Absorbable vascular plug

Abstract

The present invention relates to an absorbable vascular plug, which comprises a occluding frame and a spiral coil arranged in the occluding frame, wherein the occluding frame and the spiral coil are both made of absorbable material, the spiral coil extends axially, and when the absorbable vascular plug is released from a delivery sheath, the spiral coil abuts against the inner surface of the occluding frame. The absorbable vascular plug has good radial support performance, which is conducive to better resisting the impact of blood flow, thereby improving the safety of use.

Description

Technical Field

[0001] The invention relates to the field of interventional medical devices, and in particular to an absorbable vascular plug. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Traditional vascular plugs are generally made of shape memory alloys, which have good elasticity, can restore their original shape after release, and fit well with the tissue of the defect. However, the current shape memory alloy materials are generally non-corrosive or non-degradable in the body. After endothelialization is completed and complete occlusion is achieved, the vascular plug made of shape memory alloy materials will remain in the body permanently, which may pose long-term clinical risks.

[0004] Vascular plugs made of absorbable polymer materials can be degraded in the body, so that the vascular plugs can be gradually degraded and the degradation products are absorbed by the body without residue in the body. However, polymer materials are relatively soft, resulting in poor radial support performance of the vascular plugs. After implantation, the vascular plugs are continuously impacted by blood flow and there is a risk of falling off, which poses a clinical safety hazard. Summary of the invention

[0005] Based on this, it is necessary to provide an absorbable vascular plug with better radial support performance.

[0006] An absorbable vascular plug comprises a occluding frame and a spiral coil arranged in the occluding frame, wherein the occluding frame and the spiral coil are both made of absorbable material, the spiral coil extends axially, and in a natural state, the spiral coil abuts against the inner surface of the occluding frame.

[0007] In one embodiment, the sealing frame includes a sealing plug and a first sealing head and a second sealing head respectively connected to the two ends of the sealing plug, the spiral coil extends axially from one end of the sealing plug to the other end, and the two ends of the spiral coil are respectively connected to the first sealing head and the second sealing head.

[0008] In one embodiment, the sealing plug is columnar, and the spiral coil is a cylindrical spiral coil.

[0009] In one embodiment, the sealing frame includes a sealing plug, a first sealing disk and a second sealing disk, the two ends of the sealing plug are respectively connected to the first sealing disk and the second sealing disk, the spiral coil extends axially from one end of the sealing plug to the other end, and the two free ends of the spiral coil are passivation structures.

[0010] In one embodiment, the sealing frame includes a sealing plug, a first sealing disk, a second sealing disk, a first head and a second head, the two ends of the sealing plug are respectively connected to the first sealing disk and the second sealing disk, the first head is arranged at the end of the first sealing disk away from the sealing plug, the second head is arranged at the end of the second sealing disk away from the sealing plug, the spiral coil extends axially from the first sealing disk to the second sealing disk, and the two ends of the spiral coil are respectively connected to the first head and the second head.

[0011] In one of the embodiments, in the stretched state, the stretched length of the spiral coil is less than or equal to the stretched length of the occluding frame.

[0012] In one embodiment, the occlusion frame is made of an absorbable polymer material, and the spiral coil is made of an absorbable metal material;

[0013] Alternatively, the occluding frame and the spiral coil are both made of absorbable polymer materials.

[0014] In one embodiment, the wire diameter of the spiral coil is 0.1 to 1.5 mm.

[0015] In one embodiment, the occluding frame includes a plurality of braided wires and a plurality of fiber strands, the plurality of braided wires and the plurality of fiber strands are both made of absorbable materials, and the plurality of braided wires and the plurality of fiber strands are woven in a mutually intersecting manner to form a grid structure.

[0016] In one embodiment, the spiral coil is connected to the grid structure via a connector.

[0017] The absorbable vascular plug includes a spiral coil arranged along the axial direction. In a natural state, the spiral coil abuts against the inner surface of the occlusion frame. The spiral coil better supports the occlusion frame in the radial direction, so that the radial support performance of the absorbable vascular plug is better, which is conducive to better resisting the impact of blood flow, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an absorbable vascular plug according to an embodiment;

[0019] Figure 2 A schematic diagram of a weaving method of an absorbable vascular plug according to an embodiment;

[0020] Figure 3 This is a schematic structural diagram of a spiral coil of an absorbable vascular plug according to an embodiment;

[0021] Figure 4 A schematic structural diagram of a spiral coil of an absorbable vascular plug according to another embodiment;

[0022] Figure 5 It is a structural schematic diagram of a spiral coil of an absorbable vascular plug according to another embodiment;

[0023] Figure 6 It is a schematic structural diagram of an absorbable vascular plug according to another embodiment;

[0024] Figure 7 It is a schematic structural diagram of an absorbable vascular plug according to another embodiment;

[0025] Figure 8 It is a schematic structural diagram of a spiral coil of an absorbable vascular plug according to another embodiment;

[0026] Fig. 9 It is a schematic structural diagram of an absorbable vascular plug according to another embodiment;

[0027] Fig.10 for Fig. 9 The schematic diagram of the state where the absorbable vascular plug cooperates with the pushing member and the adjusting member is shown;

[0028] Fig.11 It is a schematic structural diagram of an adjusting member according to an embodiment. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] In the field of interventional medical devices, the “distal end” is defined as the end away from the operator during surgery, and the “proximal end” is defined as the end close to the operator during surgery. “Axial” refers to the direction parallel to the line connecting the distal and proximal centers of the medical device, and “radial” refers to the direction perpendicular to the axial direction. “Circumferential” refers to the circumferential direction, that is, the direction of the axis around the lumen device.

[0032] See also Figure 1The absorbable vascular plug 100 of one embodiment includes a blocking frame 10 and a spiral coil 30 disposed in the blocking frame 10. The blocking frame 10 and the spiral coil 30 are both made of absorbable materials, so that the absorbable vascular plug 100 can be gradually degraded and absorbed by the organism after completing the intended use, leaving no residue in the organism, and avoiding long-term clinical risks.

[0033] In one embodiment, if Figure 1 As shown, the occluding frame 10 includes a occluding plug 110 and a first end cap 120 and a second end cap 130 respectively connected to both ends of the occluding plug 110. The occluding plug 110 is a grid structure formed by weaving silk threads, and the first end cap 120 and the second end cap 130 are used to respectively gather and fix the two free ends of the silk threads. The first end cap 120 is located at the proximal end, and the second end cap 130 is located at the distal end. In one embodiment, a connecting structure is provided on the first end cap 120 so that the absorbable vascular plug 100 can be detachably connected to the conveyor, so as to disconnect the absorbable vascular plug 100 from the conveyor after being implanted in the body. The specific form of the connecting structure is not limited, as long as it can be detachably connected to the conveyor. For example, the connecting structure can be a thread, a hooking structure for connecting to the connecting line of the conveyor, etc.

[0034] In one embodiment, the sealing plug 110 is cylindrical, so that after implantation, the sealing plug 110 has a sufficient contact area with the blood vessel wall, which is beneficial to improving the performance of the absorbable vascular plug 100 in resisting blood flow impact.

[0035] like Figure 2 As shown, in one embodiment, the sealing plug 110 includes a plurality of braided wires 111 and a plurality of fiber strands 113. The braided wires 111 and the plurality of fiber strands 113 are both absorbable materials, and the plurality of braided wires 111 and the plurality of fiber strands 113 are woven in a mutually intersecting manner to form a grid structure. Among them, each fiber strand 113 is formed by the convergence of a plurality of fiber strands 113.

[0036] The braided wire 111 and the fiber line 113 are both made of absorbable materials. In one embodiment, the absorbable material is selected from at least one of L-polylactic acid, racemic polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer, polyhydroxyalkanoic acid ester, polydioxanone, polycaprolactone, polygluconic acid, polyhydroxybutyric acid, polyanhydride, polyphosphate, polyglycolic acid and polydioxanone. The material of the braided wire 111 and the material of the fiber line 113 can be the same or different.

[0037] Each fiber strand 113 formed by the convergence of multiple fiber strands 113 is relatively fluffy, so that the multiple fiber strands 113 can quickly absorb blood cells, form thrombi on the surface of the fiber strands 113, and gradually form a relatively dense structure, so that the occlusion can be completed quickly, so that the absorbable vascular plug 100 has better instant occlusion performance. Therefore, the absorbable vascular plug 100 can omit the flow-blocking membrane.

[0038] In one embodiment, the specification of each fiber strand 113 in the plurality of fiber strands 113 ranges from 50D / 18F to 600D / 144F.

[0039] In one embodiment, the specification range of each fiber line 113 in the plurality of fiber lines 113 is 50D / 72F-600D / 72F. In another embodiment, the specification range of each fiber line 113 in the plurality of fiber lines 113 is 90D / 72F-300D / 72F. The meaning of the above specifications means that, taking 50D / 72F as an example, each fiber line 113 contains 72 fiber lines 113, and the total mass of these 72 fiber lines 113 is 50 deniers (D). Other specifications have the same meaning and will not be repeated here.

[0040] The fiber wire 113 is relatively soft, and the number of strands of the fiber wire 113 cannot be too large in order to make the blocking frame 10 have a certain radial support force. In order to take into account both the radial support performance and the flow resistance performance of the blocking frame 10, in one embodiment, the ratio of the number of braided wires 111 to the number of strands of the fiber wire 113 is 1:3 to 7:1.

[0041] The first end cap 120 and the second end cap 130 are roughly columnar, such as a cylindrical, rectangular or square column. The first end cap 120 and the second end cap 130 are also made of absorbable materials, such as absorbable polymer materials or absorbable metal materials. The materials of the first end cap 120 and the second end cap 130 can be the same or different. In addition, the materials of the first end cap 120 and the second end cap 130 can be the same as or different from the materials of the sealing plug 110.

[0042] It should be noted that, in other embodiments, the blocking frame 20 may be woven only from the braided wires 111. In other embodiments, the blocking frame 20 is not a braided structure, but a grid structure formed by 3D printing.

[0043] like Figure 3 As shown, the spiral coil 30 is a cylindrical spiral coil to match the shape of the cylindrical sealing plug 110, so as to radially support the sealing plug 110. The spiral coil 30 has a first free end 310 and a second free end 320. Please refer to Figure 1 and Figure 3, the spiral coil 30 extends along the axial direction of the blocking frame 10 (the extension direction of the axis II of the blocking frame 10). In one embodiment, the spiral coil 30 extends from one end to the other end of the blocking plug 110, that is, from the proximal end to the distal end of the blocking plug 110, or from the distal end to the proximal end of the blocking plug 110. In addition, the first free end 310 of the spiral coil 30 is connected to the first sealing head 120, and the second free end 320 is connected to the second sealing head 130.

[0044] The connection method of the spiral coil 30 with the first end cap 120 and the second end cap 130 adopts the method known by those skilled in the art, including but not limited to hot melting, bonding, etc. In one embodiment, the first end cap 110 and the second end cap 130 are provided with a receiving groove or a receiving hole (not shown), and the two ends of the braided wire 111 and the fiber line 113 are respectively received in the receiving grooves or receiving holes of the first end cap 120 and the second end cap 130, and the first free end 310 and the second free end 320 of the spiral coil 30 are also respectively received in the receiving grooves or receiving holes of the first end cap 120 and the second end cap 130. After hot melting, the braided wire 111, the fiber line 113 and the spiral coil 30 are fixedly connected to the first end cap 120 and the second end cap 130, respectively.

[0045] Please go back Figure 1 In one embodiment, the spiral coil 30 is also connected to the sealing plug 110 through the connecting piece 50, that is, the spiral coil 30 is connected to the grid structure through the connecting piece 50, which is beneficial for the spiral coil 30 to reliably abut against the inner surface of the sealing plug 110 in a natural state, so that the spiral coil 30 can better support the sealing frame 10, thereby improving the radial supporting performance of the absorbable vascular plug 100.

[0046] In one embodiment, the connector 50 is a flexible connector to facilitate stretching of the absorbable vascular plug 100. The flexible connector can be an absorbable suture, a flexible absorbable metal wire, or the like.

[0047] In one embodiment, the first free end 310 of the spiral coil 30 is not connected to the first sealing head 120, and the second free end 320 is not connected to the second sealing head 130. The spiral coil 30 is connected to the grid structure of the sealing frame 10 through the connecting member 50.

[0048] In one embodiment, when the first free end 310 is not connected to the first sealing head 120 and the second free end 320 is not connected to the second sealing head 130, both the first free end 310 and the second free end 320 are blunt structures to avoid damaging the blood vessel. Figure 4 As shown, in one embodiment, the passivation structure is a spherical structure. In other embodiments, the passivation structure is not limited to a spherical structure. Figure 5As shown, the passivation structure may be a structure formed by curling the first free end 310 and the second free end 320 inwards, respectively. In other embodiments, the passivation structure may be a structure formed by curling outwards.

[0049] After implantation, the passivation structure can resist the occluding frame 10 and indirectly resist the blood vessel wall. On the one hand, it improves the performance of the absorbable vascular plug 100 in resisting blood flow impact. On the other hand, the passivation structure resists the occluding frame 10, which is conducive to maintaining the shape of the occluding frame 10 to better achieve occlusion.

[0050] The spiral coil 30 is made of an absorbable polymer material with a certain elasticity. Alternatively, the spiral coil 30 is made of a metal material with a certain elasticity, such as a spring steel material. During transportation, the occluding frame 10 and the spiral coil 30 are stretched so as to be loaded into the delivery sheath, and after reaching the target site, when the absorbable vascular plug 100 is released from the delivery sheath, the spiral coil 30 has a certain elasticity and can be well restored from the stretched state to the spiral state, so that the spiral coil 30 abuts against the inner surface of the occluding frame 10, which is conducive to the absorbable vascular plug 100 being able to better resist the impact of blood flow, so that it can be positioned at the target site.

[0051] In one embodiment, in order to ensure the supporting effect of the spiral coil 30, the wire diameter of the spiral coil 30 cannot be too small. However, when the wire diameter of the spiral coil 30 is too large, on the one hand, the radial dimension of the absorbable vascular plug 100 after stretching will be increased, resulting in difficulty in delivery; on the other hand, the degradation or corrosion of the spiral coil 30 is too slow, resulting in the long-term presence of foreign matter in the body. Therefore, the wire diameter of the spiral coil 30 should be moderate. In one embodiment, the wire diameter of the spiral coil 30 is 0.1 to 1.5 mm.

[0052] By setting the spiral coil 30 in the occluding frame 10, in a natural state, the spiral coil 30 abuts against the inner surface of the occluding frame 10, and the spiral coil 30 better supports the occluding frame 10 in the radial direction, so that the radial supporting performance of the absorbable vascular plug 100 is better, which is conducive to better resisting the impact of blood flow and improving the safety of use.

[0053] Moreover, compared with the method of using a double-layer mesh tube to weave the sealing plug 110 to improve the radial support performance, the material usage of the spiral coil 30 is small, and the spiral coil 30 in the stretched state is roughly a straight line. Adding the spiral coil 30 to the blocking frame 10 will not significantly increase the amount of degradation products, that is, it will not significantly increase the metabolic burden of the organism. On the contrary, since the spiral coil 30 is provided, the spiral coil 30 can play a supporting role, so the sealing plug 110 can be formed by weaving a braided wire 111 with a smaller wire diameter and a fiber wire 113 with a smaller specification, or the braiding density can be appropriately reduced, thereby reducing the metabolic burden of the organism and reducing the inflammatory response.

[0054] At the same time, when the occlusion frame 10 is made of an absorbable polymer material and the spiral coil 30 is made of an absorbable metal material, by reasonably selecting parameters such as material and wire diameter, staggered degradation is formed to reduce the inflammatory response.

[0055] In one embodiment, the materials of the braided wire 111 and the fiber wire 113 are both left-handed polylactic acid. The wire diameter of the braided wire 111 is 0.1 to 0.5 mm, the specification of the fiber wire 113 is 75D / 36F to 400D / 144F, and the ratio of the number of braided wires 111 to the number of strands of the fiber wire 113 is 1:3 to 7:1. The material of the spiral coil 30 is spring steel, and the wire diameter of the spiral coil 30 is 0.1 to 1.5 mm. Through reasonable settings, the fiber wire 113, the braided wire 111 and the spiral coil 30 can be degraded at different peaks, thereby avoiding the concentrated release of degradation products, avoiding tissue inflammation, and being safe to use.

[0056] Polymer materials are relatively soft, and the occluding frame 10 made of polymer materials is not easy to shape. After the absorbable occluding plug 100 is delivered to the target site and released, the occluding frame 10 cannot automatically return to the fixed state, or there may be a problem that the release shape of the occluding frame 10 is not good, resulting in poor occluding performance. A spiral coil 30 is set in the occluding frame 10. After release, the spiral coil 30 will restore the spiral state to open the occluding frame 10, which is conducive to the occluding frame 10 to return to a natural state or a state close to the natural state to achieve good occlusion. That is, the provision of the spiral coil 30 is conducive to making the release shape of the occluding frame 10 good and improving the radial support performance of the absorbable vascular plug 100.

[0057] In one embodiment, when the spiral coil 30 extends axially from the proximal end to the distal end of the occluding frame 10, in the stretched state, the length of the spiral coil 30 is equal to the length of the occluding frame 10, so that the occluding frame 10 and the spiral coil 30 can be stretched to the maximum stretched state, and the spiral coil 30 is not unable to be straightened due to the limitation of the occluding frame 10, or the occluding frame 10 is not unable to be straightened due to the limitation of the spiral coil 30, so that the radial size of the absorbable vascular plug 100 after stretching is smaller, so that it can be used for smaller sheath delivery to facilitate delivery.

[0058] In one embodiment, if Figure 6As shown, when the spiral coil 30 extends axially in the sealing plug 110, but the length of the spiral coil 30 is relatively short, in the natural state, the axial length L1 of the spiral coil 30 is less than the axial length L2 of the sealing plug 110. In the stretched state, the axial length of the spiral coil 30 is less than the axial length of the sealing plug 110, and the portion of the sealing plug 110 that is radially opposite to the spiral coil 30 can be stretched axially synchronously with the spiral coil 30, and the other portions of the sealing plug 110 are not restricted by the spiral coil 30 and can be stretched axially freely. In this way, a shorter spiral coil 30 can be used to reduce the absorption burden of the body, but a certain radial support performance should be guaranteed. In one embodiment, the ratio of L1 to L2 is 1:3 to 1:1, and the number of turns of the spiral coil 30 is not less than 2 turns, so as to ensure that the absorbable vascular plug 100 has sufficient radial support performance and make the axial stretching of the absorbable vascular plug 100 more convenient.

[0059] See also Figure 7 , an absorbable vascular plug 200 according to another embodiment includes a blocking frame 20 and a spiral coil 40 disposed in the blocking frame 20. Both the blocking frame 20 and the spiral coil 40 are made of absorbable materials.

[0060] Different from the blocking frame 10, the blocking frame 20 includes a blocking plug 210, a first blocking disk 220, a second blocking disk 230, a first end cap 240 and a second end cap 250, and both ends of the blocking plug 210 are respectively connected to the first blocking disk 220 and the second blocking disk 230. The first end cap 240 is connected to the proximal end of the first blocking disk 220, and the second end cap 250 is connected to the distal end of the second blocking disk 230. The first end cap 240 and the second end cap 250 are used to respectively gather and fix the two free ends of the wire.

[0061] like Figure 7 As shown, the sealing plug 210 is columnar, and the first sealing disk 220 and the second sealing disk 230 are disk-shaped. The first sealing disk 220 is connected to the sealing plug 210 through a first waist 260, and the second sealing disk 230 is connected to the sealing plug 210 through a second waist 270.

[0062] By adding the first occluding disk 220 and the second occluding disk 230 to the two ends of the sealing plug 210, on the one hand, the combination of the columnar sealing plug 210 and the disc-shaped first occluding disk 220 and the second occluding disk 230 ensures the contact area with the lesion site (such as the blood vessel wall). On the other hand, the sealing plug 210 and the first occluding disk 220 and the second occluding disk 230 are connected through the first waist 260 and the second waist 270 with smaller radial dimensions, so that the angle between the first occluding disk 220 and the sealing plug 210 and between the sealing plug 210 and the second occluding disk 230 can be adjusted, which is conducive to the absorbable vascular plug 200 to adapt to lesions of different shapes to adapt to different individuals.

[0063] Different from the spiral coil 30 , the spiral coil 40 is not a cylindrical structure, and the shape of the spiral coil 40 is adapted to the shape of the blocking frame 20 .

[0064] See also Figure 8 The spiral coil 40 includes a first segment 410, a second segment 420, a third segment 430, a fourth segment 440 and a fifth segment 450 which are connected in sequence. The first segment 410 is located in the first occluding disk 220, the second segment 420 is located in the first waist 260, the third segment 430 is located in the occluding disk 210, the fourth segment 440 is located in the second waist 270, and the fifth segment 450 is located in the second occluding disk 230. The spiral coil 40 extends axially from the proximal end to the distal end of the occluding frame 20 to support the entire occluding frame 20, so that each part of the occluding frame 20 is well released and the radial supporting force is improved.

[0065] See also Fig. 9 In another embodiment, the spiral coil 40 extends axially from the proximal end to the distal end of the sealing plug 210, and the spiral coil 40 does not extend to the first sealing disk 220, the second sealing disk 230, the first waist 260, and the second waist 270. The spiral coil 40 supports the sealing plug 210 in the sealing plug 210, and can also improve the radial support force of the absorbable vascular plug 200, thereby improving the performance of the absorbable vascular plug 200 in resisting blood flow. In addition, the length of the spiral coil 40 after stretching is shorter, that is, the amount of the spiral coil 40 is less, which is conducive to reducing the metabolic burden of the organism and reducing the inflammatory response.

[0066] Please continue reading Fig. 9 The first end cap 240 is provided with a first through hole 241, the second end cap 250 is provided with a second through hole 251 and a receiving portion 252, the first through hole 241 and the second through hole 251 are opposite to each other, and the receiving portion 252 is located on one side of the second through hole 251. The blocking frame 20 has an inner cavity, and the first through hole 241, the inner cavity of the blocking frame 20 and the second through hole 251 are connected to form a path. The receiving portion 252 is a groove or a through hole. The central axis of the second through hole 252 along the axial direction and the central axis of the receiving portion 252 along the axial direction are not on the same straight line.

[0067] See also Fig.10 The absorbable vascular plug 200 is implanted using a delivery device including a pusher 300 and an adjustment member 400. The pusher 300 is a hollow tubular structure. Fig.11 The adjusting member 400 includes a straight section 401 and a bent section 402 connected to the straight section 401. In a natural state, the bent section 402 is bent relative to the straight section 401.

[0068] During the implantation process, the pusher 300 of the conveyor enters the occluding frame 20 along the above-mentioned path, and the distal end of the pusher 300 abuts against the second head 250 to straighten the absorbable vascular plug 200, so that the absorbable vascular plug 200 is in an axially stretched state. The adjusting member 400 axially extends in the inner cavity of the pusher 300 to the second through hole 251 of the second head 250, and the bent section 402 of the adjusting member 400 extends from the second through hole 251 to the outside of the occluding frame 20, and the end of the bent section 402 away from the straight section 401 extends into the receiving portion 252 of the second head 250, so that the connection between the bent section 402 and the straight section 401 can be hooked with the second head 250, as shown in FIG. Fig.10 After the absorbable vascular plug 200 is delivered to the target site, the pusher 300 is moved axially toward the proximal end until the pusher 300 is withdrawn from the blocking frame 20. While the connection between the bent section 402 and the straight section 401 is kept hooked with the second sealing head 250 or the free end surface of the bent section 402 is abutted against the second blocking 250, the adjusting member 400 is moved axially toward the proximal end, thereby compressing the blocking frame 20, so that the first blocking disk 220 and the second blocking disk 230 are successfully restored to a natural state or a state close to a natural state, thereby achieving good blocking.

[0069] The absorbable vascular plug 200 of this embodiment is only provided with a spiral coil 40 in the sealing plug 210. The spiral coil 40 can improve the radial support performance of the sealing plug 210, and can assist in the molding of the sealing plug 210, so that the release form of the sealing plug 210 is good, which is conducive to improving the blocking effect. At the same time, by respectively providing the first blocking disk 210 and the second blocking disk 220 on both sides of the sealing plug 210, the contact area between the absorbable vascular plug 200 and the blood vessel wall is further increased, thereby improving the performance of the absorbable vascular plug 200 in resisting blood flow impact. Furthermore, since the first blocking disk 220, the sealing plug 210 and the second blocking disk 230 are arranged in sequence along the axial direction, even if any one of the three is poorly released, only one of them is released well, that is, the absorbable vascular plug 200 can have a better immediate blocking effect.

[0070] By providing a first through hole 241 in the first sealing head 240, and providing a second through hole 251 and a receiving portion 252 in the second sealing head 250, the absorbable vascular plug 200 can cooperate with the adjusting member 400 having the bending section 402 to promote good molding of the first occluding disk 220 and the second occluding disk 230. In the process of the adjusting member 400 moving proximally to axially compress the absorbable vascular plug 200, since the spiral coil 40 is in a spiral shape, compared with the method of using a double-layer mesh tube to weave the sealing plug 210 or adding a circumferentially distributed annular support member to the sealing plug 210, the spiral coil 40 has a weaker resistance to the axial compression of the absorbable vascular plug 200, which is convenient for operation, so that the first occluding disk 220 that is not in direct contact with the adjusting member 400 is well molded.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0072] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An absorbable vascular plug, characterized in that: It comprises a blocking frame and a spiral coil arranged in the blocking frame, wherein the blocking frame and the spiral coil are both made of absorbable material, the spiral coil extends axially, and when the absorbable vascular plug is released from the delivery sheath, the spiral coil abuts against the inner surface of the blocking frame; The sealing frame includes a sealing plug, a first sealing disk and a second sealing disk, one end of the sealing plug is connected to the first sealing disk via a first waist, and the other end of the sealing plug is connected to the second sealing disk via a second waist, the spiral coil extends axially from one end of the sealing plug to the other end but does not extend to the first sealing disk, the second sealing disk, the first waist and the second waist, and both free ends of the spiral coil are passivation structures.

2. The absorbable vascular plug according to claim 1, characterized in that: The sealing plug is columnar, and the spiral coil is a cylindrical spiral coil.

3. The absorbable vascular plug according to claim 1, characterized in that: In the stretched state, the stretched length of the spiral coil is smaller than the stretched length of the occluding frame.

4. The absorbable vascular plug according to claim 1, characterized in that: The blocking frame is made of absorbable polymer material, and the spiral coil is made of absorbable metal material; Alternatively, the occluding frame and the spiral coil are both made of absorbable polymer materials.

5. The absorbable vascular plug according to claim 4, characterized in that: The wire diameter of the spiral coil is 0.1 to 1.5 mm.

6. The absorbable vascular plug according to claim 1, characterized in that: The occluding frame comprises a plurality of braided wires and a plurality of fiber strands, wherein the plurality of braided wires and the plurality of fiber strands are both made of absorbable materials, and the plurality of braided wires and the plurality of fiber strands are woven in a mutually intersecting manner to form a grid structure.

7. The absorbable vascular plug according to claim 6, characterized in that: The spiral coil is connected to the grid structure via a connecting piece.

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