Post-release covered stent and post-release system of covered stent

Abstract

The utility model discloses a rear release covered stent and a rear release system of the covered stent. According to the post-release covered stent, a bare stent part in an existing covered stent is omitted, the wave crest of the near-end first-section wave-shaped stent is not sewed with the covering film, and after the near-end first-section wave-shaped stent is compressed, the wave crest can extend out of the edge of the near end of the covering film by a certain distance; and the extended stent part is used as a hanging unit to be matched with the conveyor to finish the post-release of the covered stent. Meanwhile, when the wave crest of the first corrugated stent extends out of the edge of the near end of the covering film, the extending part is small in size, blood flow disturbance is not caused to branch blood vessels, the risk of thrombus formation is greatly reduced, the overall length of the covering film stent can be greatly reduced, and then the pushing stroke of the stent in a conveyor in the implanting process is shortened. Besides, the middle section and the wave trough position of the first section of corrugated stent at the near end are sewn with the covering film, sewing points are sufficient, the stent can be bound by sewing lines even though fatigue fracture occurs, and the risk of scratching blood vessels is reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a post-release coated stent and a post-release system of the coated stent. Background Art

[0002] In the prior art, the thoracic aortic stent graft usually consists of a coated stent and a bare stent without a coating at the proximal end, wherein the bare stent is used to cooperate with a conveyor to complete the post-release of the proximal end of the stent. Although the bare stent is not coated, when the bare stent is implanted at the opening of the branch vessel, it will still cause blood flow disturbance at the opening of the branch vessel, posing the risk of thrombosis.

[0003] In addition, since the bare stent and the covered stent are usually connected at only one end (connected by suturing), once the unsutured end of the bare stent breaks due to fatigue, it will scratch the blood vessel. In addition, the bare stent also increases the overall length of the stent, extending the pushing stroke in the conveyor during the stent implantation process. Utility Model Content

[0004] The purpose of the utility model is to provide a post-release covered stent and a post-release system for the covered stent, so as to solve the problems existing in the above-mentioned existing thoracic aorta covered stent that the bare stent will cause blood flow disturbance at the opening position of the branch blood vessels, the bare stent will extend the overall length of the stent, and the unsutured end of the bare stent is prone to fatigue fracture, thereby scratching the blood vessels.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a post-release coated stent, including a tubular coating, wherein a plurality of sections of wavy stents are arranged at intervals along the axial direction of the outside of the tubular coating, and in the first section of the wavy stent located at the proximal end of the tubular coating, only the middle section and the trough position are connected to the tubular coating, and the peak position of the first section of the wavy stent can extend a certain distance from the proximal edge of the tubular coating after the first section of the wavy stent is circumferentially compressed, and the extended part can be hung on a conveyor used to convey the coated stent as a hanging unit.

[0007] Optionally, the wave crest position of the first section of the corrugated stent can be completely retracted into the proximal edge of the tubular coating after the first section of the corrugated stent is released.

[0008] Optionally, among all the corrugated stents outside the tubular covering, except for the first section of the corrugated stent, the crests, troughs and middle sections of the remaining corrugated stents are connected to the tubular covering.

[0009] Optionally, the middle section and trough of the first section of the wavy stent are sutured and connected to the tubular membrane; among all the wavy stents outside the tubular membrane, the crests, troughs and middle sections of the remaining wavy stents except the first section of the wavy stent are sutured and connected to the tubular membrane.

[0010] The utility model also proposes a post-release system for a coated stent, comprising a conveyor for conveying the coated stent and a post-release coated stent as described in any one of the above items, wherein the peak position of the first section of the wavy stent can extend a certain distance beyond the proximal edge of the tubular coating after the first section of the wavy stent is circumferentially compressed, and the extended portion can be hung on the conveyor as a hanging unit.

[0011] Optionally, the conveyor comprises:

[0012] A guide head, wherein a guide wire hole is provided inside the guide head for the guide wire to pass through;

[0013] A rear-release gripper of the support, wherein a plurality of strip-shaped curved rods arranged along the circumference are arranged at the proximal end of the rear-release gripper of the support, wherein the strip-shaped curved rods are used to hang the hanging unit formed at the wave crest position after the first section of the corrugated support is circumferentially compressed; all the strip-shaped curved rods of the rear-release gripper of the support enclose a plug-in head, and the plug-in head is movably plugged with the distal end of the guide head;

[0014] An intermediate tube connected to the distal end of the rear-release gripper of the stent, the exterior of the intermediate tube being used for sleeve-mounting the rear-release coated stent to be released;

[0015] A distal support tube, slidably sleeved on the outside of the intermediate tube and close to the distal end of the intermediate tube, the distal support tube is used to provide distal support for the post-release coated stent on the intermediate tube;

[0016] A wire guide tube, the proximal end of which passes through the intermediate tube and the bracket and is connected to the distal end of the guide head after the gripper is released in sequence. The wire guide tube is slidably matched with the intermediate tube and the bracket and the gripper is released. A wire guide hole is provided inside the wire guide tube for the guide wire to pass through, and the wire guide hole inside the wire guide tube is connected to the wire guide hole inside the guide head.

[0017] Optionally, the proximal end of the guide head is a pointed cone end with an arc transition.

[0018] Optionally, any of the strip-shaped curved rods are of obtuse-angle broken line type, and the bending part is in a circular arc transition.

[0019] Optionally, the conveyor also includes an outer tube, which is sleeved on the outside of the intermediate tube and the rear-release gripper of the stent, and the proximal end of the outer tube is plugged into the distal end of the guide head; the outer tube is used to circumferentially constrain the rear-release coated stent on the intermediate tube.

[0020] Optionally, the post-release system of the stent graft further includes a guide wire, and the guide wire is used to pass through the guide wire tube and the guide head to guide the conveyor to the aortic lesion site.

[0021] Compared with the prior art, the utility model has achieved the following technical effects:

[0022] The post-release stent graft proposed by the utility model has a novel and reasonable structure. It eliminates the bare stent part in the prior art stent graft, but does not sew the wave crest of the proximal first section of the wavy stent with the graft. After the wave crest of the proximal first section of the wavy stent is compressed, it will extend a certain distance from the proximal edge of the graft. The extended stent part is used as a hanging unit to cooperate with the conveyor to complete the post-release of the stent graft. Compared with the prior art, the stent graft has the following advantages:

[0023] ① The crest of the first proximal section of the wavy stent is not sutured with the membrane. After the first proximal section of the wavy stent is compressed, its crest will extend a certain distance from the proximal edge of the membrane to act as a hanging unit, so that the stent graft can complete the post-release of the stent graft without setting up a special bare stent, which simplifies the overall structure of the stent graft and is conducive to reducing the manufacturing cost of the stent graft.

[0024] ② When the crest of the first proximal section of the corrugated stent extends out from the proximal edge of the coating, the small volume of the extended part can meet the requirements of post-release without causing blood flow disturbance to the branch vessels, thus greatly reducing the risk of thrombosis.

[0025] ③ When the crest of the proximal first section of the wavy stent extends out at the proximal edge of the coating, the volume of the extended part is small. When the stent is not compressed (i.e., after the stent is released), the extended part is completely retracted to within the proximal edge of the tubular coating, which is equivalent to the coated stent having only the coated part. Compared with the existing coated stent with a bare stent, the above two situations can greatly reduce the overall length of the coated stent, thereby shortening the pushing stroke in the conveyor during the stent implantation process, which is beneficial to improving the surgical efficiency.

[0026] ④ Although the crest of the first proximal section of the corrugated stent is not sutured to the membrane, the middle section and the trough are sutured to the membrane, so that the suture points between the first proximal section of the corrugated stent and the membrane are sufficient. Even if the stent suffers from fatigue fracture, it can be restrained by the suture line, reducing the risk of the first proximal section of the corrugated stent scratching the blood vessel.

[0027] The post-release system of the coated stent proposed in the utility model comprises a conveyor and the post-release coated stent, and can realize the post-release of the post-release coated stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic structural diagram of a post-release stent graft disclosed in an embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of the post-release stent graft disclosed in an embodiment of the utility model in a compressed state;

[0031] Figure 3 It is a structural schematic diagram of a conveyor in the rear release system of the stent graft disclosed in an embodiment of the utility model;

[0032] Figure 4 It is a schematic diagram of the assembly of the conveyor and the coated stent in the rear release system of the coated stent disclosed in the embodiment of the utility model.

[0033] Wherein, the accompanying drawings are marked as follows:

[0034] 1. Post-release covered stent; 1-1. Tubular covered stent; 1-2. Corrugated stent; 1-3. First section of corrugated stent; 1-4. Wave trough; 1-5. Middle section; 1-6. Wave peak;

[0035] 2. Conveyor: 2-1. Guide head; 2-2. Release gripper after the support; 2-2-1. Strip curved rod; 2-3. Intermediate tube; 2-4. Distal support tube; 2-5. Guide wire tube; 2-6. Outer tube. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] One of the purposes of the utility model is to provide a post-release covered stent to solve the problems existing in the existing thoracic aorta covered stent that the bare stent will cause blood flow disturbance at the opening position of the branch blood vessels, the bare stent will extend the overall length of the stent, and the unsutured end of the bare stent is prone to fatigue fracture, thereby scratching the blood vessels.

[0038] Another object of the present invention is to provide a post-release system for a coated stent, comprising a conveyor and the post-release coated stent.

[0039] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Embodiment 1

[0041] like Figure 1 to Figure 4 As shown, this embodiment provides a post-release stent graft 1, which is mainly used for the treatment of thoracic aortic lesions. The post-release stent graft 1 includes a tubular coating 1-1, and a plurality of sections of corrugated stents 1-2 are arranged on the outside of the tubular coating 1-1 along its axial intervals, and in the first section of the corrugated stent 1-3 located at the proximal end of the tubular coating 1-1, only the middle section 1-5 and the trough 1-4 are connected to the tubular coating 1-1, and the crest 1-6 of the first section of the corrugated stent 1-3 is not connected to the tubular coating 1-1, but remains separated from the tubular coating 1-1, so that the crest 1-6 of the first section of the corrugated stent 1-3 can extend a certain distance from the proximal edge of the tubular coating 1-1 after the first section of the corrugated stent 1-3 is circumferentially compressed, and the extended portion can be hung on the conveyor used to convey the coated stent as a hanging unit. As shown Figure 2 As shown, it is a schematic diagram of the structure when the wave crest 1-6 of the first section of the wavy stent 1-3 extends out of the proximal edge of the tubular coating 1-1.

[0042] In this embodiment, it is preferred that the wave crest 1-6 of the first section of the corrugated stent 1-3 can be completely retracted to within the proximal edge of the tubular coating 1-1 after the first section of the corrugated stent 1-3 is released, so as to avoid the wave crest 1-6 of the first section of the corrugated stent 1-3 extending beyond the proximal edge of the tubular coating 1-1 after the coated stent is released at the lesion site, thereby causing damage to human blood vessels or other adverse effects. Figure 1 As shown, it is a schematic diagram of the structure when the wave crest 1-6 of the first section of the wavy stent 1-3 is completely retracted into the proximal edge of the tubular coating 1-1.

[0043] In this embodiment, among all the corrugated stents 1-2 outside the tubular covering 1-1, except for the first section of the corrugated stent 1-3, the crests 1-6, troughs 1-4 and middle sections 1-5 of the remaining corrugated stents 1-2 are all connected to the tubular covering 1-1. As a preferred embodiment, among all the corrugated stents 1-2 outside the tubular covering 1-1, the middle section 1-5 and trough 1-4 of the first section of the corrugated stent 1-3 are sutured to the tubular covering 1-1, and except for the first section of the corrugated stent 1-3, the crests 1-6, troughs 1-4 and middle sections 1-5 of the remaining corrugated stents 1-2 are all sutured to the tubular covering 1-1.

[0044] The above-mentioned post-release stent graft 1 eliminates the bare stent part in the prior art stent graft, and instead does not sew the wave crests 1-6 of the proximal first section of the corrugated stent with the graft, and after the proximal first section of the corrugated stent is compressed, the wave crests 1-6 will extend a certain distance from the proximal edge of the graft, and the extended stent part acts as a hanging unit to cooperate with the conveyor to complete the post-release of the stent graft. Compared with the prior art, the stent graft has the following advantages:

[0045] ① The crest of the first proximal section of the corrugated stent is not sutured to the membrane. After the first proximal section of the corrugated stent is compressed, its crest will extend a certain distance from the proximal edge of the membrane to act as a hanging unit, so that the post-release of the coated stent can be completed without setting up a special bare stent.

[0046] ② When the crest of the first proximal section of the corrugated stent extends out from the proximal edge of the coating, the small volume of the extended part can meet the requirements of post-release without causing blood flow disturbance to the branch vessels, thus greatly reducing the risk of thrombosis.

[0047] ③ When the crest of the proximal first section of the wavy stent extends out at the proximal edge of the coating, the volume of the extended part is small. When the stent is not compressed (i.e., after the stent is released), the extended part is completely retracted to within the proximal edge of the tubular coating, which is equivalent to the coated stent having only the coated part. Compared with the existing coated stent with a bare stent, the above two situations can greatly reduce the overall length of the coated stent, thereby shortening the pushing stroke in the conveyor during the stent implantation process, which is beneficial to improving the surgical efficiency.

[0048] ④ Although the crest of the first proximal section of the corrugated stent is not sutured to the membrane, the middle section and the trough are sutured to the membrane, so that the suture points between the first proximal section of the corrugated stent and the membrane are sufficient. Even if the stent suffers from fatigue fracture, it can be restrained by the suture line, reducing the risk of the first proximal section of the corrugated stent scratching the blood vessel.

[0049] Embodiment 2

[0050] like Figure 3 and Figure 4As shown, this embodiment proposes a post-release system for a coated stent, including a conveyor 2 for conveying the coated stent and a post-release coated stent 1 as disclosed in the first embodiment, the position of the crest 1-6 of the first section of the wavy stent 1-3 can extend a certain distance from the proximal edge of the tubular coating 1-1 after the first section of the wavy stent 1-3 is circumferentially compressed, and the extended portion can be hung on the conveyor 2 as a hanging unit. In this embodiment, the conveyor 2 includes a guide head 2-1, a rear-release gripper 2-2, an intermediate tube 2-3, a distal support tube 2-4 and a guide wire tube 2-5. A guide wire hole is provided inside the guide head 2-1 for the guide wire to pass through; a plurality of strip-shaped curved rods 2-2-1 arranged along the circumference are provided at the proximal end of the rear-release gripper 2-2 of the stent, and the strip-shaped curved rods 2-2-1 are used to hang the first section of the corrugated stent 1-3 after circumferential compression, and the wave crest 1-6 position forms a hanging unit; all the strip-shaped curved rods 2-2-1 of the rear-release gripper 2-2 of the stent are enclosed to form an insertion head, and the insertion head is movably plugged with the distal end of the guide head 2-1; the intermediate tube 2-3 is connected to the rear-release gripper 2-2 of the stent The distal end of the intermediate tube 2-3 is used to cover the rear-release coated stent 1 to be released; the distal support tube 2-4 is slidably covered on the outside of the intermediate tube 2-3 and close to the distal end of the intermediate tube 2-3, and the distal support tube 2-4 is used to provide distal support for the rear-release coated stent 1 on the intermediate tube 2-3; the proximal end of the guide wire tube 2-5 successively passes through the intermediate tube 2-3 and the rear-release gripper 2-2 of the stent and is connected to the distal end of the guide head 2-1, the guide wire tube 2-5 is slidably matched with the intermediate tube 2-3 and the rear-release gripper 2-2 of the stent, and a guide wire hole for the guide wire to pass through is opened inside the guide wire tube 2-5, and the guide wire hole inside the guide wire tube 2-5 is connected to the guide wire hole inside the guide head 2-1.

[0051] In this embodiment, Figure 3 As shown, in order to prevent the guide head 2-1 from damaging human tissue, the proximal end of the guide head 2-1 is preferably set to a sharp cone structure with an arc transition, and the proximal end of the guide head 2-1 is generally in the shape of a bullet head. Correspondingly, the distal end of the guide head 2-1 is preferably set to a cylindrical shape, which is convenient for insertion into the insertion head formed by the strip-shaped curved rod 2-2-1.

[0052] In this embodiment, any of the curved bars 2-2-1 is of an obtuse-angled broken line type, and the bending part thereof is in a circular arc transition.

[0053] In this embodiment, it is preferred that a plurality of strip-shaped curved rods 2-2-1 are evenly arranged, for example, 4 or 6 strip-shaped curved rods 2-2-1 are evenly spaced along the circumferential direction of the rear release gripper 2-2 of the bracket. Generally, the number of the strip-shaped curved rods 2-2-1 is not less than the number of the wave crests 1-6 of the first section of the corrugated bracket 1-3, and generally the number and position of the strip-shaped curved rods 2-2-1 are arranged in one-to-one correspondence with the wave crests 1-6 of the first section of the corrugated bracket 1-3.

[0054] In this embodiment, the conveyor 2 also includes an outer tube 2-6, which is mounted on the outside of the intermediate tube 2-3 and the rear-release gripper 2-2 of the stent, and the proximal end of the outer tube 2-6 is plugged into the distal end of the guide head 2-1; the outer tube 2-6 is used to circumferentially constrain the rear-release coated stent 1 on the intermediate tube 2-3.

[0055] In this embodiment, the post-release system of the stent graft also includes a guide wire, which is used to pass through the guide wire tube 2-5 and the guide wire hole of the guide head 2-1 to guide the conveyor 2 to the aortic lesion site.

[0056] In this embodiment, the distal end of the guide wire tube 2-5 may also be configured with a handle structure to facilitate the operator to hold it during the operation.

[0057] In this embodiment, the wire guide tube 2-5 is preferably integrally formed with the guide head 2-1, and the strip-shaped bent rod 2-2-1, the rear release gripper 2-2 of the bracket and the intermediate tube 2-3 are preferably integrally formed.

[0058] like Figure 3 and Figure 4 As shown, the compressed rear-release coated stent 1 is sleeved on the outside of the intermediate tube 2-3 and gathered in the outer tube 2-6. At this time, the wave crest 1-6 of the first section of the corrugated stent 1-3 extends a certain distance from the proximal edge of the tubular coating 1-1, and forms a hanging unit to be hung on each strip-shaped curved rod 2-2-1. The guide wire tube 2-5 is slidably inserted into the rear-release gripper 2-2 and the intermediate tube 2-3 of the stent, and ensures that the distal end of the guide wire tube 2-5 extends to the outside of the distal end of the intermediate tube 2-3. The distal end of the guide head 2-1 is plugged into the plug-in head formed by the strip-shaped curved rod 2-2-1. Under the limiting action of the guide head 2-1, the first section of the corrugated stent 1-3 is restrained on the rear-release gripper 2-2 of the stent. At the same time, the outer tube 2-6 is sleeved on the outside of the distal end of the guide head 2-1, and can circumferentially cover the strip curved rod 2-2-1 to ensure that the strip curved rod 2-2-1 holds the distal end of the guide head 2-1 tightly, preventing the wave crest of the first section of the wavy bracket 1-3 from slipping off the strip curved rod 2-2-1.

[0059] During the specific operation, the guide wire is passed through the guide head 2-1 and the guide wire hole in the guide wire tube 2-5, and the conveyor 2 is pushed forward along the guide wire to the aortic lesion site; then the distal support tube 2-4, the intermediate tube 2-3 and the guide wire tube 2-5 are fixed, and the outer tube 2-6 is withdrawn to expose the rear-release coated stent 1; then it is confirmed whether the implantation position of the rear-release coated stent 1 is accurate. After the position is confirmed, the guide wire tube 2-5 is fixed, and the intermediate tube 2-3 is withdrawn to make the strip curved rod 2-2-1 slide off from the wave crest of the first section of the wavy stent 1-3, and completely shrink into the rear-release coated stent 1, thereby completely releasing the rear-release coated stent 1.

[0060] In the post-release system of the above-mentioned stent graft, the structure of the conveyor is novel and reasonable, and the release of the post-release stent graft 1 can be achieved through ingenious structural design. The operation is simple and quick, which is conducive to improving work efficiency.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A post-release covered stent, It is characterized in that It includes a tubular coating, and a plurality of wavy stents are arranged at intervals along the axial direction of the outside of the tubular coating, and in the first wavy stent located at the proximal end of the tubular coating, only the middle section and the trough position are connected to the tubular coating, and the peak position of the first wavy stent can extend a certain distance from the proximal edge of the tubular coating after the first wavy stent is circumferentially compressed, and the extended part can be hung on a conveyor used to transport the coated stent as a hanging unit.

2. The post-release stent graft according to claim 1, It is characterized in that The wave crest position of the first section of the corrugated stent can be completely retracted into the proximal edge of the tubular coating after the first section of the corrugated stent is released.

3. The post-release stent graft according to claim 1 or 2, It is characterized in that Among all the corrugated stents outside the tubular covering, except the first section of the corrugated stent, the crests, troughs and middle sections of the remaining corrugated stents are connected to the tubular covering.

4. The post-release stent graft according to claim 3, It is characterized in that The middle section and trough of the first section of the wavy stent are sutured and connected to the tubular membrane; among all the wavy stents outside the tubular membrane, the crests, troughs and middle sections of the remaining wavy stents except the first section of the wavy stent are sutured and connected to the tubular membrane.

5. A post-release system for a stent graft, It is characterized in that It comprises a conveyor for conveying a coated stent and a post-release coated stent as described in any one of claims 1 to 4, wherein the peak position of the first section of the wavy stent can extend a certain distance beyond the proximal edge of the tubular coating after the first section of the wavy stent is circumferentially compressed, and the extended portion can be hung on the conveyor as a hanging unit.

6. The post-release system of the stent graft according to claim 5, It is characterized in that The conveyor comprises: A guide head, wherein a guide wire hole is provided inside the guide head for the guide wire to pass through; A rear-release gripper of the support, wherein a plurality of strip-shaped curved rods arranged along the circumference are arranged at the proximal end of the rear-release gripper of the support, wherein the strip-shaped curved rods are used to hang the hanging unit formed at the wave crest position after the first section of the corrugated support is circumferentially compressed; all the strip-shaped curved rods of the rear-release gripper of the support enclose a plug-in head, and the plug-in head is movably plugged with the distal end of the guide head; An intermediate tube connected to the distal end of the rear-release gripper of the stent, the exterior of the intermediate tube being used for sleeve-mounting the rear-release coated stent to be released; A distal support tube, slidably sleeved on the outside of the intermediate tube and close to the distal end of the intermediate tube, the distal support tube is used to provide distal support for the post-release coated stent on the intermediate tube; A wire guide tube, the proximal end of which passes through the intermediate tube and the bracket and is connected to the distal end of the guide head after the gripper is released in sequence. The wire guide tube is slidably matched with the intermediate tube and the bracket and the gripper is released. A wire guide hole is provided inside the wire guide tube for the guide wire to pass through, and the wire guide hole inside the wire guide tube is connected to the wire guide hole inside the guide head.

7. The post-release system of the stent graft according to claim 6, It is characterized in that The proximal end of the guide head is a sharp cone end with an arc transition.

8. The post-release system of the stent graft according to claim 6, It is characterized in that Any of the strip-shaped curved rods is of an obtuse-angled broken line type, and the bending portion thereof is in an arc transition.

9. The post-release system of the stent graft according to any one of claims 6 to 8, It is characterized in that The conveyor also includes an outer tube, which is sleeved on the outside of the intermediate tube and the rear-release gripper of the stent, and the proximal end of the outer tube is plugged into the distal end of the guide head; the outer tube is used to circumferentially constrain the rear-release coated stent on the intermediate tube.

10. The post-release system of the stent graft according to any one of claims 6 to 8, It is characterized in that It also includes a guide wire, which is used to pass through the guide wire tube and the guide head to guide the conveyor to the aortic lesion site.

Images