阅读说明：本技术 一种可回收滤器及滤器推送装置 (Recoverable filter and filter pusher ) 是由 顾建平 楼文胜 成正辉 邱宇晨 尹周 王端诚 于 2019-11-20 设计创作，主要内容包括：本申请公开了一种可回收滤器,包括：回收钩、多个上层支柱、多个下层支柱所述上层支柱、所述下层支柱的一端分别与所述回收钩相连,另一端分别沿所述回收钩的周向倾斜延伸,且所述上层支柱和所述下层支柱的倾斜度不同；所述上层支柱和所述下层支柱远离所述回收钩的一端分别设有用于固定于血管壁的上层刺钩、下层刺钩；所述下层支柱设有便于所述可回收滤器回收的回收结构,以使得回收时,所述下层刺钩的顶点位于所述下层支柱最高点的切面以下；所述下层支柱靠近所述下层刺钩的一侧设有凹槽,以使得所述可回收滤器展开时,所述下层刺钩可刺入血管壁。本申请还提供一种滤器输送装置。本申请提供的可回收滤器,可使得滤器能够顺利回收。(The application discloses recoverable filter includes: the device comprises a recovery hook, a plurality of upper-layer struts, a plurality of lower-layer struts, a plurality of upper-layer struts and a plurality of lower-layer struts, wherein one ends of the upper-layer struts and one ends of the lower-layer struts are respectively connected with the recovery hook, the other ends of the upper-layer struts and the lower-layer struts respectively extend in an inclined mode along the circumferential direction of the recovery hook, and the inclination angles of the upper-layer struts; one ends of the upper-layer strut and the lower-layer strut, which are far away from the recovery hook, are respectively provided with an upper-layer barbed hook and a lower-layer barbed hook which are used for being fixed on the vessel wall; the lower-layer pillar is provided with a recovery structure facilitating recovery of the recoverable filter, so that when the lower-layer pillar is recovered, the peak of the lower-layer barbed hook is positioned below a tangent plane of the peak of the lower-layer pillar; one side of the lower-layer strut, which is close to the lower-layer barbed hook, is provided with a groove, so that when the recyclable filter is unfolded, the lower-layer barbed hook can pierce the blood vessel wall. The application also provides a filter conveyor. The application provides a recoverable filter can make the filter retrieve smoothly.)

1. A recyclable filter, comprising: a recovery hook (1), a plurality of upper struts (2), a plurality of lower struts (3)

One end of each of the upper-layer strut (2) and the lower-layer strut (3) is connected with the recovery hook (1), the other end of each of the upper-layer strut and the lower-layer strut is obliquely extended along the circumferential direction of the recovery hook (1), and the inclination of the upper-layer strut (2) is different from that of the lower-layer strut (3);

one ends of the upper-layer strut (2) and the lower-layer strut (3) far away from the recovery hook (1) are respectively provided with an upper-layer barbed hook (21) and a lower-layer barbed hook (31) which are used for being fixed on the vessel wall;

the lower-layer pillar (3) is provided with a recovery structure facilitating the recovery of the recoverable filter, so that when the lower-layer pillar is recovered, the vertex of the lower-layer barbed hook (31) is positioned below the tangent plane of the highest point of the lower-layer pillar (3);

one side of the lower-layer strut (3) close to the lower-layer barbed hook (31) is provided with a groove (32), so that when the recyclable filter is unfolded, the lower-layer barbed hook (31) can pierce the blood vessel wall.

2. The recyclable filter of claim 1, wherein the recycling structure is specifically: at least part of the lower layer pillar (3) is in an arc shape protruding outwards; or the lower-layer strut (3) is formed by connecting two sections of support columns with different gradients to form a convex broken line type; or the lower layer pillar (3) is provided with a first bulge; or at least part of the lower layer pillar (3) is in an outward convex arc shape and is provided with a first bulge; or the lower layer pillar (3) is formed by connecting two sections of supporting pillars with different gradients to form a convex broken line type and is provided with a first bulge.

3. Retrievable filter according to claim 1, characterised in that the upper layer (21) and/or the lower layer (31) of barbs are provided with an upper limit stop (22), respectively a lower limit stop (33), the upper limit stop (22) and the lower limit stop (33) being adapted to limit the depth of penetration of the upper layer (21) or the lower layer (31) of barbs into the vessel wall, respectively.

4. Recoverable filter according to claim 3, characterized in that the upper limit stop (22) is embodied as a limit stop arranged inside the upper layer barbed hook (21); and/or the presence of a gas in the gas,

the lower-layer limiting part (33) is a limiting step extending along one end, far away from the lower-layer strut (3), of the lower-layer barbed hook (31).

5. Recoverable filter according to claim 1, characterized in that the upper layer of barbed hooks (21) and/or the lower layer of barbed hooks (31) are provided with a second protrusion (4), respectively, the second protrusion (4) being adapted to limit entanglement between adjacent upper layer barbed hooks (21) or lower layer barbed hooks (31).

6. Recoverable filter according to claim 1, characterized in that the lower support (3) has a diamond-shaped structure at its end near the recovery hook (1), and that the upper layer of barbed hooks (21) has a spacing from the diamond-shaped structure at its end away from the recovery hook (1) when the recoverable filter is retracted.

7. Recoverable filter according to claim 1, characterized in that the upper layer barbed hooks (21) taper from a side close to the upper layer studs (2) to a tip thickness; and/or the thickness of the lower layer barbed hook (31) is gradually reduced from one side close to the lower layer strut (3) to the tip.

8. The retrievable filter according to claim 1, characterised in that the upper layer of barbed hooks (21) is opposite to the direction in which the lower layer of barbed hooks (31) pierces the blood vessel.

9. Recoverable filter according to any of claims 1-8, characterized in that all the lower struts (3) are twisted in the same direction, such that when the recoverable filter is collapsed, all the lower struts (3) are arranged in a tube shape.

10. A filter pushing device for pushing the recyclable filter as described in claim 9, comprising a pushing sheath (5) and a pushing rod (6) disposed inside the pushing sheath (5), wherein the pushing sheath (5) is used for accommodating the recyclable filter, the pushing rod (6) is used for pushing the recyclable filter out of the pushing sheath (5), a plugging rod (61) is disposed at the front end of the pushing rod (6), and the plugging rod (61) is matched with the lower support (3) arranged in a tubular shape when being retracted, and is used for fixing the lower support (3).

Technical Field

The application relates to the technical field of medical equipment, in particular to a recyclable filter and a filter pushing device.

Background

The vena cava filter is a filter device designed for preventing pulmonary artery embolism caused by embolus falling off from the inferior vena cava system. Three types of vena cava filter commodities appear in the market, namely a permanent type, a temporary type and an optional recycling vena cava filter. Permanent vena cava filters can reduce the incidence of fatal Pulmonary Thromboembolism (PTE), but over time, increase the risk of recurrent Deep Vein Thrombosis (DVT) formation and may lead to inferior vena cava embolism and a range of complications, including filter perforation, dislodgement, migration, and filter fracture, which can pose permanent threats to the patient.

In order to solve the clinical defects of the permanent vena cava filter, the temporary vena cava filter is produced, after the product is placed, an intervention device is required to be connected with the filter and be left outside the body, urokinase thrombolysis is simultaneously used, and after the thrombolysis is completed for 6 hours generally, the filter is withdrawn through the intervention device. A representative product is Tempofilter TM II. However, the temporary vena cava filter is likely to cause infection at the puncture site, thrombus spreading along the interventional device, filter displacement, and the like, and the maximum safe residence time of the temporary vena cava filter in the body is often exceeded before the DVT is cured.

The recovery hook for recovery is added in the design, the recovery hook is not required to be connected with an interventional device after being placed in a body, the recovery hook can be permanently kept in the body according to the requirement of a patient, and the recovery hook can be safely recovered when the patient does not need a filter any more, and the product is a recoverable vena cava filter. The recyclable vena cava filter solves the threat of the permanent vena cava filter to the patient, avoids the side effect of the temporary vena cava filter and becomes a product which is more interesting to the surgeon. Various major medical device companies have also been working on recyclable vena cava filters in response to market demands. The sequentially emerging commercial recoverable vena cava filters are Gunther, Tulip, Denali, optase, Celect, all, Option, Crux, etc., and can be removed immediately once protection against PTE is no longer needed.

Various types of filters have developed varying degrees of different types of complications from the clinical use of VCFs throughout the past. The recoverable vena cava filter removal count is only 48% of the total filter input (from 11% to 100%), with lower recoverable vena cava filter removal rates being primarily related to the following factors: to facilitate recovery, the recyclable vena cava filter requires features designed as soft hooks, collapsed components, and unconstrained stents, which can lead to unwanted filter dislodgement, tilting, difficulty/failure of deployment, difficulty of recovery, inferior vena cava penetration, etc., which increase the difficulty of filter recovery and can be life threatening to the patient; by 2016, 2006 cases of adverse events were reported to the U.S. FDA including 253 cases of filter/debris detachment, 215 cases of filter/debris migration, 213 cases of deployment difficulty/failure, 154 cases of removal difficulty, 118 cases of material perforation, 95 cases of filter tilting, filter fracture, expansion failure, and some ill events of unknown cause.

Therefore, how to provide a recyclable filter to solve or avoid the above adverse reactions is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

To solve the above technical problems, a first object of the present invention is to provide a recyclable strainer; a second object of the present invention is to provide a strainer pushing device for pushing the recyclable strainer; the application provides a recoverable filter retrieves the structure through setting up, can effectively avoid lower floor's thorn hook to hang on retrieving the sheath pipe to make the filter retrieve smoothly.

The technical scheme provided by the invention is as follows:

a recyclable filter, comprising: retrieve hook, a plurality of upper strata pillar, a plurality of lower floor's pillar

One end of each of the upper-layer strut and the lower-layer strut is connected with the recovery hook, the other end of each of the upper-layer strut and the lower-layer strut extends obliquely along the circumferential direction of the recovery hook, and the inclination of the upper-layer strut and the inclination of the lower-layer strut are different;

one ends of the upper-layer strut and the lower-layer strut, which are far away from the recovery hook, are respectively provided with an upper-layer barbed hook and a lower-layer barbed hook which are used for being fixed on the vessel wall;

the lower-layer pillar is provided with a recovery structure facilitating recovery of the recoverable filter, so that when the lower-layer pillar is recovered, the peak of the lower-layer barbed hook is positioned below a tangent plane of the peak of the lower-layer pillar;

one side of the lower-layer strut, which is close to the lower-layer barbed hook, is provided with a groove, so that when the recyclable filter is unfolded, the lower-layer barbed hook can pierce the blood vessel wall.

Preferably, the recycling structure is specifically: at least part of the lower layer pillar is in an outward convex arc shape; or the lower layer of support column is connected by two sections of support columns with different gradients to form a convex broken line type; or the lower layer pillar is provided with a first bulge; or at least part of the lower layer pillar is in an outward convex arc shape and is provided with a first bulge; or the lower layer of support column is connected by two sections of support columns with different gradients to form a convex broken line type and is provided with a first bulge.

Preferably, the upper layer thorn hook and/or lower floor's thorn hook is equipped with upper locating part, lower floor's locating part respectively, upper locating part with lower floor's locating part is used for the restriction respectively the upper layer thorn hook or the degree of depth that the vascular wall was pierced to lower floor's thorn hook.

Preferably, the upper limiting part is a limiting device arranged on the inner side of the upper barbed hook; and/or the presence of a gas in the gas,

the lower-layer limiting part is a limiting step extending along one end, far away from the lower-layer support, of the lower-layer barbed hook.

Preferably, the upper layer barbed hook and/or the lower layer barbed hook are/is provided with a second protrusion for limiting entanglement between adjacent upper layer barbed hooks or lower layer barbed hooks, respectively.

Preferably, one end of the lower support column close to the recovery hook is of a diamond structure, and when the recoverable filter is collected, the top end of the upper barbed hook and the top end of the diamond structure far away from the recovery hook have a certain distance.

Preferably, the upper layer barbed hook gradually reduces in thickness from one side close to the upper layer strut to the tip; and/or the lower layer barbed hook gradually reduces in thickness from one side close to the lower layer strut to the tip.

Preferably, the upper layer barbs penetrate into the blood vessel in a direction opposite to that of the lower layer barbs.

Preferably, all of the lower struts are twisted in the same direction so that when the recyclable filter is collapsed, all of the lower struts are arranged in a tubular shape.

The utility model provides a filter pusher for the above-mentioned recoverable filter of propelling movement, including the propelling movement sheath pipe, and set up retrieve the push rod in the sheath pipe, the propelling movement sheath pipe is used for holding recoverable filter, the push rod be used for with recoverable filter follows release in the propelling movement sheath pipe, the push rod front end is equipped with the filler rod, arrange into pipy when filling up the filler rod with packing up lower floor's pillar cooperatees, is used for fixing lower floor's pillar.

The recyclable filter provided by the application consists of a recyclable hook, an upper-layer pillar and a lower-layer pillar; the upper layer of support column and the lower layer of support column are respectively provided with an upper layer of barbed hook and a lower layer of barbed hook at the ends far away from the recovery hook, and can be anchored in two directions to prevent the filter from falling off and migrating in two directions; the filter upper and lower struts (barbed hooks) are spaced apart in the axial direction by a predetermined distance, thereby preventing the filter from being inclined. As shown in fig. 1.

Can only retrieve through jugular vein to the recoverable filter of general umbrella-type, the filter thorn hook with retrieve the sheath pipe when pushing forward the direction acutangular angle, the thorn hook hangs easily at retrieving the sheath pipe mouth of pipe, causes to retrieve the problem of difficulty or recovery failure, this application provides a recoverable filter, is equipped with at lower floor's pillar and is convenient for the recovery structure of recoverable filter recovery to when making to retrieve, the summit of lower floor's thorn hook is located below the tangent plane of lower floor's pillar peak, can effectively avoid lower floor's thorn hook to hang on retrieving the sheath pipe, thereby make the filter retrieve smoothly. When the filter is unfolded, the lower-layer support column has restoring force extending towards the outer side, so that the lower-layer barbed hook is positioned at the highest point of the unfolded lower-layer support column and matched with the groove, the blood vessel wall can be smoothly punctured, and the blood vessel wall cannot be hindered by a recovery structure. The arrangement of the groove can ensure the effective depth of the lower layer barbed hook penetrating into the vessel wall, reduce the possibility of filter migration and minimize the removal amount of the groove; the depth of the barbed hook penetrating into the vessel wall can be designed, and the angle between the lower support and the vessel can be adjusted when the filter is deployed in the vessel.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic illustration of a retrievable filter according to an embodiment of the invention deployed in a blood vessel;

FIG. 2 is a schematic view of a retrieval configuration of a retrievable strainer according to an embodiment of the invention, wherein the lower leg is at least partially convexly curved and is provided with a first projection; wherein c is the highest point of the convex arc lower strut 3; c1 is a schematic line of a tangent plane where the highest point of the arc is; d is the highest point of the first bump; d1 is a schematic line of a tangent plane in which the highest point of the first protrusion is located; e is the vertex position of the lower layer barbed hook 31;

FIG. 3 is a schematic view of the retractable filter of an embodiment of the present invention retracted within the push sheath;

FIG. 4 is a partial schematic view of a retrievable strainer with only a first projection, retracted within a push sheath, according to an embodiment of the invention; wherein d2 is the highest point of the first protrusion; e is the vertex position of the lower layer barbed hook 31;

FIG. 5 is a schematic view of a portion of the embodiment of the present invention showing the lower layer of barbs positioned higher than the grooves and piercing the wall of the blood vessel when the recyclable filter is deployed;

FIG. 6 is an enlarged partial view of the embodiment of the present invention showing the lower layer of barbs positioned higher than the grooves and piercing the wall of the blood vessel when the retrievable filter is deployed; wherein f is the vessel wall;

FIG. 7 is a schematic view of an embodiment of a recoverable filter according to the present disclosure in an expanded state and a collapsed state; wherein j1 is a schematic diagram of the unfolded state; j2 is a schematic diagram of a retracted state; f is the vessel wall;

FIG. 8 is a schematic view of the lower layer barbed hook and lower layer retainer in an embodiment of the present invention in their operating positions and in isolation; wherein k1 is a schematic diagram of the working state; k2 is a single schematic; f is the vessel wall;

FIG. 9 is a schematic view of an embodiment of a recyclable strainer with a second protrusion and a lower stop;

FIG. 10 is a schematic view of how the second protrusions of the recyclable filter avoid entanglement in an embodiment of the present invention;

FIG. 11 is a schematic view of the embodiment of the present invention showing the spacing between the top of the upper layer barbed hook and the diamond configuration when the lower layer leg of the recoverable filter is in the diamond configuration at the end adjacent to the recovery hook;

FIG. 12 is a schematic view of the spacing between the top of the upper layer barbed hook and the diamond pattern in the filter expanded state, when the lower leg of the recoverable filter is diamond-shaped at the end adjacent to the recovery hook in accordance with an embodiment of the present invention;

FIG. 13 is a schematic representation of a reusable strainer lower layer barbed hook illustrating the disposition of a structure having a decreasing thickness from a side adjacent to the lower layer leg toward the pointed end of the lower layer leg in accordance with an embodiment of the present invention; wherein g1 is in a state before treatment; g2 is in a post-treatment state;

FIG. 14 is a schematic pre-and post-processing view of a structure of a recoverable filter upper layer barb according to an embodiment of the present disclosure, with the thickness of the structure decreasing from a side adjacent to the upper support post to a tip; wherein h1 is in a state before processing; h2 is post-processing state;

FIG. 15 is a partial schematic view of a recoverable filter upper layer barb according to an embodiment of the present invention having a structure with a decreasing thickness from a side adjacent the upper support toward the tip, when the filter is collapsed;

FIG. 16 is a schematic representation of the recoverable filter base before and after twisting of the struts of the filter in accordance with an embodiment of the present invention; wherein i1 is a pre-treatment state; i2 is in post-processing state;

FIG. 17 is a schematic view of an embodiment of the present invention showing a recoverable filter having a lower leg that has been twisted, collapsed into a tubular configuration, and engaged with a push rod;

FIG. 18 is a schematic view of an embodiment of the present invention in which the recoverable filter bottom leg is collapsed into a tubular configuration and loaded into a filter pusher after twisting;

reference numerals: 1-recovery hook; 2-upper struts; 21-upper layer barbed hooks; 22-upper level limiter; 3-lower struts; 31-lower layer barbed hook; 32-grooves; 33-lower level limiting member; 4-a second protrusion; 5, pushing a sheath tube; 6-a push rod; 61-packing rod.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of a plurality of or a plurality of is two or more unless specifically limited otherwise.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.

The embodiments of the present application are written in a progressive manner.

As shown in fig. 1 to 18, an embodiment of the present invention provides a recyclable filter, including: recovery hook 1, a plurality of upper struts 2, a plurality of lower struts 3

One end of each of the upper-layer strut 2 and the lower-layer strut 3 is connected with the recovery hook 1, the other end of each of the upper-layer strut 2 and the lower-layer strut 3 extends in an inclined manner along the circumferential direction of the recovery hook 1, and the inclination of the upper-layer strut 2 is different from that of the lower-layer strut 3;

one ends of the upper-layer strut 2 and the lower-layer strut 3, which are far away from the recovery hook 1, are respectively provided with an upper-layer barbed hook 21 and a lower-layer barbed hook 31 which are used for being fixed on the blood vessel wall;

the lower-layer pillar 3 is provided with a recovery structure which is convenient for the recovery of the recoverable filter, so that when the lower-layer pillar 3 is recovered, the vertex of the lower-layer barbed hook 31 is positioned below the tangent plane of the highest point of the lower-layer pillar 3;

the side of the lower struts 3 adjacent to the lower barbs 31 is provided with a groove 32 so that the lower barbs 31 can pierce the vessel wall when the recyclable filter is deployed.

The recyclable filter provided by the application consists of a recyclable hook 1, an upper-layer pillar 2 and a lower-layer pillar 3; the upper layer support column 2 and the lower layer support column 3 are respectively provided with an upper layer barbed hook 21 and a lower layer barbed hook 31 at one ends far away from the recovery hook 1, and can be anchored bidirectionally to prevent the filter from falling off and migrating bidirectionally; the filter upper and lower struts (barbed hooks) are spaced apart in the axial direction by a predetermined distance, thereby preventing the filter from being inclined. As shown in fig. 1.

To the recoverable filter of general umbrella-type can only retrieve through jugular vein, the filter thorn hook with retrieve the sheath pipe when pushing forward the direction acutely, the thorn hook hangs easily at retrieving the sheath pipe mouth of pipe, cause and retrieve the problem of difficulty or recovery failure, this application provides a recoverable filter, is equipped with at lower floor pillar 3 and is convenient for the recovery structure of recoverable filter recovery to when making to retrieve, the summit of lower floor thorn hook 31 is located below the tangent plane of lower floor pillar 3 peak, can effectively avoid lower floor thorn hook 31 to hang on retrieving the sheath pipe, thereby make the filter retrieve smoothly. When the filter is unfolded, the lower strut 3 has restoring force extending outwards, so that the lower barbed hook 31 is positioned at the highest point of the unfolded lower strut and can smoothly pierce the blood vessel wall without being hindered by a recovery structure in cooperation with the groove 32. The arrangement of the grooves can ensure the effective depth of the lower layer barbed hooks 31 penetrating into the vessel wall, reduce the possibility of filter migration and minimize the removal amount of the grooves; the depth of the barbed hook penetrating into the vessel wall can be designed, and the angle between the lower support and the vessel can be adjusted when the filter is deployed in the vessel. As shown in fig. 2-6.

Preferably, the recycling structure is specifically: the lower layer pillar 3 is at least partially in an outward convex arc shape; or the lower-layer strut 3 is formed by connecting two sections of support columns with different gradients to form a convex broken line type; or the lower-layer pillar 3 is provided with a first bulge; or at least part of the lower layer pillar 3 is in an outward convex arc shape and is provided with a first bulge; or the lower layer pillar 3 is formed by connecting two sections of support pillars with different gradients to form a convex broken line type and is provided with a first bulge.

The recovery structure can be that at least part of the position of the lower-layer pillar 3 is set into a convex arc shape, when the filter is recovered and enters the recovery sheath tube, the convex arc part supports against the inner wall of the recovery sheath tube, the lower-layer barbed hook 31 positioned at the far end is pushed to the opposite side, and the top point of the lower-layer barbed hook is positioned below the tangent plane of the highest point of the lower-layer pillar 3, so that the lower-layer barbed hook 31 is prevented from hanging the mouth of the recovery sheath tube, and the filter is recovered smoothly. Similarly, the lower-layer strut 3 is arranged to be connected by two support columns with different gradients to form a convex broken line type, or the lower-layer strut 3 is provided with a first bulge, so that when the filter enters the recovery sheath, the bent part or the first bulge props against the inner wall of the recovery sheath, the lower-layer barbed hook 31 positioned at the far end is jacked to the opposite side, and the vertex of the lower-layer barbed hook 31 is positioned below the tangent plane of the vertex of the lower-layer strut 3, so that the lower-layer barbed hook 31 is prevented from hanging the mouth of the recovery sheath, and the filter is recovered smoothly. The arc section, the bent part or the first bulge of the lower-layer pillar 3 can be flexibly arranged according to the size of the barbed hook of the filter, and can also be in an arc shape or a fold line shape and is used together with the first bulge, as shown in fig. 2 to 4.

Preferably, the upper layer of the bayonet hook 21 and/or the lower layer of the bayonet hook 31 are respectively provided with an upper limit piece 22 and a lower limit piece 33, and the upper limit piece 22 and the lower limit piece 33 are respectively used for limiting the depth of the upper layer of the bayonet hook 21 or the lower layer of the bayonet hook 31 penetrating into the blood vessel wall.

Preferably, the upper-layer limiting piece 22 is specifically a limiting piece arranged on the inner side of the upper-layer barbed hook 21; and/or the presence of a gas in the gas,

the lower limiting member 33 is specifically a limiting step extending along one end of the lower barbed hook 31 far away from the lower pillar 3.

In order to prevent the barbs of the filter from piercing the blood vessel wall and causing adjacent tissue damage, the upper limiting piece 22 is optionally added to the upper layer barb 21, and the lower limiting piece 33 is added to the lower layer barb 31 for limiting the depth of the upper layer barb 21 or the lower layer barb 31 for piercing the blood vessel wall respectively, so as to prevent the whole strut from piercing the blood vessel.

Preferably, the upper limiting member 22 is a limiting device arranged inside the upper barbed hook 21, when the filter is folded, the upper barbed hook 21 is tightly attached to the limiting device, so that the upper barbed hook 21 is prevented from influencing other parts of the filter or the work of the filter conveying device; it is more preferred that the stop is provided with a recess for receiving the upper layer barbed hook 21 when the colander is stowed. When the filter expandes, stopper and upper strata thorn hook 21 are certain contained angle, and it is fixed that upper strata thorn hook 21 pierces the vascular wall, and stopper and vascular wall contact limit the degree of depth that upper strata thorn hook 21 pierces the vascular wall simultaneously. As shown in fig. 7.

Preferably, the lower limiting member 33 is a limiting step extending along one end of the lower barbed hook 31 away from the lower strut 3, and can limit the lower barbed hook 31 from penetrating further into the blood vessel wall after penetrating into the blood vessel wall. As shown in fig. 8.

The upper limiting part 22 and the lower limiting part 33 are arranged in different structures, and can be matched with the design that the directions of the upper layer barbed hook 21 and the lower layer barbed hook 31 which are punctured into the blood vessel are opposite, so that the filter can be kept stable in blood flow and used for filtering thrombus.

Preferably, the upper layer hooks 21 and/or the lower layer hooks 31 are respectively provided with second protrusions 4, and the second protrusions 4 are used for limiting the entanglement between the adjacent upper layer hooks 21 or lower layer hooks 31.

In order to avoid the entanglement between the adjacent upper layer barbed hooks 21 or between the adjacent lower layer barbed hooks 31, the upper layer barbed hooks 21 and/or the lower layer barbed hooks 31 are respectively provided with the second protrusions 4, when the adjacent pillars are close to each other, the distance between the barbed hooks can be pulled open due to the existence of the second protrusions 4, the possibility that the two barbed hooks are hung from each other is reduced or eliminated, and therefore the filter deployment failure is avoided. Fig. 9 to 10 show schematic diagrams of the second protrusion 4 and the lower position limiting member 33 for avoiding the two hooks from hooking each other, and at this time, the lower position limiting member 33 is similar to a protrusion to avoid entanglement.

Preferably, one end of the lower support pillar 3 close to the recovery hook 1 is a diamond structure, and when the recoverable filter is collected, the top end of the upper layer barbed hook 21 is spaced from the top end of the diamond structure far away from the recovery hook 1.

In the present application, it is preferable that one end of the lower support 3 near the recovery hook 1 is formed in a diamond structure. Specifically, one end of each lower strut 3 near the recovery hook 1 is divided into two branches, and each branch is fixed with one branch of the lower strut adjacent to the two sides, so that a rhombic structure is formed. When this application still set up the recovery filter and receive, the top of upper strata thorn hook 21, with the rhombus structure is kept away from retrieve the top of hook 1, have certain interval. The double functions of the outward expansion force and the ascending force are provided during the process of unfolding the upper struts 2 during the process of releasing and unfolding the filter, so that the failure of filter deployment caused by the fact that the upper struts 2 are clamped by a diamond structure can be avoided. As shown in fig. 11-12.

Preferably, the upper layer barbed hook 21 gradually decreases in thickness from a side close to the upper layer pillar 2 toward the tip; and/or the lower layer barbed hook 31 gradually reduces in thickness from one side close to the lower layer strut 3 to the tip.

The recoverable filter is fixed in the blood vessel mainly in two ways, one is to avoid the filter from falling off and migrating by radial supporting force and friction force with the blood vessel wall, such as a lantern filter represented by OptEase. The advantages and disadvantages of the filter are mainly: the anti-tilt performance is good, and the displacement is not easy to occur; however, the extraction time is short, generally < 2 weeks. Another is to use barbed hooks to pierce the vessel wall to prevent the filter from falling off and migrating, such as umbrella filters represented by Celect. The advantages and disadvantages of the filter are: the window period of taking out is longer, which can be more than 12 weeks; but the anti-tilting performance is not good and the displacement is easy.

The excessive radial support of the filter and the excessive contact area are considered as two key factors influencing the filter extraction window period. Thus, providing lower radial forces, point contact is used in a direction that extends the filter removal window. However, the filter with low radial force is easy to migrate, and the normal use of the filter is influenced. How to guarantee the filter of lower radial force, the thorn hook pierces the vascular wall easily to can guarantee that the thorn hook has sufficient depth of penetration and become the problem that needs to solve.

In the industry, filters are mostly formed by laser engraving of a nickel-titanium tube, the nickel-titanium tube has a certain wall thickness, and a barbed hook formed after direct cutting is not easy to pierce into a blood vessel wall. The invention processes the cut barbed hooks, so that the thickness of the upper layer barbed hooks 21 is gradually reduced from one side close to the upper layer strut 2 to the tip; and/or, lower floor thorn hook 31 is by being close to a lateral tip point thickness of lower floor's pillar 3 reduces gradually, forms sharp-pointed thorn hook front end for the thorn hook is sharper, punctures the vascular wall more easily under the condition of the same radial force, and the thorn hook of being convenient for punctures the vascular wall, guarantees the effective degree of depth and the angle that the thorn hook punctures, and fixed filter, as shown in fig. 13 to 14. The sharp front end of the barbed hook can be achieved through a grinding treatment.

In the present application, the location of the sharpening process of the barbed hook is preferably designed to be near the end of the loading tube after the filter has been loaded. Then, after the part of the material is removed to make the barbed hook sharp, a certain gap can be formed between the sharp end of the barbed hook and the loading tube, so as to prevent the sharp end of the barbed hook from scratching the loader or the delivery sheath in the process of pushing the filter, as shown in fig. 15. In addition, the thorn hook after the sharpening has the difference of thickness with between the upper limiting part 22 and the lower limiting part 33, and when the thorn hook is convenient for piercing the blood vessel wall, the piercing depth can be limited by the upper limiting part 22 and the lower limiting part 33, so that the injury of adjacent tissues caused by the whole piercing of the thorn hook out of the blood vessel wall is avoided.

Preferably, the upper layer barbs 21 penetrate into the blood vessel in the opposite direction to the lower layer barbs 31.

Furthermore, the upper layer of the barbed hooks 21 and the lower layer of the barbed hooks 31 are opposite to each other in the direction of penetrating into the blood vessel, so that the stability of filter fixation can be further improved,

preferably, all of the lower struts 3 are twisted in the same direction so that when the recyclable filter is collapsed, all of the lower struts 3 are arranged in a tubular shape.

Preferably, all the lower struts 3 are twisted in the same direction so that when the recyclable filter is collected, all the lower struts 3 are arranged in a tubular shape. The specific implementation mode can be as follows: after the lower struts 3 and the lower barbed hooks 31 are cut and formed along the circumferential direction of the nickel-titanium tube, each lower strut 3 is integrally twisted, so that the lower barbed hooks 31 rotate by a certain angle. After the lower-layer strut 3 is twisted, the length of a force arm is increased, torsion required in the twisting process is reduced, and the filter is reversely twisted into a tubular shape after the strut is formed so as to be loaded possibly. As shown in fig. 16-18.

The utility model provides a filter pusher for the above-mentioned recoverable filter of propelling movement, include propelling movement sheath pipe 5, and set up propelling movement pole 6 in the propelling movement sheath pipe 5, propelling movement sheath pipe 5 is used for holding recoverable filter, propelling movement pole 6 be used for with recoverable filter follows push out in the propelling movement sheath pipe 5, 6 front ends of propelling movement pole are equipped with and fill in pole 61, fill in pole 61 with arrange into pipy when packing up lower floor's pillar 3 cooperatees, is used for fixing lower floor's pillar 3.

The application still provides the filter pusher of the above-mentioned recoverable filter of cooperation propelling movement, especially propelling movement lower floor pillar 3 twists reverse to same direction, so that when recoverable filter was packed up, all tubular recoverable filter is arranged into to lower floor pillar 3, and filter pusher adds stopper rod 61 at push rod 6 front end, can effectively avoid in the filter transportation or the propelling movement in-process, and lower floor thorn hook 31 and lower floor pillar 3 take place in disorder to avoid deploying the emergence of difficulty or failure. As shown in fig. 16-18. Since the plug rod 61 is removed before the filter is used, and the plug rod 61 is removed, the filter can be pushed by the push rod 6 conveniently, and therefore, the directions of the push rod 6 and the plug rod 61 entering the filter can be opposite.

The application provides a recoverable filter also can use propelling movement sheath pipe 5 (denominated as the recovery sheath pipe this moment) during the recovery, and the cooperation is retrieved the pole and is caught recovery hook 1, breaks away from the filter from the vascular wall, during the sheath pipe was retrieved in the income, realized the recovery of filter.