Vena cava filter and filter recovery system

Abstract

The invention relates to a vena cava filter and a filter recovery system. The vein filter comprises a filtering part used for intercepting thrombus; the recycling component comprises a recycling seat, a recycling hook and a rotating assembly, the recycling seat is arranged at the near end of the filtering component, the rotating assembly is connected with the tail end of the recycling hook and movably arranged on the recycling seat, and the recycling hook rotates relative to the recycling seat through the rotating assembly so as to adjust the position and / or orientation of the recycling hook relative to the filtering component. The recovery hook is movably mounted in the recovery seat through the rotating assembly, so that the position and / or orientation of the recovery hook during sleeving can be adjusted, the recovery hook can be conveniently sleeved and recovered from different angles, the adjustable performance of the recovery hook is improved, the azimuth angle of the recovery hook is adjusted, the recovery hook can be adjusted to the position far away from the blood vessel, the recovery difficulty is reduced, and the recovery efficiency is improved. The recycling operation is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a vena cava filter and a filter recovery system. Background Art

[0002] Deep venous thromnosis (DVT) is a venous reflux disorder caused by abnormal coagulation of blood in the deep veins, which often occurs in the lower limbs. The detachment of blood clots can cause pulmonary embolism (PE). DVT and PE are collectively referred to as venous thromboembolism (VTE), which are manifestations of the same disease at different stages. The clinical manifestations of PE are sudden chest pain, chest tightness, dyspnea and cyanosis. Severe patients may experience shock. It is difficult to detect early clinically and the disease develops quickly. It is a disease with a high mortality rate.

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

[0004] Non-permanent filters mainly include retrievable filters and temporary filters. From the structural point of view, retrievable filters are mostly umbrella-shaped structures. In terms of design, there are both barb designs fixed on the wall of the vena cava and a retrieval hook on the top of the filter that can be taken out through a catcher. After being released in the blood vessel, it becomes a conical structure. At the same time, it is in point contact with the blood vessel wall, which has less stimulation to the blood vessel. However, it is easy to tilt due to the blood vessel structure when released. Once tilted, the retrieval hook is easy to approach the blood vessel wall and make it difficult to grasp the retrieval hook, resulting in retrieval failure. That is, the filter is prone to tilt when implanted in the inferior vena cava, which is not conducive to the subsequent retrieval of the filter. Summary of the invention

[0005] Based on this, it is necessary to provide a vena cava filter and a filter retrieval system to address the problem that the current filter is prone to tilt during implantation, which makes it difficult to recover. 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 take the retrieval hook, reducing the difficulty of retrieval and facilitating the retrieval operation.

[0006] A vena cava filter, comprising:

[0007] Filter components for intercepting blood clots;

[0008] The recovery component includes 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 can be movably arranged on the recovery seat. The recovery hook rotates 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.

[0009] In one embodiment of the present application, the recovery seat has an installation space and a limit end, the limit end is located at the proximal end of the recovery seat, the rotating component can be movably arranged in the installation space, and the limit end is used to limit the rotating component from escaping from the installation space.

[0010] In one embodiment of the present application, the rotating assembly includes a first connecting member and a rotating member, the rotating member is movably disposed on the recovery seat, one end of the first connecting member is connected to the rotating member, and the other end is connected to the end of the recovery hook.

[0011] In one embodiment of the present application, the rotating assembly includes a support rod, a rotating member and a second connecting member. The support rod is arranged on the recovery seat. The rotating member can be rotatably arranged 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 recovery hook.

[0012] In an embodiment of the present 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 the present application, the recovery hook includes a seat body and a hook portion, the seat body is connected to the end of the hook portion, and the seat body is used to limit the position of the hook portion moving toward the recovery seat;

[0014] There are multiple hooks, and the multiple hooks are evenly distributed in the circumferential direction of the seat body.

[0015] In one embodiment of the present application, the filtering component includes a first filter and a second filter for filtering out blood clots, the first filter is an open structure at the 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 the present application, the first filter includes a plurality of first filter rods, all of which are interconnected at the proximal end 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 the present application, the first filter further comprises a plurality of first limiting hooks, each of the first filter rods has at least one first limiting hook on its outer side, and the limiting hook is arranged in a wedge shape at the end away from the first filter rod and is 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 the present 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 2 mm to 3 mm.

[0020] In one embodiment of the present application, the second filter comprises a first filter screen and a second filter screen, the first filter screen is an open structure at the proximal end, the second filter screen is an open structure at the distal end, the proximal end of the second filter screen is connected to the distal end of the recovery 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 is connected to the second filter screen to form a basket structure, or there is a distance between the first filter screen and the second filter screen at the open part, and the first filter screen and the second filter screen are connected by a rod.

[0022] In one embodiment of the present application, the second filter also includes a plurality of second filter rods, which are mutually connected at the distal end to the proximal end of the first filter, and are mutually connected at the proximal end to the distal end of the recovery seat, and the middle area of ​​the second filter rods expands outward.

[0023] In one embodiment of the present application, the second filter further comprises a plurality of second limit hooks. In the second filter screen, each second filter rod has at least one second limit hook on its outer side. The second limit hook is arranged in a wedge shape at the end away from the second filter rod and is inclined toward the distal end.

[0024] The included 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 comprises a filter retrieval kit and a vena cava filter as described in any of the above technical features, wherein the filter retrieval kit is used to cover the retrieval hook of the vena cava filter to adjust the position and / or orientation of the retrieval hook.

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

[0027] In the vena cava filter and filter recovery system of the present application, in the vena cava filter, the filter component is arranged on the recovery component, and the filter component is located at the proximal end, and the recovery component is located at the distal end, and the thrombus is intercepted by the filter component. The recovery seat of the recovery component is arranged at the proximal end of the filter component, and the rotating component can be rotatably arranged on the recovery seat, and the rotating component is connected to the end of the recovery hook. When the recovery hook moves, the recovery hook can rotate relative to the recovery seat through the rotating component, so that the position and / or direction of the recovery hook relative to the recovery seat is adjusted to adjust the position and / or orientation of the recovery hook.

[0028] The vena cava filter can movably mount the recovery hook to the recovery seat through a rotating assembly, so that the position and / or direction of the recovery hook can be adjusted when the recovery hook is taken out, which is convenient for taking out and recovering the recovery hook from different angles, and increasing the adjustable performance of the recovery hook. When the filter recovery kit takes out the recovery hook body, the recovery hook can be pulled out of the recovery seat, and the direction of the recovery hook can be adjusted according to the use requirements, so that the recovery hook is in a position suitable for recovery. In this way, the azimuth angle of the recovery hook can be adjusted, and the recovery hook can be adjusted to a position away from the blood vessel, which reduces the difficulty of recovery and facilitates the recovery operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. 1 is a schematic diagram of a vena cava filter according to an embodiment of the present application.

[0030] Figure 2 for Figure 1 Schematic diagram of a vena cava filter shown unadjusted in a vessel.

[0031] Figure 3 for Figure 1 Schematic diagram of the vena cava filter after adjustment in a blood vessel is shown.

[0032] Figure 4 for Figure 1 Schematic diagram of the salvage components of a vena cava filter is shown.

[0033] Figure 5 for Figure 4 A cross-sectional view of one embodiment of a recovery component is shown at AA.

[0034] Figure 6 for Figure 4 A cross-sectional view of another embodiment of a recovery component is shown.

[0035] Figure 7 for Figure 6 The recovery component shown is a three-dimensional view without the recovery seat.

[0036] Figure 8 for Figure 4 A schematic diagram showing the recovery component in a pulled-out state.

[0037] Fig. 9 for Figure 8 A cross-sectional view of the recovery component is shown.

[0038] Fig.10 for Figure 8 A schematic diagram of the recovery component shown in an adjusted state.

[0039] Fig.11 for Fig.10 A cross-sectional view of the recovery component is shown.

[0040] Fig.12 for Figure 4 A schematic diagram of an embodiment of a recovery hook in a recovery component is shown.

[0041] Fig.13 for Fig.12 A top view of the retrieval hook is shown.

[0042] Fig.14 for Figure 4 A schematic diagram of another embodiment of a recovery hook in a recovery component is shown.

[0043] Fig.15 for Fig.14 A top view of the retrieval hook is shown.

[0044] Fig.16 for Figure 1 Schematic diagram of the filtering components in the vena cava filter shown.

[0045] Fig.17 for Fig.16 A bottom view of the filter element is shown.

[0046] Fig.18 for Fig.16 A partial enlarged view of the first filter in the filter component is shown.

[0047] Fig.19 for Fig.16 A schematic diagram of another embodiment of a filter element is shown.

[0048] Fig. 20 for Fig.16 A partial enlarged view of the second filter in the filter component is shown.

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

[0050] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0051] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0052] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, 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 implementation method.

[0056] See also Figures 1 to 3 The present application provides a vena cava filter 10. The vena cava filter 10 is used in a filter recovery system and includes a filter component 100 and a recovery component 200. The filter component 100 intercepts the thrombus in the vena cava to prevent the thrombus from falling off and causing pulmonary embolism. After the vena cava filter 10 intercepts the thrombus, the filter capture kit in the filter recovery system can take the recovery component 200 to achieve the recovery of the vena cava filter 10. The following text only takes the vena cava filter 10 located in the blood vessel 50 as an example for explanation. Figure 1 is a schematic diagram of a vena cava filter 10 according to an embodiment of the present application. Figure 2 for Figure 1 A schematic diagram of the vena cava filter 10 shown in an unadjusted state in a blood vessel 50, Figure 3 for Figure 1 The vena cava filter 10 is shown as a schematic diagram after being adjusted in a blood vessel 50 .

[0057] It is understandable that in some application scenarios, the recyclable filter is mostly in an umbrella-shaped structure, and the design has both a barb design fixed on the vena cava wall and a recovery hook on the top of the filter that can be taken out by a catcher. However, when the recyclable filter is released, it is easy to tilt due to the blood vessel structure. Once tilted, the recovery hook will easily approach the blood vessel wall and make it difficult to grasp the recovery hook, which is not conducive to the subsequent recovery of the filter. To this end, the present application can provide a new type of vena cava filter 10, which can adjust the position and orientation of the recovery hook 230 so that the recovery hook 230 is away from the inner wall of the blood vessel 50, which is convenient for the filter recovery kit to take the recovery hook 230, reduce the difficulty of recovery, and facilitate the recovery operation. The specific structure of the vena cava filter 10 of one embodiment is introduced below.

[0058] See also Figures 1 to 7 In one embodiment, the vena cava filter 10 includes a filter component 100 and a recovery component 200. The recovery component 200 includes a recovery seat 210, a recovery hook 230 and a rotating assembly 220. The filter component 100 is used to intercept thrombus. The recovery seat 210 is arranged at the proximal end of the filter component 100, and the rotating assembly 220 is connected to the end of the recovery hook 230 and can be movably arranged on the recovery seat 210. The recovery hook 230 rotates relative to the recovery seat 210 through the rotating assembly 220 to adjust the position and / or orientation of the recovery hook 230 relative to the filter component 100. Figure 4 for Figure 1 The schematic diagram of the recovery component 200 in the vena cava filter 10 is shown. Figure 5 for Figure 4 A cross-sectional view of an embodiment of a recovery component 200 is shown, Figure 6 for Figure 4 A cross-sectional view of another embodiment of the recovery component 200 is shown, Figure 7 for Figure 6 The recovery component 200 shown is a three-dimensional view without the recovery seat 210.

[0059] It is worth noting that the proximal end in the present application refers to the end of the vena cava filter 10 close to the heart, and the distal end refers to the end of the vena cava filter 10 away from the heart. Figure 1 In the figure, 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 the thrombus. It is worth noting that when releasing, the proximal end of the vena cava filter 10 can be released first, or the distal end of the vena cava filter 10 can be released first. When recovering, the filter recovery kit is connected to the proximal end of the vena cava filter 10 to achieve recovery. Specifically, after capturing the thrombus, the filter recovery kit is connected to the proximal end of the vena cava filter 10, driving the vena cava filter 10 to move toward the proximal end, thereby achieving the recovery of the vena cava filter 10.

[0060] like Figure 1As shown, the recovery component 200 is arranged at the proximal end of the filter component 100. The filter component 100 is used to intercept the thrombus in the vena cava to avoid causing pulmonary embolism. The recovery component 200 cooperates with the filter recovery kit to recover the vena cava filter 10. Through the cooperation of the filter component 100 and the recovery component 200, after the filter component 100 intercepts the thrombus, the vena cava filter 10 is recovered through the cooperation of the filter recovery kit and the recovery component 200.

[0061] In the recovery component 200, the recovery seat 210 is arranged at the proximal end of the filter component 100, the rotating assembly 220 is movably arranged on the recovery seat 210, and the rotating assembly 220 is also connected to the end of the recovery hook 230, and the head end of the recovery hook 230 is exposed from the recovery seat 210 and is arranged in a hook shape. In this way, when the filter recovery kit is matched with the recovery hook 230, the capture ring of the filter recovery kit can be sleeved with the head end of the recovery hook 230 and matched with the recovery hook 230 to prevent the recovery hook 230 from slipping off, thereby facilitating the recovery of the vena cava filter 10.

[0062] The first position and the second position of the retrieving hook 230 are relative. When the retrieving hook 230 is in the first position, Figure 3 As shown in FIG. 1 , at this time, the recovery hook 230 is in a suitable recovery position, and the recovery operation can be directly performed on it. When the recovery hook 230 is in the second position, as shown in FIG. 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 moves relative to the retrieval hook 230 through the rotating assembly 220, so that the retrieval hook 230 moves from the second position to the first position, which is convenient for the retrieval operation.

[0063] The rotating assembly 220 can be movably arranged on the recovery seat 210, and can move and rotate relative to the recovery seat 210. The recovery hook 230 rotates around the axis of the recovery seat 210. The recovery seat 210 has an installation space, and the rotating assembly 220 is movably arranged in the installation space. The recovery hook 230 can drive the rotating assembly 220 to move in the recovery seat 210, and the position of the recovery hook 230 is adjusted by the movement of the rotating assembly 220, so that the filter recovery kit can take the recovery hook 230. The rotating assembly 220 can rotate in the recovery seat 210, and then the recovery hook 230 can rotate to change the direction of the recovery hook 230. The rotating assembly 220 can also move in the recovery seat 210, and then the recovery hook 230 can extend or retract in the recovery seat 210.

[0064] See also Figure 8 and Fig. 9 When the recovery hook 230 drives the rotating assembly 220 to move in the recovery seat 210, the recovery hook 230 can be pulled out of the recovery seat 210 to change the position of the recovery hook 230. Fig.10 and Fig.11 When the retrieval hook 230 drives the rotating assembly 220 to rotate in the retrieval seat 210, the direction 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 Fig. 9 As shown, adjusting the direction of the recovery hook 230 means that 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 Fig.10 and Fig.11 shown.

[0065] Moreover, the movement of the rotating assembly 220 is controlled by the recovery hook 230. When the recovery hook 230 is extremely attached to the wall, after the filter recovery kit takes the recovery hook 230, the filter recovery kit can be operated to pull the recovery hook 230 out of the recovery seat 210 through the rotating assembly 220, and then the direction of the recovery hook 230 can be adjusted according to needs. After the recovery hook 230 is taken out, the recovery hook 230 can be fully or partially pulled out. At this time, the included angle between the central axis of the recovery hook 230 and the central axis of the recovery seat 210 can be adjusted, such as Fig.11 Of course, after the filter recovery kit takes out the recovery hook 230, the vena cava filter 10 can be directly recovered without pulling the recovery hook 230 out of the recovery seat 210. In a bad blood vessel, by adjusting the position and / or direction of the recovery hook 230, the recovery hook 230 can be adjusted to a position away from the inner wall of the blood vessel 50, thereby reducing the difficulty of recovering the vena cava filter 10. Figure 2 and Figure 3 shown.

[0066] The vena cava filter 10 of the above embodiment can movably install the recovery hook 230 into the recovery seat 210 through the rotating assembly 220, so that the position and / or direction of the recovery hook 230 can be adjusted when the recovery hook 230 is taken out, which is convenient for taking out and recovering the recovery hook 230 from different angles, and increasing the adjustable performance of the recovery hook 230. When the filter recovery kit takes out the recovery hook 230 body, the recovery hook 230 can be pulled out of the recovery seat 210, and the direction of the recovery hook 230 can be adjusted according to the use requirements, so that the recovery hook 230 is in a position suitable for recovery. In this way, the azimuth angle of the recovery hook 230 can be adjusted, and the recovery hook 230 can be adjusted to a position away from the blood vessel 50, which reduces the difficulty of recovery and facilitates the recovery operation.

[0067] See also Figure 5 In one embodiment, the recovery seat 210 has an installation space 211 and a limit end 212, the limit end 212 is located at the proximal end of the recovery seat 210, the rotating component 220 can be movably set in the installation space 211, the limit end 212 is used to limit the rotating component 220 from escaping from the installation space 211, and the first connecting member 222 extends through the installation space 211.

[0068] The recovery seat 210 is hollow, and its internal cavity is connected to the proximal end of the recovery seat 210 to form an installation space 211, and the rotating assembly 220 can be movably installed in the installation space 211. The limiting end 212 is located at the proximal end of the recovery seat 210, and the recovery seat 210 forms a closed structure. The cross-sectional area at the limiting end 212 is smaller than the cross-sectional area at the installation space 211, and the end of the limiting end 212 extends into the installation space 211. In this way, the limiting end 212 can limit the rotating assembly 220 to prevent the rotating assembly 220 from escaping from the recovery seat 210, and the limiting end 212 can allow the first connecting member 222 to extend so as to be linked with the recovery hook 230.

[0069] See also Figure 5 and Figure 6 In one embodiment of the present application, the rotating assembly 220 includes a first connecting member 222 and a rotating member 221. The rotating member 221 can be movably arranged in the installation space 211 of the recovery seat 210. One end of the first connecting member 222 is connected to the rotating member 221, and the other end is connected to the end of the recovery hook 230.

[0070] The rotating member 221 is rotatably disposed in the installation space 211 of the recovery seat 210 and can move in the installation space 211. The proximal end of the rotating member 221 is connected to the distal end of the first connecting member 222. The proximal end of the first connecting member 222 extends out of the recovery seat 210 and is connected to the recovery hook 230. In this way, after the recovery hook 230 is subjected to a rotational force, the recovery hook 230 can drive the rotating member 221 to rotate in the recovery seat 210 to adjust the direction of the recovery hook 230. Moreover, after the recovery seat 210 is subjected to a pulling force, the recovery hook 230 can also drive the rotating member 221 to pull out of the recovery seat 210 to adjust the position of the recovery hook 230, see 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 also Figures 1 to 3 , Figure 6 and Figure 7 In another embodiment of the present 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 arranged in the installation space 211 of the recovery seat 210. The rotating member 224 can be rotatably arranged 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, and the second connecting member 225 is connected to the end of the recovery hook 230.

[0072] The support rod 223 and the rotating member 224 are in rotational and mobile cooperation. The support rod 223 is arranged in the installation space 211 of the recovery seat 210. The rotating member 224 is also located in the installation space 211 and is slidably arranged on the support rod 223. Moreover, the rotating member 224 can also rotate relative to the support rod 223 to output a rotational motion. The proximal end of the second connecting member 225 is connected to the recovery hook 230, and the distal end of the second connecting member 225 is connected to the rotating member 224.

[0073] When the recovery hook 230 is subjected to a pulling force, the recovery hook 230 drives the rotating member 224 to move relative to the support rod 223 through the second connecting member 225, so as to adjust the position of the recovery hook 230; when the recovery hook 230 is subjected to a rotational force, the recovery hook 230 can drive the rotating member 224 to rotate through the second connecting member 225 to adjust the direction of the recovery hook 230, such as Figures 8 to 11 As shown, through the cooperation between the support rod 223 and the rotating member 224, the rotational motion and the moving motion can be output, so that the position and direction of the recovery hook 230 can be adjusted.

[0074] Optionally, the support rod 223 can be directly fixed in the recovery seat 210. Of course, the rotating assembly 220 also includes a support seat, the support rod 223 is arranged on the support seat, and the support seat is arranged in the recovery seat 210, and plays a supporting role through the support seat. Optionally, the second connecting member 225 is a connecting rod or a connecting pipe, etc. Optionally, the rotating member 224 is a universal joint structure, and the rotating member 224 includes a first seat, a universal joint and a second seat, and the universal joint can rotatably connect the first seat and the second seat, the first seat can be slidably arranged on the support rod 223, and can rotate relative to the support rod 223, and the second seat is connected to the second connecting member 225. The universal joint is a prior art and will not be repeated here. Of course, in other embodiments of the present application, the rotating member 224 can also output rotational motion in an articulated manner.

[0075] In one embodiment, the rotating member 224 has a through hole 226, the support rod 223 is located in the through hole 226, and 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 that is set through, and 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, and then 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 the present application, the rotating assembly 220 may also be other structural forms that can rotate and move in the recovery seat 210, which will not be described in detail here.

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

[0078] The seat body 231 is the base of the recovery hook 230, and the end of the hook 232 is connected to the seat body 231, and then the hook 232 is connected to the rotating assembly 220 through the seat body 231. When the recovery hook 230 is driven to move toward the recovery seat 210 by the rotating assembly 220, the seat body 231 can abut the recovery seat 210 to limit the position of the hook 232 moving toward the recovery seat 210. Optionally, the seat body 231 and the hook 232 are an integral structure. Of course, in other embodiments of the present application, the seat body 231 and the hook 232 can also be separately arranged and connected into one by welding or the like.

[0079] Optionally, there are multiple hooks 232, and the multiple hooks 232 are evenly distributed in the circumferential direction of the seat body 231. In this way, the multiple hooks 232 have different orientations, which is convenient for collecting and recovering from different angles, and increases the flexibility of grabbing. Optionally, the center line of the hook 232 passes through the center point of the recovery component 200, such as Fig. 9 See Fig.12 and Fig.13 The number of hooks 232 is three, and in the distribution plane, the three hooks 232 evenly divide a 360° plane circle, and the angle between adjacent hooks 232 is 120°. Fig.14 and Fig.15 The number of the hooks 232 is six. In the distribution plane, the six hooks 232 evenly divide a plane circle of 360°, and the angle between adjacent hooks 232 is 60°.

[0080] In one embodiment, the hook portion 232 is arranged in an arc shape. That is, the outer surface of the hook portion 232 is arranged in an arc shape, which can reduce interference and facilitate grasping. Optionally, the central angle of the arc-shaped hook portion 232 ranges from 180° to 270°. When the central angle of the hook portion 232 is within this range, it can facilitate the collection while preventing the hook portion 232 from slipping.

[0081] In one embodiment, the outer wall of the recovery hook 230 is coated with an anticoagulant coating. The anticoagulant coating can achieve the purpose of anticoagulation and ensure the normal flow of blood in the vena cava. Optionally, the recovery component 200 and the filter component 100 are connected by welding.

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

[0083] In the recovery component 200 of the present application, the recovery hook 230 adjusts the direction and position through the rotating component 220, which is convenient for collecting and recovering from different angles. When the recovery component 200 is assembled, the rotating component 220 is installed on the recovery hook 230, and then installed on the recovery seat 210, and then the recovery seat 210 is assembled and formed. The recovery hook 230 has a plurality of evenly distributed hooks 232, which is convenient for collecting and recovering from different angles. The bottom of the recovery hook 230 is connected to the rotating component 220. After the recovery hook 230 is collected, the rotating component 220 can adjust the direction of the recovery hook 230 as needed, which is applied to the recovery of the vena cava filter 10 in extreme wall adhesion conditions, reducing the difficulty of recovery.

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

[0085] The first filter 110 is located at the distal end of the second filter 120, and the first filter 110 and the second filter 120 form a double-layer filter structure, and the double-layer filter can have a good thrombus interception ability. The first filter 110 and the second filter 120 are in a mesh structure, and after the blood passes through the first filter 110 and the second filter 120, the first filter 110 and the second filter 120 can intercept the thrombus. 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 heat-treated.

[0086] The first filter 110 is closed at the proximal end and open at the distal end, forming a structure similar to an open mouth. In other words, the first filter 110 is similar to half of an ellipsoid, that is, the first filter 110 is a semi-enclosed olive-shaped structure, forming a primary filter, which is a single-layer interception mechanism for intercepting larger blood clots. The second filter 120 is a structure closed at both ends. The proximal end of the second filter 120 is connected to the recovery component 200, and the distal end of the second filter 120 is connected to the proximal end of the first filter 110, which is an olive-shaped structure, forming a secondary filter, which is a double-layer interception mechanism. Moreover, as Fig.16 and Fig.17 As shown, a smaller filter mesh is formed at the connection between the first filter 110 and the second filter 120, so that the filter component 100 has a good thrombus capture rate and effectively prevents the occurrence of pulmonary embolism.

[0087] See also Figure 1 and Fig.16 In one embodiment, the first filter 110 includes a plurality of first filter rods 111, all of which are mutually connected to the distal end of the second filter 120 at the proximal end, and the first filter rods 111 extend from the proximal end to the distal end and expand outward. The first filter rods 111 are bent, the proximal end of the first filter rods 111 is connected to the second filter 120, the distal end of the first filter rods 111 extends axially in a direction away from the second filter 120, and expands outward of the first filter 110 to form a semi-ellipsoidal structure. In addition, there is a spacing between adjacent first filter rods 111. In this way, the first filter 110 can 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 thrombi.

[0088] See also Figure 1 , Fig.16 and Fig.18 In one embodiment, the first filter 110 further includes a plurality of first limiting hooks 112, each first filter rod 111 has at least one first limiting hook 112 on its outer side, and the first limiting hook 112 is wedge-shaped at the end away from the first filter rod 111 and tilted toward the proximal end. Fig.18 for Fig.16 FIG. 1 is a partial enlarged view of the first filter 110 in the filter component shown. Fig.18 As shown, the first stop hook 112 is inclined toward the proximal end, and the end of the first stop 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 stop hook 112, and the first stop hook 112 can limit the vena cava filter 10 from moving with the blood, thereby preventing 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 a plurality of first limiting hooks 112, and the plurality of first limiting hooks 112 are arranged in an array. Of course, in other embodiments of the present application, only one first limiting hook 112 may be provided on the outer wall of each first filter rod 111. That is to say, on the outer surface of the first filter rod 111, each row and each column may be one or more first limiting hooks 112. Optionally, when the number of the first limiting hooks 112 is multiple, the distances between the first limiting hooks 112 are the same and / or different, and the distance between two adjacent first limiting hooks 112 is 1 mm to 3 mm.

[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 contacts the inner wall of the blood vessel 50 in a point contact manner. Optionally, the angle α between the tangential surface of the first limiting hook 112 and the first filter rod 111 is in the range of 30° to 60°. In this way, the limiting effect of the first limiting hook 112 can be ensured to prevent the vena cava filter 10 from moving upward.

[0091] In one embodiment, the minimum distance between the first limit hook 112 at the distal end of the first filter rod 111 and the distal end of the first filter rod 111 is 2 mm to 3 mm. In other words, the first limit 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 to prevent the first limit hook 112 from excessively puncturing the blood vessel 50.

[0092] See also Figure 1 , Fig.16 and Fig.19 In one embodiment, the second filter 120 includes a first filter 121 and a second filter 122. The first filter 121 is an open structure at the proximal end, and the second filter 122 is an open structure at the distal end. The proximal end of the second filter 122 is connected to the distal end of the recovery seat 210, and the distal end of the first filter 121 is connected to the proximal end of the first filter 110. The first filter 121 and the second filter 122 are connected to form a basket structure, or the first filter 121 and the second filter 122 are staggered on the projection surface, and the first filter 121 and the second filter 122 are connected by a rod, and the rod connects the distal end of the first filter 121 and the proximal end of the second filter 122 in the second filter 120. Fig.19 for Fig.16The schematic diagram of another embodiment of the filter component 100 is shown. The projection plane here is perpendicular to the central axis of the filter component 100, the first filter screen 121 and the second filter screen 122 are both projected on the projection plane, and the projection of the first filter screen 121 does not overlap with the projection of the second filter screen 122.

[0093] exist Fig.16 In the embodiment, the first filter 121 and the second filter 122 form an olive-shaped basket structure, and 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. Fig.19 In the embodiment of the present invention, the first filter screen 121 and the second filter screen 122 are two semi-enclosed olive shapes, staggered on the projection surface, and connected by a rod such as a flexible rod. The first filter screen 121 and the second filter screen 122 are both semi-ellipsoidal, symmetrically arranged and open to each other, the projection of the first filter screen 121 does not overlap with the projection of the second filter screen 122, and the second filter rod 123 of the first filter screen 121 and the second filter rod 123 in the second filter screen 122 are staggered in the circumferential direction of the second filter 120. The rod is located in the second filter 120, and one end thereof is connected to the proximal end of the second filter screen 122, and the other end is connected to the distal end of the first filter screen 121. Of course, in other embodiments of the present application, the second filter screen 122 may also include more semi-enclosed olive shapes.

[0094] The first filter 121 and the second filter 122 form a secondary filter, which is a double-layer interception mechanism. The first filter 121 is the first layer of the double-layer interception, and the second filter 122 is the second layer of the double-layer interception. The first filter 121 and the second filter can intercept smaller blood clots. Fig.17 As shown, when viewed from the axial direction, a smaller filter mesh is formed at the connection between the first filter 110 and the second filter 120, so that the filter has a good thrombus capture rate and effectively prevents the occurrence of pulmonary embolism.

[0095] In one embodiment, the second filter 120 further comprises a plurality of second filter rods 123, wherein the plurality of second filter rods 123 are mutually connected to the proximal end of the first filter 110 at the distal end, and the plurality of second filter rods 123 are mutually connected to the distal end of the recovery seat 210 at the proximal end, and the center of the second filter rods 123 expands outwardly so that the second filter 120 forms an olive shape. The second filter rods 123 are bent, the proximal end of the second filter rods 123 is connected to the recovery seat 210 of the recovery component 200, the distal end of the second filter rods 123 is connected to the first filter 110, the second filter rods 123 extend from the proximal end to the distal end, and expand to the outside of the second filter 120 in the middle area to form an ellipsoidal basket structure. In this way, when blood passes through the second filter 120, the second filter rods 123 can intercept thrombi.

[0096] Optionally, the number of the first filter rods 111 is equal to the number of the second filter rods 123. Moreover, the more the number of the first filter rods 111 and the second filter rods 123 is, the smaller the rod width is, and the more effective the interception of thrombus can be. Of course, in other embodiments of the present application, the number of the first filter screen 121 and the number of the second filter rods 123 can also be different, both of which can be an odd number, and can be three or more, extending radially outward.

[0097] See also Figure 1 , Fig.16 and Fig. 20 In one embodiment, the second filter 120 also 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 second limiting hook 124 is wedge-shaped at the end away from the second filter rod 123 and tilted toward the distal end. Fig. 20 for Fig.16 The second filter 120 in the filter component 100 is shown in a partially enlarged view. The second stop hook 124 is inclined downward, and the end of the second stop hook 124 is wedge-shaped. When the vena cava filter 10 is released in the blood vessel 50, the second filter 120 abuts against the inner wall of the blood vessel 50 through the second stop hook 124. The second stop hook 124 can limit the downward movement of the vena cava filter 10, ensuring the accuracy of the position of the vena cava filter 10. At the same time, the second stop hook 124 can also provide sufficient support force to keep the vena cava filter 10 in a centered shape.

[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 a plurality of second limiting hooks 124, and the plurality of second limiting hooks 124 are arranged in an array. Of course, in other embodiments of the present application, only one second limiting hook 124 may be provided on the outer wall of each second filter rod 123. That is to say, on the outer surface of the second filter rod 123, each row and each column may be one or more second limiting hooks 124. Optionally, when the number of the second limiting hooks 124 is multiple, the distances between the second limiting hooks 124 are the same and / or different, and the distance between two adjacent second limiting hooks 124 is 1 mm to 3 mm.

[0099] Optionally, the second limit hook 124 and the second filter rod 123 are an integral structure. Optionally, the second limit hook 124 and the second filter rod 123 are shaped by integral cutting and heat treatment to ensure the structural strength of the second limit hook 124 and the second filter rod 123. Optionally, the angle β between the tangential surface of the second limit hook 124 and the second filter rod 123 is 30°~60°. In this way, the limiting effect of the second limit hook 124 can be ensured to prevent the vena cava filter 10 from moving proximally. Optionally, the end of the second limit hook 124 contacts the inner wall of the blood vessel 50 in a point contact manner.

[0100] The filter component 100 is a double-layer structure with good thrombus interception ability. The first filter 110 is a primary filter screen, which is a single-layer interception mechanism, used to intercept larger thrombi and smaller thrombi intercepted by the proximal end of the first filter screen 121. The second filter 120 is a secondary filter screen, which is a double-layer interception mechanism. The connection between the first filter 110 and the second filter 120 cross-divides the cross section together to form a smaller filter screen, so that the vena cava filter 10 has a good thrombus capture rate and effectively prevents the occurrence of pulmonary embolism. Moreover, through the cooperation of the first limit hook 112 and the second limit hook 124, the vena cava filter 10 can be prevented from moving proximally and distally, ensuring that the vena cava filter 10 is accurately positioned.

[0101] In the vena cava filter 10 of the present application, the retrieval hook 230 adjusts the position and / or orientation of the retrieval hook 230 through the rotating assembly 220, so that the retrieval component 200 has an adjustable performance, which is convenient for the retrieval of the vena cava filter 10 in extreme wall-adherence conditions. Moreover, the filter component 100 adopts a double-layer structure, so that the filter component 100 has a good thrombus capture ability. Under normal circumstances, the movement trajectory of the thrombus in the blood vessel 50 is consistent with the axial direction of the blood flow. The filter component 100 can intercept various thrombi, so that the vena cava filter 10 has a good thrombus capture rate and effectively prevents the occurrence of pulmonary embolism. At the same time, the first limit hook 112 and the second limit hook 124 are set in the filter component 100, which can ensure that the position of the vena cava filter 10 in the blood vessel 50 is accurate.

[0102] The present application also provides a filter recovery system, including a filter recovery kit and a vena cava filter 10 as in any of the above embodiments. When recovering the vena cava filter 10, the filter recovery kit takes 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 the present application can achieve effective recovery of the vena cava filter 10 by using the vena cava filter 10 of the above embodiments.

[0103] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A vena cava filter, characterized in that: include: Filter components for intercepting blood clots; The recovery component includes 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 can be movably arranged on the recovery seat. The recovery hook rotates 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.

2. The vena cava filter according to claim 1, characterized in that: The recovery seat has an installation space and a limiting end, wherein the limiting end is located at the proximal end of the recovery seat, the rotating assembly can be movably arranged in the installation space, and the limiting end is used to limit the rotating assembly from escaping from the installation space.

3. The vena cava filter according to claim 1, characterized in that: The rotating assembly includes a first connecting member and a rotating member. The rotating member is movably arranged on the recovery seat. One end of the first connecting member is connected to the rotating member, and the other end is connected to the end of the recovery hook.

4. 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 arranged on the recovery seat. The rotating member can be rotatably arranged 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 recovery hook.

5. The vena cava filter according to claim 4, characterized in that: The rotating member has a through hole, the supporting rod is located in the through hole, and the rotating member moves relative to the supporting rod through the through hole.

6. The vena cava filter according to claim 1, characterized in that: The recovery hook comprises a seat body and a hook portion, wherein the seat body is connected to the end of the hook portion, and the seat body is used to limit the position where the hook portion moves toward the recovery seat; There are multiple hooks, and the multiple hooks are evenly distributed in the circumferential direction of the seat body.

7. The vena cava filter according to any one of claims 1 to 6, characterized in that: The filtering component includes a first filter and a second filter for filtering out thrombus, the first filter is an open structure at the 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.

8. The vena cava filter according to claim 7, characterized in that: The first filter comprises a plurality of first filter rods, all of which are mutually connected to the distal end of the second filter at the proximal end, and the first filter rods extend from the proximal end to the distal end and expand outward.

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

10. The vena cava filter according to claim 9, 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 2 mm to 3 mm.

11. The vena cava filter according to claim 7, characterized in that: The second filter comprises a first filter screen and a second filter screen, wherein the first filter screen is an open structure at the proximal end, and the second filter screen is an open structure at the distal end, the proximal end of the second filter screen is connected to the distal end of the recovery seat, and the distal end of the first filter screen is connected to the proximal end of the first filter; The first filter screen is connected to the second filter screen to form a basket structure, or there is a distance between the first filter screen and the second filter screen at the open part, and the first filter screen and the second filter screen are connected by a rod.

12. The vena cava filter according to claim 11, characterized in that: The second filter also includes a plurality of second filter rods, which are mutually connected to the proximal end of the first filter at the distal end, and are mutually connected to the distal end of the recovery seat at the proximal end, and the middle area of ​​the second filter rods expands outward.

13. The vena cava filter according to claim 12, characterized in that: The second filter also 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 second limiting hook is arranged in a wedge shape at the end away from the second filter rod and is inclined toward the distal end. The included angle between the second limiting hook and the tangential surface of the second filter rod is in the range of 30° to 60°.

14. A filter recovery system, characterized in that: It comprises a filter retrieval kit and the vena cava filter according to any one of claims 1 to 13, wherein the filter retrieval kit is used to sheath the retrieval hook of the vena cava filter to adjust the position and / or orientation of the retrieval hook.

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