WO2018082378A1 - 滤器 - Google Patents

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Publication number
WO2018082378A1
WO2018082378A1 PCT/CN2017/099023 CN2017099023W WO2018082378A1 WO 2018082378 A1 WO2018082378 A1 WO 2018082378A1 CN 2017099023 W CN2017099023 W CN 2017099023W WO 2018082378 A1 WO2018082378 A1 WO 2018082378A1
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WO
WIPO (PCT)
Prior art keywords
filter
telecentric
rod
flexible portion
telecentric end
Prior art date
Application number
PCT/CN2017/099023
Other languages
English (en)
French (fr)
Inventor
陈卓
刘赞
Original Assignee
先健科技(深圳)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 先健科技(深圳)有限公司 filed Critical 先健科技(深圳)有限公司
Publication of WO2018082378A1 publication Critical patent/WO2018082378A1/zh

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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
    • A61F2/01—Filters implantable into blood vessels
    • A61F2/0108—Both ends closed, i.e. legs gathered at both ends
    • 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
    • A61F2/01—Filters implantable into blood vessels
    • A61F2002/016—Filters implantable into blood vessels made from wire-like elements
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0029—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in bending or flexure capacity

Definitions

  • the invention relates to a cardiovascular medical device, in particular to a filter for filtering thrombus.
  • Pulmonary embolism has a high mortality rate, and its etiology is derived from various emboli of the systemic circulation such as thrombus-shedovenous venous filter (hereinafter referred to as filter), which has been clinically proven to be a safe and effective means for preventing pulmonary embolism, and can reduce the incidence of pulmonary embolism.
  • filter thrombus-shedovenous venous filter
  • the filter is in contact with blood and vascular endothelium for a long time, protein adsorption and platelet adhesion may occur, and thrombus may eventually form. Blockage, or lead to re-emergence of the lung; and there may be a risk of deformation, tilting, displacement, breakage, or even penetration of the blood vessel. Therefore, how to ensure the stability of the
  • the technical problem to be solved by the present invention is to provide a filter which can be stably and reliably fixed to the inner wall of a blood vessel in view of the defects of the prior art.
  • the technical solution is to provide a filter comprising a telecentric end filter, a proximal end filter, a plurality of connecting rods connecting the telecentric filter and the proximal end filter, and at least two a support rod connected to the connecting rod and located outside the connecting rod,
  • the telecentric end filter screen comprises a plurality of telecentric end filter rods, and one end of each telecentric end filter rod is connected to the connecting rod The other end of the telecentric filter rod is converged at a telecentric end to form the telecentric end filter; the telecentric end filter rod has a flexible portion when pressed along a radial direction of the filter In the case of the support rod, the telecentric end strainer rod has a bending deformation at the flexible portion toward the direction of the filter axis.
  • the flexural strength of the telecentric end filter rod at the flexible portion is lower than the bending strength of the distal portion of the telecentric end filter rod except the flexible portion.
  • the telecentric end filter rod includes a first connection to the connecting rod And a second portion connected to the first portion and forming an obtuse angle with the first portion, the flexible portion including a junction of the first portion and the second portion.
  • the flexible portion includes a groove formed by the blanking of the intermediate portion of the telecentric end filter rod.
  • the groove is a V-shaped groove, a U-shaped groove or an arc-shaped groove.
  • the flexible portion includes an opening disposed in the telecentric end filter rod.
  • the flexible portion includes a cut provided on the telecentric end filter rod.
  • the cut is a continuous or discontinuous linear cut.
  • the support rod includes a telecentric end support rod disposed adjacent to the telecentric end and a proximal end support rod disposed adjacent the proximal end.
  • the telecentric end support rod includes a guiding section extending from the connecting rod away from the filter axis and extending from the guiding section toward a direction substantially parallel to the connecting rod Support section.
  • the telecentric end support rod is further provided with a fixed anchor facing the proximal end, and the fixed anchor is located at a junction of the guiding section and the supporting section.
  • the telecentric end filter rod of the filter of the present invention is provided with a flexible portion, that is, the telecentric end filter rod has a smaller bending strength at the flexible portion than the remaining portion except the flexible portion, when the support rod of the filter is When the blood vessel is radially squeezed, the telecentric end filter rod can be deformed toward the axial direction of the filter at the flexible portion, thereby keeping the filter straight and deformed at all times, and the connecting rod is away from the blood vessel wall to prevent the connecting rod The intersection with the support rod is raised to contact the inner wall of the blood vessel.
  • FIG. 1 is a schematic perspective view of a filter according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a telecentric end filter rod in the first embodiment of the filter of the present invention
  • FIG. 3 is a schematic structural view of a telecentric end filter rod in a second embodiment of the filter of the present invention.
  • Figures 4a, 4b and 4c are enlarged views of the portion labeled 9 in Figure 3;
  • Figure 5 is a schematic view showing the structure of a telecentric end filter rod in the third embodiment of the filter of the present invention.
  • Figure 6 is an enlarged view of a portion labeled 10 in Figure 5;
  • Figure 7 is a schematic structural view of a telecentric end filter rod in a fourth embodiment of the filter of the present invention.
  • FIG. 8a and 8b are enlarged views of a portion denoted 11 in Fig. 7, respectively;
  • Figure 9 is a schematic view showing the deformation of the filter of the present invention in a blood vessel after implantation
  • Figure 10 is a schematic illustration of the deformation of a filter without a weakened structure in a blood vessel after implantation.
  • the general technical idea of the present invention is to provide a flexible portion at any position other than the end portions of the telecentric end filter rod to reduce the bending strength of the portion, so that the bending strength of the portion is lower than that of the other portions except the flexible portion. strength.
  • the flexible portion may be a portion having a lower bending strength disposed at any position other than the ends of the telecentric end of the filter rod, for example, the flexible portion may be constructed by using a softer material, or may be filtered at a telecentric end.
  • the intermediate portion of the net rod i.e., the area between the end portions
  • the technical concept of the present invention will be described in detail below through several specific embodiments:
  • a filter includes a telecentric end 1, a proximal end 2, and a filter body coupled between the telecentric end 1 and the proximal end 2.
  • the telecentric end 1 is provided with a coupling nut 11 and a recovery hook 12.
  • the coupling nut 11 is for connection to a conveyor cable.
  • a connecting nut 11 is provided on both the telecentric end 1 and the proximal end 2 .
  • the recovery hook 12 can cooperate with the capture device to remove the filter from the inferior vena cava to avoid the biological risk of long-term implantation.
  • recovery hooks 12 may be spaced apart on the outer peripheral surface of the telecentric end 1 and radiating outwardly from the telecentric end 1 in a direction away from the telecentric end 1 and directed from the telecentric end 1 to the filter body.
  • recovery hooks 12 spaced apart on the outer peripheral surface of the telecentric end 1 and radiating outwardly from the telecentric end 1 in a direction away from the telecentric end 1 and directed from the telecentric end 1 to the filter body.
  • a recycling hook at the proximal end 2 so that the filter can be recovered from both directions.
  • the filter body includes a telecentric filter 3, a proximal end filter 4, and a connecting rod 5 for connecting the telecentric filter 3 and the proximal filter 4.
  • the telecentric filter 3 includes a plurality of telecentric filter rods 31 extending from one end of the connecting rod to the telecentric end 1 and concentrating at the telecentric end 1.
  • the proximal end filter 4 includes a plurality of Y-shaped proximal end filter rods 41 extending from the other end of the connecting rod to the proximal end 2 and concentrating the proximal end 2.
  • any one of the Y-shaped near-end filter screens 41 includes a first wire 411 and two second wire 412 extending from one end of the first wire 411. The ends of the two second wires 412 are respectively adjacent to the two wires.
  • the connecting rods 5 are connected.
  • a plurality of first mesh wires 411 are collected at the proximal end 2 such that the proximal end filter 4 has a tapered mesh structure as a whole.
  • the structures of the telecentric filter 3 and the proximal end filter 4 are different from each other.
  • the filter further includes a support rod coupled to the connecting rod 5 for engaging the inner wall of the blood vessel such that the connecting rod 5 is away from the inner wall of the blood vessel without contacting the inner wall of the blood vessel.
  • the support rod ensures that the entire filter is balanced in the axial and circumferential directions, ensuring that the entire filter does not tilt or shift under the influence of blood flow and external forces.
  • the support rod includes a telecentric end support rod 6 disposed near the telecentric end 1 and a proximal end support rod 7 disposed adjacent the proximal end 2.
  • the filter is closed at both ends, and each of the distal end and the proximal end of each connecting rod 5 is provided with a support rod which is in contact with the blood vessel wall, thereby ensuring that the entire filter is balanced in both the circumferential direction and the axial direction, and the opening is solved.
  • the overall force imbalance of the filter caused by the frame structure ensures that the filter will not tilt or shift under the influence of blood flow and external force.
  • the telecentric end support rod 6 comprises a guiding section 61 extending from the connecting rod 5 in the axial direction away from the filter, the supporting section 62 extending from the guiding section 61 in a direction substantially parallel to the connecting rod 5, and the self-guide section 61 and the support
  • the anchor 62 of the segment 62 extends toward the proximal end 2 of the anchor.
  • the structure of the proximal end support rod 7 is substantially the same as that of the telecentric end support rod 6, except that there is no fixed anchor 63. In other embodiments of the present invention, the structure of the proximal end support rod 7 may be the same as that of the telecentric end support rod 6.
  • the telecentric end filter rod 31 includes a first portion 311 connected to the connecting rod 5, a second portion 312 connected to the first portion 311 and forming an obtuse angle a with the first portion 311, and a flexible portion 8.
  • the flexible portion 8 is provided at the junction of the first portion 311 and the second portion 312.
  • the flexible portion 8 is capable of changing the local bending strength of the telecentric end filter rod 31, that is, the flexible portion 8 has a smaller bending strength with respect to the remaining portion of the telecentric end net rod 31 except the flexible portion 8.
  • the telecentric end filter rod 31 When the telecentric end support rod 6 is subjected to the radial direction from the filter At the time of the squeezing, the telecentric end filter rod 31 has a bending deformation in the flexible portion 8 toward the direction of the filter axis.
  • the support section 62 of the telecentric end support rod 6 can always maintain a straight deformation within the blood vessel, thereby preventing the connecting rod 5 and the telecentric end support.
  • the joint of the rod 6 is raised to contact the inner wall of the blood vessel.
  • the flexible portion 8 can be completed by cold working, heat treatment setting or other process means.
  • FIG 9 is a schematic view showing the deformation of the filter in the blood vessel in the present embodiment after implantation.
  • the filter is implanted into the blood vessel, under the radial compressive force of the blood vessel wall 10,
  • the telecentric end filter rod 31 is deformed at the flexible portion 8, so that the telecentric end support rod 6 is kept flat and deformed, and the joint between the connecting rod 5 and the telecentric end support rod 6 is prevented from protruding against the blood vessel wall 10, Therefore, the filter is more stable and reliable in the blood vessel.
  • the flexible portion of the present embodiment may be disposed at any position of the intermediate portion of the telecentric end filter rod 31 except for the end portion, and the flexible portion may be disposed at any position of the proximal end filter rod 41.
  • the principle is the same as the above description, and therefore will not be described again.
  • the telecentric end filter rod 31 may be of a straight type as long as the bending strength at the flexible portion 8 is lower than the bending strength of the remaining portion of the telecentric end filter rod 31.
  • the filter of this embodiment is substantially the same as the filter structure of the first embodiment.
  • the flexible portion 9 in this embodiment includes a groove formed by the unloading in the intermediate portion of the telecentric end filter rod 31.
  • the intermediate region mentioned in the embodiment refers to a region other than both end portions of the telecentric end filter rod 31 and located between the both end portions.
  • the groove may be a U-shaped groove, a V-shaped groove or an arcuate groove. Taking a V-shaped groove as an example, FIG. 4a is a V-shaped groove formed by circumferentially continuous stripping of the telecentric end filter rod 31.
  • V-shaped grooves formed by cutting at different positions of the telecentric end filter rod 31, respectively.
  • the size and position of the groove can be arbitrarily set, and it is only necessary to reduce the radial cross-sectional area of the telecentric end filter rod 31.
  • the filter of this embodiment is substantially identical to the filter structure of the previous two embodiments.
  • the flexible portion 10 in this embodiment includes an opening in the telecentric end filter rod 31.
  • the opening penetrates the telecentric filter rod 31, and the opening has a diamond shape.
  • the size, shape and position of the opening The settings can be arbitrarily set, for example, the shape of the opening can be a circle, a triangle or a rectangle.
  • the filter of this embodiment is substantially the same as the filter structure of the above several embodiments.
  • the flexible portion 11 in this embodiment is at least one slit located on the telecentric end filter rod 31.
  • Figures 8a and 8b are continuous linear cuts and discontinuous linear cuts, respectively.
  • the length and position of the cut can be set arbitrarily.
  • the filter rod of the invention can maintain straight deformation after being implanted into the blood vessel, and the support rod and the connecting rod do not tilt outward to touch the inner wall of the blood vessel, thereby ensuring the filter is more stable and reliable.

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  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)

Abstract

滤器包括远心端滤网（3）、近心端滤网（4）、连接远心端滤网（3）和近心端滤网（4）的多根连接杆（5），和至少两根与连接杆（5）相连并位于连接杆（5）外侧的支撑杆。远心端滤网（3）的每根远心端滤网杆（31）的一端与一根连接杆（5）相连，所有远心端滤网杆（31）的另一端汇聚于远心端（1）形成远心端滤网（3）。远心端滤网杆（31）具有柔性部（8），当沿滤器的径向挤压所述支撑杆时，远心端滤网杆（31）在柔性部（8）处具有朝靠近滤器轴线方向的弯折变形。通过在该远心端滤网杆（31）上设有用于改变远心端滤网杆（31）局部强度的柔性部（8），能够防止连接杆（5）与支撑杆的连接处凸起而顶触血管内壁。

Description

滤器 技术领域
本发明涉及一种心血管医疗器械，尤其涉及一种过滤血栓的滤器。
背景技术
肺栓塞病死率高，其病因来源于体循环的各种栓子例如血栓脱落腔静脉滤器(以下简称滤器)在临床上被证实为预防肺栓塞安全有效的手段，可降低肺栓塞的发生率。滤器植入下腔静脉一定时间后，会不同程度地被内皮细胞爬覆、包裹，造成难于取出；滤器长期与血液和血管内皮接触，可能发生蛋白质吸附、血小板粘附，最终形成血栓导致静脉血管堵塞，或导致肺栓塞再发生；并且可能会发生滤器变形、倾斜、移位、断裂，甚至穿透血管的危险。因此，如何保证滤器在血管中的稳定性是一个亟待解决的问题。
发明内容
本发明要解决的技术问题在于，针对现有技术的缺陷，提供一种可稳定可靠地固定于血管内壁的滤器。
本技术方案是：提供一种滤器，其包括远心端滤网、近心端滤网、连接所述远心端滤网和所述近心端滤网的多根连接杆，和至少两根与所述连接杆相连并位于所述连接杆外侧的支撑杆，所述远心端滤网包括多根远心端滤网杆，每根远心端滤网杆的一端与所述连接杆相连，所有所述远心端滤网杆的另一端汇聚于远心端形成所述远心端滤网；所述远心端滤网杆具有柔性部，当沿所述滤器的径向挤压所述支撑杆时，所述远心端滤网杆在所述柔性部处具有朝靠近所述滤器轴线方向的弯折变形。
在本发明的一实施例中，所述远心端滤网杆在柔性部处的弯曲强度低于所述远心端滤网杆除柔性部外的其余区域的弯曲强度。
在本发明的一实施例中，所述远心端滤网杆包括与所述连接杆相连的第一 部分以及与所述第一部分相连并与所述第一部分形成钝角的第二部分，所述柔性部包括所述第一部分和所述第二部分的连接处。
在本发明的一实施例中，所述柔性部包括所述远心端滤网杆的中间区域通过去料形成的凹槽。
在本发明的一实施例中，所述凹槽为V形凹槽、U形凹槽或弧形凹槽。
在本发明的一实施例中，所述柔性部分包括设于所述远心端滤网杆上的开孔。
在本发明的一实施例中，所述柔性部分包括设于所述远心端滤网杆上的割痕。
在本发明的一实施例中，所述割痕为连续或非连续的线状割痕。
在本发明的一实施例中，所述支撑杆包括靠近所述远心端设置的远心端支撑杆和靠近所述近心端设置的近心端支撑杆。
在本发明的一实施例中，所述远心端支撑杆包括自所述连接杆向远离所述滤器轴线延伸的引导段以及自所述引导段朝大致平行于所述连接杆的方向延伸的支撑段。
在本发明的一实施例中，所述远心端支撑杆上还设有朝向近心端的固定锚，所述固定锚位于所述引导段与所述支撑段的连接处。
本发明的滤器的远心端滤网杆上设有柔性部，即远心端滤网杆在柔性部处相比除柔性部外的其余区域具有较小的弯曲强度，当滤器的支撑杆在血管内受径向挤压时，远心端滤网杆可在柔性部处发生朝靠近滤器轴向的方向的变形，由此使得滤器始终保持平直变形，连接杆远离血管壁，防止连接杆与支撑杆的相交处凸起而顶触血管内壁。
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是本发明一实施例提供的一种滤器的立体结构示意图；
图2是本发明的滤器第一实施例中远心端滤网杆的结构示意图；
图3是本发明的滤器第二实施例中远心端滤网杆的结构示意图；
图4a、4b和4c分别是图3中标号为9的部位的放大图；
图5是本发明的滤器第三实施例中远心端滤网杆的结构示意图；
图6是图5中标号为10的部位的放大图；
图7是本发明的滤器第四实施例中远心端滤网杆的结构示意图；
图8a和图8b分别是图7中标号为11的部位的放大图；
图9是本发明的滤器经植入后在血管内的形变示意图；
图10是无削弱结构的滤器经植入后在血管内的形变示意图。
具体实施方式
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。
本发明总的技术构思为在远心端滤网杆除两端部外的任何位置设置柔性部来降低该部分的弯曲强度，使得该部分的弯曲强度低于除柔性部外的其他部分的弯曲强度。这样当支撑杆受到来自沿滤器径向方向的压力时，该柔性部能够即时发生朝向滤器轴线方向的弯折变形，从而使得支撑杆的一部分始终保持平直变形，避免支撑杆与滤网杆相连的部分因压力而翘起刺破血管壁。
柔性部可以是在远心端滤网杆除两端之外的任何位置设置的弯曲强度较低的部分，例如可以通过采用较柔软的材料来构造该柔性部，也可以是在远心端滤网杆的中间区域(即两端部之间的区域)通过弯折滤网杆、去料、开孔来构造该柔性部。下面就通过几个具体的实施例来对本发明的技术构思做详细的说明：
第一实施例：
如图1和图2所示，一种滤器包括远心端1、近心端2以及连接于远心端1和近心端2之间的滤器主体。远心端1设有连接螺母11和回收钩12。连接螺母11用于与输送钢缆连接。远心端1和近心端2上均设有连接螺母11。回收钩12可与抓捕装置配合，将滤器从下腔静脉中取出，避免长期植入带来的生物学风险。回收钩12可以有多个，间隔分布在远心端1的外周面上且从远心端1沿远离远心端1的方向向外辐射延伸并从远心端1指向滤器主体。此外， 还可以在近心端2设置回收钩，使得滤器可从两个方向回收。
滤器主体包括远心端滤网3、近心端滤网4以及用于连接远心端滤网3和近心端滤网4的连接杆5。连接杆5有多个，多个连接杆5环绕远心端1和近心端2之间的连线周向间隔设置。远心端滤网3包括多个自连接杆一端向远心端1延伸并汇聚在远心端1的远心端滤网杆31。近心端滤网4包括多个自连接杆另一端向近心端2延伸并汇聚近心端2的Y形近心端滤网杆41。任意一个Y形近心端滤网衦41包括第一网线411以及自第一网线411一端分叉延伸的两条第二网线412，两条第二网线412的端部分别与相邻的两根连接杆5相连。多条第一网线411汇集在近心端2使得近心端滤网4整体呈锥形网状结构。在本发明中，远心端滤网3和近心端滤网4的结构互不相同。
该滤器还进一步包括与连接杆5连接的支撑杆，支撑杆用于与血管内壁抵触从而使连接杆5远离血管内壁而不接触血管内壁。支撑杆能够保证整个滤器在轴向和周向受力均衡，确保整个滤器不会在血流及外力的影响下倾斜或移位。支撑杆包括靠近远心端1设置的远心端支撑杆6和靠近近心端2设置的近心端支撑杆7。该滤器两端封闭，每根连接杆5的远心端和近心端上均设置有一个与血管壁接触的支撑杆，保证了整个滤器在周向和轴向均受力平衡，解决了开放式框架结构造成的滤器整体受力不平衡现象，确保滤器不会在血流及外力的影响下倾斜、移位。
其中，远心端支撑杆6包括自连接杆5向远离滤器轴向方向延伸的引导段61、自引导段61朝大致平行于连接杆5的方向延伸的支承段62以及自引导段61和支承段62的连接处朝近心端2延伸的固定锚63。近心端支撑杆7的结构与远心端支撑杆6的结构大体相同，只是没有固定锚63。在本发明其他实施例中，近心端支撑杆7的结构可与远心端支撑杆6的结构相同。
如图2所示，远心端滤网杆31包括与连接杆5相连的第一部分311、与第一部分311相连并与第一部分311形成钝角a的第二部分312，和柔性部8。柔性部8设在第一部分311和第二部分312的连接处。该柔性部8能够改变远心端滤网杆31的局部弯曲强度，即柔性部8相对远心端网杆31除柔性部8外的其余区域具有较小的弯曲强度。当远心端支撑杆6受到来自于滤器径向方 向的挤压时，远心端滤网杆31在该柔性部8具有朝靠近滤器轴线方向的弯折变形。当远心端滤网杆31具有朝向靠近滤器轴线方向的弯折变形时，远心端支撑杆6的支承段62在血管内能够始终保持平直变形，从而防止连接杆5与远心端支撑杆6的连接处凸起而顶触血管内壁。柔性部8可以通过冷加工、热处理定型或其它工艺方式来完成。
图9是本实施例中的滤器经植入后在血管内的形变示意图，对比图10，可以很明显地看出，该滤器植入血管后，在血管壁10的径向压缩力作用下，远心端滤网杆31在柔性部8处发生变形，从而使远心端支撑杆6保持平直变形，避免连接杆5与远心端支撑杆6的连接处凸起触碰血管壁10，因此滤器在血管内更加稳定可靠。
值得注意的是，本实施例的柔性部可以设置在远心端滤网杆31除了端部外的中间区域的任意位置，且在近心端滤网杆41的任意位置也可以设置该柔性部，其原理与上述描述相同，因此不再赘述。
在本发明的其他实施例中，远心端滤网杆31可以呈直线型，只要柔性部8处的弯曲强度低于远心端滤网杆31的其余区域的弯曲强度即可。
第二实施例：
如图3所示，本实施例的滤器与第一实施例中的滤器结构基本相同。不同的是，本实施例中的柔性部9包括在远心端滤网杆31的中间区域通过去料形成的凹槽。需要说明的是，本实施例中所提中间区域指的是除远心端滤网杆31两端部外并位于两端部之间的区域。该凹槽可以是U形凹槽、V形凹槽或者弧形凹槽。以V形凹槽为例，图4a为环远心端滤网杆31的周向连续去料形成的V形凹槽。图4b和图4c分别为在远心端滤网杆31的不同位置去料形成的V形凹槽。凹槽的大小和位置可任意设置，只需起到削弱远心端滤网杆31的径向截面积的效果即可。
第三实施例：
如图5和图6所示，本实施例的滤器与上两个实施例中的滤器结构基本相同。不同的是，本实施例中的柔性部10包括位于远心端滤网杆31上的开孔。开孔贯穿远心端滤网杆31，且开孔形状为菱形。另，开孔的大小、形状和位 置均可任意设置，例如开孔形状可以为圆形、三角形或矩形等。
第四实施例：
如图7所示，本实施例的滤器与上几个实施例中的滤器结构基本相同。不同的是，本实施例中的柔性部11为位于远心端滤网杆31上的至少一条割痕。图8a和图8b分别为连续的线状割痕和非连续的线状割痕。另，割痕的长短、位置可任意设置。
本发明的滤器在植入血管后支撑杆能够始终保持平直变形，支撑杆与连接杆相交处不会往外翘起触碰血管内壁，保证滤器更稳定可靠。

Claims (11)

  1. 一种滤器，包括远心端滤网、近心端滤网、连接所述远心端滤网和所述近心端滤网的多根连接杆，和至少两根与所述连接杆相连并位于所述连接杆外侧的支撑杆，所述远心端滤网包括多根远心端滤网杆，每根远心端滤网杆的一端与所述连接杆相连，所有所述远心端滤网杆的另一端汇聚于远心端形成所述远心端滤网；其特征在于，所述远心端滤网杆具有柔性部，当沿所述滤器的径向挤压所述支撑杆时，所述远心端滤网杆在所述柔性部处具有朝靠近所述滤器轴线方向的弯折变形。
  2. 根据权利要求1所述的滤器，其特征在于，所述远心端滤网杆在柔性部处的弯曲强度低于所述远心端滤网杆除柔性部外的其余区域的弯曲强度。
  3. 根据权利要求1所述的滤器，其特征在于，所述远心端滤网杆包括与所述连接杆相连的第一部分以及与所述第一部分相连并与所述第一部分形成钝角的第二部分，所述柔性部包括所述第一部分和所述第二部分的连接处。
  4. 根据权利要求1所述的滤器，其特征在于，所述柔性部包括所述远心端滤网杆的中间区域通过去料形成的凹槽。
  5. 根据权利要求4所述的滤器，其特征在于，所述凹槽为V形凹槽、U形凹槽或弧形凹槽。
  6. 根据权利要求1所述的滤器，其特征在于，所述柔性部分包括设于所述远心端滤网杆上的开孔。
  7. 根据权利要求1所述的滤器，其特征在于，所述柔性部分包括设于所述远心端滤网杆上的割痕。
  8. 根据权利要求7所述的滤器，其特征在于，所述割痕为连续或非连续的线状割痕。
  9. 根据权利要求1所述的滤器，其特征在于，所述支撑杆包括靠近所述远心端设置的远心端支撑杆和靠近所述近心端设置的近心端支撑杆。
  10. 根据权利要求9所述的滤器，其特征在于，所述远心端支撑杆包括自所述连接杆向远离所述滤器轴线延伸的引导段以及自所述引导段朝大致平行于所述连接杆的方向延伸的支撑段。
  11. 根据权利要求10所述的滤器，其特征在于，所述远心端支撑杆上还设有朝向近心端的固定锚，所述固定锚位于所述引导段与所述支撑段的连接处。
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