CN114681119A - 管腔支架 - Google Patents
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Abstract
本发明公开了一种管腔支架,包括管状主体,以及连接在管状主体上的半释放装置,半释放装置包括位于管状主体外的限位杆以及设于管状主体上的束缚线和限位扣,管状主体包括沿圆周方向分布的束缚区和非束缚区,束缚线设置在束缚区,束缚线包括相连接的固定端、束缚部和锁定部,固定端与管状主体固定连接,锁定部和限位扣均以可分离的方式与限位杆连接,当锁定部和限位扣均与限位杆连接时,束缚线对束缚区进行周向约束。本发明的有益效果:通过对管腔支架的周向的局部区域进行均匀压缩,使得管腔支架能够处于半释放状态,以便对管腔支架进行调整定位,提高管腔支架的轴向和周向定位的准确性。
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,以及连接在所述管状主体上的半释放装置,所述半释放装置包括位于所述管状主体外的限位杆以及设于所述管状主体上的束缚线和限位扣,所述管状主体包括沿圆周方向分布的束缚区和非束缚区,所述束缚线设置在所述束缚区,所述束缚线包括相连接的固定端、束缚部和锁定部,所述固定端与所述管状主体固定连接,所述锁定部和所述限位扣均以可分离的方式与所述限位杆连接,当所述锁定部和所述限位扣均与所述限位杆连接时,所述束缚线对所述束缚区进行周向约束。
在本发明所述的管腔支架中,所述半释放装置还包括限位环扣,所述限位环扣设置在所述管状主体的外表面,所述束缚线从所述限位环扣中穿设。
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;
所述限位环扣的数量为多个,在自然状态下,相邻的两个所述限位环扣在沿所述管状主体周向上的距离为m,所述限位环扣的固定点与位于所述限位环扣下方、且距所述限位环扣最近的波谷之间的垂直距离为n,m与n满足m≤2n。
在本发明所述的管腔支架中,所述半释放装置包括至少一组成对设置的所述束缚线,且沿所述管状主体的周向上,成对设置的所述束缚线的固定端分别位于所述限位扣的两侧。
在本发明所述的管腔支架中,成对设置的所述束缚线的长度之比为T1,成对设置的所述束缚线的固定端至所述限位扣的中心轴线的距离之比为T2,T1=T2。
在本发明所述的管腔支架中,成对设置的所述束缚线的长度相等,且沿所述管状主体的周向上,成对设置的所述束缚线的固定端到所述限位扣的距离相等。
在本发明所述的管腔支架中,当成对设置的所述束缚线在所述限位杆的周向限位下对所述束缚区周向约束时,成对设置的所述束缚线的锁定部彼此轴向限位。
在本发明所述的管腔支架中,所述锁定部为所述束缚线卷绕形成的圆环或半圆环结构,当成对设置的所述束缚线在所述限位杆的周向限位下对所述束缚区周向约束时,成对设置的所述束缚线的锁定部互不钩挂,以在所述限位杆与所述限位扣分离时,成对设置的所述束缚线彼此分离。
在本发明所述的管腔支架中,成对设置的所述束缚线中,套设于所述限位杆的所述束缚线具有2个牵引段,2个所述牵引段中的至少一个从另一个所述束缚线的锁定部穿设。
在本发明所述的管腔支架中,所述限位杆的近端设有导向头,且所述导向头的在限位杆的径向上的尺寸与所述限位杆的直径的比值为1~1.5。
综上,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,该半释放装置包括位于管状主体外的限位杆以及设于管状主体上的束缚线和限位扣,管状主体包括沿圆周方向分布的束缚区和非束缚区,束缚线设置在束缚区,束缚线包括相连接的固定端、束缚部和锁定部,固定端与管状主体固定连接,锁定部和限位扣均以可分离的方式与限位杆连接,当锁定部和限位扣均与限位杆连接时,束缚线对束缚区进行周向约束,通过对管腔支架的周向的局部区域进行均匀压缩,使得管腔支架能够处于半释放状态,以便对管腔支架进行调整定位,提高管腔支架的轴向和周向定位的准确性。
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A部放大图;
图3是图1所示管腔支架完全展开时的示意图;
图4是图1所示管腔支架完全展开时的示意图;
图5是一实施例的管腔支架的束缚线越过波谷时的示意图;
图6是一实施例的管腔支架的限位环扣的示意图;
图7是一实施例的管腔支架的束缚线未越过波谷时的示意图;
图8是本发明实施例之二提供的管腔支架处于半释放状态时的示意图;
图9是图8所示管腔支架的B部放大图;
图10是图9所示管腔支架完全展开时的示意图;
图11是本发明实施例之三提供的管腔支架处于半释放状态时的示意图;
图12是图11所示管腔支架的C部放大图;
图13是图11所示管腔支架完全展开时的示意图;
图14是一实施例的管腔支架的成对设置的束缚线的锁定部位于限位杆轴向不同位置时的示意图;
图15是图14示出的成对设置的束缚线将限位杆拉至弯曲示意图;
图16是一实施方式的管腔支架中,成对设置的束缚线的锁定部相对限位杆的连接示意图;
图17是另一实施方式的管腔支架中,成对设置的束缚线的锁定部相对限位杆的连接示意图。
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。
需要说明的是,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,本申请实施例提供的一种管腔支架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、束缚线22和限位扣23。限位杆21位于管状主体11外,束缚线22和限位扣23均设于管状主体11上。
管状主体11包括沿圆周方向分布的束缚区111和非束缚区112,束缚线22设置在束缚区111,束缚线22包括相连接的固定端22a、束缚部22b和锁定部22c。固定端22a与管状主体11固定连接。结合图2所示,锁定部22c和限位扣23均以可分离的方式与限位杆21连接,当锁定部22c和限位扣23均与限位杆21连接时,束缚线22对束缚区111进行周向约束。请参阅图3,当限位杆21与锁定部22c和限位扣23分离时,限位杆21对锁定部22c的束缚解除,继而束缚线22解除对束缚区111的周向约束,管状主体11完全展开。
由于束缚线22通过固定端22a固定在管状主体11上,当限位杆21对锁定部22c的束缚解除时,该固定端22a可避免束缚线22脱离管腔支架100进入下游血管。
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。
非束缚区112所覆盖的圆周角度为180°~340°,也就是说,束缚区111覆盖的圆周角度为20°~180°,以便将束缚线22对束缚区111的周向约束幅度控制在合理的范围内,以利于对处于半释放状态的管腔支架100进行轴向和周向的调整。
非束缚区112内设有分支开口(图未示),且该分支开口的边沿设有显影结构,当半释放装置20对束缚区111进行束缚时,非束缚区112内的分支开口处于完全展开的状态,当对分支开口的位置进行定位时,处于展开状态的分支开口及显影结构定位更加精准。通过使得半释放装置20仅对束缚区111进行束缚,尤其利于带分支开口的管腔支架的定位。
请参阅图4,半释放装置20还包括限位环扣24,限位环扣24设置在管状主体11的外表面,束缚线22从限位环扣24中穿设,可使束缚线22均匀压缩管状主体11,提高支架整体定位的准确性。并且,当管腔支架100被压缩在输送鞘管内或束缚线22对管腔支架100的约束解除后,该限位环扣24还可避免束缚线22发生轴向移位。当然,在其他实施例中,限位环扣24也可以设置在管状主体11的内表面。
需要说明的是,管腔支架100形成管状主体11的结构具有多种可能,只要管腔支架100形成中空的管腔结构,以利用管腔支架100的管腔构成血流流通的通道即可。
在一些实施方式中,管状主体11包括多圈波形环状物101(如图6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。
多圈波形环状物101上连接有覆膜102。其中,多圈波形环状物101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。
限位环扣24的尺寸为束缚线22横截面积的100%~200%,限位环扣24尺寸过大则束缚线22轴向可移动范围大,影响支架径向压缩效果;限位环扣24尺寸过小则会增大限位环扣24和束缚线22相互间的摩擦力,影响束缚线22与限位环扣24的沿管状主体11的周向相对运动,不利于管腔支架100顺利展开。
限位环扣24的数量可以是多个,多个限位环扣24沿管状主体11的周向均匀分布在束缚区111处,从而利用多个限位环扣24将束缚线22挂设在管状主体11的外表面,对束缚线22起到良好的限位效果,以提升束缚线22对束缚区111周向约束的稳定性及精准性。
请参阅图5,若两个限位环扣24的间距过长,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处于松散状态,两个限位环扣24之间的束缚线22会轴向移位,甚至越过波形环状物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,束缚线22钩挂在波形环状物101上,会导致管腔支架100无法正常展开。
请参阅图6,在自然状态下(即管腔支架100完全释放时),相邻的两个限位环扣24在沿管状主体11周向上的距离为m,也就是说,管状主体11的位于该相邻的两个限位环扣24的部分结构的弧长,限位环扣24的固定点与位于该限位环扣24下方、且距该限位环扣24最近的波谷之间的垂直距离为n,其中m与n满足m≤2n。请参阅图7,管腔支架100在输送鞘管内处于完全径向压缩状态时,可以避免管腔支架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,如图1所示,束缚线22的数量为多条,多条束缚线22沿轴向间隔分布。束缚线22可以为抗拉伸性能强的柔性线,如PTFE线或聚酯缝合线等。固定端22a可通过打结等方式固定在覆膜102或多圈波形环状物101。束缚线22的束缚部22b可以由单根柔性线组成,也可以由多根柔性线组成。锁定部22c可选择但不限于束缚线环、金属环等。限位环扣24均设置在波形环状物101上,不仅有利于引导穿设在限位环扣24内的束缚线22径向压缩支架,还可降低束缚线22对覆膜的损伤风险。优选的,限位环扣24位于波形环状物101的连接杆的中部,以使波形环状物101的受力均匀。
限位杆21可选择具有较好弹性记忆、表面粗糙度较小的金属导丝,例如镍钛丝,其物理性满足要求,且与人体的生物相容性较好。限位杆21的直径可选择0.2mm~0.6mm,以使得限位杆21的直径适宜。避免限位杆21的直径过大而增大管腔支架100整体的profile(即,通过面积),限位杆21的直径过大则支撑力不足,影响对锁定部22c和限位扣23的约束效果。
在一些实施方式中,限位杆21的表面粗糙度小于或等于0.2μm,以便限位杆21顺畅地从锁定部22c和限位扣23抽出,从而解除对锁定部22c和限位扣23的约束。
在一些实施方式中,限位杆21的近端设置有导向头(图未示),导向头用以引导限位杆21穿过限位扣23,并且利用导向头减轻限位杆21对血管造成损伤。
在一些实施方式中,导向头为设置在限位杆21的近端的软头;从而利用软头避免限位杆21的近端对血管造成损伤。具体地,软头的长度设置为10mm~20mm,这种设置,既可以维持限位杆21对锁定部22c和限位扣23的约束,同时能够避免限位杆21对血管造成损伤。软头过长易导致部分软头处于限位杆21对束缚线22的约束位置,这样可能就会因软头的支撑性不足而导致锁定部22c或限位扣23从限位杆21松脱。软头过短,则软头的柔性不足,容易损伤血管。
在另一些实施方式中,导向头为形成于限位杆21的近端的球头,例如,采取金属导丝制作限位杆21时,可以通过点焊处理的方式在限位杆21的近端形成球头。
球头的直径可以是且为限位杆21的直径的100%~150%。弹性记忆较差的导丝在受力之后容易弯折,则会导致抽离导丝时阻力增大;球头的直径0.3mm~0.6mm
导丝丝径不宜过大或过小,过大则会增大支架整体profile(侧影),过小则支撑力不足以约束长线扣两端。导丝近端球头的直径小于0.3mm易刺伤血管,直径大于导丝丝径150%则会导致导丝抽离时靠近球头位与长线扣之间形成卡扣无法顺利松脱。
请参阅图8、图9和图10,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100大体上相同,管腔支架100包括管状主体11,及连接在该管状主体11外表面的半释放装置20,半释放装置20包括位于管状主体11外的限位杆21,以及缠绕在管状主体11外的束缚线22。
实施例之二与实施例之一的不同之处在于,半释放装置20包括至少一组成对设置的束缚线22,且沿管状主体11的周向上,成对设置的束缚线22的固定端22a分别位于限位扣23的两侧。
本实施例通过成对设置的束缚线22,当限位杆21与成对设置的束缚线22的锁定部22c分离时,成对设置的束缚线22可同时解除对管状主体11的束缚区111的束缚,使管腔支架100更加快速的展开贴壁。同时,由于成对设置的束缚线22的固定端22a分别位于限位扣23的两侧,从而成对设置的束缚线22释放对管状主体11的束缚区111的束缚时,束缚区111朝位于限位扣23两侧的固定端22a展开,即束缚区111沿管腔支架100的周向朝两个相反的方向展开,从而抵消管腔支架100展开过程自身产生的周向力,以此提高管腔支架100释放稳定性,使得定位更加精准。
成对设置的束缚线22的长度之比为T1,成对设置的束缚线22的固定端22a至限位扣23的中心轴线的距离之比为T2,T1=T2。其中,限位扣23的中心轴线可以由穿设于限位扣23的限位杆21来界定,确切的说,不考虑限位杆21在限位扣23内的活动所引起的限位杆21的纵向轴线相对管状主体11的形位误差的情况下,限位杆21的纵向轴线与限位扣23的中心轴线重合。该实施例中,将成对设置的束缚线22的长度比设置成与它们的固定端22a到限位扣23的中心轴线的距离比相等,从而使得成对设置的束缚线22同时释放对束缚区111的周向约束时,束缚区111朝两个相反方向展开的周向力能够被很好的抵消。
例如,在一些实施方式中,成对设置的束缚线22的长度相等,沿管状主体11的周向上,成对设置的束缚线22的固定端22a到限位扣23的距离相等。通过这种结构设置,成对设置的束缚线22对束缚区111进行周向约束的程度相当,从而当限位杆21与成对设置的束缚线22的锁定部22c分离时,成对设置的束缚线22同时释放对束缚区111的周向约束,束缚区111朝两个相反方向展开的周向力大小基本相等,从而能够被很好的抵消,使得管腔支架100释放更稳定,定位更精准。
可以理解的是,本申请并不限定成对设置的束缚线22的组数,例如,如图8所示,半释放装置20包括3组成对设置的束缚线22。在其他实施方式中,半释放装置20还可以设置2组或2组以上的束缚线22。或者,半释放装置20除了包括成对设置的束缚线22,还可以设置非成对设置的束缚线22,实现部分束缚线22成对设置,另一部分束缚线22非成对设置,提高对束缚区111进行轴向约束过程的灵活性。
请参阅图11、图12和图13,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100大体上相同,管腔支架100包括管状主体11,及连接在该管状主体11外表面的半释放装置20。
实施例之三与实施例之一的不同之处在于,当成对设置的束缚线22在限位杆21的周向限位下对束缚区111周向约束时,成对设置的束缚线22的锁定部22c彼此轴向限位,确保成对设置的束缚线22的锁定部22c对限位杆21施加作用力的位置一致,以避免成对设置的束缚线22对限位杆21所施加的作用力不是在限位杆21轴向上的同一位置而出现限位杆21弯曲偏移的风险,通过这种结构设置,在限位杆21处于对成对设置的束缚线22进行约束状态时,成对设置的束缚线22能够稳定地将束缚区111维持在压缩状态,从而有效提高管腔支架100的整体稳定性。
锁定部22c为束缚线22卷绕形成的圆环或半圆环结构,当成对设置的束缚线22在限位杆21的周向限位下对束缚区111周向约束时,成对设置的束缚线22的锁定部22c互不钩挂,从而在限位杆21与限位扣23分离时,成对设置的束缚线22彼此分离,以满足释放对束缚区111的周向约束的需要。
结合图16和17所示,成对设置的束缚线22中,套设于限位杆21的束缚线22具有2个牵引段221,2个牵引段221中的至少一个从另一个束缚线22的锁定部22c穿设。
需要说明的是,在锁定部22c呈圆环结构时,成对设置的束缚线22的锁定部22c仅一个套设于限位杆21并从另一个束缚线22的锁定部22c穿设,这样,成对设置的束缚线22均束缚于限位杆21,且沿限位杆21的轴向彼此限位,也就是说,这种结构设置下,成对设置的束缚线22的锁定部22c束缚于统一位置,且彼此不会沿轴向相对移动,从而可以避免成对设置的束缚线22对限位杆21所施加的作用力不是在限位杆21轴向上的同一位置而出现限位杆21弯曲偏移的风险。
例如,如图14和图15所示,若两个束缚线22彼此之间未沿限位杆21的轴向彼此约束时,两个束缚线22对限位杆21施加相反的作用力,则两个束缚线22的锁定部22c之间由于彼此不受约束而能够沿限位杆21的轴向相对运动,这样两个束缚线22对限位杆21轴上的作用位置可能不同而将限位杆21拉弯曲,影响限位杆21将管腔支架100约束在半释放状态下的稳定性。
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 (10)
1.一种管腔支架,包括管状主体,以及连接在所述管状主体上的半释放装置,其特征在于,所述半释放装置包括位于所述管状主体外的限位杆以及设于所述管状主体上的束缚线和限位扣,所述管状主体包括沿圆周方向分布的束缚区和非束缚区,所述束缚线设置在所述束缚区,所述束缚线包括相连接的固定端、束缚部和锁定部,所述固定端与所述管状主体固定连接,所述锁定部和所述限位扣均以可分离的方式与所述限位杆连接,当所述锁定部和所述限位扣均与所述限位杆连接时,所述束缚线对所述束缚区进行周向约束。
2.根据权利要求1所述的管腔支架,其特征在于,所述半释放装置还包括限位环扣,所述限位环扣设置在所述管状主体的外表面,所述束缚线从所述限位环扣中穿设。
3.根据权利要求2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;
所述限位环扣的数量为多个,在自然状态下,相邻的两个所述限位环扣在沿所述管状主体周向上的距离为m,所述限位环扣的固定点与位于所述限位环扣下方、且距所述限位环扣最近的波谷之间的垂直距离为n,m与n满足m≤2n。
4.根据权利要求1所述的管腔支架,其特征在于,所述半释放装置包括至少一组成对设置的所述束缚线,且沿所述管状主体的周向上,成对设置的所述束缚线的固定端分别位于所述限位扣的两侧。
5.根据权利要求4所述的管腔支架,其特征在于,成对设置的所述束缚线的长度之比为T1,成对设置的所述束缚线的固定端至所述限位扣的中心轴线的距离之比为T2,T1=T2。
6.根据权利要求4所述的管腔支架,其特征在于,成对设置的所述束缚线的长度相等,且沿所述管状主体的周向上,成对设置的所述束缚线的固定端到所述限位扣的距离相等。
7.根据权利要求4至6中任意一项所述的管腔支架,其特征在于,当成对设置的所述束缚线在所述限位杆的周向限位下对所述束缚区周向约束时,成对设置的所述束缚线的锁定部彼此轴向限位。
8.根据权利要求7所述的管腔支架,其特征在于,所述锁定部为所述束缚线卷绕形成的圆环或半圆环结构,当成对设置的所述束缚线在所述限位杆的周向限位下对所述束缚区周向约束时,成对设置的所述束缚线的锁定部互不钩挂,以在所述限位杆与所述限位扣分离时,成对设置的所述束缚线彼此分离。
9.根据权利要求7所述的管腔支架,其特征在于,成对设置的所述束缚线中,套设于所述限位杆的所述束缚线具有2个牵引段,2个所述牵引段中的至少一个从另一个所述束缚线的锁定部穿设。
10.根据权利要求1所述的管腔支架,其特征在于,所述限位杆的近端设有导向头,且所述导向头的在限位杆的径向上的尺寸与所述限位杆的直径的比值为1~1.5。
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