Filter system

Abstract

The invention relates to a filter system which comprises a filter, the far end of the filter is collected to a far-end piece, the near end of the filter is collected to a connecting piece, the interiors of the connecting piece and the far-end piece penetrate in the axial direction, the conveying device comprises a sheath tube and a conveying piece capable of moving along the interior of the sheath tube, and the conveying piece comprises an inner tube and an outer tube arranged outside the inner tube in a sleeving mode. A deformation area is arranged at the far end of the inner pipe, a connecting area is arranged at the far end of the outer pipe, the outer pipe and the inner pipe can move relatively and independently, the connecting area is detachably connected to the connecting piece, the deformation area comprises at least two supporting rods, and the far ends of the supporting rods can penetrate through the far-end piece after passing through the connecting piece. By arranging the deformation area on the inner tube, the deformation area leaves the sheathing canal before the filter, an operator can conveniently monitor whether the position to be released is accurate or not, in addition, stable supporting force is formed on the far-end side of the filter in the release stage, and the possibility that the filter moves and deviates is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical devices, and particularly to a filter system. Background Art

[0002] Interventional therapy is a technique for minimally invasive treatment of diseases through instruments such as catheters under the guidance of medical imaging equipment. During the process of interventional therapy, the delivery of the load is one of the key steps. In the prior art, for a filter, generally the filter itself is used as a radiopaque marker to indicate its position. To accurately determine whether it reaches the correct position, it is generally necessary to perform imaging after it leaves the sheath. However, since the filter is a structure with relatively high strength formed by cutting, if its position is inaccurate after leaving the sheath, it is very difficult to retract the sheath and release it again. In addition, unnecessary retraction actions will greatly affect its lifespan and also bring unpredictable risks. Summary of the Invention

[0003] Based on this, it is necessary to provide an improved filter system for the problems existing in the existing filter system, specifically as follows:

[0004] There is provided a filter system, comprising:

[0005] A filter, the distal end of the filter converges on a distal member, the proximal end of the filter converges on a connecting member, and the interiors of the connecting member and the distal member are axially penetrated.

[0006] A delivery device, the delivery device includes a sheath and a delivery member that can move inside the sheath. The delivery member includes an inner tube and an outer tube sleeved outside the inner tube. A deformation zone is provided at the distal end of the inner tube, and a connection zone is provided at the distal end of the outer tube. The outer tube and the inner tube can move relatively independently. The connection zone is detachably connected to the connecting member. The deformation zone includes at least two support rods, and the distal ends of the support rods can pass through the connecting member and then pass through the distal member.

[0007] In one embodiment, the deformation zone includes a first support rod and a second support rod. The first support rod and the second support rod extend from the distal end of the inner tube. In the natural state, the first support rod and the second support rod respectively extend obliquely distally.

[0008] In one embodiment, the maximum diameter of the first support rod and the maximum diameter of the second support rod are both smaller than the inner diameter of the distal member.

[0009] In one embodiment, the distal end of the inner tube can axially extend through the distal member.

[0010] In one embodiment, 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 limit pin is included, and the limit pin can span across the inner tube and the outer tube.

[0012] In one embodiment, a restraint member is further included, and the restraint member is slidably disposed outside the deformation zone.

[0013] In one embodiment, the position of the restraint member is controlled by a rod passing through the inside of the delivery member.

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

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

[0016] Compared with the prior art, the present invention provides a filter system, including a filter, the distal end of the filter converges to a distal member, the proximal end of the filter converges to a connecting member, the interiors of the connecting member and the distal member are both axially penetrated, a delivery device, the delivery device includes a sheath and a delivery member capable of moving inside the sheath, the delivery member includes an inner tube and an outer tube sleeved outside the inner tube, a deformation zone is provided at the distal end of the inner tube, a connection zone is provided at the distal end of the outer tube, the outer tube and the inner tube can move relatively independently, the connection zone is detachably connected to the connecting member, the deformation zone includes at least two support rods, and the distal ends of the support rods can pass through the connecting member and then pass through the distal member. By providing a 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 position to be released is accurate. In addition, a stable supporting force is formed on the distal side of the filter during the release stage, reducing the possibility of the filter shifting and offsetting. Description of the Drawings

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

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

[0019] Figure 3 is a schematic structural diagram of the filter and the delivery device of the filter system in Embodiment 1 of the present invention in a released state;

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

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

[0022] Figure 6 It is a schematic cross-sectional view of the delivery device of the filter system in Embodiment 3 of the present invention in its natural state;

[0023] Figure 7 It is a schematic cross-sectional view of the delivery device of the filter system in Embodiment 3 of the present invention in its first state. Detailed implementation manners

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention 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 invention and are not used to limit the present invention.

[0025] It should be noted that in the field of interventional medical devices, generally, the end of a medical device implanted into the human body or an animal body that is closer to the operator is called the "proximal end", and the end that is farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined based on 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 its "axial direction", and the "axial direction" and "radial direction" of any component of the medical device are defined based on this principle. The "connection" mentioned in the embodiments includes the cases where two components are directly connected and indirectly connected through other components.

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

[0027] Embodiment 1

[0028] Refer to the accompanying drawings of the specification Figures 1-4 , Figure 1 It is a schematic structural view of the filter 100 of the filter system in Embodiment 1 of the present invention in its natural state; Figure 2 It is a schematic structural view of the delivery device 200 of the filter system in Embodiment 1 of the present invention in its natural state; Figure 3 It is a schematic structural view of the filter 100 and the delivery device 200 of the filter system in Embodiment 1 of the present invention in the released state; Figure 4It is a schematic structural diagram of the filter 100 and the delivery device 200 of the filter system in the delivery state in Embodiment 1 of the present invention; this embodiment provides a filter system, including a filter 100 and a corresponding delivery device 200. For the filter 100, the filter 100 includes a main body 110, a proximal end portion 120 and a distal end portion 130. The proximal end portion 120 and the distal end portion 130 are respectively arranged on the proximal side and the distal side of the main body 110. The main body portion 110 includes a plurality of support members extending axially and distributed circumferentially. The proximal end portion 120 extends from the main body portion 110, and its proximal end gradually converges to a connecting member 121. The distal end portion 130 extends from the main body portion 110, and its distal end gradually converges to a distal member 131. In this embodiment, the connecting portion 121 is preferably a steel sleeve with internal threads, and the inside of the connecting member 121 penetrates axially. The distal member 131 is preferably a steel sleeve, and the inside of the distal member 131 penetrates axially.

[0029] For the filter 100, in the prior art, a steel cable is generally used for delivery. The distal end of the steel cable is detachably fixed to the proximal end of the proximal end portion 120 of the filter 100. After the filter is withdrawn from the sheath by the steel cable, the filter expands under the tendency of its own shape recovery to form an implant, and then the steel cable is operated to be disengaged from the filter, and then the steel cable is withdrawn.

[0030] The delivery device 200 provided in this embodiment includes a delivery member 210 and a sheath 220. The delivery member 210 is an axially extending long straight cylinder as a whole. The delivery member 210 can move along the inside of the sheath 220 to complete the delivery. The delivery member 210 includes a deformation zone 211, a connection zone 212, and a main body zone 213 arranged in sequence from the distal end to the proximal end. Among them, the connection zone 212 includes an axially extending external thread structure. The thread of the connection zone 212 is arranged corresponding to the internal thread of the connecting member 121 of the proximal end portion 120 of the filter 100. Therefore, the connection zone 212 and the connecting member 121 are detachably connected.

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

[0032] The main body zone 213 includes an externally covered spring tube structure. The spring tube can increase the strength of the delivery member 210 without affecting its bending performance, and can assist in transmitting the rotational torque from the proximal end, avoiding excessive lag of the distal end of the delivery device 200 for the operator during operation due to the excessive length of the main body zone 213.

[0033] In this embodiment, the connecting member 121 and the distal member 131 of the filter 100 penetrate axially inside. The delivery member 210 connected by the connecting portion 121 can pass through the connecting portion 121. Specifically, the deformation zone 211 can pass through the connecting member 121 and the distal member 131.

[0034] In this embodiment, the deformation region 211 includes at least two support rods, denoted 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 distal end of the connection region 212, and then the first support rod 2111 and the second support rod 2112 respectively extend obliquely towards the distal end and, after being bent, extend towards the proximal end, thereby forming a bent-back structure. In this embodiment, the first support rod 2111 and the second support rod 2112 are preferably made of a memory metal such as nickel-titanium.

[0035] In another embodiment, in order to enhance the imaging effect of the first support rod 2111 and the second support rod 2112, additional imaging materials 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] In the delivery state, referring back to the accompanying drawings of the specification Figure 4 , the accompanying Figure 4 shows a brief state of the filter 100 and the delivery device 200 in the delivery state. The filter 100 is in the sheath of the delivery device 200, the filter 100 is compressed and elongated, the connection portion 121 of the filter 100 is connected to the connection region 212 of the delivery member 210 of the delivery device 200, and the delivery member 210 passes through the connection portion 121 and the distal member 130 of the filter 100. Specifically, the connection region 212 of the delivery member 210 is threadedly connected to the connection portion 121 of the filter 100, the deformation region 211 of the delivery member 210 passes through the distal member 131 of the filter 100, and the first support rod 2111 and the second support rod 2112 are also compressed and elongated, and the ball heads at the 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] In the release phase, referring back to the accompanying drawings of the specification Figure 3 , when releasing, 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, and the first support rod 2111 and the second support rod 2112 start to deform and return to their original state without external force, and the first support rod 2111 and the second support rod 2112 gradually expand and abut 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 position of the blood vessel inner wall, and it can be monitored whether they reach the predetermined position. If the position is incorrect, they can be directly pulled back, and 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 entire filter 100 remains inside the sheath 220, without any deformation after release, that is, there is no need to perform the action of readjustment after recovery, which is beneficial to maintaining the integrity of the life of the filter 100.

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

[0041] (3) When releasing, the distal member 131 of the filter 100 is supported by the first support rod 2111 and the second support rod 2112 abutting against the blood vessel inner wall, and the proximal connecting member 121 is also fixed to the conveying member 210. Then both the proximal and distal ends of the filter 100 are supported, so that the filter 100 has good centering during release and a low possibility of deviation.

[0042] (4) In addition to the above effects, it should also be noted that since the filter 100 is generally in a shape similar to a spindle, when the proximal end portion 120 of the filter 100 disengages from the sheath 220, the proximal end portion 120 is simultaneously moving towards the distal end and expanding, exerting pressure and corresponding reaction forces on the edge of the sheath 220. At this time, if the conveying member 210 fails to provide sufficient pulling force (that is, the operator does not pull tightly), the expansion of the proximal end portion 120 is not restricted, and a part of the resultant force of the reaction force given by the sheath 220 to the proximal end portion 120 is towards the distal end direction, which will cause the proximal end portion 120 to drive the entire filter 100 to pop out a short distance towards the distal end portion. On the one hand, it may cause impact and damage to the blood vessel wall, and on the other hand, it may also cause the filter 100 to shift. With the design of this embodiment, after the entire filter 100 reaches the predetermined position and then moves towards the distal end, it is resisted by the first support rod 2111 and the second support rod 2112, and this resistance acts on the edge of the distal 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 at the central position and will not cause the filter to deviate.

[0043] After the release is completed, the conveying member 210 is disengaged 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 retracted into the sheath 220.

[0044] In another embodiment, the first support rod 2111 and the second support rod 2112 extend from the distal end of the connection area 212, and then the first support rod 2111 and the second support rod 2112 respectively extend obliquely towards the distal end without further bending, that is, directly expand radially. Compared with this embodiment, the resistance to movement towards the distal end generated after expansion is greater and the stability is better, but the thrust required for the pusher 210 to continue pushing and releasing towards the distal end will also increase.

[0045] Since the conveying member 210 needs to rotate when disengaging from the filter 100, in this embodiment, preferably, for the conveying member 210, the deformation area 211 and the connection area 212 are rotatably connected. Specifically, the proximal side of the deformation area 211 is fixed to a bearing, and the bearing is fixed to the distal end of the connection area 212. Thus, the rotation of the connection area 212 does not affect the deformation area 211.

[0046] Substantially, since the filter 100 has been implanted when disengaging, the rotation of the deformation area 211 will not affect the filter 100 either. Since the deformation area 211 itself does not penetrate the blood vessel wall, its rotation itself will not cause damage, and the design of the bearing is only to minimize other possible impacts as much as possible.

[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 the natural state (that is, the distance from the proximal end to the distal end of the filter 100 in the natural state), so that when the conveying member 210 is withdrawn, before the distal ends of the first support rod 2111 and the second support rod 2112 pass through the distal member 131, their proximal ends have entered the sheath 220 and are restricted by the sheath 220.

[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 respectively towards their extending directions 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 and squeeze each other in the sheath 220.

[0049] In this embodiment, in order to ensure the normal operation of the deformation area 211 of the conveying member 210, the sum of the diameters of the first support rod 2111 and the second support rod 2112 is smaller than the minimum inner diameter of the distal member 131 of the filter 100 and the inner diameter of the connecting member 121, so as to ensure that the first support rod 2111 and the second support rod 2112 can freely pass through the distal member 131.

[0050] In this embodiment, ball heads are provided at the ends of the first support rod 2111 and the second support rod 2112. Therefore, the sum of the diameters of the ball heads at the ends of the first support rod 2111 and the second support rod 2112 is less than the minimum inner diameter of the distal member 131 of the filter 100 and the inner diameter of the connecting member 121, so as to ensure that the first support rod 2111 and the second support rod 2112 can freely pass through the distal member 131.

[0051] In another embodiment, in order to prevent the ball heads at the ends of the first support rod 2111 and the second support rod 2112 from squeezing each other during transportation, 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 heads at the ends of the first support rod 2111 and the second support rod 2112 are in different axial positions. At the same time, for the recovery process, only one ball head passes through the distal member 131 at the same moment. Therefore, in this embodiment, it is only necessary that the diameters of the ball heads at the ends of the first support rod 2111 and the second support rod 2112 are both less than the inner diameter of the distal member 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 connecting member 121. Thus, in order to ensure the normal operation of the deformation zone 211 of the conveying member 210, the sum of the diameters of the first support rod 2111 and the second support rod 2112 is less than the connecting member 121 of the filter 100, so as to ensure that the first support rod 2111 and the second support rod 2112 can freely pass through the distal member 131; if ball heads are provided at the ends of the first support rod 2111 and the second support rod 2112, then the sum of the diameters of the ball heads at the ends of the first support rod 2111 and the second support rod 2112 is less than the inner diameter of the connecting member 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, at this time, only one ball head passes through the distal member 131 at the same moment. Therefore, in this embodiment, the diameters of the ball heads at the ends of the first support rod 2111 and the second support rod 2112 are both less than the inner diameter of the connecting member 121 of the filter 100.

[0053] In this embodiment, when pre-assembling the filter 100 and the conveying member 210, first pass the first support rod 2111 and the second support rod 2112 through the connecting member 121 and the distal member 131 of the filter 100, and then tighten the connecting area 212 of the conveying member 210 with the connecting member 121 of the filter 100.

[0054] In another embodiment, the deformation zone 211 and the connection zone 212 are detachably connected, so that they can be assembled separately during pre-installation. Specifically, snap connection or threaded connection can be selected as the connection method. However, in the threaded structure, the helix direction of the thread needs to be opposite to that of the connection zone 212. This is because the deformation zone 211 is separated from the connection zone 212 only for the convenience of assembly, and after pre-installation, the deformation zone 211 does not need to be separated from the connection zone 212.

[0055] Embodiment 2

[0056] The improvement of Embodiment 2 relative to Embodiment 1 focuses on the conveying device itself. Specifically, referring to Figure 5 , Figure 5 is a schematic cross-sectional view of the structure of the conveying device of the filter system in Embodiment 2 of the present invention in the natural state; in this embodiment, the conveying member 210 includes an inner tube 230 and an outer tube 240 sleeved outside the inner tube 230. The deformation zone 211 is arranged at the distal end of the inner tube 230, and the connection zone 212 and the main body zone 213 are arranged at the distal end of the outer tube 240 in sequence. 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 connection zone 212, and the main body zone 213 are still the same as those 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 first used to pass the inner tube 230 from the distal end to the proximal end through the distal member 131 and the connecting member 121 of the filter 100, and 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 of the first support rod 2111 and the second support rod 2112 are respectively greater than the total length of the filter 100 in the natural state (that is, the distance from the proximal end to the distal end of the filter 100 in the natural state), so that when the conveying member 210 is withdrawn, before the distal ends of the first support rod 2111 and the second support rod 2112 pass through the distal member 131, their proximal ends have entered the inner tube 230 and are restricted by the inner tube 230. Since the inner diameter of the inner tube 230 is smaller than that of the sheath tube 200, the effect of this setting in this embodiment is better.

[0059] In another embodiment, the maximum diameters of both the first support rod 2111 and the second support rod 2112 are 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, in a situation where 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, during the corresponding release process, the distal end of the inner tube 230 needs to be axially extended through the distal member 131 first, otherwise the first support rod 2111 and the second support rod 2112 cannot pass through the distal member 131 to function.

[0060] In this embodiment, it should also be noted that the relative positions of the inner tube 230 and the outer tube 240 determine the extension amount of the deformation zone 211 relative to the distal member 131, that is, determine the amount of expansion and deformation of the deformation zone 211. Thus, if the relative positions of the inner tube 230 and the outer tube 240 are shortened and fixed, the part of the deformation zone 211 extending out of the distal member 131 will also form a limitation on the filter 100. At this time, the filter 100 is equivalent to being clamped between the distal side of the deformation zone 211 and the connection zone 212, and the clamping force is adjustable. At this time, there is no need to wait for the deformation zone 211 to contact the blood vessel wall to form a limitation on the filter 100, so that the impact on the human body reaches the minimum state. Therefore, a limit pin can be added. When the limit pin is inserted, it penetrates (that is, straddles) the inner tube 230 and the outer tube 240, and the relative axial positions of the inner tube 230 and the outer tube 240 are 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, so as to maintain the sealing performance between the inner tube 230 and the outer tube 240. To prevent the rotation of the inner tube 230 from causing the rotation of the deformation zone 211, the proximal side of the deformation zone 211 is fixed on a bearing, and the bearing is fixed to the distal end of the inner tube 230.

[0062] Embodiment 3

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

[0064] The conveying member 210 includes a binding member 250. The binding member 250 is slidably disposed outside the deformation zone 211. The position of the binding member is controlled by a rod passing through the inside of the conveying member 210. When the binding member 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 binding member 250. Also, the shape of the first support rod 2111 and the second support rod 2112 after release can be adjusted by the position of the binding member 250 to obtain a greater or smaller supporting force. In addition, when preloading, moving the binding member 250 to the distal side of the deformation zone 211 can make the distal sides of the first support rod 2111 and the second support rod 2112 substantially form a straight line, which is beneficial for the loading. In addition, when being transported in the sheath tube, the binding member staying at the distal side of the deformation zone 211 can also greatly reduce the resistance of transportation.

[0065] In this embodiment, the outer diameter of the binding member 250 is smaller than the inner diameter of the connecting member 121, so as to ensure that the binding member 250 can be freely withdrawn.

[0066] It should be noted that the technical features of the above-described embodiments can be combined arbitrarily, and can also be applied simultaneously to various filters described above and filters with similar structures. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0067] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A filter system, characterized in that, Comprising: A filter, the distal end of the filter converges to a distal member, the proximal end of the filter converges to a connecting member, and the interiors of both the connecting member and the distal member penetrate axially. A delivery device, the delivery device includes a sheath tube and a delivery member capable of moving inside the sheath tube, the delivery member includes an inner tube and an outer tube sleeved outside the inner tube, a deformation zone is provided at the distal end of the inner tube, a connection zone is provided at the distal end of the outer tube, the outer tube and the inner tube can move relatively independently, the connection zone is detachably connected to the connecting member, the deformation zone includes at least two support rods, and the distal ends of the support rods can pass through the connecting member and then pass through the distal member.

2. The filter system according to claim 1, wherein, The deformation zone includes a first support rod and a second support rod, the first support rod and the second support rod extend from the distal end of the inner tube, and in a natural state, the first support rod and the second support rod respectively extend obliquely towards the distal end.

3. The filter system according to claim 2, characterized in that, The maximum diameter of the first support rod and the maximum diameter of the second support rod are both smaller than the inner diameter of the distal member.

4. The filter system according to claim 1, wherein The distal end of the inner tube can extend axially through the distal member.

5. The filter system according to claim 2, wherein, 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 a natural state.

6. The filter system according to claim 1, characterized in that, Including a limit pin, the limit pin can span the inner tube and the outer tube.

7. The filter system according to claim 1, characterized in that, Further including a restraint member, the restraint member is slidably disposed outside the deformation zone.

8. The filter system according to claim 7, wherein, The position of the restraint member is controlled by a rod disposed inside the delivery member.

9. The filter system according to claim 7, wherein, The outer diameter of the restraint member is smaller than the inner diameter of the connecting member.

10. The filter system according to claim 1, characterized in that, The proximal side 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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