Functional aortic arch in situ fenestration dedicated covered stent

Abstract

The present invention relates to the field of medical device technology, and discloses a functional aortic arch in situ fenestration special covered stent, the proximal end of the aortic covered stent is provided with 2-3 Z-shaped wave stent rings (proximal Z-shaped wave stent ring group), the distal end is provided with 3-4 Z-shaped wave stent rings (distal Z-shaped wave stent ring group), the middle section of the aortic covered stent is provided with a saddle-shaped metal stent ring, the aortic stent is fully covered with a coating, the coating is provided with a mesh-like reinforcing wire, the outer peripheral side of the coating of the first Z-shaped wave stent ring of the proximal Z-shaped wave stent ring group is wrapped with a sponge-like structure, and the inside of the mesh reinforcing wire is provided with mutually cooperating latitudes and warps. The present invention mainly provides a special covered stent for in situ fenestration for in situ fenestration technology, which improves the success rate of fenestration, reduces the probability of stenosis caused by compression of the branch stent by the angle of the metal ring, reduces the damage of the proximal end of the stent to the aortic wall, and reduces the risk of recurrent dissection at the proximal end.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a functional aortic arch in situ fenestration-specific covered stent. Background Art

[0002] At present, endovascular technology has been applied to the treatment of aortic arch diseases, among which the most critical is the reconstruction of the branch vessels above the arch. The current technologies mainly include pre-fenestration technology, chimney technology, branch stent technology and in situ fenestration technology, each with its own advantages and disadvantages. Due to the following problems, in situ fenestration technology is currently the more ideal method:

[0003] Pre-windowing technology is to modify the commercial finished stent on the spot, that is, trim the film to form a window. This process will damage the normal structure of the stent, making it difficult to ensure the long-term stability of the stent. In addition, during the operation, the window position needs to be aligned with the branch artery opening in the circumferential and axial directions, but accurate alignment is difficult and it is easy to cover the branch opening on the arch, causing serious complications. This method is difficult to operate and difficult to promote and implement;

[0004] The chimney technique is to release the branch stent graft through the guidewire reserved in the branch artery after releasing the main stent graft in the aortic arch. The front half of the branch stent graft needs to be placed in parallel with the main stent graft, and the rear half is located in the branch artery. Because the main stent graft and the branch stent graft squeeze each other in the tube wall and cannot fit tightly, this method leads to a higher risk of endoleak (blood flow continues to flow into the diseased area along the gap between the main stent graft and the branch stent graft), aortic wall damage and branch stent graft occlusion;

[0005] Branched stent technology, this technology is that the main stent itself is designed with branches, which can reconstruct branch arteries at the same time. However, the existing single-branch stent is difficult to adapt to the reconstruction of 2 or 3 supra-arch branch vessels; the existing double-branch stent can simultaneously reconstruct the brachiocephalic artery and the left common carotid artery, but cannot directly reconstruct the left subclavian artery, and hybrid surgery is required to reconstruct the left subclavian artery, which is still relatively traumatic; there are currently no commercially available 3-branch stents, and the finished 3-branch is difficult to adapt to different vascular anatomy, and customized 3-branch requires a long wait; there are also research reports showing that the incidence of cerebral stroke is higher with branched stent technology;

[0006] Therefore, the above technologies are difficult to provide suitable tools for the clinical intravascular treatment of aortic arch diseases. The in situ fenestration technology uses the existing commercial thoracic aortic covered stent. Through the fenestration instrument (puncture catheter, radiofrequency catheter or laser catheter), a window is opened on the aortic stent in reverse from the patient's branch vessel access to reconstruct the supra-arch branch vessels. 1-3 supra-arch branch vessels can be reconstructed intracavitary as needed without changing the original anatomy. There is no need for precise alignment when releasing the main stent. The use of existing commercial stents does not require customization time and is easy to promote.

[0007] The prior art has the following defects and deficiencies:

[0008] However, existing stents used in in situ fenestration technology often cannot control the position of the metal frame relative to the branch opening. Windowing is often difficult because the head end of the fenestration instrument is located on the Z-shaped wave metal frame, or is located at the angle of the metal ring, resulting in limited window size. After the branch stent is released, it is compressed by the angle, causing local stenosis of the branch stent.

[0009] In addition, the above technologies, including the existing in situ fenestration technology, use stents designed for descending aortic lesions, and the proximal end of the stent often needs to be placed in the ascending aorta or Z0 area when reconstructing the supra-aortic branch. The incidence of ascending aortic dissection after implantation of existing stents remains high. The main reason is that the design of the stent head is not reasonable enough, resulting in local stress concentration on the ascending aorta wall. The patient's ascending aorta wall is weak and the pulsation amplitude of the ascending aorta is large, which makes the stent head easy to damage the wall. Therefore, the existing aortic stent grafts are difficult to meet the needs of endovascular treatment of aortic arch diseases. Summary of the invention

[0010] In view of the deficiencies in the prior art, the present invention provides a functional aortic arch in situ fenestration-specific covered stent, which can solve the problem that when the prior stent is used, the head end of the fenestration instrument is often located on the Z-shaped wave metal skeleton, resulting in difficulty in fenestration, and the fenestration position is located at the angle of the metal ring, resulting in limited fenestration size and then the branch stent is compressed by the angle after release, resulting in local stenosis of the branch stent; the present invention mainly provides an aortic covered stent for in situ fenestration technology to improve the success rate of fenestration, reduce the probability of stenosis of the branch stent due to compression by the angle of the metal stent, reduce the damage of the proximal end of the stent to the aortic wall, and reduce the risk of proximal recurrent dissection.

[0011] In order to achieve the above-mentioned purpose of improving the success rate of fenestration with a special covered stent for in situ fenestration of a functional aortic arch, reducing the probability of stenosis caused by compression of the branch stent by the angle of the metal stent, reducing the damage of the proximal end of the stent to the aortic wall and reducing the probability of recurrent dissection at the proximal end, the present invention provides the following technical solutions: a special covered stent for in situ fenestration of a functional aortic arch, comprising an aortic covered stent, which can be used in combination with a branch stent, one end of the aortic covered stent is set as the proximal end, and the other end of the aortic covered stent is set as the distal end, a proximal Z-shaped wave stent ring group is arranged on the proximal end, the outer peripheral side of the covered film of the first Z-shaped wave stent ring of the proximal Z-shaped wave stent ring group is wrapped with a sponge-like structure, a distal Z-shaped wave stent ring group is arranged on the distal end, a saddle-shaped metal stent ring group is arranged in the middle section of the aortic covered stent, the aortic covered stent is covered with a film throughout, a mesh reinforcing wire is arranged on the surface of the film, and the mesh reinforcing wire is arranged with mutually matching latitude and warp.

[0012] Preferably, the aortic stent graft has an overall length of 80-200 mm, has no reinforcing ribs, and is fully covered with a coating, wherein the most proximal (first) Z-wave stent ring of the proximal Z-wave stent ring group is exposed for 0-50% of its length.

[0013] Preferably, the number of Z-wave support rings of the proximal Z-wave support ring group is 2-3, the spacing between the Z-wave support rings of the proximal Z-wave support ring group is 1mm-20mm, the nearest Z-wave support ring of the proximal Z-wave support ring group is a Z-wave support ring with low amplitude and multiple waves, the nearest Z-wave support ring of the proximal Z-wave support ring group is 1mm-15mm away from the second Z-wave support ring, the surface of the nearest Z-wave support ring of the proximal Z-wave support ring group is coated to cover 50%-100% of the height, the amplitude of the proximal Z-wave support ring is 5-20mm, and the metal wire diameter of the proximal Z-wave support ring is 0.3-1.0mm.

[0014] Preferably, the length of the sponge-like structure is 5mm-20mm, the sponge-like structure wraps the outer periphery of the most proximal Z-wave stent ring membrane of the proximal Z-wave stent ring group, the material of the sponge-like structure is medical polyurethane, the thickness of the sponge-like structure is 0.5-2mm, and the sponge-like structure can be greatly compressed and can restore its original thickness after release.

[0015] Preferably, the number of the distal Z-wave support ring groups is 3-4, the distal Z-wave support ring groups are all covered with a film, the spacing between the Z-wave support rings of the distal Z-wave support ring group is 1mm-20mm, the amplitude of the Z-wave support rings of the distal Z-wave support ring group is 5-20mm, and the diameter of the metal wire of the distal Z-wave support ring group is 0.3-1.0mm.

[0016] Preferably, the number of the saddle-shaped metal bracket rings is 3-10, the spacing between the saddle-shaped metal bracket rings is 5mm-20mm, the overall length of the saddle-shaped metal bracket ring is 50mm-120mm, the amplitude of the saddle-shaped bracket ring is 5-20mm, the diameter of the metal wire is 0.3-1.0mm, and the saddle-shaped bracket ring group is fully covered with a film.

[0017] Preferably, the coating material is eptfe, i.e. expanded polytetrafluoroethylene film, the coating thickness is 0.2-1.0mm, the mesh reinforcement wire material is eptfe with higher strength, and the mesh size of the mesh reinforcement wire is 5*5-10*10mm.

[0018] Compared with the prior art, the present invention provides a functional aortic arch in situ fenestration-specific covered stent, which has the following beneficial effects:

[0019] 1. This is a functional aortic arch in situ fenestration-specific covered stent. The overall length of the aortic covered stent is 80-200mm, without reinforcing ribs, to reduce the straightening force;

[0020] 2. This is a functional aortic arch in situ window special covered stent. The proximal end of the aortic covered stent is provided with a proximal Z-wave stent ring group to increase the sealing performance of the stent. The most proximal Z-wave stent ring of the proximal Z-wave stent ring group is a Z-wave stent ring with low amplitude and multiple waves. The covering film covers 50%-100% of the height, which can reduce the stress concentration and damage of the proximal stent ring to the tube wall and enhance the sealing effect of the stent. The distal end is provided with a distal Z-wave stent ring group, which is fully covered with a covering film to enhance the distal sealing effect and prevent distal end leakage.

[0021] 3. This is a functional aortic arch in situ fenestration special covered stent. The proximal covered part is designed with a 5mm-20mm long sponge-like structure that wraps around the stent. The sponge-like structure is made of medical polyurethane with a thickness of 0.5-2mm. It can be greatly compressed and can be restored to its original thickness after release. The sponge-like structure will increase the contact area between the stent and the aortic wall to reduce stress concentration, buffer the relative movement between the stent metal frame and the wall stent, and further reduce the risk of proximal recurrent dissection. At the same time, this structure is conducive to further strengthening the sealing effect;

[0022] 4. This is a functional aortic arch in situ fenestration-specific covered stent. The stent design is to reduce the influence of the metal skeleton of the fenestration section on the fenestration. 3-5 saddle-shaped metal stent rings are designed in the middle section of the aortic covered stent, which can minimize the probability of metal wire blocking the fenestration device. The angle of the saddle-shaped metal stent ring without limiting the balloon expansion window can not only help to form a better-shaped window but also prevent the stent from being compressed by the angle to cause local stenosis. At the same time, the saddle-shaped metal stent ring has a certain radial support force to prevent the stent from collapsing. The spacing between the saddle-shaped metal stent rings is 5mm-20mm, which can provide sufficient flexibility for the stent and provide more metal-free area for the fenestration.

[0023] 5. This is a special covered stent for in situ window opening of functional aortic arch. The coating is made of eptfe, i.e. expanded polytetrafluoroethylene film, which is formed by overlapping hot pressing. The coating thickness is 0.2-1.0mm. The coating is designed with mesh reinforcement wire, which can effectively prevent the unlimited tearing of the coated window and the extension of the rupture caused by balloon expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention from one angle;

[0025] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle;

[0026] Figure 3 It is a schematic diagram of the coating structure of the present invention.

[0027] In the figure: 1. aortic covered stent; 2. branch stent; 3. proximal end; 4. distal end; 5. proximal Z-wave stent ring group; 6. sponge-like structure; 7. distal Z-wave stent ring group; 8. saddle-shaped metal stent ring; 9. covering; 10. mesh reinforcing wire; 11. weft; 12. warp. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-3 A functional aortic arch in situ fenestration special covered stent, comprising an aortic covered stent 1, which can be used in combination with a branch stent 2, one end of the aortic covered stent 1 is set as a proximal end 3, and the other end of the aortic covered stent 1 is set as a distal end 4, a proximal Z-shaped wave stent ring group 5 is arranged on the proximal end 3, the outer peripheral side of the covered membrane of the first Z-shaped wave stent ring of the proximal Z-shaped wave stent ring group 5 is wrapped with a sponge-like structure 6, a distal Z-shaped wave stent ring group 7 is arranged on the distal end 4, a saddle-shaped metal stent ring group 8 is arranged in the middle section of the aortic covered stent 1, the aortic covered stent 1 is fully covered with a covering 9, a mesh reinforcing wire 10 is arranged on the surface of the covering 9, and the mesh reinforcing wire 10 is arranged with mutually matching latitudes 11 and warps 12 inside.

[0030] In summary, the overall length of the aortic covered stent 1 is 80-200mm, without reinforcement ribs, the aortic covered stent 1 is covered with a coating 9 throughout, wherein the most proximal Z-wave stent ring of the proximal Z-wave stent ring group 5 is exposed 0-50% of the length, and the aortic covered stent 1 has no reinforcement ribs to reduce the straightening force; the number of Z-wave stent rings of the proximal Z-wave stent ring group 5 is 3-4, the spacing between the Z-wave stent rings of the proximal Z-wave stent ring group 5 is 1mm-20mm, the most proximal Z-wave stent ring of the proximal Z-wave stent ring group 5 is a Z-wave stent ring with low amplitude and multiple wave numbers of 8-16, the most proximal Z-wave stent ring of the proximal Z-wave stent ring group 5 is 1mm-15mm away from the second Z-wave stent ring, and the proximal Z-wave stent ring is 20mm away from the proximal Z-wave stent ring. The surface coating 9 of the most proximal Z-wave stent ring of the proximal Z-wave stent ring group 5 covers 50%-100% of the height, thereby increasing the sealing performance of the stent. The most proximal Z-wave stent ring of the proximal Z-wave stent ring group 5 is a Z-wave stent ring with low amplitude and multiple wave numbers, and the coating covers 50%-100% of the height, thereby reducing the stress concentration and damage of the proximal stent ring to the tube wall, and also enhancing the sealing effect of the stent. The sponge-like structure 6 is 5mm-20mm in length, and the sponge-like structure 6 wraps the outer periphery of the most proximal Z-wave stent ring of the proximal Z-wave stent ring group 5. The material of the sponge-like structure 6 is medical polyurethane or other inert medical polymer materials, and the thickness of the sponge-like structure 6 is 0.5-2mm. The sponge-like structure 6 can be greatly compressed by more than 50%, and after being released The original thickness can be restored, and the sponge-like structure 6 will increase the contact area between the stent and the aortic wall to reduce stress concentration, buffer the relative movement between the stent metal frame and the wall stent, and further reduce the risk of proximal recurrent dissection; the number of Z-wave stent rings in the distal Z-wave stent ring group 7 is 3-4, and the distal Z-wave stent ring group 7 is fully covered with a film. The spacing between the Z-wave stent rings in the distal Z-wave stent ring group 7 is 1mm-20mm, and the wave amplitude of the Z-wave stent ring in the distal Z-wave stent ring group 7 is 5-20mm. The diameter of the metal wire of the distal Z-wave stent ring group 7 is 0.3-1.0mm, and it is fully covered with a film, which strengthens the distal sealing effect and prevents distal internal leakage; the number of saddle-shaped metal stent rings 8 is 3-10 The spacing between the saddle-shaped metal stent rings 8 is 5mm-20mm, and the overall length of the saddle-shaped metal stent rings 8 is 50mm-120mm, which can minimize the probability of metal wire blocking the window opening device. The angle of the window without limiting the balloon expansion window on the saddle-shaped metal stent ring 8 can not only help to form a better window shape, but also prevent the stent from being compressed by the angle and causing local stenosis. At the same time, the saddle-shaped metal stent ring 8 has a certain radial support force to prevent the stent from collapsing. The saddle-shaped metal stent ring 8 has a wide distance design of 5mm-20mm spacing, which can provide sufficient flexibility for the stent and provide more metal-free area for window opening; the coating 9 is made of eptfe, that is, expanded polytetrafluoroethylene film, and the thickness of the coating 9 is 0.2-1.0mm, the mesh reinforcement wire 10 is made of stronger eptfe, the mesh size of the mesh reinforcement wire 10 is 5*5-10*10mm, the coating 9 is made of eptfe, that is, expanded polytetrafluoroethylene film, overlapped hot pressing, the thickness of the coating 9 is 0.2-1.0mm, the coating is designed with the warp and weft of the mesh reinforcement wire 10, which is a stronger eptfe line, which can effectively prevent the unlimited tearing of the coating window caused by balloon expansion and the extension of the rupture. .

[0031] The working process and installation method of the present invention are as follows: when the functional aortic arch in situ window-opening special covered stent is used for intracavitary treatment of aortic arch diseases and reconstruction of the three-branch arteries on the arch is required, first establish temporary extracorporeal circulation via the axillary femoral artery bypass. The stent of the present invention is compressed and entered into the conveyor, introduced into the conveyor through the femoral artery and delivered to the aortic arch. The head end of the conveyor enters the ascending aorta, and the conveyor is controlled to release the stent of the present invention. After the stent is completely released, the proximal Z-shaped wave stent ring group of the stent is located in the ascending aorta and the proximal end of the opening of the brachiocephalic artery, the middle saddle-shaped stent ring group is located in the aortic arch, and the distal Z-shaped wave stent ring group is located in the descending aorta and the distal end of the opening of the left subclavian artery. At this time, the temporary extracorporeal circulation is turned on. Further, a fenestration instrument is introduced through the right carotid artery to the opening of the brachiocephalic trunk, a "window" is made on the membrane of the aortic stent graft, and a small stent is implanted; similarly, a fenestration instrument is introduced through the left carotid artery to the opening of the left common carotid artery, a "window" is made on the membrane of the aortic stent graft, and a small stent is implanted; similarly, a fenestration instrument is introduced through the left brachial artery to the opening of the left subclavian artery, a "window" is made on the membrane of the aortic stent graft, and a small stent is implanted; in this way, the special stent of the present invention is used to complete the intracavitary treatment of the aortic arch through the in situ fenestration technology, while maintaining the blood supply of the three branch arteries on the arch;

[0032] The present invention discloses a functional aortic arch in situ window-opening special covered stent, which has an overall length of 80-200mm and no reinforcing ribs by setting the aortic covered stent 1, and reduces the straightening force; the proximal end 3 of the aortic covered stent 1 is provided with a proximal Z-shaped wave stent ring group 5, which increases the sealing performance of the stent; the proximal end of the proximal Z-shaped wave stent ring group 5 is a Z-shaped wave stent ring with low amplitude and multiple waves, and the covering covers 50%-100% of the height, which can reduce the stress concentration and damage of the proximal stent ring to the tube wall, and can also enhance the sealing effect of the stent; the distal end 4 is a distal Z-shaped wave stent ring group 7 structure , all covered with film, which strengthens the distal sealing effect and prevents distal internal leakage; the proximal 3 coating part is designed with a 5mm-20mm long sponge-like structure 6 that wraps around the stent. The sponge-like structure 6 is made of medical polyurethane or other inert medical polymer materials with a thickness of 0.5-2mm. It can be greatly compressed by more than 50% and can restore its original thickness after release. The sponge-like structure 6 will increase the contact area between the stent and the aortic wall to reduce stress concentration, buffer the relative movement between the metal frame of the stent and the wall stent, and further reduce the risk of proximal recurrent dissection. At the same time, this structure is conducive to further strengthening the sealing effect; in order to reduce the influence of the metal skeleton of the fenestration section on the fenestration, the metal wire blocks the fenestration device or the metal angle limits the expansion of the window, 3-5 saddle-shaped metal stent rings 8 are designed in the middle section of the aortic covered stent 1, which can minimize the probability of the metal wire blocking the fenestration device. The saddle-shaped metal stent ring 8 has no angle that limits the balloon expansion window, which can be conducive to forming a better shape of the window and prevent the stent from being compressed by the angle to cause local stenosis. The stent ring 8 has a certain radial supporting force to prevent the stent from collapsing. The saddle-shaped metal stent ring 8 is designed with a wide distance of 5mm-20mm, which can provide sufficient flexibility for the stent and provide more metal-free area for window opening; the coating 9 is made of eptfe material, that is, expanded polytetrafluoroethylene film, which is overlapped and hot-pressed. The thickness of the coating 9 is 0.2-1.0mm. The coating is designed with mesh reinforcement wires 10 warp and weft lines, which are stronger eptfe lines, which can effectively prevent the unlimited tearing of the coating window caused by balloon expansion and the extension of the rupture.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A functional aortic arch in situ fenestration-specific covered stent, characterized in that: The invention comprises an aortic stent graft (1), wherein the aortic stent graft (1) can be used in combination with a branch stent (2), wherein one end of the aortic stent graft (1) is set as a proximal end (3), and the other end of the aortic stent graft (1) is set as a distal end (4), wherein a proximal Z-shaped wave stent ring group (5) is set on the proximal end (3), and the outer peripheral side of the coating of the first Z-shaped wave stent ring of the proximal Z-shaped wave stent ring group (5) is wrapped with a sponge-like structure (6), and the distal end (4) is set with a distal Z-shaped The aortic stent graft (1) is provided with a saddle-shaped metal stent ring group (8) in the middle section, the metal wire diameter of the saddle-shaped metal stent ring group (8) is 0.3-1.0 mm, the saddle-shaped metal stent rings in the saddle-shaped metal stent ring group (8) have no angle that limits the balloon expansion window, the aortic stent graft (1) is fully covered with a coating (9), the coating (9) is made of eptfe, and the surface of the coating (9) is provided with a mesh reinforcement wire (1 0), the mesh reinforcing wire (10) is made of eptfe with higher strength, and the mesh reinforcing wire (10) is provided with mutually matching wefts (11) and warps (12) inside; the number of Z-shaped wave support rings of the proximal Z-shaped wave support ring group (5) is 2-3, the spacing between the Z-shaped wave support rings of the proximal Z-shaped wave support ring group (5) is 1mm-20mm, the most proximal Z-shaped wave support ring of the proximal Z-shaped wave support ring group (5) is a Z-shaped wave support ring with low amplitude and multiple wave numbers, The most proximal Z-shaped wave stent ring of the proximal Z-shaped wave stent ring group (5) is spaced 1mm-15mm from the second Z-shaped wave stent ring; the number of saddle-shaped metal stent rings of the saddle-shaped metal stent ring group (8) is 3-10, the spacing between every two adjacent saddle-shaped metal stent rings is 5mm-20mm, the overall section length of the saddle-shaped metal stent ring group (8) is 50mm-120mm, the saddle-shaped metal stent ring amplitude is 5-20mm, and the saddle-shaped metal stent ring group is completely covered with a film.

2. A functional aortic arch in situ fenestration-specific covered stent according to claim 1, characterized in that: The aortic stent graft (1) has an overall length of 80-200 mm and has no reinforcing ribs. The aortic stent graft (1) is fully covered with a coating (9), wherein the proximal Z-shaped wave stent ring of the proximal Z-shaped wave stent ring group (5) has 0-50% of its proximal Z-shaped wave stent ring exposed.

3. The functional aortic arch in situ fenestration dedicated covered stent according to claim 1, characterized in that: The proximal Z-shaped wave support ring of the proximal Z-shaped wave support ring group (5) has a surface coating (9) covering 50%-100% of its height, a wave amplitude of the proximal Z-shaped wave support ring of 5-20 mm, and a metal wire diameter of the proximal Z-shaped wave support ring of 0.3-1.0 mm.

4. The functional aortic arch in situ fenestration-specific covered stent according to claim 1, characterized in that: The sponge-like structure (6) has a length of 5 mm to 20 mm. The sponge-like structure (6) wraps around the outer periphery of the most proximal Z-shaped wave stent ring membrane of the proximal Z-shaped wave stent ring group (5). The material of the sponge-like structure (6) is medical polyurethane or other inert medical polymer materials. The thickness of the sponge-like structure (6) is 0.5 to 2 mm. The sponge-like structure (6) can be greatly compressed by more than 50% and can restore its original thickness after release.

5. The functional aortic arch in situ fenestration dedicated covered stent according to claim 1, characterized in that: The number of the distal Z-shaped wave support ring group (7) is 3-4, the distal Z-shaped wave support ring group (7) is completely covered with a film, the spacing between the Z-shaped wave support rings of the distal Z-shaped wave support ring group (7) is 1mm-20mm, the amplitude of the Z-shaped wave support ring of the distal Z-shaped wave support ring group (7) is 5-20mm, and the diameter of the metal wire of the distal Z-shaped wave support ring group (7) is 0.3-1.0mm.

6. The functional aortic arch in situ fenestration dedicated covered stent according to claim 1, characterized in that: The coating (9) has a thickness of 0.2-1.0 mm, and the mesh size of the mesh reinforcing wire (10) is 5*5-10*10 mm.

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