Aortic branch stent graft system and device for reconstructing left common carotid artery

Abstract

The invention discloses an aorta branch stent graft system and device for reconstructing a left common carotid artery, and relates to the technical field of medical instruments, a main stent of the aorta branch stent graft system for reconstructing the left common carotid artery is of a hollow covered stent structure and is used for treating a lesion site of an aorta disease; one end of the branch stent is connected with the side wall of the main stent, and the branch stent is used for reconstructing the left common carotid artery; the net-shaped window structure is arranged at the telecentric end, close to the starting part of the branch stent, of the side wall of the main stent, corresponds to the position of the left subclavian artery and is used for subsequent operation of reconstructing the left subclavian artery. An aorta disease lesion part can be repaired through a total femoral artery approach, the near-end anchoring area is moved forwards to the left common carotid artery, and the left common carotid artery and the left subclavian artery are subjected to intracavitary reconstruction which completely conforms to a physiological anatomical structure and is along the blood flow direction by being combined with the integrated single branch stent in a telescopic mode.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an aortic branch stent graft system and device for reconstructing the left common carotid artery. Background Technology

[0002] Due to the unique structure of the aortic arch, it has long been considered a "no-go zone" for endovascular treatment. When a patient's lesion involves the aortic arch, traditional open surgery or hybrid surgery is usually performed, but these procedures are highly invasive, time-consuming, and have a high rate of perioperative complications.

[0003] In recent years, with the development of minimally invasive aortic interventional techniques, numerous endovascular treatment techniques and products for aortic arch lesions have emerged. Among them, parallel stents and fenestration techniques are the most widely used, but problems such as obstruction of normal blood flow in the aortic arch and postoperative endoleak remain unresolved. The advent of single-branch stents has provided the best endovascular solution for patients with lesions involving the left subclavian artery, but it cannot address lesions further proximal to the aorta. At this point, bi-branch embedded stents have appeared clinically, but due to their complex placement technique and reversal of the normal blood flow direction of the branches, they have not been widely used in clinical practice.

[0004] For patients with aortic dissection or aneurysm lesions involving the left common carotid artery in the aortic arch, there is an urgent need for a safe, reliable, and easy-to-operate stent structure. Summary of the Invention

[0005] The purpose of this invention is to provide an aortic branch stent graft system and device for reconstructing the left common carotid artery, which can realize the reconstruction of the left common carotid artery.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides an aortic branch stent graft system for reconstructing the left common carotid artery, comprising: a main stent, a branch stent, and a mesh window structure; the main stent is a hollow covered stent structure used to treat lesions in the aorta; the branch stent is positioned proximally near the main stent, with one end connected to the sidewall of the main stent, for the reconstruction of the left common carotid artery; the mesh window structure is positioned distally on the sidewall of the main stent near the starting portion of the branch stent, and the mesh window structure corresponds to the position of the left subclavian artery for subsequent reconstruction of the left subclavian artery.

[0008] In some specific designs, the main support structure is hollow inside, and both the proximal and distal ends of the main support structure have openings.

[0009] In some specific embodiments, the main support includes a support body and a covering film, wherein the covering film is disposed on the outer surface of the support body.

[0010] In some specific solutions, the proximal end of the main support is provided with a first inner identification structure and a first outer identification structure, and the distal end of the main support is provided with a second inner identification structure and a second outer identification structure. The first inner identification structure and the second inner identification structure are both used to identify the inner side of the main support, and the first outer identification structure and the second outer identification structure are both used to identify the outer side of the main support.

[0011] The main support is further provided with two position recognition structures at its proximal end for identifying whether the main support is twisted or rotated. The two position recognition structures are arranged opposite to each other, and each position recognition structure is located between the first inner recognition structure and the first outer recognition structure.

[0012] In some specific designs, the branch support is hollow inside, and both one end and the other end of the branch support are provided with openings. One end of the branch support is sewn to the side wall of the main support.

[0013] In some specific embodiments, the branch stent is provided with a first proximal identification structure, a second proximal identification structure, a third proximal identification structure, a fourth proximal identification structure, a first distal identification structure, and a second distal identification structure. The first proximal identification structure is used to identify the side of the proximal end of the branch stent that is close to the proximal end of the aorta. The second proximal identification structure is used to identify the side of the proximal end of the branch stent that is close to the distal end of the aorta. The third and fourth proximal identification structures are used to identify the proximal end of the branch stent. The first distal identification structure is used to identify the side of the distal end of the branch stent that is close to the proximal end of the aorta. The second distal identification structure is used to identify the side of the distal end of the branch stent that is close to the distal end of the aorta.

[0014] In some specific embodiments, the size of the mesh-like window structure is larger than the size of the origin of the left subclavian artery projected onto the aorta.

[0015] In some specific designs, the mesh window structure is made of woven mesh wires, and the mesh wires are provided with knots that are slidably connected to the mesh wires.

[0016] In some specific solutions, the edges of the mesh window structure are provided with a first edge recognition structure, a second edge recognition structure, a third edge recognition structure and a fourth edge recognition structure. The first edge recognition structure is used to identify the proximal end of the mesh window structure, the second edge recognition structure is used to identify the distal end of the mesh window structure, and the third edge recognition structure and the fourth edge recognition structure are arranged opposite to each other to identify the lateral boundary of the mesh window structure.

[0017] The present invention also provides an aortic branch stent graft device for reconstructing the left common carotid artery, comprising a first stent delivery system and the aortic branch stent graft system for reconstructing the left common carotid artery, wherein the first stent delivery system is used to deliver and release the aortic branch stent graft system for reconstructing the left common carotid artery to a predetermined location.

[0018] The present invention achieves the following technical effects compared to the prior art:

[0019] This invention relates to a branched stent for the reconstruction of the left common carotid artery, avoiding the covering of the left common carotid artery by the covered stent during endovascular aortic repair. The mesh-like window structure corresponds to the position of the left subclavian artery, reserving space for subsequent reconstruction of the left subclavian artery. This invention can repair the lesion site via a femoral artery approach, moving the proximal anchoring zone anteriorly to the left common carotid artery. Used in conjunction with an integrated single-branched stent in a nested configuration, it enables endovascular reconstruction of the left common carotid artery and left subclavian artery that fully conforms to physiological anatomy and follows the blood flow direction. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view of an aortic branch stent graft system for reconstructing the left common carotid artery according to some embodiments of the present invention;

[0022] Figure 2 This is a top-view axonometric view of an aortic branch stent graft system for reconstructing the left common carotid artery, according to some embodiments of the present invention.

[0023] Figure 3 This is a side view of an aortic branch stent graft system for reconstructing the left common carotid artery according to some embodiments of the present invention;

[0024] Figure 4This is a schematic diagram of the mesh window structure in some embodiments of the present invention;

[0025] Figure 5 A schematic diagram of the local structure of the lesion in a patient with aortic dissection;

[0026] Figure 6 This is a schematic diagram showing the positioning of the aortic branch stent graft system for reconstructing the left common carotid artery within the aorta in some embodiments of the present invention;

[0027] Figure 7 This is a schematic diagram illustrating the release of an aortic branch stent graft system for reconstructing the left common carotid artery within the aorta, according to some embodiments of the present invention.

[0028] Figure 8 This is a schematic diagram illustrating the release of a single-branch stent in the aorta using an aortic branch stent graft system for reconstructing the left common carotid artery, as described in some embodiments of the present invention.

[0029] In the diagram: 100 - Aortic branch stent graft system for reconstructing the left common carotid artery; 101 - Main stent; 102 - Branch stent; 103 - Mesh window structure; 104 - First medial identification structure; 105 - First lateral identification structure; 106 - Second medial identification structure; 107 - Second lateral identification structure; 108 - First proximal identification structure; 109 - Second proximal identification structure; 110 - Third proximal identification structure; 111 - Fourth proximal identification structure; 112 - First distal identification structure; 113 - Second distal identification structure; 114 - Mesh wire; 115 - Knot; 116 - First edge identification structure; 117 - Second edge identification structure; 118 - Third edge identification structure; 119 - Fourth edge identification structure; 120 - Position identification structure;

[0030] 601 - Ultra-hard guidewire; 602 - Branched traction guidewire; 603 - First support delivery system;

[0031] 801 - Branch segment of a single-branch stent; 802 - Main body of a single-branch stent; 803 - Partial coverage segment;

[0032] 11-Aortic arch; 12-Ascending aorta; 13-Descending aorta; 14-Bracocephalic trunk; 15-Left common carotid artery; 16-Left subclavian artery. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide an aortic branch stent graft system and device for reconstructing the left common carotid artery, which can realize the reconstruction of the left common carotid artery.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] like Figures 1 to 8 As shown, this embodiment provides an aortic branch stent graft system 100 for reconstructing the left common carotid artery. The left common carotid artery 15 is located between the brachiocephalic trunk 14 and the left subclavian artery 16. For patients with aortic dissection or aneurysm lesions involving the left common carotid artery 15, this embodiment of the aortic branch stent graft system 100 for reconstructing the left common carotid artery combines an integrated single-branch stent for reconstructing supra-arc double branches. This embodiment of the aortic branch stent graft system 100 for reconstructing the left common carotid artery includes: a main stent 101, a branch stent 102, and a mesh vent structure 103. The main stent 101, the branch stent 102, and the mesh vent structure 103 constitute an integrated structure. The main stent 101 is a hollow cladding. The stent structure is used to treat lesions in the aorta. The branch stent 102 is positioned near the proximal end of the main stent 101. The branch stent 102 can be used to close the primary aortic rupture and reconstruct the left common carotid artery 15. One end of the branch stent 102 is connected to the side wall of the main stent 101, and the connection point is located on the greater curvature side of the main stent 101. The mesh window structure 103 is positioned near the distal end of the main stent 101. The mesh window structure 103 is located on the side wall of the main stent 101 and on the greater curvature side of the main stent 101. The mesh window structure 103 corresponds to the position of the left subclavian artery 16. The mesh window structure 103 reserves space for the treatment of the left subclavian artery 16 for subsequent reconstruction of the left subclavian artery 16. This invention provides a safe, reliable, and easy-to-operate endovascular repair device that can repair lesions via the femoral artery approach, move the proximal anchoring zone forward to the left common carotid artery 15, and use it in conjunction with a single-branch stent to perform endovascular reconstruction of the left common carotid artery 15 and the left subclavian artery 16 that is completely in line with the physiological anatomy and blood flow direction.

[0038] In some specific designs, the main support 101 is cylindrical, hollow inside, and has openings at both the proximal and distal ends.

[0039] In some specific designs, the main support 101 includes a support body and a membrane, with the membrane applied to the outer surface of the support body. The support body is made of nickel-titanium alloy, and the membrane is made of a permeable polyester membrane.

[0040] In some specific designs, the proximal end of the main support 101 is provided with a first inner identification structure 104 and a first outer identification structure 105, and the distal end of the main support 101 is provided with a second inner identification structure 106 and a second outer identification structure 107. Both the first inner identification structure 104 and the second inner identification structure 106 are used to identify the inner side of the main support 101, and both the first outer identification structure 105 and the second outer identification structure 107 are used to identify the outer side of the main support 101. The first inner identification structure 104, the first outer identification structure 105, the second inner identification structure 106, and the second outer identification structure 107 are all made of metal. The first inner identification structure 104, the first outer identification structure 105, the second inner identification structure 106, and the second outer identification structure 107 can be configured with different shapes, or the first inner identification structure 104 and the second inner identification structure 106 can be configured with the same shape, and the first outer identification structure 105 and the second outer identification structure 107 can be configured with the same shape. For example, the first inner identification structure 104 and the second inner identification structure 106 can be rectangles, and the first outer identification structure 105 and the second outer identification structure 107 can be figure-eight shapes.

[0041] In some specific designs, two position identification structures 120 are also provided at the proximal end of the main support 101. The two position identification structures 120 are arranged opposite each other, and each position identification structure 120 is located between the first inner identification structure 104 and the first outer identification structure 105. That is, the first inner identification structure 104, one position identification structure 120, the first outer identification structure 105, and the other position identification structure 120 are evenly arranged circumferentially at the proximal end of the main support 101. In addition to marking, the first inner identification structure 104, one position identification structure 120, the first outer identification structure 105, and the other position identification structure 120 can achieve better intraoperative positioning and better observation of phenomena such as inversion and torsion.

[0042] In some specific designs, the branch support 102 is cylindrical and hollow inside. Both ends of the branch support 102 have openings. The connection between one end of the branch support 102 and the side wall of the main support 101 is a high-precision stitch. When not under pressure, the branch support 102 and the main support 101 are vertically aligned. Under pressure, the end of the branch support 102 connected to the main support 101 is fixed, while the position of the free end of the branch support 102 can change. The angle between the branch support 102 and the main support 101 can be 150°, and the free end of the branch support 102 can have a 150° lateral range of motion.

[0043] In some specific designs, the branch stent 102 is provided with a first proximal identification structure 108, a second proximal identification structure 109, a third proximal identification structure 110, a fourth proximal identification structure 111, a first distal identification structure 112, and a second distal identification structure 113. The first proximal identification structure 108 is used to identify the side of the proximal end of the branch stent 102 that is close to the proximal end of the aorta. The second proximal identification structure 109 is used to identify the side of the proximal end of the branch stent 102 that is close to the distal end of the aorta. The third proximal identification structure 110 and the fourth proximal identification structure 111 are used to identify the proximal end of the branch stent 102. The first proximal identification structure 108, the second proximal identification structure 109, the third proximal identification structure 110, and the fourth proximal identification structure 111 are used in endovascular aortic repair surgery for precise alignment and angular and directional identification of the proximal end of the branch stent 102 and the opening of the left common carotid artery. The first distal identification structure 112 is used to identify the side of the distal end of the branch stent 102 closest to the proximal end of the aorta, and the second distal identification structure 113 is used to identify the side of the distal end of the branch stent 102 closest to the distal end of the aorta. The first proximal identification structure 108, the second proximal identification structure 109, the third proximal identification structure 110, the fourth proximal identification structure 111, the first distal identification structure 112, and the second distal identification structure 113 are all made of metallic materials. The first proximal recognition structure 108, the second proximal recognition structure 109, the third proximal recognition structure 110, the fourth proximal recognition structure 111, the first distal recognition structure 112, and the second distal recognition structure can be configured with different shapes. Alternatively, the first proximal recognition structure 108 and the second proximal recognition structure 109 can be configured with the same shape, the third proximal recognition structure 110 and the fourth proximal recognition structure 111 can be configured with the same shape, and the first distal recognition structure 112 and the second distal recognition structure 113 can be configured with the same shape. For example, the first proximal recognition structure 108, the second proximal recognition structure 109, the third proximal recognition structure 110, the fourth proximal recognition structure 111, the first distal recognition structure 112, and the second distal recognition structure 113 can all be of the "O" shape.

[0044] In some specific designs, the mesh window structure 103 is elliptical, and the shape of the mesh window structure 103 matches the projection of the origin of the left subclavian artery 16 onto the aorta. The size (area) of the mesh window structure 103 is larger than the size (area) of the projection of the origin of the left subclavian artery 16 onto the aorta.

[0045] In some specific designs, the edge of the mesh window structure 103 is connected to the main support 101 by high-precision suturing. The mesh window structure 103 is woven from mesh wire 114, preferably fine metal wire. The mesh wire 114 is woven to form several quadrilateral holes. The mesh wire 114 is made of nickel-titanium alloy. Knots 115 are provided on the mesh wire 114 to connect with the mesh wire 114. The knots 115 are preferably sliding fisherman's knots. The knots 115 are set at the connection of adjacent holes. The sliding knots 115 allow the holes to be enlarged or reduced within a certain range, which is beneficial for subsequent interventional operations when reconstructing the left subclavian artery 16.

[0046] In some specific designs, the edges of the mesh window structure 103 are provided with a first edge recognition structure 116, a second edge recognition structure 117, a third edge recognition structure 118, and a fourth edge recognition structure 119. The first edge recognition structure 116 is used to identify the proximal end of the mesh window structure 103, the second edge recognition structure 117 is used to identify the distal end of the mesh window structure 103, and the third edge recognition structure 118 and the fourth edge recognition structure 119 are arranged opposite to each other. The first edge recognition structure 116 and the second edge recognition structure 117 are located at the two ends of the major axis of the ellipse, and the third edge recognition structure 118 and the fourth edge recognition structure 119 are located at the two ends of the minor axis of the ellipse. The third edge recognition structure 118 and the fourth edge recognition structure 119 are used to identify the lateral boundary of the mesh window structure 103. The first edge recognition structure 116, the second edge recognition structure 117, the third edge recognition structure 118, and the fourth edge recognition structure 119 can identify the position and orientation when the mesh window structure 103 is sewn to the support body. The first edge recognition structure 116, the second edge recognition structure 117, the third edge recognition structure 118, and the fourth edge recognition structure 119 are all made of metal. The first edge recognition structure 116, the second edge recognition structure 117, the third edge recognition structure 118, and the fourth edge recognition structure 119 are shaped like an "O". These structures can also be used to locate the edges of the mesh-like window structure 103 during intraoperative angiography, when subsequently reconstructing the left subclavian artery 16 using a single-branch stent (e.g.) Figure 8As shown), the first edge recognition structure 116 at the proximal end of the mesh window structure 103 should be covered by the proximal end of the single-branch stent covered stent, that is, the part of the covered segment 803 of the main body 802 of the single-branch stent coincides with the main stent 101, which can realize the physiological reconstruction of the left common carotid artery 15 and the left subclavian artery 16 above the aortic arch 11.

[0047] The mesh window structure 103 of this embodiment reserves processing space for the left subclavian artery 16, which can be used to increase the radial support force applied to the outer lumen of the main stent 101, and has a certain supporting effect on the local blood vessel wall, ensuring the integrity of the stent and reducing the risk of distal stent displacement caused by the blood flow "storm effect" during stent deployment.

[0048] The aortic branch stent graft system 100 for reconstructing the left common carotid artery in this embodiment is adapted to the anatomical structure of the aortic arch 11. Its implantation in the aortic arch 11 can be used to close the primary rupture and reconstruct the left common carotid artery 15. This aortic branch stent graft system 100 can be combined with an integrated single-branch stent implanted in the aorta to simultaneously treat the left common carotid artery 15 and the left subclavian artery 16, achieving reconstruction of the two branch vessels on the aortic arch 11. When used in conjunction with a single-branch stent, the aortic branch stent graft system 100 for reconstructing the left common carotid artery is deployed first, followed by the single-branch stent. From a three-dimensional perspective, the deployment of the aortic branch stent graft system 100 and the single-branch stent is nested. From a two-dimensional perspective, the docking method between the aortic branch stent graft system 100 and the single-branch stent is partial coverage. The proximal end of the single-branch stent is located on the main stent 101 between the branch stent 102 and the mesh window structure 103.

[0049] The aortic branch stent graft system 100 for reconstructing the left common carotid artery in this embodiment allows for anterior displacement of the proximal stent anchoring zone, broadening the indications for endovascular treatment of the aortic arch. The integrated structure of the main stent 101 and the branch stent 102 increases the stent's anchoring force, preventing stent displacement caused by the aortic blood flow "storm effect." The branch stent 102 enhances the radial expansion force in the left common carotid artery 15, preventing stenosis or occlusion of the branch vessels. In this embodiment, the main stent 101 is a complete hollow structure, and the branch stent 102 is externally positioned, preventing iatrogenic occlusion of the aortic arch 11 lumen and changes in hemodynamics. The lesion is treated via a total femoral artery approach. The aortic dissection involving the left common carotid artery 15 is repaired entirely endovascularly, eliminating the need for hybrid surgery for the reconstruction of the left common carotid artery 15. It can be used in conjunction with existing integrated single-branch stents to reconstruct the supra-arc bibranch, namely the left common carotid artery 15 and the left subclavian artery 16, ensuring that all reconstructed branches fully conform to the anatomical and physiological structure and hemodynamic pattern. The mesh window structure 103 reserved on the greater curvature side of the main stent 101 is made of nickel-titanium alloy wire and is fixed by a sliding knot 115. The window size of the mesh window structure 103 can be freely adjusted to facilitate subsequent reconstruction of the left subclavian artery 16, while reducing the risk of postoperative stenosis or occlusion of the left subclavian artery 16.

[0050] Example 2

[0051] like Figures 1 to 8 As shown, this embodiment provides an aortic branch stent graft device for reconstructing the left common carotid artery, including a first stent delivery system 603 and an aortic branch stent graft system 100 for reconstructing the left common carotid artery according to Embodiment 1. The first stent delivery system 603 is used to deliver and release the aortic branch stent graft system 100 for reconstructing the left common carotid artery to a predetermined location. The aortic branch stent graft system 100 for reconstructing the left common carotid artery can be used in conjunction with a single-branch stent. The first stent delivery system 603 closes the primary rupture and reconstructs the left common carotid artery 15 and the left subclavian artery 16 via a full femoral artery approach. When deploying the stent, the aortic branch stent graft system 100 for reconstructing the left common carotid artery is deployed first, followed by the single-branch stent. From a three-dimensional perspective, the deployment method between the aortic branch stent graft system 100 for reconstructing the left common carotid artery and the single-branch stent is nested; from a two-dimensional perspective, the docking method between the aortic branch stent graft system 100 for reconstructing the left common carotid artery and the single-branch stent is partial coverage.

[0052] The usage process of this embodiment:

[0053] For patients with aortic dissection or aneurysm involving the left common carotid artery 15, the Aortic Branch Stent Graft System 100 for reconstructing the left common carotid artery, combined with an integrated single-branch stent for reconstructing the supra-arc bibranch, was used. The Seldinger technique was used to puncture the right radial artery, left brachial artery, left common carotid artery 15, and right femoral artery, and insert catheter sheaths. Two Proglide linear staplers were pre-embedded in the right femoral artery for future use. A pigtail catheter was inserted through the right radial artery into the ascending aorta 12 for angiography and pressure measurement for future use. A gold-marked pigtail catheter was inserted through the right femoral artery approach, ascending via segmental angiography into the ascending aorta 12, marking the supra-arc branch sites. The Landerquist ultra-rigid guidewire 601 was replaced. A 5F single-curved catheter was placed in the left common carotid artery 15 via the femoral artery. The traction guidewire of the branch segment was advanced along the 5F single-curved catheter to the left common carotid artery 15 and pulled out of the body, then the 5F single-curved catheter was withdrawn. The aortic branch stent graft system 100 for reconstructing the left common carotid artery is advanced to the predetermined site on the aortic arch 11 (e.g., Figure 6 The branch segment was pulled into the left common carotid artery 15 by pulling the branch traction guide wire 602, and then intraoperative angiography was performed to determine the location of the aortic branch stent graft system 100 used to reconstruct the left common carotid artery. Finally, the main stent 101 and the branch stent 102 were completely released (e.g., Figure 7 The pigtail catheter was inserted into segment 12 of the ascending aorta. A second angiography confirmed that the stent was in place, in good condition, and that blood flow in the branch vessels was unobstructed with no obvious endoleak.

[0054] After confirming that the aortic branch stent graft system 100 for reconstructing the left common carotid artery is properly positioned, the first stent delivery system 603 is withdrawn. Then, the second stent delivery system with a single-branch stent is introduced into the descending aorta 13 along the ultra-rigid guidewire 601 and pushed to the predetermined site in the aorta. The branch segment 801 of the single-branch stent is introduced into the left subclavian artery 16 through the mesh window structure 103. The single-branch stent is released, so that the proximal end of the single-branch stent partially overlaps with the aortic branch stent graft system 100 for reconstructing the left common carotid artery. Finally, the reconstruction of the supra-arc bibranch of the aortic dissection patient, namely the left common carotid artery 15 and the left subclavian artery 16, is achieved via a total femoral artery approach using the aortic branch stent graft system 100 for reconstructing the left common carotid artery in conjunction with the integrated single-branch stent.

[0055] In this embodiment, the terms "proximal end" and "distal end" refer to the relative position and direction of the components relative to each other when viewed from the heart after the main stent is implanted in the human body. Generally, the proximal end refers to the end closer to the heart, and the distal end refers to the end farther away from the heart.

[0056] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0059] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0060] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0061] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0062] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0063] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A stent graft system for reconstructing aortic branches of the left common carotid artery, characterized in that: include: The system comprises a main stent, branch stents, and a mesh-like vent structure. The main stent is a hollow, covered stent structure used to treat lesions in the aorta. The branch stents are positioned proximally to the main stent, with one end connected to the sidewall of the main stent, and are used for the reconstruction of the left common carotid artery. The mesh-like vent structure is located distally to the sidewall of the main stent near the initiation of the branch stent, and corresponds to the position of the left subclavian artery, used for subsequent reconstruction of the left subclavian artery.

2. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The main support is hollow inside, and both the proximal and distal ends of the main support are provided with openings.

3. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The main support includes a support body and a cover film, the cover film being disposed on the outer surface of the support body.

4. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The main support has a first inner identification structure and a first outer identification structure at its proximal end, and a second inner identification structure and a second outer identification structure at its distal end. The first inner identification structure and the second inner identification structure are both used to identify the inner side of the main support, and the first outer identification structure and the second outer identification structure are both used to identify the outer side of the main support. The main support is further provided with two position recognition structures at its proximal end for identifying whether the main support is twisted or rotated. The two position recognition structures are arranged opposite to each other, and each position recognition structure is located between the first inner recognition structure and the first outer recognition structure.

5. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The branch bracket is hollow inside, and both one end and the other end of the branch bracket are provided with openings. One end of the branch bracket is sewn to the side wall of the main bracket.

6. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The branch stent is provided with a first proximal identification structure, a second proximal identification structure, a third proximal identification structure, a fourth proximal identification structure, a first distal identification structure, and a second distal identification structure. The first proximal identification structure is used to identify the side of the proximal end of the branch stent that is close to the proximal end of the aorta. The second proximal identification structure is used to identify the side of the proximal end of the branch stent that is close to the distal end of the aorta. The third and fourth proximal identification structures are used to identify the proximal end of the branch stent. The first distal identification structure is used to identify the side of the distal end of the branch stent that is close to the proximal end of the aorta. The second distal identification structure is used to identify the side of the distal end of the branch stent that is close to the distal end of the aorta.

7. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The size of the mesh-like window structure is larger than the size of the origin of the left subclavian artery projected onto the aorta.

8. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The mesh window structure is made of woven mesh wire, and the mesh wire is provided with knots that are slidably connected to the mesh wire.

9. The aortic branch stent graft system for reconstructing the left common carotid artery according to claim 1, characterized in that: The edges of the mesh window structure are provided with a first edge recognition structure, a second edge recognition structure, a third edge recognition structure and a fourth edge recognition structure. The first edge recognition structure is used to identify the proximal end of the mesh window structure, the second edge recognition structure is used to identify the distal end of the mesh window structure, and the third edge recognition structure and the fourth edge recognition structure are arranged opposite to each other to identify the lateral boundary of the mesh window structure.

10. A stent graft device for reconstructing aortic branches of the left common carotid artery, characterized in that: Includes a first stent delivery system and the aortic branch stent graft system for reconstructing the left common carotid artery as described in any one of claims 1-9, wherein the first stent delivery system is used to deliver and release the aortic branch stent graft system for reconstructing the left common carotid artery to a predetermined location.

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