Auxiliary device and conveyor

Abstract

The present invention provides an auxiliary device and a conveyor, wherein the conveyor comprises the auxiliary device, wherein the auxiliary device comprises a first transition section, a main section, and a second transition section connected in sequence axially, and the outer diameter of the first transition section and the outer diameter of the second transition section gradually decrease in a direction away from the main section. When the conveyor is used to convey an implant into a target cavity for release, the auxiliary device can be used to improve the coaxiality between the implant and the target cavity, improve the thrombus capture effect, improve the therapeutic effect, and facilitate recovery.

Description

[0001] This case is a divisional application. The application number of the original application is 202110625881.6, the application date is June 4, 2021, and the name is an auxiliary device and conveyor. Technical Field

[0002] The present invention relates to the technical field of medical devices, and in particular to an auxiliary device and a conveyor. Background Art

[0003] Once deep vein thrombosis breaks off, the thrombus will flow back to the heart along the veins, and then be pumped from the heart to the pulmonary artery and block the pulmonary artery to form a pulmonary embolism. Pulmonary embolism is an acute disease with a high clinical morbidity and mortality rate, which is mostly caused by pulmonary embolism. The vena cava filter is an implanted medical device placed in the vena cava to capture thrombi and prevent them from moving up to the heart and lungs to prevent pulmonary embolism. With the development of clinical technology and manufacturing technology, the performance and implantation methods of vena cava filters have made great progress, but the vena cava filters in the prior art still have the problem of tilting after release, resulting in the inability to effectively capture thrombi. Summary of the invention

[0004] The object of the present invention is to provide an auxiliary device and a conveyor, which can be delivered into the body together with an implant such as a filter, and is used to assist the implant in being placed centrally in the blood vessel during the implant release process, thereby preventing the implant from tilting and improving the thrombus capture effect.

[0005] To achieve the above-mentioned purpose, the present invention provides an auxiliary device for assisting the implant to be positioned in a target cavity in a predetermined posture when releasing the implant; the auxiliary device comprises a first transition section, a main section and a second transition section axially connected in sequence, the first transition section, the main section and the second transition section are woven from wire material, and the outer diameters of the first transition section and the second transition section gradually decrease in a direction away from the main section.

[0006] Optionally, an outer diameter of at least a portion of the main body section is greater than or equal to a maximum outer diameter of the first transition section and the second transition section.

[0007] Optionally, the first transition section and the second transition section are arranged in a mirror-symmetrical manner at two axial ends of the main body section.

[0008] Optionally, the axial length of the first transition section is smaller than the axial length of the second transition section.

[0009] Optionally, the auxiliary device further comprises a first connecting ring coaxially connected to an end of the first transition section away from the main section; and / or,

[0010] The auxiliary device also includes a second connecting ring coaxially connected to an end of the second transition section away from the main body section.

[0011] Optionally, a diamond-shaped hole is formed on the main body segment, and the diamond-shaped hole has a first inner angle and a second inner angle, and the angle bisector of the first inner angle is parallel to the axis of the main body segment; when the auxiliary device is in an expanded state, the angle of the first inner angle is greater than or equal to the angle of the second inner angle.

[0012] Optionally, the number of the wires is 10 to 14, the side length of the diamond-shaped hole is 1 mm to 1.5 mm, the angle of the first inner angle is 90° to 160°; and / or the wire diameter of the wire is 0.15 mm to 0.4 mm.

[0013] Optionally, the outer diameter of the main body segment is 16 mm to 30 mm, and the axial length is 30 mm to 50 mm.

[0014] Optionally, the auxiliary device is a self-expanding structure.

[0015] To achieve the above object, the present invention further provides a conveyor, comprising a conveying device and an auxiliary device as described in any of the preceding items; the conveying device is movably connected to the auxiliary device to control the radial expansion or contraction of the auxiliary device; the conveying device is also used to connect to an implant;

[0016] The conveyor is configured as a conveying device for conveying the implant and the auxiliary device to a predetermined position of a target cavity, and the conveying device is also used to release the implant, and when releasing the implant, the conveying device also controls the expansion of the auxiliary device and positions the implant in a predetermined posture at a corresponding predetermined position.

[0017] Compared with the prior art, the auxiliary device and the conveyor of the present invention have the following advantages:

[0018] The aforementioned conveyor includes the auxiliary device, and the auxiliary device includes a first transition section, a main section, and a second transition section that are axially connected in sequence, and the outer diameters of the first transition section and the second transition section gradually decrease in a direction away from the main section. When the conveyor is used to convey the implant into a target cavity for release, the auxiliary device can be used to improve the coaxiality of the implant and the target cavity, improve the thrombus capture effect, facilitate recovery, and improve the therapeutic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0020] Figure 1is a schematic structural diagram of an auxiliary device provided according to an embodiment of the present invention, in which the first transition section and the second transition section are arranged in mirror symmetry;

[0021] Figure 2 is a schematic structural diagram of an auxiliary device provided according to an embodiment of the present invention, in which the axial length of the first transition section is smaller than the axial length of the second transition section;

[0022] Figure 3 is a structural schematic diagram of a main body section of an auxiliary device provided according to an embodiment of the present invention;

[0023] Figure 4 is a partially enlarged schematic diagram of a main body section of an auxiliary device provided according to an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of a conveyor provided according to an embodiment of the present invention;

[0025] Figure 6 is a schematic structural diagram of an auxiliary device provided according to another embodiment of the present invention, in which the first transition section and the second transition section are arranged in mirror symmetry;

[0026] Figure 7 is a schematic structural diagram of an auxiliary device provided according to another embodiment of the present invention, in which the axial length of the first transition section is smaller than the axial length of the second transition section;

[0027] Figure 8 yes Figure 7 A schematic diagram of the dimensions of the auxiliary structure shown;

[0028] Fig. 9 is a schematic structural diagram of a conveyor provided according to another embodiment of the present invention;

[0029] Fig.10 is a schematic diagram of a use scenario of the auxiliary device provided by an embodiment of the present invention, in which the auxiliary device and the filter are delivered from the jugular vein to the vena cava, and the auxiliary device is located at the proximal end of the filter;

[0030] Fig.11 It is a schematic diagram of a usage scenario of the auxiliary device provided in an embodiment of the present invention. In the figure, the auxiliary device and the filter are delivered from the femoral vein to the vena cava, and the auxiliary device is located at the distal end of the filter.

[0031] [Description of reference numerals is as follows]:

[0032] 100- auxiliary device, 110- first transition section, 120- main section, 121- diamond hole, 130- second transition section, 140- first connecting ring, 150- second connecting ring;

[0033] 200-filter, 210-filter rod;

[0034] 310 - tube assembly, 311 - inner tube, 312 - outer tube, 321 - limiting sleeve, 330 - handle, 341 - driving button, 342 - slider, 343 - sliding groove, 350 - sheath;

[0035] 10-Conveyor. DETAILED DESCRIPTION

[0036] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0037] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0038] As used in this specification, the singular forms "a", "an", and "the" include plural objects, and the plural form "plurality" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used to include the meaning of "and / or", unless the content clearly indicates otherwise, and 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 or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be a connection between the internal parts of two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0040] Figure 1 , Figure 2 , Figure 6 and Figure 7 FIG. 1 is a schematic diagram showing the structure of the auxiliary device 100 provided in an embodiment of the present invention. Figure 1 , Figure 2 , Figure 6 and Figure 7 The auxiliary device 100 includes a first transition section 110, a main section 120, and a second transition section 130 which are connected in sequence axially. In the direction away from the main section 120, the outer diameters of the first transition section 110 and the second transition section 130 gradually decrease. The auxiliary device 100 is used to be delivered into the patient's body at the same time as the implant, and to assist the implant in being positioned in a predetermined posture in the target cavity when the implant is released. Optionally, the implant is a filter 200 (such as Fig.10 and Fig.11 In general, the filter 200 is used to be released in the inferior vena cava (i.e., the aforementioned target cavity) to capture thrombi and prevent the thrombi from entering the heart and then the pulmonary artery to cause pulmonary embolism. In actual work, when the filter 200 is implanted in the inferior vena cava, it is hoped that the filter 200 can be centrally positioned in the vena cava to improve the thrombus capture effect. Here, "centrally positioned" means that the filter 200 is coaxially arranged with the inferior vena cava. In the following text, the implant is described by taking the filter 200 as an example.

[0041] In practice, the auxiliary device 100 and the filter 200 are coaxially arranged and synchronously delivered to the inferior vena cava. Before the filter 200 is completely released, the auxiliary device 100 is radially expanded to the junction of the main section 120 and the first transition section 110 and the junction of the main section 120 and the second transition section 130 against the wall of the inferior vena cava, or the main section 120 is at least partially against the wall of the inferior vena cava, until the auxiliary device 100 is coaxially arranged with the inferior vena cava. At this time, the release of the filter 200 can improve the coaxiality of the filter 200 and the inferior vena cava, so that the filter 200 can be centrally positioned in the inferior vena cava. The specific use process will be described in detail later.

[0042] Those skilled in the art should understand that when at least part of the main body section 120 is used to abut against the wall of the inferior vena cava, the outer diameter of at least part of the main body section 120 should be greater than or equal to the maximum outer diameter of the first transition section 110 and the second transition section 120. In a typical embodiment, the main body section 120 includes a plurality of cylindrical segments, and the outer diameter of the cylindrical segments can be equal to the maximum outer diameter of the first transition section 110 and the second transition section 120. Such an arrangement can make the cylindrical segments abut against the wall of the inferior vena cava, and the main body section 120 also forms a surface contact with the vessel wall, thereby enhancing the support force and stability and improving reliability. Alternatively, the projection of the contour of the outer wall of the main body section 120 on a plane parallel to the axis of the main body section can also be a curve, as long as the main body section 120 can at least partially abut against the wall of the inferior vena cava after expansion, and the auxiliary device 100 is centrally arranged in the inferior vena cava. In addition, it should be noted that in order to allow the auxiliary device 100 to expand smoothly in the body, the auxiliary device 100 is preferably a self-expanding structure, which means that the structure itself has good resilience, deforms when subjected to pressure, and automatically rebounds to its original shape after the pressure is removed. Usually, the self-expanding structure is made of shape memory material such as nickel titanium.

[0043] Please continue to refer to Figure 1 and Figure 6 In some embodiments, the first transition section 110 and the second transition section 130 are arranged at the two axial ends of the main section 120 in a mirror-symmetrical manner. Figure 2 and Figure 7 In other embodiments, the axial lengths of the first transition section 110 and the second transition section 130 are not equal, for example, the axial length of the first transition section 110 is smaller than the axial length of the second transition section 130. When working, the first transition section 110 is preferably closer to the filter 200. The advantage of such a setting is that the axial distance between the auxiliary device 100 and the filter 200 is shortened, which is conducive to further improving the coaxiality of the filter 200 and the inferior vena cava.

[0044] The present invention does not limit the molding method of the auxiliary device 100. In some embodiments, please refer to Figure 1 and Figure 2The first transition section 110, the main section 120 and the third transition section 130 are woven from wire, and the main section 120 preferably includes a cylindrical section, which is easy to shape. Further, the auxiliary device 100 also includes a first connecting ring 140 and a second connecting ring 150. The first connecting ring 140 is coaxially arranged at one end of the first transition section 110 away from the main section 120, and binds one free end of the wire; the second connecting ring 150 is coaxially arranged at one end of the second transition section 130 away from the main section 120, and binds the other free end of the wire.

[0045] Please focus on Figure 3 and Figure 4 , when the auxiliary device 100 is in an expanded state, a diamond hole 121 is formed on the main section 120, and the diamond hole 121 has a first internal angle β and a second internal angle θ, wherein the angle bisector of the first internal angle β is parallel to the axis of the main section 120, and the angle of the first internal angle β is greater than or equal to the angle of the second internal angle θ. The side length A of the diamond hole 121, the angle of the internal angle, and the number of wires used jointly affect the anti-extrusion performance (i.e., support strength) of the auxiliary device 100. Specifically, when the number of wires is fixed, the shorter the side length A of the diamond hole 121, the larger the first internal angle β, the stronger the anti-extrusion performance of the auxiliary device 100, and the better the bending performance; conversely, the longer the side length A of the diamond hole 121, the smaller the first internal angle β, the weaker the anti-extrusion performance of the auxiliary device 100, and the worse the bending performance. When the side length A is fixed, the more the number of the wires is, the smaller the first inner angle β is, the weaker the anti-extrusion performance of the auxiliary device 100 is, and the worse the bending performance is; conversely, the fewer the number of the wires is, the larger the first inner angle β is, the stronger the anti-extrusion performance of the auxiliary device 100 is, and the better the bending performance is. When the first inner angle β is fixed, the more the number of the wires is, the shorter the side length A is, the stronger the anti-extrusion performance of the auxiliary device 100 is, and the better the bending performance is; the fewer the number of the wires is, the longer the side length A is, the weaker the anti-extrusion performance of the auxiliary device 100 is, and the worse the bending performance is.

[0046] In practice, the auxiliary device 100 needs to have good anti-extrusion performance and bending performance, and should also have a smaller radial dimension (referring to the radial dimension when the auxiliary device is in a compressed state). Based on this, it is preferred that the number of the wires is 10 to 14, and the wire diameter of the wire is 0.15 mm to 0.4 mm, the side length A of the diamond hole 121 is 1 mm to 1.5 mm, and the angle of the first internal angle β is 90° to 160°. In addition, the axial length L of the main body segment 120 (when the main body segment 120 includes a cylindrical segment) is preferably 1 30mm~50mm, outer diameter Φ 1It is understood that the dimensions mentioned herein all refer to the relevant dimensions when the auxiliary device 100 is in an expanded state.

[0047] The braided auxiliary device 100 is relatively soft and can expand according to the diameter of the inferior vena cava during expansion, thereby reducing damage to the vascular wall. In addition, by reasonably designing the relevant dimensions of the auxiliary device 100, the outer diameter of the auxiliary device 100 when compressed can be 1mm to 2mm, and can be compressed in a 6F to 10F sheath for delivery.

[0048] In other embodiments, please refer to Figures 6 to 8 The auxiliary device 100 can also be formed by cutting a tube and then shaping it. When the tube is cut, the first connecting ring 140 can be formed at the end of the first transition section 110 away from the main section 120, and the second connecting ring 150 can be formed at the end of the second transition section 130 away from the main section 120.

[0049] In the cutting and forming auxiliary device 100, it is preferred that the minimum outer diameter of the auxiliary device 100 is 2 (ie, the outer diameter of the first connecting ring 140 and the outer diameter of the second connecting ring 150) is 1 mm to 2.3 mm, and the maximum outer diameter Φ 3 (i.e., the maximum outer diameter of the main body section 120) is 16 mm to 30 mm, and the axial length L 2 45mm~60mm.

[0050] For further information, please refer to Figure 5 and Fig. 9 The embodiment of the present invention further provides a conveyor 10, comprising a conveying device and the auxiliary device 100 as described above. The conveying device is movably connected to the auxiliary device 100, and controls the radial expansion or contraction of the auxiliary device 100. The conveying device is also used to connect with the filter 200. The conveyor is configured such that the conveying device is used to convey the auxiliary device 100 and the filter 200 to a predetermined position of the target cavity, the conveying device is also used to release the filter 200, and when releasing the filter 200, the conveying device also controls the radial expansion of the auxiliary device 100 and positions the filter 200 at a corresponding predetermined position in a predetermined posture.

[0051] The structure of the conveyor 10 and its matching relationship with the filter 200 are explained below in conjunction with a specific application scenario of the auxiliary device 100.

[0052] Hereinafter, the terms "distal end" and "proximal end" are defined according to the position of the filter 200 relative to the heart after being implanted in the patient's body. The "distal end" refers to the end of the filter 200 that is farther from the heart, and the "proximal end" refers to the end of the filter 200 that is closer to the heart. The terms "distal end" and "proximal end" refer to the relative position, relative location, and direction of components or actions relative to each other from the perspective of an operator using the conveyor 10. The "distal end" generally refers to the end that first enters the patient's body, and the "proximal end" generally refers to the end of the conveyor 10 that is closer to the operator during normal operation.

[0053] Fig.10 FIG. 2 shows a schematic diagram of delivering the auxiliary device 100 and the filter 200 to the vena cava via the jugular vein. Fig.10 As shown, the auxiliary device 100 is disposed at the proximal end of the filter 200 .

[0054] Please focus on Figure 5 and Fig. 9 Combined with Fig.10 The delivery device used in this scenario includes a tube assembly 310, a rear release assembly and a handle 330. The tube assembly 310 includes at least an inner tube 311. The distal structure of the rear release assembly is partially connected to the distal end of the inner tube 311 and is coaxially arranged with the inner tube 311; the handle 330 is connected to the proximal end of the tube assembly 310 and the proximal end of the rear release assembly. The auxiliary device 100 is sleeved on the inner tube 311 and can at least partially move along the axial direction of the inner tube 311 to allow the auxiliary device 100 to expand or contract radially. The proximal end of the filter 200 is detachably connected to the distal structure of the rear release assembly, and the filter 200 is coaxially arranged with the distal structure of the rear release assembly.

[0055] In more detail, the tube assembly 310 further includes an outer tube 312, which is sleeved on the outside of the inner tube 311 and can move along the axial direction of the inner tube 311. The rear release assembly includes a limit sleeve 321, a binding member (not shown in the figure) and a connecting wire (not shown in the figure), wherein the limit sleeve 321 and the binding member constitute the distal structure, wherein the limit sleeve 321 is fixedly connected to the distal end of the inner tube 311 and communicates with the inner tube 311; the binding member is movably arranged in the limit sleeve 321, the connecting wire is movably passed through the inner tube 311, and the distal end of the connecting wire is connected to the binding member, and the proximal end of the connecting wire is the proximal end of the rear release assembly. The handle 330 is connected to the tube assembly 310 and the proximal end of the connecting wire, and is used to drive the inner tube 311 and the outer tube 312 to move along the axial direction of the tube assembly 310. The distal end of the auxiliary device 100 is fixedly connected to the inner tube 311, and the proximal end of the auxiliary device 100 is sleeved on the inner tube 311 and can move axially along the inner tube 311, and the proximal end of the auxiliary device 100 is also fixedly connected to the distal end of the outer tube 312, so that when the outer tube 312 moves on the inner tube 311 along the proximal end to the distal end (that is, the outer tube 312 is pushed toward the body), the auxiliary device 100 can expand radially, and when the outer tube 312 moves on the inner tube 311 along the distal end to the proximal end (that is, the outer tube 312 is withdrawn toward the outside of the body), the auxiliary device 100 can contract radially.

[0056] When the first transition section 110 and the second transition section 130 of the auxiliary device 100 are symmetrically arranged, any one of the two axial ends of the auxiliary device 100 can be used as the proximal end of the auxiliary device 100, and the other end can be used as the distal end of the auxiliary device 100. When the axial length of the first transition section 110 of the auxiliary device 100 is less than the axial length of the second transition section 130, the end of the first transition section 110 away from the main section 120 is used as the distal end of the auxiliary device 100, and the end of the second transition section 130 away from the main section 120 is used as the proximal end of the auxiliary device 100. That is, the first connecting ring 140 is fixedly mounted on the inner tube 311, and the second connecting ring 150 is movably mounted on the inner tube 311.

[0057] In addition, the handle 330 may be provided with a first driving unit and a second driving unit. The first driving unit is used to control the outer tube 312 to make axial movement relative to the inner tube 311, and may include a driving button 341, a first slider 342 and a sliding groove 343. The first slider 342 is movably arranged inside the handle 330 and connected to the proximal end of the outer tube 312. A part of the driving button 341 is located inside the sliding groove 343 and connected to the first slider 342, and another part of the driving button 341 is exposed outside the sliding groove 343, and is used to receive external force and move along the axial direction of the handle 330 under the action of the external force, so as to drive the outer tube 312 to make axial movement relative to the inner tube 311. The second driving unit is used to control the inner tube 311 to make axial movement relative to the connecting wire, and its structure is similar to that of the first driving unit, which will not be repeated here.

[0058] The limiting sleeve 321 is located outside the distal end of the auxiliary device 100, and a recovery component such as a recovery hook may be provided on the proximal end of the filter 200. The recovery hook is used to extend into the limiting sleeve 321, and the limiting sleeve 321 cooperates with the restraining member so that the recovery hook is detachably connected to the rear release component. In a non-limiting embodiment, the restraining member includes a second slider, and a groove is formed on the second slider. The groove and the inner wall of the limiting sleeve together constitute a limiting space, and the recovery hook is used to be accommodated in the limiting space. When the second slider and the limiting sleeve produce relative movement, and the groove at least partially exposes the limiting sleeve and releases the limiting effect on the recovery hook, the recovery hook is disconnected from the rear release component (not shown in the figure).

[0059] The delivery device further includes a sheath tube 350, which is used to be movably mounted outside the tube assembly 310, the auxiliary device 100 and the filter 200. It can be understood that when the sheath tube is mounted outside the auxiliary device 100 and the filter 200, the auxiliary device 100 and the filter 200 are both in a compressed state.

[0060] After the auxiliary device 100, the filter 200 and the delivery device are assembled, the delivery device is used to deliver the auxiliary device 100 and the filter 200 to the predetermined position of the inferior vena cava, and then the sheath 350 is withdrawn to expose the filter 200. It can be known that the front release is completed after the filter 200 is exposed (i.e., the filtering part of the filter 200 is expanded). Then the sheath 350 is further withdrawn to expose the auxiliary device 100, and then the outer tube 312 is pushed forward to expand the auxiliary device 100. The outer tube 312 is adjusted according to the diameter at the predetermined position of the inferior vena cava to adjust the expansion degree of the auxiliary device 100, so that the main body section 120 of the auxiliary device 100 supports the blood vessel wall at the predetermined position. At this time, the auxiliary device 100 is coaxially arranged with the blood vessel at this position, so that the filter 200 is also arranged substantially coaxially with the blood vessel. Then, the inner tube 311 is withdrawn to release the connection between the rear release assembly and the recovery hook of the filter 200 , thereby completing the rear release of the filter 200 .

[0061] The process of withdrawing the conveyor (i.e., the conveying device and the auxiliary device 100) from the body is as follows: the inner tube 311 is pushed forward by a wire, and the restraining member is recovered into the limiting sleeve 321, and then the outer tube 312 is withdrawn and the auxiliary device 100 is in a compressed state, and then the sheath tube 350 is pushed forward and the auxiliary device 100 and the limiting sleeve 321 are recovered into the sheath tube 350, and finally the conveyor is withdrawn from the body as a whole.

[0062] Fig.11 The schematic diagram shows the auxiliary device 100 and the filter 200 being delivered to the predetermined position of the vena cava along the femoral vein. In the figure, the auxiliary device 100 is located at the distal end of the filter 200. The delivery device used in this scene is similar to Fig.10 The delivery device used in the illustrated scenario is the same, but the distal end of the filter 200 is detachably connected to the post-release assembly.

[0063] Please refer to Fig.11 The filter 200 is basically in a conical structure and includes a plurality of filter rods 210, and the distal end of each filter rod 210 is retracted and connected to the recovery component; at least a portion of the distal ends of the filter rods 210 are formed with positioning components such as hooks (not shown in the figure). When the filter 200 is connected to the conveyor, at least a portion of the positioning components of the filter rods 210 are accommodated in the limiting space (taking the limiting space formed by the restraining member and the limiting sleeve 321, and the limiting space is used to accommodate part of the filter 200 as an example) to achieve a detachable connection between the filter 200 and the rear release component.

[0064] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An auxiliary device for assisting the implant to be positioned in a target cavity in a predetermined posture when releasing the implant, characterized in that: The auxiliary device comprises a first transition section, a main section and a second transition section which are connected in sequence axially, wherein the first transition section, the main section and the second transition section are woven from wire materials, and the outer diameters of the first transition section and the second transition section gradually decrease in a direction away from the main section, and the outer diameter of at least a part of the main section is greater than or equal to the maximum outer diameters of the first transition section and the second transition section; A diamond-shaped hole is formed on the main body segment, and the diamond-shaped hole has a first inner angle and a second inner angle. The angle bisector of the first inner angle is parallel to the axis of the main body segment, and when the auxiliary device is in an expanded state, the angle of the first inner angle is greater than or equal to the angle of the second inner angle; the number of the wires is 10 to 14, the side length of the diamond-shaped hole is 1 mm to 1.5 mm, and the angle of the first inner angle is 90° to 160°.

2. The auxiliary device according to claim 1, characterized in that The first transition section and the second transition section are arranged at two axial ends of the main body section in a mirror-symmetrical manner.

3. The auxiliary device according to claim 1, characterized in that An axial length of the first transition section is smaller than an axial length of the second transition section.

4. The auxiliary device according to any one of claims 1 to 3, characterized in that: The auxiliary device further comprises a first connecting ring coaxially connected to an end of the first transition section away from the main section; and / or, The auxiliary device also includes a second connecting ring coaxially connected to an end of the second transition section away from the main body section.

5. The auxiliary device according to claim 1, characterized in that The wire diameter of the wire material is 0.15 mm to 0.4 mm.

6. The auxiliary device according to claim 1, characterized in that The outer diameter of the main body section is 16 mm to 30 mm, and the axial length is 30 mm to 50 mm.

7. The auxiliary device according to claim 1, characterized in that The auxiliary device is a self-expanding structure.

8. A conveyor, characterized in that: The invention comprises a delivery device and an auxiliary device as described in any one of claims 1 to 7; the delivery device is movably connected to the auxiliary device and is used to control the radial expansion or contraction of the auxiliary device; the delivery device is also used to be connected to an implant; The delivery device is configured to deliver and release the implant to a predetermined position of a target cavity, and when releasing the implant, the delivery device further controls the auxiliary device to expand and position the implant at a corresponding predetermined position in a predetermined posture.

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