Reducing trapezoidal hepatic vein stent for Budd-Chiari syndrome
By designing a trapezoidal hepatic venous stent, using a braided frame and memory nickel alloy material, the problem that the existing stent cannot meet the clinical hepatic venous variability needs is solved, and firm support and structural strength of the hepatic venous blood vessels are achieved.
Patent Information
- Application Number
- CN202411231390.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2024-12-13
AI Technical Summary
The existing hepatic venous stents cannot meet the clinical needs of hepatic venous diameter, especially at the distal center, which can easily cause blockage, resulting in serious consequences.
A variable diameter trapezoidal hepatic vein stent for Bugat syndrome is designed, which adopts a braided frame, consisting of multiple variable diameter frames, with a gradient diameter, and a bent wire bending, with a bending angle butt, and evenly distributed welding points. The holes are located between the variable diameter frames and the material can be made of memory nickel alloy.
The stent can conform to the venous vascular structure with a thinner diameter of the telecentric port and the largest diameter of the proximal port, which improves the overall structural strength and support effect and reduces the risk of blockage.
Smart Images
Figure CN119112457A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a venous stent, in particular to a variable-diameter trapezoidal hepatic venous stent for Budd-Chiari syndrome, belonging to the technical field of medical devices. Background Art
[0002] The blood of the liver is supplied by the portal vein and the hepatic artery. The portal vein and the hepatic artery are divided into many small branches in the liver. The blood flowing through the liver passes through these branches, the hepatic vein or other veins, and finally is injected into the inferior vena cava. If the hepatic vein or any part from the hepatic vein to the inferior vena cava is blocked, the blockage may be caused by thrombosis, but it may be caused by non-thrombotic factors, which in turn causes the pressure of the portal vein or the inferior vena cava to increase, causing a series of clinical manifestations, namely Budd-Chiari syndrome. Interventional surgery is the first choice for the treatment of Budd-Chiari syndrome, which is less invasive and has good results. For patients with thrombosis in the inferior vena cava or hepatic vein, intubation and thrombolysis can be performed first. After the thrombus is completely dissolved, a venous stent can be used for dilation treatment to expand the narrowed blood vessels.
[0003] In the prior art, an intrahepatic portal-systemic vein shunt stent disclosed in announcement number CN209437424U includes a tubular inner covering, one end of the inner covering expands outward to form an inner covering expansion, an outer metal mesh is tightly fitted on the outer wall of the inner covering, one end of the outer metal mesh expands outward to form a bare area of the metal mesh expansion, and a plurality of metal balls are arranged at the intersection of the bare area of the metal mesh expansion and the end of the inner covering expansion. By expanding the opening of one end of the covered stent into a "trumpet-shaped" shape, and using four metal marking points on the expanded part as the boundary between the covered part and the metal mesh part, the stent is tightly fitted to the wall of the portal vein, and the best It can minimize the impact on the blood flow at the distal end of the portal vein shunt, reduce tissue regeneration in the stent, prevent stent occlusion and "capping" phenomenon, and can accurately position the stent under DSA. It is suitable for precise intrahepatic portosystemic shunt surgery. However, in actual application, only the end is expanded outward to form an inner membrane expansion. Although it can play a certain expansion and support role, the current hepatic vein structure is that the distal end is thinner, the proximal end has the largest diameter and then gradually decreases. For existing stents, the body is often mainly a body of equal diameter. This structure cannot meet the clinical use of the hepatic vein when released, and it is very easy to cause blockage of the distal end, resulting in serious consequences. Summary of the invention
[0004] The purpose of the present invention is to provide a variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome in order to solve the problem that the existing stents cannot meet the clinical hepatic vein diameter change requirements.
[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: A variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome, comprising a braided frame body, the braided frame body is composed of a plurality of variable diameter frames, the variable diameter frames are arranged in sequence from top to bottom, and the diameters of the variable diameter frames are arranged in sequence in a gradient shape; The diameter-changing frame is formed by bending a braided wire, the braided wire is provided with a plurality of bending angles, and two adjacent diameter-changing frames are butt-jointed together through the bending angles.
[0006] As a further solution of the present invention: the material of the braided wire used to form the variable diameter frame includes but is not limited to memory nickel alloy material.
[0007] As a further solution of the present invention: the frame of the braiding frame is a variable diameter trapezoidal shape, and the overall length of the braiding frame is 2.5-4cm, the diameter of the variable diameter frame at the distal end of the braiding frame is 7-10mm, and the diameter of the variable diameter frame at the proximal end of the braiding frame is 10-14mm.
[0008] As a further solution of the present invention: the braiding frame is provided with a plurality of meshes, the meshes are located between the upper and lower diameter-changing frames, and the meshes are composed of a combination of bent sections of the braiding wires.
[0009] As a further solution of the present invention: the mesh holes are diamond-shaped holes in the shape of "◇", and the length of the hole side of the mesh holes is 3-5mm.
[0010] As a further solution of the present invention: welding points are formed by welding between the bending angles formed by bending the braided wire, and the welding points are evenly distributed on the ring body of each diameter-changing frame.
[0011] The beneficial effects of the present invention are: 1. The braided frame provided in the present invention includes a plurality of variable diameter frames, which are arranged in sequence from top to bottom, and the diameters of the variable diameter frames are arranged in sequence in a gradient shape, so that the braided frame formed can be in the shape of a variable diameter ladder, thereby being able to support a vein having a thinner distal port and a largest proximal port; 2. The braided wires provided in the present invention are bent, and the bending corners of the braided wires constituting the upper and lower variable diameter frames are connected, which can improve the overall structural strength of the venous stent and ensure that it is firm and not easy to loosen. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the overall structure of the braided frame of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the braided frame of the present invention; Figure 3 It is a schematic diagram of the variable diameter frame structure of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the variable diameter frame of the present invention.
[0013] In the figure: 1, braided frame, 11, diameter-changing frame, 12, braided wire, 13, bending angle, 14, welding point, 15, mesh. DETAILED DESCRIPTION
[0014] 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.
[0015] Embodiment 1, as Figures 1 to 4 As shown, a variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome includes a braided frame 1, which is composed of a plurality of variable diameter frames 11. The variable diameter frames 11 are arranged sequentially from top to bottom, and the diameters of the variable diameter frames 11 are arranged sequentially in a gradient shape, so that the braided frame 1 is in the shape of a variable diameter trapezoid, and can be used to support a vein with a thinner distal port diameter and a largest proximal port diameter; The variable diameter frame 11 is formed by bending a braided wire 12, and the braided wire 12 is provided with a plurality of bending angles 13. Two adjacent variable diameter frames 11 are butt-jointed together through the bending angles 13, which can improve the overall structural strength of the venous stent and ensure that it is firm and not easy to loosen.
[0016] Embodiment 2. In addition to all the technical features of Embodiment 1, this embodiment also includes: the material of the braided wire 12 used to constitute the variable diameter frame 11 includes but is not limited to memory nickel alloy material. The nickel alloy has the strongest supporting force at 37°, that is, when the human body is at normal body temperature, the bracket can have the strongest supporting force, thereby ensuring that the bracket has a better supporting effect.
[0017] The frame of the braided frame 1 is a variable diameter trapezoidal shape, and the overall length of the braided frame 11 is 2.5-4 cm. The diameter of the variable diameter frame 11 at the distal end of the braided frame 1 is 7-10 mm, and the diameter of the variable diameter frame 11 at the proximal end of the braided frame 1 is 10-14 mm.
[0018] The braiding frame 1 has a plurality of meshes 15, which are located between the upper and lower variable diameter frames 11, and are composed of bent sections of the braiding wires 12. Therefore, when braiding, the braiding wires 12 only need to be bent, and there is no need to perform more deformation structures on the braiding wires 12.
[0019] Embodiment 3: In addition to all the technical features of Embodiment 1, this embodiment also includes: the mesh 15 is a diamond-shaped hole in the shape of "◇", and the hole side length of the mesh 15 is 3-5mm.
[0020] The braided wire 12 is bent to form welding points 14 between the bending angles 14, and the welding points 14 are evenly distributed on the ring body of each reducing frame 11, so that a multi-point combined connection is formed between the upper and lower two reducing frames 11, thereby ensuring the firmness of the connection of multiple reducing frames 11.
[0021] The braided frame body 1 is in the shape of a variable diameter trapezoid, so it can be used to support veins with a thinner distal port diameter and a larger proximal port diameter. The bending corners 13 of the braided wires 12 that constitute the upper and lower variable diameter frames 11 are connected, which can improve the overall structural strength of the venous stent, ensure that it is sturdy and not easy to loosen, and further improve the structural strength of the main support frame, so as to achieve firm support for the veins.
[0022] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0023] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome, comprising a braided frame (1), characterized in that: The braiding frame (1) is composed of a plurality of variable diameter frames (11), the variable diameter frames (11) are arranged sequentially from top to bottom, and the diameters of the variable diameter frames (11) are arranged sequentially in a gradient shape; The diameter-changing frame (11) is formed by bending a braided wire (12), the braided wire (12) is provided with a plurality of bending angles (13), and two adjacent diameter-changing frames (11) are butt-jointed together via the bending angles (13).
2. The variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome according to claim 1, characterized in that: The material of the braided wire (12) used to form the variable diameter frame (11) includes, but is not limited to, memory nickel alloy material.
3. The variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome according to claim 1, characterized in that: The frame of the braided frame (1) is in the shape of a variable diameter trapezoid, and the overall length of the braided frame (1) (1) is 2.5-4 cm, the diameter of the variable diameter frame (11) at the distal end of the braided frame (1) is 7-10 mm, and the diameter of the variable diameter frame (11) at the proximal end of the braided frame (1) is 10-14 mm.
4. The variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome according to claim 1, characterized in that: The braided frame (1) is provided with a plurality of mesh holes (15), the mesh holes (15) are located between the upper and lower diameter-changing frames (11), and the mesh holes (15) are composed of a combination of bent sections of the braided wire (12).
5. The variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome according to claim 4, characterized in that: The mesh holes (15) are diamond-shaped holes in a "◇" shape, and the hole side length of the mesh holes (15) is 3-5 mm.
6. The variable diameter trapezoidal hepatic vein stent for Budd-Chiari syndrome according to claim 1, characterized in that: The braided wires (12) are bent to form welding points (14) between the bending angles (14) formed by welding, and the welding points (14) are evenly distributed on the ring body of each diameter-changing frame (11).