An auxiliary device and a conveyor

Abstract

The present invention provides an auxiliary device and a conveyor. The conveyor includes the auxiliary device. The auxiliary device includes a first transition section, a main body section, and a second transition section that are axially connected in sequence. Along the direction away from the main body section, the outer diameters of the first transition section and the second transition section gradually decrease. When using the conveyor to deliver 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, enhance the thrombus capture effect, improve the therapeutic effect, and facilitate retrieval.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an auxiliary device and a delivery device. Background Art

[0002] Once a deep vein thrombosis detaches, the thrombus will flow back to the heart along the vein, 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 relatively high clinical incidence and mortality, and most of the time it is caused by pulmonary artery embolism. A vena cava filter is a medical device implanted in the vena cava, which is used to capture thrombi and prevent the thrombi from moving up to the heart and lungs to prevent pulmonary artery 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 that they tilt after release and cannot effectively capture thrombi. Summary of the Invention

[0003] The purpose of the present invention is to provide an auxiliary device and a delivery device. The auxiliary device can be delivered into the body together with an implant such as a filter, and is used to assist the implant to be centered and placed in the blood vessel during the release process of the implant, avoid the implant from tilting, and improve the thrombus capture effect.

[0004] To achieve the above purpose, the present invention provides an auxiliary device for assisting the implant to be positioned in a target cavity in a predetermined posture when the implant is released; the auxiliary device includes a first transition section, a main body section, and a second transition section that are axially connected in sequence. Along the direction away from the main body section, the outer diameters of the first transition section and the second transition section gradually decrease.

[0005] Optionally, the outer diameter of at least part of the main body section is greater than or equal to the maximum outer diameters of the first transition section and the second transition section.

[0006] Optionally, the first transition section and the second transition section are arranged symmetrically about a mirror image at the axial two ends of the main body section.

[0007] Optionally, the axial length of the first transition section is less than the axial length of the second transition section.

[0008] Optionally, the auxiliary device further includes a first connection ring coaxially connected to the end of the first transition section away from the main body section; and / or,

[0009] The auxiliary device further includes a second connection ring coaxially connected to the end of the second transition section away from the main body section.

[0010] Optionally, the first transition section, the main body section, and the second transition section are woven from wire materials.

[0011] Optionally, diamond-shaped holes are formed in the main body section. The diamond-shaped holes have a first interior angle and a second interior angle, and the angle bisector of the first interior angle is parallel to the axis of the main body section; when the auxiliary device is in the expanded state, the angle of the first interior angle is greater than or equal to the angle of the second interior angle.

[0012] Optionally, the number of the wire materials 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 interior angle is 90° to 160°; and / or, the wire diameter of the wire material is 0.15 mm to 0.4 mm.

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

[0014] Optionally, the auxiliary device is cut from a pipe.

[0015] Optionally, the minimum outer diameter of the auxiliary device is 1 mm to 2.3 mm, the maximum outer diameter is 16 mm to 30 mm, and the axial length is 45 mm to 60 mm.

[0016] Optionally, the auxiliary device is a self-expanding structure.

[0017] To achieve the above object, the present invention further provides a delivery device, including a delivery means and the auxiliary device as described in any one of the preceding items; the delivery means is movably connected to the auxiliary device for controlling radial expansion or contraction of the auxiliary device; the delivery means is further used for connecting with an implant;

[0018] The delivery device is configured such that the delivery means is used for delivering the implant and the auxiliary device to a predetermined position in a target cavity, the delivery means is further used for releasing the implant, and when releasing the implant, the delivery means further controls the expansion of the auxiliary device and positions the implant in the corresponding predetermined position in a predetermined posture.

[0019] Compared with the prior art, the auxiliary device and the delivery device of the present invention have the following advantages:

[0020] The aforementioned delivery device includes the auxiliary device. The auxiliary device includes a first transition section, a main body section, and a second transition section that are axially connected in sequence. Along the direction away from the main body section, the outer diameters of the first transition section and the second transition section gradually decrease. When using the delivery device to deliver 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, enhance the thrombus capture effect, facilitate recovery, and improve the curative effect. Description of the Drawings

[0021] The accompanying drawings are used to better understand the present invention and do not constitute an undue limitation to the present invention. Among them:

[0022] Figure 1 is a schematic structural diagram of an auxiliary device provided by the present invention according to an embodiment. In the illustration, the first transition section and the second transition section are arranged in mirror symmetry;

[0023] Figure 2 is a schematic structural diagram of an auxiliary device provided by the present invention according to an embodiment. In the illustration, the axial length of the first transition section is less than the axial length of the second transition section;

[0024] Figure 3 is a schematic structural diagram of the main body section of an auxiliary device provided by the present invention according to an embodiment;

[0025] Figure 4 is a partially enlarged schematic diagram of the main body section of an auxiliary device provided by the present invention according to an embodiment;

[0026] Figure 5 is a schematic structural diagram of a conveyor provided by the present invention according to an embodiment;

[0027] Figure 6 is a schematic structural diagram of an auxiliary device provided by the present invention according to another embodiment. In the illustration, the first transition section and the second transition section are arranged in mirror symmetry;

[0028] Figure 7 is a schematic structural diagram of an auxiliary device provided by the present invention according to another embodiment. In the illustration, the axial length of the first transition section is less than the axial length of the second transition section;

[0029] Figure 8 is Figure 7 a schematic diagram of the dimensions of the auxiliary structure shown;

[0030] Figure 9 is a schematic structural diagram of a conveyor provided by the present invention according to another embodiment;

[0031] Figure 10 is a schematic diagram of the usage scenario of an auxiliary device provided by an embodiment of the present invention. In the illustration, 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;

[0032] Figure 11 is a schematic diagram of the usage scenario of an auxiliary device provided by an embodiment of the present invention. In the illustration, 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.

[0033] [Explanation of reference numerals is as follows]:

[0034] 100 - Auxiliary device, 110 - First transition section, 120 - Main body section, 121 - Diamond-shaped hole, 130 - Second transition section, 140 - First connecting ring, 150 - Second connecting ring;

[0035] 200 - Filter, 210 - Filter rod;

[0036] 310 - Tube assembly, 311 - Inner tube, 312 - Outer tube, 321 - Limit sleeve, 330 - Handle, 341 - Driving button, 342 - Slide block, 343 - Sliding groove, 350 - Sheath tube;

[0037] 10 - Conveyor. Detailed implementation manner

[0038] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0039] In addition, each of the following description content embodiments has one or more technical features. However, this does not mean that those who use the present invention must implement all the technical features in any one embodiment at the same time, or can only separately implement some or all of the technical features in different embodiments. In other words, on the premise that implementation is possible, those skilled in the art can, according to the disclosure content of the present invention and in view of design specifications or implementation requirements, selectively implement some or all of the technical features in any one embodiment, or selectively implement the combination of some or all of the technical features in multiple embodiments, thereby increasing the flexibility when implementing the present invention.

[0040] As used in this specification, the singular forms "a", "an", and "the" include plural referents, and the plural form "plural" includes more than two referents, unless the context clearly dictates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the context clearly dictates otherwise, and the terms "mounted", "connected", and "coupled" should be construed broadly. For example, they can be fixedly connected, detachably connected, or integrally connected. They can be mechanically connected or electrically connected. They can be directly connected or indirectly connected through an intermediate medium, and can be the communication within two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are in very simplified forms and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0042] Figure 1 、 Figure 2 、 Figure 6 and Figure 7 show a schematic structural view of the auxiliary device 100 provided by an embodiment of the present invention. Please refer to Figure 1 、 Figure 2 、 Figure 6 and Figure 7 , the auxiliary device 100 includes a first transition section 110, a main body section 120, and a second transition section 130 that are axially connected in sequence. Along the direction away from the main body 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 a patient's body together with an implant, and assist the implant to be positioned in a target cavity in a predetermined posture when the implant is released. Optionally, the implant is a filter 200 (as Figure 10 and Figure 11 marked). Generally, 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 entering the pulmonary artery to cause pulmonary embolism. In actual work, when implanting the filter 200 into the inferior vena cava, it is desired that the filter 200 can be centered in the vena cava to improve the thrombus capture effect. Herein, the meaning of "centered" refers to the filter 200 being coaxially arranged with the inferior vena cava. Hereinafter, the implant being the filter 200 is taken as an example for description.

[0043] In practice, the auxiliary device 100 is coaxially arranged with the filter 200 and synchronously delivered into the inferior vena cava. Before the filter 200 is fully released, the auxiliary device 100 is radially expanded until the joints between the main body section 120 and the first transition section 110 and between the main body section 120 and the second transition section 130 abut against the inferior vena cava wall, or at least part of the main body section 120 abuts against the inferior vena cava wall, until the auxiliary device 100 is coaxially arranged with the inferior vena cava. At this time, releasing the filter 200 can improve the coaxiality between the filter 200 and the inferior vena cava, so that the filter 200 can be centrally positioned in the inferior vena cava. The specific usage process will be described in detail later.

[0044] Those skilled in the art should understand that when at least part of the main body section 120 is used to abut against the inferior vena cava wall, the outer diameter of at least part of the main body section 120 should be greater than or equal to the maximum outer diameters of the first transition section 110 and the second transition section 120. In a typical embodiment, the main body section 120 includes several cylindrical segments, and the outer diameter of the cylindrical segments can be equal to the maximum outer diameters of the first transition section 110 and the second transition section 120. Such a setting can make the cylindrical segments abut against the inferior vena cava wall, and a surface contact is also formed between the main body section 120 and the blood vessel wall, enhancing the supporting force and stability and improving the reliability. Alternatively, the projection of the outer wall contour 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 inferior vena cava wall after expansion and the auxiliary device 100 is centrally arranged in the inferior vena cava. In addition, it should also be known that to enable the auxiliary device 100 to expand smoothly in the body, preferably the auxiliary device 100 is a self-expanding structure. The self-expanding structure means that the structural member has good resilience itself. When it is subjected to pressure, it deforms, and automatically rebounds to its initial form after the pressure is removed. Generally, the self-expanding structure is made of a shape memory material such as nitinol.

[0045] 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 symmetrically arranged at the axial two ends of the main body section 120. Please refer to Figure 2 and Figure 7, in some 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 less than that of the second transition section 130. During operation, it is preferred that the first transition section 110 is closer to the filter 200. The advantage of such an arrangement is that the axial distance between the auxiliary device 100 and the filter 200 is shortened, which is beneficial to further providing the coaxiality between the filter 200 and the inferior vena cava.

[0046] The present invention does not limit the forming method of the auxiliary device 100. In some embodiments, please refer to Figure 1 and Figure 2 , the first transition section 110, the main body section 120 and the third transition section 130 are formed by braiding wire materials, and the main body section 120 preferably includes one cylindrical section, which is convenient to form. Further, the auxiliary device 100 further 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 body section 120 and binds a free end of the wire material; the second connecting ring 150 is coaxially arranged at one end of the second transition section 130 away from the main body section 120 and binds the other free end of the wire material.

[0047] Please refer specifically to Figure 3 and Figure 4 , when the auxiliary device 100 is in the expanded state, diamond-shaped holes 121 are formed on the main body section 120. The diamond-shaped holes 121 have a first interior angle β and a second interior angle θ. The angle bisector of the first interior angle β is parallel to the axis of the main body section 120, and the angle of the first interior angle β is greater than or equal to the angle of the second interior angle θ. The side length A of the diamond-shaped hole 121, the angles of the interior angles, and the number of wire materials used together affect the anti-extrusion performance (i.e., the support strength) of the auxiliary device 100. Specifically, when the number of wire materials is fixed, the shorter the side length A of the diamond-shaped hole 121 and the larger the first interior 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-shaped hole 121 and the smaller the first interior 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 wire materials and the smaller the first interior angle β, the weaker the anti-extrusion performance and the worse the bending performance of the auxiliary device 100; on the contrary, the fewer the number of wire materials and the larger the first interior angle β, the stronger the anti-extrusion performance and the better the bending performance of the auxiliary device 100. When the first interior angle β is fixed, the more the number of wire materials and the shorter the side length A, the stronger the anti-extrusion performance and the better the bending performance of the auxiliary device 100; the fewer the number of wire materials and the longer the side length A, the weaker the anti-extrusion performance and the worse the bending performance of the auxiliary device 100.

[0048] In practice, the auxiliary device 100 needs to have good anti-extrusion performance and bending performance, and should also have a small radial dimension (referring to the radial dimension of the auxiliary device in the compressed state). Based on this, it is preferred that the number of the wire materials is 10 to 14, the wire diameter of the wire materials is 0.15 mm to 0.4 mm, the side length A of the diamond-shaped hole 121 is 1 mm to 1.5 mm, and the angle of the first inner angle β is 90° to 160°. In addition, it is preferred that the axial length L1 of the main body section 120 (in the case where the main body section 120 includes a cylindrical section) is 30 mm to 50 mm, and the outer diameter Φ1 is 16 mm to 30 mm. It can be understood that the dimensions mentioned in this article all refer to the relevant dimensions of the auxiliary device 100 in the expanded state.

[0049] This braided auxiliary device 100 is relatively soft and can be expanded according to the diameter of the inferior vena cava during expansion, reducing damage to the blood vessel wall. In addition, by reasonably designing the relevant dimensions of the auxiliary device 100, the outer diameter of the auxiliary device 100 during compression can be 1 mm to 2 mm, and it can be compressed into a 6F to 10F sheath for transportation.

[0050] In some other embodiments, please refer to Figures 6 to 8 , the auxiliary device 100 can also be formed by cutting and shaping a pipe. When cutting the pipe, the first connection ring 140 can also be formed at one end of the first transition section 110 away from the main body section 120, and the second connection ring 150 can be formed at one end of the second transition section 130 away from the main body section 120.

[0051] In the auxiliary device 100 formed by cutting and shaping, it is preferred that the minimum outer diameter Φ2 of the auxiliary device 100 (that is, the outer diameters of the first connection ring 140 and the second connection ring 150) is 1 mm to 2.3 mm, the maximum outer diameter Φ3 (that is, the maximum outer diameter of the main body section 120) is 16 mm to 30 mm, and the axial length L2 is 45 mm to 60 mm.

[0052] Furthermore, please refer to Figure 5 and Figure 9, an embodiment of the present invention further provides a transporter 10, including 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 to the filter 200. The transporter is configured such that the conveying device is used to convey the auxiliary device 100 and the filter 200 to a predetermined position in the target lumen, and 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 in the corresponding predetermined position in a predetermined posture.

[0053] The structure of the transporter 10 and its cooperation relationship with the filter 200 will be described below in conjunction with the specific application scenario of the auxiliary device 100.

[0054] In the following text, the terms "distal end" and "proximal end" are defined according to the position relative to the heart after the filter 200 is implanted into the patient. 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" and "proximal" refer to the relative orientation, relative position, and direction of elements or actions relative to each other from the perspective of the operator using the transporter 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 transporter 10 that is close to the operator during normal operation.

[0055] Figure 10 The schematic diagram of conveying the auxiliary device 100 and the filter 200 to the vena cava through the jugular vein is shown. As Figure 10 shown, the auxiliary device 100 is arranged at the proximal end of the filter 200.

[0056] Please refer to Figure 5 and Figure 9 and in conjunction with Figure 10 , in this scenario, the conveying device used includes a tube assembly 310, a post-release assembly, and a handle 330. The tube assembly 310 at least includes an inner tube 311. The distal structure of the post-release assembly is partially connected to the distal end of the inner tube 311 and is arranged coaxially 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 post-release assembly. The auxiliary device 100 is sleeved on the inner tube 311 and can move at least partially along the axial direction of the inner tube 311 to enable the radial expansion or contraction of the auxiliary device 100. The proximal end of the filter 200 is detachably connected to the distal structure of the post-release assembly, and the filter 200 is arranged coaxially with the distal structure of the post-release assembly.

[0057] More specifically, the tube assembly 310 further includes an outer tube 312 which is sleeved outside the inner tube 311 and can move axially along the inner tube 311. The rear release assembly includes a limit sleeve 321, a restraint member (not shown in the figure) and a connecting wire (not shown in the figure). The limit sleeve 321 and the restraint 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 restraint member is movably arranged in the limit sleeve 321, the connecting wire is movably threaded through the inner tube 311, and the distal end of the connecting wire is connected to the restraint member. 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 for driving the inner tube 311 and the outer tube 312 to move axially along 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. The proximal end of the auxiliary device 100 is also fixedly connected to the distal end of the outer tube 312. Thus, when the outer tube 312 moves on the inner tube 311 in the proximal-to-distal direction (i.e., pushing the outer tube 312 into the body), the auxiliary device 100 can expand radially, and when the outer tube 312 moves on the inner tube 311 in the distal-to-proximal direction (i.e., retracting the outer tube 312 out of the body), the auxiliary device 100 can contract radially.

[0058] When the first transition section 110 and the second transition section 130 of the auxiliary device 100 are symmetrically arranged, either end 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 body 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 body section 120 is used as the proximal end of the auxiliary device 100. That is to say, the first connecting ring 140 is fixedly sleeved on the inner tube 311, and the second connecting ring 150 is movably sleeved on the inner tube 311.

[0059] In addition, a first driving part and a second driving part may be provided on the handle 330. The first driving part is used to control the axial movement of the outer tube 312 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 disposed inside the handle 330 and is 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 is 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 an external force and axially move along the handle 330 under the action of the external force, so as to drive the outer tube 312 to axially move relative to the inner tube 311. The second driving part is used to control the axial movement of the inner tube 311 relative to the connecting wire, and its structure is similar to that of the first driving part, which will not be elaborated here.

[0060] The limiting sleeve 321 is located outside the distal end of the auxiliary device 100. A recovery component such as a recovery hook may be provided on the proximal center of the filter 200. The recovery hook is used to extend into the limiting sleeve 321. The limiting sleeve 321 cooperates with the binding member to detachably connect the recovery hook to the rear release assembly. In a non-limiting embodiment, the binding 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 form a limiting space, and the recovery hook is used to be accommodated in the limiting space. When the second slider and the limiting sleeve move relative to each other and the groove is at least partially exposed outside the limiting sleeve and the limiting effect on the recovery hook is released, the connection between the recovery hook and the rear release assembly is released (not shown in the figure).

[0061] The delivery load further includes a sheath tube 350, and the sheath tube 350 is used to movably sleeved outside the tube assembly 310, the auxiliary device 100, and the filter 200. It can be understood that when the sheath tube is sleeved outside the auxiliary device 100 and the filter 200, both the auxiliary device 100 and the filter 200 are in a compressed state.

[0062] 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 .

[0063] 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.

[0064] Figure 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 Figure 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.

[0065] Please refer to Figure 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.

[0066] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art can 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 its equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An auxiliary device for assisting an implant to be positioned in a target cavity in a predetermined posture when the implant is released, characterized in that, The auxiliary device includes a first transition section, a main body section, and a second transition section that are axially connected in sequence. Along the direction away from the main body section, the outer diameters of the first transition section and the second transition section gradually decrease; The auxiliary device is cut from a pipe, and when cutting the pipe, a first connection ring coaxial with the first transition section is formed at one end of the first transition section away from the main body section, and a second connection ring coaxial with the second transition section is formed at one end of the second transition section away from the main body section; the first transition section and the second transition section are mirror-symmetrically arranged at the axial two ends of the main body section, one of the first connection ring and the second connection ring serves as the distal end of the auxiliary device, and the other of the first connection ring and the second connection ring serves as the proximal end of the auxiliary device; alternatively, the axial length of the first transition section is less than the axial length of the second transition section, the first connection ring serves as the distal end of the auxiliary device, and the second connection ring serves as the proximal end of the auxiliary device; the distal end of the auxiliary device is used for fixedly sleeving on the inner tube of the delivery device, and the proximal end of the auxiliary device is used for sleeving on the inner tube and can move axially along the inner tube so that the auxiliary device expands or contracts radially; the outer diameters of the first connection ring and the second connection ring are the minimum outer diameters of the auxiliary device, and the minimum outer diameter of the auxiliary device is 1 mm to 2.3 mm.

2. The auxiliary device according to claim 1, characterized in that, The outer diameter of at least part of the main body section is greater than or equal to the maximum outer diameters of the first transition section and the second transition section.

3. The auxiliary device according to claim 1 or 2, 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.

4. The auxiliary device according to claim 1, wherein The maximum outer diameter of the auxiliary device is 16 mm to 30 mm, and the axial length is 45 mm to 60 mm.

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

6. A conveyor, characterized in that, It includes a delivery device and the auxiliary device according to any one of claims 1-5; the delivery device is movably connected to the auxiliary device for controlling the radial expansion or contraction of the auxiliary device; the delivery device is also used for connecting with an implant; The delivery device is configured to deliver and release the implant to a predetermined position in a target cavity, and when releasing the implant, the delivery device also controls the expansion of the auxiliary device and positions the implant in the corresponding predetermined position in a predetermined posture.

Images