Covered stent for branch artery reconstruction

Abstract

The invention discloses a covered stent for branch artery reconstruction, and relates to the field of medical appliances, the covered stent comprises a covered stent main body, a plurality of branch stents are arranged on the circumferential surface of the covered stent main body, tubular covering films are arranged outside the covered stent main body and the branch stents, and one-way valves are arranged on the inner wall surfaces of the branch stents. The method has the advantages of being high in accuracy and success rate and simplified in operation process.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, and in particular to a covered stent for branch artery reconstruction. Background Art

[0002] Endovascular repair of the aortoiliac arteries (including the thoracic aorta, thoracoabdominal aorta, abdominal aorta, and iliac arteries) has made significant progress in the treatment of aortic aneurysms and dissections; traditional endovascular repair technology uses stents and covered stents to isolate damaged arteries to prevent aneurysm expansion and rupture; however, this method faces many challenges in dealing with branch artery reconstruction, especially for complex branch structures and high-risk patients.

[0003] The stents and covered stents currently used for aortoiliac artery repair have the following major defects in branch reconstruction: 1. Insufficient positioning accuracy: In the reconstruction of multi-branch arteries, how to accurately locate and reconstruct each branch artery is a major challenge; 2. High risk of complications: Postoperative complications such as endoleak, stent displacement, restenosis or occlusion of branch arteries may occur; 3. Poor stent adaptability: The existing stent design cannot fully adapt to various complex anatomical structures, especially for patients with many or irregular branch arteries, resulting in the inability to reconstruct branch arteries, bringing serious consequences; 4. Complex operation: The branch reconstruction process is complicated, the operation time is long, the operation is difficult, and it requires the collaboration of a multidisciplinary team. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the present invention provides a covered stent for branch artery reconstruction with high accuracy and success rate and simplified operation process.

[0005] The technical solution adopted by the present invention is: a coated stent for branch artery reconstruction, including a coated stent body, a circumferential surface of the coated stent body is provided with a plurality of branch stents, the exterior of the coated stent body and the branch stents are provided with a tubular coating, and the inner wall surface of the branch stent is provided with a one-way valve. Also included is an independently arranged guide wire, which penetrates into the branch stent in the reverse direction of the one-way valve.

[0006] The tubular coating is made of a polymer film, and the coating stent body and branch stents are made of nickel-titanium alloy.

[0007] The one-way valve has two valves and is symmetrically arranged. The fixed edge of the one-way valve is sutured to the inner wall surface of the branch stent and the free edge is located at the center of the branch stent.

[0008] The beneficial effects of the present invention are as follows: the covered stent body of the present technical solution has a special one-way valve structure at the position where the arterial branch needs to be reconstructed; the one-way valve can block the forward blood flow so that the forward blood flow will not pass through the stent, while allowing the reverse blood flow of the branch to pass through; this design is based on the physiological characteristic that the pressure of the main trunk of the human artery is higher than the pressure of the branch, ensuring that the blood flow will not leak out of the stent, and the guide wire can be easily passed along the valve structure through the outside of the stent into the main stent, and the channel can be established to reconstruct the branch arteries; the accuracy and success rate of the operation are improved, the operating process is simplified, and the risk of complications is reduced. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the structure of a covered stent for branch artery reconstruction according to an embodiment of the present invention.

[0009] Figure 2 Schematic diagram of the structure of a one-way valve. DETAILED DESCRIPTION

[0010] The embodiments of the present invention are further described below in conjunction with the accompanying drawings: As shown in the figure, a covered stent for branch artery reconstruction includes a covered stent body 1, a circumferential surface of the covered stent body 1 is provided with a plurality of branch stents 2, the outside of the covered stent body 1 and the branch stent 2 are provided with a tubular coating 5, and the inner wall surface of the branch stent 2 is provided with a one-way valve 3; the covered stent body of the present technical solution has a special one-way valve structure at the position where the arterial branch needs to be reconstructed; the one-way valve can block the forward blood flow, so that the forward blood flow will not pass through the stent, while allowing the reverse blood flow of the branch to pass through; this design is based on the physiological characteristic that the pressure of the main trunk of the human artery is higher than the pressure of the branch, ensuring that the blood flow will not leak out of the stent, and the guide wire can be easily passed through the outside of the stent along the valve structure into the main stent, and the branch arteries can be reconstructed after the channel is established; the accuracy and success rate of the operation are improved, the operation process is simplified, and the risk of complications is reduced. It also includes an independently arranged guide wire 4, which is inserted into the branch stent 2 in the reverse direction of the one-way valve 3; the guide wire technology is used to enter the stent in the reverse direction from the branch artery to reconstruct each branch artery; this method utilizes the natural flow direction of the branch artery, simplifies the operation steps, and improves the surgical accuracy. The guide wire is a prior art and will not be elaborated here.

[0011] The tubular coating 5 is made of a polymer film, and the coating stent body 1 and the branch stent 2 are made of nickel-titanium alloy; the one-way valve 3 has two valves and is symmetrically arranged, and the fixed edge of the one-way valve 3 is sutured to the inner wall surface of the branch stent 2 and the free edge is located at the center of the branch stent 2.

[0012] The material of the one-way valve 3 is the same as that of the artificial blood vessel, and the raw materials include polyester, polytetrafluoroethylene, polyurethane and natural mulberry silk.

[0013] The advantages of this embodiment include: 1. Improving surgical accuracy; the one-way valve structure makes blood flow easier to control, and reconstructs branch arteries through reverse blood flow, thereby improving surgical accuracy and success rate.

[0014] 2. Reduce the risk of complications; utilize pressure difference and one-way valve structure to avoid common complications such as endoleak and stent displacement, and reduce the frequency of postoperative monitoring and intervention.

[0015] 3. Improve adaptability; the coated stent design of this embodiment can adapt to a variety of complex anatomical structures, changing the characteristics of extremely high requirements for the positioning of pre-windowed or branched stents. Instead, it enters the stent from the branch in reverse to reconstruct, which is flexible to operate and can improve the success rate of the operation; it is especially suitable for patients with multi-branched arteries and irregular arterial structures, expanding the scope of application of endovascular repair.

[0016] 4. Simplify the operation process; through the guidewire technology, reverse reconstruction from the branch artery improves the operability of the operation, shortens the operation time, and reduces the difficulty of the operator's operation.

[0017] 5. Improve patient prognosis; through precise and low-risk branch reconstruction technology, the surgical effect is improved, and the patient's long-term prognosis and quality of life are improved.

[0018] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0020] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A stent graft for branch artery reconstruction, comprising a stent graft body (1), characterized in that: The circumferential surface of the stent graft body (1) is provided with a plurality of branch stents (2); the exteriors of the stent graft body (1) and the branch stents (2) are both provided with tubular coatings (5); and the inner wall surface of the branch stent (2) is provided with a one-way valve (3).

2. The covered stent for branch artery reconstruction according to claim 1, characterized in that: It also includes an independently arranged guide wire (4), which penetrates into the branch stent (2) in the reverse direction of the one-way valve (3).

3. The covered stent for branch artery reconstruction according to claim 1, characterized in that: The material of the tubular coating (5) is a polymer film, and the material of the coated stent body (1) and the branch stent (2) is a nickel-titanium alloy.

4. The covered stent for branch artery reconstruction according to claim 1, characterized in that: The one-way valve (3) has two valves and is symmetrically arranged; the fixed edge of the one-way valve (3) is sutured to the inner wall surface of the branch stent (2) and the free edge is located at the center of the branch stent (2).

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