An abdominal aorta endovascular treatment branch stent system

Abstract

The present invention discloses an abdominal aorta intraluminal treatment branch stent system, comprising a main stent and four V-shaped embedded accessories for assisting the branch stent to enter the fenestration site; four arterial fenestration sites are provided on the main stent, the four V-shaped embedded accessories are arranged in the main stent, and the four V-shaped embedded accessory window outlets of the four V-shaped embedded accessories are detachably plugged into the four arterial fenestration sites in a one-to-one correspondence. The V-shaped embedded accessories can assist the branch stent to enter the branch, and the upper and lower double openings are reserved to adapt to different reconstruction methods. The V-shaped embedded accessories are better suitable for short neck and perinephric abdominal aortic aneurysms, which is beneficial to reducing the proximal anchor point requirements, saving the stent placement time during intravascular interventional surgery, and reducing the risk of graft infection.

Description

Technical Field

[0001] The present invention relates to medical auxiliary equipment, in particular to an abdominal aorta intracavitary treatment branch stent system, which can be applied to intracavitary interventional surgeries such as intracavitary repair of abdominal aortic aneurysms involving important branches. Background Art

[0002] The abdominal aorta is the largest blood vessel in the body, responsible for transporting oxygenated blood from the heart to the trunk and lower extremities. However, various diseases, such as atherosclerosis, hypertension, or genetic factors, can lead to structural changes in the abdominal aortic wall, forming an abdominal aortic aneurysm or abdominal aortic dissection.

[0003] Endovascular aortic repair (EVAR) is an important treatment strategy for this disease. This strategy mainly involves the use of a specialized stent inserted into the abdominal aorta through minimally invasive surgery to restore the normal function of the blood vessel. However, when the aneurysm involves important branches of the abdominal aorta, such as the renal arteries or abdominal intestinal trunk, traditional EVAR technology faces challenges because a simple EVAR stent may block the blood supply to these branch vessels, leading to serious complications.

[0004] To solve this problem, researchers have developed branched stent technology, which mainly includes fenestrated endovascular aortic repair (FEVAR) and branched endovascular aortic repair (BEVAR).

[0005] The stent design of this technology includes one or more small windows or branches to connect to the blood vessel branches originally affected by the aneurysm. Through these small windows or branches, a dedicated covered vascular stent can be inserted into the affected blood vessel branches, maintaining blood supply and thus ensuring the normal function of the branch organs.

[0006] However, the current FEVAR and BEVAR stents on the market still have limitations. For example, the stent design is not personalized enough and may not adapt to all patient anatomy. The deployment process is complex and may require experienced doctors to perform accurately. In addition, the products on the market may not be suitable for all types of abdominal aortic disease, so it is necessary to develop a new type of abdominal aortic endovascular treatment branch stent.

[0007] The design and development of novel abdominal aortic endovascular branched stents should focus on the following aspects: personalized design to accommodate diverse anatomical structures, ease of deployment to reduce surgical time and complexity, high-quality materials to ensure long-term stability and biocompatibility, and broad adaptability to various abdominal aortic diseases. This novel branched stent is expected to provide an effective, safe, and easy-to-use option for the treatment of abdominal aortic disease. Summary of the Invention

[0008] In order to improve the problem in existing branch stent technology that the branch stent may easily cause damage to the inner wall of the artery when being pulled into the branch artery, the present application provides an abdominal aorta intraluminal treatment branch stent system that is effective, safe and easy to operate.

[0009] The technical solution of the present invention is: an abdominal aorta intraluminal treatment branch stent system, comprising a main stent;

[0010] The main stent is provided with four arterial window locations, the four arterial window locations being: an opening for the celiac artery corresponding to the celiac artery, an opening for the mesenteric artery corresponding to the mesenteric artery, an opening for the right renal artery corresponding to the right renal artery, and an opening for the left renal artery corresponding to the left renal artery;

[0011] Includes 4 V-shaped embedded accessories for assisting branch stents to enter the fenestration area;

[0012] Each V-shaped embedded accessory includes two upper and lower tubular side walls, the upper tubular side wall is inclined upward, and the lower tubular side wall is inclined downward, and the lower opening of the upper tubular side wall is connected with the upper opening of the lower tubular side wall to form a V-shaped embedded accessory window outlet, the upper opening of the upper tubular side wall is the upper entrance of the V-shaped embedded accessory, and the lower opening of the lower tubular side wall is the lower entrance of the V-shaped embedded accessory;

[0013] The four V-shaped embedded accessories are arranged in the main body bracket, and the four V-shaped embedded accessory window outlets of the four V-shaped embedded accessories are detachably plugged into the four arterial window positions in a one-to-one corresponding manner.

[0014] Furthermore, the V-shaped embedded attachment is a mesh structure as a whole, which can minimize the impact on the normal blood flow in the stent.

[0015] Furthermore, an annular anti-skid ring is provided at the window outlet of the V-shaped embedded accessory to prevent the V-shaped embedded accessory from sliding toward the inside of the main body bracket.

[0016] Furthermore, both the upper and lower tubular sidewalls are curved. The upper inlet of the V-shaped embedded accessory faces upward, with its central axis parallel to the central axis of the main support. The lower inlet of the V-shaped embedded accessory faces downward, with its central axis parallel to the central axis of the main support. This further facilitates the insertion of catheters and branch stents into the V-shaped embedded accessory.

[0017] The present invention has at least one of the following beneficial effects: In the aforementioned vascular stent and system, the V-shaped embedded attachment facilitates insertion of the branch stent, and the reserved upper and lower openings accommodate various reconstruction methods. The V-shaped embedded attachment is more suitable for short-necked and perinephric abdominal aortic aneurysms, facilitating reduced proximal anchor point requirements, shortening stent placement time during endovascular interventional procedures, and reducing the risk of graft infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the vascular stent system provided in this application.

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-vascular stent.

[0020] Figure 3 yes Figure 1 Medial view of the mid-vessel stent system.

[0021] Figure 4 yes Figure 3 Schematic diagram of the V-shaped embedded attachment of the mid-vascular stent system.

[0022] Figure 5 yes Figure 3 Side view of the V-shaped embedded attachment of the Mid-Vascular Stent System.

[0023] Figure 6 This is a schematic diagram of the structure of the branch stent after it is released from the arterial branch.

[0024] Figure 7 It is a schematic diagram of the structure of the catheter entering the window through the upper blood vessel of the human body.

[0025] Figure 8 It is a schematic diagram of the structure of the catheter entering the window through the blood vessels below the human body.

[0026] Explanation of the accompanying figures: 1. Main stent; 2. Opening of the celiac artery; 3. Opening of the mesenteric artery; 4. Opening of the right renal artery; 5. Opening of the left renal artery; 6. V-shaped embedded accessory; 7. Inner wall of the main stent; 8. Window outlet of the V-shaped embedded accessory; 9. Upper entrance of the V-shaped embedded accessory; 10. Lower entrance of the V-shaped embedded accessory; 11. Mesh structure of the V-shaped embedded accessory; 12. Annular non-slip ring at the window outlet of the V-shaped embedded accessory; 13. Aortic intima; 14. Branch artery; 15. Branch stent; 16. Catheter; 17. Abdominal aorta; 18. Left renal artery; 19. Right renal artery; 20. Left common iliac artery; 21. Left external iliac artery. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0028] It should be noted in advance that in the field of interventional medical devices, the proximal end refers to the end of the stent close to the heart after the stent is used for interventional treatment, and the distal end refers to the end of the stent away from the heart after the stent is used for interventional treatment.

[0029] To address the issue of existing branch stent technology that can damage the inner wall of a branch artery when inserted into it, this application provides an abdominal aortic endovascular branch stent system that assists in inserting the branch stent into the branch artery. This system is applicable to short-necked and perinephric abdominal aortic aneurysms. Persons skilled in the art should be aware that this technical solution is not limited to short-necked and perinephric abdominal aortic aneurysms. In actual operation, the stent in this technical solution is in close contact with the vascular intima. The gaps in the accompanying drawings are provided to facilitate a better understanding of the overall structure.

[0030] See also Figures 1 to 3The present application provides a vascular stent system, including a branch stent system for intraluminal treatment of the abdominal aorta. The system includes a main stent 1 and four V-shaped embedded accessories 6 for assisting the branch stents in entering the fenestration sites. The main stent 1 has four fenestration sites: a celiac artery opening 2 corresponding to the celiac artery, a mesenteric artery opening 3 corresponding to the mesenteric artery, a right renal artery opening 4 corresponding to the right renal artery, and a left renal artery opening 5 corresponding to the left renal artery. The V-shaped embedded accessories 6 are intended to assist the branch stents in entering these fenestration sites. Each V-shaped embedded accessory 6 includes two upper and lower tubular sidewalls, the upper tubular sidewall tilted upward and the lower tubular sidewall tilted downward, and the lower opening of the upper tubular sidewall is connected to the upper opening of the lower tubular sidewall to form a V-shaped embedded accessory window outlet 8. The upper opening of the upper tubular sidewall is the upper inlet 9 of the V-shaped embedded accessory, and the lower opening of the lower tubular sidewall is the lower inlet 10 of the V-shaped embedded accessory. The four V-shaped embedded accessories 6 are arranged in the main frame 1, and the four V-shaped embedded accessory window outlets 8 of the four V-shaped embedded accessories 6 are detachably plugged into the four arterial window positions in a one-to-one corresponding manner.

[0031] See also Figures 4 and 5 In this application, the V-shaped embedded attachment 6 has a mesh structure 11, which can minimize the impact on normal blood flow within the stent. In addition, the window outlet 8 of the V-shaped embedded attachment is surrounded by an annular anti-slip ring 12 to prevent the V-shaped embedded attachment 6 from sliding inwardly toward the main stent 1.

[0032] Preferably, both the upper and lower tubular sidewalls are curved arc-shaped structures. The upper inlet 9 of the V-shaped embedded accessory faces upward, with its central axis parallel to the central axis of the main frame 1. The lower inlet 10 of the V-shaped embedded accessory faces downward, with its central axis parallel to the central axis of the main frame 1. This further facilitates the entry of catheters and branch stents into the V-shaped embedded accessory.

[0033] See also Figures 6 to 8 When the endovascular interventional surgical approach is from above the body (e.g., the radial artery), taking the placement of a right renal artery branch stent as an example, the catheter 16 is guided from the upper opening 9 of the V-shaped embedded accessory, and then the branch stent is released through the window outlet 8 of the V-shaped embedded accessory, so that its proximal end is anchored to the V-shaped embedded accessory 6. Similarly, when the endovascular interventional surgical approach is from below the body (e.g., the femoral artery), taking the placement of a left renal artery branch stent as an example, the catheter 16 is guided from the lower opening 10 of the V-shaped embedded accessory, and then the branch stent is released through the window outlet 8 of the V-shaped embedded accessory, so that its proximal end is anchored to the V-shaped embedded accessory 6.

[0034] The above embodiments are merely descriptions of the preferred embodiments of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary engineering and technical personnel in this field should fall within the scope of protection determined by the claims of the present application.

Claims

1. An abdominal aorta endovascular treatment branch stent system, characterized by: It includes a main body bracket (1); The main stent (1) is provided with four arterial window locations, the four arterial window locations being: a celiac artery opening (2) corresponding to the celiac artery, a mesenteric artery opening (3) corresponding to the mesenteric artery, a right renal artery opening (4) corresponding to the right renal artery, and a left renal artery opening (5) corresponding to the left renal artery; Includes four V-shaped embedded attachments (6) for assisting the branch stent in entering the fenestration site; Each V-shaped embedded accessory (6) includes two upper and lower tubular side walls, the upper tubular side wall is inclined upward, and the lower tubular side wall is inclined downward, and the lower opening of the upper tubular side wall is connected with the upper opening of the lower tubular side wall to form a V-shaped embedded accessory window outlet (8), the upper opening of the upper tubular side wall is the upper inlet (9) of the V-shaped embedded accessory, and the lower opening of the lower tubular side wall is the lower inlet (10) of the V-shaped embedded accessory; The four V-shaped embedded accessories (6) are arranged in the main support (1), and the four V-shaped embedded accessory window outlets (8) of the four V-shaped embedded accessories (6) are detachably plugged into the four arterial window locations in a one-to-one correspondence; The V-shaped embedded accessory window outlet (8) is provided with an annular anti-slip ring (12) to prevent the V-shaped embedded accessory (6) from slipping off toward the inside of the main frame (1); The upper inlet (9) of the V-shaped embedded accessory faces upward and the central axis is parallel to the central axis of the main support (1); The lower inlet (10) of the V-shaped embedded accessory faces downward and its central axis is parallel to the central axis of the main frame (1).

2. The abdominal aorta endovascular treatment branch stent system according to claim 1, characterized in that: The V-shaped embedded attachment (6) is a mesh structure as a whole.

3. The abdominal aorta endovascular treatment branch stent system according to claim 1, characterized in that: The upper circular tubular side wall and the lower circular tubular side wall are both curved arc structures.

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