Stent binding structure and covered stent system

Abstract

The invention is suitable for the field of medical instruments, and provides a stent binding structure and a covered stent system. The stent binding structure comprises a tail end, a binding ring, a lock catch assembly and a stay wire end, the tail end comprises a uniknot ring with a first free section, the lock catch assembly is connected with the tail end, the binding ring and the stay wire end, the stay wire end is provided with a second free end, and the binding ring binds the covered stent. The binding rings and the lock catches can be sequentially released and released into non-knotted threads connected with the second free section, the situations of clamping stagnation and incapability of taking out are avoided, the problem that the threads are difficult to take due to the fact that the threads are wound on the covered stent to form spiral threads during thread removal can be effectively solved, no foreign matter is left in the body after an operation, and the success rate and the efficiency of the operation can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to a stent binding structure and a covered stent system. Background Art

[0002] Surgical medical thoracic covered stent system delivery devices are widely used in the treatment of thoracic aortic diseases, mainly for the treatment of aortic arch, brachiocephalic trunk, left common carotid artery and left subclavian artery aneurysms, dissections, ulcers, etc.

[0003] As Figure 1A described, traditional stent binding structures usually adopt a scroll knot structure, a helical winding structure, a loop buckle structure, etc. The scroll knot structure is composed of a single binding wire. During the release process, since the actual binding wire is helically wound around the stent, after the stent is released, it is easy to cause difficulties in removing the binding wire or even the situation where the binding wire cannot be removed, like the helical winding structure, which increases the risk of surgery.

[0004] The helical winding structure is composed of a fixed wire and a binding wire. During the release process, pulling the fixed wire releases the binding wire and the fixed wire. The stent loses the restraint of the binding wire and expands under the action of self-expansion. Since the binding wire is in a helical structure, a shorter stent can still meet the requirement of removing the binding wire, but for a too long stent, the two ends of the binding wire are difficult to move under the extrusion of the stent and the blood vessel inner wall, resulting in the inability to expand the middle section of the stent.

[0005] The loop buckle structure is composed of a fixed wire and multiple binding wire loops. Among them, the binding wire may or may not be connected to the stent. During the release process, pulling the fixed wire releases the binding wire loops one by one, and the stent expands under the action of self-expansion. In this solution, the binding wire stays between the blood vessel inner wall and the stent, leaving redundant objects in the body after the stent is implanted, affecting the surgical effect. Summary of the Invention

[0006] The purpose of the present invention is to provide a stent binding structure and a covered stent system, aiming to solve the technical problem that the existing stent binding structure has difficulties in removing the binding wire or even the situation where the binding wire cannot be removed due to spiral winding after the stent is released.

[0007] The present invention is implemented as follows: A stent binding structure for radially binding a covered stent, the stent binding structure comprising:

[0008] A tail end, the tail end including a single knot loop, the single knot loop having a first free section;

[0009] At least one binding loop for circumferentially winding around the outer periphery of the covered stent to bind and restrain the covered stent;

[0010] A locking component for connecting the tail end and the binding loop;

[0011] The wire-pulling end, and the wire-pulling end is connected to the binding ring farthest from the tail end through the buckle assembly. One end of the wire-pulling end away from the buckle assembly is the second free section. The buckle assembly and each binding ring are located between the tail end and the wire-pulling end. By pulling the second free section, each binding ring and the buckle assembly can be sequentially released and released into an unknotted wire connected to the second free section.

[0012] Optionally, a plurality of binding rings are provided. The buckle assembly includes a first connecting portion, at least one second connecting portion, and a third connecting portion. The first connecting portion is used to connect the tail end to the binding ring closest to the tail end. The second connecting portion is used to connect two adjacent binding rings. The third connecting portion is used to connect the binding ring farthest from the tail end and the wire-pulling end. The first connecting portion, the second connecting portion, and the third connecting portion each include at least one buckle.

[0013] Optionally, the single knot ring includes a ring body portion, a ring knot portion, and the first free section. The ring knot portion includes a first connecting section and a second connecting section that intersects the first connecting section at a right angle. One end of the first connecting section is connected to one end of the ring body portion, and the other end is connected to the first connecting portion. One end of the second connecting section is connected to the other end of the ring body portion, and the other end is connected to one end of the first free section. And the end of the first connecting section connected to the first connecting portion and the end of the second connecting section connected to the first free section are respectively located on opposite sides of the ring body portion.

[0014] Optionally, the buckle includes a first U-shaped ring and a back-through section. One free end of the open end of the first U-shaped ring is connected to one end of the back-through section. The back-through section is hooked to the ring body portion of the single knot ring, the first U-shaped ring of an adjacent buckle, or an adjacent binding ring. The other end of the back-through section passes through the inside of the closed end of the first U-shaped ring from the direction away from the tail end.

[0015] Optionally, the first connecting portion includes two buckles, namely a first buckle and a second buckle. One free end of the first U-shaped ring of the first buckle is connected to the first connecting section of the single knot ring. The other end of the back-through section of the first buckle passes through the inside of the closed end of the first U-shaped ring of the first buckle from the direction away from the tail end and is then connected to one free end of the open end of the first U-shaped ring of the second buckle. The back-through section of the second buckle is hooked to the first U-shaped ring of the first buckle. One end of the back-through section of the second buckle passes through the inside of the closed end of the first U-shaped ring of the second buckle from the direction away from the tail end and is then connected to the binding ring.

[0016] Optionally, the binding ring includes a first ring connected to the first connecting portion or the second connecting portion, and a second ring connected to the first ring. The second ring is arranged side by side with the first ring. The first ring includes a first C-shaped ring, a first turning portion, and a first return bend portion. One end of the first C-shaped ring is connected to a folded segment of the first turning portion, and the other end is connected to one end of the first return bend portion;

[0017] The second ring includes a second C-shaped ring, a second turning portion, and a second return bend portion. One end of the second C-shaped ring is connected to a folded segment of the second turning portion, and the other end is connected to the other end of the first return bend portion. Another folded segment of the second turning portion is connected to one end of the second return bend portion. The second return bend portion is hooked on the first U-shaped ring of the buckle, and the other end of the second return bend portion passes through the inside of the first return bend portion from the direction away from the tail end and is then connected to the buckle of the next second connecting portion or the third connecting portion.

[0018] Optionally, the binding ring includes a first ring connected to the first connecting portion or the second connecting portion, and a second ring connected to the first ring. The second ring is arranged side by side with the first ring. The first ring includes a first bending portion, a first ring body segment, and a first return folding segment. One folded segment of the first bending portion is connected to the first connecting portion or the second connecting portion, and the other folded segment is connected to one end of the first ring body segment. One end of the first return folding segment is connected to the other end of the first ring body segment, and the other end returns and passes through the inside of the fold angle of the first bending portion from the direction towards the tail end, and the first return folding segment is pressed inside the folded segment of the first bending portion;

[0019] The second ring includes a second ring body segment, a second bending portion, and a third return bend portion. One end of the second ring body segment is connected to one end of the first return folding segment, and the other end is connected to a folded segment of the second bending portion from the outside of the first return folding segment. Another folded segment of the second bending portion passes through the inside of the first ring body segment and the second ring body segment and is then connected to one end of the third return bend portion. The third return bend portion is hooked on the first connecting portion or the second connecting portion, and the other end of the third return bend portion passes through the inside of the first return folding segment from the direction away from the tail end and is then connected to the buckle of the next second connecting portion or the third connecting portion.

[0020] Optionally, the other end of the third return bend portion is pressed outside the first bending portion and the second bending portion.

[0021] Optionally, the other end of the third return bend portion is pressed inside the first bending portion and the second bending portion.

[0022] Optionally, the binding ring includes a first ring connected to the first connecting portion or the second connecting portion, a second ring connected to the first ring, a third ring connected to the second ring, and a fourth ring connected to the third ring. The first ring, the second ring, the third ring, and the fourth ring are arranged side by side. The first ring includes a third bending portion and a third ring body section. One segment of the third bending portion is connected to the first connecting portion or the second connecting portion, and the other segment is connected to one end of the third ring body section;

[0023] The second ring includes a fourth ring body section and a second folding section. One end of the fourth ring body section is connected to the other end of the third ring body section, and the other end is connected to one end of the second folding section;

[0024] The third ring includes a fifth ring body section. One end of the fifth ring body section is connected to the other end of the second folding section, and the other end is connected to one end of the fourth ring;

[0025] The fourth ring includes a sixth ring body section, a fourth bending portion, and a third folding section. One end of the sixth ring body section is connected to the other end of the fifth ring body section, and the other end is connected to one segment of the fourth bending portion. The other segment of the fourth bending portion is connected to one end of the third folding section. The third folding section is hooked on the first connecting portion or the second connecting portion, and the other end of the third folding section passes through the inner side of the second folding section from the direction away from the tail end and is connected to the buckle of the next second connecting portion or the third connecting portion;

[0026] The fourth ring body section and the sixth ring body section are located between the third ring body section and the fifth ring body section.

[0027] Optionally, the other end of the third folding section is externally pressed against the outer sides of the fourth ring body section of the second ring and the sixth ring body section of the fourth ring.

[0028] Optionally, the other end of the third folding section is internally pressed against the inner sides of the fourth ring body section of the second ring and the sixth ring body section of the fourth ring.

[0029] Optionally, the binding ring includes a first ring connected to the first connecting portion or the second connecting portion, a second ring connected to the first ring, a third ring connected to the second ring, and a fourth ring connected to the third ring. The first ring, the second ring, the third ring, and the fourth ring are arranged side by side. The first ring includes a fifth bending portion and a seventh ring body section. One segment of the fifth bending portion is connected to the first connecting portion or the second connecting portion, and the other segment is connected to one end of the seventh ring body section;

[0030] The second loop includes an eighth loop body section and a fourth folding section. One end of the eighth loop body section is connected to the other end of the seventh loop body section, and the other end is connected to one end of the fourth folding section. The other end of the fourth folding section passes through the bending point of the fifth bending portion and is externally pressed against a folded section of the fifth bending portion.

[0031] The third loop includes a ninth loop body section. One end of the ninth loop body section is connected to the fourth folding section, and the other end is connected to one end of the fourth loop.

[0032] The fourth loop includes a tenth loop body section, a sixth bending portion, and a fifth folding section. One end of the tenth loop body section is connected to one end of the ninth loop body section of the third loop, and the other end is connected to a folded section of the sixth bending portion. The other folded section of the sixth bending portion is connected to one end of the fifth folding section. The fifth folding section is hooked to the first U-shaped loop of the buckle that is farthest from the tail end of the first connecting portion or the second connecting portion. The other end of the fifth folding section passes through the loop formed by the sixth bending portion and the fourth folding section from the outside of the loop body sections of the first loop, the second loop, the third loop, and the fourth loop, and then extends to be connected to the buckle of the next second connecting portion or the third connecting portion.

[0033] Optionally, the wire end includes a second U-shaped loop, a third U-shaped loop, and the second free section. The two free ends of the open end of the second U-shaped loop intersect with the inner side of the closed end of the first U-shaped loop of the buckle that is farthest from the tail end in the third connecting portion. The third U-shaped loop is hooked on the closed end of the first U-shaped loop of the buckle that is farthest from the tail end. One free end of the open end of the third U-shaped loop is connected to one free end of the open end of the second U-shaped loop, and the other free end is connected to the second free section.

[0034] A covered stent system includes a covered stent and the above-mentioned stent binding structure connected to the covered stent. The covered stent includes a tubular body. The binding loop is circumferentially wound around the outer periphery of the tubular body of the covered stent to bundle and bind the covered stent. The tail end is located at one end of the tubular body, and the wire end is located at the other end of the tubular body. By pulling the wire end, each of the binding loops and the buckle assembly can be sequentially released and released into an unknotted wire connected to the second free section of the wire end.

[0035] The stent binding structure and the covered stent system provided by the present invention are provided with a tail end, a binding ring, a locking component and a wire-pulling end. The tail end includes a single knot ring having a first free section. The locking component connects the tail end, the binding ring and the wire-pulling end, and the wire-pulling end has a second free end. The binding ring binds the covered stent, and by pulling the wire-pulling end, each binding ring and the locking buckle can be released and released into an unknotted wire connected to the second free section, without jamming and being unable to be taken out, effectively avoiding the problem of difficult wire extraction caused by the covered stent being wound into a spiral wire when the wire is withdrawn, leaving no foreign objects in the body after the operation, and improving the success rate and operation efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1A is a schematic structural diagram of a stent binding structure in the prior art;

[0037] Figure 1 is a schematic diagram of the tail end of the stent binding structure provided in Embodiment 1 of the present invention;

[0038] Figure 2 is a schematic diagram of the disassembly of the locking buckle and the tail end provided in Embodiment 1 of the present invention;

[0039] Figure 3 is a schematic diagram of the locking buckle and the tail end after connection provided in Embodiment 1 of the present invention;

[0040] Figure 4 is a schematic diagram of the disassembly of the tail end and the first connection part including a plurality of locking buckles provided in Embodiment 1 of the present invention;

[0041] Figure 5 is a schematic diagram of the connection of the tail end and the first connection part including a plurality of locking buckles provided in Embodiment 1 of the present invention;

[0042] Figure 6 is a schematic diagram of the connection of the tail end, the first connection part and the first ring of the binding ring provided in Embodiment 1 of the present invention;

[0043] Figure 7 is a schematic diagram of the connection of the tail end, the first connection part and the binding ring provided in Embodiment 1 of the present invention;

[0044] Figure 7a is a schematic structural diagram of the wire-pulling end provided in Embodiment 1 of the present invention;

[0045] Figure 8 Schematic structural diagram of the stent binding structure provided in Embodiment 1 of the present invention;

[0046] Figure 9 is a schematic diagram of the stent binding structure provided in Embodiment 1 of the present invention sleeved on the covered stent;

[0047] Figure 10Schematic diagram of the connection between the tail end, the first connection part and the first ring of the restraint ring provided in the second embodiment of the present invention;

[0048] Figure 11 Schematic diagram of the connection between the tail end, the first connection part and the restraint ring provided in the second embodiment of the present invention;

[0049] Figure 12 Another schematic diagram of the connection between the tail end, the first connection part and the restraint ring provided in the second embodiment of the present invention;

[0050] Figure 13 Schematic diagram of the sequential connection of the tail end, the first connection part, the restraint ring and the second connection part provided in the second embodiment of the present invention;

[0051] Figure 14 Schematic diagram of the stent restraint structure provided in the second embodiment of the present invention;

[0052] Figure 15 Schematic diagram of an embodiment where the stent restraint structure provided in the second embodiment of the present invention is sleeved on the covered stent;

[0053] Figure 15a It is Figure 15 Enlarged schematic diagram of part A in;

[0054] Figure 16 Schematic diagram of another embodiment where the stent restraint structure provided in the second embodiment of the present invention is sleeved on the covered stent;

[0055] Figure 16a It is Figure 16 Enlarged schematic diagram of part B in;

[0056] Figure 17 Schematic diagram of the connection between the tail end, the first connection part and the first ring of the restraint ring provided in the third embodiment of the present invention;

[0057] Figure 18 Schematic diagram of the connection between the tail end, the first connection part and the first and second rings of the restraint ring provided in the third embodiment of the present invention;

[0058] Figure 19 Schematic diagram of the connection between the tail end, the first connection part and the first, second and third rings of the restraint ring provided in the third embodiment of the present invention;

[0059] Figure 20 Schematic diagram of the connection between the tail end, the first connection part and the restraint ring provided in the third embodiment of the present invention;

[0060] Figure 21 Schematic diagram of the connection between the tail end, the first connection part, the restraint ring and the second connection part provided in the third embodiment of the present invention;

[0061] Figure 22 It is a schematic diagram of the stent restraint structure provided in the third embodiment of the present invention;

[0062] Figure 23 It is a schematic diagram of an embodiment in which the stent restraint structure provided in the third embodiment of the present invention is sleeved on the covered stent;

[0063] Figure 23a is Figure 23 An enlarged schematic diagram of part C in

[0064] Figure 24 It is a schematic diagram of another embodiment in which the stent restraint structure provided in the third embodiment of the present invention is sleeved on the covered stent;

[0065] Figure 24a is Figure 24 An enlarged schematic diagram of part D in

[0066] Figure 25 It is a schematic diagram of the connection between the tail end, the first connection part and the first ring of the restraint ring provided in the fourth embodiment of the present invention;

[0067] Figure 26 It is a schematic diagram of the connection between the tail end, the first connection part and the first and second rings of the restraint ring provided in the fourth embodiment of the present invention;

[0068] Figure 27 It is a schematic diagram of the connection between the tail end, the first connection part and the first, second and third rings of the restraint ring provided in the fourth embodiment of the present invention;

[0069] Figure 28 It is a schematic diagram of the connection between the tail end, the first connection part and the restraint ring provided in the fourth embodiment of the present invention;

[0070] Figure 29 It is a schematic diagram of the stent restraint structure provided in the fourth embodiment of the present invention;

[0071] Figure 30 It is a schematic diagram when the stent restraint structure provided in the fourth embodiment of the present invention is sleeved on the covered stent;

[0072] Figure 31 It is a schematic diagram of the covered stent system provided in the embodiment of the present invention.

[0073] 100. Stent restraint structure;

[0074] 10. Tail end; 11. Single knot ring; 111. First free section; 112. Ring body part; 113. Ring knot part; 1131. First connection section; 1132. Second connection section;

[0075] 20. Restraint ring;

[0076] 21. First ring; 211. First C-shaped ring; 212. First turning part; 213. First return bend part; 214. First bending part; 215. First ring body segment; 216. First return fold segment; 217. Third bending part; 218. Third ring body segment;

[0077] 22. Second ring; 221. Second C-shaped ring; 222. Second turning part; 223. Second return bend part; 224. Second ring body segment; 225. Second bending part; 226. Third return bend part; 227. Fourth ring body segment; 228. Second return fold segment;

[0078] 23. Third ring; 231. Fifth ring body segment;

[0079] 24. Fourth ring; 241. Sixth ring body segment; 242. Fourth bending part; 243. Third return fold segment; 251. Fifth bending part; 252. Seventh ring body segment; 253. Eighth ring body segment; 254. Fourth return fold segment; 255. Ninth ring body segment; 256. Tenth ring body segment; 257. Sixth bending part; 258. Fifth return fold segment;

[0080] 3. Locking component; 30. Lock; 301. First U-shaped ring; 302. Return threading segment; 31. First connecting part; 311. First lock; 312. Second lock; 32. Second connecting part; 33. Third connecting part;

[0081] 40. Pull wire end; 41. Second free segment; 42. Second U-shaped ring; 43. Third U-shaped ring;

[0082] 600. Membrane-covered stent system; 60. Membrane-covered stent; 61. Tubular body; 611. Wave ring. Detailed implementation mode

[0083] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0084] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0085] It should also be noted that the orientation terms such as left, right, up, and down in this embodiment are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered restrictive.

[0086] Embodiment 1

[0087] like Figures 1 to 9 , which are schematic diagrams of a stent restraining structure 100 provided in the first embodiment of the present invention, the stent restraining structure 100 comprises a tail end 10, a restraining ring 20, a locking assembly 3 and a pull wire end 40. The stent restraining structure 100 is used to restrain the stent graft in radial direction.

[0088] The tail end 10 includes a single knot ring 11, which has a first free section 111; the restraint ring 20 is used to be circumferentially arranged around the outer periphery of the coated stent 60 to bind and restrain the coated stent 60; the locking assembly 3 is used to connect the tail end 10 and the restraint ring 20, and the locking assembly 3 is also used to connect the pull wire end 40 and the restraint ring 20 farthest from the tail end 10, one end of the pull wire end 40 is connected to the lock 30 farthest from the tail end 10, and the other end is the second free section 41, each locking assembly 3 and each restraint ring 20 are located between the tail end 10 and the pull wire end 40, by pulling the second free section 41, each restraint ring 20 and each locking assembly 3 can be released in sequence and released into an uncloning line connected to the second free section 41, and the sequential release is to release in sequence along the direction extending axially from the second free section 41 to the tail end 10.

[0089] The end of the first free section 111 is unconstrained, and it is not connected to other components in a free state. In some embodiments, the restraint ring 20 can be bound to the outer periphery of the wave coil of the stent graft 60. When the restraint ring 20 binds the wave coil of the stent graft 60, the stent graft 60 can be compressed into a compressed state. The number of restraint rings 20 and the number of restraint rings 20 are not limited, that is, a single restraint ring 20 may include one ring, or may include two rings, three rings, or four side-by-side rings or more rings. A restraint ring 20 may be provided with at least one, or two, three, or the like. When a plurality of restraint rings 20 are provided, each restraint ring 20 is arranged at intervals, and the interval distance between each restraint ring 20 is adapted to the spacing between each wave coil 611 of the stent graft 60, and adjacent restraint rings 20 are connected by a lock 30. Normally, the pull wire end 40 is located at the proximal end during the surgical operation, and the tail end 10 is located at the distal end during the surgical operation. In this way, by pulling the second free segment 41 of the pull wire end 40 at the proximal end, each lock buckle 30 and the restraining ring 20 can be released in sequence from the proximal end to the distal end. After the stent restraining structure 100 is released, the stent restraining structure 100 is finally released into a single (one) unknotted line, and the two ends of the single line are respectively the first free segment 111 and the second free segment 41. After being released into a single line, it will not be entangled on the surface of the coated stent 60, so it can be withdrawn more conveniently without getting stuck or being unable to be removed. It can effectively avoid the problem of winding the coated stent 60 into a spiral line when withdrawing the line, which makes it difficult to remove the line. No foreign matter is left in the body after the operation, which can improve the success rate and efficiency of the operation.

[0090] The tail end 10 of the stent binding structure 100 is in a free state. When the covered stent 60 is bound and compressed by the stent binding structure 100, due to the expansion tension of the corrugated rings, the reverse acting force received at the binding ring 20 is the largest. The pulling force received by the buckle 30 near the binding ring 20 is larger than that received by the buckle 30 far from the binding ring 20. Therefore, the binding ring 20 and the buckle 30 near the binding ring 20 will closely adhere to the covered stent 60. By the mutual pressing of the binding ring 20 and the buckle 30 with the corrugated rings of the covered stent 60, when the stent binding structure 100 binds the covered stent 60, it will not easily become loose.

[0091] In some embodiments, a plurality of binding rings 20 are provided. The buckle assembly 3 includes a first connecting portion 31, a second connecting portion 32, and a third connecting portion 33. The first connecting portion 31 is used to connect the tail end 10 to the binding ring 20 closest to the tail end 10. The second connecting portion 32 is used to connect two adjacent binding rings 20. The third connecting portion 33 is used to connect the binding ring 20 farthest from the tail end 10 and the wire end 40. The first connecting portion 31, the second connecting portion 32, and the third connecting portion 33 each include at least one buckle 30.

[0092] The number and length of the buckles 30 included in the first connecting portion 31 are determined according to the distance between the tail end 10 and the binding ring 20 closest to the tail end 10. The number and length of the buckles 30 included in the second connecting portion 32 are determined according to the distance between two adjacent binding rings 20. The number and length of the buckles 30 included in the third connecting portion 33 are determined according to the distance between the binding ring 20 farthest from the tail end 10 and the wire end 40.

[0093] The first connecting portion 31, the second connecting portion 32, and the third connecting portion 33 are distributed along the axial direction of the binding ring 20. When a plurality of binding rings 20 are provided, a second connecting portion 32 is provided between every two adjacent binding rings 20, and the second connecting portion 32 connects the two adjacent binding rings 20. The second connecting portion 32 is located between the first connecting portion 31 and the third connecting portion 33. The number of the buckles 30 included in the first connecting portion 31, the second connecting portion 32, and the third connecting portion 33 is determined according to the spacing between the corrugated rings of the covered stent 60 to be bound, the distal and proximal conditions of the covered stent 60, the length of the covered stent 60, etc.

[0094] In some other embodiments, when the stent binding structure 100 only needs to bind one corrugated ring, at this time only one binding ring 20 is provided correspondingly. Then the buckle assembly 3 includes a first connecting portion 31 and a third connecting portion 33. The first connecting portion 31 connects the tail end 10 and the binding ring 20, and the third connecting portion 33 connects the binding ring 20 and the wire end 40, that is, the second connecting portion 32 may not be provided at this time.

[0095] In some embodiments, the single - knot loop 11 includes a loop body portion 112, a loop knot portion 113, and a first free segment 111. The loop knot portion 113 includes a first connecting segment 1131 and a second connecting segment 1132 that intersects the first connecting segment 1131 at a right angle. One end of the first connecting segment 1131 is connected to one end of the loop body portion 112, and the other end is connected to the first connecting portion 31. One end of the second connecting segment 1132 is connected to the other end of the loop body portion 112, and the other end is connected to one end of the first free segment 111. Moreover, the end of the first connecting segment 1131 connected to the first connecting portion 31 and the end of the second connecting segment 1132 connected to the first free segment 111 are respectively located on opposite sides of the loop body portion 112.

[0096] The single - knot loop 11 should have a certain degree of looseness, so as to avoid the single - knot loop 11 being too tight when pulling the wire end 40 for release, resulting in unsmooth release. The loop body portion 112 is C - shaped. The end of the first connecting segment 1131 connected to the first connecting portion 31 is located inside the loop body portion 112, and the end of the second connecting segment 1132 connected to the first free segment 111 is located outside the loop body portion 112.

[0097] In some embodiments, the buckle 30 includes a first U - shaped loop 301 and a back - threading segment 302. One free end of the open end of the first U - shaped loop 301 is connected to one end of the back - threading segment 302. The back - threading segment 302 is hooked to the loop body portion 112 of the single - knot loop 11, the first U - shaped loop 301 of an adjacent buckle 30, or an adjacent restraint loop 20. The other end of the back - threading segment 302 passes through the inside of the closed end of the first U - shaped loop 301 from the direction away from the tail end 10.

[0098] The first U - shaped loop 301 has a closed end and an open end. Its open end has two free ends. One free end is connected to one end of the back - threading segment 302, and the other free end is connected to other buckles 30, the tail end 10, or the restraint loop 20 depending on the position of this buckle 30. The object that the back - threading segment 302 hooks to varies depending on the position of this buckle 30. For example, taking the buckle 30 closest to the tail end 10 of the first connecting portion 31 as an example, the object that the back - threading segment 302 of this buckle 30 hooks to is the loop body portion 112 of the single - knot loop 11 at the tail end 10. See Figure 5 ; See Figure 8 Taking the buckle 30 of the second connecting portion 32 as an example, the object that this buckle 30 hooks to may be the first U - shaped loop 301 of an adjacent buckle 30 or an adjacent restraint loop 20; for the buckle 30 of the third connecting portion 33, the object that this buckle 30 hooks to may be an adjacent restraint loop 20.

[0099] In some embodiments, see Figure 4 、 Figure 5, the first connecting portion 31 includes two latches 30, namely a first latch 311 and a second latch 312. One free end of the first U-shaped loop 301 of the first latch 311 is connected to the first connecting segment 1131 of the single knot loop 11. The other end of the back-through segment 302 of the first latch 311 passes through the inside of the closed end of the first U-shaped loop 301 of the first latch 311 from the direction away from the tail end 10 and is then connected to one free end of the open end of the first U-shaped loop 301 of the second latch 312. The back-through segment 302 of the second latch 312 is hooked to the closed end of the first U-shaped loop 301 of the first latch 311. One end of the back-through segment 302 of the second latch 312 passes through the inside of the closed end of the first U-shaped loop 301 of the second latch 312 from the direction away from the tail end 10 and is then connected to the restraint loop 20 (see Figure 6 ).

[0100] The first latch 311 is arranged close to the tail end 10, and the second latch 312 is arranged close to the restraint loop 20. The back-through segment 302 of the first latch 311 is hooked to the single knot loop 11 at the tail end 10, and the back-through segment 302 of the second latch 312 is hooked to the closed end of the first U-shaped loop 301 of the first latch 311. In other embodiments, the number of latches 30 included in the first connecting portion 31 is not limited. The number of latches 30 in the first connecting portion 31 is determined according to the distance between the tail end 10 and the restraint loop 20 closest to the tail end 10. The farther the distance between the restraint loop 20 closest to the tail end 10 and the tail end 10, the longer the length of the first connecting portion 31, and correspondingly, the more latches 30 it includes. Conversely, the fewer the number included in the first connecting portion 31.

[0101] In some embodiments, see Figure 6 , Figure 7 and Figure 8 , the restraint loop 20 includes a first loop 21 connected to the first connecting portion 31 or the second connecting portion 32, and a second loop 22 connected to the first loop 21. The second loop 22 is arranged side by side with the first loop 21. The first loop 21 includes a first C-shaped loop 211, a first turning portion 212, and a first re-bending portion 213. One end of the first C-shaped loop 211 is connected to a folded segment of the first turning portion 212, and the other end is connected to one end of the first re-bending portion 213. The second loop 22 includes a second C-shaped loop 221, a second turning portion 222, and a second re-bending portion 223. One end of the second C-shaped loop 221 is connected to a folded segment of the second turning portion 222, and the other end is connected to the other end of the first re-bending portion 213. The other folded segment of the second turning portion 222 is connected to one end of the second re-bending portion 223. The second re-bending portion 223 is hooked to the first U-shaped loop 301 of the latch 30. The other end of the second re-bending portion 223 passes through the inside of the first re-bending portion 213 from the direction away from the tail end 10 and is then connected to the latch 30 of the second connecting portion 32.

[0102] When the restraint ring 20 is the restraint ring 20 closest to the tail end 10, the first ring 21 of the restraint ring 20 is connected to the first connecting portion 31 at this time. When the restraint ring 20 is not the restraint ring 20 closest to the tail end 10 but the middle restraint ring 20, the first ring 21 of the restraint ring 20 is connected to the second connecting portion 32 at this time. In this embodiment, the restraint ring 20 includes two rings, namely, the first ring 21 and the second ring 22.

[0103] Of course, in other embodiments, the number of rings included in the restraint ring 20 is not limited. Generally speaking, the more rings the restraint ring 20 includes, the stronger the restraint force on the covered stent 60 and the better the firmness of the restraint on the covered stent 60.

[0104] In this embodiment, referring to Figure 9 , two restraint rings 20 are provided. The first connecting portion 31 includes two latches 30, the second connecting portion 32 includes two latches 30, and the third connecting portion 33 includes one latch 30. One end of the first connecting portion 31 is connected to the tail end 10, and the other end is connected to the restraint ring 20 closer to the tail end 10 among the two restraint rings 20. The second connecting portion 32 connects the two restraint rings 20. One end of the third connecting portion 33 is connected to the restraint ring 20 farther from the tail end 10 among the two restraint rings 20, and the other end is connected to the tail end 40.

[0105] In some embodiments, referring to Figure 7a 、 Figure 8 , the wire pulling end 40 includes a second U-shaped ring 42, a third U-shaped ring 43, and a second free section 41. Both free ends of the open end of the second U-shaped ring 42 intersect with the inner side of the closed end of the first U-shaped ring 301 of the latch 30 farthest from the tail end 10 in the third connecting portion 33. The third U-shaped ring 43 is hooked on the closed end of the first U-shaped ring 301 of the latch 30 farthest from the tail end 10. One free end of the open end of the third U-shaped ring 43 is connected to one free end of the open end of the second U-shaped ring 42, and the other free end is connected to the second free section 41.

[0106] In this embodiment, the third connecting portion 33 includes one latch 30. Both free ends of the open end of the second U-shaped ring 42 of the wire pulling end 40 intersect with the inner side of the closed end of the first U-shaped ring 301 of the latch 30 of the third connecting portion 33. One end of the third U-shaped ring 43 is connected to the second free section 41. When the second free section 41 is pulled, the second free section 41 will first drive the third U-shaped ring 43 to be straightened, and then the straightened third U-shaped ring 43 will drive the second U-shaped ring 42 to be straightened, and then drive the back-through section 302, the first U-shaped ring 301, and the restraint ring 20 of the third connecting portion 33 to be straightened in sequence until they are pulled to the tail end 10 in sequence and drive the single knot ring 11 at the tail end 10 to be straightened, and finally released into a single wire.

[0107] Embodiment Two

[0108] See Figures 10 to 16 , the relevant schematic diagrams of the second embodiment of the bracket binding structure 100 provided for the invention. For the specific structures of the buckle 30, the tail end 10, and the wire end 40 in this embodiment, reference can be made to the first embodiment. The setting methods and structures of the first connecting portion 31, the second connecting portion 32, and the third connecting portion 33 can all refer to the first embodiment. The main difference between this embodiment and the first embodiment lies in the different structure of the binding ring 20.

[0109] In this embodiment, the binding ring 20 includes a first ring 21 connected to the first connecting portion 31 or the second connecting portion 32, and a second ring 22 connected to the first ring 21. The second ring 22 is arranged side by side with the first ring 21. The first ring 21 includes a first bending portion 214, a first ring body portion 215, and a first folding section 216. One section of the first bending portion 214 is connected to the first connecting portion 31 or the second connecting portion 32, and the other section is connected to one end of the first ring body portion 215. One end of the first folding section 216 is connected to the other end of the first ring body portion 215, and the other end is folded back and passes through the inside of the fold angle of the first bending portion 214 from the direction towards the tail end 10, and the first folding section 216 is pressed inside one section of the first bending portion 214; the second ring 22 includes a second ring body portion 224, a second bending portion 225, and a third bending section 226. One end of the second ring body portion 224 is connected to one end of the first folding section 216, and the other end is connected to one section of the second bending portion 225 from the outside of the first folding section 216. The other section of the second bending portion 225 passes through the inside of the first ring body portion 215 and the second ring body portion 224 and is connected to one end of the third bending section 226. The third bending section 226 is hooked on the first connecting portion 31 or the second connecting portion 32, and the other end of the third bending section 226 passes through the inside of the first folding section 216 from the direction away from the tail end 10 and is connected to the buckle 30 of the next second connecting portion 32.

[0110] In this embodiment, the binding ring 20 includes two rings, namely the first ring 21 and the second ring 22. Similarly, when the binding ring 20 is the binding ring 20 closest to the tail end 10, at this time, the first ring 21 of the binding ring 20 is connected to the first connecting portion 31, and the third bending section 226 of the second ring 22 is hooked on the first U-shaped ring 301 of the buckle 30 of the first connecting portion 31 that is farthest from the tail end 10; when the binding ring 20 is not the binding ring 20 closest to the tail end 10 but the middle binding ring 20, at this time, the first ring 21 of the binding ring 20 is connected to the second connecting portion 32, and the third bending section 226 of the second ring 22 is hooked on the first U-shaped ring 301 of the buckle 30 of the second connecting portion 32.

[0111] In some embodiments, the other end of the third bent portion 226 is externally pressed against the outer sides of the first bent portion 214 and the second bent portion 225. That is, in this embodiment, the other end of the third bent portion 226 passes through from the outer sides of the first bent portion 214 and the second bent portion 225 and then passes out from the inner side of the first folded segment 216. The other end of the third bent portion 226 intersects with the first bent portion 214, the second bent portion 225, and the first folded segment 216.

[0112] In other embodiments, the other end of the third bent portion 226 is internally pressed against the inner sides of the first bent portion 214 and the second bent portion 225. That is, in this embodiment, the other end of the third bent portion 226 passes through from the inner sides of the first bent portion 214 and the second bent portion 225 and then passes out from the inner side of the first folded segment 216. The other end of the third bent portion 226 intersects with the first bent portion 214, the second bent portion 225, and the first folded segment 216.

[0113] Embodiment Three

[0114] See Figures 17 to 24a , the relevant schematic diagrams of Embodiment Three of the bracket binding structure 100 provided by the invention. For the specific structures of the buckle 30, the tail end 10, and the wire-pulling end 40 in this embodiment, reference can be made to Embodiment One. The setting manners and structures of the first connecting portion 31, the second connecting portion 32, and the third connecting portion 33 can all refer to Embodiment One. The main difference between this embodiment and Embodiment One lies in the different structure of the binding ring 20.

[0115] In some embodiments, the restraint loop 20 includes a first loop 21 connected to the first connecting portion 31 or the second connecting portion 32, a second loop 22 connected to the first loop 21, a third loop 23 connected to the second loop 22, and a fourth loop 24 connected to the third loop 23. The first loop 21, the second loop 22, the third loop 23, and the fourth loop 24 are arranged side by side. The first loop 21 includes a third bending portion 217 and a third loop body section 218. One segment of the third bending portion 217 is connected to the first connecting portion 31 or the second connecting portion 32, and the other segment is connected to one end of the third loop body section 218. The second loop 22 includes a fourth loop body section 227 and a second folding section 228. One end of the fourth loop body section is connected to the other end of the third loop body section 218, and the other end is connected to one end of the second folding section 228. The third loop 23 includes a fifth loop body section 231. One end of the fifth loop body section 231 is connected to the other end of the second folding section 228, and the other end is connected to one end of the fourth loop 24. The fourth loop 24 includes a sixth loop body section 241, a fourth bending portion 242, and a third folding section 243. One end of the sixth loop body section 241 is connected to the other end of the fifth loop body section 231, and the other end is connected to one segment of the fourth bending portion 242. The other segment of the fourth bending portion 242 is connected to one end of the third folding section 243. The third folding section 243 is hooked on the first connecting portion 31 or the second connecting portion 32. The other end of the third folding section 243 passes through the inner side of the second folding section 228 in a direction away from the tail end 10 and is then connected to the buckle 30 of the next second connecting portion 32. The fourth loop body section 227 and the sixth loop body section 241 are located between the third loop body section 218 and the fifth loop body section 231.

[0116] In this embodiment, the restraint loop 20 includes four loops, namely the first loop 21, the second loop 22, the third loop 23, and the fourth loop 24. The four loops are arranged side by side. Among them, the second loop 22 and the fourth loop 24 are located between the first loop 21 and the third loop 23. Similarly, when the restraint loop 20 is the restraint loop 20 closest to the tail end 10, at this time, the first loop 21 of the restraint loop 20 is connected to the first connecting portion 31, and the third folding section 243 of the fourth loop 24 is hooked on the first U-shaped ring 301 of the buckle 30 of the first connecting portion 31 that is farthest from the tail end 10. When the restraint loop 20 is not the restraint loop 20 closest to the tail end 10 but is an intermediate restraint loop 20, at this time, the first loop 21 of the restraint loop 20 is connected to the second connecting portion 32, and the third folding section 243 of the fourth loop 24 is hooked on the first U-shaped ring 301 of the buckle 30 of the second connecting portion 32.

[0117] In some embodiments, the other end of the third folded section 243 is externally pressed against the outer sides of the fourth ring body section 227 of the second ring 22 and the sixth ring body section 241 of the fourth ring 24. That is, in this embodiment, the other end of the third folded section 243 passes through from the outer sides of the fourth ring body section 227 of the second ring 22 and the sixth ring body section 241 of the fourth ring 24 and then passes out from the inner side of the second folded section 228. The other end of the third folded section 243 intersects with the fourth ring body section 227, the sixth ring body section 241, and the second folded section 228.

[0118] In some embodiments, the other end of the third folded section 243 is internally pressed against the inner sides of the fourth ring body section 227 of the second ring 22 and the sixth ring body section 241 of the fourth ring 24. That is, in this embodiment, the other end of the third folded section 243 passes through from the inner sides of the fourth ring body section 227 of the second ring 22 and the sixth ring body section 241 of the fourth ring 24 and then passes out from the inner side of the second folded section 228. The other end of the third folded section 243 intersects with the fourth ring body section 227, the sixth ring body section 241, and the second folded section 228.

[0119] Embodiment 4

[0120] See Figures 25 to 31 , the relevant schematic diagrams of Embodiment 4 of the stent restraint structure 100 provided by the invention. The specific structures of the buckle 30, the tail end 10, and the wire end 40 in this embodiment can refer to Embodiment 1. The setting methods and structures of the first connecting portion 31, the second connecting portion 32, and the third connecting portion 33 can all refer to Embodiment 1. The main difference between this embodiment and Embodiment 1 lies in the different structures of the restraint ring 20.

[0121] In some embodiments, the binding ring 20 includes a first ring 21 connected to the first connecting portion 31 or the second connecting portion 32, a second ring 22 connected to the first ring 21, a third ring 23 connected to the second ring 22, and a fourth ring 24 connected to the third ring 23. The first ring 21, the second ring 22, the third ring 23, and the fourth ring 24 are arranged side by side. The first ring 21 includes a fifth bending portion 251 and a seventh ring body portion 252. One folded segment of the fifth bending portion 251 is connected to the first connecting portion 31 or the second connecting portion 32, and the other folded segment is connected to one end of the seventh ring body portion 252. The second ring 22 includes an eighth ring body portion 253 and a fourth return folding segment 254. One end of the eighth ring body portion 253 is connected to the other end of the seventh ring body portion 252, and the other end is connected to one end of the fourth return folding segment 254. The other end of the fourth return folding segment 254 passes through the bending portion of the fifth bending portion 251 and is externally pressed against one folded segment of the fifth bending portion 251. The third ring 23 includes a ninth ring body portion 255. One end of the ninth ring body portion 255 is connected to the fourth return folding segment 254, and the other end is connected to one end of the fourth ring 24. The fourth ring 24 includes a tenth ring body portion 256, a sixth bending portion 257, and a fifth return folding segment 258. One end of the tenth ring body portion 256 is connected to one end of the ninth ring body portion 255 of the third ring 23, and the other end is connected to one folded segment of the sixth bending portion 257. The other folded segment of the sixth bending portion 257 is connected to one end of the fifth return folding segment 258. The fifth return folding segment 258 is hooked on the first U-shaped ring 301 of the buckle 30 that is farthest from the tail end 10 of the first connecting portion 31 or the second connecting portion 32. The other end of the fifth return folding segment 258 passes through the ring formed by enclosing the sixth bending portion 257 and the fourth return folding segment 254 from the outside of the ring body portions of the first ring 21, the second ring 22, the third ring 23, and the fourth ring 24 and then extends to be connected to the buckle 30 of the next second connecting portion 32.

[0122] In this embodiment, the binding ring 20 includes four rings, namely the first ring 21, the second ring 22, the third ring 23, and the fourth ring 24. The four rings are arranged side by side. Among them, the first ring 21 and the third ring 23 are located between the second ring 22 and the fourth ring 24. Similarly, when the binding ring 20 is the binding ring 20 closest to the tail end 10, at this time, the first ring 21 of the binding ring 20 is connected to the first connecting portion 31, and the fifth return folding segment 258 of the fourth ring 24 is hooked on the first U-shaped ring 301 of the buckle 30 that is farthest from the tail end 10 of the first connecting portion 31. When the binding ring 20 is not the binding ring 20 closest to the tail end 10 but the middle binding ring 20, at this time, the first ring 21 of the binding ring 20 is connected to the second connecting portion 32, and the third return folding segment 243 of the fourth ring 24 is hooked on the first U-shaped ring 301 of the buckle 30 of the second connecting portion 32. In this embodiment, the next second connecting portion 32 refers to the second connecting portion 32 that is adjacent to this second connecting portion 32 and is closer to the wire drawing end 40 side.

[0123] See Figure 31 , the present invention also provides a covered stent system 600. The covered stent system 600 includes a covered stent 60 and the above-mentioned stent restraint structure 100. The covered stent 60 includes a tubular main body 61. The tail end 10 of the stent restraint structure 100 is located at one end of the tubular main body 61. Each restraint ring 20 is sleeved on the outer periphery of the tubular main body 61. The wire end 40 of the stent restraint structure 100 is located at the other end of the tubular main body 61. The restraint ring 20 can be sleeved on the corrugation 611 of the covered stent 60 to compress and restrain the covered stent 60. When the wire end 40 of the stent restraint structure 100 is pulled, the stent restraint structure 100 is released into a single wire, and the corrugation 611 of the covered stent 60 freely expands and returns to its natural state. By sleeving the above-mentioned stent restraint structure 100 on the covered stent 60, when withdrawing the wire, it is only necessary to pull the wire end 40 to release it into a single wire, and there will be no problem of the stent being helically wound. The problem of difficulty in wire extraction caused by the covered stent 60 being wound into a helix during wire withdrawal can be effectively avoided. No foreign body remains in the body after the operation, which can effectively improve the success rate and efficiency of the operation and reduce surgical residues.

[0124] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stent restraint structure, characterized in that , used for radially restraining the coated stent, the stent restraining structure includes: A tail end, the tail end comprising a single knot loop, the single knot loop having a first free section; At least one restraining ring, the restraining ring being used to be circumferentially arranged around the outer periphery of the stent graft to bind and restrain the stent graft; A locking assembly, the locking assembly being used to connect the tail end with the restraining ring; The pull wire end is connected to the restraining ring farthest from the tail end through the locking assembly, and the end of the pull wire end away from the locking assembly is a second free section. The locking assembly and each restraining ring are located between the tail end and the pull wire end. By pulling the second free section, each restraining ring and the locking assembly can be released in turn and released into an uncoiled line connected to the second free section.

2. The stent restraint structure according to claim 1, characterized in that There are multiple restraining rings, and the locking assembly includes a first connecting part, at least one second connecting part and a third connecting part. The first connecting part is used to connect the tail end and the restraining ring closest to the tail end, the second connecting part is used to connect two adjacent restraining rings, and the third connecting part is used to connect the restraining ring farthest from the tail end and the pull wire end. The first connecting part, the second connecting part and the third connecting part each include at least one locking part.

3. The stent restraint structure according to claim 2, wherein The single knot ring includes a ring body, a ring knot and the first free segment, the ring knot includes a first connecting segment and a second connecting segment cross-intersecting the first connecting segment, one end of the first connecting segment is connected to one end of the ring body, and the other end is connected to the first connecting segment, one end of the second connecting segment is connected to the other end of the ring body, and the other end is connected to one end of the first free segment, and one end of the first connecting segment connected to the first connecting segment and one end of the second connecting segment connected to the first free segment are respectively located on opposite sides of the ring body.

4. The stent restraint structure according to claim 3, wherein The lock buckle includes a first U-shaped ring and a back-penetrating section, a free end of the open end of the first U-shaped ring is connected to one end of the back-penetrating section, the back-penetrating section is hooked on the ring body of the single knot ring, the adjacent first U-shaped ring of the lock buckle, or the adjacent binding ring, and the other end of the back-penetrating section passes through the inner side of the closed end of the first U-shaped ring from the direction away from the tail end.

5. The stent binding structure according to claim 4, characterized in that The first connecting part includes two locking buckles, namely a first locking buckle and a second locking buckle. A free end of the first U-shaped ring of the first locking buckle is connected to the first connecting section of the single knot ring. The other end of the back-penetrating section of the first locking buckle passes through the inner side of the closed end of the first U-shaped ring of the first locking buckle from the direction away from the tail end and is connected to a free end of the open end of the first U-shaped ring of the second locking buckle. The back-penetrating section of the second locking buckle is hooked on the first U-shaped ring of the first locking buckle. One end of the back-penetrating section of the second locking buckle passes through the inner side of the closed end of the first U-shaped ring of the second locking buckle from the direction away from the tail end and is connected to the restraining ring.

6. The stent binding structure according to claim 5, wherein , The restraint ring includes a first ring connected to the first connecting portion or the second connecting portion, and a second ring connected to the first ring. The second ring is arranged side by side with the first ring. The first ring includes a first C-shaped ring, a first turning portion, and a first return bend portion. One end of the first C-shaped ring is connected to a folded segment of the first turning portion, and the other end is connected to one end of the first return bend portion; The second ring includes a second C-shaped ring, a second turning portion, and a second return bend portion. One end of the second C-shaped ring is connected to a folded segment of the second turning portion, and the other end is connected to the other end of the first return bend portion. The other folded segment of the second turning portion is connected to one end of the second return bend portion. The second return bend portion is hooked on the first U-shaped ring of the buckle, and the other end of the second return bend portion passes through the inside of the first return bend portion from the direction away from the tail end and is connected to the buckle of the next second connecting portion or the third connecting portion.

7. The stent constraint structure according to claim 5, characterized in that , The restraint ring includes a first ring connected to the first connecting portion or the second connecting portion, and a second ring connected to the first ring. The second ring is arranged side by side with the first ring. The first ring includes a first bending portion, a first ring body segment, and a first return folding segment. One folded segment of the first bending portion is connected to the first connecting portion or the second connecting portion, and the other folded segment is connected to one end of the first ring body segment. One end of the first return folding segment is connected to the other end of the first ring body segment, and the other end returns and passes through the inside of the fold angle of the first bending portion from the direction towards the tail end, and the first return folding segment is pressed inside the folded segment of the first bending portion; The second ring includes a second ring body segment, a second bending portion, and a third return bend portion. One end of the second ring body segment is connected to one end of the first return folding segment, and the other end is connected to a folded segment of the second bending portion from the outside of the first return folding segment. The other folded segment of the second bending portion passes through the inside of the first ring body segment and the second ring body segment and is connected to one end of the third return bend portion. The third return bend portion is hooked on the first connecting portion or the second connecting portion, and the other end of the third return bend portion passes through the inside of the first return folding segment from the direction away from the tail end and is connected to the buckle of the next second connecting portion or the third connecting portion.

8. The stent constraint structure according to claim 7, wherein , The other end of the third return bend portion is pressed outside the first bending portion and the second bending portion.

9. The stent binding structure according to claim 7, wherein , The other end of the third return bend portion is pressed inside the first bending portion and the second bending portion.

10. The stent binding structure according to claim 5, wherein , The restraint ring includes a first ring connected to the first connecting portion or the second connecting portion, a second ring connected to the first ring, a third ring connected to the second ring, and a fourth ring connected to the third ring. The first ring, the second ring, the third ring, and the fourth ring are arranged side by side. The first ring includes a third bending portion and a third ring body segment. One folded segment of the third bending portion is connected to the first connecting portion or the second connecting portion, and the other folded segment is connected to one end of the third ring body segment; The second ring includes a fourth ring body section and a second folding section. One end of the fourth ring body section is connected to the other end of the third ring body section, and the other end is connected to one end of the second folding section. The third ring includes a fifth ring body section. One end of the fifth ring body section is connected to the other end of the second folding section, and the other end is connected to one end of the fourth ring. The fourth ring includes a sixth ring body section, a fourth bending portion, and a third folding section. One end of the sixth ring body section is connected to the other end of the fifth ring body section, and the other end is connected to a folding section of the fourth bending portion. The other folding section of the fourth bending portion is connected to one end of the third folding section. The third folding section is hooked to the first connection portion or the second connection portion. The other end of the third folding section passes through the inside of the second folding section from the direction away from the tail end and is then connected to the buckle of the next second connection portion or third connection portion. The fourth ring body section and the sixth ring body section are located between the third ring body section and the fifth ring body section.

11. The stent restraint structure according to claim 10, characterized in that , The other end of the third folding section is externally pressed against the outer sides of the fourth ring body section of the second ring and the sixth ring body section of the fourth ring.

12. The stent binding structure according to claim 10, wherein , The other end of the third folding section is internally pressed against the inner sides of the fourth ring body section of the second ring and the sixth ring body section of the fourth ring.

13. The stent constraint structure according to claim 5, characterized in that , The restraint ring includes a first ring connected to the first connection portion or the second connection portion, a second ring connected to the first ring, a third ring connected to the second ring, and a fourth ring connected to the third ring. The first ring, the second ring, the third ring, and the fourth ring are arranged side by side. The first ring includes a fifth bending portion and a seventh ring body section. One folding section of the fifth bending portion is connected to the first connection portion or the second connection portion, and the other folding section is connected to one end of the seventh ring body section. The second ring includes an eighth ring body section and a fourth folding section. One end of the eighth ring body section is connected to the other end of the seventh ring body section, and the other end is connected to one end of the fourth folding section. The other end of the fourth folding section passes through the bending portion of the fifth bending portion and is externally pressed against one folding section of the fifth bending portion. The third ring includes a ninth ring body section. One end of the ninth ring body section is connected to the fourth folding section, and the other end is connected to one end of the fourth ring. The fourth ring includes a tenth ring body section, a sixth bending portion, and a fifth folding section. One end of the tenth ring body section is connected to one end of the ninth ring body section of the third ring, and the other end is connected to a folding section of the sixth bending portion. The other folding section of the sixth bending portion is connected to one end of the fifth folding section. The fifth folding section is hooked to the first U-shaped ring of the buckle of the first connection portion or the second connection portion that is farthest from the tail end. The other end of the fifth folding section passes through the ring formed by enclosing the sixth bending portion and the fourth folding section from the outer sides of the ring body sections of the first ring, the second ring, the third ring, and the fourth ring and then extends to be connected to the buckle of the next second connection portion or third connection portion.

14. The stent binding structure according to any one of claims 5 to 13, characterized in that , The cable end includes a second U-shaped ring, a third U-shaped ring and the second free section. Both free ends of the open end of the second U-shaped ring intersect with the inner side of the closed end of the first U-shaped ring of the buckle that is farthest from the tail end in the third connecting portion. The third U-shaped ring is hooked on the closed end of the first U-shaped ring of the buckle that is farthest from the tail end. One free end of the open end of the third U-shaped ring is connected to one free end of the open end of the second U-shaped ring, and the other free end is connected to the second free section.

15. A covered stent system, characterized in that , It includes a covered stent and a stent restraint structure as described in any one of claims 1 to 14 connected to the covered stent. The covered stent includes a tubular body. The restraint rings are circumferentially wound around the outer periphery of the tubular body of the covered stent to bundle and restrain the covered stent. The tail end is located at one end of the tubular body, and the cable end is located at the other end of the tubular body. By pulling the cable end, each of the restraint rings and the buckle assembly can be sequentially released and released into an unknotted line connected to the second free section of the cable end.

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