Vena cava filter delivery system

Abstract

This application discloses a vena cava filter delivery system. In this vena cava filter delivery system, by configuring the delivery channel as including a first sub-channel and a second sub-channel that are interconnected, and by configuring the first sub-channel for movement of the pushing component and the main body, and configuring the second sub-channel for movement of the anchoring part, the biodegradable vena cava filter made of biodegradable material can move stably and safely within the delivery channel, and the anchoring part will not be touched during delivery. Furthermore, since non-biodegradable vena cava filters made of metallic materials typically do not have the anchoring part compared to the biodegradable vena cava filter, this vena cava filter delivery system can also be used to deliver non-biodegradable vena cava filters.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a vena cava filter delivery system. Background Technology

[0002] A vena cava filter is a medical filter primarily used to intercept free emboli in the blood to prevent pulmonary embolism. Currently, most vena cava filters used in China are made of metal. Metal filters are divided into recyclable and permanent types. The problem with permanent filters is that long-term implantation can easily lead to complications. The problem with recyclable filters is that the long-term recovery rate is low, requiring a second surgery for retrieval. If they cannot be recovered within the specified time, they become permanent filters, causing long-term harm to the body. Therefore, biodegradable and absorbable vena cava filters are a better choice.

[0003] Degradable absorbable vena cava filters are made of degradable materials such as polydioxanone (PDO) and polylactic acid (PLA). Since these degradable materials have poor self-expansion compared to metal materials, degradable absorbable vena cava filters need to be designed with anchoring structures so that the degradable absorbable vena cava filters can be stably held in the target position. Due to the characteristics of the degradable materials themselves, the degradable anchoring structure has a large risk of deformation during transportation, which makes the existing non-degradable vena cava filter delivery system unsuitable for transporting degradable absorbable vena cava filters. Summary of the Invention

[0004] The main objective of this application is to provide a vena cava filter delivery system to solve the technical problem that there is no delivery system suitable for delivering biodegradable and absorbable vena cava filters in the prior art.

[0005] This application provides a vena cava filter delivery system, which can be used to deliver at least a biodegradable vena cava filter. The biodegradable vena cava filter includes a main body and an anchoring part, the anchoring part being located outside the main body. The vena cava filter delivery system includes:

[0006] A push component for loading, pushing, and releasing the degradable vena cava filter; A channel assembly having a delivery channel, wherein the push assembly and the biodegradable vena cava filter enter the delivery channel from the proximal end of the channel assembly and cooperate with the channel assembly to release the biodegradable vena cava filter from the distal end of the channel assembly to a designated location; The conveying channel includes a first sub-channel and at least one second sub-channel, the first sub-channel and the second sub-channel are interconnected, the first sub-channel is used for the movement of the pushing component and the main body, and the second sub-channel is used for the movement of the anchoring part.

[0007] In the embodiments of this application, the cross-section of the first sub-channel is circular, the cross-section of the second sub-channel is semi-circular, a plurality of second sub-channels are evenly distributed on the periphery of the first sub-channel, and each second sub-channel is connected to the first sub-channel. And / or, the inner wall of the main body is attached to the outer wall of the pushing assembly, the outer wall of the main body has a first distance between it and the first sub-channel wall of the first sub-channel along the radial direction of the conveying channel, and the anchoring part has a second distance between it and the second sub-channel wall of the second sub-channel along the radial direction of the conveying channel, the second distance being greater than the first distance.

[0008] In embodiments of this application, the push component includes: A balloon catheter, comprising a tube body and a balloon, wherein the balloon is disposed at the distal end of the tube body, the main body covers the periphery of the balloon, and the tube body has a first installation channel; A connecting tube, which passes through the first installation channel, has a first moving channel, and has a first clamping part at its distal end; A push-pull rod passes through the first moving channel, and the distal end of the push-pull rod has a second clamping part. The second clamping part cooperates with the first clamping part to clamp the main body. The second clamping part passes over the first clamping part and retracts into the first moving channel. The second clamping part and the first clamping part release the main body.

[0009] In the embodiments of this application, the first clamping part is in the shape of a tapered hole, and the diameter of the first clamping part gradually decreases along the direction from the distal end of the connecting pipe toward the proximal end of the connecting pipe. The second clamping part includes at least two clamping arms, each clamping arm being spaced apart at the distal end of the push-pull rod. The second clamping part has a clamping state and a released state. When the second clamping part is in the clamping state, each clamping arm is at least partially located within the first clamping part, and each clamping arm is obliquely outward to cooperate with the first clamping part to clamp the main body. When the second clamping part is in the released state, the second clamping part passes over the first clamping part and retracts into the connecting tube.

[0010] In an embodiment of this application, the vena cava filter delivery system further includes a handle, the handle comprising a first housing and a second housing, the proximal end of the balloon catheter being fixedly connected within the handle, and the proximal end of the connecting tube extending out of the balloon catheter and being clamped and fixed between the first housing and the second housing; The pushing component also includes an operating member, one end of which is connected to the proximal end of the push-pull rod extending from the connecting tube, and the other end of which extends from the proximal end of the handle. The operating member is provided with a first slot and a second slot, which are spaced apart along the length of the operating member, and the first slot is closer to the distal end of the push-pull rod. The vena cava filter delivery system further includes a first elastic positioning component, which includes a first elastic element and a first locking element. The first housing and / or the second housing have a first installation space, and the first elastic positioning component is disposed in the first installation space. When the second clamping part is in the clamping state, the first locking member is limited within the second slot; when the second clamping part is in the released state, the first locking member is limited within the first slot.

[0011] In embodiments of this application, the channel assembly is at least partially located within the handle, and at least a portion of the channel assembly is movable relative to the handle between a locked position and a released position; The handle is provided with a positioning rib. The vena cava filter delivery system also includes a locking component and a second elastic positioning component. The locking component is connected to the handle and is used to lock the channel component in the locked position. When the channel component is in the locked position, the biodegradable vena cava filter is housed in the channel component and located at the distal end of the channel component. The second elastic positioning component is connected to the channel component and located in the handle. When the channel component is in the released position, the second elastic component passes over the positioning rib and is limited to the proximal side of the positioning rib near the handle, and the biodegradable vena cava filter extends out of the channel component. The handle has a limiting groove that extends from the distal end of the handle toward the proximal end of the handle. The channel assembly includes a sheath, a first connector, a second connector, and a delivery tube. The first connector is connected between the sheath and the second connector. The proximal end of the sheath is threaded to the distal end of the first connector. The proximal end of the first connector is engaged with the distal end of the second connector, and the first connector is rotatable relative to the second connector. The second connector is located inside the handle. The delivery tube passes through the sheath, the first connector, and the second connector in sequence. The proximal end of the delivery tube is fixedly connected to the second connector, and the delivery tube defines the delivery channel. The second connector has a second mounting space, a locking groove, and a connecting arm. The second elastic positioning component is disposed in the second mounting space and can extend or retract into the second mounting space. The locking component can enter or exit the locking groove. The connecting arm can extend out of the handle through the limiting groove, or the connecting arm is connected to the pusher, and the pusher is at least partially located outside the handle.

[0012] In an embodiment of this application, the locking component includes a third connector, a fourth connector, an elastic support, and a locking member. The third connector is disposed inside the handle, the fourth connector partially passes through the handle and is connected to the third connector, the elastic support is disposed inside the third connector, and the locking member partially passes through the fourth connector, the elastic support, and the third connector. The locking member can extend out of the third connector at one end away from the fourth connector and lock in the locking groove. The third connector includes a tube, a limiting part, and a first connecting part. The limiting part is located inside the tube, and the first connecting part is located on the tube and away from the limiting part. The fourth connector includes a second connecting part, a switching guide part, and a through hole. The through hole passes through the second connecting part and the switching guide part and communicates with the tube. The second connecting part passes through the handle and is connected to the first connecting part, so that the third connector and the fourth connector are clamped on the handle. The locking member includes a locking arm and a switching arm. The locking arm passes through the through hole and has a supporting portion located between the limiting portion and the first connecting portion. The supporting portion is located on the outer periphery of the locking arm and can abut against the limiting portion on a first side near the limiting portion. The switching arm is located outside the through hole and abuts against the switching guide portion. The switching arm has a first position and a second position relative to the switching guide portion. When the switching arm is in the first position, the locking arm can extend out of the through hole and lock in the locking groove, and the channel assembly is in the locked position. When the switching arm is in the second position, the locking arm exits the locking groove and retracts into the through hole, and the channel assembly can move towards the release position. The elastic support member is elastically supported between the second connecting portion and the second side of the abutment portion away from the limiting portion, wherein the second side and the first side are the two sides opposite to the abutment portion.

[0013] In an embodiment of this application, the handle has a through hole, the proximal end of the sheath has a first threaded connection portion, the first connector includes a second threaded connection portion, a rod portion and a first snap-fit ​​portion arranged sequentially, the second threaded connection portion is located at the distal end of the first connector, the second threaded connection portion is threadedly connected to the first threaded connection portion, the first snap-fit ​​portion is located at the proximal end of the first connector, the diameters of the second threaded connection portion and the first snap-fit ​​portion are both larger than the diameter of the rod portion, and the diameters of the second threaded connection portion and the first snap-fit ​​portion are both larger than the diameter of the through hole, the rod portion passes through the through hole, the second connector has a second snap-fit ​​portion, and the second snap-fit ​​portion snaps into the first snap-fit ​​portion; Wherein, the distance between the channel assembly moving from the locked position to the released position is equal to the length of the rod, or the length of the limiting groove is equal to the length of the rod, or, when the channel assembly is in the locked position, the end face of the first locking part facing the second threaded connection part abuts against the inner end face of the distal end of the handle, and when the channel assembly is in the released position, the end face of the second threaded connection part facing the first locking part abuts against the outer end face of the distal end of the handle.

[0014] In embodiments of this application, the channel assembly further includes a guide tube and a connecting valve. The guide tube has a second moving channel, and the connecting valve has a second mounting channel and a first injection channel. The second moving channel communicates between the second mounting channel and the first moving channel. The push-pull rod passes through the first moving channel, the second moving channel, and the second mounting channel in sequence, and the proximal end of the push-pull rod extends out of the second mounting channel and connects to the operating element. The vena cava filter delivery system further includes an aspiration assembly. The tubing also has a second aspiration channel, which is not connected to the first installation channel. The two ends of the second aspiration channel are respectively connected between the first aspiration channel and the balloon. The aspiration assembly is connected to the end of the first aspiration channel away from the second aspiration channel. The aspiration assembly is used to inject fluid into the balloon to cause the balloon to expand and anchor the biodegradable vena cava filter in a designated position. The aspiration assembly is also used to aspirate the fluid from the balloon to cause the balloon to contract and adhere to the periphery of the tubing.

[0015] In an embodiment of this application, the outer wall of the tube has a limiting protrusion, the limiting protrusion is close to the distal end of the balloon catheter and located inside the balloon, and the distance by which the limiting protrusion protrudes outward along the radial direction of the tube is less than or equal to the thickness of the main body in the radial direction. When the main body covers the outer periphery of the balloon, the limiting protrusion is limited in the mesh of the main body. Alternatively, the outer wall of the tube body has a limiting protrusion, the limiting protrusion being close to the distal end of the balloon catheter and located inside the balloon, the balloon having a sleeve portion with a sleeve hole, each of the limiting protrusions being inserted into the sleeve hole of a corresponding sleeve portion, and the distance by which the limiting protrusion and the corresponding sleeve portion protrude outward along the radial direction of the tube body is less than or equal to the thickness of the main body portion along the radial direction, in the case where the main body portion covers the outer periphery of the balloon, the limiting protrusion and the corresponding sleeve portion are confined within the mesh of the main body portion.

[0016] In the vena cava filter delivery system of this application, by configuring the delivery channel as including a first sub-channel and a second sub-channel that are interconnected, and configuring the first sub-channel for the movement of the pushing component and the main body, and configuring the second sub-channel for the movement of the anchoring part, the anchoring part can always be kept in a state outside the main body during delivery within the second sub-channel. This allows the biodegradable vena cava filter made of biodegradable material to move stably and safely within the delivery channel, and the anchoring part will not be touched during delivery. This configuration effectively avoids the anchoring part being squeezed by the side wall of the delivery channel and embedded in the main body or mutually restricted by the main body during delivery, which would prevent the anchoring part made of biodegradable material from extending out of the main body by self-expansion force. This would result in the anchoring part not being effectively anchored in the designated position, leading to the risk of the biodegradable vena cava filter moving after release, thus causing surgical failure. In addition, the vena cava filter delivery system of this application can also deliver non-biodegradable vena cava filters with anchoring structures. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of a vena cava filter delivery system in one embodiment of this application.

[0018] Figure 2 This is a partial schematic diagram of a vena cava filter delivery system in one embodiment of this application.

[0019] Figure 3 This is an overall cross-sectional view of a vena cava filter delivery system in one embodiment of this application.

[0020] Figure 4 for Figure 3 Enlarged diagram of point A in the middle.

[0021] Figure 5 for Figure 3 Enlarged diagram of point B in the middle.

[0022] Figure 6 for Figure 3 Enlarged diagram of point C in the middle.

[0023] Figure 7 for Figure 3 Enlarged diagram of point D in the middle.

[0024] Figure 8 This is a cross-sectional schematic diagram of a vena cava filter delivery system in one embodiment of this application.

[0025] Figure 9 for Figure 8 Enlarged diagram of point E in the middle.

[0026] Figure 10 This is a partial cross-sectional view of a vena cava filter delivery system in one embodiment of this application.

[0027] Figure 11 This is a partial structural schematic diagram of a vena cava filter delivery system in one embodiment of this application.

[0028] Figure 12 This is an exploded view of the locking component in one embodiment of this application.

[0029] The above figures include the following reference numerals: Delivery system 100, balloon catheter 11, tube body 111, first installation channel 1111, second injection channel 1112, limiting protrusion 1113, balloon 112, sleeve part 1121, sleeve hole 1122, connecting tube 12, first moving channel 121, first clamping part 122, push-pull rod 13, second clamping part 131, clamping arm 1311, operating element 14, first slot 141, second slot 142, delivery tube 21, delivery Channel 211, First sub-channel 2111, Second sub-channel 2112, First sub-channel wall 2113, Second sub-channel wall 2114, Sheath 22, First threaded connection 221, First connector 23, Second threaded connection 231, Rod 232, First snap-fit ​​233, Second connector 24, Second mounting space 241, Second snap-fit ​​242, Locking groove 243, Connecting arm 244, Guide tube 25, Second moving channel 251 Connecting valve 26, second mounting channel 261, first injection channel 262, handle 30, first housing 31, second housing 32, first mounting space 33, positioning rib 34, limiting groove 35, through hole 36, first elastic positioning component 40, first elastic element 41, first locking element 42, locking component 50, third connecting component 51, pipe section 511, limiting part 512, first connecting part 513, fourth connecting component 52, second connecting part 521 The components include: a switching guide 522, a first limiting groove 5221, a second limiting groove 5222, a through hole 523, an elastic support 53, a locking member 54, a locking arm 541, a supporting part 5411, a switching arm 542, a second elastic positioning assembly 60, a second elastic member 61, a second locking member 62, a pushing member 70, an injection assembly 80, a biodegradable vena cava filter 200, a main body 210, a converging end 2101, a mesh 2102, and an anchoring part 220. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] Please see Figure 1-7 As shown, this application provides a vena cava filter delivery system 100, which can be used to deliver at least a biodegradable vena cava filter 200. The biodegradable vena cava filter 200 includes a main body 210 and an anchoring part 220. The main body 210 is used to intercept thrombi that break off in the vein, preventing the thrombi from entering the pulmonary artery with the blood flow and causing pulmonary embolism. The anchoring part 220 is located outside the main body 210. The anchoring part 220 is used to anchor the biodegradable vena cava filter 200 to the inner wall of the blood vessel corresponding to the designated location when the biodegradable vena cava filter 200 is delivered to the designated location, so that the biodegradable vena cava filter 200 can be stably maintained in the designated location to facilitate effective interception of thrombi.

[0034] In an embodiment of this application, the vena cava filter delivery system 100 includes a pushing component and a channel component. The pushing component is used to load, push, and release the biodegradable vena cava filter 200; the channel component has a delivery channel 211, through which the pushing component and the biodegradable vena cava filter 200 enter the delivery channel 211 from the proximal end of the channel component, and cooperate with the channel component to release the biodegradable vena cava filter 200 from the distal end of the channel component to a designated location.

[0035] Please see Figure 8 As shown, the conveying channel 211 includes a first sub-channel 2111 and at least one second sub-channel 2112. The first sub-channel 2111 and the second sub-channel 2112 are interconnected. The first sub-channel 2111 is used for the movement of the pushing component and the main body 210, and the second sub-channel 2112 is used for the movement of the anchoring part 220.

[0036] By configuring the delivery channel 211 to include a first sub-channel 2111 and a second sub-channel 2112 that are interconnected, and configuring the first sub-channel 2111 for movement of the pushing component and the main body 210, and configuring the second sub-channel 2112 for movement of the anchoring part 220, the anchoring part 220 can always be maintained in a state outside the main body 210 during delivery within the second sub-channel 2112, thereby enabling the biodegradable vena cava filter 200 made of biodegradable material to be stable and safe. The anchoring part 220 moves within the delivery channel 211 and is not touched during delivery. This arrangement effectively prevents the anchoring part 220 from being squeezed by the side wall of the delivery channel 211 and embedded in the main body 210 or mutually restricted by the main body 210 during delivery. This would prevent the anchoring part 220, made of biodegradable material, from extending out of the main body 210 by its self-expansion force, thus preventing the anchoring part 220 from being effectively anchored in the designated position. Consequently, there is a risk that the biodegradable vena cava filter 200 may move after release, leading to surgical failure.

[0037] In addition, the vena cava filter delivery system 100 of this application can also deliver non-degradable vena cava filters 200 with anchoring structures.

[0038] Please see Figure 8 As shown in the embodiments of this application, both the first sub-channel 2111 and the second sub-channel 2112 extend along the length direction of the conveying channel 211. The cross-sections of the first sub-channel 2111 and the second sub-channel 2112 are planes perpendicular to the length direction of the conveying channel 211. The cross-section of the first sub-channel 2111 is circular to fit the cylindrical main body 210, so that the main body 210 can be effectively and stably housed inside the first sub-channel 2111. The cross-section of the second sub-channel 2112 is semi-circular. A plurality of second sub-channels 2112 are evenly distributed around the periphery of the first sub-channel 2111, and each second sub-channel 2112 is connected to the first sub-channel 2111, thereby enabling each anchoring part 220 to move safely within its corresponding second sub-channel 2112.

[0039] Please see Figure 8As shown in the embodiment of this application, the inner wall of the main body 210 is attached to the outer wall of the push component. That is to say, the main body 210, which has not yet expanded, is attached to the outer wall of the push component and is located near the far end of the push component. The outer wall of the main body 210 has a first gap with the first sub-channel wall 2113 of the first sub-channel 2111 along the radial direction of the conveying channel 211, and the anchoring part 220 has a second gap with the second sub-channel wall 2114 of the second sub-channel 2112 along the radial direction of the conveying channel 211. The second gap is greater than the first gap, so that before the biodegradable vena cava filter 200 is expanded, the main body 210 is restricted by the first sub-channel wall 2113, which allows the anchoring part 220 to contact the second sub-channel wall 2114. This ensures that the anchoring part 220 can maintain a preset shape, thereby avoiding deformation of the anchoring part 220 due to contact with the second sub-channel wall 2114 during the conveying process, which would affect the anchoring effect of the anchoring part 220.

[0040] Please see Figure 1-8 As shown in the embodiments of this application, the pushing component includes a balloon catheter 11, a connecting tube 12, and a push-pull rod 13. The connecting tube 12 passes through the balloon catheter 11 and remains relatively stationary with respect to the balloon catheter 11. The push-pull rod 13 passes through the connecting tube 12 and is movable relative to the connecting tube 12 along the axial direction of the connecting tube 12 (the axial direction is the length direction of the push-pull rod 13).

[0041] The balloon catheter 11 includes a tube body 111 and a balloon 112. The balloon 112 is disposed on the tube body 111 and close to the distal end of the tube body 111. When the main body 210 is not inflated, the main body 210 covers the periphery of the balloon 112 so that the main body 210 can inflate and expand together with the balloon 112 when the balloon 112 is inflated.

[0042] The tube body 111 has a first installation channel 1111, the connecting tube 12 passes through the first installation channel 1111, the connecting tube 12 has a first moving channel 121, and the distal end of the connecting tube 12 has a first clamping part 122. The push-pull rod 13 passes through the first moving channel 121, and the distal end of the push-pull rod 13 has a second clamping part 131. The second clamping part 131 cooperates with the first clamping part 122 to clamp the main body 210. Specifically, the first clamping part 122 and the second clamping part 131 cooperate to clamp the converging end 2101 of the main body 210, thereby allowing the biodegradable cavity to remain still. The vena cava filter 200 can be mounted on the push assembly, which can effectively prevent the biodegradable vena cava filter 200 from falling off the push assembly. When the second clamping part 131 passes over the first clamping part 122 and retracts into the first moving channel 121, the main body 210 is no longer clamped by the first clamping part 122 and the second clamping part 131, thereby allowing the second clamping part 131 and the first clamping part 122 to release the main body 210, so that the biodegradable vena cava filter 200 can expand and unfold under the action of the inflating balloon 112 and anchor the anchoring part 220 in the designated position.

[0043] Please see Figure 2-3 As shown in the embodiments of this application, the first clamping part 122 is in the shape of a tapered hole, and the diameter of the first clamping part 122 gradually decreases along the direction from the distal end of the connecting pipe 12 toward the proximal end of the connecting pipe 12; the second clamping part 131 includes at least two clamping arms 1311, each of the clamping arms 1311 being spaced apart at the distal end of the push-pull rod 13, and the second clamping part 131 has a clamping state and a releasing state.

[0044] When the second clamping part 131 is in the clamping state, each clamping arm 1311 is at least partially located within the first clamping part 122, and each clamping arm 1311 is obliquely outward to cooperate with the first clamping part 122 to clamp the main body part 210. Each clamping arm 1311 can be a rigid structure or an elastic structure, which is not specifically limited here, and each clamping arm 1311 is obliquely outward in the direction from the proximal end of the push-pull rod 13 to the distal end of the push-pull rod 13.

[0045] When the second clamping part 131 is in the released state, the second clamping part 131 passes over the first clamping part 122 and retracts into the connecting tube 12. That is, the push-pull rod 13 moves along the far end of the connecting tube 12 towards the near end of the connecting tube 12, and each clamping arm 1311 moves radially inward simultaneously so that the second clamping part 131 passes over the first clamping part 122 and retracts into the connecting tube 12, thereby releasing the main body 210.

[0046] Please see Figure 1 , Figure 3 , Figure 10-11 As shown in the embodiments of this application, the vena cava filter delivery system 100 further includes a handle 30. The push assembly and the channel assembly are respectively connected to the handle 30.

[0047] The handle 30 includes a first housing 31 and a second housing 32, which are detachably connected. The proximal end of the balloon catheter 11 is fixedly connected within the handle 30, and the proximal end of the connecting tube 12 extends out of the balloon catheter 11 and is clamped and fixed between the first housing 31 and the second housing 32, thereby keeping both the balloon catheter 11 and the connecting tube 12 fixedly connected to the handle 30 and relatively stationary.

[0048] Please see Figure 1 , Figure 4 , Figure 10-11 As shown, the pushing component also includes an operating member 14. One end of the operating member 14 is connected to the proximal end of the push-pull rod 13 extending from the connecting tube 12, and the other end of the operating member 14 extends from the proximal end of the handle 30. The operating member 14 is provided with a first slot 141 and a second slot 142, which are spaced apart along the length of the operating member 14. The first slot 141 is closer to the distal end of the push-pull rod 13, and the second slot 142 is farther away from the distal end of the push-pull rod 13.

[0049] Please see Figure 4As shown, the vena cava filter delivery system 100 further includes a first elastic positioning component 40, which includes a first elastic element 41 and a first locking element 42. At least one of the first housing 31 and the second housing 32 has a first installation space 33. The first elastic element 41 is disposed in the first installation space 33. The first locking element 42 is kept partially extended out of the first installation space 33 under the elastic resistance of the first elastic element 41. When the first locking element 42 is subjected to resistance, the first locking element 42 can squeeze the first elastic element 41 and retract into the first installation space 33.

[0050] When the second clamping part 131 is in the clamping state, the first locking member 42 is limited within the second slot 142, thereby preventing the operating member 14 from being accidentally touched, causing the push-pull rod 13 to move axially. This ensures that the second clamping part 131 can cooperate with the first clamping part 122 to stably clamp the main body 210. When the second clamping part 131 is in the released state, the first locking member 42 is limited within the first slot 141. At this time, the second clamping part 131 retracts into the connecting tube 12. By using the first locking member 42 to limit the push-pull rod 13 within the first slot 141, the operator (who may be the surgeon) can avoid manually controlling the operating member 14 to keep the push-pull rod 13 in the released position, so that the operator can perform other surgical operations.

[0051] Please see Figure 4 As shown in the embodiments of this application, two first mounting spaces 33 may be provided on the first housing 31 or the second housing 32. Each first mounting space 33 is provided with a first elastic positioning component 40. When the second clamping part 131 is in the clamping state, one of the first elastic positioning components 40 is limited in the first slot 141, and the other first elastic positioning component 40 is limited in the second slot 142.

[0052] In the embodiments of this application, the first elastic positioning component 40 can be a ball bearing. By setting the first elastic positioning component 40 to cooperate with the first slot 141 and the second slot 142 to position the push-pull rod 13, the operator can quickly determine whether the push-pull rod 13 has moved to the designated position by using the jolt and limit sensation emitted when the first locking member 42 enters the first slot 141 and the second slot 142.

[0053] Please see Figure 2-3As shown, in an embodiment of this application, the channel assembly is at least partially located within the handle 30, and at least a portion of the channel assembly is movable relative to the handle 30 between a locked position and a released position, such that the channel assembly can move towards the proximal end of the handle 30 to expose the degradable vena cava filter 200 at the distal end of the push assembly in a designated location.

[0054] The handle 30 is provided with a positioning rib 34, which is located near the proximal end of the handle 30. The vena cava filter delivery system 100 also includes a locking component 50 and a second elastic positioning component 60. The locking component 50 is connected to the handle 30 and is used to lock the channel component in the locked position. The second elastic positioning component 60 is connected to the channel component and is located within the handle 30. The second elastic positioning component 60 is used to limit the channel component to the released position.

[0055] When the channel assembly is in the locked position, the biodegradable vena cava filter 200 is housed within the channel assembly and located at the distal end of the channel assembly, and at this time, the biodegradable vena cava filter 200 is not exposed outside the channel assembly; when the channel assembly is in the released position, the second elastic component passes over the positioning rib 34 and is limited to the proximal side of the positioning rib 34 near the handle 30, and at this time, the biodegradable vena cava filter 200 extends out of the channel assembly and is exposed at the designated position.

[0056] Please see Figure 3 As shown in the embodiment of this application, the second connector 24 has a second mounting space 241, and the second elastic positioning component 60 is disposed in the second mounting space 241. The second elastic positioning component 60 includes a second elastic member 61 and a second locking member 62. The second elastic member 61 is disposed in the second mounting space 241, and the second locking member 62 is kept partially extended out of the second mounting space 241 under the elastic resistance of the second elastic member 61. When the second locking member 62 is subjected to resistance, the second locking member 62 can squeeze the second elastic member 61 and retract into the second mounting space 241.

[0057] Please see Figure 1 and Figure 3-9 ,as well as Figure 11 As shown, in an embodiment of this application, the handle 30 has a limiting groove 35, which extends along the distal end of the handle 30 toward the proximal end of the handle 30, such that the limiting groove 35 is an elongated hole.

[0058] The channel assembly includes a sheath 22, a first connector 23, a second connector 24, and a delivery tube 21. The first connector 23 is connected between the sheath 22 and the second connector 24. The proximal end of the sheath 22 is threadedly connected to the distal end of the first connector 23, and the proximal end of the first connector 23 is engaged with the distal end of the second connector 24. The first connector 23 is rotatable relative to the second connector 24, so that the first connector 23 and the second connector 24 maintain a substantially relative position along the axial direction, meaning that the first connector 23 and the second connector 24 will not move relative to each other along the axial direction. Simultaneously, the movement of the first connector 23 relative to the second connector 24 facilitates the sheath 22's passage through the guide wire. In the case of establishing a treatment pathway, the sheath 22 remains stationary and is threadedly connected to the first connector 23 by rotating the first connector 23. The second connector 24 is located inside the handle 30. The delivery tube 21 passes through the sheath 22, the first connector 23, and the second connector 24 in sequence. The proximal end of the delivery tube 21 is fixedly connected to the second connector 24 so that the movement of the second connector 24 along the axial direction can drive the first connector 23, the sheath 22, and the delivery tube 21 to move synchronously. The delivery tube 21 defines and forms the delivery channel 211.

[0059] Please see Figure 1 , Figure 3 , Figure 7 and Figure 11-12 As shown, the second connector 24 also has a locking groove 243 and a connecting arm 244. The locking component 50 can enter or exit the locking groove 243. When the locking component 50 enters the locking groove 243, the locking component 50 locks the second connector 24, so that the second connector 24 and the handle 30 remain relatively stationary, that is, the second connector 24 cannot move relative to the handle 30 in the axial direction. This ensures that the first connector 23, the sheath 22, and the delivery tube 21 all remain relatively stationary relative to the handle 30. Arm 244 can extend beyond the handle 30 through the limiting slide groove 35, thereby causing the second connector 24 to move along the limiting slide groove 35, which in turn causes the first connector 23, the sheath 22, and the delivery pipe 21 to move synchronously; or, the connecting arm 244 is connected to the pusher 70, and the pusher 70 is at least partially located outside the handle 30, so that by operating the pusher 70, the second connector 24 can be moved along the limiting slide groove 35, which in turn causes the first connector 23, the sheath 22, and the delivery pipe 21 to move synchronously.

[0060] In an embodiment of this application, the locking assembly 50 includes a third connector 51, a fourth connector 52, an elastic support 53, and a locking member 54. The third connector 51 is disposed within the handle 30. The fourth connector 52 partially passes through the handle 30 and connects to the third connector 51, thereby fixing the third connector 51 and the fourth connector 52 to the handle 30. The elastic support 53 is disposed within the third connector 51. The locking member 54 partially passes through the fourth connector 52, the elastic support 53, and the third connector 51, and the locking member 54 can extend out of the third connector 51 away from the fourth connector 52 and lock in the locking groove 243, thereby locking the second connector 24, the first connector 23, the sheath 22, and the delivery tube 21 and keeping them relatively stationary with respect to the handle 30.

[0061] The third connector 51 includes a tube 511, a limiting part 512, and a first connecting part 513. The limiting part 512 is disposed inside the tube 511, and the first connecting part 513 is disposed on the tube 511 and away from the limiting part 512. The fourth connector 52 includes a second connecting part 521, a switching guide part 522, and a through hole 523. The through hole 523 passes through the second connecting part 521 and the switching guide part 522 and communicates with the tube 511. The second connecting part 521 passes through the handle 30 and is connected to the first connecting part 513, so that the third connector 51 and the fourth connector 52 are clamped on the handle 30, and at the same time, the third connector 51 and the fourth connector 52 are fixedly connected to the handle 30.

[0062] The locking member 54 includes a locking arm 541 and a switching arm 542. The locking arm 541 passes through the through hole 523 and has a supporting portion 5411. The supporting portion 5411 is located between the limiting portion 512 and the first connecting portion 513. The supporting portion 5411 is located on the outer periphery of the locking arm 541 and can abut against the limiting portion 512 on a first side near the limiting portion 512. The switching arm 542 is located outside the through hole 523 and abuts against the switching guide portion 522. The switching arm 542 has a first position and a second position relative to the switching guide portion 522. When the first position is reached, the locking arm 541 extends out of the through hole 523 and locks in the locking groove 243. The channel assembly is in the locked position, and the second connector 24, the first connector 23, the sheath 22, and the delivery tube 21 are locked and remain relatively stationary with respect to the handle 30. When the switching arm 542 is in the second position, the locking arm 541 exits the locking groove 243 and retracts into the through hole 523. The pusher 70 can drive the channel assembly to the release position so that the biodegradable vena cava filter 200 is exposed outside the channel assembly.

[0063] Please see Figure 7 As shown, the elastic support 53 is elastically supported between the second connecting portion 521 and the second side of the abutment portion 5411 away from the limiting portion 512. The elastic support 53 is used to apply a force to the locking member 54 to lock the locking arm 541 in the locking groove 243. The second side and the first side are the two sides opposite to the abutment portion 5411.

[0064] Please see Figure 7 and Figure 12 As shown in the embodiment of this application, the locking member 54 rotates 180 degrees relative to the fourth connecting member 52 to allow the switching arm 542 to switch between the first position and the second position relative to the switching guide 522. The switching guide 522 is provided with a first limiting groove 5221 at the first position and a second limiting groove 5222 at the second position, so that the switching arm 542 can be stably held in the first limiting groove 5221 when it is in the first position and stably held in the second limiting groove 5222 when it is in the second position, thereby avoiding accidental activation.

[0065] When the switching arm 542 is in the first position, the switching arm 542 is at least partially limited above the pusher 70, and the pusher 70 cannot be manipulated to slide along the limiting groove 35.

[0066] In the embodiments of this application, the first connecting part 513 and the second connecting part 521 may be threaded to facilitate the assembly and disassembly of the third connecting member 51 and the fourth connecting member 52; or, the first connecting part 513 and the second connecting part 521 may be rotatably snapped together; or, the first connecting part 513 and the second connecting part 521 may be plugged together, which is not specifically limited here.

[0067] Please see Figure 1 , Figure 3 and Figure 10-11 As shown in the embodiment of this application, the handle 30 has a through hole 36, which is jointly defined by the first housing 31 and the second housing 32. The proximal end of the sheath 22 has a first threaded connection portion 221. The first connector 23 includes a second threaded connection portion 231, a rod portion 232, and a first snap-fit ​​portion 233 arranged sequentially. The second threaded connection portion 231 is located at the distal end of the first connector, and is threadedly connected to the first threaded connection portion 221, facilitating the assembly and disassembly of the sheath 22 and the first connector 23. The first snap-fit ​​portion 233 is located at the proximal end of the first connector 23. The diameters of both the second threaded connection portion 231 and the first snap-fit ​​portion 233 are larger than the rod portion 221. The diameter of the through hole 36, as well as the diameters of the second threaded connection 231 and the first snap-fit ​​233, are all larger than the diameter of the through hole 36, so that the second threaded connection 231 cannot pass through the through hole 36 to enter the handle 30, and the first snap-fit ​​233 cannot pass through the through hole 36 to extend out of the handle 30. The rod portion 232 passes through the through hole 36. The second connector 24 has a second snap-fit ​​portion 242, which snaps with the first snap-fit ​​portion 233, so that the first connector 23 and the second connector 24 are locked in place.

[0068] In an embodiment of this application, the distance between the channel assembly moving from the locked position to the released position is equal to the length of the rod portion 232. Thus, when the second locking member 62 passes over the positioning rib 34 and is limited to the side of the positioning rib 34 near the proximal end of the handle 30, one end of the second threaded connection portion 231 facing the first locking portion 233 abuts against the outer end face of the distal end of the handle 30. When the locking arm 541 is locked in the locking groove 243, one end of the first locking portion 233 facing the second threaded connection portion 231 abuts against the inner end face of the distal end of the handle 30.

[0069] In the embodiments of this application, the length of the limiting slide 35 is equal to the length of the rod portion 232. When the channel assembly is in the locked position, the end face of the first engaging portion 233 facing the second threaded connection portion 231 abuts against the inner end face of the distal end of the handle 30, and the connecting arm 244 abuts against the groove wall at the distal end of the limiting slide 35. When the channel assembly is in the released position, the end face of the second threaded connection portion 231 facing the first engaging portion 233 abuts against the outer end face of the distal end of the handle 30, and the connecting arm 244 abuts against the groove wall at the proximal end of the limiting slide 35.

[0070] Please see Figure 11-12 As shown in the embodiments of this application, the channel assembly further includes a guide tube 25 and a connecting valve 26. The guide tube 25 is made of a rigid material, for example, a metal material, and has a second moving channel 251. The connecting valve 26 has a second mounting channel 261 and a first injection channel 262. The second moving channel 251 connects the second mounting channel 261 and the first moving channel 121. The push-pull rod 13 passes sequentially through the first moving channel 121, the second moving channel 251, and the second mounting channel 261, with the proximal end of the push-pull rod 13 extending out of the second mounting channel 261 and connecting to the operating member 14. During the movement of the delivery tube 21 toward the proximal end of the handle 30, the delivery tube 21 moves along the outer wall of the guide tube 25, and the rigidity of the guide tube 25 allows the delivery tube 21 to move smoothly and stably.

[0071] Please see Figure 1 As shown, the vena cava filter delivery system 100 further includes an injection assembly 80. The tubing 111 also has a second injection channel 1112, which is not connected to the first installation channel 1111. The two ends of the second injection channel 1112 are respectively connected between the first injection channel 262 and the balloon 112. The injection assembly 80 is connected to the end of the first injection channel 262 away from the second injection channel 1112. The injection assembly 80 is used to inject fluid into the balloon 112 to expand the balloon 112 and anchor the biodegradable vena cava filter 200 in a designated position. The injection assembly 80 is also used to remove the fluid from the balloon 112 to contract the balloon 112 and attach it to the outer periphery of the tubing 111, thereby realizing the expansion and contraction of the balloon 112.

[0072] Please see Figure 8As shown in the embodiment of this application, the outer wall of the tube body 111 has a limiting protrusion 1113. The limiting protrusion 1113 is close to the distal end of the balloon catheter 11 and located inside the balloon 112. The distance by which the limiting protrusion 1113 protrudes outward along the radial direction of the tube body 111 is less than or equal to the thickness of the main body 210 along the radial direction. When the main body 210 covers the outer periphery of the balloon 112, the limiting protrusion 1113 is limited in the mesh 2102 of the main body 210.

[0073] By setting the limiting protrusion 1113, the main body 210 will not move axially or circumferentially relative to the balloon catheter 11 under the limiting action of the limiting protrusion 1113, so that the anchoring part 220 will not touch the inner wall of the delivery channel 211, thereby ensuring that the anchoring part 220 can maintain the preset shape and be effectively anchored at the designated position.

[0074] Please participate Figure 9 As shown in the embodiment of this application, the outer wall of the tube body 111 has a limiting protrusion 1113. The limiting protrusion 1113 is close to the distal end of the balloon catheter 11 and located inside the balloon 112. The balloon 112 has a sleeve portion 1121 and a sleeve hole 1122. Each limiting protrusion 1113 is inserted into the sleeve hole 1122 of a corresponding sleeve portion 1121. The distance between the limiting protrusion 1113 and the corresponding sleeve portion 1121 protruding outward along the radial direction of the tube body 111 is less than or equal to the thickness of the main body portion 210 along the radial direction. When the main body portion 210 covers the outer periphery of the balloon 112, the limiting protrusion 1113 and the corresponding sleeve portion 1121 are limited in the mesh 2102 of the main body portion 210.

[0075] By setting the limiting protrusion 1113 and the sleeve 1121, the main body 210 will not move axially or circumferentially relative to the balloon catheter 11 under the limiting action of the limiting protrusion 1113, so that the anchoring part 220 will not touch the inner wall of the delivery channel 211, thereby ensuring that the anchoring part 220 can maintain the preset shape and be effectively anchored at the designated position.

[0076] Please see Figure 1-12As shown in the embodiments of this application, the vena cava filter delivery system 100 further includes a guidewire. The guidewire is used to establish a treatment pathway. The distal end of the sheath 22 is fitted onto the guidewire from the proximal end and moves along the guidewire until the distal end of the sheath 22 reaches a designated position. Then, the guidewire is withdrawn from the sheath 22. Next, the distal end of the push assembly carrying the biodegradable vena cava filter 200 enters the sheath 22 from the proximal end. After guiding the distal end of the push assembly to the designated position, the inlet end of the sheath 22 is threadedly connected to the distal end of the first connecting tube 12. Then, the locking member 54 is released, and the first connecting member 23, the second connecting member 24, the sheath 22, and the delivery tube 21 are moved from the locked position to the released position, thereby exposing the biodegradable vena cava filter 200 outside the sheath 22. Then, fluid (such as saline) is injected into the balloon 112 to inflate the balloon 112 and expand the biodegradable vena cava filter 200 until the anchoring part 220 is anchored in the designated position. After injecting a preset amount of fluid into the balloon 112 and maintaining pressure for 2 to 3 minutes, the fluid in the balloon 112 is withdrawn. At this time, the delivery system 100 can be gently moved to confirm whether the biodegradable vena cava filter 200 is stably anchored in the designated position. After confirming stable anchoring, the push-pull rod 13 is pulled back so that the second clamping part 131 retracts into the connecting tube 12, thereby releasing the biodegradable vena cava filter 200. Finally, the delivery system 100 is withdrawn to complete the delivery and release of the biodegradable vena cava filter 200.

[0077] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0078] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0079] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vena cava filter delivery system, characterized in that, The vena cava filter delivery system is at least capable of delivering a biodegradable vena cava filter, the biodegradable vena cava filter comprising a body portion and an anchoring portion located outside the body portion, the vena cava filter delivery system comprising: A push component for loading, pushing, and releasing the degradable vena cava filter; A channel assembly having a delivery channel, wherein the push assembly and the biodegradable vena cava filter enter the delivery channel from the proximal end of the channel assembly and cooperate with the channel assembly to release the biodegradable vena cava filter from the distal end of the channel assembly to a designated location; The conveying channel includes a first sub-channel and at least one second sub-channel, the first sub-channel and the second sub-channel are interconnected, the first sub-channel is used for the movement of the pushing component and the main body, and the second sub-channel is used for the movement of the anchoring part.

2. The vena cava filter delivery system according to claim 1, characterized in that, The first sub-channel has a circular cross-section, the second sub-channel has a semi-circular cross-section, and multiple second sub-channels are evenly distributed around the periphery of the first sub-channel, with each second sub-channel communicating with the first sub-channel. And / or, the inner wall of the main body is attached to the outer wall of the pushing assembly, the outer wall of the main body has a first distance between it and the first sub-channel wall of the first sub-channel along the radial direction of the conveying channel, and the anchoring part has a second distance between it and the second sub-channel wall of the second sub-channel along the radial direction of the conveying channel, the second distance being greater than the first distance.

3. The vena cava filter delivery system according to claim 1, characterized in that, The push component includes: A balloon catheter, comprising a tube body and a balloon, wherein the balloon is disposed at the distal end of the tube body, the main body covers the periphery of the balloon, and the tube body has a first installation channel; A connecting tube, which passes through the first installation channel, has a first moving channel, and has a first clamping part at its distal end; A push-pull rod passes through the first moving channel, and the distal end of the push-pull rod has a second clamping part. The second clamping part cooperates with the first clamping part to clamp the main body. The second clamping part passes over the first clamping part and retracts into the first moving channel. The second clamping part and the first clamping part release the main body.

4. The vena cava filter delivery system according to claim 3, characterized in that, The first clamping part is tapered, and the diameter of the first clamping part gradually decreases along the direction from the distal end of the connecting tube toward the proximal end of the connecting tube. The second clamping part includes at least two clamping arms, each clamping arm being spaced apart at the distal end of the push-pull rod. The second clamping part has a clamping state and a released state. When the second clamping part is in the clamping state, each clamping arm is at least partially located within the first clamping part, and each clamping arm is obliquely outward to cooperate with the first clamping part to clamp the main body. When the second clamping part is in the released state, the second clamping part passes over the first clamping part and retracts into the connecting tube.

5. The vena cava filter delivery system according to claim 4, characterized in that, The vena cava filter delivery system also includes a handle, which includes a first housing and a second housing. The proximal end of the balloon catheter is fixedly connected to the handle, and the proximal end of the connecting tube extends out of the balloon catheter and is clamped and fixed between the first housing and the second housing. The pushing component also includes an operating member, one end of which is connected to the proximal end of the push-pull rod extending from the connecting tube, and the other end of which extends from the proximal end of the handle. The operating member is provided with a first slot and a second slot, which are spaced apart along the length of the operating member, and the first slot is closer to the distal end of the push-pull rod. The vena cava filter delivery system further includes a first elastic positioning component, which includes a first elastic element and a first locking element. The first housing and / or the second housing have a first installation space, and the first elastic positioning component is disposed in the first installation space. When the second clamping part is in the clamping state, the first locking member is limited within the second slot; when the second clamping part is in the released state, the first locking member is limited within the first slot.

6. The vena cava filter delivery system according to claim 5, characterized in that, The channel assembly is at least partially located within the handle, and at least a portion of the channel assembly is movable relative to the handle between a locked position and a released position; The handle is provided with a positioning rib. The vena cava filter delivery system also includes a locking component and a second elastic positioning component. The locking component is connected to the handle and is used to lock the channel component in the locked position. When the channel component is in the locked position, the biodegradable vena cava filter is housed in the channel component and located at the distal end of the channel component. The second elastic positioning component is connected to the channel component and located in the handle. When the channel component is in the released position, the second elastic component passes over the positioning rib and is limited to the proximal side of the positioning rib near the handle, and the biodegradable vena cava filter extends out of the channel component. The handle has a limiting groove that extends from the distal end of the handle toward the proximal end of the handle. The channel assembly includes a sheath, a first connector, a second connector, and a delivery tube. The first connector is connected between the sheath and the second connector. The proximal end of the sheath is threaded to the distal end of the first connector. The proximal end of the first connector is engaged with the distal end of the second connector, and the first connector is rotatable relative to the second connector. The second connector is located inside the handle. The delivery tube passes through the sheath, the first connector, and the second connector in sequence. The proximal end of the delivery tube is fixedly connected to the second connector, and the delivery tube defines the delivery channel. The second connector has a second mounting space, a locking groove, and a connecting arm. The second elastic positioning component is disposed in the second mounting space and can extend or retract into the second mounting space. The locking component can enter or exit the locking groove. The connecting arm can extend out of the handle through the limiting groove, or the connecting arm is connected to the pusher, and the pusher is at least partially located outside the handle.

7. The vena cava filter delivery system according to claim 6, characterized in that, The locking assembly includes a third connector, a fourth connector, an elastic support, and a locking member. The third connector is disposed inside the handle. The fourth connector partially passes through the handle and is connected to the third connector. The elastic support is disposed inside the third connector. The locking member partially passes through the fourth connector, the elastic support, and the third connector. The locking member can extend out of the third connector at one end away from the fourth connector and lock in the locking groove. The third connector includes a tube, a limiting part, and a first connecting part. The limiting part is located inside the tube, and the first connecting part is located on the tube and away from the limiting part. The fourth connector includes a second connecting part, a switching guide part, and a through hole. The through hole passes through the second connecting part and the switching guide part and communicates with the tube. The second connecting part passes through the handle and is connected to the first connecting part, so that the third connector and the fourth connector are clamped on the handle. The locking member includes a locking arm and a switching arm. The locking arm passes through the through hole and has a supporting portion located between the limiting portion and the first connecting portion. The supporting portion is located on the outer periphery of the locking arm and can abut against the limiting portion on a first side near the limiting portion. The switching arm is located outside the through hole and abuts against the switching guide portion. The switching arm has a first position and a second position relative to the switching guide portion. When the switching arm is in the first position, the locking arm can extend out of the through hole and lock in the locking groove, and the channel assembly is in the locked position. When the switching arm is in the second position, the locking arm exits the locking groove and retracts into the through hole, and the channel assembly can move towards the release position. The elastic support member is elastically supported between the second connecting portion and the second side of the abutment portion away from the limiting portion, wherein the second side and the first side are the two sides opposite to the abutment portion.

8. The vena cava filter delivery system according to claim 6, characterized in that, The handle has a through hole, and the proximal end of the sheath has a first threaded connection. The first connector includes a second threaded connection, a rod, and a first snap-fit ​​part arranged sequentially. The second threaded connection is located at the distal end of the first connector and is threadedly connected to the first threaded connection. The first snap-fit ​​part is located at the proximal end of the first connector. The diameters of the second threaded connection and the first snap-fit ​​part are both larger than the diameter of the rod and the diameters of the second threaded connection and the first snap-fit ​​part are both larger than the diameter of the through hole. The rod passes through the through hole, and the second connector has a second snap-fit ​​part that snaps into the first snap-fit ​​part. Wherein, the distance between the channel assembly moving from the locked position to the released position is equal to the length of the rod, or the length of the limiting groove is equal to the length of the rod, or, when the channel assembly is in the locked position, the end face of the first locking part facing the second threaded connection part abuts against the inner end face of the distal end of the handle, and when the channel assembly is in the released position, the end face of the second threaded connection part facing the first locking part abuts against the outer end face of the distal end of the handle.

9. The vena cava filter delivery system according to claim 5, characterized in that, The channel assembly further includes a guide tube and a connecting valve. The guide tube has a second moving channel, and the connecting valve has a second mounting channel and a first injection channel. The second moving channel communicates between the second mounting channel and the first moving channel. The push-pull rod passes through the first moving channel, the second moving channel, and the second mounting channel in sequence, and the proximal end of the push-pull rod extends out of the second mounting channel and connects to the operating element. The vena cava filter delivery system further includes an aspiration assembly. The tubing also has a second aspiration channel, which is not connected to the first installation channel. The two ends of the second aspiration channel are respectively connected between the first aspiration channel and the balloon. The aspiration assembly is connected to the end of the first aspiration channel away from the second aspiration channel. The aspiration assembly is used to inject fluid into the balloon to cause the balloon to expand and anchor the biodegradable vena cava filter in a designated position. The aspiration assembly is also used to aspirate the fluid from the balloon to cause the balloon to contract and adhere to the periphery of the tubing.

10. The vena cava filter delivery system according to claim 3, characterized in that, The outer wall of the tube has a limiting protrusion, which is close to the distal end of the balloon catheter and located inside the balloon. The distance by which the limiting protrusion protrudes outward along the radial direction of the tube is less than or equal to the thickness of the main body in the radial direction. When the main body covers the outer periphery of the balloon, the limiting protrusion is limited in the mesh of the main body. Alternatively, the outer wall of the tube body has a limiting protrusion, the limiting protrusion being close to the distal end of the balloon catheter and located inside the balloon, the balloon having a sleeve portion with a sleeve hole, each of the limiting protrusions being inserted into the sleeve hole of a corresponding sleeve portion, and the distance by which the limiting protrusion and the corresponding sleeve portion protrude outward along the radial direction of the tube body is less than or equal to the thickness of the main body portion along the radial direction, in the case where the main body portion covers the outer periphery of the balloon, the limiting protrusion and the corresponding sleeve portion are confined within the mesh of the main body portion.

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