Extravascular stent and stent assembly

Abstract

The invention relates to an extravascular stent and a stent assembly, and belongs to the technical field of medical instruments. The stent assembly comprises an installation mechanism and an extravascular stent, the extravascular stent comprises a skeleton and a covering film, the skeleton is tubular and can elastically deform, an installation opening is formed in one side of the skeleton so that the skeleton can be opened or closed, and the covering film covers the skeleton and seals the skeleton. According to the stent assembly, the mounting mechanism is used for expanding the vascular outer stent, the vascular outer stent can be expanded and elastically deformed, after the vascular outer stent is arranged on the left renal vein in a sleeving mode, the vascular outer stent can recover and form a tubular structure again, the left renal vein is surrounded, external tissue is expanded and the like, pressure borne by the left renal vein is relieved, and the vascular outer stent can be used for expanding the left renal vein. And the operation is simple and labor-saving, and the external vascular stent is not easy to clamp blood vessels or human tissues, so that the external vascular stent is safe and reliable.

Description

Technical Field

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

[0002] Nutcracker phenomenon, also known as left renal vein compression syndrome, refers to mechanical compression of the left renal vein between the abdominal aorta and superior mesenteric artery, leading to obstruction of venous return and a series of clinical symptoms. The left renal vein normally courses within the angle formed by the abdominal aorta and superior mesenteric artery (normally approximately 45°-60°). If this angle is too narrow (e.g., due to congenital anomalies, emaciation, or spinal hyperextension), the left renal vein may be compressed.

[0003] The treatments for the nutcracker phenomenon usually include conservative treatment and interventional treatment. Interventional treatment is further divided into extravascular stent placement and vascular reconstruction. Extravascular stent placement refers to the installation of an artificial extravascular stent on the outside of the left renal vein to open the compressed vein and restore normal blood flow. There is no need for long-term anticoagulation, which reduces the risk of thrombosis.

[0004] Patent application number CN201506083534 discloses an extravascular stent for relieving compression of the left renal vein and a method for manufacturing the same. The extravascular stent includes a first stent component and a second stent component. The first stent component and the second stent component are combined into a tubular shape. The first stent component and the second stent component are hinged by a hinge axis, and the first stent component is fixed with a first clamping part and a second clamping part at both ends respectively; the second stent component is fixed with a third clamping part and a fourth clamping part at both ends respectively; respectively, the first clamping part can be connected to the third clamping part, and the second clamping part can be connected to the fourth clamping part to form a ring.

[0005] This structure is very complicated to operate. In practice, it is difficult to expand, insert, and close it with a single instrument, which is time-consuming and labor-intensive. In addition, due to the gap between the first and second stent components, when the two rotate relative to each other, they may clamp the left renal vein or surrounding human tissue, posing a certain safety hazard. Summary of the Invention

[0006] In view of this, an object of the present invention is to provide an extravascular stent and a stent assembly that are simple to operate and labor-saving. In addition, the extravascular stent is not likely to clamp blood vessels or human tissues, and is safe and reliable.

[0007] The technical solutions of the present invention are as follows: The present invention provides an extravascular stent, comprising a skeleton and a coating. The skeleton is tubular and can undergo elastic deformation. A mounting opening is provided on one side of the skeleton so that the skeleton can be opened or closed. The coating covers the skeleton and seals the skeleton.

[0008] As an optional solution, an operation notch is provided on at least one side of the installation opening.

[0009] As an optional solution, the operation notches are provided on both sides of the installation opening, and the two operation notches are opposite to each other.

[0010] As an optional solution, an operation window is provided on the frame, and the operation window is close to the installation opening.

[0011] As an optional solution, the skeleton includes two adjacent side bars and a plurality of support bars spaced apart along the side bars, the support bars are annular and have notches, and both ends of the support bars are respectively connected to the two side bars.

[0012] As an optional solution, the skeleton includes a middle portion and two end portions, the middle portion is in a flat tube shape, the two end portions are located at both ends of the middle portion, and the end portions are in a trumpet shape.

[0013] As an optional solution, the skeleton is made of memory metal material.

[0014] The present invention further provides a stent assembly, comprising a mounting mechanism and the above-mentioned extravascular stent, wherein the mounting mechanism is used to expand the extravascular stent.

[0015] As an optional solution, the installation mechanism includes a handle, an outer tube, an expansion member, a pulling member, and a control member. The rear end of the outer tube is connected to the handle, the expansion member is rotatably arranged at the front end of the outer tube and can drive the skeleton to open or close, and the pulling member is slidably arranged in the outer tube and its two ends are respectively connected to the expansion member and the control member.

[0016] As an optional solution, the expansion member includes two mutually hinged monomers, the two monomers are bent outwards, and the front ends of the monomers are provided with barbs, and the barbs are used to hook the two sides of the installation opening.

[0017] The beneficial effects of the present invention are: The stent assembly provided by the present invention includes an installation mechanism for expanding the extravascular stent. The stent is capable of expanding and elastically deforming. After being placed within the left renal vein, the stent regenerates and reforms into a tubular structure, encircling the left renal vein and expanding surrounding tissue. This reduces pressure on the left renal vein and the risk of thrombosis. The stent assembly is simple and labor-saving, and is safe and reliable because it is not likely to clamp blood vessels or human tissue. Furthermore, the stent is very lightweight and does not place significant pressure on blood vessels or other tissues. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. The above and other objects, features and advantages of the present invention will become more apparent through the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings. The drawings are not intentionally scaled to their actual sizes, and the focus is on illustrating the main purpose of the present invention.

[0019] Figure 1 Schematic diagram of the structure of the extravascular stent provided in Example 1 of the present invention Figure 1 ; Figure 2 Schematic diagram of the structure of the extravascular stent provided in Example 1 of the present invention Figure 2 ; Figure 3 Schematic diagram of the structure of the bracket assembly provided in the second embodiment of the present invention Figure 1 ; Figure 4 Schematic diagram of the structure of the bracket assembly provided in the second embodiment of the present invention Figure 2 ; Figure 5 A schematic structural diagram of the mounting mechanism of the bracket assembly provided in the second embodiment of the present invention; Figure 6 This is a schematic diagram of the front-end internal structure of the mounting mechanism of the bracket assembly provided in the second embodiment of the present invention.

[0020] Icons: 10-stent assembly; 11-mounting mechanism; 13-extravascular stent; 110-handle; 111-outer tube; 112-pull member; 113-control member; 120-spreader; 121-unit; 122-hook; 130-skeleton; 131-mounting opening; 132-operating notch; 133-side rod; 134-stent rod; 135-middle part; 136-end part; 140-film. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0025] Example 1: Please refer to Figure 1 、 Figure 2 As shown, the first embodiment of the present invention provides an extravascular stent 13. This extravascular stent 13 is primarily positioned over the left renal vein as an artificial stent to withstand external pressure, prop open the compressed vein, and prevent compression of the left renal vein, restoring normal blood flow without the need for long-term anticoagulation and reducing the risk of thrombosis. In this embodiment, the extravascular stent 13 is used to treat the nutcracker phenomenon, primarily to relieve compression of the left renal vein. Of course, in other embodiments, the extravascular stent 13 can also be applied to other blood vessels.

[0026] The extravascular stent 13 is mainly composed of a skeleton 130 and a coating 140 , and the coating 140 covers the skeleton 130 .

[0027] The skeleton 130 mainly plays a supporting role and is used to bear most of the pressure.

[0028] The skeleton 130 is generally a tubular structure, which may be a circular tube, an elliptical tube, a square tube, etc. In this embodiment, the cross section of the skeleton 130 is an elliptical one, that is, the skeleton 130 is generally a flat tube.

[0029] The skeleton 130 forms a support area in the middle, and the left renal vein can pass through the support area. The support area is relatively closed and can be separated from external blood vessels or tissues. It should be noted that the support area is relatively closed, not absolutely closed.

[0030] The cross-sections of the various parts of the skeleton 130 may be the same, or the following solution may be adopted: the skeleton 130 includes a middle portion 135 and two end portions 136, with the two end portions 136 located at both ends of the middle portion 135. It should be noted that the middle portion 135 and the end portions 136 mentioned here are only approximate areas, not absolute parts.

[0031] The cross-sectional shapes and areas of the middle portion 135 may be the same or different. In this embodiment, the cross-sectional shapes and areas of the middle portion 135 are the same, all of which are elliptical, and the middle portion 135 is in the shape of a flat tube.

[0032] In the direction from close to the middle portion 135 to away from the middle portion 135, the cross-sectional area of ​​the end portion 136 gradually increases, so that the end portion 136 presents a structure that is large on the outside and small on the inside, roughly in the shape of a trumpet. Of course, the trumpet shape here can be slightly flat, that is, the cross-sections of the end portion 136 are all elliptical.

[0033] The skeleton 130 is elastically deformable, that is, it deforms under an external force and returns to its tubular shape when the external force disappears. This can be achieved in any manner. For example, the skeleton 130 can be made of an elastic material such as elastic wire or elastic rubber, or it can be made of memory metal.

[0034] It's important to note that while the frame 130 is capable of elastic deformation, its deformation is not arbitrary. It requires a certain amount of force to deform, allowing it to withstand a certain level of pressure when closed. The material of the frame 130 determines the amount of force required to deform it, which can be set as needed and does not need to be uniform.

[0035] A mounting opening 131 is provided on one side of the frame 130. The location of the mounting opening 131 is not limited. The mounting opening 131 can extend along the centerline of the frame 130 or be positioned at an angle to the centerline. Preferably, the mounting opening 131 extends along the centerline of the frame 130. The mounting opening 131 represents a segmentation of one side of the frame 130 along the centerline of the frame 130, similar to a cut along a generatrix of a circular tube.

[0036] The width of the mounting opening 131 can be set as needed, and can be large or small. The minimum width can be 0, that is, the two sides of the mounting opening 131 abut each other. The width of the mounting opening 131 determines the degree of sealing of the support area of ​​the frame 130. The smaller the width of the mounting opening 131, the stronger the sealing.

[0037] Since the skeleton 130 is disconnected at the mounting opening 131, when medical staff use tools or manually pull the two sides of the mounting opening 131 in opposite directions, the mounting opening 131 of the skeleton 130 can be opened; after loosening the skeleton 130, the skeleton 130 can elastically recover, and the two sides of the mounting opening 131 approach each other and close, so that the skeleton 130 forms a relatively closed tubular shape, effectively surrounding the left renal vein, and the skeleton 130 separates the left renal vein from the outside world, thereby preventing external tissue from exerting pressure on the left renal vein.

[0038] The composition of the skeleton 130 is not limited. For example, in this embodiment, the following scheme can be adopted but not limited to: the skeleton 130 includes two side rods 133 and a plurality of support rods 134. The number of support rods 134 is not limited, for example, it can be four, eight, fifteen, twenty, etc.

[0039] The two side bars 133 are adjacent to each other, and a mounting gap is formed between the two side bars 133 .

[0040] The side bars 133 can be straight, curved, or wavy. The two side bars 133 are preferably of the same shape. This arrangement allows the two side bars 133 to be as close to or in contact as possible, even if the mounting gap is as closed as possible. Of course, in other embodiments, the two side bars 133 may have different shapes.

[0041] Multiple support rods 134 are arranged side by side and spaced apart along the edge rod 133, that is, spaced apart along the extension direction of the mounting notch. A gap exists between any two adjacent support rods 134, and the gap can be large or small, depending on the needs. The support rods 134 are generally ring-shaped with a gap, such as a circular ring or an elliptical ring. Specifically, the support rods 134 are broken at some point to form two adjacent ends 136, and the two ends 136 of the support rods 134 are respectively connected to the edge rod 133.

[0042] The support rod 134 and the side rod 133 may be connected in any manner, such as welding, integral molding, bonding, etc.

[0043] The material of the side rod 133 is not limited, and it can be elastically deformable or not elastically deformable, while the support rod 134 must be elastically deformable. Therefore, the support rod 134 needs to be made of a material that can be elastically deformed or a memory metal. The materials of the side rod 133 and the support rod 134 can be the same or different. When medical staff apply a force to move the two side rods 133 away from each other, the support rod 134 elastically deforms, and at this time, the side rod 133 may not elastically deform; when the applied force is removed, the support rod 134 elastically returns to its original position, so that the two side rods 133 are close to each other and abut each other, thereby closing or substantially closing the installation opening 131.

[0044] In addition, in order to make it easier for medical staff to pry open the skeleton 130, or to facilitate the use of other instruments to assist in prying open the skeleton 130, in this embodiment, the following technical solution can also be adopted: an operating notch 132 is provided on the skeleton 130, and the operating notch 132 is provided at the installation opening 131.

[0045] The configuration of the operating notch 132 is not limited. For example, the middle portion of one of the side bars 133 is recessed or disconnected in a direction away from the other side bar 133 to form a gap.

[0046] The number and location of the access notches 132 can be determined as needed. For example, the access notches 132 can be provided only on one side of the mounting opening 131, or on both sides of the mounting opening 131. If the access notches 132 are provided on both sides of the mounting opening 131, the two access notches 132 can be positioned opposite each other, forming a window for facilitating the insertion of other instruments. Of course, the two access notches 132 can also be staggered, and the access notches 132 can be located in the middle of the mounting opening 131 or toward one end.

[0047] When the frame 130 is closed, the operating notch 132 at the mounting opening 131 forms an open window. Medical staff can easily insert auxiliary equipment into the window and force the two side rods 133 outward without having to insert fingers or equipment into the narrow mounting opening 131. The operation is simple and convenient.

[0048] Of course, in other embodiments, the operation gap 132 may not be provided, or the operation gap 132 may be replaced by an operation window. The difference between the operation window and the operation gap 132 is that one side of the operation gap 132 is open, while the operation window is not open.

[0049] The covering 140 is used to fill the gaps in the skeleton 130 , which can both disperse the pressure of the skeleton 130 and increase the stability of the skeleton 130 , while isolating external tissues from contacting the left renal vein through the gaps in the skeleton 130 .

[0050] The material of the covering film 140 is not limited, such as a rubber film, a flexible plastic film, etc. The production method of the covering film 140 is also not limited, such as injection molding, thermoplastic molding, or adhesive fixation.

[0051] The thickness of the coating 140 can be set as needed, for example, 0.01 mm, 0.1 mm, 0.03 mm, etc.

[0052] The method of using the extravascular stent 13 provided in this embodiment is as follows: The medical staff inserts a finger or an instrument into the operating notch 132 and pries it outward with force, thereby opening the installation opening 131 of the extravascular stent 13; The extravascular stent 13 is placed at the left renal vein, ensuring that the left renal vein enters the support area; The medical staff releases their hands or resets the device. At this time, the skeleton 130 returns to its tubular shape under its own elasticity and surrounds the left renal vein. The number of extravascular stents 13 to be used can be determined as needed. If there are multiple stents, the above steps are performed sequentially. A portion of the left renal vein is in a relatively closed environment. External blood vessels or tissues cannot release the left renal vein in the support area. The extravascular stent 13 shares most of the pressure, thereby relieving the pressure on the left renal vein and restoring blood flow.

[0053] The above steps can be increased, decreased, modified, or the order can be adjusted as needed.

[0054] Example 2: Please refer to Figure 3 、 Figure 4 As shown, the second embodiment of the present invention provides a stent assembly 10 , which includes a mounting mechanism 11 and an extravascular stent 13 .

[0055] It should be noted that the terms "front" and "back" in this embodiment are artificially defined. For example, the end closest to the lesion is the "front," or "proximal," while the end farther from the lesion is the "back," or "distal." These directional terms are used solely to describe the relative positions of the components of the stent assembly 10 and do not represent absolute positions.

[0056] The structure of the extravascular stent 13 can refer to the solution in the first embodiment and will not be described in detail here.

[0057] The mounting mechanism 11 mainly plays an auxiliary role. The mounting mechanism 11 can be used in conjunction with the extravascular stent 13 to open and close the extravascular stent 13. It should be noted that the extravascular stent 13 can also be produced, manufactured, and used independently.

[0058] The mounting mechanism 11 and the extravascular stent 13 are split structures, that is, the mounting mechanism 11 is only needed when the extravascular stent 13 needs to be placed on the left renal vein or the extravascular stent 13 placed on the left renal vein needs to be removed; when the extravascular stent 13 is installed or removed, the mounting mechanism 11 can be removed from the extravascular stent 13.

[0059] The structure of the mounting mechanism 11 is not limited, as long as it can expand the extravascular stent 13 .

[0060] In this embodiment, you can refer to but not be limited to the following solutions: Figure 5 、 Figure 6 As shown, the installation mechanism 11 mainly consists of a handle 110 , an outer tube 111 , a spreading member 120 , a pulling member 112 and a control member 113 .

[0061] The handle 110 mainly plays a supporting role and can be used for medical staff to hold, and medical staff can operate through the handle 110. The structure of the handle 110 is not limited and can refer to the existing technology. For example, the handle 110 can be cylindrical, prismatic, irregular, etc.

[0062] The rear end of the outer tube 111 is connected to the handle 110. The shape of the outer tube 111 is not limited and can be tubular, rod-shaped, etc. The outer tube 111 generally adopts a tubular structure, such as a round tube, square tube, flat tube, irregular tube, etc. Its length can be set as needed and can be long or short.

[0063] The expansion member 120 is located at the front end of the outer tube 111 and can drive the frame 130 to open or close. The structure of the expansion member 120 is not limited. For example, in this embodiment, the expansion member 120 includes two units 121, which are hinged to each other via a hinge axis, and the hinge axis of the two units 121 is fixed to the outer tube 111.

[0064] The shape and structure of the monomers 121 are not limited. The two monomers 121 are bent outward, and the shape is not limited, such as a circular arc, an elliptical arc, a rectangle, a J-shape, etc. The openings of the two monomers 121 are opposite each other, and a clearance zone is formed between the two monomers 121. The extravascular stent 13 can be placed in the clearance zone. Generally speaking, the shape of the clearance zone is preferably matched with the shape of the extravascular stent 13. For example, if the extravascular stent 13 is a flat tube, the shape of the clearance zone is also an ellipse slightly larger than the extravascular stent 13. Such a configuration can ensure that the extravascular stent 13 does not move around. Of course, the shape of the clearance zone can also be different from the shape of the extravascular stent 13. In this case, it is necessary to ensure that a certain position of the two monomers 121, such as the middle or the hinge, can abut the extravascular stent 13.

[0065] The front end of the monomer 121 is provided with a barb 122, which retracts backwards and can be inserted into the operating notch 132 when the expansion member 120 is located outside the extravascular stent 13. Therefore, the depth of the barb 122 should not be too large, preferably being able to be inserted into or out of the operating notch 132.

[0066] It should be noted that the structure of the barbs 122 must meet the following requirements: when the expansion member 120 is closed, the stent 13 has sufficient room to maneuver within the escape zone. Specifically, the escape zone must be longer than the stent 13's width (from the access notch 132 to the other side of the stent 13), but the difference between the two should not be too large, as this would easily cause the stent 13 to wobble. This configuration ensures that the barbs 122 can be inserted into and removed from the access notch 132 when the expansion member 120 is closed.

[0067] When the two monomers 121 rotate, their front ends can open or close, thereby opening or closing the avoidance zone: when the avoidance zone is opened, the distance between the front ends of the two monomers 121 is larger, and the extravascular stent 13 can enter the avoidance zone through between the front ends of the two monomers 121, or leave the avoidance zone through between the front ends of the two monomers 121; when the avoidance zone is closed, the distance between the front ends of the two monomers 121 is smaller, and the barb 122 of the monomer 121 can be inserted into the operating notch 132, and under the action of external force, the two monomers 121 are opened outward, and the monomer 121 can drive the extravascular stent 13 to open.

[0068] The pulling member 112 is mainly used to control the movement of the expansion member 120, that is, to control the opening or closing of the expansion member 120. The style and installation method of the pulling member 112 are not limited. For example, in this embodiment, the following solutions can be adopted but are not limited to: the pulling member 112 includes a pulling rod and two connecting rods.

[0069] The two connecting rods are hinged to the front end of the pulling rod, and the two connecting rods are hinged to the rear ends of the two monomers 121 respectively. The two connecting rods and the parts from the rear ends of the two monomers 121 to the hinge axis form a four-bar linkage mechanism or a parallel four-bar linkage mechanism. When the pulling rod slides back and forth along the outer tube 111, it can drive the four-bar linkage mechanism or the parallel four-bar linkage mechanism to move, thereby making the two monomers 121 of the expansion member 120 open or close.

[0070] The control member 113 may be provided on the handle 110 and is mainly used for medical personnel to control the pulling rod to slide forward and backward.

[0071] The style of the control member 113 is not limited. In this embodiment, the control member 113 can adopt but is not limited to the following solutions: the control member 113 includes a scissor-type handle, and the scissor-type handle includes two handles hinged to each other.

[0072] The two handles are hinged to each other through a hinge axis. Generally speaking, one of the handles is a fixed handle and the other is a movable handle. The fixed handle is fixedly connected to the handle 110, and one end of the movable handle is connected to the rear end of the pulling member 112. The connection method is not limited, as long as the pulling member 112 can be pulled back and forth when the movable handle is rotated.

[0073] A reset spring can be set between the fixed handle and the movable handle to make the two have a tendency to reset. The reset spring can be a tension spring, a compression spring, a torsion spring, etc. Of course, no reset spring is set between the two, and manual reset by medical staff is also possible.

[0074] For example, a T-shaped slot is provided at one end of the movable handle, and the T-shaped slot is set at an angle to the radial direction of the pulling rod. The angle is not limited. A pulling head is provided at the rear end of the pulling rod. The rear end of the pulling rod passes through the opening of the T-shaped slot and the pulling head is slidably embedded in the T-shaped slot.

[0075] When the two handles rotate relative to each other, the T-slot can pull the pulling head back and forth. During this process, the pulling head slides in the T-slot, and the angle between the axial direction of the pulling rod and the T-slot changes, that is, the T-slot and the pulling rod rotate relative to each other. Therefore, it is necessary to avoid interference. Therefore, the pulling head can be set into a spherical structure, or the internal space of the T-slot is larger than the size of the pulling head, so that the pulling head can rotate in the T-slot.

[0076] In other embodiments, the movable handle and the rear end of the pulling member 112 can also be coordinated through a gear rack mechanism. Specifically, the gear rack mechanism includes a gear and a rack. The gear is coaxially fixed with the movable handle. The movable handle can drive the paper wheel to rotate. The rack is arranged at the rear end of the pulling rod and extends in the front and rear directions. The gear and the rack are meshed. When the gear rotates, it can drive the rack to move forward and backward.

[0077] The method of using the extravascular stent 13 provided in this embodiment is as follows: The medical staff pinches the two handles and rotates them relative to each other. The movable handle pulls the pulling rod backward, and the pulling rod drives the expansion member 120 to open. Placing the expanded expansion member 120 outside the extravascular stent 13; The medical staff releases their hands and the reset spring resets the two handles, or the medical staff manually resets the two handles. At this time, the pulling rod is pushed forward, the expansion member 120 is closed, and the expansion member 120 can be moved slightly to insert the barb 122 into the operating notch 132, and the barb 122 hooks the operating notch 132; The medical staff pinches the two handles and rotates them relative to each other. The movable handle pulls the pulling rod backward, and the pulling rod drives the expansion member 120 to open, thereby driving the extravascular stent 13 to open. The extravascular stent 13 is placed at the left renal vein, ensuring that the left renal vein enters the support area; The medical staff moves the expansion member 120 slightly to disengage the barb 122 from the operating notch 132, then pinches the two handles to rotate them relative to each other. The movable handle pulls the pulling rod backward, and the pulling rod drives the expansion member 120 to open. The mounting mechanism 11 is taken out.

[0078] The above steps can be increased, decreased, modified, or the order can be adjusted as needed.

[0079] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An extravascular stent, characterized in that: The invention comprises a frame and a covering film. The frame is tubular and can undergo elastic deformation. A mounting opening is provided on one side of the frame so that the frame can be opened or closed. The covering film covers the frame and seals the frame.

2. The extravascular stent according to claim 1, characterized in that: An operation notch is provided on at least one side of the installation opening.

3. The extravascular stent according to claim 2, characterized in that: The operation notches are provided on both sides of the installation opening, and the two operation notches are opposite to each other.

4. The extravascular stent according to claim 1, characterized in that: An operation window is provided on the frame, and the operation window is close to the installation opening.

5. The extravascular stent according to claim 1, characterized in that: The skeleton includes two adjacent side bars and a plurality of support bars spaced apart along the side bars. The support bar is annular and has a notch. Both ends of the support bar are respectively connected to the two side bars.

6. The extravascular stent according to claim 1, characterized in that: The skeleton includes a middle portion and two end portions, the middle portion is in a flat tube shape, the two end portions are located at both ends of the middle portion, and the end portions are in a trumpet shape.

7. The extravascular stent according to claim 1, characterized in that: The frame is made of memory metal material.

8. A bracket assembly, characterized in that: It comprises a mounting mechanism and the extravascular stent according to any one of claims 1 to 7, wherein the mounting mechanism is used to expand the extravascular stent.

9. The bracket assembly according to claim 8, characterized in that The mounting mechanism includes a handle, an outer tube, a spreading member, a pulling member, and a control member. The rear end of the outer tube is connected to the handle. The spreading member is rotatably arranged at the front end of the outer tube and can drive the skeleton to open or close. The pulling member is slidably arranged in the outer tube and its two ends are respectively connected to the spreading member and the control member.

10. The bracket assembly according to claim 9, wherein: The support member includes two mutually hinged monomers, the two monomers are bent outwards, and the front ends of the monomers are provided with barbs, which are used to hook the two sides of the installation opening.

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