Reducing dense net support

Abstract

The utility model discloses a variable-diameter dense net support, and relates to the technical field of medical instruments. Comprising at least one variable-diameter dense net outer stent and an equal-diameter dense net stent, the diameter of the dense net outer stent is gradually reduced in the length direction, the diameter of the near end of the outer stent is larger than that of the far end of the outer stent, and the opposite ends of the near end and the far end expand outwards in a horn mouth shape. The diameter of each part of the dense net outer stent is reasonably designed, so that the dense net outer stent can better adapt to the characteristic that the near end of a blood vessel is thick and the far end is thin, has better adherence and more appropriate supporting force, and remarkably changes the flow state of blood flow in aneurysm and reduces the impact of the blood flow on the aneurysm by utilizing the principle of haemodynamics on the premise of not influencing the flow state of blood flow of other communicated blood vessels; and endothelial cells grow along the stent skeleton, the neck of the aneurysm is gradually repaired, the aneurysm is cured, and the stent is specially used for complex aneurysm with high treatment difficulty, such as large, giant or Y-type or X-type vascular aneurysm which is not suitable for clipping or embolism due to too small aneurysm, and has a wide application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a variable diameter dense mesh bracket. Background Art

[0002] The latest interventional treatment device for intracranial vascular aneurysms in the human body is the dense mesh stent, which is a small-diameter, high-PPI braided stent made of extremely fine cobalt-cadmium-nickel alloy wire, platinum-tungsten alloy wire, nickel-titanium wire, platinum-iridium wire, etc. The high surface tension between the stent meshes forms an interception barrier at the neck of the aneurysm in the blood vessel, which reduces the speed of blood flowing into the aneurysm, reduces the flow rate, changes the direction of blood flow, and flows along the lumen of the dense mesh stent, further coagulating and polarizing the blood in the aneurysm body, and finally forming an embolic mass, which is then endothelialized on the surface of the stent at the neck of the aneurysm to achieve the effect of vascular reconstruction.

[0003] Currently, dense mesh stents (or blood flow guiding devices) on the market are all separate dense mesh structures with equal diameter and variable diameter. For some large aneurysms or aneurysms in complex locations within the skull, such as Y-type or X-type aneurysms, separate dense mesh stents have problems such as poor wall adhesion, difficulty in releasing the position, the stent cannot completely cover the aneurysm neck, and the risk of stent displacement is high. Summary of the invention

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a variable diameter dense mesh bracket, comprising at least one variable diameter dense mesh outer bracket and an equal diameter dense mesh bracket, the diameter of the dense mesh outer bracket gradually decreases along the length direction, the proximal end diameter of the outer bracket is larger than the distal end, and the opposite ends of the proximal end and the distal end are flared outward in a trumpet-shaped manner, the dense mesh bracket is nested in the distal end of the dense mesh outer bracket, and the grid density of the dense mesh outer bracket is less than the grid density of the dense mesh bracket.

[0005] As a preferred technical solution of the utility model, the proximal port diameter of the proximal end is L1, the proximal end diameter is L2, the distal end diameter is L3, the dense mesh support diameter is L4, and the distal port diameter of the distal end is L5.

[0006] As a preferred technical solution of the utility model, the proximal end and the distal end of the dense mesh external stent are connected by a transition section, and the diameter of the transition section gradually changes from L2 to L3 along the length direction.

[0007] As a preferred technical solution of the present utility model, L1 is greater than L2, and the difference between L1 and L2 is greater than 1 nm.

[0008] As a preferred technical solution of the present utility model, L2 is greater than L3, and the difference between L2 and L3 is greater than 1 nm.

[0009] As a preferred technical solution of the present utility model, L5 is greater than L3, the difference between L5 and L3 is greater than 1 nm, and the difference between L4 and L3 is greater than 1 nm.

[0010] As a preferred technical solution of the utility model, the proximal port at the proximal end and the distal port at the distal end are expanded outward in a trumpet-shaped manner.

[0011] As a preferred technical solution of the utility model, the dense mesh external stent is woven from nickel-titanium alloy wires, and platinum-tungsten developing rings are provided at the proximal and distal ends of the dense mesh external stent.

[0012] As a preferred technical solution of the utility model, the dense mesh bracket is woven by mixing cobalt-based alloy wires and platinum-tungsten developing wires.

[0013] As a preferred technical solution of the utility model, the difference in mesh density between the dense mesh outer bracket and the dense mesh bracket is greater than 1 times, and the dense mesh outer bracket and the dense mesh bracket are fixed by platinum wire passing through the mesh at multiple points and being bound.

[0014] Compared with the prior art, the utility model provides a variable diameter dense mesh bracket, which has the following beneficial effects:

[0015] The variable-diameter dense mesh stent has a rationally designed diameter of each part of the dense mesh outer stent, which can better adapt to the characteristics of the blood vessel being thick at the proximal end and thin at the distal end, and has better wall adhesion and more appropriate support. By utilizing the "hemodynamics" principle, it significantly changes the blood flow pattern in the aneurysm without affecting the blood flow pattern of other communicating blood vessels, reduces the impact of blood flow on the aneurysm, allows endothelial cells to grow along the stent skeleton, gradually repairs the aneurysm neck, and cures the aneurysm. It is specifically designed for complex and difficult-to-treat aneurysms, such as large, giant aneurysms or aneurysms that are too small to be clipped or embolized, Y-type or X-type vascular aneurysms, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural cross-sectional view of a variable diameter dense mesh bracket proposed by the utility model;

[0017] Figure 2 This is a structural cross-sectional view of a variable diameter dense mesh bracket proposed by the utility model.

[0018] In the figure: 1, dense mesh external support; 11, proximal end; 12, distal end; 13, transition section; 14, proximal end port; 15, distal end port; 2, dense mesh support. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-2 A variable diameter dense mesh stent comprises at least one variable diameter dense mesh outer stent 1 and an equal diameter dense mesh stent 2, the diameter of the dense mesh outer stent 1 gradually decreases along the length direction, the diameter of the proximal end 11 of the outer stent is larger than the distal end 12, and the opposite ends of the proximal end 11 and the distal end 12 are flared outward in a trumpet shape, the dense mesh stent 2 is nested in the distal end 12 of the dense mesh outer stent 1, the mesh density of the dense mesh outer stent 1 is less than the mesh density of the dense mesh stent 2, the mesh of the dense mesh stent 2 is denser, which can change the blood flow state and play a role in blood flow guidance, thereby achieving artery occlusion and gradually shrinking the aneurysm.

[0021] As a specific technical solution of this embodiment, the diameter of the proximal port 14 of the proximal end 11 is L1, the diameter of the proximal end 11 is L2, the diameter of the distal end 12 is L3, the diameter of the dense mesh stent 2 is L4, the diameter of the distal port 15 of the distal end 12 is L5, the proximal end 11 and the distal end 12 of the dense mesh external stent 1 are connected by a transition section 13, and the diameter of the transition section 13 gradually changes from L2 to L3 along the length direction, L1 is greater than L2, the difference between L1 and L2 is greater than 1nm, L2 is greater than L3, the difference between L2 and L3 is greater than 1nm, L5 is greater than L3, the difference between L5 and L3 is greater than 1nm, and L4 The difference with L3 is greater than 1nm. When there is no external force, L4 is greater than L3. The diameters of various parts of the dense mesh external stent 1 are reasonably controlled, and a variable-diameter dense mesh external stent 1 and an equal-diameter dense mesh stent 2 are designed. By utilizing the principle of "hemodynamics", the blood flow pattern in the aneurysm is significantly changed without affecting the blood flow pattern of other communicating blood vessels, the impact of blood flow on the aneurysm is reduced, and endothelial cells are allowed to grow along the stent skeleton, gradually repairing the aneurysm neck and curing the aneurysm. It is specifically designed for complex aneurysms that are difficult to treat, such as large, giant aneurysms or aneurysms that are too small to be clipped or embolized, Y-type or X-type vascular aneurysms, etc.

[0022] As a specific technical solution of this embodiment, the proximal port 14 of the proximal end 11 and the distal port 15 of the distal end 12 are trumpet-shaped and expand outward. This design can enhance the blood vessel adhesion of the dense mesh external stent 1 and reduce the risk of displacement of the dense mesh external stent 1.

[0023] As a specific technical solution of this embodiment, the dense mesh external stent 1 is woven from nickel-titanium alloy wires, and the proximal end 11 and the distal end 12 of the dense mesh external stent 1 are both provided with platinum tungsten developing rings. The setting of the platinum tungsten developing rings, in conjunction with external developing equipment, can achieve precise positioning, which is conducive to the accurate release of the dense mesh external stent 1.

[0024] As a specific technical solution of this embodiment, the dense mesh bracket 2 is woven from a mixture of cobalt-based alloy wires and platinum-tungsten developing wires. The dense mesh bracket 2 woven from a mixture of cobalt-based alloy wires and platinum-tungsten developing wires can be developed as a whole and accurately positioned, which is conducive to the accurate release of the dense mesh bracket 2.

[0025] As a specific technical solution of this embodiment, the mesh density difference between the dense mesh outer bracket 1 and the dense mesh bracket 2 is greater than 1 times, and the dense mesh outer bracket 1 and the dense mesh bracket 2 are fixed by passing platinum wire through the mesh at multiple points and binding, which can effectively avoid the relative movement of the dense mesh bracket 2 and the dense mesh outer bracket 1.

[0026] In summary, the variable-diameter dense mesh stent has a reasonable design of the diameter of each part of the dense mesh outer stent 1, can better adapt to the characteristics of the thick proximal end 11 and the thin distal end 12 of the blood vessel, has better wall adhesion and more appropriate support force, and by utilizing the "hemodynamics" principle, without affecting the blood flow state of other communicating blood vessels, significantly changes the blood flow state in the aneurysm, reduces the impact of blood flow on the aneurysm, allows endothelial cells to grow along the stent skeleton, gradually repairs the aneurysm neck, and cures the aneurysm. It is specifically designed for complex and difficult-to-treat aneurysms, such as large, giant or aneurysms that are too small to be clipped or embolized, Y-type or X-type vascular aneurysms, and has broad application prospects.

[0027] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations 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 includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0028] 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 variable diameter dense mesh bracket, characterized in that: The invention comprises at least one dense mesh external stent (1) with a variable diameter and one dense mesh stent (2) with a constant diameter, wherein the diameter of the dense mesh external stent (1) gradually decreases along the length direction, the diameter of the proximal end (11) of the external stent is larger than that of the distal end (12), and the opposite ends of the proximal end (11) and the distal end (12) are flared outward in a trumpet-shaped manner, the dense mesh stent (2) is nested in the distal end (12) of the dense mesh external stent (1), and the mesh density of the dense mesh external stent (1) is smaller than the mesh density of the dense mesh stent (2).

2. The variable diameter dense mesh bracket according to claim 1, characterized in that: The diameter of the proximal port (14) of the proximal end (11) is L1, the diameter of the proximal end (11) is L2, the diameter of the distal end (12) is L3, the diameter of the dense mesh stent (2) is L4, and the diameter of the distal port (15) of the distal end (12) is L5.

3. The variable diameter dense mesh bracket according to claim 1, characterized in that: The proximal end (11) and the distal end (12) of the dense mesh external stent (1) are connected via a transition section (13), and the diameter of the transition section (13) gradually changes from L2 to L3 along the length direction.

4. The variable diameter dense mesh bracket according to claim 2, characterized in that: L1 is greater than L2, and the difference between L1 and L2 is greater than 1 nm.

5. The variable diameter dense mesh bracket according to claim 2, characterized in that: L2 is greater than L3, and the difference between L2 and L3 is greater than 1 nm.

6. The variable diameter dense mesh bracket according to claim 2, characterized in that: L5 is greater than L3, the difference between L5 and L3 is greater than 1nm, and the difference between L4 and L3 is greater than 1nm.

7. The variable diameter dense mesh bracket according to claim 1, characterized in that: The proximal port (14) of the proximal end (11) and the distal port (15) of the distal end (12) expand outward in a trumpet-shaped manner.

8. The variable diameter dense mesh bracket according to claim 1, characterized in that: The dense mesh external stent (1) is woven from nickel-titanium alloy wires, and a platinum-tungsten developing ring is provided at the proximal end (11) and the distal end (12) of the dense mesh external stent (1).

9. The variable diameter dense mesh bracket according to claim 1, characterized in that: The dense mesh support (2) is formed by mixing and weaving cobalt-based alloy wires and platinum-tungsten developing wires.

10. The variable diameter dense mesh bracket according to claim 1, characterized in that: The mesh density difference between the dense mesh external support (1) and the dense mesh support (2) is greater than 1, and the dense mesh external support (1) and the dense mesh support (2) are fixed by binding by platinum wires passing through the mesh at multiple points.

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