WO2013044823A1 - 一种覆膜支架 - Google Patents

一种覆膜支架 Download PDF

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Publication number
WO2013044823A1
WO2013044823A1 PCT/CN2012/082157 CN2012082157W WO2013044823A1 WO 2013044823 A1 WO2013044823 A1 WO 2013044823A1 CN 2012082157 W CN2012082157 W CN 2012082157W WO 2013044823 A1 WO2013044823 A1 WO 2013044823A1
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WO
WIPO (PCT)
Prior art keywords
stent
bare
stent graft
graft according
graft
Prior art date
Application number
PCT/CN2012/082157
Other languages
English (en)
French (fr)
Inventor
朱清
罗建方
彭大冬
罗七一
Original Assignee
上海微创医疗器械（集团）有限公司
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Publication date
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Publication of WO2013044823A1 publication Critical patent/WO2013044823A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06—Blood vessels
    • A61F2/07—Stent-grafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/89—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06—Blood vessels
    • A61F2002/065—Y-shaped blood vessels
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06—Blood vessels
    • A61F2/07—Stent-grafts
    • A61F2002/075—Stent-grafts the stent being loosely attached to the graft material, e.g. by stitching
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2002/828—Means for connecting a plurality of stents allowing flexibility of the whole structure

Definitions

  • the present application relates to the field of medical device technology, and in particular to a stent graft. Background technique
  • the stent grafts are often designed according to the physiological shape of the human blood vessels.
  • the stents are usually equal-diameter stents or variable-diameter stent grafts that can be bent to one side.
  • Ordinary stent grafts tend to have distal tilting or long-term tilting in the curved vessel segment, so that vascular beats can easily cause damage to the distal vessel of the stent, resulting in secondary dissection.
  • at least 20% of the thoracic aorta Tumor patients have the above lesions in the long-term after interventional surgery.
  • two corresponding treatments are usually used in clinical practice: 1. Select a longer stent and extend the distal end of the stent graft to the descending aorta. To avoid distal tilting or opening the occluded descending main blood vessels, which may require multiple stent grafts and systems during surgery; 2. First, implant a stent graft to block the proximal rupture of the thoracic aortic aneurysm, then Place one or more bare metal stents at the distal end to extend the distal rivet region to the descending aorta.
  • the two existing solutions that is, occlusion of the blood vessel or increase of the length of the rivet, can solve the secondary interlayer problem caused by the distal lifting of the stent graft, but
  • the two programs are implemented, not only the problem of blocking part of the branch blood vessels, but also the bad sequelae, and the blood vessels of the patient may be wound many times.
  • multiple surgical procedures are cumbersome, resulting in prolonged surgery. Summary of the invention
  • the embodiment of the present application provides a stent graft, which does not have a tilt at the distal end, and can not only solve the secondary interlayer problem caused by the distal tilt of the stent graft, but also does not have a branching portion. Blood vessels and problems with blood vessels in multiple trauma patients.
  • the technical solution provided by the embodiment of the present application is as follows: A stent graft, wherein: at least one end of the stent graft is connected with a bare stent.
  • the bare stent is fixed on the film of the stent graft and connected to the membrane through a plurality of points.
  • the plurality of points are evenly distributed over the circumference of the end of the stent graft.
  • the bare bracket comprises a metal bracket of at least two bands.
  • the bare bracket is directly connected between the metal brackets adjacent to the two bands.
  • the bare brackets are connected between the metal brackets adjacent to the two bands by a connecting rod.
  • the bare bracket connecting rod is a straight rod type or an S type.
  • the structure of the bare bracket is a cylindrical structure.
  • the structure of the bare bracket is a truncated cone structure.
  • the structure of the bare bracket is a step-reducing structure composed of a truncated cone structure and two cylindrical structures respectively connected at two ends of the truncated cone structure, and the diameters of the two sections of the cylindrical structure are respectively and The ends of the connected truncated cone structures have the same diameter.
  • the stent graft comprises: a coronary artery stent, an intracranial vascular stent, a peripheral vascular stent, an intraoperative stent, a heart valve stent, a biliary stent, an esophageal stent, an intestinal stent, a pancreatic duct stent, a urethral stent or a trachea support.
  • the occluded blood vessel can be opened, the rivet area of the stent can be increased, and the rivet area of the stent can be reduced. Or eliminate the stress on the distal end of the stent.
  • the bare bracket is composed of a plurality of band metal brackets, and the plurality of bands are connected by a connecting rod, so that the bare bracket has a certain bending property, so when the stent graft is used for bending the blood vessel segment, the end portion is not The lifting will occur, so that the secondary interlayer problem caused by the distal lifting of the stent graft can be solved.
  • the stent graft only has a bare stent fixed at the end, and the stent graft does not extend to the straight section of the descending aorta, so there is no problem of blocking part of the branch vessel.
  • the bare stent is fixed together with the stent graft, and can be implanted once, the operation is simple, and the operation is not repeated Trauma patient blood vessels.
  • the stent graft provided by the invention has a simple structure and is easy to process.
  • FIG. 1 is a schematic structural view of a specific embodiment of a stent graft provided by the present application
  • FIG. 2 is a schematic structural view of a specific embodiment of a stent graft of the stent graft provided by the present application
  • FIG. 3 is a schematic structural view of another embodiment of a bare stent of a stent graft provided by the present application;
  • FIG. 4 is a partially enlarged schematic structural view showing still another embodiment of the bare stent of the stent graft provided by the present application;
  • Figure 5 is a schematic view showing the structure of a mold for a stent graft in the embodiment provided by the present application;
  • FIG. 6 is a schematic structural view of another manufacturing mold of the stent graft in the embodiment provided by the present application.
  • Figure 7 is a schematic view showing the structure of another mold for the stent graft in the embodiment provided by the present application.
  • Fig. 8 is a schematic view showing the structure of another embodiment of the stent graft provided by the present application. detailed description
  • FIG. 1 is a schematic structural view of a specific embodiment of a stent graft provided by the present application. As shown in Fig. 1, Fig. 1 is a stent graft, and 3 is a membrane on the stent graft, wherein: a bare stent 2 is attached to at least one end of the stent graft 1.
  • the stent graft 1 can be a common common vascular stent, such as: coronary stent, intracranial stent, peripheral vascular stent, intraoperative stent, heart valve stent, biliary stent, esophageal stent, intestinal stent, pancreatic duct stent, Urethral stent or tracheal stent.
  • vascular stent such as: coronary stent, intracranial stent, peripheral vascular stent, intraoperative stent, heart valve stent, biliary stent, esophageal stent, intestinal stent, pancreatic duct stent, Urethral stent or tracheal stent.
  • the number of the bare brackets 2 is at least one, and the bare brackets 2 are disposed at the ends of the stent graft 1.
  • Fig. 3 is a film on the stent graft 1, and the bare stent 2 is fixed on the membrane 3, and the bare stent 2 and the membrane 3 are connected by a plurality of dots.
  • a plurality of points between the bare stent 2 and the film 3 are evenly distributed on the circumference of the end of the stent graft 1, and the bare stent 2 and the film 3 are
  • the fixed position of a plurality of points can also be selected according to the actual situation, for example: the connection point disposed at the opposite position of the bending direction of the bare bracket 2 can be denser than other positions.
  • the bare bracket 2 is composed of a metal bracket of at least two bands, and the metal brackets of the adjacent two bands may be directly fixed to each other or may be fixed by a connecting rod.
  • FIG. 2 is a schematic view showing the structure of a specific embodiment of the bare stent of the stent graft provided by the present application.
  • 31 is a metal bracket of one band
  • 32 is a connecting rod between metal brackets of two bands.
  • the number of connecting rods 32 can be appropriately increased or decreased depending on the bending performance and supporting strength performance required for the stent graft.
  • the connecting rod 32 is connected in an S-shape or a plurality of S-types.
  • the connecting rod 32 is a straight rod.
  • an S-shaped connecting rod can be selected, which is advantageous for enhancing the bending performance of the stent graft; and when a stent graft having a large supporting strength is required, a straight line can be selected.
  • Rod type connecting rod In addition, the two bands of metal brackets 31 can also be directly connected, as shown in Figure 4, two bands The metal brackets are directly connected to each other and the connection point is 33. The stent graft of this type of connection has a greater support strength.
  • the shape of the stent graft provided by the embodiment of the present application can be freely set according to clinical needs.
  • the stent can be shaped into a set shape using different molds and can meet set size and performance requirements.
  • 5 to 7 are schematic structural views of three manufacturing molds of the stent graft provided by the embodiment of the present application, wherein 4 are all introduction sections, 5 are shaping sections, and the shape of the shaping section 5 determines the shape of the stent, as shown in the figure.
  • the shaped section in the figure is cylindrical, so the structure of the fabricated bracket is a cylindrical structure; in Fig.
  • the shaped section 5 is a truncated cone, and the formed bracket is a truncated cone-shaped structure; and the shaped section 5 in Fig. 7 It is a circular table and two cylinders respectively connected at both ends of the circular table, and the diameters of the two cylindrical structures are respectively the same as the diameters of the ends of the circular table-like structure connected thereto, so the structure of the prepared bracket is a step-reducing structure .
  • FIG. 8 a schematic view of the structure of another type of stent graft in the embodiment provided by the present application is shown in Fig. 6 as a stent graft, and in the figure, 7 is a bare stent, and 8 is a film.
  • the bare bracket 7 is attached to the end of the 6-end of the stent graft.
  • the role of the bare stent 7 is to increase the rivet area of the stent in the blood vessel without blocking the branch vessel, and to avoid secondary interlayer. It will be understood by those skilled in the art from the present disclosure that a bare stent can also be attached to the other end of the stent graft 6.
  • the invention folds the outwardly flared end of the stent graft by connecting a section of the bare stent at at least one end of the stent graft, so that the conventional stent in the prior art can be prevented from being tilted at the distal end of the curved vessel segment. problem.
  • the bare bracket is composed of at least two metal brackets of the upper band, and the bending property and flexibility are very good, and the problem that the common bracket end is lifted in the prior art can be avoided.

Abstract

一种覆膜支架（1，6），该覆膜支架（1，6）的至少一个端部连接有裸支架（2，7）。该裸支架（2，7）可以将覆膜支架（1，6）向外张开的端部收拢起来，以避免覆膜支架（1，6）端部翘起。该裸支架（2，7）可以在不封堵胸腔内分支血管的情况下开通闭塞的主动脉降血管，并且可以在不封堵分支血管的情况下增加支架的铆钉区域。

Description

一种覆膜支架 技术领域
本申请涉及医疗器械技术领域， 特别是涉及一种覆膜支架。 背景技术
在采用介入手术治疗胸主动脉瘤时， 使用的覆膜支架常常是根据 人体血管的生理形状设计的， 支架多为可向一侧弯曲的等直径支架或 变直径覆膜支架。 普通覆膜支架在弯曲血管段容易出现远端翘起或长 期存在着翘起的趋势， 这样血管搏动极易引发支架远端血管损伤， 导 致二次夹层， 据统计至少有 20%的胸主动脉瘤患者在介入手术后远期 存在以上病变。
为解决普通覆膜支架端部翘起的问题， 目前在临床上通常采用两 种相对应的处理方式： 一、 选择较长的支架， 将覆膜支架的远端刻意 延长到降主动脉直段， 来避免远端翘起或开通闭塞的降主血管， 这在 手术中可能需要多个覆膜支架和系统； 二、 先植入覆膜支架封堵胸主 动脉瘤的近端破口， 然后在远端放置一个或多个金属裸支架来将远端 铆钉区域延长到降主动脉直段。
通过对现有技术研究， 申请人发现： 现有的这两种方案， 即撑开 闭塞血管或增加铆钉长度， 虽然可以解决由于覆膜支架远端翘起而导 致的二次夹层问题， 但这两种方案在实施时， 不仅存在封堵部分分支 血管的问题， 从而导致不良后遗症， 而且都可能会多次创伤病人的血 管。 另外， 多次手术操作较为繁琐， 使得手术时间延长。 发明内容
有鉴于此， 本申请实施例提供一种覆膜支架， 在远端不存在翘起， 不仅可以解决由于覆膜支架远端翘起而导致的二次夹层问题， 而且不 会存在封堵部分分支血管以及多次创伤病人血管的问题。 为了实现上述目的， 本申请实施例提供的技术方案如下： 一种覆膜支架， 其中： 所述覆膜支架的至少一个端部连接有裸支 架。
优选地， 所述裸支架固定在所述覆膜支架的覆膜上， 并且与覆膜 之间通过多个点相连接。
优选地， 所述多个点均匀分布在所述覆膜支架端部的圆周上。 优选地， 所述裸支架包括至少两个波段的金属支架。
优选地， 所述裸支架相邻两个波段的金属支架之间直接连接。 优选地， 所述裸支架相邻两个波段的金属支架之间通过连接杆连 接。
优选地， 所述裸支架连接杆为直杆型或 S型。
优选地， 所述裸支架的结构为圆柱状结构。
优选地， 所述裸支架的结构为圆台状结构。
优选地， 所述裸支架的结构为由圆台状结构和分别连接在所述圆 台状结构两端的两段圆柱状结构组成的阶梯变径结构， 并且两段所述 圆柱状结构的直径分别与和其相连接的圆台状结构的端部的直径相 同。
优选地， 所述覆膜支架包括： 冠状动脉血管支架、 颅内血管支架、 外周血管支架、 术中支架、 心脏瓣膜支架、 胆道支架、 食道支架、 肠 道支架、 胰管支架、 尿道支架或气管支架。
由以上技术方案可见， 与现有的覆膜支架相比， 通过在本发明覆 膜支架至少一个端部连接一段金属裸支架， 可以撑开闭塞的血管， 增 加支架的铆钉区域， 同时可以减小或消除支架远端翘起的应力。 并且 该裸支架由多个波段的金属支架组成， 多个波段之间通过连接杆相连 接， 使得裸支架具有一定的弯曲性， 这样当使用该覆膜支架用于弯曲 血管段时， 端部不会出现翘起， 从而可以解决由于覆膜支架远端翘起 而导致的二次夹层问题。
另外， 该覆膜支架仅在端部固定有一段裸支架， 覆膜支架不会延 长到降主动脉直段， 所以不存在封堵部分分支血管的问题。 并且裸支 架与覆膜支架固定在一起， 一次植入即可， 手术操作简单， 不会多次 创伤病人血管。
此外， 本发明提供的该覆膜支架的结构简单， 加工容易。 附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案， 下面 将对实施例或现有技术描述中所需要使用的附图作简单地介绍， 显而 易见地， 下面描述中的附图仅仅是本申请中记载的一些实施例， 对于 本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根 据这些附图获得其他的附图。
图 1为本申请提供的覆膜支架的一个具体实施方式的结构示意图； 图 2 为本申请提供的覆膜支架的裸支架的一个具体实施方式的结 构示意图；
图 3 为本申请提供的覆膜支架的裸支架的另一个具体实施方式的 结构示意图；
图 4 为本申请提供的覆膜支架的裸支架的又一个具体实施方式的 局部放大结构示意图；
图 5 为本申请提供的实施例中覆膜支架的一种制作模具的结构示 意图；
图 6 为本申请提供的实施例中覆膜支架的另一种制作模具的结构 示意图；
图 7 为本申请提供的实施例中覆膜支架的又一种制作模具的结构 示意图；
图 8 为本申请提供的覆膜支架的另一个具体体实施方式的结构示 意图。 具体实施方式
为了使本技术领域的人员更好地理解本申请中的技术方案， 下面 将结合本申请实施例中的附图， 对本申请实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本申请一部分实施例， 而不是全部的实施例。 基于本申请中的实施例， 本领域普通技术人员 在没有做出创造性劳动前提下所获得的所有其他实施例， 都应当属于 本申请保护的范围。
图 1为本申请提供的覆膜支架的一个具体实施方式的结构示意图。 如图 1所示， 图中 1为覆膜支架， 3为该覆膜支架上的覆膜，其中： 在覆膜支架 1的至少一个端部连接有裸支架 2。
覆膜支架 1 可以为普通常见的血管支架， 例如： 冠状动脉血管支 架、 颅内血管支架、 外周血管支架、 术中支架、 心脏瓣膜支架、 胆道 支架、 食道支架、 肠道支架、 胰管支架、 尿道支架或气管支架等。
在本申请实施例中， 裸支架 2 的个数为至少一个， 并且裸支架 2 均设置在覆膜支架 1的端部。 另外， 如图 1所示， 图中 3为覆膜支架 1 上的覆膜， 裸支架 2固定在覆膜 3上， 并且裸支架 2与覆膜 3之间通 过多个点相连接。 为了保证裸支架 2与覆膜 3之间固定牢固， 裸支架 2 与覆膜 3之间的多个点均匀分布在覆膜支架 1 端部的圆周上， 此外， 裸支架 2与覆膜 3之间的多个点的固定位置还可以根据实际情况来选 择， 例如： 在裸支架 2 弯曲方向的相反位置处设置的连接点， 相对其 他位置可以较为密集。
在本申请实施例中， 裸支架 2 由至少两个波段的金属支架组成， 并且相邻两个波段的金属支架之间可以直接相固定， 也可以通过连接 杆相固定。
图 2为本申请提供的覆膜支架的裸支架的一个具体实施方式的结构 示意图。 如图 2所示， 图中 31为一个波段的金属支架， 32为两个波段 的金属支架之间的连接杆。 在实际使用时， 根据覆膜支架所需要的弯曲 性能和支撑强度性能要求， 可以适当地增加或减少连接杆 32的数量。
另外， 通过改变裸支架 2上相邻两个波段的金属支架 31之间的连 接杆 32的形状， 还可以实现改变本发明覆膜支架所需要的弯曲性能和 支撑强度性能。 在图 2中连接杆 32为 S型或多个 S型相连接。 如图 3 所示， 连接杆 32为直杆。 当需要弯曲强度较大的覆膜支架时， 可以选 择 S 型连接杆， 这种连接杆有利于增强覆膜支架的弯曲性能； 而当需 要支撑强度较大的覆膜支架时， 则可以选择直杆型的连接杆。 此外， 两个波段的金属支架 31之间还可以直接相连， 如图 4所示， 两个波段 的金属支架之间直接相连， 连接部位为 33。 这种连接方式的覆膜支架 的支撑强度更大。
在实际应用中， 根据临床需要， 本申请实施例提供的覆膜支架的 形状可以自由设定。 实际操作时， 利用不同的模具可以将覆膜支架定 型为设定好的形状， 并且可以达到设定的尺寸和性能要求。 如图 5~7 为本申请实施例提供的覆膜支架的三种制作模具的结构示意图， 图中 4 均为导入段， 5均为定型段， 定型段 5的形状决定支架的形状， 如图 5 所示， 图中定型段为圆柱状， 所以制成的支架的结构为圆柱状结构； 图 6中定型段 5为圆台状， 制成的支架为圆台状结构； 而图 7中定型 段 5 为圆台和分别连接在圆台两端的两段圆柱， 并且两段圆柱状结构 的直径分别与和其相连接的圆台状结构的端部的直径相同， 所以制成 的支架的结构为阶梯变径结构。
此外， 本申请其他实施例还提供另外一类端部连接有裸支架的覆 膜支架。 如图 8 所示， 为本申请提供的实施例中另一类覆膜支架的结 构示意图， 图中 6为覆膜支架， 图中 7为裸支架， 图中 8为覆膜。 裸 支架 7连接在覆膜支架 6—端的端部。 裸支架 7的作用是可以实现在 不封堵分支血管的前提下增加支架在血管中的铆钉区域， 避免二次夹 层。 本领域技术人员根据本发明内容可以理解， 还可以在覆膜支架 6 的其他端部连接有裸支架。
本发明通过在覆膜支架的至少一个端部连接一段裸支架， 将覆膜 支架向外张开的端部收拢起来， 从而可以避免现有技术中的普通支架 在弯曲血管段远端翘起的问题。 同时， 本发明中裸支架至少由两个以 上波段的金属支架组成， 其弯曲性和柔韧性非常好， 更加可以避免现 有技术中普通支架端部翘起的问题。
以上所述仅是本申请的优选实施方式， 使本领域技术人员能够理 解或实现本申请。 对这些实施例的多种修改对本领域的技术人员来说 将是显而易见的， 本文中所定义的一般原理可以在不脱离本申请的精 神或范围的情况下， 在其它实施例中实现。 因此， 本申请将不会被限 制于本文所示的这些实施例， 而是要符合与本文所公开的原理和新颖 特点相一致的最宽的范围。

Claims

1、 一种覆膜支架， 其特征在于， 所述覆膜支架的至少一个端部连 接有裸支架。
2、 根据权利要求 1所述的覆膜支架， 其特征在于， 所述裸支架固 定在所述覆膜支架的覆膜上， 并且与覆膜之间通过多个点相连接。
3、 根据权利要求 2所述的覆膜支架， 其特征在于， 所述多个点均 匀分布在所述覆膜支架端部的圆周上。
4、 根据权利要求 1或 2所述的覆膜支架， 其特征在于， 所述裸支 架包括至少两个波段的金属支架。
5、 根据权利要求 4所述的覆膜支架， 其特征在于， 所述裸支架相 邻两个波段的金属支架之间直接连接。
6、 根据权利要求 4所述的覆膜支架， 其特征在于， 所述裸支架相 邻两个波段的金属支架之间通过连接杆连接。
7、 根据权利要求 6所述的覆膜支架， 其特征在于， 所述裸支架连 接杆为直杆型或 S型。
8、 根据权利要求 1所述的覆膜支架， 其特征在于， 所述裸支架的 结构为圆柱状结构。
9、 根据权利要求 1所述的覆膜支架， 其特征在于， 所述裸支架的 结构为圆台状结构。
10、 根据权利要求 1所述的覆膜支架， 其特征在于， 所述裸支架 的结构为由圆台状结构和分别连接在所述圆台状结构两端的两段圆柱 状结构组成的阶梯变径结构， 并且两段所述圆柱状结构的直径分别与 和其相连接的圆台状结构的端部的直径相同。
1 1、 根据权利要求 1所述的覆膜支架， 其特征在于， 所述覆膜支 架包括： 冠状动脉血管支架、 颅内血管支架、 外周血管支架、 术中支 架、 心脏瓣膜支架、 胆道支架、 食道支架、 肠道支架、 胰管支架、 尿 道支架或气管支架。
PCT/CN2012/082157 2011-09-29 2012-09-27 一种覆膜支架 WO2013044823A1 (zh)

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