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Bare stent capable of being compressed in axial direction

A bare stent, axial technology, applied in the field of bare stents, can solve the problems of insufficient radial support force of the stent, difficult placement of the transmission system, inability to implement, etc.

Pending Publication Date: 2022-01-07
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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  • Bare stent capable of being compressed in axial direction
  • Bare stent capable of being compressed in axial direction
  • Bare stent capable of being compressed in axial direction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0099] This example provides a similar figure 1 Bare stent of the shown configuration, which was used in the region of the descending aorta. The bare 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 bare 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.

[0100] The bare stent is tapered; the diameter of the proximal end is 45 mm, 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.

[0101] The metal coverage of the stent in t...

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Abstract

The invention relates to a bare stent capable of being compressed in an axial direction. The bare stent is used for an aorta and is formed by overlapping and interweaving at least two first wires and second wires with different diameters, in a natural release state, the bare stent has a metal coverage rate of at least 30%, and the diameter of the first wires is 20-150 micrometers, and the diameter of the second wires is 150-600 micrometers. When the bare stent is used for treating aortic aneurysm and / or aortic dissection lesion, low liquid permeability and strong radial supporting force are provided for a needed part in the aorta through the axial compressibility of the stent.

Description

technical field [0001] The invention relates to a bare stent, in particular to a bare stent used in the treatment of aortic lesions, such as aortic aneurysm or aortic dissection. 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 type A and type B according to the intimal tear site and extent (i.e., Stanford classification). Type A refers to lesions involving the ascending aorta. The site of dissection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/90A61F2/97
CPCA61F2/90A61F2/97A61F2210/0061A61F2210/0066A61F2210/0014A61F2210/0076A61F2002/823A61F2/962A61F2250/0017A61F2250/0023A61F2250/0026A61F2250/0039
Inventor 丁剑樊晨颖
Owner SHANGHAI FLOWDYNAMICS MEDICAL TECH CO LTD
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