Intravascular deliverable stent for reinforcement of vascular abnormalities

An abdominal aortic aneurysm and dilator technology, applied in the field of dilators, can solve problems such as insufficient metal density to limit the aortic aneurysm from contacting aortic blood pressure and the like

Inactive Publication Date: 2009-04-01
AGA MEDICAL CORP MS US
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device is uniformly braided, but necessarily its metal density is not high enough to limit the aortic aneurysm's exposure to the aortic blood pressure

Method used

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  • Intravascular deliverable stent for reinforcement of vascular abnormalities
  • Intravascular deliverable stent for reinforcement of vascular abnormalities
  • Intravascular deliverable stent for reinforcement of vascular abnormalities

Examples

Experimental program
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Embodiment Construction

[0016] see figure 1 , which shows a dilator / graft according to a preferred embodiment of the present invention, denoted by reference numeral 10 . A dilator / graft 10 is placed in a segment of the abdominal aorta 12 with an aneurysm 14 . The lower end of the abdominal aorta 12 branches into left and right common iliac arteries 16 and 18 . figure 1 Also shown are the renal arteries 20 and 22 that connect to the kidneys (not shown).

[0017] The dilator / graft 10 comprises a first length (L 1 ) of the innermost tubular structure 23. The innermost tubular structure comprises a plurality of first braided metal strands 24, preferably made of a shape memory alloy. The braid making up said innermost tubular structure 23 has a predetermined inclination and number of picks which define an opening through the structure sufficiently large so as not to substantially impede blood flow through its perforated walls. The diameter of the metal strands can be in the range of 0.002 to 0.010 ...

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Abstract

A stent / graft especially designed to be used in a minimally invasive surgical procedure for treating an abdominal aortic aneurysm (AAA) comprises an innermost tubular structure of a length (L1) formed by braiding a relatively few strands of shape memory alloy wire. The pick and pitch of the braid are such as to provide relative large fenestrations in the tubular wall. A portion of the innermost tubular structure of a length L2<L1 is surrounded by a further braided tubular structure having relatively many strands that occlude the fenestrations of the innermost tubular structure. The composite structure can be stretched to reduce the outer diameter of the stent / graft, allowing it to be drawn into a lumen of a delivery catheter. The catheter can then be advanced through the vascular system to the site of the AAA and then ejected, allowing it to self-expand with the portion L2 bridging the aneurysm. The portion L1>L2 does not block blood flow to the renal arteries while the portion L2 prevents the aneurysm to grown and burst.

Description

technical field [0001] The present invention relates generally to endovascular deliverable dilators for strengthening blood vessels, and more particularly to such a dilator specifically designed to address abdominal aortic aneurysms (AAA). Background of the invention [0002] An aortic aneurysm is a weakened area of ​​the aorta, the main blood vessel that carries blood from the heart to the rest of the body. Inside the chest, the aorta runs up from the heart and then arches down, across the chest (thoracic aorta) and into the abdomen (abdominal aorta). The normal diameter of the abdominal aorta is about 1 inch. As blood flows through the aorta, the area of ​​weakness bulges into a ball that bursts if it gets too large. [0003] In most cases, aortic aneurysms develop in the portion of the vessel below the origin of the renal arteries. An aortic aneurysm can extend into the blood vessels that supply the hip and pelvis. [0004] Once an aortic aneurysm reaches 5 cm in diam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/06
CPCA61F2/90A61F2210/0014A61F2/07A61F2002/075A61F2250/0015A61F2/852A61F2/856A61F2002/061D04C1/06D10B2401/046D10B2509/06
Inventor K·安普拉茨J·奥斯兰德P·卢梭
Owner AGA MEDICAL CORP MS US
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