CN113244018A

CN113244018A - Auxiliary device and conveyer

Info

Publication number: CN113244018A
Application number: CN202110625881.6A
Authority: CN
Inventors: 连佰思; 张兆夺; 赵明杰; 许思为; 张昊昀; 王丽文; 袁振宇; 苗铮华
Original assignee: Shanghai Lanmai Medical Technology Co ltd
Current assignee: Shanghai Lanmai Medical Technology Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-08-13
Also published as: CN114521993A; WO2022253020A1; AR126081A1

Abstract

The invention provides an auxiliary device and a conveyor, wherein the conveyor comprises the auxiliary device, the auxiliary device comprises a first transition section, a main body section and a second transition section which are sequentially connected in the axial direction, and the outer diameter of the first transition section and the outer diameter of the second transition section are gradually reduced along the direction far away from the main body section. When the conveyor is used for conveying the implant into the target cavity for release, the auxiliary device can be used for improving the coaxiality of the implant and the target cavity, improving the thrombus capturing effect, improving the curative effect and facilitating recovery.

Description

Auxiliary device and conveyer

Technical Field

The invention relates to the technical field of medical instruments, in particular to an auxiliary device and a conveyor.

Background

Once sloughing off occurs after deep vein thrombosis, the thrombus will flow back along the veins to the heart, and then be pumped from the heart to the pulmonary artery and plug the pulmonary artery to form a pulmonary embolism. Pulmonary embolism is an acute condition with high clinical morbidity and mortality, and is caused by pulmonary artery embolism most of the time. The vena cava filter is a medical device placed in the vena cava and used for capturing thrombus and preventing the thrombus from moving upwards to the heart and the lung so as to prevent pulmonary artery embolism. With the development of clinical technology and manufacturing technology, the performance and implantation mode of the vena cava filter have been greatly developed, but the vena cava filter in the prior art still has the problem that the inclination after release causes that thrombus can not be effectively captured.

Disclosure of Invention

The invention aims to provide an auxiliary device and a conveyor, wherein the auxiliary device can be conveyed into a body together with an implant such as a filter and is used for assisting the implant to be placed in a blood vessel in the middle during the release process of the implant, so that the inclination of the implant is avoided, and the thrombus capture effect is improved.

To achieve the above object, the present invention provides an assisting apparatus for assisting positioning of an implant in a predetermined posture in a target lumen when the implant is released; the auxiliary device comprises a first transition section, a main body section and a second transition section which are sequentially connected in the axial direction, and the outer diameter of the first transition section and the outer diameter of the second transition section are gradually reduced along the direction away from the main body section.

Optionally, an outer diameter of at least a partial region 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.

Optionally, the first transition section and the second transition section are arranged mirror symmetrically at both axial ends of the main body section.

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

Optionally, the auxiliary device further comprises a first connecting ring coaxially connected to an end of the first transition section away from the main body section; and/or the presence of a gas in the gas,

the auxiliary device further comprises a second connecting ring coaxially connected to an end of the second transition section remote from the main section.

Optionally, the first transition section, the main body section and the second transition section are woven from filaments.

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

Optionally, the number of the wires is 10-14, the side length of each diamond hole is 1-1.5 mm, and the angle of each first inner angle is 90-160 degrees; and/or the wire diameter of the wire is 0.15 mm-0.4 mm.

Optionally, the main body section has an outer diameter of 16mm to 30mm and an axial length of 30mm to 50 mm.

Optionally, the auxiliary device is cut from tubing.

Optionally, the auxiliary device has a minimum outer diameter of 1mm to 2.3mm, a maximum outer diameter of 16mm to 30mm, and an axial length of 45mm to 60 mm.

Optionally, the auxiliary device is of a self-expanding construction.

To achieve the above object, the present invention also 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 with the auxiliary device and is used for controlling the auxiliary device to radially expand or contract; the delivery device is also used for connecting with the implant;

the transporter is configured as a predetermined position of the delivery device for delivering the implant and the auxiliary device to a target lumen, the delivery device is further for releasing the implant, and the delivery device further controls the auxiliary device to expand and position the implant at a predetermined position in a predetermined posture when the implant is released.

Compared with the prior art, the auxiliary device and the conveyor have the following advantages:

the conveyor comprises the auxiliary device, the auxiliary device comprises a first transition section, a main body section and a second transition section which are sequentially connected in the axial direction, and the outer diameter of the first transition section and the outer diameter of the second transition section are gradually reduced along the direction far away from the main body section. When the conveyor is used for conveying the implant into the target cavity for release, the auxiliary device can be used for improving the coaxiality of the implant and the target cavity, so that the thrombus capturing effect is improved, the recovery is convenient, and the curative effect is improved.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic diagram of an auxiliary device according to an embodiment of the present invention, wherein a first transition section and a second transition section are arranged in mirror symmetry;

FIG. 2 is a schematic structural view of an auxiliary device provided in accordance with an embodiment of the present invention, illustrating that the axial length of the first transition section is smaller than the axial length of the second transition section;

FIG. 3 is a schematic structural diagram of a main body segment of the auxiliary device according to an embodiment of the present invention;

FIG. 4 is an enlarged partial schematic view of a main body segment of the assist device in accordance with one embodiment of the present invention;

FIG. 5 is a schematic diagram of a conveyor according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of an auxiliary device according to another embodiment of the present invention, wherein a first transition section and a second transition section are arranged in mirror symmetry;

FIG. 7 is a schematic structural view of an auxiliary device provided in accordance with another embodiment of the present invention, illustrating that the axial length of the first transition section is smaller than the axial length of the second transition section;

FIG. 8 is a dimensional schematic of the auxiliary structure shown in FIG. 7;

FIG. 9 is a schematic diagram of a conveyor according to another embodiment of the present invention;

FIG. 10 is a schematic view of a use scenario of the accessory device provided in an embodiment of the present invention, in which the accessory device and the filter are delivered from the jugular vein to the vena cava, and the accessory device is located at the proximal end of the filter;

fig. 11 is a view of a use scenario of an accessory device provided by an embodiment of the present invention, wherein the accessory device and filter are delivered from a femoral vein to a vena cava, and the accessory device is located at a distal end of the filter.

[ reference numerals are described below ]:

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

200-filter, 210-filter rod;

310-pipe assembly, 311-inner pipe, 312-outer pipe, 321-limiting sleeve, 330-handle, 341-driving button, 342-sliding block, 343-sliding groove and 350-sheath pipe;

10-conveyor.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.

Fig. 1, fig. 2, fig. 6 and fig. 7 are schematic structural diagrams illustrating an auxiliary device 100 according to an embodiment of the present invention. Referring to fig. 1, 2, 6 and 7, the auxiliary device 100 includes a first transition section 110, a main body section 120 and a second transition section 130 connected in sequence in an axial direction, and an outer diameter of the first transition section 110 and an outer diameter of the second transition section 130 are gradually reduced along a direction away from the main body section 120. The aid 100 is for delivery to a patient simultaneously with an implant and assists in positioning the implant in a predetermined pose in a target lumen upon release of the implant. Optionally, the implant is a filter 200 (as labeled in fig. 10 and 11). Generally, the filter 200 is used to release into the inferior vena cava (i.e., the previously described target lumen) to capture thrombus and prevent it from entering the heart and thus the pulmonary artery to initiate pulmonary embolism. In practice, it is desirable that the filter 200 be centrally located within the vena cava to enhance thrombus capture when the filter 200 is implanted in the inferior vena cava, where "centrally" means that the filter 200 is disposed coaxially with the inferior vena cava. Hereinafter, the implant is exemplified as the filter 200.

In practice, the aid 100 is placed coaxially with the filter 200 and delivered simultaneously into the inferior vena cava, and the aid 100 is radially expanded until the filter 200 is fully released, until the main body segment 120 abuts the first transition segment 110 and the main body segment 120 abuts the second transition segment 130 against the wall of the inferior vena cava, or until the aid 100 is placed coaxially with the inferior vena cava, whereupon completion of the release of the filter 200 increases the coaxiality of the filter 200 with the inferior vena cava, such that the filter 200 is centrally positioned within the inferior vena cava. The specific process of use will be described in detail later.

It will be appreciated by those skilled in the art that the outer diameter of at least a partial region of the body section 120 should be greater than or equal to the maximum outer diameter of the first and

second transition sections

110, 120 when the body section 120 is at least partially used against the inferior vena cava wall. In a typical embodiment, the main body section 120 includes a plurality of cylindrical sections, the outer diameter of the cylindrical sections may be equal to the maximum outer diameter of the first transition section 110 and the second transition section 120, so that the cylindrical sections abut against the wall of the inferior vena cava, and the main body section 120 further forms a surface contact with the wall of the blood vessel, thereby enhancing the supporting force and stability and improving the reliability. Alternatively, the projection of the contour of the outer wall of the main body segment 120 onto a plane parallel to the axis of the main body segment may also be curved, as long as the main body segment 120 is able to at least partially rest against the wall of the inferior vena cava after expansion and to center the assisted device 100 in the inferior vena cava. Further, it should be understood that, in order to make the auxiliary device 100 smoothly expand in the body, it is preferable that the auxiliary device 100 has a self-expanding structure, which means that the structural member itself has good resilience, is deformed when it is subjected to pressure, and automatically rebounds to an original form after the pressure is removed. Typically, the self-expanding structure is fabricated from a shape memory material such as nickel titanium.

With continued reference to fig. 1 and 6, in some embodiments, the first transition section 110 and the second transition section 130 are disposed at two axial ends of the main body section 120 in a mirror symmetry manner. Referring to fig. 2 and 7 again, 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. In operation, it is preferred that the first transition section 110 be located closer to the filter 200, which advantageously reduces the axial distance between the accessory device 100 and the filter 200, thereby further providing concentricity of the filter 200 with the inferior vena cava.

The present invention does not limit the molding method of the auxiliary device 100. In some embodiments, referring to fig. 1 and 2, the first transition section 110, the main body section 120 and the third transition section 130 are woven by using silk material, and the main body section 120 preferably comprises one cylindrical section, so that the forming is convenient. Further, the auxiliary device 100 further includes a first connection ring 140 and a second connection ring 150. Wherein the first connecting ring 140 is coaxially disposed at an end of the first transition section 110 distal from the main section 120 and traps a free end of the wire; the second connecting ring 150 is coaxially disposed at one end of the second transition section 130 remote from the main section 120 and traps the other free end of the wire.

Referring to fig. 3 and 4, when the auxiliary device 100 is in the expanded state, the diamond-shaped hole 121 is formed on the main body segment 120, and the diamond-shaped hole 121 has a first interior angle β and a second interior angle θ, wherein a bisector of the first interior angle β is parallel to the axis of the main body segment 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 holes 121, the angle of the inner corners, and the number of wires used together affect the crush resistance (i.e., the support strength) of the auxiliary device 100. Specifically, when the number of wires is fixed, the shorter the side length a of the diamond-shaped hole 121 is, the larger the first interior angle β is, the stronger the anti-extrusion performance of the auxiliary device 100 is, and the better the bending performance is; conversely, the longer the side length A of the diamond-shaped holes 121, the smaller the first inner angle β, the weaker the anti-crush performance of the auxiliary device 100, and the poorer the bending performance. When the side length A is fixed, the larger the number of the wires is, the smaller the first interior angle beta is, the weaker the anti-extrusion performance of the auxiliary device 100 is, and the worse the bending performance is; conversely, the smaller the number of wires and the larger the first internal 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 larger the number of the wires and the shorter the side length a are, the stronger the anti-extrusion performance of the auxiliary device 100 and the better the bending performance are; the smaller the number of the wires and the longer the side length A, the weaker the anti-extrusion performance and the worse the bending performance of the auxiliary device 100.

In practice, the auxiliary device 100 is required to have good resistance to crushing and bending, 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 preferable that the number of the wire materials is 10 to 14, the diameter of the wire material is 0.15 to 0.4mm, the side length A of the diamond-shaped hole 121 is 1 to 1.5mm, and the angle of the first interior angle β is 90 to 160 °. Furthermore, it is preferred that the axial length L of the body segment 120 (as would be the case if the body segment 120 comprised one cylindrical segment) is₁30 mm-50 mm, outer diameter phi₁Is 16 mm-30 mm. It is understood that all references to dimensions herein refer to the relevant dimensions of the accessory device 100 in the expanded state.

The woven assist device 100 is flexible and can be expanded according to the diameter of the inferior vena cava during expansion, thereby reducing damage to the vessel wall. In addition, by reasonably designing the relevant size of the auxiliary device 100, the outer diameter of the auxiliary device 100 can be 1 mm-2 mm when being compressed, and the auxiliary device can be compressed in a sheath tube of 6F-10F for conveying.

In other embodiments, referring to fig. 6 to 8, the auxiliary device 100 may also be formed by cutting and shaping a tube, and when cutting the tube, the first connecting ring 140 may also be formed at an end of the first transition section 110 away from the main body section 120, and the second connecting ring 150 may also be formed at an end of the second transition section 130 away from the main body section 120.

In the cut-and-form auxiliary device 100, it is preferable that the minimum outer diameter Φ of the auxiliary device 100 is₂(i.e., the outer diameter of the first connection ring 140 and the outer diameter of the second connection ring 150) is 1mm to 2.3mm, and the maximum outer diameter Φ₃(i.e., the maximum outer diameter of the main body segment 120) is 16mm to 30mm, and the axial length L₂45 mm-60 mm.

Further, referring to fig. 5 and fig. 9, an embodiment of the present invention further provides a conveyor 10, which includes a conveying device and the auxiliary device 100 as described above. The delivery device is movably coupled to the supplemental device 100 and controls the supplemental device 100 to radially expand or contract. The delivery device is also used in conjunction with the filter 200. The transporter is configured as the transporting means for transporting the auxiliary device 100 and the filter 200 to a predetermined position of a target lumen, the transporting means is further for releasing the filter 200, and the transporting means further controls the auxiliary device 100 to radially expand and position the filter 200 at a predetermined posture at a corresponding predetermined position when the filter 200 is released.

The structure of the conveyor 10 and its cooperation with the filter 200 will be described below with reference to a specific application scenario of the auxiliary device 100.

Hereinafter, the terms "distal" and "proximal" are defined with respect to the position of filter 200 relative to the heart after implantation in a patient, "distal" refers to the end of filter 200 that is farther from the heart, and "proximal" refers to the end of 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 with respect to one another from the perspective of an operator using the delivery device 10, with "distal" generally referring to the end that is first introduced into a patient and "proximal" generally referring to the end of the delivery device 10 that is closer to the operator during normal operation.

Fig. 10 shows a schematic view of the auxiliary device 100 and the filter 200 delivered to the vena cava via the jugular vein. As shown in fig. 10, the accessory device 100 is disposed at the proximal end of the filter 200.

With reference to fig. 5 and 9 in combination with fig. 10, the delivery device used in this scenario includes a tube assembly 310, a rear release assembly and a handle 330, wherein the tube assembly 310 includes at least an inner tube 311, and a distal structure of the rear release assembly is partially connected to a 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 move at least partially along the axial direction of the inner tube 311 to radially expand or contract the auxiliary device 100. 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 disposed with the distal structure of the rear release assembly.

In more detail, the pipe assembly 310 further includes an outer pipe 312, and the outer pipe 312 is sleeved outside the inner pipe 311 and can move along the axial direction of the inner pipe 311. The rear release assembly comprises a limiting sleeve 321, a binding piece (not shown in the figure) and a connecting wire (not shown in the figure), the limiting sleeve 321 and the binding piece form the distal end structure, wherein the limiting sleeve 321 is fixedly connected to the distal end of the inner tube 311 and is communicated with the inner tube 311; the binding piece is movably arranged in the limiting sleeve 321, the connecting wire is movably arranged in the inner tube 311 in a penetrating mode, the far end of the connecting wire is connected with the binding piece, and the near end of the connecting wire is the near 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 for driving 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, the proximal end of the auxiliary device 100 is sleeved on the inner tube 311 and can move along the axial direction of 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 in the proximal-to-distal direction (i.e., the outer tube 312 is pushed in the direction of the body), the auxiliary device 100 can radially expand, and when the outer tube 312 moves on the inner tube 311 in the distal-to-proximal direction (i.e., the outer tube 312 is retracted in the direction of the body), the auxiliary device 100 can radially contract.

When the first transition section 110 and the second transition section 130 of the auxiliary device 100 are symmetrically arranged, either 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 segment 110 of the auxiliary device 100 is smaller than the axial length of the second transition segment 130, the end of the first transition segment 110 away from the main body segment 120 serves as the distal end of the auxiliary device 100, and the end of the second transition segment 130 away from the main body segment 120 serves as the proximal end of the auxiliary device 100. That is, the first connection ring 140 is fixedly fitted over the inner tube 311, and the second connection ring 150 is movably fitted over the inner tube 311.

In addition, the handle 330 may be provided with a first driving part and a second driving part. The first driving part is used for controlling the outer tube 312 to move axially 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 within the handle 330 and is coupled to the proximal end of the outer tube 312. A portion of the driving button 341 is located inside the sliding groove 343 and connected to the first slider 342, and another portion of the driving button 341 is exposed outside the sliding groove 343 and is configured to receive an 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 move axially relative to the inner tube 311. The second driving portion is used for controlling the inner tube 311 to move axially relative to the connecting wire, and the structure of the second driving portion is similar to that of the first driving portion, which is not described herein again.

The stop collar 321 is located outside the distal end of the auxiliary device 100, and the proximal end of the filter 200 may be provided with a recovery member such as a recovery hook for extending into the stop collar 321, the stop collar 321 and the tether cooperating with each other to detachably connect the recovery hook to the rear release assembly. In a non-limiting embodiment, the constraint piece includes a second sliding block, a groove is formed on the second sliding block, the groove and the inner wall of the limiting sleeve together form a limiting space, and the recovery hook is used for being accommodated in the limiting space. When the second sliding block and the limiting sleeve move relatively, the groove is at least partially exposed out of the limiting sleeve, and the limiting effect on the recovery hook is released, the recovery hook and the rear release assembly are disconnected (not shown in the figure).

The delivery cartridge further comprises a sheath 350, the sheath 350 adapted to be removably fitted over the tube assembly 310, the accessory device 100, and the filter 200. It can be understood that when the sheath is sleeved outside the auxiliary device 100 and the filter 200, the auxiliary device 100 and the filter 200 are both in a compressed state.

After the auxiliary device 100, the filter 200, and the delivery device are assembled, the auxiliary device 100 and the filter 200 are delivered to a predetermined position of the inferior vena cava by using the delivery device, and then the sheath 350 is withdrawn to expose the filter 200, and it is known that the release is completed after the exposure of the filter 200 (i.e., the expansion of the filtering portion of the filter 200). The sheath 350 is then continuously 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 being adjusted according to the diameter at the predetermined position of the inferior vena cava to adjust the degree of expansion of the auxiliary device 100 such that the main body segment 120 of the auxiliary device 100 supports the vessel wall at the predetermined position at which the auxiliary device 100 is disposed coaxially with the vessel such that the filter 200 is also disposed substantially coaxially with the vessel. The inner tube 311 is then withdrawn to release the post-release assembly from the retrieval hook of the strainer 200, completing the post-release of the strainer 200.

The process of withdrawing the transporter (i.e., the delivery device and the auxiliary device 100) out of the body is as follows: the wire pushes the inner tube 311 forward and retracts the binding element into the stop collar 321, then retracts the outer tube 312 and puts the auxiliary device 100 in a compressed state, then pushes the sheath 350 forward and retracts the auxiliary device 100 and the stop collar 321 into the sheath 350, and finally withdraws the conveyor as a whole out of the body.

Fig. 11 shows a schematic view of the delivery of the accessory device 100 and the filter 200 to a predetermined location along the femoral vein to the vena cava. The auxiliary device 100 is shown on the distal side of the filter 200, in the same configuration as the filter 200 shown in FIG. 10, but the distal end of the filter 200 is detachably connected to the rear release assembly.

Referring to fig. 11, the filter 200 is substantially in a conical structure and includes a plurality of filter rods 210, and the distal end of each filter rod 210 is closed and connected to the recycling unit; at least a portion of the filter rods 210 are formed with a positioning member, such as a hook (not shown), at the distal end thereof, and when the filter 200 is connected to the transporter, at least a portion of the positioning member of the filter rods 210 is received in the limiting space (taking as an example the structure of the restraining member and the limiting sleeve 321 forming the limiting space and the limiting space receiving the filter 200), so as to achieve the detachable connection of the filter 200 and the rear release assembly.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such 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 such modifications and variations.

Claims

1. An assisting apparatus for assisting positioning of an implant in a predetermined posture in a target lumen when releasing the implant, comprising a first transition section, a main body section and a second transition section which are axially connected in series, an outer diameter of the first transition section and an outer diameter of the second transition section being gradually reduced in a direction away from the main body section.

2. The supplemental device of claim 1, wherein an outer diameter of at least a partial region of the main body segment is greater than or equal to a maximum outer diameter of the first and second transition segments.

3. The supplemental device of claim 1, wherein the first transition section and the second transition section are arranged mirror-symmetrically at axial ends of the main body section.

4. The supplemental device of claim 1, wherein an axial length of the first transition section is less than an axial length of the second transition section.

5. The supplemental device of any of claims 1-4, further comprising a first connecting ring coaxially connected to an end of the first transition section distal from the main body section; and/or the presence of a gas in the gas,

6. The assistive device of claim 1, wherein the first transition section, the main body section, and the second transition section are woven from a wire material.

7. The assistive device of claim 6, wherein the body segment is formed with diamond-shaped holes having a first interior angle and a second interior angle, a bisector of the first interior angle being parallel to the axis of the body segment; the angle of the first interior angle is greater than or equal to the angle of the second interior angle when the assistive device is in an expanded state.

8. The auxiliary device as claimed in claim 7, wherein the number of the wires is 10-14, the side length of the diamond-shaped hole is 1-1.5 mm, and the angle of the first inner angle is 90-160 °; and/or the wire diameter of the wire is 0.15 mm-0.4 mm.

9. The supplemental device of claim 1 or 2, wherein the main body segment has an outer diameter of 16mm to 30mm and an axial length of 30mm to 50 mm.

10. The accessory of claim 1, wherein the accessory is cut from tubing.

11. The supplemental device of claim 10, wherein the supplemental device has a minimum outer diameter of 1mm to 2.3mm, a maximum outer diameter of 16mm to 30mm, and an axial length of 45mm to 60 mm.

12. The accessory of claim 1, wherein the accessory is a self-expanding structure.

13. A conveyor, characterized by comprising a conveying device and an auxiliary device according to any one of claims 1-12; the conveying device is movably connected with the auxiliary device and is used for controlling the auxiliary device to radially expand or contract; the delivery device is also used for connecting with the implant;

the transporter is configured for transporting and releasing the implant to a predetermined position of a target lumen, and the transport device further controls the auxiliary device to expand and position the implant at the corresponding predetermined position in a predetermined posture when the implant is released.