Vena cava filter and filter retrieval system

Abstract

The application relates to a vena cava filter and a filter recovery system. The vena cava filter comprises a filter component for intercepting thrombus and a recovery component comprising a recovery seat, a recovery hook and a rotating assembly. The recovery seat is arranged at the proximal end of the filter component. The rotating assembly is connected to the end of the recovery hook and movably arranged in the recovery seat. The recovery hook is rotated relative to the recovery seat through the rotating assembly to adjust the position and / or orientation of the recovery hook relative to the filter component. The movable installation of the recovery hook into the recovery seat through the rotating assembly can realize the position and / or orientation adjustment of the recovery hook during hooking, facilitates the hooking recovery of the recovery hook from different angles, increases the adjustable performance of the recovery hook, adjusts the azimuth angle of the recovery hook, adjusts the recovery hook to a position far away from the blood vessel, reduces the recovery difficulty and facilitates the recovery operation.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a vena cava filter and a filter recovery system. Background Technology

[0002] Deep venous thrombosis (DVT) is a disease that obstructs venous return due to abnormal blood clotting in deep veins, commonly occurring in the lower extremities. A detached thrombus can cause pulmonary embolism (PE). DVT and PE are collectively referred to as venous thromboembolism (VTE), representing different stages of the same disease. PE clinically presents with sudden chest pain, chest tightness, dyspnea, and cyanosis; severe cases can lead to shock. It is difficult to detect early clinically, has a rapid onset, and is a disease with a high mortality rate.

[0003] Inferior vena cava filters (IVCFs) are devices designed to prevent pulmonary embolism (PE) caused by the dislodgement of emboli from deep vein thrombosis (DVT) in the inferior vena cava system. Studies have confirmed that filter implantation can effectively reduce the incidence of PE. Currently, IVCFs are mainly divided into two categories: permanent filters and non-permanent filters.

[0004] Non-permanent filters mainly include retrievable filters and temporary filters. Structurally, retrievable filters are mostly umbrella-shaped, designed with barbs to fix them to the wall of the inferior vena cava, and also have a retrieval hook at the top for removal using a catcher. After being released into the blood vessel, they form a cone shape, and since they make point contact with the vessel wall, they cause less stimulation to the vessel. However, during release, they are prone to tilting due to the vessel's structure. Once tilted, the retrieval hook tends to get close to the vessel wall, making it difficult to catch and retrieve, leading to retrieval failure. In other words, the filter is prone to tilting when implanted in the inferior vena cava, which is not conducive to subsequent retrieval. Summary of the Invention

[0005] Therefore, it is necessary to provide a vena cava filter and filter retrieval system to address the problem that the current filter is prone to tilting during implantation, which makes retrieval difficult. The system can adjust the position and orientation of the retrieval hook so that the retrieval hook is away from the inner wall of the blood vessel, making it easier for the filter retrieval kit to grab the retrieval hook, reducing the difficulty of retrieval and facilitating the retrieval operation.

[0006] A vena cava filter, comprising:

[0007] Filter components are used to intercept blood clots;

[0008] The recycling component includes a recycling seat, a recycling hook, and a rotating assembly. The recycling seat is disposed near the end of the filter component. The rotating assembly is connected to the end of the recycling hook and is movably disposed on the recycling seat. The recycling hook is rotated relative to the recycling seat by the rotating assembly to adjust the position and / or orientation of the recycling hook relative to the filter component.

[0009] In one embodiment of this application, the recycling seat has an installation space and a limiting end, the limiting end being located at the proximal end of the recycling seat, the rotating component being movably disposed in the installation space, and the limiting end being used to restrict the rotating component from detaching from the installation space.

[0010] In one embodiment of this application, the rotating assembly includes a first connector and a rotating member. The rotating member is movably disposed on the recycling seat. One end of the first connector is connected to the rotating member, and the other end is connected to the end of the recycling hook.

[0011] In one embodiment of this application, the rotating assembly includes a support rod, a rotating member, and a second connecting member. The support rod is disposed on the retrieval seat, the rotating member is rotatably disposed on the support rod and can move relative to the support rod, the rotating member is connected to the second connecting member, and the second connecting member is connected to the end of the retrieval hook.

[0012] In one embodiment of this application, the rotating member has a through hole, the support rod is located in the through hole, and the rotating member moves relative to the support rod through the through hole.

[0013] In one embodiment of this application, the recycling hook includes a base and a hook portion, the base being connected to the end of the hook portion, and the base being used to limit the position of the hook portion moving toward the recycling base;

[0014] The number of hooks is multiple, and the multiple hooks are evenly distributed in the circumferential direction of the seat.

[0015] In one embodiment of this application, the filtering component includes a first filter and a second filter for filtering out thrombi. The first filter has an open structure at its distal end, the proximal end of the first filter is connected to the distal end of the second filter, and the proximal end of the second filter is connected to the distal end of the recovery component.

[0016] In one embodiment of this application, the first filter includes a plurality of first filter rods, all of which are interconnected at their proximal ends to the distal end of the second filter, and the first filter rods extend from the proximal end to the distal end and expand outward.

[0017] In one embodiment of this application, the first filter further includes a plurality of first limiting hooks, each of the first filter rods having at least one first limiting hook on its outer side, the end of the first limiting hook away from the first filter rod being wedge-shaped and inclined toward the proximal end;

[0018] The angle between the first limiting hook and the tangential surface of the first filter rod is 30°~60°.

[0019] In one embodiment of this application, the minimum distance between the first limiting hook at the distal end of the first filter rod and the distal end of the first filter rod is 2mm to 3mm.

[0020] In one embodiment of this application, the second filter includes a first filter screen and a second filter screen. The first filter screen has an open structure at its proximal end, and the second filter screen has an open structure at its distal end. The proximal end of the second filter screen is connected to the distal end of the recycling seat, and the distal end of the first filter screen is connected to the proximal end of the first filter.

[0021] The first filter screen and the second filter screen are connected to form a basket structure, or the first filter screen and the second filter screen have a gap at the opening, and the first filter screen and the second filter screen are connected by rods.

[0022] In one embodiment of this application, the second filter further includes a plurality of second filter rods, the plurality of second filter rods being interconnected at their distal ends to the proximal end of the first filter, the plurality of second filter rods being interconnected at their proximal ends to the distal end of the recycling seat, and the central region of the second filter rods expanding outward.

[0023] In one embodiment of this application, the second filter further includes a plurality of second limiting hooks. In the second filter screen, each second filter rod has at least one second limiting hook on its outer side. The end of the second limiting hook away from the second filter rod is wedge-shaped and inclined toward the distal end.

[0024] The angle between the second limiting hook and the tangential surface of the second filter rod is in the range of 30° to 60°.

[0025] A filter retrieval system includes a filter retrieval kit and a vena cava filter as described in any of the above technical features, wherein the filter retrieval kit engages a retrieval hook on the vena cava filter to adjust the position and / or orientation of the retrieval hook.

[0026] By adopting the above embodiments, this application has at least the following technical effects:

[0027] In the vena cava filter and filter retrieval system of this application, the filter element is disposed at the proximal end of the retrieval element, and the retrieval element is disposed at the distal end. The filter element intercepts thrombi. The retrieval seat of the retrieval element is disposed at the proximal end of the filter element, and a rotating assembly is rotatably disposed on the retrieval seat. The rotating assembly is connected to the end of the retrieval hook. When the retrieval hook moves, it can rotate relative to the retrieval seat via the rotating assembly, thereby adjusting the position and / or orientation of the retrieval hook relative to the retrieval seat.

[0028] This vena cava filter features a rotating assembly that allows the retrieval hook to be movably mounted onto the retrieval seat. This enables adjustment of the hook's position and / or orientation during retrieval, facilitating retrieval from different angles and increasing the hook's adjustability. When the filter retrieval kit retrievals the hook body, the hook can be pulled out of the retrieval seat, and its orientation can be adjusted according to usage requirements, placing it in a suitable retrieval position. This allows for adjustment of the hook's orientation and angle, enabling it to be positioned away from the blood vessel, reducing retrieval difficulty and simplifying the retrieval process. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a vena cava filter according to an embodiment of this application.

[0030] Figure 2 for Figure 1 The diagram shows an unadjusted vena cava filter within the blood vessel.

[0031] Figure 3 for Figure 1 The diagram shows the vena cava filter after adjustment within the blood vessel.

[0032] Figure 4 for Figure 1 A schematic diagram of the recovery component in the vena cava filter is shown.

[0033] Figure 5 for Figure 4 The cross-sectional view of one embodiment of the recycling component shown at point AA.

[0034] Figure 6 for Figure 4 A cross-sectional view of another embodiment of the recycling component shown.

[0035] Figure 7 for Figure 6 The diagram shown is a 3D view of the recycling component without the recycling base.

[0036] Figure 8 for Figure 4 The diagram shows the retraction component in the pulled-out state.

[0037] Figure 9 for Figure 8 The cross-sectional view of the recycled component shown.

[0038] Figure 10 for Figure 8 The diagram shown illustrates the recovery component in an adjustment state.

[0039] Figure 11 for Figure 10 The cross-sectional view of the recycled component shown.

[0040] Figure 12 for Figure 4 A schematic diagram of one embodiment of the recycling hook in the recycling component shown.

[0041] Figure 13 for Figure 12 The top view of the recycling hook shown.

[0042] Figure 14 for Figure 4 A schematic diagram of another embodiment of the recycling hook in the recycling component shown.

[0043] Figure 15 for Figure 14 The top view of the recycling hook shown.

[0044] Figure 16 for Figure 1 A schematic diagram of the filtering components in the vena cava filter is shown.

[0045] Figure 17 for Figure 16 The bottom view of the filter component shown.

[0046] Figure 18 for Figure 16 A partial enlarged view of the first filter in the filter assembly shown.

[0047] Figure 19 for Figure 16 A schematic diagram of another embodiment of the filter element shown.

[0048] Figure 20 for Figure 16 A partial enlarged view of the second filter in the filter assembly shown.

[0049] Wherein: 10, vena cava filter; 100, filter component; 110, first filter; 111, first filter rod; 112, first limiting hook; 120, second filter; 121, first filter screen; 122, second filter screen; 123, second filter rod; 124, second limiting hook; 200, retrieval component; 210, retrieval seat; 211, installation space; 212, limiting end; 220, rotating assembly; 221, rotating component; 222, first connecting component; 223, support rod; 224, rotating component; 225, second connecting component; 226, through hole; 230, retrieval hook; 231, seat body; 232, hook part; 50, blood vessel. Detailed Implementation

[0050] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0051] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0052] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0056] See Figures 1 to 3 This application provides a vena cava filter 10. The vena cava filter 10 is used in a filter retrieval system and includes a filtering component 100 and a retrieval component 200. The filtering component 100 intercepts thrombi in the vena cava, preventing thrombus detachment and pulmonary embolism. After the vena cava filter 10 intercepts the thrombus, a filter capture kit in the filter retrieval system can capture the retrieval component 200, thus retrieving the vena cava filter 10. The following description only uses the example of the vena cava filter 10 being located in a blood vessel 50. Figure 1 This is a schematic diagram of a vena cava filter 10 according to an embodiment of this application. Figure 2 for Figure 1 The diagram shown illustrates the vena cava filter 10 without adjustment within the vessel 50. Figure 3 for Figure 1 The diagram shows the vena cava filter 10 after adjustment in the blood vessel 50.

[0057] Understandably, in some applications, recyclable filters often have an umbrella-shaped structure, designed with barbs to fix them to the wall of the vena cava, and a retrieval hook at the top for easy removal by a catcher. However, when released, the recyclable filter is prone to tilting due to the vascular structure. Once tilted, the retrieval hook tends to approach the vessel wall, making it difficult to catch and retrieve, which is detrimental to subsequent filter retrieval. Therefore, this application provides a novel vena cava filter 10 that allows adjustment of the position and orientation of the retrieval hook 230, keeping it away from the inner wall of the vessel 50. This facilitates the filter retrieval kit in attaching the retrieval hook 230, reducing retrieval difficulty and simplifying the retrieval operation. The specific structure of a vena cava filter 10 according to one embodiment is described below.

[0058] See Figures 1 to 7 In one embodiment, the vena cava filter 10 includes a filtering component 100 and a retrieval component 200. The retrieval component 200 includes a retrieval seat 210, a retrieval hook 230, and a rotating assembly 220. The filtering component 100 is used to intercept thrombi. The retrieval seat 210 is disposed at the proximal end of the filtering component 100. The rotating assembly 220 is connected to the end of the retrieval hook 230 and is movably disposed on the retrieval seat 210. The retrieval hook 230 is rotated relative to the retrieval seat 210 by the rotating assembly 220 to adjust the position and / or orientation of the retrieval hook 230 relative to the filtering component 100. Figure 4 for Figure 1 A schematic diagram of the recovery component 200 in the vena cava filter 10 is shown. Figure 5 for Figure 4 The cross-sectional view of one embodiment of the recycling component 200 shown is shown. Figure 6 for Figure 4 A cross-sectional view of another embodiment of the recycling component 200 shown. Figure 7 for Figure 6 The diagram shown is a perspective view of the recycling component 200 without the recycling base 210.

[0059] It is worth noting that in this application, "proximal" refers to the end of the vena cava filter 10 closest to the heart, and "distal" refers to the end of the vena cava filter 10 furthest from the heart. Furthermore, in... Figure 1 In the design, the upper part is the proximal end, and the lower part is the distal end. Blood flows from the distal end to the proximal end, and the vena cava filter 10 can intercept thrombi. It is worth noting that during release, either the proximal or distal end of the vena cava filter 10 can be released first. During retrieval, the filter retrieval kit connects to the proximal end of the vena cava filter 10 to achieve retrieval. Specifically, after capturing a thrombus, the filter retrieval kit connects to the proximal end of the vena cava filter 10, moving the vena cava filter 10 proximally to achieve retrieval.

[0060] like Figure 1As shown, the retrieval component 200 is disposed at the proximal end of the filter component 100. The filter component 100 is used to intercept thrombi in the vena cava to prevent pulmonary embolism. The retrieval component 200, in conjunction with the filter retrieval kit, retrieves the vena cava filter 10. Through the cooperation of the filter component 100 and the retrieval component 200, after the filter component 100 intercepts the thrombus, the vena cava filter 10 is retrieved through the cooperation of the filter retrieval kit and the retrieval component 200.

[0061] In the retrieval component 200, the retrieval seat 210 is disposed near the proximal end of the filter component 100. The rotating component 220 is movably disposed in the retrieval seat 210, and the rotating component 220 is also connected to the end of the retrieval hook 230. The head end of the retrieval hook 230 protrudes from the retrieval seat 210 and is hook-shaped. Thus, when the filter retrieval kit engages with the retrieval hook 230, the gripping ring of the filter retrieval kit can catch the head end of the retrieval hook 230 and engage with the retrieval hook 230, preventing the retrieval hook 230 from slipping off and facilitating the retrieval of the vena cava filter 10.

[0062] The recovery hook 230 is in a first position and a second position relative to each other. When the recovery hook 230 is in the first position, as... Figure 3 As shown, at this time, the recovery hook 230 is in a suitable position for recovery, and the recovery operation can be performed directly. When the recovery hook 230 is in the second position, as... Figure 2 As shown, the retrieval hook 230 is close to the inner wall of the blood vessel 50. At this time, the position of the retrieval hook 230 is not convenient for the retrieval operation of the filter retrieval kit. Therefore, the retrieval hook 230 is moved relative to the rotating assembly 220 to move the retrieval hook 230 from the second position to the first position to facilitate the retrieval operation.

[0063] The rotating assembly 220 is movably disposed in the collection seat 210 and can move and rotate relative to the collection seat 210. The collection hook 230 rotates about the axis of the collection seat 210. The collection seat 210 has an installation space, in which the rotating assembly 220 is movably disposed. The collection hook 230 can drive the rotating assembly 220 to move within the collection seat 210, and the position of the collection hook 230 is adjusted by the movement of the rotating assembly 220 to facilitate the filter collection kit to engage the collection hook 230. The rotating assembly 220 can rotate within the collection seat 210, thereby allowing the collection hook 230 to rotate and change its orientation. The rotating assembly 220 can also move within the collection seat 210, thereby allowing the collection hook 230 to extend or retract within the collection seat 210.

[0064] See Figure 8 and Figure 9 When the retrieval hook 230 drives the rotating assembly 220 to move within the retrieval seat 210, the retrieval hook 230 can be pulled out of the retrieval seat 210 to change its position. See also Figure 10 and Figure 11 When the retrieval hook 230 drives the rotating assembly 220 to rotate within the retrieval seat 210, the orientation of the retrieval hook 230 can be adjusted to facilitate the retrieval of the vena cava filter 10. Adjusting the position of the retrieval hook 230 means pulling the retrieval hook 230 out of the retrieval seat 210, such as... Figure 8 and Figure 9 As shown, adjusting the orientation of the retrieval hook 230 refers to adjusting the angle between the central axis of the retrieval hook 230 and the central axis of the retrieval base 210, such as... Figure 10 and Figure 11 As shown.

[0065] Furthermore, the movement of the rotating component 220 is controlled by the recovery hook 230. During recovery when the recovery hook 230 is extremely close to the wall, after the filter recovery kit engages the recovery hook 230, operating the filter recovery kit can pull the recovery hook 230 out of the recovery seat 210 via the rotating component 220. Then, the direction of the recovery hook 230 can be adjusted as needed. After engaging the recovery hook 230, it can be pulled out completely or partially. At this time, the angle between the central axis of the recovery hook 230 and the central axis of the recovery seat 210 can be adjusted, such as... Figure 11 As shown, this facilitates retrieval. Of course, after the filter retrieval kit engages the retrieval hook 230, the vena cava filter 10 can be retrieved directly without pulling the hook 230 out of the retrieval seat 210. In difficult blood vessels, by adjusting the position and / or orientation of the retrieval hook 230, it can be positioned away from the inner wall of the blood vessel 50, reducing the difficulty of retrieving the vena cava filter 10, such as... Figure 2 and Figure 3 As shown.

[0066] In the above embodiment of the vena cava filter 10, the retrieval hook 230 is movably mounted into the retrieval seat 210 via the rotating assembly 220. This allows for adjustment of the position and / or direction of the retrieval hook 230 during retrieval, facilitating retrieval from different angles and increasing the adjustability of the retrieval hook 230. When the filter retrieval kit retrieves the retrieval hook 230, the retrieval hook 230 can be pulled out of the retrieval seat 210, and its orientation can be adjusted according to usage requirements, placing it in a suitable retrieval position. This allows for adjustment of the retrieval hook 230's orientation angle, positioning it away from the blood vessel 50, reducing retrieval difficulty and facilitating the retrieval operation.

[0067] See Figure 5 In one embodiment, the recycling seat 210 has an installation space 211 and a limiting end 212. The limiting end 212 is located at the proximal end of the recycling seat 210. The rotating component 220 is movably disposed in the installation space 211. The limiting end 212 is used to restrict the rotating component 220 from disengaging from the installation space 211. The first connector 222 extends through the installation space 211.

[0068] The retrieval base 210 is hollow, with its internal cavity extending to the proximal end of the retrieval base 210 to form an installation space 211. The rotating component 220 is movably installed in this installation space 211. The limiting end 212 is located at the proximal end of the retrieval base 210. The retrieval base 210 has a constricted structure, and the cross-sectional area at the limiting end 212 is smaller than the cross-sectional area at the installation space 211. The end of the limiting end 212 extends into the installation space 211. In this way, the limiting end 212 can limit the rotating component 220, preventing the rotating component 220 from coming out of the retrieval base 210. Moreover, the limiting end 212 allows the first connecting member 222 to extend out, so as to be linked with the retrieval hook 230.

[0069] See Figure 5 and Figure 6 In one embodiment of this application, the rotating component 220 includes a first connector 222 and a rotating component 221. The rotating component 221 is movably disposed in the mounting space 211 of the recycling seat 210. One end of the first connector 222 is connected to the rotating component 221, and the other end is connected to the end of the recycling hook 230.

[0070] The rotating component 221 is rotatably disposed within the mounting space 211 of the retrieval base 210 and can move within the mounting space 211. The proximal end of the rotating component 221 is connected to the distal end of the first connecting component 222, the proximal end of which extends out of the retrieval base 210 and is connected to the retrieval hook 230. Thus, when the retrieval hook 230 is subjected to rotational force, it can drive the rotating component 221 to rotate within the retrieval base 210, thereby adjusting the direction of the retrieval hook 230. Furthermore, when the retrieval base 210 is subjected to tension, the retrieval hook 230 can also drive the rotating component 221 to pull out of the retrieval base 210, thereby adjusting the position of the retrieval hook 230. (See [reference]). Figures 8 to 11 Optionally, the rotating member 221 is a ball joint or the like. Optionally, the first connecting member 222 is a connecting rod or a connecting pipe or the like.

[0071] See Figures 1 to 3 , Figure 6 and Figure 7 In another embodiment of this application, the rotating assembly 220 includes a support rod 223, a rotating member 224, and a second connecting member 225. The support rod 223 is disposed in the mounting space 211 of the recycling seat 210. The rotating member 224 is rotatably disposed on the support rod 223 and can move relative to the support rod 223. The rotating member 224 is connected to the second connecting member 225, which is connected to the end of the recycling hook 230.

[0072] The support rod 223 and the rotating component 224 are in a rotational and locating fit. The support rod 223 is disposed in the mounting space 211 of the retrieval seat 210, and the rotating component 224 is also located in the mounting space 211 and can be slidably disposed on the support rod 223. Moreover, the rotating component 224 can also rotate relative to the support rod 223 to output rotational motion. The proximal end of the second connecting member 225 is connected to the retrieval hook 230, and the distal end of the second connecting member 225 is connected to the rotating component 224.

[0073] When the retrieval hook 230 is subjected to tension, it drives the rotating member 224 to move relative to the support rod 223 via the second connector 225, thereby adjusting the position of the retrieval hook 230. When the retrieval hook 230 is subjected to rotational force, it can drive the rotating member 224 to rotate via the second connector 225, thereby adjusting the orientation of the retrieval hook 230. Figures 8 to 11 As shown. Thus, through the cooperation of the support rod 223 and the rotating component 224, rotational and translational motions can be output, thereby enabling the adjustment of the position and direction of the recovery hook 230.

[0074] Optionally, the support rod 223 can be directly fixed in the recycling seat 210. Of course, the rotating assembly 220 also includes a support base, with the support rod 223 disposed on the support base, which is located in the recycling seat 210, providing support. Optionally, the second connecting member 225 is a connecting rod or connecting pipe, etc. Optionally, the rotating member 224 is a universal joint structure, including a first seat, a universal joint, and a second seat. The universal joint rotatably connects the first and second seats. The first seat is slidably disposed on the support rod 223 and can rotate relative to the support rod 223. The second seat is connected to the second connecting member 225. Universal joints are prior art and will not be described in detail here. Of course, in other embodiments of this application, the rotating member 224 can also output rotational motion through a hinge.

[0075] In one embodiment, the rotating member 224 has a through hole 226, and the support rod 223 is located in the through hole 226. The rotating member 224 rotates relative to the support rod 223 through the through hole 226. Figure 6 As shown, the first seat of the rotating member 224 has a through hole 226. The support rod 223 extends into the rotating member 224 through the through hole 226. When the rotating member 224 moves, it can drive the first seat to move. In turn, when the first seat moves, it can slide and / or rotate relative to the support rod 223 through the through hole 226 to meet the adjustment requirements of the recovery hook 230.

[0076] Of course, in other embodiments of this application, the rotating component 220 may also be other structural forms that can rotate and move in the recycling seat 210, which will not be described in detail here.

[0077] See Figures 1 to 3 , Figures 12 to 15 In one embodiment, the retrieval hook 230 includes a base 231 and a hook portion 232. The base 231 is connected to the end of the hook portion 232 and is used to limit the position of the hook portion 232 moving toward the retrieval base 210. Figure 12 for Figure 4 The diagram shows an embodiment of the recycling hook 230 in the recycling component 200. Figure 13 for Figure 12 The top view of the recycling hook 230 shown. Figure 14 for Figure 4 A schematic diagram of another embodiment of the recovery hook 230 in the recovery component 200 shown. Figure 15 for Figure 14 The top view of the recycling hook 230 shown.

[0078] The base 231 serves as the base for the retrieval hook 230, and the end of the hook 232 is connected to the base 231. The hook 232 is then connected to the rotating assembly 220 via the base 231. When the rotating assembly 220 moves the retrieval hook 230 toward the retrieval seat 210, the base 231 abuts against the retrieval seat 210, thus limiting the position of the hook 232 toward the retrieval seat 210. Optionally, the base 231 and the hook 232 are an integral structure. Of course, in other embodiments of this application, the base 231 and the hook 232 can also be separately disposed and connected as a single unit by welding or other methods.

[0079] Optionally, there may be multiple hooks 232, evenly distributed circumferentially around the base 231. This allows the multiple hooks 232 to have different orientations, facilitating retrieval from different angles and increasing gripping flexibility. Optionally, the centerline of the hooks 232 passes through the center point of the retrieval component 200, such as... Figure 9 As shown. See also Figure 12 and Figure 13 There are three hooks 232, which equally divide a 360° planar circle in the distribution plane, with an included angle of 120° between adjacent hooks 232. See also Figure 14 and Figure 15 There are six hooks 232, which are evenly distributed in a 360° plane circle, with an included angle of 60° between adjacent hooks 232.

[0080] In one embodiment, the hook 232 is arc-shaped. That is, the outer surface of the hook 232 is arc-shaped, which reduces interference and facilitates gripping. Optionally, the central angle of the arc-shaped hook 232 is in the range of 180° to 270°. Within this range, the central angle of the hook 232 facilitates slippage while preventing the hook 232 from slipping off.

[0081] In one embodiment, the outer wall of the recovery hook 230 is coated with an anticoagulant coating. The anticoagulant coating serves to prevent blood clotting, ensuring normal blood flow in the vena cava. Optionally, the recovery component 200 and the filter component 100 are connected by welding.

[0082] In one embodiment, the recycling hook 230, the rotating assembly 220, and the recycling seat 210 are mechanically connected and are made of lightweight polymer material, which has high hardness, mechanical properties, and biocompatibility.

[0083] In the recovery component 200 of this application, the recovery hook 230 has its direction and position adjusted by the rotating assembly 220, facilitating retrieval from different angles. During assembly, the rotating assembly 220 is installed onto the recovery hook 230, then onto the recovery base 210, and finally the recovery base 210 is assembled from the disassembled parts. The recovery hook 230 has multiple evenly distributed hook portions 232, facilitating retrieval from different angles. The bottom of the recovery hook 230 is connected to the rotating assembly 220. After retrieval, the rotating assembly 220 can adjust the orientation of the recovery hook 230 as needed, applicable to the retrieval of the vena cava filter 10 in extreme wall-adhering situations, reducing the difficulty of retrieval.

[0084] See Figure 1 , Figure 16 and Figure 17 In one embodiment, the filtration component 100 includes a first filter 110 and a second filter 120. The first filter 110 has an open structure at its distal end, and the proximal end of the first filter 110 is connected to the distal end of the second filter 120. The proximal end of the second filter 120 is connected to the recovery component 200. Figure 16 for Figure 1 A schematic diagram of the filter element 100 in the vena cava filter 10 is shown. Figure 17 for Figure 16 The bottom view of the filter component 100 shown.

[0085] The first filter 110 is located at the distal end of the second filter 120. The first filter 110 and the second filter 120 form a double-layer filter structure, which provides good thrombus interception capability. The first filter 110 and the second filter 120 have a mesh structure, and after blood passes through the first filter 110 and the second filter 120, the first filter 110 and the second filter 120 can intercept thrombi. Optionally, the first filter 110 and the second filter 120 are made of nickel-titanium alloy. Optionally, the first filter 110 and the second filter 120 are integrally cut and formed and then heat-treated.

[0086] The first filter 110 is closed proximally and open distally, forming an open structure. That is, the first filter 110 is similar to half an ellipsoid, i.e., a semi-closed olive-shaped structure, forming a primary filter, a single-layer interception mechanism used to intercept larger thrombi. The second filter 120 is a structure closed at both ends. The proximal end of the second filter 120 connects to the recovery component 200, and the distal end of the second filter 120 connects to the proximal end of the first filter 110, forming an olive-shaped structure, a secondary filter, a double-layer interception mechanism. Furthermore, as... Figure 16 and Figure 17 As shown, a smaller filter screen is formed at the connection between the first filter 110 and the second filter 120, thereby enabling the filter element 100 to have a good thrombus capture rate and effectively prevent the occurrence of pulmonary embolism.

[0087] See Figure 1 and Figure 16 In one embodiment, the first filter 110 includes a plurality of first filter rods 111, all of which are interconnected at their proximal ends to the distal ends of the second filter 120. The first filter rods 111 extend from the proximal end to the distal end and expand outwards. The first filter rods 111 are curved, with their proximal ends connected to the second filter 120 and their distal ends extending axially away from the second filter 120 and expanding outwards from the first filter 110, forming a semi-ellipsoidal structure. Furthermore, there is a spacing between adjacent first filter rods 111. This allows the first filter 110 to form a basket structure that is closed at the proximal end and open at the distal end. When blood passes through the first filter 110, the first filter rods 111 can intercept blood clots.

[0088] See Figure 1 , Figure 16 and Figure 18 In one embodiment, the first filter 110 further includes a plurality of first limiting hooks 112, each first filter rod 111 having at least one first limiting hook 112 on its outer side, the end of the first limiting hook 112 away from the first filter rod 111 being wedge-shaped and inclined toward the proximal end. Figure 18 for Figure 16 A partially enlarged view of the first filter 110 in the filter assembly shown. (See attached image.) Figure 18 As shown, the first limiting hook 112 is inclined proximally, and the end of the first limiting hook 112 is wedge-shaped. When the vena cava filter 10 is released in the blood vessel 50, the first filter 110 abuts against the inner wall of the blood vessel 50 through the first limiting hook 112. The first limiting hook 112 can restrict the movement of the vena cava filter 10 with the blood and prevent the vena cava filter 10 from moving upward.

[0089] Optionally, the first limiting hook 112 is located on the outer surface of the widest part of the first filter rod 111. Optionally, the outer wall of each first filter rod 111 has multiple first limiting hooks 112, and the multiple first limiting hooks 112 are arranged in an array. Of course, in other embodiments of this application, the outer wall of each first filter rod 111 may also be provided with only one first limiting hook 112. That is, on the outer surface of the first filter rod 111, each row and each column can have one or more first limiting hooks 112. Optionally, when there are multiple first limiting hooks 112, the distance between each first limiting hook 112 is the same and / or different, and the distance between two adjacent first limiting hooks 112 is 1mm to 3mm.

[0090] Optionally, the first limiting hook 112 and the first filter rod 111 are an integral structure. Optionally, the first limiting hook 112 and the first filter rod 111 are shaped by integral cutting and heat treatment to ensure the structural strength of the first limiting hook 112 and the first filter rod 111. Optionally, the end of the first limiting hook 112 makes point contact with the inner wall of the blood vessel 50. Optionally, the included angle α between the tangential planes of the first limiting hook 112 and the first filter rod 111 is in the range of 30°~60°. This ensures the limiting effect of the first limiting hook 112 and prevents the vena cava filter 10 from shifting upward.

[0091] In one embodiment, the minimum distance between the first limiting hook 112 at the distal end of the first filter rod 111 and the distal end of the first filter rod 111 is 2mm to 3mm. That is, the first limiting hook 112 is not provided near the distal end of the first filter rod 111. Optionally, the distal end of the first filter rod 111 is rounded and polished to form an anti-puncture rod, avoiding excessive puncture of the blood vessel 50 by the first limiting hook 112.

[0092] See Figure 1 , Figure 16 and Figure 19 In one embodiment, the second filter 120 includes a first filter screen 121 and a second filter screen 122. The first filter screen 121 has an open structure at its proximal end, and the second filter screen 122 has an open structure at its distal end. The proximal end of the second filter screen 122 is connected to the distal end of the collection seat 210, and the distal end of the first filter screen 121 is connected to the proximal end of the first filter 110. The first filter screen 121 and the second filter screen 122 are connected to form a basket structure. Alternatively, the first filter screen 121 and the second filter screen 122 are arranged offset on the projection plane. The first filter screen 121 and the second filter screen 122 are connected by a rod, which connects the distal end of the first filter screen 121 and the proximal end of the second filter screen 122 in the second filter 120. Figure 19 for Figure 16The diagram shows another embodiment of the filter element 100. Here, the projection plane is perpendicular to the central axis of the filter element 100. Both the first filter screen 121 and the second filter screen 122 are projected onto the projection plane, but the projections of the first filter screen 121 and the second filter screen 122 do not coincide.

[0093] exist Figure 16 In this structure, the first filter 121 and the second filter 122 form an olive-shaped basket structure. When blood passes through the first filter 121 and the second filter 122, the first filter 121 and the second filter 122 can intercept blood clots. Figure 19 In this design, the first filter 121 and the second filter 122 are two semi-enclosed olive-shaped structures, staggered on the projection plane and connected by rods such as flexible rods. Both the first filter 121 and the second filter 122 are semi-ellipsoidal in shape, symmetrically arranged with their openings facing each other. The projections of the first filter 121 and the second filter 122 do not coincide. The second filter rods 123 of the first filter 121 and the second filter rods 123 of the second filter 122 are staggered in the circumferential direction of the second filter 120. The rods are located in the second filter 120, with one end connected to the proximal end of the second filter 122 and the other end connected to the distal end of the first filter 121. Of course, in other embodiments of this application, the second filter 122 may also include more semi-enclosed olive-shaped structures.

[0094] The first filter 121 and the second filter 122 form a two-stage filter, a dual-layer interception mechanism. The first filter 121 is the first layer of the dual-layer interception, and the second filter 122 is the second layer. The cooperation between the first filter 121 and the second filter allows for the interception of smaller blood clots. Figure 17 As shown, when viewed from the axial direction, a smaller filter screen is formed at the connection between the first filter 110 and the second filter 120, thereby giving the filter a good thrombus capture rate and effectively preventing the occurrence of pulmonary embolism.

[0095] In one embodiment, the second filter 120 further includes a plurality of second filter rods 123. The distal ends of the plurality of second filter rods 123 are interconnected with the proximal ends of the first filter 110, and the proximal ends of the plurality of second filter rods 123 are interconnected with the distal ends of the recovery seat 210. The centers of the second filter rods 123 expand outwards, so that the second filter 120 forms an olive shape. The second filter rods 123 are curved, with their proximal ends connected to the recovery seat 210 of the recovery component 200, and their distal ends connected to the first filter 110. The second filter rods 123 extend from the proximal end to the distal end and expand outwards in the central region of the second filter 120, forming an ellipsoidal basket structure. Thus, when blood passes through the second filter 120, the second filter rods 123 can intercept blood clots.

[0096] Optionally, the number of first filter rods 111 is equal to the number of second filter rods 123. Furthermore, the more first filter rods 111 and second filter rods 123 there are, and the smaller the rod width, the better the thrombus interception effect is guaranteed. Of course, in other embodiments of this application, the number of first filter screens 121 and the number of second filter rods 123 may also be different, both being an odd number, and may be three or more, extending radially outwards.

[0097] See Figure 1 , Figure 16 and Figure 20 In one embodiment, the second filter 120 further includes a plurality of second limiting hooks 124. In the second filter screen 122, each second filter rod 123 has at least one second limiting hook 124 on its outer side. The end of the second limiting hook 124 away from the second filter rod 123 is wedge-shaped and inclined toward the distal end. Figure 20 for Figure 16 The diagram shows a partial enlarged view of the second filter 120 in the filter element 100. The second limiting hook 124 is inclined downwards, and its end is wedge-shaped. When the vena cava filter 10 is released into the blood vessel 50, the second filter 120 abuts against the inner wall of the blood vessel 50 via the second limiting hook 124. The second limiting hook 124 restricts the downward movement of the vena cava filter 10, ensuring the accuracy of its position. Simultaneously, the second limiting hook 124 provides sufficient support to maintain the vena cava filter 10 in a centered position.

[0098] Optionally, the second limiting hook 124 is located on the outer surface of the widest part of the second filter rod 123. Optionally, the outer wall of each second filter rod 123 has multiple second limiting hooks 124, which are arranged in an array. Of course, in other embodiments of this application, the outer wall of each second filter rod 123 may also be provided with only one second limiting hook 124. That is, on the outer surface of the second filter rod 123, each row and column may have one or more second limiting hooks 124. Optionally, when there are multiple second limiting hooks 124, the distance between each second limiting hook 124 is the same and / or different, and the distance between two adjacent second limiting hooks 124 is 1mm to 3mm.

[0099] Optionally, the second limiting hook 124 and the second filter rod 123 are an integral structure. Optionally, the second limiting hook 124 and the second filter rod 123 are shaped by integral cutting and heat treatment to ensure the structural strength of the second limiting hook 124 and the second filter rod 123. Optionally, the included angle β between the tangential planes of the second limiting hook 124 and the second filter rod 123 is 30°~60°. This ensures the limiting effect of the second limiting hook 124 and prevents the vena cava filter 10 from moving proximally. Optionally, the end of the second limiting hook 124 makes point contact with the inner wall of the blood vessel 50.

[0100] The filter element 100 has a double-layer structure and excellent thrombus interception capability. The first filter 110 is a primary filter with a single-layer interception mechanism, used to intercept larger thrombi, and smaller thrombi are intercepted proximally by the first filter 121. The second filter 120 is a secondary filter with a double-layer interception mechanism. The connection between the first filter 110 and the second filter 120 shares a common cross-section, forming a smaller filter, thereby enabling the vena cava filter 10 to have a good thrombus capture rate and effectively prevent pulmonary embolism. Moreover, the cooperation of the first limiting hook 112 and the second limiting hook 124 can prevent the vena cava filter 10 from moving proximally or distally, ensuring the accurate positioning of the vena cava filter 10.

[0101] In the vena cava filter 10 of this application, the position and / or orientation of the retrieval hook 230 can be adjusted by the rotating component 220, so that the retrieval component 200 has adjustable performance, facilitating the retrieval of the vena cava filter 10 under extreme wall adhesion conditions. Furthermore, the filter component 100 adopts a double-layer structure, giving it excellent thrombus capture capability. Normally, the movement trajectory of a thrombus in the blood vessel 50 is axial, consistent with the blood flow direction. The filter component 100 can intercept various types of thrombi, thus giving the vena cava filter 10 a good thrombus capture rate and effectively preventing pulmonary embolism. Simultaneously, the filter component 100 is equipped with a first limiting hook 112 and a second limiting hook 124 to ensure the accurate positioning of the vena cava filter 10 in the blood vessel 50.

[0102] This application also provides a filter recovery system, including a filter recovery kit and a vena cava filter 10 as described in any of the above embodiments. When recovering the vena cava filter 10, the filter recovery kit engages the recovery hook 230 of the vena cava filter 10 to adjust the position and / or orientation of the recovery hook 230. The filter recovery system of this application, using the vena cava filter 10 of the above embodiments, can achieve effective recovery of the vena cava filter 10.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vena cava filter, characterized in that, include: Filter components are used to intercept blood clots; The recycling component includes a recycling seat, a recycling hook, and a rotating assembly. The recycling seat is disposed near the end of the filter component. The rotating assembly is connected to the end of the recycling hook and is movably disposed on the recycling seat. The recycling hook is rotated relative to the recycling seat by the rotating assembly to adjust the position and / or orientation of the recycling hook relative to the filter component. The recycling seat has an installation space and a limiting end. The limiting end is located near the end of the recycling seat. The rotating component is movably disposed in the installation space. The limiting end is used to restrict the rotating component from disengaging from the installation space. Adjusting the position of the recycling hook means pulling the recycling hook out of the recycling seat. Adjusting the orientation of the recycling hook means adjusting the angle between the central axis of the recycling hook and the central axis of the recycling seat.

2. The vena cava filter according to claim 1, characterized in that, The rotating assembly includes a first connector and a rotating component. The rotating component is movably disposed on the recycling seat. One end of the first connector is connected to the rotating component, and the other end is connected to the end of the recycling hook.

3. The vena cava filter according to claim 1, characterized in that, The rotating assembly includes a support rod, a rotating member, and a second connecting member. The support rod is disposed on the retrieval seat. The rotating member is rotatably disposed on the support rod and can move relative to the support rod. The rotating member is connected to the second connecting member, which is connected to the end of the retrieval hook.

4. The vena cava filter according to claim 3, characterized in that, The rotating component has a through hole, the support rod is located in the through hole, and the rotating component moves relative to the support rod through the through hole.

5. The vena cava filter according to claim 1, characterized in that, The retrieval hook includes a base and a hook portion. The base is connected to the end of the hook portion and is used to limit the position of the hook portion moving toward the retrieval base. The number of hooks is multiple, and the multiple hooks are evenly distributed in the circumferential direction of the seat.

6. The vena cava filter according to any one of claims 1 to 5, characterized in that, The filtration component includes a first filter and a second filter for filtering out thrombi. The first filter has an open structure at its distal end, and the proximal end of the first filter is connected to the distal end of the second filter. The proximal end of the second filter is connected to the distal end of the recovery component.

7. The vena cava filter according to claim 6, characterized in that, The first filter includes a plurality of first filter rods, all of which are interconnected at their proximal ends to the distal end of the second filter, and the first filter rods extend from the proximal end to the distal end and expand outward.

8. The vena cava filter according to claim 7, characterized in that, The first filter also includes a plurality of first limiting hooks, each of the first filter rods having at least one first limiting hook on its outer side, the end of the first limiting hook away from the first filter rod being wedge-shaped and inclined toward the proximal end; The angle between the first limiting hook and the tangential surface of the first filter rod is 30°~60°.

9. The vena cava filter according to claim 8, characterized in that, The minimum distance between the first limiting hook at the distal end of the first filter rod and the distal end of the first filter rod is 2mm~3mm.

10. The vena cava filter according to claim 6, characterized in that, The second filter includes a first filter screen and a second filter screen. The first filter screen has an open structure at its proximal end, and the second filter screen has an open structure at its distal end. The proximal end of the second filter screen is connected to the distal end of the recycling seat, and the distal end of the first filter screen is connected to the proximal end of the first filter. The first filter screen and the second filter screen are connected to form a basket structure, or the first filter screen and the second filter screen have a gap at the opening, and the first filter screen and the second filter screen are connected by rods.

11. The vena cava filter according to claim 10, characterized in that, The second filter also includes a plurality of second filter rods, the plurality of second filter rods being interconnected at their distal ends to the proximal end of the first filter, the plurality of second filter rods being interconnected at their proximal ends to the distal end of the recovery seat, and the central region of the second filter rods expanding outward.

12. The vena cava filter according to claim 11, characterized in that, The second filter also includes a plurality of second limiting hooks. In the second filter screen, each of the second filter rods has at least one second limiting hook on its outer side. The end of the second limiting hook away from the second filter rod is wedge-shaped and inclined toward the distal end. The angle between the second limiting hook and the tangential surface of the second filter rod is in the range of 30° to 60°.

13. A filter recovery system, characterized in that, Includes a filter retrieval kit and a vena cava filter as claimed in any one of claims 1 to 12, wherein the filter retrieval kit engages the retrieval hook of the vena cava filter to adjust the position and / or orientation of the retrieval hook.

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