Thrombus filtering device and conveying device thereof

Abstract

The invention relates to the technical field of medical instruments, and provides a thrombus filtering device and a conveying device.The thrombus filtering device comprises a supporting frame which can be intervened into a blood vessel and allows blood to pass through, and the supporting frame has a contracted state and an expanded state; the supporting frame comprises an abutting part which is located at the far end of the supporting frame and can abut against the blood vessel wall in the expansion state, and a connecting part which is located at the near end and can be connected with an anchor part. The abutting part is in a cambered surface shape with multiple holes. According to the technical scheme, thrombus and other large-particle substances in blood flow can be filtered, normal blood flow can be guaranteed, the occupied aorta space is small, and the operation convenience of an operation is improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a thrombus filtering device and a delivery device thereof. Background Art

[0002] The current brain protection device is an elastic metal skeleton attached with a polymer membrane or a textile mesh, which is used to block the three branch blood vessels of the aortic arch, as disclosed in the Chinese patent application number CN201880000296.3. Covering the three branch blood vessels of the aortic arch requires a larger filter membrane or mesh structure. However, the above-mentioned brain protection device is placed in the aortic arch for stable anchoring and needs to cover a larger area, which limits the operating space during surgery and requires more accurate positioning. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a thrombus filtering device and a conveying device thereof, which can filter larger particles of substances such as thrombi in the blood flow, and can also ensure normal blood flow, and occupy less space in the aorta, while improving the convenience of surgical operation.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] In a first aspect, the present application provides a thrombus filtering device, comprising a support frame that can be inserted into a blood vessel and allows blood to pass through, the support frame having a contracted state and an expanded state, the support frame comprising an abutment portion located at the distal end of the support frame that can abut against the blood vessel wall in the expanded state, and a connection portion located at the proximal end that can be connected to an anchor portion; the abutment portion is a porous arc surface.

[0006] In the process of implementing the above technical solution, the thrombus filtering device includes a support frame, which can be inserted into the blood vessel and can allow blood to pass through, thereby ensuring the normal passage of blood during surgery; the support frame can shrink and expand to facilitate transportation and positioning in the blood vessel, and the support frame includes an abutment portion arranged at the distal end. When the support frame is in an expanded state, the abutment portion can abut against the blood vessel wall, thereby achieving preliminary positioning of the support frame in the blood vessel. Since the abutment portion is a porous arc-shaped portion, its contact with the blood vessel wall does not require specific positioning, as long as any part of the arc surface abuts against the blood vessel wall. Therefore, when the support frame is released, its angle adjustment is reduced, thereby improving the convenience of surgical operation.

[0007] As an embodiment, the support frame includes an anchor portion, and the anchor portion includes at least one occluding disk, and the occluding disk can be attached to the inner side or the outer side of the blood vessel wall.

[0008] In the process of implementing the above technical solution, the support frame includes an anchor portion located at the proximal end, which can be anchored in the blood vessel when the support frame is in an expanded state, thereby improving the accuracy of positioning the thrombus filtering device in the blood vessel and also improving the stability between the support frame and the blood vessel; the anchor portion includes at least one occluding disk, which can be attached to the inner side or outer side of the blood vessel wall, thereby playing a role in blocking blood and stopping bleeding; in addition, the occluding disk is arranged in a disk-shaped structure, which also facilitates the contraction of the anchor portion.

[0009] As an embodiment, the anchor portion includes two occluding disks, which are respectively configured as a first occluding disk and a second occluding disk for adhering to the inner and outer sides of the blood vessel wall, and the first occluding disk and the second occluding disk are connected to each other.

[0010] In the process of implementing the above technical solution, the anchor part includes two occluding disks, which are respectively configured as a first occluding disk and a second occluding disk for adhering to the inner and outer sides of the blood vessel wall. The first occluding disk and the second occluding disk are connected to each other, so that both the inner and outer walls of the blood vessel puncture position can be blocked, thereby playing a role in hemostasis.

[0011] As an embodiment, the radial dimension of the first occluding disk is smaller than that of the second occluding disk.

[0012] In the process of implementing the above technical solution, the radial dimension of the first occluding disk is smaller than the radial dimension of the second occluding disk. Since blood flows out from the blood vessel, the radial dimension of the second occluding disk located on the outer wall of the blood vessel is larger than the first occluding disk, which can increase the occluding area of ​​the second occluding disk, thereby further improving the occluding effect of the anchor part.

[0013] As an embodiment, the first occluding disc and the second occluding disc are connected via a connecting segment, and the connecting segment can pass through the puncture hole on the blood vessel wall.

[0014] In the process of implementing the above technical solution, the first occluding disk and the second occluding disk are connected by a connecting section, and the connecting section can pass through the puncture hole on the blood vessel wall, so that the first occluding disk and the second occluding disk are respectively located on the inner and outer sides of the blood vessel wall, thereby clamping the blood vessel wall.

[0015] As an implementation manner, the anchor portion is a mesh structure.

[0016] In the process of implementing the above technical solution, the anchor part is a mesh structure, which, on the one hand, makes it easier to block the puncture hole on the blood vessel wall; on the other hand, it is also convenient for the expansion and contraction of the anchor part.

[0017] As an embodiment, the support frame is spherical.

[0018] In the process of implementing the above technical solution, the support frame is a spherical structure. Since the spherical structure is an axisymmetric structure, the support frame does not need to be adjusted in angle during placement, and it can ensure that the stent is stably anchored in the lumen of the blood vessel when released at any angle. Therefore, the above device does not require the assistance of imaging technology such as X-ray or ultrasound during placement, and can achieve blind release.

[0019] As an implementation manner, the anchor portion and the support frame are both elastic members.

[0020] In the process of implementing the above technical solution, the anchor part and the support frame are designed as elastic parts. The structure is in a contracted state when constrained by the sheath tube, and is in an expanded spherical state under the elastic force of the structure after losing the constraint. At the same time, the support frame is a spherical structure, and the top of the anchor is disc-shaped, which can meet the characteristics of a small diameter in the contracted state and expansion along the diameter in the expanded state. The placement process does not require positioning and adjustment, and the operation is simple.

[0021] As an embodiment, the support frame is a spherical structure woven from at least one metal wire, and the metal wires are cross-connected at the distal end to form the anchoring portion.

[0022] In the process of implementing the above technical solution, the support frame is a spherical structure woven from at least one metal wire, which is easy to deform for transportation through a transportation device, and when transported to a predetermined position, the metal wire can quickly restore its original shape, thereby improving the reliability of the thrombus filtering device at the blood vessel puncture position; in addition, the metal wires are cross-connected at the distal end to form an anchor portion, which, on the one hand, can enable the blood to flow normally and reduce obstruction to the blood; on the other hand, it also increases the contact area between the anchor portion and the blood vessel wall, thereby improving the stability between the thrombus filtering device and the blood vessel wall.

[0023] As an embodiment, at least one filter element for filtering blood clots is also provided in the support frame.

[0024] In the process of implementing the above technical solution, at least one filter element is provided in the support frame, and the filter element has the function of filtering large particle emboli and ensuring the normal passage of blood flow.

[0025] In a second aspect, the present application provides a delivery device for a thrombus filtering device, comprising the thrombus filtering device provided in the first aspect; a sheath tube for accommodating the thrombus filtering device, and a push rod for pushing the thrombus filtering device.

[0026] In the process of implementing the above technical solution, the thrombus filtering device can be accommodated in the sheath, and the delivery device also includes a push rod capable of pushing the thrombus filtering device, so that the thrombus filtering device can be pushed into the blood vessel.

[0027] As an embodiment, it includes a support member connected to the proximal end of the sheath tube, the push rod can move in the support member, and the distal end of the push rod can contact the thrombus filtering device.

[0028] In the process of implementing the above technical solution, the delivery device also includes a support member connected to the proximal end of the sheath tube, and the push rod can move in the support member. The support member can guide the push rod, so that the push rod can push the thrombus filtering device into the blood vessel, so that the distal end of the push rod contacts the thrombus filtering device, thereby pushing the blood vessel filtering device from the sheath tube into the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a thrombus filtering device provided in an embodiment of the present application;

[0031] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure in;

[0032] Figure 3 A schematic diagram of the assembly structure of the thrombus filtering device and the sheath provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a conveying device provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the structure of the intervention process of the thrombus filtering device provided in an embodiment of the present application;

[0035] Figure 6 A structural schematic diagram of the intervention process of the thrombus filtering device provided in an embodiment of the present application.

[0036] Icons: 1-support frame; 2-filter element; 4-anchor portion; 41-first occluding disk; 42-second occluding disk; 43-connecting section; 5-abutment portion; 6-sheath; 7-support element; 8-push rod; 9-connecting portion. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of this application, the term "distal end" refers to the end of the components in the delivery device close to the heart tissue, and the "proximal end" refers to the end of the delivery device close to the operator. The terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] On the first aspect, an embodiment of the present application provides a thrombus filtering device, which can filter larger particles such as thrombi in the arterial blood flow through extracorporeal intervention, while ensuring that the normal blood flow volume is small. After being placed in the blood vessel position, the area of ​​the aortic arch occupied by the thrombus filtering device is very small, thereby reducing the difficulty of surgical operation.

[0040] like Figure 1 As shown, the thrombus filtering device includes a support frame 1, which can be inserted into the blood vessel to ensure the normal passage of blood during surgery; the support frame 1 can shrink and expand to facilitate transportation and positioning in the blood vessel, and the support frame 1 includes an abutment portion 5 arranged at the distal end, and the support frame 1 is inserted into the blood vessel, that is, it is in an expanded state. In the expanded state, the abutment portion 5 can abut against the blood vessel wall, thereby achieving preliminary positioning of the support frame 1 in the blood vessel. Since the abutment portion 5 is a porous arc-shaped portion, its contact with the blood vessel wall does not require specific positioning, as long as any part of the arc surface abuts against the blood vessel wall, so when the support frame 1 is released, its angle adjustment is reduced, thereby improving the convenience of surgical operation.

[0041] The porous structure also facilitates blood flow and reduces obstruction to blood.

[0042] Optionally, the support frame 1 includes a spherical support body. In some cases, a connecting portion 9 may or may not be provided at the proximal end of the support body, that is, the anchor portion 4 and the support body are an integrally formed structure and may be woven by metal wire.

[0043] Optionally, the support frame 1 has a hollow structure to reduce obstruction to blood. The support body includes a plurality of arc-shaped support parts. The plurality of support parts can be formed by at least one metal wire. The plurality of support parts can be cross-connected to each other, so that a plurality of holes of different sizes and shapes are formed on the surface of the support frame 1 to facilitate the passage of blood.

[0044] Optionally, the support frame 1 can be inserted into the blood vessel through extracorporeal intervention.

[0045] Optionally, the support frame 1 is made of a material with elastic characteristics, such as nickel-titanium alloy, and its structure can meet the characteristics of a smaller diameter in a contracted state and an expanded diameter in an expanded state.

[0046] Optionally, the radial dimension of the support body is larger than the radial dimension of the blood vessel, so that the support frame 1 is in a compressed state, and under the action of its own elastic force, the support frame 1 can abut against the blood vessel wall after expanding in the blood vessel.

[0047] Optionally, the multiple holes of the abutting portion 5 may be formed by a woven mesh structure, which can increase the contact area with the blood vessel wall, improve stability, and also enable normal blood flow.

[0048] like Figure 2 As shown, optionally, the support frame 1 includes an anchor portion 4 located at the proximal end, and the anchor portion 4 and the support frame 1 can be connected via a connecting portion 9. Of course, in some cases, the support body can also be directly connected to the anchor portion 4 to reduce the production process during the manufacture of the thrombus filtering device.

[0049] like Figure 1 As shown, as an embodiment, the support frame includes an anchor portion 4 located at the proximal end, the anchor portion 4 is connected to the support body, and the anchor portion 4 can be anchored in the blood vessel when the support frame 1 is in an expanded state, thereby improving the accuracy of positioning the thrombus filtering device in the blood vessel and also improving the stability between the support frame and the blood vessel; the anchor portion 4 and the abutment portion 5 cooperate with each other to improve the stability between the support frame 1 and the blood vessel, and a connecting portion 9 can also be provided at the proximal end of the support frame 1, and the connecting portion 9 can be connected to the anchor portion 4, so as to realize the connection between the anchor portion 4 and the support body; the anchor portion 4 includes at least one occluding disk, which can be attached to the inner side or outer side of the blood vessel wall, so as to play a role in blocking blood and stopping bleeding in the puncture hole of the blood vessel; in addition, the occluding disk is arranged in a disk-shaped structure, which also facilitates the contraction of the anchor portion 4.

[0050] Optionally, the thrombus filtering device of the embodiment of the present application can be delivered and positioned in the ascending aorta. In this case, the intervention of the heart valve usually selects the channel outside the ascending aorta as the intervention channel. In other embodiments, the thrombus filtering device of the present application can also be positioned in other blood vessels that need to be filtered. Therefore, the thrombus filtering device of the embodiment of the present application is widely applicable.

[0051] Optionally, the anchor portion 4 is made of a material having elastic characteristics, such as nickel-titanium alloy, and its structure can satisfy the characteristics of having a smaller diameter in a contracted state and an expanded diameter in an expanded state.

[0052] Optionally, the anchor portion 4 may be connected to the supporting body via a metal ring, which may be achieved by welding or gluing; the anchor portion 4 and the supporting body may also be integrally formed.

[0053] like Figure 1 and 2 As shown, as an embodiment, the anchor portion 4 includes two occluding disks, which are respectively configured as a first occluding disk 41 and a second occluding disk 42 for adhering to the inner and outer sides of the blood vessel wall. The first occluding disk 41 and the second occluding disk 42 are connected to each other, so that both the inner and outer walls of the blood vessel puncture position can be blocked, thereby achieving a hemostatic effect.

[0054] Optionally, the first sealing disk 41 and the second sealing disk 42 may be woven from one metal wire or two metal wires, and the connection positions may be welded or glued.

[0055] Optionally, the first sealing disk 41, the second sealing disk 42 and the supporting body may also be woven by a metal wire.

[0056] Optionally, the areas of the first sealing disk 41 and the second sealing disk 42 may be the same.

[0057] As an implementation mode, the radial dimension of the first occluding disk 41 is smaller than the radial dimension of the second occluding disk 42. Since blood flows out from the blood vessel, the radial dimension of the second occluding disk 42 located on the outer wall of the blood vessel is larger than the first occluding disk 41, which can increase the occluding area of ​​the second occluding disk 42, thereby further improving the occluding effect of the anchor part 4.

[0058] like Figure 2 As shown, as an embodiment, the first occluding disk 41 and the second occluding disk 42 are connected by a connecting section 43, and the connecting section 43 can pass through the puncture hole on the blood vessel wall, so that the first occluding disk 41 and the second occluding disk 42 are respectively located on the inner and outer sides of the blood vessel wall, thereby clamping the blood vessel wall.

[0059] Optionally, the connecting section 43 and the first sealing disk 41 and the second sealing disk 42 may be woven together by a metal wire.

[0060] Optionally, the length of the connecting section 43 may be smaller than the thickness of the blood vessel wall, so that the first occluding disk 41 and the second occluding disk 42 can be respectively attached to the inner side and the outer side of the blood vessel wall, thereby clamping the blood vessel wall.

[0061] As an implementation mode, the anchoring nail part 4 is a mesh structure, which can more easily block the puncture hole on the blood vessel wall on the one hand; on the other hand, it can also facilitate the expansion and contraction of the anchoring nail part 4.

[0062] As an implementation method, the support frame 1 is a spherical structure. Since the spherical structure is an axisymmetric structure, the support frame 1 does not need to be adjusted in angle during placement, and the stent can be stably anchored in the lumen of the blood vessel at any angle. Therefore, the above device does not require the assistance of imaging techniques such as X-rays or ultrasound during placement, and can achieve blind release.

[0063] Optionally, the supporting body of the supporting frame 1 is a spherical structure.

[0064] As an implementation method, the anchor part 4 and the support frame 1 are both designed as elastic parts. The structure is in a contracted state when constrained by the sheath tube 6, and is in an expanded spherical state under the elastic force of the structure after losing the constraint. At the same time, the support frame 1 is a spherical structure, and the top of the anchor is disc-shaped, which can meet the characteristics of a small diameter in the contracted state and expansion along the diameter in the expanded state. The placement process does not require positioning and adjustment, and the operation is simple.

[0065] like Figure 2 As shown, the anchor portion 4 may also be connected to the support body via a connecting portion 9, which may increase the stability between the anchor portion 4 and the support body.

[0066] As an embodiment, the support frame 1 is a spherical structure woven from at least one metal wire, which is easy to deform for transportation through a transportation device, and when transported to a predetermined position, the metal wire can quickly restore its original shape, thereby improving the reliability of the thrombus filtering device at the blood vessel puncture position; in addition, the metal wire is cross-connected at the distal end to form an anchor portion 4, which, on the one hand, can enable the blood to flow normally and reduce obstruction to the blood; on the other hand, it also increases the contact area between the anchor portion 4 and the blood vessel wall, thereby improving the stability between the thrombus filtering device and the blood vessel wall.

[0067] like Figure 1 and 2 As shown, as an embodiment, at least one filter element 2 is provided in the support frame 1, and the filter element 2 is capable of filtering large particle emboli while ensuring the normal passage of blood.

[0068] Optionally, multiple filter elements 2 can be provided, and the multiple filter elements 2 can be cross-arranged, so that emboli in multiple directions in the blood vessel can be filtered, and the cross positions can be sewn with thread.

[0069] Optionally, the filter element 2 may be connected to the supporting body by sewing.

[0070] Optionally, the filter element 2 may be made of a polymer material or a textile fabric material.

[0071] like Figure 3 and 4As shown, in the second aspect, an embodiment of the present application provides a delivery device for a thrombus filtering device, comprising the thrombus filtering device provided in the first aspect, and also comprising a sheath 6, wherein the thrombus filtering device can be accommodated in the sheath 6, and the delivery device also comprises a push rod 8 capable of pushing the thrombus filtering device, thereby being able to push the thrombus filtering device into a blood vessel.

[0072] like Figure 3 and 4 As shown, as an embodiment, the delivery device also includes a support member 7 connected to the proximal end of the sheath tube 6, and the push rod 8 can move in the support member 7, so as to guide the push rod 8, so that the push rod 8 can push the thrombus filtering device into the blood vessel, and the distal end of the push rod 8 contacts the thrombus filtering device, thereby pushing the blood vessel filtering device from the sheath tube 6 into the blood vessel.

[0073] Optionally, a handle may be provided at the proximal end of the push rod 8 to facilitate operation by medical personnel.

[0074] Optionally, the thrombus filtering device releases the anchoring process, and the sheath tube 6 loaded with the thrombus filtering device is inserted into the blood vessel. The puncture direction is perpendicular to the axial direction of the blood vessel, and the insertion depth is approximately between two-thirds and one-third of the diameter of the blood vessel. The portion of the delivery device that does not enter the blood vessel is the support member 7 and the push rod 8. The push rod 8 passes through the support member 7 and is inserted into the interior of the sheath tube 6 and extends to the position where the thrombus filtering device is loaded. The distal end of the push rod 8 is close to the second occluding disk 42 of the thrombus filtering device.

[0075] After completing the first step of puncture, push the push rod 8 while slowly retracting the support member 7. The support member 7 and the push rod 8 cooperate to release the support frame 1 of the thrombus filtering device into the blood vessel. At this time, the pushing distance of the push rod 8 is greater than the retraction distance of the support member 7, which is required to allow the support frame 1 to be inserted into the blood vessel.

[0076] like Figure 5 As shown, after the support frame 1 is released, the support member 7 is fixed, and the push rod 8 pushes the first occluding disk 41 of the thrombus filtering device out of the sheath 6. At this time, the port of the sheath 6 is located on the inner side of the blood vessel wall. After the pushing is completed, the first occluding disk 41 is unfolded and adheres to the blood vessel wall under the action of its own elasticity.

[0077] like Figure 6 As shown, after the above release action is completed, the support frame 1 and the first occluding disc 41 of the thrombus filtering device are both released in the blood vessel. At this time, the push rod 8 is fixed, and the support member 7 is withdrawn proximally, so that the second occluding disc 42 loses the constraint of the sheath 6 and completes the release under the action of its own elasticity. The released second occluding disc 42 fits the outer wall of the blood vessel. At this time, the puncture point is blocked by the clamping action of the inner and outer occluding discs to prevent bleeding.

[0078] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0079] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0080] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A thrombus filtering device, characterized in that: include: A support frame that can be inserted into a blood vessel and allows blood to pass through, the support frame having a contracted state and an expanded state; the support frame includes an abutment portion located at the distal end of the support frame that can abut against the blood vessel wall in the expanded state, and a connection portion located at the proximal end that can be connected to an anchor portion; the abutment portion is a porous arc surface.

2. The thrombus filtering device according to claim 1, characterized in that: The support frame includes an anchor portion, and the anchor portion includes at least one occluding disk. The occluding disk can be attached to the inner side or the outer side of the blood vessel wall.

3. The thrombus filtering device according to claim 2, characterized in that: The anchor portion includes two occluding discs, which are respectively configured as a first occluding disc and a second occluding disc for being attached to the inner side and the outer side of the blood vessel wall, and the first occluding disc and the second occluding disc are connected to each other.

4. The thrombus filtering device according to claim 3, characterized in that: The radial dimension of the first occluding disk is smaller than that of the second occluding disk.

5. The thrombus filtering device according to claim 3 or 4, characterized in that: The first occluding disk is connected to the second occluding disk via a connecting section, and the connecting section can pass through the puncture hole on the blood vessel wall.

6. The thrombus filtering device according to any one of claims 1 to 4, characterized in that: The anchor part is a mesh structure.

7. The thrombus filtering device according to any one of claims 1 to 4, characterized in that: The supporting frame is spherical.

8. The thrombus filtering device according to any one of claims 1 to 4, characterized in that: The anchor portion and the support frame are both elastic members.

9. The thrombus filtering device according to any one of claims 1 to 4, characterized in that: The support frame is a spherical structure formed by weaving at least one metal wire, and the metal wires are cross-connected at the distal end to form the anchor part.

10. The thrombus filtering device according to any one of claims 1 to 4, characterized in that: At least one filter element for filtering blood clots is also arranged in the support frame.

11. A delivery device for a thrombus filtering device, characterized in that: The invention comprises the thrombus filtering device according to any one of claims 1 to 10, a sheath tube for accommodating the thrombus filtering device, and a push rod for pushing the thrombus filtering device.

12. The conveying device according to claim 11, characterized in that It comprises a support member connected to the proximal end of the sheath tube, the push rod can move in the support member, and the distal end of the push rod can contact the thrombus filtering device.

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