CN112891033B - 管腔支架 - Google Patents
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- CN112891033B CN112891033B CN201911222563.4A CN201911222563A CN112891033B CN 112891033 B CN112891033 B CN 112891033B CN 201911222563 A CN201911222563 A CN 201911222563A CN 112891033 B CN112891033 B CN 112891033B
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- 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
- A61F2/91—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
- A61F2/915—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
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- A—HUMAN NECESSITIES
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- 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
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- A—HUMAN NECESSITIES
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- 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
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- A—HUMAN NECESSITIES
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- 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
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
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- 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
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- 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
- A61F2/91—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
- A61F2/915—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
- A61F2002/9155—Adjacent bands being connected to each other
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- 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
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- A61F2/915—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
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- A—HUMAN NECESSITIES
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- 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
- A61F2/91—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
- A61F2/915—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
- A61F2002/9155—Adjacent bands being connected to each other
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2002/9505—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
- A61F2002/9511—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument the retaining means being filaments or wires
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- 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
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
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Abstract
本发明公开了管腔支架,包括管状主体与半释放装置,所述半释放装置包括限位杆,以及缠绕在所述管状主体上的束缚线,所述管状主体上设置有多个线孔,所述束缚线通过其中一个所述线孔进入所述管状主体内、并通过另一个所述线孔穿至所述管状主体外,所述束缚线上设置有至少两个锁定部,所述至少两个锁定部以可分离的方式与所述限位杆连接,当所述至少两个锁定部与所述限位杆连接时,所述束缚线对所述管状主体进行周向约束。本发明的有益效果:由于束缚线穿设于管状主体的内、外表面,线孔可对束缚线起轴向限位作用,使束缚线更容易实现对管状主体的均匀压缩。
Description
技术领域
本发明涉及介入医疗器械技术领域,尤其涉及一种管腔支架。
背景技术
近十余年来,主动脉覆膜支架腔内隔绝术已广泛应用于胸、腹主动脉的动脉瘤和动脉夹层等病变,其疗效确切、创伤小、恢复快、并发症少,已成为一线的治疗方法。手术时,在X线透视监视下,通过相应的输送系统将覆膜支架送到病变位置,覆膜支架将血流与病变位置隔绝,消除血压对病变位置的影响,以达到治愈的目的。
为了解决覆膜支架在体内的定位问题,通常会在支架的关键位置做显影标记,利用显影标记对覆膜支架的轴向和周向进行定位。但是,当覆膜支架压缩在输送鞘管内时,其周向具有压缩褶皱,且轴向处于伸长状态,若此时通过显影标记定位,会存在较大的周向和轴向偏差。
发明内容
本发明要解决的技术问题在于,针对现有技术的上述缺陷,提供一种管腔支架。
本发明解决其技术问题所采用的技术方案是:
提供一种管腔支架,包括管状主体与半释放装置,所述半释放装置包括限位杆,以及缠绕在所述管状主体上的束缚线,所述管状主体上设置有多个线孔,所述束缚线通过其中一个所述线孔进入所述管状主体内、并通过另一个所述线孔穿至所述管状主体外,所述束缚线上设置有至少两个锁定部,所述至少两个锁定部以可分离的方式与所述限位杆连接,当所述至少两个锁定部与所述限位杆连接时,所述束缚线对所述管状主体进行周向约束。
在本发明所述的管腔支架中,所述束缚线包括位于所述管状主体内的内部连接段,所述锁定部设置在所述内部连接段上,所述限位杆位于所述管状主体内。
在本发明所述的管腔支架中,所述束缚线包括位于所述管状主体内的外部连接段,所述锁定部设置在所述外部连接段上,所述限位杆位于所述管状主体外。
在本发明所述的管腔支架中,所述束缚线为线段结构,两个所述锁定部分别设置在所述束缚线的两端。
在本发明所述的管腔支架中,所述管状主体包括沿圆周方向分布的第一区和第二区,所述束缚线设置在所述第二区上。
在本发明所述的管腔支架中,所述第二区所覆盖的圆周角度为180°~340°。
在本发明所述的管腔支架中,所述束缚线为两端封闭的环状结构。
在本发明所述的管腔支架中,所述限位杆的数量为至少两个。
在本发明所述的管腔支架中,所述管状主体包括多圈波形环状物,所述波形环状物包括多个波峰、多个波谷及多个分别连接相邻的所述波峰与所述波谷的连接杆;
所述束缚线包括位于所述管状主体内的内部连接段,以及位于所述管状主体外的外部连接段,所述内部连接段或所述外部连接段的长度为e,所述线孔与位于所述线孔下方、且距所述线孔最近的波谷之间的垂直距离为f,e与f满足e≤2f。
在本发明所述的管腔支架中,所述管腔支架处于半释放状态时的横截面的外接圆直径与所述管腔支架完全展开时的横截面的外接圆直径的比值为0.6~0.8。
综上所述,实施本发明的一种管腔支架,具有以下有益效果:本申请通过在管腔支架上设置半释放装置,该半释放装置可以提高管腔支架的轴向和周向定位的准确性,并且由于本申请半释放装置的束缚线穿设于管状主体的内、外表面,线孔可对束缚线起轴向限位作用,使束缚线更容易实现对管状主体的均匀压缩。
附图说明
下面将结合附图及实施例对本发明作进一步说明,附图中:
图1是本发明实施例之一提供的管腔支架处于半释放状态时的示意图;
图2是图1所示管腔支架的俯视图;
图3是图1所示管腔支架的A部放大图;
图4是图1所示管腔支架完全展开时的示意图;
图5是图4所示管腔支架的俯视图;
图6是图1所示管腔支架的束缚线包括多个内部连接段与多个外部连接段的示意图;
图7是图6所示管腔支架处于半释放状态时的示意图;
图8是图1所示管腔支架的束缚线越过波谷时的示意图;
图9是图1所示管腔支架的线孔的示意图;
图10是图1所示管腔支架的束缚线未越过波谷时的示意图;
图11是本发明实施例之二提供的管腔支架完全展开时的示意图;
图12是图11所示管腔支架处于半释放状态时的示意图;
图13是本发明实施例之三提供的管腔支架完全展开时的示意图;
图14是图13所示管腔支架处于半释放状态时的示意图;
图15是图13所示管腔支架的用于与两个限位杆连接的管状主体完全展开时的示意图;
图16是图15所示管腔支架处于半释放状态时的示意图;
图17是本发明实施例之四提供的管腔支架完全展开时的示意图;
图18是图17所示管腔支架处于半释放状态时的示意图;
图19是图17所示管腔支架的束缚线对管状主体进行局部束缚的示意图;
图20是图19所示管腔支架处于半释放状态时的示意图。
具体实施方式
为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图对本发明的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本发明。但是本发明能够以很多不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本发明内涵的情况下做类似改进,因此本发明不受下面公开的具体实施的限制。
需要说明的是,当元件被称为“固定于”或“设置于”另一个元件,它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件,它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明目的,并不表示是唯一的实施方式。
除非另有定义,本文所使用的所有技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的,不是旨在于限制本发明。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
在介入医疗领域,通常定义管腔支架在释放后距心脏近的一端为近端,距心脏远的一端为远端。
请参阅图1,本申请实施例之一提供了一种管腔支架100,其包括裸支架,以及连接在裸支架上的覆膜102。管腔支架100为中空的管腔结构,管腔支架100的管腔构成血流流通的通道。
其中,裸支架采用具有良好生物相容性的材料制成,如镍钛、不锈钢等材料。覆膜102采用具有良好生物相容性的高分子材料制成,如PTFE、FEP、PET等。裸支架包括多圈波形环状物101(如图9所示),每圈波形环状物101包括多个波峰、多个波谷及多个分别连接相邻波峰与波谷的连接杆,多圈波形环状物101从近端到远端依次排布,优选为平行间隔排布。波形环状物101为闭合圆柱状结构,多圈波形环状物101间可以具有相同或相似的波形形状,可以理解的是,本实施例并不限定波形环状物101的具体结构,波形环状物101的波形可以根据需要设置,同时每圈波形环状物101中的波形个数以及波形高度均可根据需要设置。
请参阅图1和图2,管腔支架100包括管状主体11,以及连接在管状主体11上、对管状主体11进行周向约束的半释放装置20。半释放装置20包括限位杆21,以及缠绕在管状主体11上的束缚线22。
管状主体11上设置有多个线孔111,束缚线22通过其中一个线孔111进入管状主体11内、并通过另一个线孔穿至管状主体11外,即束缚线22穿设于管状主体11的内、外表面。
请参阅图3,束缚线22上设置有至少两个锁定部221,所述至少两个锁定部221以可分离的方式与限位杆21连接。当锁定部221与限位杆21连接时,束缚线22对管状主体11进行周向约束。请参阅图4和图5,当限位杆21与两个锁定部221分离时,束缚线22从线孔111处向管状主体11的外表面运动,直至管状主体11完全展开。
由于束缚线22穿设于管状主体11的内、外表面,线孔111可对束缚线22起轴向限位作用,使束缚线22更容易实现对管状主体11的均匀压缩。并且,本申请不需要额外在管状主体11上设置对束缚线22进行轴向限位的限位装置,简化了支架的制作工艺。
在图1~图5所示的实施例中,管状主体11上设置有四个与其内腔相连通的线孔111,束缚线22可在线孔111中自由穿设,四个线孔111分别为第一线孔111a、第二线孔111b、第三线孔111c和第四线孔111d。其中,束缚线22通过第一线孔111a进入管状主体11内,再通过第二线孔111b穿至管状主体11外。随后,束缚线22通过第三线孔111c进入管状主体11内,再通过第四线孔111d穿至管状主体11外。即,束缚线22通过两处分别从管状主体11的内、外表面穿设。
束缚线22包括两个位于管状主体11内的内部连接段22a,以及两个位于管状主体11外的外部连接段22b。两个内部连接段22a上各设置有一个锁定部221,即锁定部221的数量为两个,锁定部221优选为环扣结构或一根束缚线22对折形成的半圆环结构,限位杆21可从该环扣结构或半圆环结构中穿设。
限位杆21位于管状主体11内,当限位杆21与两个锁定部221连接时,束缚线22对管状主体11进行周向约束。当限位杆21与两个锁定部221分离时,限位杆21对锁定部221的束缚解除,束缚线22在管状主体11的径向支撑力的作用下从线孔111处向管状主体11的外表面运动,直至管状主体11完全展开。由于束缚线22从管状主体11的内、外表面穿设,管状主体11在展开的过程中,束缚线22可一直堵在线孔111处,避免管腔支架100在线孔111处出现渗漏。优选的,束缚线22的丝径略小于或等于线孔111的孔径,使束缚线22更好的实现对线孔111的密封。
由于限位杆21位于管腔支架100内,可避免限位杆21在管腔支架100定位调整的过程中损伤血管,降低限位杆21的端部触碰血管发生折弯的风险,且不占用管腔支架100与血管壁之间的调整空间,特别是对于腔内结构复杂的情况,利于管腔支架100的调整定位。
虽然在图1~图5所示的实施例中,束缚线22包括两个内部连接段22a与两个外部连接段22b。但是,本实施例并不限制内部连接段22a与外部连接段22b的具体数量,例如,在图6和图7所示的实施例中,束缚线22包括多个内部连接段22a与多个外部连接段22b。
当管腔支架100在输送鞘管内处于完全径向压缩状态时,束缚线22会处于松散状态,出现轴向移位。请参阅图8,若束缚线22的外部连接段22b(或内部连接段22a)的长度过长,外部连接段22b(或内部连接段22a)容易越过波形环状物101的波谷并勾挂在该波谷上。当管腔支架100从输送鞘管中完全释放后,外部连接段22b(或内部连接段22a)钩挂在波形环状物101上,会导致管腔支架100无法正常展开。
请参阅图9和图10,外部连接段22b(或内部连接段22a)的长度为e,线孔111与位于该线孔111下方、且距该线孔111最近的波谷之间的垂直距离为f,其中e与f满足e≤2f,以避免管腔支架100处于径向压缩状态时束缚线22越过波形环状物101的波谷。
在本实施例中,束缚线22的数量为多条,每条束缚线22为两端封闭的环状结构,多条束缚线22沿轴向间隔分布。其中,束缚线22可以为抗拉伸性能强的柔性线,如聚酯缝合线等。束缚线22可以由单根柔性线组成,也可以由多根柔性线组成。
本申请通过在管腔支架100上设置半释放装置20,当管腔支架100从输送鞘管中完全释放后,在该半释放装置20的约束下,管腔支架100处于半释放状态,此时管腔支架100与血管壁不贴合,操作者仍可对管腔支架100的轴向和周向位置进行调整,待定位准确后,再将半释放装置20的约束解除,使管腔支架100展开贴壁。
可以理解的是,若管腔支架100处于半释放状态时,其横截面的外接圆直径过大,则支架容易贴壁,不利于对其进行轴向和周向的调整;若管腔支架100处于半释放状态时,其横截面的外接圆直径过小,则半释放的作用不大,仍存在较大的周向和轴向的定位偏差。故,在本实施例中,管腔支架100处于半释放状态时的横截面的外接圆直径与管腔支架100展开时的横截面的外接圆直径的比值为0.6~0.8。
本领域的普通技术人员应当知晓,本实施例的管腔支架仅用作举例,并不对本申请进行限制,本申请的管腔支架可以为任意的带裸支架的覆膜管腔支架,包括但不限于胸主动脉支架、腹主动脉支架、胸腹主动脉支架等。
请参阅图11和图12,本申请实施例之二提供了一种管腔支架100,其与实施例之一的管腔支架大体上相同,管腔支架100包括管状主体11与半释放装置20,半释放装置20包括限位杆21与束缚线22,限位杆21位于管状主体11内,束缚线22穿设于管状主体11的内、外表面。
实施例之二与实施例之一的不同之处在于,限位杆21包括至少两个,通过设置至少两个限位杆21,可以对管腔支架100的半释放功能进行分级调节。
具体的,束缚线22包括四个内部连接段22a与四个外部连接段22b,四个内部连接段22a上各设置有一个锁定部221,即锁定部221的数量为四个。两个限位杆21分别为第一限位杆和第二限位杆,第一限位杆与四个锁定部221中的两个锁定部221以可分离的方式连接,第二限位杆与四个锁定部221中的另外两个锁定部221以可分离的方式连接。
本实施例通过设置至少两个限位杆21,可以对管腔支架100的半释放功能进行分级调节。具体的,一次定位准确后,解除一级约束,使第一限位杆与其上的两个锁定部221分离。随后,进行二次定位,解除二级约束,使第二限位杆与其上的两个锁定部221分离。
请参阅图13和图14,本申请实施例之三提供了一种管腔支架100,其与实施例之一的管腔支架大体上相同,管腔支架100包括管状主体11与半释放装置20,半释放装置20包括限位杆21与束缚线22,束缚线22穿设于管状主体11的内、外表面。
实施例之三与实施例之一的不同之处在于,锁定部221设置在外部连接段22b上,限位杆21位于管状主体11外、并与锁定部221以可分离的方式连接。
在图13和图14所示的实施例中,束缚线22包括多个内部连接段22a与多个外部连接段22b。限位杆21位于管状主体11外,锁定部221包括两个,两个锁定部221分别设置在两个外部连接段22b上。装配时,可使两个锁定部221分别沿图示箭头方向移动,然后使限位杆21分别与两个锁定部221连接。当限位杆21与两个锁定部221连接时,束缚线22对管状主体11进行周向约束。
可以理解的是,本实施例并不限定限位杆21的数量,例如,在图15和图16所示的实施例中,限位杆21包括两个,分别为第一限位杆和第二限位杆,锁定部221包括四个。装配时,可使四个锁定部221分别沿图示箭头方向移动,然后使第一限位杆与四个锁定部221中的两个锁定部221连接,并使第二限位杆与四个锁定部221中的另外两个锁定部221连接。通过设置至少两个限位杆21,可以对管腔支架100的半释放功能进行分级调节。
请参阅图17和图18,本申请实施例之四提供了一种管腔支架100,其与实施例之三的管腔支架大体上相同,管腔支架100包括管状主体11与半释放装置20,半释放装置20包括限位杆21与束缚线22,束缚线22穿设于管状主体11的内、外表面。锁定部221设置在外部连接段22b上,限位杆21位于管状主体11外、并与锁定部221以可分离的方式连接。
实施例之四与实施例之三的不同之处在于,束缚线22为线段结构,两个锁定部221分别设置在束缚线22的两端。
装配时,使两个锁定部221分别沿图示箭头方向移动,然后使限位杆21分别与两个锁定部221连接。
在图17和图18所示的实施例中,束缚线22沿圆周方向对管状主体11整体进行周向约束。但是,在其它实施例中,束缚线22还可对管状主体11进行局部束缚。例如,在图19和图20所示的实施例中,管状主体11包括沿圆周方向分布的第一区11a和第二区11b,束缚线22设置在第二区11b上。
当管腔支架100从输送鞘管中释放后、且处于半释放状态时,管腔支架100的第一区11a已充分展开,此时操作人员能准确的对第一区11a进行定位。并且,束缚线22的约束解除后,在管腔支架100的约束部位(第二区11b)逐渐展开的过程中,第一区11a不存在展开运动,大大降低第一区11a的周向对位误差。故,当管状主体11上设置有对定位要求高的部件时,如分支、分支窗口、龙骨等,可以将这些对定位要求高的部件设置在第一区11a,仅对管腔支架100的第二区11b进行周向约束,从而提高定位精度。
可以理解的是,若第二区11b沿周向的约束区域范围太小,会使约束区域的支架沿径向的压缩程度较大,支架在展开过程中,会出现约束区域的支架尚未充分展开,其他区域的支架就已贴壁的缺陷,导致约束区域存在较大的凹槽,造成支架整体贴壁不良,增大了内漏风险。但是若第二区11b沿轴向的约束区域范围太大,则对管腔支架100进行局部约束的意义不大。故,在本实施例中,当管腔支架100完全展开后,第二区11b所覆盖的圆周角度为180°~340°。
以上所述实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (5)
1.一种管腔支架,包括管状主体与半释放装置,所述半释放装置包括位于所述管状主体内的限位杆,以及缠绕在所述管状主体上的束缚线,其特征在于,所述管状主体上设置有至少两个线孔,所述束缚线通过一个所述线孔进入所述管状主体内、并通过另一个所述线孔穿至所述管状主体外,所述束缚线包括位于所述管状主体内的内部连接段;所述束缚线上设置有至少两个锁定部,所述锁定部设置在所述内部连接段上,所述至少两个锁定部以可分离的方式与所述限位杆连接,当所述至少两个锁定部与所述限位杆连接时,与所述限位杆连接的锁定部的数量小于所述内部连接段的数量,所述限位杆与所述管状主体之间存在间隙,所述束缚线对所述管状主体进行周向约束。
2.根据权利要求1所述的管腔支架,其特征在于,所述束缚线为两端封闭的环状结构。
3.根据权利要求1所述的管腔支架,其特征在于,所述限位杆的数量为至少两个。
4.根据权利要求1所述的管腔支架,其特征在于,所述管状主体包括多圈波形环状物,所述波形环状物包括多个波峰、多个波谷及多个分别连接相邻的所述波峰与所述波谷的连接杆;
所述束缚线包括位于所述管状主体内的内部连接段,以及位于所述管状主体外的外部连接段,所述内部连接段或所述外部连接段的长度为e,所述线孔与位于所述线孔下方、且距所述线孔最近的波谷之间的垂直距离为f,e与f满足e≤2f。
5.根据权利要求1所述的管腔支架,其特征在于,所述管腔支架处于半释放状态时的横截面的外接圆直径与所述管腔支架完全展开时的横截面的外接圆直径的比值为0.6~0.8。
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