Support frame, covered stent, release device and vascular treatment assembly

Abstract

The present invention discloses a support skeleton, a coated stent, a release device and a vascular treatment component, which belong to the field of medical device technology, wherein the support skeleton includes a fixed rod, a sliding rod and a spiral support spring, all of which are made of memory alloy. A fixed portion and a sliding portion are correspondingly provided on each layer of spiral coil of the spiral support spring. The fixed portion is fixedly connected to the fixed rod, and the sliding portion is slidably connected to the sliding rod. Two adjacent sliding portions are supported by an elastic reset member. Both ends of the sliding rod and the fixed rod are used to be fixedly connected to the two ends of the inner wall of the tubular coating. The spiral support spring is used to be coaxially arranged with the tubular coating. Compared with the Z-shaped wire-wound stent, it can provide continuous support for the coating, and there will be no problem of coating bending between adjacent Z-shaped wire-wound stents. At the same time, it has good flexibility and radial support capacity, can better fit the coating to provide support force, and will not have the problem of poor wall adhesion of the coated stent using the Z-shaped wire-wound stent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a support skeleton, a coated stent, a release device and a vascular treatment component. Background Art

[0002] Stent grafts are commonly used medical devices for endovascular treatment of patients with thoracic aortic dissection or aneurysm. For thoracic aortic dissection, a stent graft is typically implanted at the site of the aortic dissection lesion. The stent graft supports the vessel wall, seals the lesion, isolates blood flow from the false lumen, and promotes embolization of the false lumen. For patients with aneurysms, deploying the stent graft at the site of the lesion effectively protects the aortic aneurysm wall from systemic arterial pressure, thereby preventing aortic aneurysm rupture.

[0003] Most of the existing covered stents use a multi-section Z-shaped wire-wound stent as the skeleton, and then apply a film inside or outside the skeleton. However, there are many problems with the Z-shaped wire-wound stent: First, the Z-shaped wire-wound stent has poor adhesion to the blood vessel wall. In order to improve the adhesion between the Z-shaped wire-wound stent and the blood vessel wall, the number of peaks of the Z-shaped wire-wound stent needs to be increased. For example, the wall adhesion of a 12-peak stent is better than that of a 6-peak stent. However, the increase in the number of peaks will lead to a decrease in the radial support force of the stent, making it impossible to form an effective blood flow blockage, and will increase the radial compression volume of the stent, resulting in the stent being unable to be compressed into the outer tube of the small-diameter conveyor and cannot be implanted into the patient's body through intervention. Second, there is no connection between the Z-shaped wire-wound stent and the Z-shaped wire-wound stent. When the covered stent is implanted into a blood vessel with a larger curvature, the film between the Z-shaped wire-wound stent and the Z-shaped wire-wound stent is prone to folding (inward or outward), thereby affecting the internal hemodynamics of the covered stent and even causing thrombosis. While reducing the distance between the two sections of the stent can improve the problem of folding of the coating, it will affect the overall flexibility of the stent. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems and provide a support skeleton, a coated stent, a release device and a vascular treatment component. The support skeleton used can provide continuous support for the coating, and there will be no problem of coating bending between adjacent Z-shaped wire-wound stents. At the same time, it has good flexibility and radial support capability, and can better fit the coating to provide support force, and there will be no problem of poor wall adhesion of the coated stent using the Z-shaped wire-wound stent.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention discloses a supporting skeleton, comprising a fixed rod, a sliding rod and a helical support spring, all of which are made of memory alloy, wherein each layer of the helical coil of the helical support spring is correspondingly provided with a fixed portion and a sliding portion, the fixed portion and the sliding portion are arranged on both sides of the central axis of the helical support spring, the fixed portion is fixedly connected to the fixed rod, the sliding portion is slidably connected to the sliding rod, and two adjacent sliding portions are supported by an elastic reset member, the sliding rod and the fixed rod both extend along the central axis of the helical support spring, both ends of the sliding rod and the fixed rod are used to be fixedly connected to the two ends of the inner wall of the tubular coating, and the central axis of the helical support spring is used to be coaxially arranged with the central axis of the tubular coating.

[0006] Preferably, the fixing portion is a fixing groove convex inwardly toward the central axis of the helical support spring, and the sliding portion is a sliding groove convex inwardly toward the central axis of the helical support spring.

[0007] Preferably, the elastic reset member is a helical reset spring sleeved on the sliding rod.

[0008] Preferably, both ends of the spiral support spring are provided with fixing rings, and the fixing rod is passed through and fixed in the fixing rings.

[0009] The present invention also discloses a stent graft comprising a tubular stent graft and the above-mentioned support frame, wherein the support frame is located inside the tubular stent graft.

[0010] The present invention also discloses a release device, comprising a restraining ring, a guide member and a restraining wire made of a memory alloy; the restraining ring is arranged on the tubular coating of the above-mentioned coated bracket, the restraining ring is located at the end of the tubular coating away from the operator, and the restraining ring is arranged along the circumferential spacing of the tubular coating; the guide member comprises a guide head, a restraining seat and a guide wire tube which are arranged in sequence from away to close to the operator, the guide head and the restraining seat both have a center hole coaxially arranged with the guide wire tube, the restraining seat is provided with a restraining column for the restraining ring to be sleeved, and the restraining column is provided with a through hole; the restraining wire comprises a restraining end and a pulling end for the operator to pull, the restraining end is bent into a ring shape and passes through the through holes of all the restraining columns in sequence, and the restraining end is located on the moving path of the restraining ring along the outward movement of the restraining column.

[0011] Preferably, the restraint ring and the tubular covering are fixed by suturing with soft thread.

[0012] Preferably, the through hole is an arc-shaped hole.

[0013] Preferably, a guide block is provided on the constraint seat, and the constraint column and the guide block are arranged in sequence along the axial direction of the constraint seat. The guide block is close to the operator, and the guide block corresponds to between two adjacent constraint columns, and one of the guide blocks is provided with a guide hole for the pulling end to pass through.

[0014] The present invention also discloses a vascular treatment assembly, comprising the above-mentioned covered stent and the above-mentioned releasing device.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] Compared with the Z-shaped wire-wound stent, the support skeleton of the present invention can provide continuous support for the membrane, and the problem of membrane bending between adjacent Z-shaped wire-wound stents will not occur. At the same time, it has good flexibility and radial support capability, and can better fit the membrane to provide support force, and the problem of poor wall adhesion of the membrane stent using the Z-shaped wire-wound stent will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the analysis of these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the three-dimensional structure of the stent graft in an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the front structure of the stent graft in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the front structure of the support frame in an embodiment of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of a local enlarged structure;

[0022] Figure 5 is a schematic diagram of the three-dimensional structure of the support frame in an embodiment of the present invention;

[0023] Figure 6 for Figure 5 Schematic diagram of a local enlarged structure;

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the helical support spring in an embodiment of the present invention;

[0025] Figure 8 for Figure 7Schematic diagram of a local enlarged structure;

[0026] Figure 9 Schematic diagram of the top view of the helical support spring in an embodiment of the present invention;

[0027] Figure 10 Schematic diagram of the diameter reduction process of the support frame in an embodiment of the present invention;

[0028] Figure 11 for Figure 2 Schematic diagram of a local enlarged structure;

[0029] Figure 12 for Figure 11 Schematic diagram of a local enlarged structure;

[0030] Figure 13 is a schematic diagram of the three-dimensional structure of the release device in an embodiment of the present invention;

[0031] Figure 14 is a schematic cross-sectional structural diagram of a release device in an embodiment of the present invention;

[0032] Figure 15 for Figure 14 Schematic diagram of a local enlarged structure;

[0033] Figure 16 Schematic diagram of the three-dimensional structure of the restraint seat in an embodiment of the present invention;

[0034] Figure 17 is a cross-sectional schematic diagram of a restraining seat in an embodiment of the present invention;

[0035] Figure 18 Schematic diagram of the matching relationship between the restraint seat and the restraint wire in an embodiment of the present invention;

[0036] Figure 19 Schematic diagram of the cooperation between the release device and the stent graft in an embodiment of the present invention;

[0037] Figure 20 for Figure 19 Schematic diagram of the local enlarged structure.

[0038] Explanation of the accompanying drawings: 1. Tubular coating; 2. Fixed rod; 3. Sliding rod; 4. Helical support spring; 5. Fixed groove; 6. Sliding groove; 7. Helical return spring; 8. Fixed ring; 9. Constraint ring; 10. Soft wire; 11. Guide head; 12. Constraint seat; 13. Wire guide tube; 14. Constraint column; 15. Constraint wire; 16. Guide block; 17. Through hole; 18. Guide hole. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] The purpose of the present invention is to provide a support skeleton, a coated stent, a release device and a vascular treatment component to solve the problems existing in the prior art. Compared with the Z-shaped wire-wound stent, the support skeleton can provide continuous support for the coating, and there will be no problem of coating bending between adjacent Z-shaped wire-wound stents. At the same time, it has good flexibility and radial support capability, can better fit the coating to provide support force, and will not have the problem of poor wall adhesion of the coated stent using the Z-shaped wire-wound stent.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] like Figures 1 to 20 As shown, this embodiment provides a support skeleton, including a fixed rod 2, a sliding rod 3 and a coil support spring 4. The fixed rod 2, the sliding rod 3 and the coil support spring 4 are all made of memory alloy. A fixed part and a sliding part are correspondingly provided on each layer of the coil wire of the coil support spring 4. The fixed part and the sliding part are arranged on both sides of the central axis of the coil support spring 4. The fixed part is fixedly connected to the fixed rod 2 to ensure that the unilateral pitch of each layer of the coil wire of the coil support spring 4 remains unchanged. The structural form of the fixed part is set as needed, as long as it can be fixed, for example: a fixed groove 5. The sliding part is slidably connected to the sliding rod 3, and its structural form is set as needed, as long as it can slide, for example: a sliding groove 6. Two adjacent sliding parts are supported by an elastic reset component. The sliding rod 3 and the fixed rod 2 both extend along the central axis of the coil support spring 4. The two ends of the sliding rod 3 are used to be fixedly connected to the two ends of the inner wall of the tubular covering 1 respectively, and the part between the two ends of the sliding rod 3 is not connected to the inner wall of the tubular covering 1 to avoid the interference of the spiral support spring 4 with the inner wall of the tubular covering 1 and the inability to slide during the compression process. Similarly, the fixed rod 2 is used to be fixedly connected to the two ends of the inner wall of the tubular covering 1 respectively, and the part between the two ends of the fixed rod 2 is not connected to the inner wall of the tubular covering 1. The central axis of the spiral support spring 4 is used to be coaxially arranged with the central axis of the tubular covering 1.

[0044] Working principle:

[0045] When in use, a tubular covering 1 needs to be provided outside the supporting frame, and the tubular covering 1 and the supporting frame together constitute a covered stent.

[0046] When the stent graft needs to be compressed, the distance between the sliding rod 3 and the fixed rod 2 becomes smaller, the spiral support spring 4 is subjected to radial pressure, the fixed portion of the spiral support spring 4 and the fixed rod 2 remain fixed, the pitch of the spiral support spring 4 on this side remains unchanged, the sliding portion of the spiral support spring 4 slides on the sliding rod 3 along the axial direction of the sliding rod 3, the spiral support spring 4 is deformed, and the overall diameter of the spiral support spring 4 becomes smaller (such as Figure 10 As shown, the greater the sliding distance of the sliding portion, the smaller the overall diameter of the helical support spring 4, and consequently, the smaller the diameter of the stent graft. When the stent graft is released, the elastic return member between two adjacent sliding portions provides a return force for the sliding portions, causing the helical support spring 4 to return to its original shape. Of course, the helical support spring 4 is made of a memory alloy and has a certain degree of return capability.

[0047] When the coated stent encounters a curved blood vessel, the sliding rod 3, the fixed rod 2 and the spiral support spring 4 will bend accordingly. Compared with the Z-shaped wire-wound stents arranged at intervals, the sliding rod 3, the fixed rod 2 and the spiral support spring 4 all provide continuous support, and there is no problem of bending of the coating between adjacent Z-shaped wire-wound stents, such as inward or outward bending.

[0048] Compared with the Z-shaped wire-wound stent, this support skeleton can provide continuous support for the membrane, so there will be no problem of the membrane bending between two adjacent Z-shaped wire-wound stents. At the same time, the spiral support spring 4 has good flexibility and radial support ability, which can better fit the membrane and provide support force. The problem of poor adhesion of the membrane supported by the Z-shaped wire-wound stent to the wall of the blood vessel will not occur. Compared with the pure spring stent, this support skeleton can produce radial compression performance to meet the radial compression requirements of the membrane stent. At the same time, the unilateral pitch of the spiral support spring 4 remains unchanged (the fixed part and the fixed rod 2 are fixed), which avoids axial elongation or shortening during operation and ensures the axial length of the membrane stent during compression and release.

[0049] In one embodiment, the fixing portion is a fixing groove 5 that is convex toward the central axis of the helical support spring 4. The fixing groove 5 is clamped on the fixing rod 2 and fixed, and welding or gluing can be used for fixation. The sliding portion is a sliding groove 6 that is convex toward the central axis of the helical support spring 4. The sliding groove 6 is sleeved on the sliding rod 3 so as to slide along the sliding rod 3. The fixing portion and the sliding portion adopt the groove form of the fixing groove 5 and the sliding groove 6. The groove can make the helical support spring 4 more easily deformed when radially compressed, so that the support skeleton has a smaller radial compression volume, and the coated stent can be compressed into the outer tube of the conveyor with a smaller diameter.

[0050] In one embodiment, the helical support spring 4 is wound from a single shape memory alloy wire. The fixed grooves 5 and sliding grooves 6 are formed by inwardly concavely forming the shape memory alloy wire during the winding process. All fixed grooves 5 on the helical support spring 4 are located on the same central axis, and all sliding grooves 6 on the helical support spring 4 are located on the same central axis.

[0051] In one embodiment, the fixing groove 5 and the sliding groove 6 are U-shaped grooves or C-shaped grooves.

[0052] In one embodiment, the elastic reset member is a coil reset spring 7, which is sleeved on the sliding rod 3. The coil reset spring 7 is also made of memory alloy.

[0053] In one embodiment, both ends of the helical support spring 4 are provided with a fixing ring 8, through which the fixing rod 2 passes and is fixed, and the fixing can be performed by welding or gluing. The fixing groove 5 of the fixing ring 8 is coaxially arranged with the central axis of the fixing groove 5.

[0054] In one embodiment, the rigidity of the fixed rod 2 and the sliding rod 3 is greater than the rigidity of each layer of the helical coils of the helical support spring 4, so that the helical coils of the helical support spring 4 deform before the fixed rod 2 and the sliding rod 3, thereby ensuring that the sliding groove 6 can slide smoothly along the sliding rod 3. To ensure that the rigidity of the fixed rod 2 and the sliding rod 3 is greater than the rigidity of each layer of the helical coils of the helical support spring 4, there are two main approaches: first, starting with the material itself, the rigidity of the fixed rod 2 and the sliding rod 3 is greater than the material of the helical support spring 4; second, starting with the structure, such as starting with the diameter of the fixed rod 2 and the sliding rod 3 being greater than the diameter of the helical coils of the helical support spring 4 (i.e., the diameter of a single shape memory alloy wire). Because the fixed rod 2, the sliding rod 3, and the helical support spring 4 are generally made of the same shape memory alloy (for various factors such as cost), it is more appropriate to make the diameter of the fixed rod 2 and the sliding rod 3 larger than the diameter of the helical coils of the helical support spring 4.

[0055] Example 2

[0056] like Figures 1 to 20As shown, this embodiment provides a stent graft, comprising a tubular coating 1 and the support frame in Example 1, the support frame is located inside the tubular coating 1, the two ends of the sliding rod 3 are fixedly connected to the two ends of the inner wall of the tubular coating 1, and the two ends of the fixed rod 2 are fixedly connected to the two ends of the inner wall of the tubular coating 1, while the sliding rod 3 and the fixed rod 2 are respectively arranged on both sides of the central axis of the tubular coating 1, and the central axis of the spiral support spring 4 is coaxially arranged with the central axis of the tubular coating 1. The axial length of the sliding rod 3 and the fixed rod 2 is equal to or equal to the axial length of the tubular coating 1. The tubular coating 1 can be made of the material currently used for the stent graft. The stent graft is supported by the support frame in Example 1, so the problem of coating bending and poor adhesion to the blood vessel of the Z-shaped wire wound stent will not occur.

[0057] Example 3

[0058] like Figures 1 to 20 As shown, this embodiment provides a release device, including a restraint ring 9, a guide member and a restraint wire 15. The restraint ring 9 is arranged on the tubular covering 1 of the stent graft in Example 2, and the restraint ring 9 is located at the end of the tubular covering 1 away from the operator. The restraint ring 9 is arranged along the circumferential spacing of the tubular covering 1. The number of restraint rings 9 is set as needed, and at least three restraint rings 9 are provided. The guide member includes a guide head 11, a restraint seat 12 and a guide wire tube 13. The guide head 11, the restraint seat 12 and the guide wire tube 13 are arranged in sequence from away to close to the operator. The guide head 11 and the restraint seat 12 both have a center hole, and the center hole of the guide head 11 and the center hole of the restraint seat 12 are both coaxially arranged with the guide wire tube 13 for passing the guide wire during the operation. A restraint column 14 is provided on the restraint seat 12, and the restraint column 14 is provided for the restraint ring 9 to be mounted. The position and number of the restraint column 14 match the restraint ring 9, and the restraint column 14 is circumferentially arranged on the restraint seat 12. The constraint column 14 is provided with a through hole 17 for the constraint wire 15 to pass through. The constraint wire 15 is made of memory alloy, and includes a constraint end and a pulling end. The constraint end is bent into a ring shape and passes through the through holes 17 of all the constraint columns 14 in turn. The constraint end passing through the hole 17 is located on the moving path of the constraint ring 9 along the constraint column 14 to prevent the constraint ring 9 from detaching from the constraint column 14, and is the pulling end for the operator to pull. The operator applies force and pulls the pulling end outward, and the constraint wire 15 moves outward as a whole, and the constraint ends detach from the through holes 17 in turn. The constraint ring 9 that loses the constraint of the constraint wire 15 will detach from the constraint column 14 under the reset force of the coated stent (support frame). When all the constraint rings 9 detach from the constraint column 14, the release of the coated stent is completed.

[0059] There are two main traditional release methods:

[0060] One method is to sew a bare stent on the end of the stent graft away from the operator. The bare stent is connected to a steel claw (or steel wire) and a hidden steel claw (or steel wire). The steel claw or steel wire is fixed to another tube, and the tube is sleeved on the outside of the guide wire tube. The bare stent can make the end of the stent graft away from the operator converge, which is convenient for inserting into the outer tube of the conveyor. By pulling the tube, the steel claw or steel wire is withdrawn to complete the post-release of the stent graft. However, the bare stent will increase the overall rigidity of the outer tube, making it difficult for the conveyor to bend and pass through the arch. The bare stent will also continuously stimulate the aortic wall, causing the formation of new aortic ruptures. In addition, since another tube is added to the outside of the guide wire tube, the rigidity of the conveyor will also increase, making it difficult to bend.

[0061] Another method is to replace the bare stent with a coil. When the release device is accidentally triggered and pulled back, the first section of the Z-shaped wire-wound stent at the end of the coated stent away from the operator will be pulled into the coating, causing inversion.

[0062] This release device, however, eliminates the need for a bare stent and instead encloses the remaining tubular body. The covered stent can be released later by pulling the restraining wire 15, ensuring smooth delivery. Furthermore, because the covered stent's support framework utilizes a fixed rod 2, a sliding rod 3, and a helical support spring 4, the Z-shaped wire-wound stent, facing away from the operator, cannot invert. Furthermore, the restraining ring 9 is flexibly connected to the graft, preventing the bare stent from damaging the vessel later.

[0063] In one embodiment, the restraint ring 9 and the tubular covering 1 are sutured and fixed by means of a soft wire 10. The tubular covering 1 comprises at least three turns of soft wire 10 in the axial direction, and then a plurality of coils are spirally wound around the outer circumference of the turns of soft wire 10, such as Figure 12 As shown, this ensures that when the tubular coating 1 is pulled, the restraining ring 9 and the tubular coating 1 will not move relative to each other in the axial direction.

[0064] In one embodiment, the restraint base 12 is further provided with a guide block 16. The restraint posts 14 and guide block 16 are sequentially arranged along the axial direction of the restraint base 12. The restraint posts 14 and guide blocks 16 are positioned such that the guide block 16 is closer to the operator and farther from the operator, with the guide block 16 positioned between two adjacent restraint posts 14. One of the guide blocks 16 is provided with a guide hole 18 for the pulling end to pass through, thereby guiding the pulling direction. The central axis of the guide hole 18 is parallel to the central axis of the restraint base 12.

[0065] In one embodiment, the guide block 16 is a sector-shaped piece, and the gap between two adjacent guide blocks 16 is used to accommodate the flexible wire 10 .

[0066] In one embodiment, the diameter of the circumscribed circle of the restraint seat 12 (including the guide block 16 and the restraint column 14) is smaller than the diameter of the tubular coating 1, and the smaller the better, to ensure smooth insertion into the outer tube of the conveyor and maximize the flexibility of the conveying system.

[0067] In one embodiment, the restraint seat 12 is metal, and the guide head 11 is made of soft rubber. The restraint seat 12 and guide head 11 are connected by injection molding. A T-shaped head and T-shaped slot fit between the restraint seat 12 and guide head 11 to prevent axial displacement. The cross-sections of the T-shaped head and the T-shaped slot are rectangular, preventing relative rotation between the two.

[0068] In one embodiment, the restraining force of the restraining end of the restraining wire 15 in its natural state is greater than the radial repelling force exerted by the stent graft as a whole on the restraining ring 9. Typically, the radial repelling force of the stent graft is between 50N and 100N. For example, if the radial repelling force of the stent graft is 50N, the restraining force of the restraining end of the restraining wire 15 should be greater than 50N.

[0069] In one embodiment, the through holes 17 are arc-shaped holes. The through holes 17 of the plurality of constraint posts 14 are arranged on the same ring.

[0070] Example 4

[0071] like Figures 1 to 20 As shown, this embodiment provides a vascular treatment assembly, including the stent graft in Example 2 and the release device in Example 3. The stent graft and the release device are used in combination.

[0072] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A support frame, characterized in that: The cam is connected to the spring via a spring which is fixed to the support member, and the cam is connected to the support member by a spring which is fixed to the support member.

2. The support frame according to claim 1, characterized in that: The fixing portion is a fixing groove convex inwardly toward the central axis of the helical support spring, and the sliding portion is a sliding groove convex inwardly toward the central axis of the helical support spring.

3. The support frame according to claim 1, characterized in that: The elastic reset component is a spiral reset spring sleeved on the sliding rod.

4. The support frame according to claim 3, characterized in that: Both ends of the spiral support spring are provided with fixing rings, and the fixing rod is passed through and fixed on the fixing rings.

5. A stent graft, characterized in that: It comprises a tubular covering and a supporting frame according to any one of claims 1 to 4, wherein the supporting frame is located inside the tubular covering.

6. A vascular treatment assembly, characterized in that: The stent graft according to claim 5 and a release device, wherein the release device comprises a restraining ring, a guide member, and a restraining wire made of a memory alloy; The constraint ring is arranged on the tubular coating of the coated stent, and the constraint ring is located at the end of the tubular coating away from the operator, and the constraint ring is arranged along the circumferential spacing of the tubular coating; the guide member includes a guide head, a constraint seat and a guide wire tube which are arranged in sequence from away to close to the operator, and the guide head and the constraint seat both have a center hole coaxially arranged with the guide wire tube, and the constraint seat is provided with a constraint column for the constraint ring to be sleeved, and the constraint column is provided with a through hole; the constraint wire includes a constraint end and a pulling end for the operator to pull, and the constraint end is bent into a ring shape and passes through the through holes of all the constraint columns in sequence, and the constraint end is located on the moving path of the constraint ring along the outward movement of the constraint column.

7. The vascular treatment assembly according to claim 6, wherein: The restraint ring and the tubular covering are fixed by suturing with soft threads.

8. The vascular treatment assembly according to claim 6, wherein: The through hole is an arc-shaped hole.

9. The vascular treatment assembly according to claim 7, wherein: A guide block is provided on the constraint seat, and the constraint column and the guide block are arranged in sequence along the axial direction of the constraint seat. The guide block is close to the operator, and the guide block corresponds to between two adjacent constraint columns. One of the guide blocks is provided with a guide hole for the pulling end to pass through.

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