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CN105662649A - Stent type blood vessel allowing branches to be inserted and connected easily - Google Patents

Stent type blood vessel allowing branches to be inserted and connected easily
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CN105662649A
CN105662649ACN201610123214.7ACN201610123214ACN105662649ACN 105662649 ACN105662649 ACN 105662649ACN 201610123214 ACN201610123214 ACN 201610123214ACN 105662649 ACN105662649 ACN 105662649A
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stent
blood flow
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郭伟
马晓辉
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Chinese PLA General Hospital
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Abstract

Translated fromChinese

本发明公开一种易于插接分支的支架型血管,包括管状主体血管支架,主体血管支架远端口由一个带凹陷区的密封面密封,密封面上设置有血流口;在所述凹陷区的斜面或底部上至少设有一个与外接分支血管对接的衔接血流口。通过这个发明使累及重要分支的主动脉瘤腔内治疗成为可能,同时简化了手术操作,降低了手术风险。

The invention discloses a stent-type blood vessel that is easy to insert and connect branches, comprising a tubular main body vascular stent, the distal port of the main body vascular stent is sealed by a sealing surface with a recessed area, and a blood flow port is arranged on the sealing surface; in the recessed area The inclined surface or the bottom is provided with at least one connecting blood flow port connected with the external branch blood vessel. Through this invention, the intracavitary treatment of aortic aneurysm involving important branches is possible, and at the same time, the operation operation is simplified and the operation risk is reduced.

Description

Translated fromChinese
一种易于插接分支的支架型血管A stent-type blood vessel that is easy to insert and connect branches

技术领域technical field

本发明涉及可植入血管技术领域,具体涉及一种易于插接分支的支架型血管。The invention relates to the technical field of implantable blood vessels, in particular to a stent-type blood vessel that is easy to insert and connect branches.

背景技术Background technique

主动脉瘤是指主动脉壁局部或弥漫性的异常扩张,压迫周围器官而引起症状,危险性在于瘤体的破裂,常发生在升主动脉、主动脉弓、胸部降主动脉、胸腹主动脉和腹主动脉。Aortic aneurysm refers to local or diffuse abnormal expansion of the aortic wall, causing symptoms by compressing surrounding organs. abdominal aorta.

主动脉瘤可以通过外科手术的方法治疗,也可以采用介入手术治疗。采用外科手术的风险性大,且并非所有患者都能承受外科手术,采用介入手术治疗,使利用输送系统将支架型血管运送至病变部位,利用支架自身的弹性,使支架型血管扩张,从而将病变部位如动脉瘤或动脉夹层的裂口隔绝在支架型血管的管腔外,完成对血管病变部位的修复。由于主动脉弓部主动脉瘤和胸腹主动脉瘤通常分别累及弓上分支动脉(颈动脉/锁骨下动脉)和内脏/肾动脉,腔内介入治疗时必须保证这些重要分支动脉的通畅性,因此腔内重建这些重要的分支动脉成为解决问题的关键。Aortic aneurysms can be treated surgically or by interventional procedures. The risk of surgery is high, and not all patients can bear surgery. Interventional surgery is used to transport the stent-type blood vessels to the lesion by using the delivery system, and use the elasticity of the stent itself to expand the stent-type blood vessels, so that the Lesions, such as aneurysms or arterial dissection, are isolated from the lumen of stent-type blood vessels to complete the repair of vascular lesions. Since aortic arch aortic aneurysms and thoracoabdominal aortic aneurysms usually involve supraarchal branch arteries (carotid/subclavian arteries) and visceral/renal arteries respectively, the patency of these important branch arteries must be ensured during endovascular intervention. Internal reconstruction of these important branch arteries becomes the key to solving the problem.

现有技术中,支架型血管分为直型、分支/叉型等,其中分支/叉型血管支架包括一体式结构和分体式结构,分体式结构一般由主体支架和分支支架多个模块组成,在使用时,输送系统先释放主体支架,再将分支支架输送至指定位置,释放后与主体支架相对接。In the prior art, stent-type blood vessels are divided into straight type, branch/fork type, etc., among which the branch/fork type vascular stent includes an integrated structure and a split structure. The split structure is generally composed of multiple modules of a main body stent and a branch stent. When in use, the delivery system first releases the main support, then transports the branch support to a designated position, and then docks with the main support after release.

现有分体式结构的支架型血管,通常在主体支架的侧壁上设置与分支支架相配合的插口,使用方式是通过介入手术先完成主体支架的释放,然后将分支支架的对接至主体支架插口处。实际手术过程中发现,将压缩的主体支架通过介入鞘管在血管内释放的过程中,同时控制支架侧壁上的开口对准分支血管口,是难度非常高的过程,同时风险巨大,若应没有对准反而因主体支架侧壁挡住分支血管,如:遮挡颈动脉血管造成中风或死亡、遮挡住内脏或肾动脉可造成脏器坏死。如何在主动脉分支位置,安全、有效、快速的放置主动脉支架型血管,即隔绝主动脉瘤又能保证重要分支血管的通畅性是亟待解决的问题。For existing stent-type blood vessels with a split structure, sockets that match the branch stents are usually provided on the side wall of the main stent. The method of use is to complete the release of the main stent through interventional surgery, and then connect the branch stents to the sockets of the main stent place. During the actual operation, it was found that during the process of releasing the compressed main body stent in the blood vessel through the interventional sheath, it is very difficult and risky to control the opening on the side wall of the stent to align with the opening of the branch vessel. If it is not aligned, the side wall of the main body stent blocks the branch blood vessels. For example, blocking the carotid artery can cause stroke or death, and blocking the visceral or renal artery can cause organ necrosis. How to safely, effectively and quickly place aortic stent-type blood vessels at the branch position of the aorta, that is, isolate the aortic aneurysm and ensure the patency of important branch blood vessels is an urgent problem to be solved.

发明内容Contents of the invention

本发明提供了一种易于插接分支的支架型血管,外接分支血管易于与主体血管对接,降低介入手术的难度,同时提高手术安全性降低手术风险。The present invention provides a stent-type blood vessel that is easy to insert and connect branches, and the externally connected branch blood vessels are easy to be connected with the main blood vessel, thereby reducing the difficulty of interventional operations, improving surgical safety and reducing surgical risks.

本发明为一种易接分支的支架型血管,包括一个管状主体血管支架,,主体血管支架远端口由一个带凹陷区的密封面密封,密封面上设置有血流口;凹陷区的斜面或底部上至少设有一个与外接分支血管对接的衔接血流口,凹陷区的密封面为导向面。The present invention is a stent-type blood vessel that is easy to connect to branches, comprising a tubular main body vascular stent, the distal port of the main body vascular stent is sealed by a sealing surface with a concave area, and a blood flow port is arranged on the sealing surface; the slope of the concave area or The bottom is provided with at least one connecting blood flow port connected with the external branch blood vessels, and the sealing surface of the concave area is a guiding surface.

采用上述技术方案,由于对接外接分支的血流口的位于主体血管支架的端口面,只要控制主体支架端头位置,就控制了血流口位置;由于支架的端口位置在影像仪器下的易显影性、手术过程中的易操控性,很容易实现对支架端口的精准释放,继而解决了主体血管支架对接血流口准确释放至所需位置的问题,提高了手术效率。With the above technical solution, since the blood flow port of the butt joint external branch is located on the port surface of the main body vascular stent, as long as the position of the end of the main body stent is controlled, the position of the blood flow port is controlled; It is easy to realize the precise release of the stent port, which solves the problem of accurate release of the blood flow port of the main blood vessel stent to the required position, and improves the operation efficiency.

衔接血流口位于密封面的凹陷区内,凹陷区倾斜侧面形成驱动物体向斜面内最低位置引导的导向力,当血流口位于侧面或底部时,导向力将辅助导引丝等穿接物进入血流口。The connecting blood flow port is located in the recessed area of the sealing surface, and the inclined side of the recessed area forms a guiding force that drives the object to guide to the lowest position in the inclined plane. When the blood flow port is located on the side or bottom, the guiding force will assist the guide wire and other piercing objects into the bloodstream.

进一步设置:上述凹陷区,Further set: the above-mentioned recessed area,

可以为,密封面整体向主体血管支架内侧凹陷形成凹陷区。It may be that the entire sealing surface is recessed toward the inner side of the main body vessel stent to form a recessed area.

或者为,密封面包括一个向主体血管支架内凹陷的凹陷区,和一个平面区。Alternatively, the sealing surface includes a recessed area that is recessed into the stent of the main blood vessel, and a plane area.

还可以为,密封面包括两个向主体血管支架内凹陷的凹陷区,和一个平面区。It may also be that the sealing surface includes two recessed areas that are recessed into the stent of the main blood vessel, and a plane area.

采用上述技术方案:凹陷区可主体支架释放位置和对接分支支架的相对位置进行调整设计。将主体血流口和衔接血流口都置于凹陷区内;仅衔接血流口置于凹陷区内;衔接血流口置于不同的凹陷区内。Adopting the above-mentioned technical solution: the recessed area can be designed by adjusting the release position of the main support and the relative position of the docking branch support. Both the main blood flow port and the connecting blood flow port are placed in the depressed area; only the connecting blood flow port is placed in the depressed area; and the connecting blood flow port is placed in different depressed areas.

进一步设置:主体血管内设有与血流口连接的内置分支血管,一个内置分支血管远端头与至少连接一个血流口连接,内置分支血管近端头位于所述主体血管支架内。Further setting: the main blood vessel is provided with a built-in branch blood vessel connected to the blood flow port, a distal end of a built-in branch blood vessel is connected to at least one blood flow port, and a proximal head of the built-in branch blood vessel is located in the main blood vessel stent.

衔接血流口与内置分支血管一对一连通。The connecting blood flow port is in one-to-one communication with the built-in branch blood vessels.

内置分支血管近端口延伸至主体血管支架近端口,所述内置分支血管近端口外周和主体近端口内之间由封闭面密封。The proximal port of the built-in branch blood vessel extends to the proximal port of the main body vessel stent, and the sealing surface is sealed between the periphery of the proximal port of the built-in branch blood vessel and the interior of the proximal port of the main body.

内置分支血管为软体人工血管或带支撑骨架的血管。The built-in branch blood vessel is a soft artificial blood vessel or a blood vessel with a supporting skeleton.

采用上述技术方案:内置分支血管一方面与从血流口外接的分支血管配合,增加外接分支血管接入后的稳定性,另一方面保证了各血流血流的顺畅性。The above technical solution is adopted: on the one hand, the built-in branch blood vessels cooperate with the external branch blood vessels from the blood flow port to increase the stability of the external branch blood vessels after access, and on the other hand, ensure the smoothness of each blood flow.

内置分支血管,还可设置为:内置分支血管近端口延伸至主体血管内,所述内置分支血管近端口外周和主体血管支架内侧壁之间由封闭面密封。The built-in branch blood vessel can also be set as follows: the proximal port of the built-in branch blood vessel extends into the main blood vessel, and the sealing surface is sealed between the periphery of the proximal port of the built-in branch blood vessel and the inner wall of the main body vascular stent.

采用上述技术方案:内置分支血管未延伸的主体支架部分,可减少主体支架压缩时的部分压缩直径,减少局部压缩尺寸。Adopting the above technical solution: the part of the main body stent that is not extended by the built-in branch blood vessel can reduce the partially compressed diameter of the main body stent when compressed, and reduce the local compressed size.

本发明从远端口内的衔接血流口接入分支血管,无需去严格控制主体支架的轴向位置和周向角度,无需担心未准确对准支架侧壁的血流口与人体分支血管口,造成分支血流口被阻挡而导致的严重后果,使手术过程简单且减少风险。衔接血流口位于主体血管支架远端口的凹陷封闭面上,封闭面的阻挡性凹陷性同时形成了对分支血管接入时对牵引导丝的引导性,市导引牵引导丝进入衔接血流口更加快捷。通过腔内介入的方法重建受累及的重要的主动脉分支,解决主动脉弓部主动脉瘤和内脏动脉区域主动脉瘤。使用时先讲主体易接分支的支架型血管放入受累分支动脉的近端。对累及弓上分支的主动脉弓动脉瘤放置在升主动脉,然后经过颈动脉、股动脉分别建立与易接分支支架型血管的联接轨道,通过另外的支架型血管桥接主体支架实现分支动脉的重建。对累及内脏动脉或肾动脉的胸腹主动脉瘤,将主体易接分支的支架型血管放置在腹腔动脉上方的降主动脉,同时用另一枚主体易接分支的支架型血管与第一枚对接,从而形成四条内嵌的分支。然后通过这四条内嵌的分支分别与腹腔动脉、肠系膜上动脉、右肾动脉和左肾动脉桥接,从而实现重要分支的重建和动脉瘤的隔绝。The present invention accesses branch blood vessels from the connecting blood flow port in the distal port, without strictly controlling the axial position and circumferential angle of the main body stent, and without worrying about not accurately aligning the blood flow port on the side wall of the stent with the branch blood vessel port of the human body. Serious consequences caused by blocking the branch blood flow port make the operation process simple and reduce the risk. The connecting blood flow port is located on the concave sealing surface of the distal port of the main vascular stent, and the blocking and concave nature of the sealing surface also forms the guiding property for the traction guide wire when the branch blood vessel is connected, and guides the traction guide wire into the connecting blood flow Mouth is faster. The affected important aortic branches are reconstructed by endovascular intervention, and the aortic aneurysms in the aortic arch and visceral arteries are resolved. When in use, the stent-type blood vessel that the main body is easy to connect to the branch is put into the proximal end of the affected branch artery. The aortic arch aneurysm involving the upper arch branch is placed in the ascending aorta, and then the connection tracks with the easily accessible branch stent-type vessels are established respectively through the carotid artery and the femoral artery, and the reconstruction of the branch arteries is realized by bridging the main stent with another stent-type vessel. For thoracoabdominal aortic aneurysms involving visceral arteries or renal arteries, place a stent-type vessel with easily accessible branches on the descending aorta above the celiac artery, and at the same time use another stent-type vessel with easily accessible branches to connect with the first one Butt, thus forming four embedded branches. Then, the four embedded branches were respectively bridged with the celiac artery, superior mesenteric artery, right renal artery, and left renal artery, so as to realize the reconstruction of important branches and the isolation of the aneurysm.

通过这个发明使累及重要分支的主动脉瘤腔内治疗成为可能,同时简化了手术操作,降低了手术风险。Through this invention, the intracavitary treatment of aortic aneurysm involving important branches is possible, and at the same time, the operation operation is simplified and the operation risk is reduced.

附图说明Description of drawings

图1为本发明易于插接分支的支架型血管的第一种实施方式示意图;Fig. 1 is a schematic diagram of the first embodiment of the stent-type blood vessel that is easy to plug into branches of the present invention;

图2为本发明易于插接分支的支架型血管的第二种实施方式示意图;Fig. 2 is a schematic diagram of the second embodiment of the stent-type blood vessel that is easy to plug into the branch of the present invention;

图3为本发明易于插接分支的支架型血管的第三种实施方式示意图;Fig. 3 is a schematic diagram of a third embodiment of a stent-type blood vessel that is easy to plug into a branch of the present invention;

图4为本发明易于插接分支的支架型血管的第四种实施方式示意图;Fig. 4 is a schematic diagram of a fourth embodiment of a stent-type blood vessel that is easy to plug into a branch of the present invention;

图5为本发明易于插接分支的支架型血管的第五种实施方式示意图;Fig. 5 is a schematic diagram of a fifth embodiment of a stent-type blood vessel that is easy to plug into a branch of the present invention;

图6为两个易于插接分支组合示意图。Fig. 6 is a schematic diagram of the combination of two easy-to-plug branches.

具体实施方式detailed description

下面结合附图,对本发明易于插接分支的支架型血管做详细描述。The following is a detailed description of the stent-type blood vessel that is easy to insert and branch in accordance with the accompanying drawings.

实施例1Example 1

如图1所示,本实施例提供的支架型血管,包括有覆膜支架构成的主体血管支架1,在主体血管支架离心脏较远的一端(下简称远端)A由密封面111密封,密封面111向主体血管支架内凹陷,凹陷区斜面上圆周分部有三个血流口21、22、23,分别为一个主血流口21和两个衔接血流口22、23,主血流口直径大于衔接血流直径。支撑骨架211、221、223撑扩三个血流口外周,三个支撑骨架211、221、223两两相切并连接、并分别与远端口A外周支架相切并连接、且延密封面111凹陷方向倾斜,将衔接血流口稳定定位于凹陷的密封面111上。As shown in Figure 1, the stent-type blood vessel provided by this embodiment includes a main body vascular stent 1 composed of a covered stent, and the end (hereinafter referred to as the distal end) A of the main body vascular stent farther from the heart is sealed by a sealing surface 111, The sealing surface 111 is recessed into the main body vascular stent, and there are three blood flow ports 21, 22, 23 on the circumference of the inclined surface of the recessed area, which are respectively a main blood flow port 21 and two connecting blood flow ports 22, 23. The diameter of the orifice is greater than the diameter of the articulating blood flow. The support frames 211, 221, 223 expand the periphery of the three blood flow ports, and the three support frames 211, 221, 223 are tangent and connected in pairs, and are respectively tangent and connected to the peripheral bracket of the distal port A, and extend the sealing surface 111 The direction of the depression is inclined to stably position the connecting blood flow port on the sealing surface 111 of the depression.

实施例2Example 2

如图2所示,本实施例提供的支架型血管,包括有覆膜支架构成的主体血管支架1,远端口A由密封面111密封,密封面111向主体血管支架内凹陷,凹陷区斜面上圆周分部有三个血流口21、22、23,分别为一个主血流口21和两个衔接血流口22、23,主血流口直径大于衔接血流直径。支撑骨架210、220、220撑扩三个血流口外周,三个支撑骨架210、220、220两两相切并连接、并分别与远端口A外周支架相切并连接、且延密封面111凹陷方向倾斜,将衔接血流口稳定定位于凹陷的密封面111上。三个平行设置于主体血管内的内置分支血管211、221、131,内置分支血管近端口212、222、232由支撑骨架2100、2200、2200扩口且两两相切连接,与近端口C外周处于同一平面并相切连接,所述内置分支血管近端口外周和主体血管支架内侧壁之间间隙由封闭面130密封。内置分支血管211、221、131为软体人工血管或带支撑骨架的血管。封闭面130可为平面或延主体血管轴方向内凹或外凸。As shown in Figure 2, the stent-type blood vessel provided by this embodiment includes a main body vascular stent 1 composed of a covered stent, the distal port A is sealed by a sealing surface 111, and the sealing surface 111 is recessed into the main body vascular stent, and the slope of the concave area is There are three blood flow ports 21 , 22 , 23 in the circumferential division, which are respectively a main blood flow port 21 and two connecting blood flow ports 22 , 23 . The diameter of the main blood flow port is larger than that of the connecting blood flow. The support frames 210, 220, 220 expand the periphery of the three blood flow ports, and the three support frames 210, 220, 220 are tangent and connected in pairs, and are respectively tangent and connected to the peripheral support of the distal port A, and extend the sealing surface 111 The direction of the depression is inclined to stably position the connecting blood flow port on the sealing surface 111 of the depression. Three built-in branch blood vessels 211, 221, 131 are arranged in parallel in the main blood vessel, and the near ports 212, 222, 232 of the built-in branch blood vessels are flared by the support frame 2100, 2200, 2200 and connected in tangent, and are connected to the outer periphery of the near port C Being on the same plane and connected tangentially, the gap between the proximal port periphery of the built-in branch blood vessel and the inner wall of the main blood vessel stent is sealed by the sealing surface 130 . The built-in branch blood vessels 211, 221, 131 are soft artificial blood vessels or blood vessels with supporting skeletons. The sealing surface 130 can be flat or concave or convex along the axis of the main blood vessel.

本发明在使用时,主体血管支架1在体内先行释放,手术过程通过影像设备里观察判断主体血管支架1释放位置,本发明只需确定主体血管支架1远端A位置与待接分支血管口的配合位置,就对远端口A内的衔接血流口21、22、23进行了定位。无需去严格控制主体支架的轴向位置和周向角度,无需担心未准确对准支架侧壁的血流口与人体分支血管口,造成分支血流口被阻挡而导致的严重后果,使手术过程简单且减少风险。手术过程中,在外接分支血管接入本发明主体血管支架1上前,牵引导丝需先行进入衔接血流口22、23内,形成外接分支血管接入轨道。衔接血流口位于主体血管支架远端口的向内凹陷的封闭面111上,封闭面的阻挡性和凹陷形状对进入远端口A内的牵引导丝的具有引导性,牵引导丝碰触到凹陷封闭面111的斜面后,将延斜面向凹陷区滑移,穿接入斜面上的衔接血流口内,提高了导丝穿插效率。When the present invention is in use, the main vascular stent 1 is released first in the body, and the release position of the main vascular stent 1 is judged by observing the imaging equipment during the operation process. The present invention only needs to determine the position of the distal end A of the main vascular stent 1 and the opening of the branch vessel to be connected. Cooperating with the position, the connecting blood flow ports 21, 22, 23 in the distal port A are positioned. There is no need to strictly control the axial position and circumferential angle of the main body stent, and there is no need to worry about not accurately aligning the blood flow port on the side wall of the stent with the branch blood vessel port of the human body, resulting in serious consequences caused by blocking the branch blood flow port, making the surgical process Simple and less risky. During the operation, before the externally connected branch vessels are connected to the main vessel stent 1 of the present invention, the traction guide wire needs to first enter the connecting blood flow ports 22 and 23 to form the externally connected branch vessel access tracks. The connecting blood flow port is located on the inwardly concave sealing surface 111 of the distal port of the main vessel stent. The blocking surface and the concave shape of the sealing surface are guiding for the traction guide wire entering the distal port A, and the traction guide wire touches the depression After the inclined surface of the sealing surface 111, the inclined surface slides in the concave area, and penetrates into the connecting blood flow port on the inclined surface, thereby improving the insertion efficiency of the guide wire.

导引牵引导丝进入衔接血流口,加快牵引导丝与衔接血流口的穿入速速,提高手术效率。外接分支血管远端顺着牵引导丝与衔接血流口对接后释放,与内置分支血管配合定位。Guide the traction wire into the connecting blood flow port, speed up the penetration speed of the traction guide wire and the connecting blood flow port, and improve the operation efficiency. The distal end of the external branch blood vessel is released along the traction guide wire after docking with the connecting blood flow port, and is positioned in coordination with the built-in branch blood vessel.

实施例3Example 3

如图3所示,本实施例提供的支架型血管,覆膜支架构成的主体血管支架1的远端口A上的密封面111的外环侧边,设有一个向主体血管支架内凹陷的凹陷区112a,凹陷区112a为封闭面111塑膜定型或支撑骨架定型,两个衔接血流口22、23位于凹陷区112a底部;密封面111的其他区面112与远端口A外周处于一个平面内,主血流口21位于该区面内。As shown in Figure 3, in the stent-type blood vessel provided by this embodiment, the outer ring side of the sealing surface 111 on the distal port A of the main vessel stent 1 composed of the stent-graft is provided with a depression that sags into the main vessel stent Area 112a, the recessed area 112a is shaped by the plastic film of the sealing surface 111 or the supporting frame, and the two connecting blood flow ports 22, 23 are located at the bottom of the recessed area 112a; the other area 112 of the sealing surface 111 is in a plane with the outer periphery of the distal port A , the main blood flow port 21 is located in this area.

实施例4Example 4

如图3所示,本实施例提供的支架型血管,主体血管支架1的远端口A的密封面111的外环侧边,设有两个向主体血管支架内凹陷的凹陷区113a、113b,两个衔接血流口22、23分别位于凹陷区113a、113b底部;密封面111的其他区面113与远端口A外周处于一个平面内,主血流口21位于该区面内。As shown in FIG. 3 , in the stent-type blood vessel provided by this embodiment, the outer ring side of the sealing surface 111 of the distal port A of the main body vascular stent 1 is provided with two recessed areas 113a, 113b that are recessed into the main body vascular stent, The two connecting blood flow ports 22 and 23 are respectively located at the bottom of the recessed areas 113a and 113b; the other area 113 of the sealing surface 111 is in a plane with the outer periphery of the distal port A, and the main blood flow port 21 is located in this area.

实施例5Example 5

如图5所示实施例,三个内置分支血管211、221、131近端12、222、232端延伸至主体内,近端口外周212、222、232和主体血管支架内侧壁之间由封闭面密封。In the embodiment shown in Figure 5, the proximal ends 12, 222, and 232 of the three built-in branch vessels 211, 221, and 131 extend into the main body, and there is a closed surface between the peripheries of the proximal ports 212, 222, and 232 and the inner wall of the main body vessel stent. seal.

实施例6Example 6

如图3,主体血管1可整体装配至主体血管支架2远端口A的主体血流口内,组合使用,以适应需多个外接分支的病变部位需求。As shown in FIG. 3 , the main blood vessel 1 can be integrally assembled into the main blood flow port of the distal port A of the main blood vessel stent 2 and used in combination to meet the needs of lesion sites requiring multiple external branches.

Claims (13)

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