portion of the second limiting body is larger than the outer diameter of the stent ring disposed at the third segment; on a plane perpendicular to the axial direction of the main stent, the projection of the stent body is tangent to the projection of all the annular portions on the side of the annular portion away from the separator; the annular portion includes alternating peaks and troughs along its circumference; the separator includes alternating peaks and troughs; all peaks face the proximal end of the intravascular implant, and all troughs face the distal end of the intravascular implant;

[0015] The annular portion includes a first portion and a second portion connected along its own circumference, the second portion and the partition portion enclosing to form a second cavity; the crest of the second portion protrudes beyond the crest of the first portion and the crest of the partition portion;

[0016] The partition portion of the first limiting body is connected to the first covering film, and the crest of the second portion of the annular portion of the first limiting body is connected to the first covering film at the distal end of the second segment; the partition portion of the second limiting body is connected to the first covering film, and the crest of the second portion of the annular portion of the second limiting body is connected to the first covering film at the distal end of the first branch joint segment.

[0017] Optionally, the first branch joint section is provided with two branch interface components, namely a first branch interface component and a second branch interface component; the second branch joint section is provided with two branch interface components, namely a third branch interface component and a fourth branch interface component.

[0018] The proximal ends of the first branch interface component, the second branch interface component, the third branch interface component, and the fourth branch interface component are arranged sequentially along the axial direction from proximal end to distal end of the main support.

[0019] Optionally, the main support further includes a fourth segment, which is connected to the distal end of the third segment, and the outer diameter of the fourth segment is larger than the outer diameter of the third segment.

[0020] Optionally, the stent ring includes a first stent ring, a second stent ring, and at least one third stent ring arranged sequentially at intervals along a direction from proximal to distal end, wherein the first stent ring, the second stent ring, and the third stent ring are all disposed on the second segment; the first covering film covers the distal portion of the first stent ring, the second stent ring, and all of the third stent rings.

[0021] Optionally, the proximal end of the first support ring is provided with barbs.

[0022] Optionally, the second stent ring also has peaks and troughs arranged alternately along its own circumference, with the peaks of the second stent ring facing the proximal end of the intravascular implant and the troughs of the second stent ring facing the troughs of the intravascular implant.

[0023] The second stent ring includes a first stent segment and a second stent segment arranged alternately along its own circumference. A trough is formed at the junction of the first stent segment and the second stent segment. Each of the first stent segment and each of the second stent segments includes a crest, and the crest of the first stent segment protrudes beyond the crest of the second stent segment. The crest of the first stent segment is flush with the proximal end of the first covering film and is connected to the first covering film.

[0024] Optionally, the branch interface component includes a second membrane and support rings connected to both axial ends of the second membrane, wherein the plane containing the support rings located near the proximal end of the second membrane is inclined relative to the axis of the branch interface component; the projection of the branch interface component onto a plane perpendicular to its axis is circular.

[0025] Compared with the prior art, the intravascular implant of the present invention has the following advantages:

[0026] The aforementioned intravascular implant includes a limiting body, a main stent, and a branch interface device. The limiting body includes an annular portion and a partition portion. The partition portion is disposed within the annular portion and divides the inner cavity of the annular portion into a first cavity and a second cavity. The first cavity and the second cavity are arranged radially along the annular portion, and the second cavity is located on one side of the axis of the annular portion. The main stent includes a first cover and a stent body. The stent body includes a plurality of stent rings arranged sequentially at intervals along the axial direction of the main stent. The first cover covers a portion of the outer surface of the stent body. The main stent includes a first segment located between two adjacent stent rings, and the first segment partially passes through the first cavity and connects to the annular portion. The proximal end of the branch interface device is connected to the first segment and communicates with the main stent. The branch interface device at least partially passes through the second cavity and connects to the annular portion. In practical applications, the branch interface device is positioned corresponding to a branch vessel and can connect to the proximal end of a branch stent subsequently implanted into the branch vessel. The second cavity provides a receiving space for the branch interface, so as to protect the branch interface by means of the annular portion and the partition portion, so as to avoid the branch interface from collapsing due to compression by blood vessels or other tissues, thereby avoiding the problem of branch stent occlusion. Attached Figure Description

[0027] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0028] Figure 1 This is a schematic diagram of the structure of an intravascular implant provided according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of an intravascular implant according to an embodiment of the present invention. Figure 2 and Figure 1 The observation directions are different;

[0030] Figure 3 yes Figure 2 A schematic diagram of the projection of the stent and limiting body of the intravascular implant onto a plane perpendicular to the axis of the main stent.

[0031] Figure 4 This is a schematic diagram of the structure of an intravascular implant according to an embodiment of the present invention, wherein the stent body and the limiting body are not shown in the figure;

[0032] Figure 5 This is a schematic diagram of the structure of the limiting body of the intravascular implant provided by the present invention according to an embodiment;

[0033] Figure 6 This is the structure of an intravascular implant at the first segment according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram showing the deformation of the limiting body when the first segment of the intravascular implant provided by the present invention is subjected to compressive force, according to an embodiment of the present invention. The dotted line in the figure represents the limiting body after deformation.

[0035] Figure 8 This is a schematic diagram illustrating an application scenario of an intravascular implant provided by the present invention according to an embodiment;

[0036] Figure 9 This invention provides a structure of an intravascular implant at the first segment according to one embodiment. Figure 9 The limiting body is not shown, and the first branch interface component, the second branch interface component, the third branch interface component and the fourth branch interface component are distinguished.

[0037] Figure 10 This is a partial structural schematic diagram of the limiting body of the intravascular implant provided by the present invention according to an embodiment;

[0038] Figure 11 This is the structure of the intravascular implant provided by the present invention at the first segment according to an embodiment. The partition is shown in the figure with a dashed line, and the position where the first part is connected to the first cover is outlined with a circle.

[0039] Figure 12 This is a schematic diagram of the branch interface component of an intravascular implant according to an embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the projection of the branch interface component of the intravascular implant provided by the present invention on a plane perpendicular to its own axis, according to an embodiment of the present invention.

[0041] Figure 14 This is a schematic diagram of the first segment of an intravascular implant provided according to an embodiment of the present invention.

[0042] [The annotations in the attached figures are explained below]:

[0043] 100 - Intravascular implant, 1000 - Main stent, 1100 - Stent body, 1110 - Stent ring, 1111 - First stent ring, 1112 - Second stent ring, 1112a - First stent segment, 1112b - Second stent segment, 1113 - Third stent ring, 1010 - First segment, 1011 - First branch junction segment, 1012 - Second branch junction segment, 1020 - Second segment, 1030 - Third segment, 1040 -Fourth segment, 2000-branch interface component, 2000a-first branch interface component, 2000b-second branch interface component, 2000c-third branch interface component, 2000d-fourth branch interface component, 2100-first covering film, 2200-support ring, 3000-limiting body, 3100-annular part, 3110-first part, 3120-second part, 3200-separation part, 3001-first cavity, 3002-second cavity. Detailed Implementation

[0044] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0045] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0046] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “a plurality” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “installed,” “connected,” and “linked” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two elements or an interaction between two elements. Relational terms such as “first,” “second,” etc., are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly specify the number of indicated technical features. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The terms “proximal” and “distal” used in this article are based on the relative positions and orientations of the various components and parts of the medical device. Although they are not restrictive, “proximal” usually refers to the end of the medical device that is closer to the operator during normal use, while “distal” is the end opposite to “proximal”. “Distal” enters the patient’s body before “proximal”.

[0048] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0049] Figures 1 to 4 This is a schematic diagram of the structure of an intravascular implant 100 provided in an embodiment of the present invention. Figures 1 to 4As shown, the intravascular implant 100 includes a main stent 1000, a branch interface 2000, and a limiting body 3000.

[0050] The main support 1000 includes a support body 1100 and a first covering film 1200. The support body 1100 includes a plurality of support rings 1110, which are arranged sequentially at intervals along the axial direction of the main support 1000. Figure 1 and Figure 2 In the diagram, the dotted double-headed arrow X indicates the axial direction of the main support 1000. The first covering film 1200 covers a portion of the surface of the support body 1100. The main support 1000 includes a first segment 1010, which is located between two adjacent support rings 1110. That is, the first segment 1010 only has the first covering film 1200, and does not have the support rings 1110.

[0051] The proximal end of the branch interface component 2000 is connected to the first segment 1010 and communicates with the main support 1000.

[0052] The limiting body 3000 is disposed at the first segment 1010, such that the limiting body 3000 is located between the proximal end of the support ring 1110 adjacent to the first segment 1010 and the distal end of the support ring 1110 adjacent to the first segment 1010. Figure 5 As shown, the limiting body 3000 includes an annular portion 3100 and a dividing portion 3200. The dividing portion 3200 is disposed within and connected to the annular portion 3100, dividing the inner cavity of the annular portion 3100 into a first cavity 3001 and a second cavity 3002. The first cavity 3001 and the second cavity 3002 are arranged radially along the annular portion 3100, with the axis of the annular portion 3100 passing through the first cavity 3001, and the second cavity 3002 being offset from the axis of the annular portion 3100 and located on one side of the axis of the annular portion 3100.

[0053] Please combine Figure 5 and Figure 6 The first segment 1010 of the main support 1000 partially passes through the first cavity 3001 and is connected to the annular portion 3100. The branch interface 2000 at least partially passes through the second cavity 3002 and is connected to the annular portion 3100.

[0054] The intravascular implant 100 provided in this embodiment of the invention can be applied to lesions involving branch vessels. In application, the main stent 1000 is implanted within the main vessel, and the branch interface 2000 is positioned corresponding to the branch vessel and can connect proximally to the branch stent subsequently implanted into the branch vessel. In this way, the limiting body 3000 can protect the branch interface 2000. Even if a vessel or other tissue applies a compressive force F to the intravascular implant 100 at the first segment 1010, the limiting body 3000 can resist this compressive force and prevent the branch interface 2000 from being compressed and collapsing. This ensures that the branch interface 2000 can provide sufficient operating space for the superselective use of the guidewire of the branch stent, and also ensures that after the branch stent is implanted into the corresponding branch vessel, blood can flow into the corresponding branch stent via the branch interface 2000, avoiding the risk of branch stent occlusion. Specifically, as follows... Figure 7 As shown, under the pressure of the extrusion force F, the annular portion 3100 contracts in a direction perpendicular to the arrangement direction of the first cavity 3001 and the second cavity 3002, and the portion of the annular portion 3100 away from the first cavity 3001 contracts in a direction away from the first cavity 3001. Figure 7 As indicated by arrow S1, the separator 3200 moves toward the axis of the annular portion 3100. Figure 7 The recess (indicated by arrow S2) causes the limiting body 3000 to deform. Figure 7 The shape shown by the dotted line in the figure increases the space of the second cavity 3002 so that the branch interface 2000 is not squeezed.

[0055] It is understood that the first segment 1010 is located between the proximal and distal ends of the main support 1000. In other words, the distance from the proximal end of the first segment 1010 to the proximal end of the main support 1000 is greater than zero, and the distance from the distal end of the first segment 1010 to the distal end of the main support 1000 is also greater than zero. Furthermore, a portion of the support rings 1110 of the support body 1100 are disposed on the proximal side of the first segment 1010, and another portion of the support rings 1110 are disposed on the distal side of the first segment 1010. It is understood that a support ring 1110 immediately adjacent to the proximal end of the first segment 1010 and a support ring 1110 immediately adjacent to the distal end of the first segment 1010 are two adjacent support rings 1110, and the distance S1 between these two support rings 1110 (e.g., ...) Figure 1 (As shown) is greater than the distance S2 between any two other adjacent support rings 1110 (e.g.) Figure 1 As shown), to provide sufficient space for the setting of the limiting body 3000.

[0056] The stent ring 1110 and the limiting body 3000 are preferably made of highly elastic materials, thus making both the stent ring 1110 and the limiting body 3000 self-expanding structures, so that the intravascular implant 100 is a self-expanding stent. A preferred highly elastic material is nickel-titanium alloy. The first covering 1200 can be made of polyester or any other suitable material. The first covering 1200 is connected to the stent body 1100 and the limiting body 3000 by bonding, welding, sewing, or any other suitable method. The first covering 1200 preferably covers a portion of the outer peripheral surface of the stent body 1100.

[0057] The support ring 1110 is formed by cutting or weaving and has alternating peaks and troughs along its circumference. The annular portion 3100 is formed by cutting or weaving and has alternating peaks and troughs along its circumference. The partition portion 3200 is a wave-shaped structure with alternating peaks and troughs. It should be understood that the partition portion can be part of an annular structure, and the peaks and troughs of the partition portion 3200 are alternating along the circumference of the annular structure in which it is located. The partition portion 3200 is formed by cutting or weaving and is connected to the annular portion 3100 in any suitable manner. The peaks of the stent ring 1110, the annular portion 3100, and the septum 3200 all face towards the proximal end of the intravascular implant 100, while the troughs of the stent ring 1110, the annular portion 3100, and the septum 3200 all face towards the distal end of the medical overlay 100.

[0058] The branch interface 2000 is preferably connected to the trough of the annular portion 3100. In this way, the branch interface 2000 will not shrink, deform or shift after being implanted into the blood vessel, and can smoothly unfold into a columnar shape, which is conducive to the guide wire of the branch stent entering the branch interface 2000 and to the implantation of the branch stent.

[0059] In some cases, only one limiting body 3000 is provided at the first segment 1010, the number of branch interface pieces 2000 is one or two, and all of the branch interface pieces 2000 pass through the second cavity 3002 of the limiting body 3000.

[0060] In other cases, such as Figure 1 and Figure 2As shown, the first segment 1010 is divided into a first branch joint segment 1011 and a second branch joint segment 1012 connected axially along the main support 1000. The first branch joint segment 1011 is located on the proximal side of the second branch joint segment 1012. Simultaneously, there are two limiting bodies 3000, arranged axially along the main support 1000 and corresponding to the two branch joint segments. That is, one limiting body 3000 is located at the first branch joint segment 1011, and the other limiting body 3000 is located at the second branch joint segment 1012. Preferably, the second cavities 3002 of the two limiting bodies 3000 are aligned circumferentially with respect to the main support 1000. For ease of description, the limiting body 3000 located at the first branch joint segment 1011 is referred to as the first limiting body (not labeled in the figure), and the limiting body 3000 located at the second branch joint segment 1012 is referred to as the second limiting body. The first branch joint segment 1011 is at least partially inserted into the first cavity 3001 of the first limiting body, and the second branch joint segment 1012 is at least partially inserted into the first cavity 3001 of the second limiting body. In these cases, there are two or more branch interface pieces 2000, and at least one branch interface piece 2000 is connected to the first branch joint segment 1011, and at least one branch interface piece 2000 is connected to the second branch joint segment 1012. Furthermore, each branch interface piece 2000 disposed at the first branch joint segment 1011 is at least partially inserted into the second cavity 3002 of the first limiting body, and each branch interface piece 2000 disposed at the second branch joint segment 1012 is at least partially inserted into the second cavity 3002 of the second limiting body. It should be understood that the circumferential direction of the main support 1000 refers to the direction surrounding the axis of the main support 1000.

[0061] In a typical embodiment, such as Figure 8 As shown, the intravascular implant 100 is applied to the thoracic and abdominal aorta. It is well known that the thoracic and abdominal aorta is connected to four branch arteries: the celiac artery (CA), the superior mesenteric artery (SMA), the left renal artery (LRA), and the right renal artery (RRA). In this scenario, there are four branch interface devices 2000, one corresponding to the celiac artery, another to the superior mesenteric artery, another to the left renal artery, and yet another to the right renal artery. For ease of description, as... Figure 9As shown, the branch interface 2000 corresponding to the celiac artery will be referred to as the first branch interface 2000a, the branch interface 2000 corresponding to the superior mesenteric artery will be referred to as the second branch interface 2000b, the branch interface 2000 corresponding to the left renal artery will be referred to as the third branch interface 2000c, and the branch interface 2000 corresponding to the right renal artery will be referred to as the fourth branch interface 2000d.

[0062] The first branch interface component 2000a and the second branch interface component 2000b are disposed on the first branch engagement section 1011. The first branch interface component 2000a is at least partially inserted into the second cavity 3002 of the first limiting body, and the second branch interface component 2000b is at least partially inserted into the second cavity 3002 of the first limiting body. The third branch interface component 2000c and the fourth branch interface component 2000d are disposed on the second branch engagement section 1012. The third branch interface component 2000c is at least partially inserted into the second cavity 3002 of the second limiting body, and the fourth branch interface component 2000d is at least partially inserted into the second cavity 3002 of the second limiting body.

[0063] Furthermore, the connection position of the first branch interface 2000a to the main stent 1000 is located proximal to the connection position of the second branch interface 2000b to the main stent 1000, and the connection position of the third branch interface 2000c to the main stent 1000 is located proximal to the connection position of the fourth branch interface 2000d to the main stent 1000. That is, the proximal ends of the first branch interface 2000a, the second branch interface 2000b, the third branch interface 2000c, and the fourth branch interface 2000d are arranged on the main stent 1000 in a proximal-to-distal direction. This arrangement allows the intravascular implant 100 to better adapt to the anatomical structure of human blood vessels, facilitating the implantation of each branch vessel 2000 into the corresponding artery. In practice, the distance L from the distal end of the first branch junction segment 1012 to the entrance end of the celiac artery (e.g., ...) is... Figure 8 (As shown) should be 0-100mm to avoid bending of the branch stent that subsequently enters the celiac artery along the guidewire.

[0064] Preferably, the distal end face of the branch interface member 2000 disposed on the first branch junction segment 1011 is different from the distal end face of the first segment 2000 disposed on the second branch junction segment 1012. Therefore, when the intravascular implant 100 is implanted into a blood vessel, the branch interface member 2000 disposed on the first branch junction segment 1011 and the branch junction segment 2000 disposed on the second branch junction segment 1012 are staggered within the blood vessel, reducing the risk of interference and compression between branch stents subsequently implanted into various branch blood vessels. In the intravascular implant 100 applied to the thoracic and abdominal aorta, the distal end faces of the first branch interface member 2000a and the second branch interface member 2000b can be the same or different, and the distal end faces of the third branch interface member 2000c and the fourth branch interface member 2000d can be the same or different.

[0065] Please return to the reference. Figures 1 to 4 In this document, the portion of the main support 1000 located on the proximal side of the first branch joint section 1011 is referred to as the second segment 1020. Furthermore, the main support 1000 also includes a third segment 1030 connected to the distal side of the second branch joint section 1012.

[0066] The outer diameter of the second segment 1020, the diameter of the inscribed circle of the first branch joint segment 1011, the diameter of the inscribed circle of the second branch joint segment 1012, and the outer diameter of the third segment 1030 decrease sequentially. Those skilled in the art will understand that the outer diameters of the second segment 1020 and the third segment 1030 are primarily determined by the outer diameter of the support ring 1110 located at the corresponding positions. That is, the outer diameter of the second segment 1020 is primarily determined by the outer diameter of the support ring 1110 located at the second segment 1020, and the outer diameter of the third segment 1030 is primarily determined by the outer diameter of the support ring 1110 located at the third segment 1030. In other words, the outer diameter of the support ring 1110 located at the second segment 1020 is larger than the outer diameter of the support ring 1110 located at the third segment 1030. Furthermore, in this embodiment of the invention, the outer diameter of the annular portion 3100 of the first limiting body may be equal to the outer diameter of the support ring 1110 disposed at the second segment 1020, the outer diameter of the annular portion 3100 of the second limiting body is smaller than the outer diameter of the annular portion 3100 of the first limiting body, and the outer diameter of the annular portion 3100 of the second limiting body is larger than the outer diameter of the support ring 1110 disposed at the third segment 1030. Thus, please refer to... Figure 9The first segment 1010 is formed into a funnel-like structure, which facilitates the superselective entry of the guide wires of each branch stent into the corresponding branch interface 2000, which helps to shorten the operation time and also reduces the risk of mutual interference and compression of the branch stents implanted in each branch blood vessel.

[0067] In some embodiments, all the support rings 1110 and the annular portions 3100 of all the limiting bodies 3000 are arranged coaxially. However, in preferred embodiments, such as Figure 2 and Figure 3 As shown, in a plane perpendicular to the axial direction of the main support 1000, the projection of the support body 1100 (including all the stent rings 1110 disposed on the second segment 1020, the third segment 1030, and the fourth segment 1040 mentioned later) is tangent to the projection of the annular portions 3100 of all the limiting bodies 3000 on the side of the axis of the annular portion 3100 away from the partition 3200. In other words, the intravascular implant 100 has a cross-section that is tangent to all the stent rings 1110 and also to all the annular portions 3100 of the limiting bodies 3000, and the cross-section is located on opposite sides of the axis of the corresponding annular portion 3100 of any of the partitions 3200. Thus, the funnel-like structure formed at the first segment 1010 has a larger space, which is more conducive to the superselective entry of the guide wires of each branch stent into the corresponding branch interface 2000, which can further shorten the operation time and further reduce the risk of mutual interference and compression of the branch stents implanted in each branch vessel. It can be understood that, in Figure 3 In this configuration, the projection of the annular portion 3100 of the first limiting body coincides with the projection of the support ring 1110 disposed on the second segment 1020. Furthermore, in this case, the axis of the main support 1000 can be taken as the straight line containing the axis of any designated support ring 1110, for example, the axis of the main support 1000 can be taken as the axis of the support ring 1110 disposed on the third segment 1030.

[0068] exist Figure 2 and Figure 9 In the intravascular implant 100 shown, the main stent 1000 forms a first step at the first branch junction 1011 and a second step at the second branch junction 1012. The first cover 1200 has significant redundancy at the first and second steps. If the first cover 1200 is not treated, the redundancy of the first cover 1200 will cause significant instability in the morphology of the intravascular implant 100 at the first segment 1010.

[0069] To resolve this issue, please refer to... Figure 10 and Figure 11 The annular portion 3100 includes a first portion 3110 and a second portion 3120 connected circumferentially therearound. The first portion 3110 and the partition portion 3200 enclose a first cavity 3001, and the second portion 3120 and the partition portion 3200 enclose a second cavity 3002. The peak of the second portion 3120 protrudes beyond the peaks of the first portion 3110 and the partition portion 3200. The peak of the second portion 3120 of the annular portion 3100 of the first limiting body (( Figure 11 The area (circled by a dashed line) is connected to the first covering film 1200 at the distal end of the second segment 1020. The partition portion 3200 of the first limiting body is also integrally connected to the first covering film 1200 at the first branch joint segment 1011. This allows the crest of the second portion 3120 of the first limiting body, together with the partition portion 3200, to fix the redundancy of the first covering film 1200 at the first step, improving the morphological stability of the main support 1000 at the first step, reducing the risk of deformation and twisting of the first covering film 1200 at the first step due to blood flow impact, radial compression, etc., and ensuring the morphological and positional stability of the first segment 2000 connected to the first branch joint segment 1011. Optionally, the annular portion 3100 of the first limiting body may include three crests at the second portion 3120.

[0070] Similarly, the crest of the second portion 3120 of the second limiting body is connected to the first covering film 1200 at the distal end of the first branch joint section 1011, and the partition portion 3200 of the second limiting body is integrally connected to the first covering film 1200 at the second branch joint section 1012. Thus, by fixing the redundancy of the first covering film 1200 at the second step together with the partition portion 3200, the morphological stability of the main support 1000 at the second step is improved, the risk of deformation and twisting of the first covering film 1200 at the second step due to blood flow impact, radial compression, etc., is reduced, and the morphological and positional stability of the first segment 2000 connected to the second branch joint section 1012 is ensured.

[0071] The following describes other configurations of the intravascular implant 1000.

[0072] Please refer to Figure 12 and Figure 13The branch interface 2000 includes a second cover 2100 and support rings 2200 connected to both axial ends of the second cover 2100. The plane containing the support rings 2200 located proximally to the second cover 2100 is inclined relative to the axis of the branch interface 2000. Preferably, the plane containing the support rings 2200 located distally to the second cover 2100 is also inclined relative to the axis of the branch interface 2000, and the two planes containing the support rings 2200 are parallel to each other. Furthermore, the projection of the branch interface 2000 onto a plane perpendicular to its own axis is circular. This design has the advantages of: firstly, it facilitates easier connection between the branch interface 2000 and the main stent 1000; secondly, it optimizes the gripping performance of the intravascular implant 100 at the first segment 1010 without affecting the superselective operation of the guidewire used for subsequent branch stent implantation; and thirdly, this branch interface 2000 offers greater flexibility and a wider range of anatomical adaptation.

[0073] Optionally, the acute angle α formed by the plane containing the support ring 2200 and the plane perpendicular to the axial direction of the branch interface member 2000 can be 2° to 15°. Furthermore, the support ring 220 is configured to be reproducible and is connected to the second coating 2100 in any suitable manner.

[0074] Please return to the reference. Figures 1 to 4 The main support 1000 further includes a fourth segment 1040 connected to the distal end of the third segment 1030, the outer diameter of which is larger than that of the third segment 1030. This is advantageous because after the intravascular implant 100 is implanted into a blood vessel, the fourth segment 1040 can support the vessel wall, thereby improving the anchoring performance of the distal end of the intravascular implant 100 within the blood vessel. Furthermore, when other medical stents need to be placed at the distal end of the intravascular implant 100, the fourth segment 1040 allows for better bridging of the intravascular implant 100 with other medical stents. It is understood that the outer diameter of the fourth segment 1040 is determined by the outer diameter of the stent ring 1110 disposed at the fourth segment 1040; that is, the outer diameter of the stent ring 1110 disposed at the fourth segment 1040 is larger than that of the stent ring 1110 disposed at the third segment 1030.

[0075] Please refer to this again. Figure 14The stent rings 1110 disposed on the second segment 1020 have three types: a first stent ring 1111, a second stent ring 1112, and a third stent ring 1113. There is one first stent ring 1111, one second stent ring 1112, and at least one third stent ring 1113. One first stent ring 1111, one second stent ring 1112, and at least one third stent ring 1113 are arranged at intervals from proximal to distal. The first covering film 1200 covers the distal portion of the first stent ring 1111, and also covers all the second stent rings 1112 and all the third stent rings 1113. It should be understood that the first covering film 1200 also covers all the stent rings 1130 disposed on the third segment 1030 and on the fourth segment 1040.

[0076] The first stent ring 1111 is mainly used to connect with the delivery device during the delivery phase of the intravascular implant 100, and to adhere closely to the vessel wall after the intravascular implant 100 is released into the blood vessel to apply radial anchoring force to the vessel wall, thereby achieving anchoring of the intravascular implant 100 within the blood vessel. Preferably, the first covering 1200 only covers the trough of the first stent ring 1111 to increase the axial length of the portion of the first stent ring 1111 exposed on the proximal side of the first covering 1200, thereby enhancing the anchoring performance of the first stent ring 1111 within the blood vessel. Further, the proximal end of the first stent ring 1111 is provided with barbs (not shown in the figure), which are used to embed into the vessel wall when the intravascular implant 100 is implanted into the blood vessel, further strengthening the anchoring performance of the proximal end of the intravascular implant 100 within the blood vessel.

[0077] The second stent ring 1112 includes a first stent segment 1112a and a second stent segment 1112b arranged alternately along its circumference. A trough is formed at the junction of the first stent segment 1112a and the second stent segment 1112b. Each first stent segment 1112a includes a crest, and each second stent segment 1112b also includes a crest, with the crest of the first stent segment 1112a protruding beyond the crest of the second stent segment 1112b. The crest of the first stent segment 1112a is flush with and connected to the proximal end of the first cover 1200. The structure of the second stent ring 1112 helps reduce the risk of proximal blood leakage from the intravascular implant 100 and also reduces the radial force on the intravascular implant 100 during gripping.

[0078] The third stent ring 1113 extends helically along the axis of the second segment 1020 and includes multiple helical coils. The multiple helical coils of the same third stent ring 1113 are arranged at equal intervals along the axial direction of the second segment 1020. The third stent ring 1113 can fit tightly against the blood vessel wall, enhancing the anchoring force of the intravascular implant 100 within the blood vessel.

[0079] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. An intravascular implant, characterized in that, include: The limiting body includes an annular portion and a partition portion. The partition portion is disposed within the annular portion and divides the inner cavity of the annular portion into a first cavity and a second cavity. The first cavity and the second cavity are arranged radially along the annular portion, and the second cavity is located on one side of the axis of the annular portion. A main support structure includes a first covering film and a support body, the support body comprising a plurality of support rings arranged at intervals along the axial direction of the main support structure; the first covering film covers a portion of the surface of the support body; the main support structure includes a first segment located between two adjacent support rings; the first segment partially passes through a first cavity and is also connected to the annular portion; and, A branch interface component, the proximal end of which is connected to the first segment and communicates with the main support; the branch interface component is at least partially inserted into the second cavity and connected to the annular portion.

2. The intravascular implant according to claim 1, characterized in that, The number of limiting bodies is two, namely a first limiting body and a second limiting body. The first limiting body and the second limiting body are arranged at intervals along the axial direction of the main body support, and the first limiting body is located on the proximal side of the second limiting body. The first segment includes a first branch joint segment and a second branch joint segment, the first branch joint segment being connected to the proximal end of the second branch joint segment; the first branch joint segment is at least partially inserted into the first cavity of the first limiting body, and the second branch joint segment is partially inserted into the first cavity of the second limiting body; At least one of the branch interface components is disposed at the first branch joint section, and at least one of the branch interface components is disposed at the second branch joint section; each of the branch joint components disposed at the first branch joint section is at least partially inserted into the second cavity of the first limiting body, and each of the branch joint components disposed at the second branch joint section is at least partially inserted into the second cavity of the second limiting body.

3. The intravascular implant according to claim 2, characterized in that, The main support also includes a second segment connected to the proximal end of the first branch joint section and a third segment connected to the distal end of the second branch joint section; the outer diameter of the second segment, the diameter of the inscribed circle of the first branch joint section, the diameter of the inscribed circle of the second branch joint section, and the outer diameter of the third segment decrease sequentially.

4. The intravascular implant according to claim 3, characterized in that, The outer diameter of the annular portion of the first limiting body is equal to the outer diameter of the stent ring disposed at the second segment; the outer diameter of the annular portion of the second limiting body is smaller than the outer diameter of the annular portion of the first limiting body; and the outer diameter of the annular portion of the second limiting body is larger than the outer diameter of the stent ring disposed at the third segment. On a plane perpendicular to the axial direction of the main stent, the projection of the stent body is tangent to the projections of all the annular portions on the side of the annular portion away from the dividing portion. The annular portion includes alternating peaks and troughs along its circumference. The dividing portion includes alternating peaks and troughs. All peaks face the proximal end of the intravascular implant, and all troughs face the distal end of the intravascular implant. The annular portion includes a first portion and a second portion connected along its own circumference, the second portion and the partition portion enclosing to form a second cavity; the crest of the second portion protrudes beyond the crest of the first portion and the crest of the partition portion; The partition portion of the first limiting body is connected to the first covering film, and the crest of the second portion of the annular portion of the first limiting body is connected to the first covering film at the distal end of the second segment; the partition portion of the second limiting body is connected to the first covering film, and the crest of the second portion of the annular portion of the second limiting body is connected to the first covering film at the distal end of the first branch joint segment.

5. The intravascular implant according to claim 3, characterized in that, The first branch joint section is provided with two branch interface components, namely a first branch interface component and a second branch interface component; the second branch joint section is provided with two branch interface components, namely a third branch interface component and a fourth branch interface component; The proximal ends of the first branch interface component, the second branch interface component, the third branch interface component, and the fourth branch interface component are arranged sequentially along the axial direction from proximal end to distal end of the main support.

6. The intravascular implant according to claim 3, characterized in that, The main support also includes a fourth segment, which is connected to the distal end of the third segment, and the outer diameter of the fourth segment is larger than the outer diameter of the third segment.

7. The intravascular implant according to claim 3, characterized in that, The stent ring includes a first stent ring, a second stent ring, and at least one third stent ring arranged sequentially at intervals from the proximal end to the distal end, wherein the first stent ring, the second stent ring, and the third stent ring are all disposed on the second segment; the first covering film covers the distal portion of the first stent ring, the second stent ring, and all of the third stent rings.

8. The intravascular implant according to claim 8, characterized in that, The proximal end of the first support ring is provided with barbs.

9. The intravascular implant according to claim 8, characterized in that, The second stent ring also has peaks and troughs arranged alternately along its own circumference, with the peaks of the second stent ring facing the proximal end of the intravascular implant and the troughs of the second stent ring facing the troughs of the intravascular implant. The second stent ring includes a first stent segment and a second stent segment arranged alternately along its own circumference. A trough is formed at the junction of the first stent segment and the second stent segment. Each of the first stent segment and each of the second stent segments includes a crest, and the crest of the first stent segment protrudes beyond the crest of the second stent segment. The crest of the first stent segment is flush with the proximal end of the first covering film and is connected to the first covering film.

10. The intravascular implant according to claim 1, characterized in that, The branch interface component includes a second membrane and support rings connected to both axial ends of the second membrane. The plane containing the support rings located near the second membrane is inclined relative to the axis of the branch interface component. The projection of the branch interface component onto a plane perpendicular to its axis is circular.

Images