Covered stent, intravascular implantation assembly and conveying system

Abstract

The utility model belongs to the technical field of medical instruments, and relates to a covered stent, an intravascular implantation assembly and a conveying system. The covered stent comprises a stent body and a filling pipe arranged in the stent body, a filling channel is formed in the filling pipe, and an inner cavity of the stent body is communicated with the outer side of the stent body through the filling channel; the covered stent conveying system comprises a covered stent and a covered stent conveyor used for conveying the covered stent. The intravascular implantation assembly comprises a covered stent and a hemangioma cavity implant; the intravascular implant assembly conveying system comprises an intravascular implant assembly and an implant assembly conveyor used for conveying the intravascular implant assembly. Compared with the prior art, the filling channel is reserved in the covered stent, after the covered stent is implanted, the hemangioma cavity implant can be conveyed into the hemangioma cavity through the filling channel so as to fill the hemangioma cavity, operation difficulty and operation risks are reduced, and safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and relates to a covered stent, an intravascular implant assembly and a delivery system. BACKGROUND

[0002] One of the main treatment methods for existing hemangioma lesions, such as aneurysm lesions, is endoluminal repair (EVAR), which uses a covered stent implanted at the hemangioma to isolate the aneurysm neck using a high-molecular-membrane film, thereby avoiding blood flow impacting the aneurysm wall and causing the aneurysm to rupture. The original aneurysm cavity is occluded by the covered stent, so that no blood flow enters the cavity, and thrombosis is formed in the cavity, thereby achieving the purpose of treatment. However, in actual surgery, due to the difference in the shape of the aneurysm neck, the contact part between the covered stent and the aneurysm neck often cannot be effectively occluded, resulting in a certain "internal leakage" effect, thereby causing the aneurysm to recur again.

[0003] To prevent such recurrence, during the covered stent implantation surgery, the doctor usually adopts a method of filling the aneurysm cavity with a spring coil, biological glue or other implants, so as to form a certain filling and thrombosis effect in the aneurysm cavity, thereby greatly reducing the probability of aneurysm recurrence. However, this surgical operation process is very complex. The covered stent often needs to be kept in a semi-released state, then a microcatheter is inserted into the aneurysm cavity through the gap between the blood vessel wall and the covered stent in the semi-released state, the microcatheter is used to fill the implant into the aneurysm cavity, the covered stent is completely released to keep the implant in the aneurysm cavity, and finally the microcatheter is withdrawn from the gap between the blood vessel wall and the completely released covered stent. However, since the covered stent is completely released, the microcatheter is clamped by the blood vessel wall and the completely released covered stent. During the microcatheter withdrawal process, the covered stent closely attached to the microcatheter is easily moved, resulting in problems such as poor adhesion, and thus causing clinical adverse events.

[0004] To avoid the above problems, a method of separately operating the implantation of the covered stent and the filling of the aneurysm cavity implant is also used, that is, the implantation of the covered stent at the aneurysm is first completed, then under the guidance of ultrasound, a syringe is used to directly puncture from the outside of the patient's body into the aneurysm cavity, and the implant is injected into the aneurysm for filling. However, this operation requires high operation requirements of the doctor, the puncture distance is long, is easily affected by the patient's abdominal organs, and has the risk of implant missing in the abdominal cavity. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a covered stent, an assembly and a system, which can effectively occlude the aneurysm, reduce the operation difficulty and improve the safety.

[0006] The utility model can be realized by the following technical solutions.

[0007] The first aspect of this utility model provides a film-coated stent, which includes a stent body and a filling tube disposed within the stent body. The filling tube has a filling channel, and the inner cavity of the stent body is connected to the outer side of the stent body through the filling channel.

[0008] Preferably, the support body contains one or more filling tubes; the inner diameter of the filling tube is 0.1-50 mm, and the length is 1-300 mm; the filling tube includes an inner layer and an outer layer fixedly connected to the inner layer; the material of the inner layer includes one or more of nickel-titanium alloy, cobalt-chromium alloy, cobalt-chromium-nickel alloy, and polymer materials, and the material of the outer layer includes one or more of PET, ePTFE, PTFE, and FEP; or the material of the outer layer includes one or more of nickel-titanium alloy, cobalt-chromium alloy, cobalt-chromium-nickel alloy, and polymer materials, and the material of the inner layer includes one or more of PET, ePTFE, PTFE, and FEP.

[0009] Preferably, one end of the filling tube is provided with a filling channel inlet end and the other end is provided with a filling channel outlet end, and the side wall of the support body is provided with a side wall opening adapted to the filling channel outlet end, and the filling channel outlet end is fixedly connected to the side wall of the support body.

[0010] Preferably, one end of the stent body is provided with a blood flow inlet end, and the filling channel inlet end faces a direction away from the blood flow inlet end.

[0011] Preferably, a support fixing part is provided at the blood inlet end.

[0012] Preferably, a filling channel development mark is provided at the inlet end of the filling channel.

[0013] Preferably, the outlet end of the filling channel is provided with an opening and closing component adapted to the outlet end of the filling channel. The opening and closing component includes two or more elastic membranes, and the material of the elastic membranes includes one or more of PET, ePTFE, PTFE, and FEP.

[0014] Preferably, the outlet end of the filling channel is fixedly connected to the side wall of the support body by a suture; the filling tube is also provided with at least one filling tube fixing assembly, the filling tube fixing assembly includes a fixing ring disposed on the outside and / or inside of the filling tube and fixedly connected to the filling tube and a fixing line, the fixing ring being fixedly connected to the side wall of the support body through the fixing line; the material of the fixing ring includes one or more of PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, and platinum-tungsten alloy, and the material of the fixing line includes one or more of PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, and platinum-tungsten alloy.

[0015] Preferably, the stent body includes a stent main segment and one or more stent branch segments; the stent main segment and / or the stent branch segments include a membrane and a plurality of support frames fixedly connected to the membrane, the support frames being located inside and / or outside the membrane; the support frames include a wave-shaped annular metal wire and a connecting tube adapted to the metal wire, the first and last ends of the metal wire being fixedly connected through the connecting tube; the stent main segment and / or the stent branch segments are provided with stent imaging marks; the filling tube is disposed within the stent main segment and / or the stent branch segments; the stent main... The body segment and the branch segment of the support, as well as the support skeleton and the covering membrane, are all fixedly connected by sutures; the material of the covering membrane includes one or more of PET, ePTFE, PTFE, and FEP; the material of the metal wire includes one or more of nickel-titanium alloy, cobalt-chromium alloy, and cobalt-chromium-nickel alloy; the material of the connecting tube includes one or more of 316L stainless steel, nickel-titanium alloy, platinum-iridium alloy, platinum-tungsten alloy, and tan; and the material of the suture includes one or more of PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, and platinum-tungsten alloy.

[0016] Preferably, the filling tube is provided with a guidewire and / or microcatheter that is adapted to and removable from the filling channel.

[0017] The second aspect of this utility model provides a coated stent delivery system, the coated stent delivery system including the coated stent and a coated stent conveyor for delivering the coated stent.

[0018] The third aspect of this utility model provides an intravascular implantation component, which includes the covered stent and the aneurysm cavity implant.

[0019] Preferably, the hemangioma cavity implant is adapted to the filling channel, and the hemangioma cavity implant includes one or more of spring coils, bio-adhesive, and liquid embolizing agents.

[0020] The fourth aspect of this utility model provides an intravascular implantable component delivery system, the intravascular implantable component delivery system including the intravascular implantable component and an implantable component delivery device for delivering the intravascular implantable component.

[0021] Compared with the prior art, this utility model has the following characteristics:

[0022] (1) By reserving a filling channel inside the covered stent, after the covered stent is implanted, the filling channel can be used to transport the implant into the hemangioma cavity to fill the hemangioma cavity. This can effectively block the hemangioma and avoid problems such as displacement or poor wall adhesion of the covered stent, and leakage of the implant into the abdominal cavity. This reduces the difficulty of operation and surgical risk and improves safety.

[0023] (2) By setting up a filling tube, it is not only convenient for doctors to position the guide wire, but also avoids the high-pressure blood flow in the stent body from directly impacting the opening and closing components at the outlet end of the filling channel, which could lead to damage and tearing of the opening and closing components, displacement of the implant in the aneurysm cavity, etc., and effectively avoids the secondary "internal leakage" effect.

[0024] (3) By setting the inlet end of the filling channel to face away from the inlet end of the blood flow, the high-pressure blood flow flowing into the covered stent from the inlet end of the blood flow directly enters the hemangioma through the filling channel, which further reduces the risk of hemangioma rupture.

[0025] (4) An opening and closing component is provided at the outlet end of the filling channel, and the opening and closing component is in the form of an elastic membrane to form a structure similar to a "curtain". When the guide wire and / or microcatheter passes through, the outlet end of the filling channel is in an open state. When the guide wire and / or microcatheter is withdrawn, the outlet end of the filling channel closes naturally to block the implant that has been filled in the hemangioma cavity and prevent it from returning to the filling channel through the outlet end of the filling channel.

[0026] (5) The filling tube is fixedly connected to the side wall of the stent body by the filling tube fixing assembly, which avoids the high pressure blood flow in the covered stent from impacting the filling tube and causing the filling tube to move or shake, thereby affecting the positioning of the guide wire when the doctor operates and the smooth filling of the aneurysm cavity implant. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the front view of the covered scaffold in Example 1;

[0028] Figure 2 This is a side view of the covered stent structure in Example 1;

[0029] Figure 3 for Figure 2 A partially enlarged schematic diagram of the filling tube;

[0030] Figure 4 This is a schematic diagram of the supporting skeleton in Example 1;

[0031] Figure 5 This is a schematic diagram of the structure of the covered stent implanted in the hemangioma in Example 1;

[0032] Explanation of markings in the diagram:

[0033] 1—Stent body, 2—Filling tube, 3—Filling channel inlet end, 4—Filling channel outlet end, 5—Blood flow inlet end, 6—Stent fixation part, 7—Filling channel radiopaque marker, 8—Elastic membrane, 9—Fixation ring, 10—Fixation suture, 11—Stent body segment, 12—Stent branch segment, 13—Covering membrane, 14—Supporting skeleton, 15—Metal wire, 16—Connecting tube, 17—Stent radiopaque marker, 18—Guide wire, 19—Microcatheter, 20—Abdominal aorta, 21—Abdominal aortic aneurysm, 22—Right iliac artery, 23—Left iliac artery. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0035] It should be noted that the terminology used in this utility model is for the purpose of describing specific embodiments only and is not intended to limit the utility model.

[0036] In this invention, the singular forms “a,” “the,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0037] In this invention, the term "and / or" as used refers to any or all possible combinations of one or more associated listed items. The term "or" is generally used to include the meaning of "and / or" unless otherwise expressly stated in the content.

[0038] In this utility model, unless otherwise stated, "multiple" means two or more (i.e., two or more), and "several" means that the quantity is not limited.

[0039] In this invention, although terms such as first, second, third, etc., may be used to describe various features, these features should not be limited to these terms, which are only used to distinguish features of the same type from each other. For example, without departing from the scope of this invention, a first feature may also be referred to as a second feature, and similarly, a second feature may also be referred to as a first feature.

[0040] In this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In this invention, unless otherwise specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, internal connections between two components, direct connections, or indirect connections via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms according to the specific circumstances.

[0042] In this invention, the use of suffixes such as "module," "component," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. For example, "module" and "component" can be used interchangeably.

[0043] In this invention, for ease of description, terms such as "remote end" and "proximal end" may be used. "Remote end" refers to the side away from the equipment operator, while "proximal end" refers to the side closer to the equipment operator.

[0044] Furthermore, to avoid confusion with this utility model, some technical features known in the art have not been described.

[0045] This utility model provides a film-coated support, such as Figure 1 , Figure 2 As shown, the covered stent includes a stent body 1 and a filling tube 2 disposed within the stent body 1. The filling tube 2 has a filling channel, and the inner cavity of the stent body 1 is connected to the outer side of the stent body 1 through the filling channel. The filling tube 2 is pre-installed within the stent body 1, connecting the inner and outer sides of the stent body 1. When the covered stent is fully released within the blood vessel, the aneurysm implant can be delivered from the inner side of the stent body 1 through the filling channel into the aneurysm cavity to fill the aneurysm, without first maintaining the covered stent in a partially released state.

[0046] Preferably, the stent body 1 contains one or more filling tubes 2. The number and reasonable distribution of filling tubes 2 are determined according to the location, size, and number of hemangiomas.

[0047] Preferably, the inner diameter of the filling tube 2 is 0.1-50mm and the length is 1-300mm. The filling tube 2 must match the size of the stent body 1, and cannot be too thick or too long, while also ensuring that the implanted material in the aneurysm cavity can be smoothly delivered through the filling channel.

[0048] Preferably, the filling tube 2 includes an inner layer and an outer layer fixedly connected to the inner layer; the inner layer is made of one or more of the following materials: nickel-titanium alloy, cobalt-chromium alloy, cobalt-chromium-nickel alloy, and polymer materials; the outer layer is made of one or more of the following materials: PET (polyethylene terephthalate), ePTFE (expanded polytetrafluoroethylene), PTFE (polytetrafluoroethylene), and FEP (fluorinated ethylene propylene copolymer); or the outer layer is made of one or more of the following materials: nickel-titanium alloy, cobalt-chromium alloy, cobalt-chromium-nickel alloy, and polymer materials; the inner layer is made of one or more of the following materials: PET, ePTFE, PTFE, and FEP. The filling tube 2 is configured as a double-layer structure, one layer is used to form the filling channel, and the other layer is used to maintain the shape of the filling channel (e.g., to support the filling channel). The materials and functions of the inner and outer layers can be interchanged; the filling channel can be formed by the inner layer or by the outer layer.

[0049] Preferably, the filling tube 2 has a filling channel inlet end 3 at one end and a filling channel outlet end 4 at the other end. The side wall of the stent body 1 has a side wall opening adapted to the filling channel outlet end 4, and the filling channel outlet end 4 is fixedly connected to the side wall of the stent body 1. More preferably, the filling channel outlet end 4 is located on the side wall of the stent body 1 and has the same shape and size as the side wall opening of the stent body 1 (i.e., a perfect match). When delivering the hemangioma cavity implant, the hemangioma cavity implant enters the filling tube 2 through the filling channel inlet end 3, and then leaves the covered stent through the filling channel outlet end 4 and enters the hemangioma cavity.

[0050] Preferably, one end of the stent body 1 is provided with a blood flow inlet end 5, and the filling channel inlet end 3 faces away from the blood flow inlet end 5. Blood flow in the blood vessel enters the stent body 1 through the blood flow inlet end 5 and flows along the axial direction of the stent body 1. Since the filling channel inlet end 3 faces away from the blood flow inlet end 5, blood flow in the stent body 1 is prevented from flowing directly into the filling tube 2 through the filling channel inlet end 3.

[0051] Preferably, a stent fixation part 6 is provided at the blood inlet end 5. The stent fixation part 6 may adopt a barb or outward expansion structure, so that after the covered stent is implanted into the blood vessel, the stent fixation part 6 can maintain the position of the covered stent and prevent the covered stent from migrating in the long term.

[0052] Preferably, a filling channel imaging mark 7 is provided at the inlet end 3 of the filling channel. The filling channel imaging mark 7 can play a guiding role when filling the hemangioma cavity with implants.

[0053] Preferably, such as Figure 3 As shown, the outlet end 4 of the filling channel is provided with an opening and closing component adapted to the outlet end 4 of the filling channel. The opening and closing component includes two or more elastic membranes 8, and the elastic membranes 8 are made of one or more of PET, ePTFE, PTFE, and FEP. The two or more elastic membranes 8 can be spliced ​​together to cooperate with each other, so that the outlet end 4 of the filling channel can be naturally closed when no force is applied, and the outlet end 4 of the filling channel can be opened when force is applied to facilitate the filling of the hemangioma cavity implant.

[0054] Preferably, the outlet end 4 of the filling channel is fixedly connected to the side wall of the support body 1 by a suture; the filling tube 2 is also provided with at least one filling tube fixing assembly, which includes a fixing ring 9 disposed on the outside and / or inside of the filling tube 2 and fixedly connected to the filling tube 2, and a fixing line 10. The fixing ring 9 is fixedly connected to the side wall of the support body 1 through the fixing line 10. The filling tube 2 is fixedly connected to the support body 1 near its end, and the filling tube fixing assembly is added at other positions of the filling tube 2 to further fix it to the support body 1, forming a multi-point fixing method to ensure that the connection of the filling tube 2 is stable.

[0055] Preferably, the material of the fixing ring 9 includes one or more of PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, and platinum-tungsten alloy, and the material of the fixing wire 10 includes one or more of PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, and platinum-tungsten alloy.

[0056] Preferably, the stent body 1 includes a stent main segment 11 and one or more stent branch segments 12. The stent body 1 may consist only of the stent main segment 11 (i.e., the number of stent branch segments 12 is 0), or it may have one, two or more stent branch segments 12 on the stent main segment 11. The lengths of different stent branch segments 12 may be equal or unequal, for example, they may be long-leg branches and short-leg branches respectively.

[0057] Preferably, the main body segment 11 and / or the branch segment 12 of the stent include a membrane 13 and a plurality of support frames 14 fixedly connected to the membrane 13, the support frames 14 being located inside and / or outside the membrane 13. The filling tube 2 is preferably fixedly connected to the membrane 13.

[0058] Preferably, such as Figure 4 As shown, the support frame 14 includes a metal wire 15 arranged in a wave-like loop and a connecting pipe 16 adapted to the metal wire 15. The first and last ends of the metal wire 15 are fixedly connected by the connecting pipe 16.

[0059] Preferably, the stent body section 11 and / or stent branch section 12 are provided with stent imaging marks 17. The stent imaging marks 17 can serve as guides and for docking and positioning.

[0060] Preferably, the filling tube 2 is disposed within the main body section 11 and / or the branch section 12 of the stent. The filling tube 2 may be disposed only within the main body section 11 or the branch section 12 of the stent, or the required number of filling tubes 2 may be disposed in the main body section 11 and the multiple branch sections 12 of the stent respectively.

[0061] Preferably, the main body segment 11 and the branch segment 12 of the support, as well as the support frame 14 and the covering membrane 13, are fixedly connected by sutures.

[0062] Preferably, the material of the coating 13 includes one or more of PET, ePTFE, PTFE, and FEP; the material of the metal wire 15 includes one or more of nickel-titanium alloy, cobalt-chromium alloy, and cobalt-chromium-nickel alloy; the material of the connecting tube 16 includes one or more of 316L stainless steel, nickel-titanium alloy, platinum-iridium alloy, platinum-tungsten alloy, and tan; and the material of the suture includes one or more of PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, and platinum-tungsten alloy.

[0063] Preferably, such as Figure 5 As shown, the filling tube 2 is provided with a removable guidewire 18 and / or microcatheter 19 adapted to the filling channel. At least one of the guidewire 18 or microcatheter 19 can be pre-inserted in the covered stent to facilitate rapid positioning and filling of the aneurysm cavity implant after the covered stent is fully released.

[0064] This invention also provides a covered stent delivery system, which includes the aforementioned covered stent and a covered stent delivery device for delivering the covered stent. The covered stent can be pre-assembled in the covered stent delivery device to form the covered stent delivery system. In use, the covered stent is delivered to the aneurysm via the covered stent delivery device and then released.

[0065] This invention also provides an intravascular implantation component, which includes the aforementioned covered stent and aneurysm cavity implant. The covered stent and aneurysm cavity implant can be combined and used together. In use, the covered stent is first delivered to the aneurysm and released, and then the aneurysm cavity implant is delivered into the aneurysm cavity for filling through the filling channel on the covered stent.

[0066] Preferably, the hemangioma cavity implant is adapted to the filling channel, and the hemangioma cavity implant includes one or more of coils, bio-adhesive, and liquid embolizing agents. Various common types of hemangioma cavity implants can be used, as long as they can be delivered through the filling channel.

[0067] This invention further provides an intravascular implantable component delivery system, which includes the aforementioned intravascular implantable component and an implantable component delivery device for delivering the intravascular implantable component. The implantable component delivery device can be an integral structure, or a split or combined structure, to deliver covered stents and aneurysm cavity implants separately.

[0068] This invention pre-designs one or more filling tubes 2 inside the covered stent to fill the hemangioma cavity with implanted material after the covered stent is implanted. This solves the problems of stent displacement and poor stent adhesion to the blood vessel wall caused by filling the hemangioma cavity with implanted material first and then completely releasing the covered stent, as well as the risk of implanted material being left in the abdominal cavity when directly puncturing the hemangioma cavity from outside the patient and injecting the implanted material to fill the hemangioma.

[0069] Example 1:

[0070] Currently, the incidence of aneurysms remains high, with a mortality rate as high as 90%. Conventional surgical treatment involves significant trauma, which is extremely detrimental to patient recovery. With the development of endovascular repair techniques, new methods have emerged for aneurysm treatment, with covered stent grafting being the current mainstream technique. In this procedure, the stent is made of nickel-titanium alloy wire or other metal materials, and its surface is sutured with a polymer membrane. The entire covered stent is installed within a delivery catheter. During the procedure, an artery is first punctured, then the covered stent is delivered to the aneurysm site under guidance, and finally released. The length of the covered stent completely covers the length of the aneurysm. Because of the polymer membrane on the stent, arterial blood flow is blocked, preventing blood from impacting the aneurysm wall and forming a closed cavity, allowing for arterial remodeling and achieving the therapeutic goal. However, in covered stent grafting, approximately 35% of cases experience a "leakage" effect due to ineffective aneurysm closure, leading to aneurysm recurrence.

[0071] Based on this, this embodiment provides a coated stent with a pre-filled function. For example... Figure 1 , Figure 2 As shown, the stent body 1 includes a main stent segment 11 and two branch stent segments 12 (a long-leg branch and a short-leg branch, respectively). Both the main stent segment 11 and the branch stent segments 12 include multiple support frames 14, and a polymer film 13 is applied to the outer or inner surface of each support frame 14. The support frames 14 and the film 13 are fixed together by sutures. The main stent segment 11 and the branch stent segments 12 are also fixed together by sutures between the film 13. The film 13 can be made of PET, ePTFE, PTFE, or FEP, etc., and the sutures can be made of PET, ePTFE, PTFE, FEP, etc. Figure 4As shown, the support frame 14 is formed by weaving and heat treatment, and is connected to the metal wire 15 by the connecting pipe 16 and fixed by welding. The metal wire 15 can be made of nickel-titanium alloy, cobalt-chromium alloy, cobalt-chromium-nickel alloy, etc., and the connecting pipe 16 can be made of 316L stainless steel, nickel-titanium alloy, platinum-iridium alloy, platinum-dip alloy, tank steel, etc.

[0072] The stent body 1 contains a filling tube 2, which has a filling channel. One end of the filling channel is fixed to the stent body 1, and the opening of the other end faces the same direction as the opening of the short-leg branch. The filling tube 2 has a filling channel imaging mark 7, which acts as an imaging marker during the filling process after the covered stent is implanted, facilitating the guidance of the guide wire 18 into the filling channel. The short-leg branch has a stent imaging mark 17, which serves as a guide and docking positioning marker when a single covered stent is implanted again.

[0073] The filling tube 2 adopts a double-layer structure. One layer can be a metal braided structure, made of materials such as nickel-titanium alloy, cobalt-chromium alloy, or cobalt-chromium-nickel alloy; it can also be made of a metal-free, single-material polymer. The other layer is made of a polymer material, such as PET, ePTFE, PTFE, or FEP. The inner diameter of the filling tube 2 ranges from 0.1 to 50 mm, and the length ranges from 1 to 300 mm. The placement of the filling tube 2, besides... Figure 1 It can be set in the short leg branch as in the example, or it can be set in the long leg branch, or in the main body section 11 of the support. Multiple filling tubes 2 can also be set in one covered support, that is, the number of filling tubes 2 is ≥1.

[0074] like Figure 3 As shown, the outlet end 4 of the filling channel is provided with two elastic membranes 8, forming an opening and closing assembly. The elastic membranes 8 can be made of polymer materials, such as PET, ePTFE, PTFE, FEP, etc. The outlet end 4 of the filling channel is circumferentially sutured to the covering membrane 13. The sutures can be made of polymer materials or metals (such as platinum-iridium alloy, platinum-dipole alloy, etc.). An openable slit is formed between the two elastic membranes 8. When the guidewire 18 and microcatheter 19 pass through, the slit becomes open; when the guidewire 18 and microcatheter 19 are retracted, the slit closes naturally, forming a "curtain" effect. The number of elastic membranes 8 can also be greater to form multiple slits. In this embodiment, the setting of the filling channel not only facilitates the doctor's operation of the guidewire 18 for positioning, but also protects the opening and closing assembly, avoiding problems such as tearing of the elastic membranes 8 of the opening and closing assembly due to the high blood flow pressure in the covered stent cavity, and displacement of the implant in the aneurysm cavity.

[0075] Figure 3In the stent, the filling tube 2 is also equipped with a filling tube fixation assembly, which includes a fixation ring 9 and a fixation wire 10, serving to further fix the filling tube 2 to the short-leg branch. The fixation ring 9 circumferentially surrounds the outside of the filling tube 2, and there are at least one fixation ring 9. It is then fixed to the covering 13 by the fixation wire 10. The function of the filling tube fixation assembly is to prevent the filling tube 2 from shaking due to the high blood flow velocity within the covered stent lumen, thus providing a fixation effect. Without the filling tube fixation assembly, the filling tube 2 would shake and deflect under the impact of blood flow, making it difficult for the doctor to position the guidewire 18. The fixation ring 9 and the fixation wire 10 can be made of materials such as PET, ePTFE, PTFE, FEP, nickel-titanium alloy, platinum-iridium alloy, cobalt-chromium-nickel alloy, or platinum-dip alloy.

[0076] like Figure 5 As shown, an abdominal aortic aneurysm 21 is formed at the junction of the abdominal aorta 20 with the right iliac artery 22 and the left iliac artery 23. After the covered stent reaches the abdominal aortic aneurysm 21 via the covered stent delivery device, the covered stent is released, allowing the covering 13 of the covered stent to completely cover the entire abdominal aortic aneurysm 21. When it is necessary to fill the abdominal aortic aneurysm 21, the guidewire 18 is guided into the filling channel through the contrast marker 7 until the distal end of the guidewire 18 extends into the aneurysm cavity of the abdominal aortic aneurysm 21; then, the microcatheter 19, guided by the guidewire 18, enters the aneurysm cavity through the filling channel; then the guidewire 18 is withdrawn, and the internal channel of the microcatheter 19 is used to deliver implants such as coils, bio-adhesive, and liquid embolizing agents into the aneurysm cavity. The guidewire 18 and / or the microcatheter 19 can also be pre-assembled within the covered stent, and can be directly used to fill the aneurysm cavity after the covered stent is released into the blood vessel.

[0077] In this embodiment, the covered stent can be implanted into the patient's blood vessel first. After the hemangioma is completely blocked, the filling channel reserved in the covered stent is used to deliver the hemangioma cavity implant for filling the hemangioma, which simplifies the surgical procedure and reduces patient suffering.

[0078] Example 2:

[0079] A covered stent delivery system includes the covered stent as described in Example 1 and a covered stent conveyor for delivering the covered stent.

[0080] Example 3:

[0081] An intravascular implantable component includes the covered stent of Example 1 and an aneurysm cavity implant. The aneurysm cavity implant is adapted to the filling channel and is made of coils, bio-adhesive, or a liquid embolizing agent.

[0082] Example 4:

[0083] An intravascular implantable component delivery system includes the intravascular implantable component as described in Example 3 and an implantable component delivery device for delivering the intravascular implantable component.

[0084] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A covered stent, characterized by, The stent cover includes a stent body (1) and a filling tube (2) arranged in the stent body (1), and the filling tube (2) is provided with a filling channel, and the inner cavity of the stent body (1) is communicated with the outside of the stent body (1) through the filling channel.

2. The covered stent of claim 1, wherein, The stent body (1) is provided with one or more than two filling tubes (2); The inner diameter of the filling tube (2) is 0.1-50mm, and the length is 1-300mm; The filling tube (2) includes an inner layer and an outer layer fixedly connected with the inner layer.

3. The covered stent of claim 1, wherein, One end of the filling tube (2) is provided with a filling channel inlet end (3), and the other end is provided with a filling channel outlet end (4), and the side wall of the stent body (1) is provided with a side wall opening matched with the filling channel outlet end (4), and the filling channel outlet end (4) is fixedly connected with the side wall of the stent body (1).

4. The covered stent of claim 3, wherein, One end of the stent body (1) is provided with a blood flow inlet end (5), and the filling channel inlet end (3) faces away from the blood flow inlet end (5).

5. The covered stent of claim 4, wherein, The blood flow inlet end (5) is provided with a stent fixing part (6).

6. The covered stent of claim 3, wherein, The filling channel inlet end (3) is provided with a filling channel development mark (7).

7. The covered stent of claim 3, wherein, The filling channel outlet end (4) is provided with an opening and closing assembly matched with the filling channel outlet end (4), and the opening and closing assembly includes two or more elastic membranes (8).

8. The covered stent of claim 3, wherein, The filling channel outlet end (4) and the side wall of the stent body (1) are fixedly connected through a suture line; The filling tube (2) is further provided with at least one filling tube fixing assembly, the filling tube fixing assembly includes a fixing ring (9) arranged on the outside and / or inside of the filling tube (2) and fixedly connected with the filling tube (2), and a fixing line (10), and the fixing ring (9) is fixedly connected with the side wall of the stent body (1) through the fixing line (10).

9. The stent of claim 1 or 8, wherein The stent body (1) includes a stent main body segment (11) and zero or more stent branch segments (12); The stent main body segment (11) and / or the stent branch segment (12) includes a cover film (13) and a plurality of support skeletons (14) fixedly connected with the cover film (13), and the support skeletons (14) are located on the inside and / or outside of the cover film (13); The support skeleton (14) includes a metal wire (15) arranged in a wave-shaped ring and a butt joint pipe (16) matched with the metal wire (15), and the leading end and the tail end of the metal wire (15) are fixedly connected through the butt joint pipe (16); The stent main body segment (11) and / or the stent branch segment (12) is provided with a stent development mark (17); The filling tube (2) is arranged in the stent main body segment (11) and / or the stent branch segment (12); The stent main body segment (11) and the stent branch segment (12) are fixedly connected through a suture line.

10. The covered stent of claim 1, wherein, The filling tube (2) is provided with a detachable guide wire (18) and / or microcatheter (19) matched with the filling channel.

11. A film-coated stent delivery system, characterized in that, The covered stent delivery system comprises the covered stent according to any one of claims 1 to 10 and a covered stent delivery device for delivering the covered stent.

12. An intravascular implant assembly comprising: The endovascular implant assembly comprises the covered stent according to any one of claims 1 to 10 and an aneurysm cavity implant.

13. An endovascular implant assembly according to claim 12, wherein, The aneurysm cavity implant is adapted to the filling channel, the aneurysm cavity implant comprising one or more of a coil, a bio glue, a liquid embolic agent.

14. An intravascular implant assembly delivery system characterized by, The endovascular implant assembly delivery system comprises the endovascular implant assembly according to claim 12 or 13 and an implant assembly delivery device for delivering the endovascular implant assembly.

Images