Filter recovery assembly and filter system

Abstract

The invention discloses a filter recovery assembly and a filter system.The filter recovery assembly comprises a sheathing canal, the sheathing canal is internally provided with a channel extending in the axial direction, the end, in the axial direction, of the sheathing canal is provided with a canal opening, and the canal opening is communicated with the channel; the guide piece is accommodated in the sheath tube; the ferrule is exposed out of the pipe orifice and is connected with the guide piece, and at least part of the ferrule is movably guided into the channel under the traction of the guide piece and is deformed; the multiple ferrules are evenly distributed in the circumferential direction to form a recycling part, and the outer edge of the recycling part is a recycling ring of an annular structure. And in the process that the ferrule is introduced into the channel, the diameter of the recovery ring is gradually reduced. According to the device, all-directional and multi-angle covering is achieved in the blood vessel, the device can be matched with recycling hooks of various styles or recycling hooks of abnormal poses, and the capturing efficiency is greatly improved.

Description

Technical Field

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

[0002] Pulmonary embolism (PE) is a general term for a group of diseases or clinical syndromes that are caused by endogenous or exogenous emboli blocking the pulmonary artery and its branches, resulting in pulmonary circulation and right heart dysfunction. Deep vein thrombosis (DVT) is the main source of thrombi that cause pulmonary embolism. DVT often occurs in the veins of the lower limbs or pelvis. After detachment, it enters the pulmonary artery and its branches with the blood circulation. Pulmonary thromboembolism is often a complication of deep vein thrombosis. The vena cava filter is the preferred interventional treatment for deep vein thrombosis and pulmonary embolism. It is implanted in a position parallel to the orifice of the renal vein and can effectively prevent the occurrence of pulmonary embolism. At present, this technology has achieved good results in clinical application.

[0003] According to the time the vena cava filter remains in the body, it can be divided into permanent vena cava filters and retrievable vena cava filters. Permanent vena cava filters can reduce the occurrence of pulmonary embolism, but over time, they will cause certain irritation, endothelialization of the support rods, blockage of blood vessels, perforation, shedding, migration, breakage, and long-term medication. Retrievable vena cava filters came into being. The design adds a retrieval hook that can be used for removal, but the size and shape of the retrieval hook designed by each company are inconsistent, resulting in the filter retriever currently equipped with the retrievable vena cava filter being only suitable for vena cava filters of the same brand as the filter retriever. And when the position of the retrievable vena cava filter in the blood vessel tilts, it is difficult for the filter retriever to capture the retrieval hook, or the retrieval hook after capture is not centered and cannot be easily retrieved into the sheath. Summary of the invention

[0004] The present invention provides a filter recovery component and a filter system, which are adapted to filters of various styles, and the recovery hook is centered after capture, thereby improving the capture efficiency and avoiding secondary damage to the patient during the recovery.

[0005] In order to solve the above technical problems, the present invention discloses the following technical solutions:

[0006] In one aspect, a filter recovery assembly is provided, comprising:

[0007] A sheath tube, wherein the interior of the sheath tube has a passage extending in an axial direction, and the sheath tube has a pipe opening at one end in the axial direction, and the pipe opening is communicated with the passage;

[0008] a guide member, the guide member being accommodated in the sheath tube;

[0009] A ferrule, the ferrule is exposed from the pipe opening and connected to the guide member, and at least a portion of the ferrule can be movably introduced into the channel and deformed under the influence of the guide member;

[0010] Among them, a plurality of the ferrules are evenly distributed circumferentially to form a recovery portion, and the outer edge of the recovery portion is a recovery ring of an annular structure; during the process of introducing the ferrule into the channel, the diameter of the recovery ring gradually decreases.

[0011] In addition to or as an alternative to one or more of the features disclosed above, the recovery portion has an opening on a side facing away from the sheath tube, and the recovery portion has a recovery cavity in communication with the opening, and the radial cross-section of the recovery cavity gradually increases along the axial direction;

[0012] During the process of introducing the ferrule into the channel, the volume of the recovery cavity gradually decreases;

[0013] Wherein, the diameter of the opening is matched with the diameter of the recovery ring.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the recovery portion is an umbrella-shaped structure.

[0015] In addition to or as an alternative to one or more of the features disclosed above, the invention further comprises:

[0016] A handle, the handle being arranged at one end of the sheath away from the ferrule, the handle being connected to the guide member;

[0017] The loading device is a tubular structure, the loading device is coaxially accommodated in the sheath tube, and the guide is penetrated in the loading device.

[0018] In addition to or as an alternative to one or more of the features disclosed above, the recovery ring has a diameter of φ, wherein 2 mm ≤ φ ≤ 40 mm.

[0019] In addition to or as an alternative to one or more of the features disclosed above, the type of the ferrule includes at least one of nickel-titanium alloy wire, platinum core nickel-titanium alloy wire, titanium alloy wire, stainless steel wire, gold-plated wire, and gold-plated tungsten wire.

[0020] In addition to or as an alternative to one or more of the features disclosed above, the number of the collar is at least one.

[0021] On the other hand, a filter system is further disclosed. In addition to or as an alternative to one or more of the features disclosed above, the filter system includes a filter recovery assembly as described in any one of the above items, and the filter system also includes:

[0022] A filter, comprising:

[0023] a recovery hook, the recovery hook facing away from the axial direction;

[0024] A support portion, comprising a plurality of support rods, one end of the plurality of support rods being gathered and connected to the recovery hook, and the other end of the plurality of support rods being distributed in an umbrella shape along the axial direction;

[0025] A positioning part, comprising a plurality of positioning rods, one end of which is gathered and connected to the recovery hook, and the other end of which is distributed in an umbrella shape along the axial direction;

[0026] Among them, the positioning rod and the supporting rod are arranged alternately; when the ring is introduced into the channel, the recovery hook is hooked with any ring in the recovery part and the recovery hook is introduced into the channel.

[0027] In addition to or as an alternative to one or more of the features disclosed above, the end of the support rod away from the recovery hook is bent toward the axis direction;

[0028] The positioning rod includes a proximal positioning rod and a distal positioning rod, and the proximal positioning rod and the distal positioning rod are arranged alternately in sequence along the circumferential direction; the end of the proximal positioning rod away from the recovery hook is provided with a positioning hook bent in the radial direction; the end of the distal positioning rod away from the recovery hook is provided with a barb bent in the center direction, and a recovery slope is provided on the side of the barb away from the central axis.

[0029] In addition to one or more of the features disclosed above, or as an alternative, the circumscribed circle formed by the end of the proximal positioning rod away from the retrieval hook and the circumscribed circle formed by the end of the distal positioning rod away from the retrieval hook are of equal diameter and are in the same plane. The technical scheme in the above technical scheme has the following advantages or beneficial effects: the technical scheme forms a retrieval part by circumferentially arranging a plurality of ferrules and stacking them. The annular retrieval ring of the retrieval part can not only fit the inner wall of the blood vessel, but also completely cover the blood vessels of common diameters during the contraction process of the annular structure of the retrieval ring, causing little damage to the blood vessels. At the same time, it can grasp retrieval hooks of any structure or retrieval hooks in abnormal positions, and finally introduce the retrieval hook into the sheath in the center, which greatly improves the efficiency of capturing the retrieval hook, reduces the surgical radiation exposure time of the patient and the doctor, and avoids secondary damage to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0031] Figure 1 is a cross-sectional view of a filter recovery assembly provided according to an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of a recovery part in a filter recovery assembly provided in an embodiment of the present invention from an axial perspective;

[0033] Figure 3 is a schematic diagram of a single ferrule in a filter recovery assembly provided in an embodiment of the present invention from an axial perspective;

[0034] Figure 4 is a schematic structural diagram of a filter in a filter system provided according to an embodiment of the present invention;

[0035] Figure 5 is a schematic structural diagram of a proximal positioning rod of a filter in a filter system provided according to an embodiment of the present invention;

[0036] Figure 6 is a schematic structural diagram of a distal positioning rod of a filter in a filter system provided according to an embodiment of the present invention;

[0037] Figure 7 is a schematic diagram of a filter in a filter system provided in an axial perspective according to an embodiment of the present invention;

[0038] Figure 8 is a side view of a filter in a filter system provided according to an embodiment of the present invention;

[0039] In the figure: 110, ferrule; 120, sheath; 130, loading device; 140, handle; 111, recovery part; 1111, recovery ring; 210, recovery hook; 221, support rod; 231, positioning rod; 2311, proximal positioning rod; 2312, distal positioning rod; 2313, positioning hook; 2314, barb; 2315, recovery slope. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and beneficial effects of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present invention, not for limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] Reference Figure 1 As shown, Figure 1A cross-sectional view of a filter recovery assembly provided according to an embodiment of the present invention is shown. The filter recovery assembly provided in an embodiment of the present application includes a sheath (not shown in the figure), a guide 120, a ferrule 110, a handle 140 and a loading device 130. The sheath is a hollow tubular structure extending in the axial direction X, and has a channel extending in the axial direction X inside. Both ends of the sheath have a pipe opening for connecting the channel and the external space. The guide 120 is movably arranged in the channel in the axial direction X. The ferrule 110 is an annular structure of a flexible material, which is an annular structure in a natural state and deforms under the action of an external force. A plurality of ferrules 110 are arranged at a side pipe opening of the sheath facing the axial direction X, and all ferrules 110 are transmission-connected with the guide 120. When the guide 120 is displaced in the opposite direction of the axial direction X in the sheath, at least part of the ferrule 110 is movably introduced into the channel and elastically deformed under the pull of the guide 120. The handle 140 is disposed at the other end opening of the sheath away from the ferrule 110, and the handle 140 is in transmission connection with the guide member 120, and the user controls the movement state of the guide member 120 in the sheath channel through the handle 140. The loading device 130 is accommodated in the channel of the sheath, and has a loading space penetrating along the axial X direction inside, and the loading space is coaxially arranged with the sheath, and the guide member 120 is penetrated in the loading space of the loading device 130. The elastic ferrule 110 is accommodated in the loading device 130 in a contracted state to be installed in the sheath.

[0045] In a natural state, the ferrule 110 is arranged obliquely with respect to the axis of the sheath. A plurality of ferrules 110 are uniformly distributed in the circumferential direction with the axis of the sheath as the central axis, and adjacent ferrules 110 overlap at least partially, and a plurality of ferrules 110 are configured to form a recovery portion 111. The recovery portion 111 is an umbrella-shaped structure with an opening at one end away from the sheath, and a recovery cavity is provided inside the recovery portion 111, and the recovery cavity is used to accommodate the recovery hook 210 of the filter. The outer edge of the recovery portion 111 is a recovery ring 1111 formed by the outer edge portions of a plurality of ferrules 110 intersecting and overlapping in sequence, and the recovery ring 1111 is an annular structure, and the size of the recovery ring 1111 is adapted to the size of the opening of the recovery portion 111. The elastic recovery ring 1111 has good wall adhesion performance in the blood vessel, and can cover the inner wall of the blood vessel at all angles, and can also work normally for the recovery hook 210 in abnormal positions such as wall adhesion. In the process of the ferrule 110 being pulled by the guide 120 to introduce the two channels, the recovery part 111 formed by the ferrule 110 made of elastic material will be deformed, the volume of its recovery cavity will gradually decrease, the diameter of the recovery ring 1111 and the diameter of the opening will also gradually decrease synchronously, and the distance between the recovery ring 1111 and the sheath tube opening will also gradually decrease. In the process of recovering the filter in the present application, the recovery hook 210 of the filter is placed in the recovery cavity through the opening of the recovery part 111. Under the traction of the guide 120, the recovery part 111 is deformed, and the recovery cavity volume inside the recovery part 111 is gradually reduced. At the same time, the recovery ring 1111 of the recovery part 111 continuously shrinks toward the center direction of the recovery hook 210, until at least one ferrule 110 in the recovery part 111 is connected with the recovery hook 210. The shrinkage of the recovery ring 1111 toward the center direction will eventually pull the recovery hook 210 to the center position of the sheath tube opening. Under the further pulling of the guide 120 , the recovery portion 111 is sleeved with the recovery hook 210 into the channel of the sheath tube.

[0046] It should be noted that, in this embodiment, the structure of the recovery part 111 in the natural state is an umbrella-shaped structure. In other embodiments, the structure of the recovery part 111 in the natural state is an umbrella-like structure, a cylindrical structure, or a cylindrical-like structure that also has a recovery cavity and an opening, which is not specifically limited here.

[0047] Specifically, the ferrule 110 is an annular filamentary structure, and the recovery part 111 formed by a plurality of ferrules 110 is woven. In the present embodiment, the recovery part 111 is formed by 6 ferrules 110 woven together, and the six ferrules 110 are 360° circumferentially and evenly distributed in a multi-change full set design. The wire is fixed on the heat setting mold, and the adjacent braided wires are interlaced and woven downward, and the weaving method is 1 press 1. The tail of the ferrule 110 can be welded, hot air welded, viscose, or spirally woven on the guide 120 of the pipe or wire. In other embodiments, the number of ferrules 110 can be at least one, and one, two, three, four, five, six, seven, eight, nine, ten, etc. can be listed, which are not specifically limited here.

[0048] Furthermore, the ferrule 110 is made of elastic material, and the types of wire materials of the ferrule 110 include at least one of nickel-titanium alloy wire, platinum core nickel-titanium alloy wire, titanium alloy wire, stainless steel wire, gold-plated wire, and gold-plated tungsten wire.

[0049] Combination Figure 2 , Figure 3 As shown, Figure 2 and Figure 3 A schematic diagram of a recovery part 111 in a filter recovery assembly provided according to an embodiment of the present invention in an axial X-viewing angle and a schematic diagram of a single ferrule 110 in an axial X-viewing angle are respectively shown. The tails of all ferrules 110 are connected to the guide 120. The single ferrule 110 is an irregular annular structure in the axial X-viewing angle. The recovery part 111 formed by the outer edges of the six ferrules 110 weaving each other has a circular recovery ring 1111 in a natural state. The six ferrules 110, except for the part forming the recovery ring 1111, are cross-connected between the recovery ring 1111 and the guide 120 to form a six-petal flower shape. This structure further increases the probability of the recovery part 111 being connected to the recovery hook 210. In other embodiments, in the axial X-direction viewing angle, multiple ferrules 110 are cross-connected between the recovery ring 1111 and the guide 120 to form regular shapes such as equilateral polygons, polygonal stars or multi-petal flowers or other irregular shapes, which are not specifically limited here.

[0050] Specifically, the diameter of the recovery ring 1111 of the recovery part 111 is φ, wherein 2mm≤φ≤40mm. The recovery ring 1111 of this size is suitable for most blood vessels, thereby improving the wide adaptability of the product.

[0051] The recovery ring 1111 of the recovery part 111 of the filter recovery component of the present application is formed by weaving a ring 110 made of elastic material. While it is adaptable to most sizes of blood vessels, the recovery ring 1111 has good wall-adherence performance in the blood vessels. Therefore, during the recovery process, the recovery part 111 covers the blood vessels in all directions and angles. Any shape of recovery hook 210 on the market can be connected to it through the recovery ring 1111 or the rest of the recovery part 111. Even the recovery hook 210 in abnormal positions such as tilted or adhered to the wall in the blood vessel can be accurately connected, which greatly improves the capture efficiency of the recovery hook 210, reduces the surgical radiation exposure time of patients and doctors, and avoids secondary damage to patients.

[0052] The present application further discloses a filter system, which includes the filter recovery component as described above, and further includes a filter.

[0053] Reference Figure 4 As shown, this application, Figure 4 A schematic structural diagram of a filter in a filter system provided according to an embodiment of the present invention is shown, wherein the filter includes a recovery hook 210, a support portion and a positioning portion. The support portion includes a plurality of support rods 221, one end of the plurality of support rods 221 is gathered and connected to the recovery hook 210, and the other end is distributed in an umbrella shape along the axial X direction. The positioning portion includes a plurality of positioning rods 231, one end of the plurality of positioning rods 231 is gathered and connected to the recovery hook 210, and the other end is distributed in an umbrella shape along the axial X direction. The recovery hook 210 is arranged at the gathering point of the support rods 221 and the positioning rods 231 and faces the opposite direction of the axial X direction. The support rods 221 and the positioning rods 231 are alternately arranged in the circumferential direction. The umbrella-shaped support portion and the positioning portion can effectively block thrombus and greatly improve the treatment effect.

[0054] In this embodiment, the number of support rods 221 is six, and the number of positioning rods 231 is six. In other embodiments, the number of support rods 221 and positioning rods 231 can be more than six, which is not specifically limited here. The end of the support rod 221 away from the recovery hook 210 is bent toward the center direction, so that the outer edge side wall of the support rod 221 can be close to the inner wall of the blood vessel, play a supporting role, and improve the supporting performance of the product. The positioning rod 231 includes a proximal positioning rod 2311 and a distal positioning rod 2312, and the proximal positioning rod 2311 and the distal positioning rod 2312 are staggered, and the proximal positioning rod 2311 and the distal positioning rod 2312 are alternately arranged in the circumferential direction. The proximal positioning rod 2311 is connected to the end of the recovery hook 210 by a positioning hook 2313 bent in the radial direction, and the positioning hook 2313 is hooked on the inner wall of the blood vessel to position the filter to prevent the filter from shifting toward the distal end in the venous blood vessel. The end of the distal positioning rod 2312 away from the recovery hook 210 is provided with a radially bent hook 2314, and the barb 2314 is tilted toward the center as a whole. The barb 2314 hooks on the inner wall of the blood vessel to position the filter and prevent the filter from being displaced toward the proximal end in the vein.

[0055] Furthermore, the positioning hook 2313 and the barb 2314 are cut and formed in one piece, and the direction of the wire is changed by twisting the wire so that the positioning hook 2313 and the barb 2314 remain in the radial direction, and the one-piece wire has high strength and can firmly grasp the inner wall of the blood vessel.

[0056] like Figure 5 As shown, the proximal positioning rod 2311 is bent toward the center direction so that when the filter is in the stored state, the proximal positioning rod 2311 is staggered with the central axis, and the positioning hook 2313 of the proximal positioning rod 2311 is toward the central axis, so as to prevent the positioning hook 2313 from scratching the inner wall of the blood vessel or hooking the wall of the sheath and getting stuck at the tube mouth of the sheath during the recovery process, so that the filter of the present application can be recovered with a single-layer sheath, simplifying the recovery operation and reducing the production cost.

[0057] like Figure 6 As shown, a recovery slope 2315 is provided on the side of the distal positioning rod 2312 away from the center direction. During the process of recovering the filter, the inclined setting of the hook 2314 and the setting of the recovery slope 2315 prevent the hook 2314 from contacting the inner wall of the sheath, thereby preventing the hook 2314 from scratching the inner wall of the blood vessel during the recovery process or the hook 2314 from hooking the sheath wall and getting stuck at the tube mouth of the sheath. This can be suitable for recovery sheaths with smaller diameters, reduce the difficulty of recovering the filter, shorten the operation time, and reduce the risk of surgery.

[0058] In this embodiment, there are three proximal positioning rods 2311 and three distal positioning rods 2312. In other embodiments, the number of the proximal positioning rods 2311 and the distal positioning rods 2312 is greater than three, which is not specifically limited here.

[0059] Combination Figure 7 , Figure 8 As shown, the distances between the planes where the ends of the proximal positioning rod 2311 and the distal positioning tube away from the retrieval hook 210 in the axial X direction are not the same from the retrieval hook 210, and the distance between the plane where the end of the distal positioning rod 2312 is located and the retrieval is farther than the distance between the plane where the end of the proximal positioning tube is located and the retrieval, so that the positioning hook 2313 of the proximal positioning rod 2311 and the barb 2314 of the distal positioning rod 2312 are staggered in the axial X direction, further improving the overall performance of the proximal positioning rod 2311 and the distal positioning rod 2312 in grasping the wall in the blood vessel.

[0060] The lengths of the proximal positioning rod 2311 and the distal positioning rod 2312 and the inclination angles with the central axis are different, but the diameters of the circumscribed circle where the end of the proximal positioning rod 2311 is located are equal to the diameters of the circumscribed circle where the end of the distal positioning rod 2312 is located, further improving the overall firm grasping performance of the proximal positioning rod 2311 and the distal positioning rod 2312 in the blood vessel.

[0061] In this embodiment, the ends of the support rod 221 away from the recovery hook 210 are connected to form an equilateral hexagon, and the ends of the proximal positioning rod 2311 and the distal positioning rod 2312 are also connected to form an equilateral hexagon. The equilateral hexagons formed by the support portion and the positioning portion have different heights in the axial X direction and are staggered with each other (the corresponding sides of the two equilateral hexagons are not parallel to each other), so that the structure of the filter in the blood vessel is more stable, avoiding the filter from tilting in the blood vessel, and greatly improving the treatment effect.

[0062] 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.

[0063] 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 filter recovery assembly, characterized in that: include: A sheath tube, wherein the sheath tube has a passage extending in the axial direction, and the sheath tube has a pipe opening at one end in the axial direction, and the pipe opening is communicated with the passage; a guide member, the guide member being accommodated in the sheath tube; A ferrule, the ferrule is exposed from the pipe opening and is drivingly connected to the guide member, and at least a portion of the ferrule can be movably introduced into the channel and deformed under the influence of the guide member; Among them, a plurality of the ferrules are evenly distributed circumferentially to form a recovery portion, and the outer edge of the recovery portion is a recovery ring of an annular structure; during the process of introducing the ferrule into the channel, the diameter of the recovery ring gradually decreases.

2. The filter recovery assembly according to claim 1, characterized in that: The recovery part has an opening on one side away from the sheath tube, and the recovery part has a recovery cavity in communication with the opening, wherein the radial cross section of the recovery cavity gradually increases along the axial direction; During the process of introducing the ferrule into the channel, the volume of the recovery cavity gradually decreases; Wherein, the diameter of the opening is matched with the diameter of the recovery ring.

3. The filter recovery assembly according to claim 1 or 2, characterized in that: The recovery part is an umbrella-shaped structure.

4. The filter recovery assembly according to claim 1, characterized in that: Also includes: A handle, the handle being arranged at one end of the sheath away from the ferrule, the handle being connected to the guide member; The loading device is a tubular structure, the loading device is coaxially accommodated in the sheath tube, and the guide is penetrated in the loading device.

5. The filter recovery assembly according to claim 1 or 2, characterized in that: The diameter of the recovery ring is φ, wherein 2mm≤φ≤40mm.

6. The filter recovery assembly according to claim 1, characterized in that: The types of the ferrule include at least one of nickel-titanium alloy wire, platinum core nickel-titanium alloy wire, titanium alloy wire, stainless steel wire, gold-plated wire, and gold-plated tungsten wire.

7. The filter recovery assembly according to claim 1, characterized in that: The number of the collar is at least one.

8. A filter system, characterized in that: The filter system comprises a filter recovery assembly according to any one of claims 1 to 7, wherein the filter system further comprises: A filter, comprising: A recovery hook, the recovery hook facing in the opposite direction of the axial direction; A support portion, comprising a plurality of support rods, one end of the plurality of support rods being gathered and connected to the recovery hook, and the other end of the plurality of support rods being distributed in an umbrella shape along the axial direction; A positioning part, comprising a plurality of positioning rods, one end of which is gathered and connected to the recovery hook, and the other end of which is distributed in an umbrella shape along the axial direction; Among them, the positioning rod and the supporting rod are arranged alternately; when the ring is introduced into the channel, the recovery hook is hooked with any ring in the recovery part and the recovery hook is introduced into the channel.

9. The filter system according to claim 8, characterized in that The end of the support rod away from the recovery hook is bent toward the center; The positioning rod includes a proximal positioning rod and a distal positioning rod, and the proximal positioning rod and the distal positioning rod are arranged alternately in sequence along the circumferential direction; the end of the proximal positioning rod away from the recovery hook is provided with a positioning hook bent in the radial direction; the end of the distal positioning rod away from the recovery hook is provided with a barb bent in the radial direction, the barb is inclined toward the center direction as a whole, and a recovery slope is provided on the side of the barb away from the center axis.

10. The filter system according to claim 9, characterized in that The circumscribed circle formed by the end of the proximal positioning rod away from the recovery hook and the circumscribed circle formed by the end of the distal positioning rod away from the recovery hook have the same diameter and are in the same plane.

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