Filter system

Abstract

The present application relates to a filter system, comprising a filter, a distal end of the filter is gathered to a distal end piece, a proximal end of the filter is gathered to a connecting piece, interiors of the connecting piece and the distal end piece are penetrated along an axial direction, a delivery device, the delivery device comprises a sheath and a delivery piece capable of moving along an interior of the sheath, the delivery piece comprises an inner tube and an outer tube sleeved outside the inner tube, a distal end of the inner tube is provided with a deformation zone, a distal end of the outer tube is provided with a connecting zone, the outer tube and the inner tube can move independently, the connecting zone is detachably connected to the connecting piece, the deformation zone comprises at least two support rods, distal ends of the support rods can pass through the connecting piece and then pass through the distal end piece. By setting the deformation zone on the inner tube, the deformation zone leaves the sheath before the filter, which can facilitate the operator to monitor whether the to-be-released position is accurate, in addition, a stable support force is formed on the distal end side of the filter in the release stage, which reduces the possibility of displacement and deviation of the filter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interventional medical devices, and in particular to a filter system. BACKGROUND

[0002] Interventional therapy is a kind of minimally invasive treatment technology for diseases through catheter and other instruments under the guidance of medical imaging equipment. In the process of interventional therapy, the delivery of the carrier is one of the key steps. In the prior art, for the filter, the filter itself is generally used as a development mark to reflect the position. In order to accurately judge whether it reaches the accurate position, it is generally necessary to develop it again after leaving the sheath tube, but the filter itself is a high-intensity structure formed by cutting, and it is difficult to recover the sheath tube and release it again if the position is not accurate after leaving the sheath tube. In addition, unnecessary recovery action will greatly affect its service life and will also bring unpredictable risks. SUMMARY

[0003] Therefore, it is necessary to provide an improved filter system for the problems existing in the prior filter system, as follows:

[0004] A filter system is provided, comprising:

[0005] a filter, a distal end of the filter being gathered into a distal end piece, a proximal end of the filter being gathered into a connecting piece, interiors of the connecting piece and the distal end piece being penetrated along an axial direction,

[0006] a delivery device, the delivery device comprising a sheath tube and a delivery piece capable of moving along the interior of the sheath tube, the delivery piece comprising an inner tube and an outer tube sleeved on the exterior of the inner tube, a distal end of the inner tube being provided with a deformation zone, a distal end of the outer tube being provided with a connecting zone, the outer tube and the inner tube being capable of relatively independent movement, the connecting zone being detachably connected to the connecting piece, the deformation zone comprising at least two support rods, the distal ends of the support rods being capable of passing through the connecting piece and then passing through the distal end piece.

[0007] In one of the embodiments, the deformation zone comprises a first support rod and a second support rod, the first support rod and the second support rod being emitted from the distal end of the inner tube, in a natural state, the first support rod and the second support rod respectively tilting and extending to the distal end.

[0008] In one of the embodiments, the maximum diameters of the first support rod and the second support rod are both smaller than the inner diameter of the distal end piece.

[0009] In one of the embodiments, the distal end of the inner tube is capable of extending through the distal end piece along the axial direction.

[0010] In one of the embodiments, the length of the shortest support rod among the first support rod and the second support rod is greater than the total length of the filter in the natural state.

[0011] In one embodiment, a limiting pin is included, which can span the inner tube and the outer tube.

[0012] In one embodiment, a binding member is further included, which is slidably arranged outside the deformation zone.

[0013] In one embodiment, the binding member is controlled in position by a rod arranged inside the delivery member.

[0014] In one embodiment, the outer diameter of the binding member is smaller than the inner diameter of the connecting member.

[0015] In one embodiment, the proximal end of the deformation zone is fixed to a bearing, which is fixed to the distal end of the inner tube.

[0016] Compared with the prior art, the present application provides a filter system, which comprises a filter, a distal end of the filter is gathered to a distal end member, a proximal end of the filter is gathered to a connecting member, the interiors of the connecting member and the distal end member are penetrated in the axial direction, a delivery device, which comprises a sheath and a delivery member capable of moving inside the sheath, the delivery member comprises an inner tube and an outer tube arranged outside the inner tube, a distal end of the inner tube is provided with a deformation zone, a distal end of the outer tube is provided with a connecting zone, the outer tube and the inner tube can move independently relative to each other, the connecting zone is detachably connected to the connecting member, the deformation zone comprises at least two support rods, distal ends of the support rods can pass through the connecting member and then pass through the distal end member. By arranging the deformation zone on the inner tube, the deformation zone leaves the sheath prior to the filter, which can facilitate the operator to monitor whether the to-be-released position is accurate, in addition, a stable supporting force is formed on the distal end side of the filter during the releasing stage, which reduces the possibility of displacement and deviation of the filter. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the filter of the filter system in embodiment 1 in a natural state;

[0018] Figure 2 is a structural schematic diagram of the delivery device of the filter system in embodiment 1 in a natural state;

[0019] Figure 3 is a structural schematic diagram of the filter and the delivery device of the filter system in embodiment 1 in a releasing state;

[0020] Figure 4 is a structural schematic diagram of the filter and the delivery device of the filter system in embodiment 1 in a delivery state;

[0021] Figure 5 is a structural cross-sectional schematic diagram of the delivery device of the filter system in embodiment 2 in a natural state;

[0022] Figure 6 is a cross-sectional view of the delivery device of the filter system in embodiment 3 in a natural state;

[0023] Figure 7 is a cross-sectional view of the delivery device of the filter system in embodiment 3 in a first state. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0025] It should be noted that in the field of interventional medical devices, the end of a medical device implanted in a human or animal body closer to an operator is generally referred to as the "proximal end", and the end farther from the operator is generally referred to as the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined according to this principle. The "axial direction" generally refers to the length direction of the medical device when it is being delivered, and the "radial direction" generally refers to the direction perpendicular to the "axial direction" of the medical device, and the "axial direction" and "radial direction" of any component of the medical device are defined according to this principle. The "connection" mentioned in the embodiments includes the case where two components are directly connected and the case where two components are indirectly connected through other components.

[0026] The technical solutions of the present application will be further described in detail below with reference to specific embodiments.

[0027] Embodiment 1

[0028] Referring to the accompanying drawings Figures 1-4 , Figure 1 is a structural view of the filter 100 of the filter system in embodiment 1 in a natural state; Figure 2 is a structural view of the delivery device 200 of the filter system in embodiment 1 in a natural state; Figure 3 is a structural view of the filter 100 and the delivery device 200 of the filter system in embodiment 1 in a released state; Figure 4Fig. 1 is a structural schematic view of a filter system in a delivery state according to an embodiment of the present application; the embodiment provides a filter system comprising a filter 100 and a corresponding delivery device 200, for the filter 100, the filter 100 comprises a main body 110, a proximal end part 120 and a distal end part 130, the proximal end part 120 and the distal end part 130 are respectively arranged at the proximal end side and the distal end side of the main body 110, the main body part 110 comprises a plurality of support members extending in the axial direction and distributed in the circumferential direction, the proximal end part 120 extends from the main body part 110, the proximal end of the proximal end part 120 is gradually tapered to a connecting member 121, the distal end part 130 extends from the main body part 110, the distal end of the distal end part 130 is gradually tapered to a distal end member 131, in the embodiment, the connecting member 121 is preferably a steel sleeve with internal threads, and the connecting member 121 is penetrated in the axial direction inside, the distal end member 131 is preferably a steel sleeve, and the distal end member 131 is penetrated in the axial direction inside.

[0029] For the filter 100, the prior art generally uses a steel cable for delivery, the distal end of the steel cable is releasably fixed to the proximal end of the proximal end part 120 of the filter 100, after the filter is withdrawn from the sheath by the steel cable, the filter is expanded under the self-restoring shape of the filter to form an implant, and then the steel cable is operated to be released from the filter, and the steel cable is withdrawn.

[0030] The delivery device 200 provided by the embodiment comprises a delivery member 210 and a sheath 220, the delivery member 210 is a long straight cylinder extending in the axial direction as a whole, the delivery member 210 can move inside the sheath 220 to complete delivery, the delivery member 210 comprises a deformation zone 211, a connecting zone 212 and a main body zone 213 arranged in sequence from the distal end to the proximal end, wherein the connecting zone 212 comprises an external thread structure extending in the axial direction, and the thread of the connecting zone 212 is arranged corresponding to the internal thread of the connecting member 121 of the proximal end part 120 of the filter 100, so that the connecting zone 212 and the connecting member 121 can be detachably connected.

[0031] In the embodiment, the connecting zone 212 can completely pass through the position of the connecting member 121 by rotating.

[0032] The main body zone 213 comprises an external spring tube structure, the spring tube can increase the strength of the delivery member 210 without affecting the bending performance of the spring tube, and can assist in transmitting the rotational torque from the proximal end, so as to avoid that due to the length of the main body zone 213 being too long, there is a long lag for the operator to operate the distal end of the delivery device 200.

[0033] In the embodiment, the connecting member 121 and the distal end member 131 of the filter 100 are penetrated in the axial direction inside, and the delivery member 210 connected by the connecting member 121 can pass through the connecting member 121, specifically, the deformation zone 211 can pass through the connecting member 121 and the distal end member 131.

[0034] In this embodiment, the deformation zone 211 includes at least two support rods, referred to as the first support rod 2111 and the second support rod 2112. The first support rod 2111 and the second support rod 2112 extend from the far end of the connecting zone 212, and then the first support rod 2111 and the second support rod 2112 extend obliquely to the far end, and after bending, extend to the proximal end, thereby forming a back-bending structure. In this embodiment, the first support rod 2111 and the second support rod 2112 are preferably made of shape memory metals such as nickel-titanium.

[0035] In another embodiment, in order to enhance the developing effect of the first support rod 2111 and the second support rod 2112, additional developing material can be added to the ends of the first support rod 2111 and the second support rod 2112.

[0036] In this embodiment, the ends of the first support rod 2111 and the second support rod 2112 are provided with ball heads.

[0037] During transport, please refer to the instruction manual again. Figure 4 , attached Figure 4 The simplified state of the filter 100 and the conveying device 200 in the conveying state is shown. The filter 100 is in the sheath of the conveying device 200 and is compressed and elongated. The connecting part 121 of the filter 100 is connected to the connecting area 212 of the conveying member 210 of the conveying device 200. The conveying member 210 passes through the connecting part 121 and the distal member 130 of the filter 100. Specifically, the connecting area 212 of the conveying member 210 is threadedly connected to the connecting part 121 of the filter 100. The deformable area 211 of the conveying member 210 passes through the distal member 131 of the filter 100. The first support rod 2111 and the second support rod 2112 are also compressed and elongated. The ball ends of the first support rod 2111 and the second support rod 2112 are located on the distal side of the distal member 131.

[0038] During the release phase, please refer to the instruction manual again. Figure 3 During release, the ball heads at the ends of the first support rod 2111 and the second support rod 2112 first leave the sheath 220 of the delivery device 200. The first support rod 2111 and the second support rod 2112 begin to deform and return to their original shape without being subjected to external force. The first support rod 2111 and the second support rod 2112 gradually expand and press against the inner wall of the blood vessel, thereby achieving the following effects:

[0039] (1) When the first support rod 2111 and the second support rod 2112 are released, their ends reach the inner wall of the blood vessel. It can be monitored whether they have reached the predetermined position. If the position is incorrect, they can be pulled back directly. The first support rod 2111 and the second support rod 2112 are retracted into the sheath 220 and then released again. During this process, the filter 100 is still inside the sheath 220 and there is no deformation after release. That is, there is no need to perform the action of retraction and adjustment, which is conducive to maintaining the integrity of the filter 100's lifespan.

[0040] (2) When the predetermined position is reached, the first support rod 2111 and the second support rod 2112 are released. The first support rod 2111 and the second support rod 2112 also abut against the inner wall of the blood vessel and play a certain limiting role. Thus, during the release process, the filter 100 is limited from the proximal end by the delivery member 210, and is also limited from the distal end by the first support rod 2111 and the second support rod 2112, thereby ensuring the stability of the delivery state.

[0041] (3) When the filter 100 is released, the distal end 131 is supported by the first support rod 2111 and the second support rod 2112 against the inner wall of the blood vessel, and the proximal end connector 121 is also fixed with the delivery member 210. Thus, both the proximal and distal ends of the filter 100 are supported, which makes the filter 100 well centered and has a low possibility of displacement when released.

[0042] (4) In addition to the above effects, it should also be noted that since the filter 100 is shaped like a spindle, when the proximal end 120 of the filter 100 is detached from the sheath 220, the proximal end 120 moves toward the distal end and expands at the same time. There is pressure and corresponding reaction force on the edge of the sheath 220. If the delivery component 210 fails to provide sufficient tension (i.e., the operator does not tighten it), the expansion of the proximal end 120 is unrestricted. Part of the resultant force of the reaction force given to the proximal end 120 by the sheath 220 is directed toward the distal end, which will cause the proximal end 120 to push the filter 100 out a short distance toward the distal end. On the one hand, this may cause impact and damage to the blood vessel wall, and on the other hand, it may also cause the filter 100 to shift. In this embodiment, after the filter 100 reaches the predetermined position, it is resisted by the first support rod 2111 and the second support rod 2112 when it moves toward the far end. The resistance is applied to the edge of the far end member 131 of the filter 100 through the first support rod 2111 and the second support rod 2112, so that the force of the resistance is in the center position and will not cause the filter to deviate.

[0043] After release, the delivery member 210 is detached from the filter 100, and the first support rod 2111 and the second support rod 2112 pass through the distal member 131 of the filter 100 and are pulled back into the sheath 220.

[0044] In another embodiment, the first support rod 2111 and the second support rod 2112 extend from the far end of the connecting area 212. Then, the first support rod 2111 and the second support rod 2112 extend outward at an angle and no longer bend, that is, they directly expand radially. Compared with this embodiment, the resistance generated after expansion is greater and the stability is better. However, the thrust required for the pusher 210 to continue pushing and releasing towards the far end will also increase.

[0045] Since the conveyor 210 needs to rotate when it is detached from the filter 100, in this embodiment, preferably, the deformation zone 211 and the connecting zone 212 are rotatably connected for the conveyor 210. Specifically, the proximal end of the deformation zone 211 is fixed to a bearing, and the bearing is fixed to the distal end of the connecting zone 212. Thus, the rotation of the connecting zone 212 does not affect the deformation zone 211.

[0046] In essence, since the filter 100 has already been implanted when it is released, the rotation of the deformation zone 211 will not affect the filter 100. Since the deformation zone 211 itself does not pierce the blood vessel wall, its rotation itself will not cause damage. The bearing design is only to minimize other possible effects.

[0047] In this embodiment, the lengths of the first support rod 2111 and the second support rod 2112 are respectively greater than the total length of the filter 100 in its natural state (that is, the distance from the proximal end to the distal end of the filter 100 in its natural state), so that when the conveying member 210 is withdrawn, the proximal ends of the first support rod 2111 and the second support rod 2112 have entered the sheath 220 and are restricted by the sheath 220 before the distal ends of the first support rod 2111 and the second support rod 2112 have passed through the distal end member 131.

[0048] In another embodiment, the ends of the first support rod 2111 and the second support rod 2112 are not provided with ball heads, and the ends of the first support rod 2111 and the second support rod 2112 are bent back in their extension direction to avoid the ends directly contacting the blood vessel wall. In this embodiment, since the ends of the first support rod 2111 and the second support rod 2112 are not provided with ball heads, they will not interfere with or squeeze each other in the sheath 220.

[0049] In this embodiment, in order to ensure that the deformation zone 211 of the conveying component 210 works normally, the sum of the diameters of the first support rod 2111 and the second support rod 2112 is less than the smaller inner diameter of the inner diameter of the distal end component 131 of the filter 100 and the inner diameter of the connector 121, thereby ensuring that the first support rod 2111 and the second support rod 2112 can freely pass through the distal end component 131.

[0050] In this embodiment, the ends of the first support rod 2111 and the second support rod 2112 are provided with ball heads. Therefore, the sum of the diameter of the ball head at the end of the first support rod 2111 and the diameter of the ball head at the end of the second support rod 2112 is less than the smallest inner diameter among the inner diameter of the distal end member 131 of the filter 100 and the inner diameter of the connector 121, thereby ensuring that the first support rod 2111 and the second support rod 2112 can freely pass through the distal end member 131.

[0051] In another embodiment, to avoid the ball ends of the first support rod 2111 and the second support rod 2112 squeezing each other during transport, the actual length of the first support rod 2111 is greater than the actual length of the second support rod 2112, so that the ball ends of the first support rod 2111 and the second support rod 2112 are at different axial positions. At the same time, for the recycling process, only one ball end passes through the distal end 131 at any given time. Therefore, in this embodiment, the diameter of the ball end of the first support rod 2111 and the diameter of the ball end of the second support rod 2112 are both smaller than the inner diameter of the distal end 131 of the filter 100.

[0052] In another embodiment, the inner diameter of the distal member 131 is greater than or equal to the inner diameter of the connector 121. Therefore, to ensure the normal operation of the deformation zone 211 of the conveyor 210, the sum of the diameters of the first support rod 2111 and the second support rod 2112 is less than the diameter of the connector 121 of the filter 100, thereby ensuring that the first support rod 2111 and the second support rod 2112 can freely pass through the distal member 131. If the ends of the first support rod 2111 and the second support rod 2112 are provided with ball heads, then the first support rod... The sum of the diameter of the end ball of the first support rod 2111 and the diameter of the end ball of the second support rod 2112 is less than the inner diameter of the connector 121 of the filter 100. If the actual length of the first support rod 2111 is greater than the actual length of the second support rod 2112, only one ball can pass through the distal part 131 at any given time. Therefore, in this embodiment, the diameter of the end ball of the first support rod 2111 and the diameter of the end ball of the second support rod 2112 are both less than the inner diameter of the connector 121 of the filter 100.

[0053] In this embodiment, when pre-assembling the filter 100 and the conveyor 210, the first support rod 2111 and the second support rod 2112 are first passed through the connector 121 and the distal part 131 of the filter 100, and then the connection area 212 of the conveyor 210 is tightened with the connector 121 of the filter 100.

[0054] In another embodiment, the deformation area 211 and the connecting area 212 are detachably connected, so that they can be assembled separately during pre-assembly. The specific connection method can be a snap-fit ​​or a threaded connection. However, in the threaded structure, the direction of the thread must be opposite to the direction of the thread in the connecting area 212. This is because the deformation area 211 is separated from the connecting area 212 only for the convenience of assembly, and after pre-assembly, the deformation area 211 does not need to be separated from the connecting area 212.

[0055] Example 2

[0056] The improvement of Example 2 compared to Example 1 focuses on the conveying device itself, specifically, referring to... Figure 5 , Figure 5 This is a schematic cross-sectional view of the conveying device of the filter system in its natural state according to Embodiment 2 of the present invention. In this embodiment, the conveying component 210 includes an inner tube 230 and an outer tube 240 sleeved outside the inner tube 230. A deformation zone 211 is located at the distal end of the inner tube 230, and a connecting zone 212 and a main body zone 213 are sequentially located at the distal end of the outer tube 240. The inner tube 230 and the outer tube 240 are relatively independent and can move freely. In this embodiment, the first support rod 2111 and the second support rod 2112 of the deformation zone 211 extend from the distal end of the inner tube 230.

[0057] The functions of the deformation zone 211, the connecting zone 212, and the main body zone 213 are the same as in Embodiment 1. The inner tube 230 can drive the first support rod 2111 and the second support rod 2112 of the deformation zone 211 to move freely. Thus, the rotation of the outer tube 240 does not affect the inner tube 230. In addition, during preloading, the inner tube 230 can be used to pass through the distal end member 131 and the connecting member 121 of the filter 100 from the distal end to the proximal end. Then, the outer tube 240 can be screwed onto the filter 100 from the proximal end to the distal end.

[0058] In this embodiment, the actual lengths of the first support rod 2111 and the second support rod 2112 are greater than the total length of the filter 100 in its natural state (i.e., the distance from the proximal end to the distal end of the filter 100 in its natural state). This ensures that when the conveying member 210 is retracted, the proximal ends of the first support rod 2111 and the second support rod 2112 have entered the inner tube 230 and are restricted by the inner tube 230 before the distal ends of the first support rod 2111 and the second support rod 2112 have passed through the distal end member 131. Since the inner diameter of the inner tube 230 is smaller than that of the sheath 200, this arrangement is more effective in this embodiment.

[0059] In another embodiment, the maximum diameter of the first support rod 2111 and the maximum diameter of the second support rod 2112 are both smaller than the inner diameter of the outer tube 240. That is, the maximum diameter of the deformation zone 211 is smaller than the diameter of the outer tube 240. Thus, when the deformation zone 211 does not need to function, the deformation zone 211 can be completely retracted into the outer tube 240 under the action of the inner tube 230, and the outer tube 240 can be used for operation. However, in the corresponding release process, the distal end of the inner tube 230 needs to be extended axially through the distal end member 131 first. Otherwise, the first support rod 2111 and the second support rod 2112 cannot pass through the distal end member 131 to function.

[0060] In this embodiment, it is also important to note that the relative position of the inner tube 230 and the outer tube 240 determines the amount of extension of the deformation zone 211 relative to the distal member 131, that is, the amount of expansion deformation of the deformation zone 211. Therefore, if the relative position of the inner tube 230 and the outer tube 240 is shortened and fixed, the portion of the deformation zone 211 extending beyond the distal member 131 will also limit the filter 100. At this time, the filter 100 is essentially clamped between the distal side of the deformation zone 211 and the connecting area 212, and the clamping force is adjustable. In this case, there is no need to wait for the deformation zone 211 to contact the blood vessel wall to limit the filter 100, thereby minimizing the impact on the human body. Therefore, a limiting pin can be added. When the limiting pin is inserted, it passes through (i.e., spans) the inner tube 230 and the outer tube 240, and the relative axial position of the inner tube 230 and the outer tube 240 is locked.

[0061] In this embodiment, the inner tube 230 and the outer tube 240 can also be connected by threads. When passing through the threaded area, the two can only rotate relative to each other and cannot slide, thereby maintaining the sealing of the inner tube 230 and the outer tube 240. In order to prevent the inner tube 230 from rotating and causing the deformation zone 211 to rotate, the proximal side of the deformation zone 211 is fixed on the bearing, and the bearing is fixed to the distal end of the inner tube 230.

[0062] Example 3

[0063] The improvement of Example 3 compared to Example 1 or Example 2 focuses on the conveying device, specifically, referring to... Figures 6-7 , Figure 6 This is a cross-sectional schematic diagram of the conveying device of the filter system in the natural state in Embodiment 3 of the present invention; Figure 7 This is a cross-sectional schematic diagram of the conveying device of the filter system in the first state according to Embodiment 3 of the present invention.

[0064] The conveying component 210 includes a restraining component 250, which is slidably disposed outside the deformation zone 211. The position of the restraining component is controlled by a rod passing through the inside of the conveying component 210. When the restraining component 250 slides axially, the distance between the first support rod 2111 and the second support rod 2112 can be controlled within the inner diameter of the restraining component 250. The position of the restraining component 250 can also adjust the shape of the first support rod 2111 and the second support rod 2112 after release, so that they can obtain greater or less support force. In addition, when preloading, moving the restraining component 250 to the far end of the deformation zone 211 can make the far ends of the first support rod 2111 and the second support rod 2112 generally form a straight line, which is conducive to loading. Furthermore, when transporting within the sheath, the restraining component remaining at the far end of the deformation zone 211 can also significantly reduce the resistance of the conveying.

[0065] In this embodiment, the outer diameter of the restraint member 250 is smaller than the inner diameter of the connector 121, thereby ensuring that the restraint member 250 can be freely removed.

[0066] It should be noted that the technical features of the above embodiments can be combined arbitrarily and can also be applied to various types of filters and filters with similar structures as described above. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; however, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A filter system, characterized in that, include A filter, wherein the distal end of the filter converges to a distal member, and the proximal end of the filter converges to a connecting member, wherein the interior of both the connecting member and the distal member extends axially through the filter. A conveying device includes a sheath and a conveying component that can move along the inside of the sheath. The conveying component includes an inner tube and an outer tube sleeved outside the inner tube. The distal end of the inner tube is provided with a deformation zone, and the distal end of the outer tube is provided with a connecting zone. The outer tube and the inner tube can move relatively independently. The connecting zone is detachably connected to the connecting component. The deformation zone includes at least two support rods, and the distal ends of the at least two support rods can pass through the connecting component and then through the distal component. The at least two support rods include a first support rod and a second support rod, which extend from the distal end of the inner tube. In their natural state, the first support rod and the second support rod extend distally to abut against the inner wall of the blood vessel. It also includes a restraint member, which is slidably disposed outside the deformation zone. The position of the restraint member can be used to adjust the shape of the first support rod and the second support rod after release, so that they can obtain greater or less support force.

2. The filter system according to claim 1, characterized in that, The maximum diameter of both the first support rod and the second support rod is smaller than the inner diameter of the distal end component.

3. The filter system according to claim 1, characterized in that, The distal end of the inner tube may extend axially through the distal end piece.

4. The filter system according to claim 1, characterized in that, The shortest of the first and second support rods is longer than the total length of the filter in its natural state.

5. The filter system according to claim 1, characterized in that, Includes a limiting pin that can span across the inner tube and the outer tube.

6. The filter system according to claim 1, characterized in that, The restraint is controlled by a rod inserted inside the conveyor.

7. The filter system according to claim 1, characterized in that, The outer diameter of the restraint member is smaller than the inner diameter of the connector.

8. The filter system according to claim 1, characterized in that, The proximal end of the deformation zone is fixed to a bearing, and the bearing is fixed to the distal end of the inner tube.

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