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Stent, stent set and stent delivery system

A technology of radial support and metal, applied in stents, medical science, prostheses, etc., can solve the problems of insufficient radial support force of stents, difficult placement of transmission systems, impractical implementation, etc.

Active Publication Date: 2022-01-25
SHANGHAI FLOWDYNAMICS MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a large diameter dense mesh stent cannot be radially compressed to a small diameter, often requiring a thicker delivery system
This makes it difficult to place the delivery system through the femoral artery with a relatively small diameter, especially for Asians with relatively thin blood vessels, and even makes it impossible to implement
In order to reduce the diameter of the stent in its compressed state, thinner wires can be used to braid the stent, but this results in insufficient radial support of the stent for therapeutic purposes

Method used

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  • Stent, stent set and stent delivery system
  • Stent, stent set and stent delivery system
  • Stent, stent set and stent delivery system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0133] According to one embodiment, the stent of the present invention can be braided from three or more wires with different diameters. Such as Figure 6 , which shows a partially enlarged schematic view of a single layer of the scaffold of this embodiment. The stent is braided by a first wire 33 and two second wires 34a, 34b. Wherein the first wire 33 is a thin wire, which may have a diameter of 20-150 μm, preferably 50-150 μm. The second wires include first thick wires 34a, which may have a diameter of 150˜300 μm, and second thick wires 34b, which may have a diameter of 300˜600 μm. Among them, 6 to 12 strands can be used for the first thick strands, more than 4 strands can be used for the second thick strands, but no more than 12 strands at most, and the rest are the first strands. This embodiment also has other variants, such as two kinds of first filaments (for example, with diameters in the range of 20-100 μm and 100-150 μm, respectively) and one second filament, or t...

Embodiment 1

[0162] This embodiment provides figure 1 Stent of the structure shown, the stent is used in the region of the descending aorta. The stent is made of nickel-titanium alloy material and is formed by interweaving 54 first wires with a diameter of 100 μm and 12 second wires with a diameter of 400 μm. The stent is braided in 2 layers in the way of back braiding. Compilation method such as Figure 5 As shown in middle A, the proximal end is the smooth end of the braiding, and the distal end is two layers of hair. A small section of the outer burr is woven back, and the inner burr is placed inside the back-weaving section to prevent the burrs from being exposed and damaging the vessel wall.

[0163] The stent is tapered; the diameter of the proximal end is 45 mm, and the diameter of the distal end is 32 mm; the length is 8 cm. The stent can be fixed in length up to 24cm after being released in the blood vessel.

[0164] The metal coverage of the stent in this embodiment is 40% in...

Embodiment 2

[0167] This embodiment provides image 3 A stent of the configuration shown, used in the region of the ascending aorta to the aortic arch. The stent is made of nickel-titanium material and is formed by interweaving 120 first wires with a diameter of 100 μm and 8 second wires with a diameter of 400 μm. The stent is braided in 4 layers in the way of back braiding. Compilation method such as Figure 5 As shown in middle C, the proximal end is a smooth end that is fully back-braided, and the distal end is two layers of burrs placed on the inside of the stent, and two layers of back-braided edges are placed on the outside of the stent to prevent the burrs from being exposed and damaging the vessel wall.

[0168] The diameter of the part corresponding to the ascending aorta of the stent is 45 mm, and the length is 9 cm; the diameter of the part corresponding to the aortic arch is 32 mm, and the length is 6 cm. At a distance of 30mm from the proximal end of the stent, there is a n...

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Abstract

The invention relates to a stent, a stent set and a stent delivery system. The stent is used in the aorta and is characterized in that the stent is formed by weaving at least two kinds of first silk and second silk with different diameters, the stent is constructed to be at least partially compressible and extensible in the axial direction of the stent in a natural release state, the first silk has the diameter of 20-150 microns, and the second silk has the diameter of 150-800 microns. When the stent is used for treating aortic aneurysm and / or aortic dissection lesions, low liquid permeability and strong radial supporting force are provided for the required part in the aorta through the axial compressibility and extensibility of the stent, and the stent is easily assembled into the delivery system with the proper diameter through the axial extensibility of the stent. The invention further provides the stent set comprising the stent and the stent delivery system.

Description

technical field [0001] The present invention relates to a stent, a stent kit, a stent delivery system and a method for placing the stent by the delivery system, in particular to a stent, a stent kit and a delivery system for use in the treatment of aortic lesions such as aortic aneurysm or aortic dissection and systems and methods for placing stents. Background technique [0002] The arterial wall is composed of intima, media, and adventitia tightly fitting together. When the inner wall of the arterial vessel is partially damaged, under the strong impact of the arterial blood flow, the medial membrane of the arterial vessel wall is gradually peeled off, so that blood enters between the medial membrane and the adventitia of the vessel wall, forming two lumens, true and false. The most common is aortic dissection. An aortic dissection weakens the arterial wall and is at risk of rupture, which can kill the patient within minutes. [0003] Aortic dissection is divided into ty...

Claims

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Application Information

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IPC IPC(8): A61F2/90A61F2/962A61F2/97
CPCA61F2/90A61F2/962A61F2/97A61F2002/823A61F2210/0066A61F2/86A61F2250/0039A61F2250/0026A61F2250/0017A61F2250/0023A61F2210/0076A61F2250/0062A61F2002/826
Inventor 丁剑樊晨颖
Owner SHANGHAI FLOWDYNAMICS MEDICAL TECH CO LTD
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