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Stents with low strut thickness and variable strut geometry

A technology of struts, axial length, applied in the direction of stents, medical science, prostheses, etc.

Inactive Publication Date: 2013-08-14
MERIL LIFE SCI PVT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Connecting links of variable width and thickness are provided for varying characteristics; however, none are specified for varying thicknesses along the longitudinal axis

Method used

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  • Stents with low strut thickness and variable strut geometry
  • Stents with low strut thickness and variable strut geometry
  • Stents with low strut thickness and variable strut geometry

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Experimental program
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Embodiment Construction

[0058] Detailed description of the preferred embodiment

[0059] Such as Figure 1 to Figure 4 As described in , the preferred embodiment of the invention comprises a stent 3 consisting of a central portion 8 and identical end portions 6 and 7 along the longitudinal axis of the stent. All sections have expandable strut elements 9', 9", 12', 12" and 13 with multiple sinusoidal wave shaped sections 9 (closed) and 12 (open) by direct connection or via "s The "shaped connecting rods are connected in a specific way to form the whole of the stent. The closed unit 9 of this sinusoidal shape has struts 9' and 9", as Figure 5 shown. The sinusoidally shaped open cell 12 has struts 12' and 12", as Figure 6 shown. The legs 9' and 9" of the closed unit 9 are connected to each other along their length to form joints 11 and at their tips to form joints 10, as Figure 5 shown. Such as Figure 6 As shown, open cells 12 in one row are connected to open cells 14 in the next row by "s" ...

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Abstract

The invention disclosed herein is a balloon expandable metallic stent with low and uniform strut thickness for implantation in a body lumen such as artery. The stent consists of variable geometry of scaffold structure consisting of cells with open and closed configuration across its axial length to impart differential mechanical strength to different parts. The closed cell configuration is stronger than the open cell configuration and hence offers more resistance to radial expansion than the open cell configuration. The stent is divided into distinct sections of rows of closed and open cells. By providing closed cells in the end portions and open cells in the central portion of a stent, the dog-boning effect can be eliminated. Other configurations can be created by making only one end section of the stent with closed cells or no section with closed cells. The thickness of the stent made from cobalt-chromium alloy L-605 could be reduced to as low as 35 microns with adequate radial strength as well as fatigue resistance. The stent with thinner struts and elimination of dog-boning effect are known to reduce arterial injury.

Description

technical field [0001] The present invention relates to balloon-expandable stents capable of being implanted into a mammalian body cavity, such as a blood vessel. Background technique [0002] Stents are used to treat atherosclerotic stenosis or other types of blockages in body lumens such as blood vessels or to dilate narrowed lumens due to disease. The function of the stent is to enlarge the diameter of the lumen by depressing the plaque on the vessel wall and then keep the lumen of the vessel open where it is implanted. Stents can be bare metal or can be coated with therapeutic agents and / or biocompatible materials to produce beneficial effects such as reducing inflammation, minimizing restenosis, etc. [0003] The stent is cylindrical in the shape of a stent structure. Such structures are formed on metal pipes by cutting the pipe with a laser beam. The metal tube is made of biocompatible materials such as stainless steel, cobalt chrome, tantalum, platinum, etc. The l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/915
CPCA61F2002/91583A61F2230/0054A61F2250/0041A61F2/915A61F2002/91558A61F2250/0029A61F2250/0018A61F2/82
Inventor R·G·维亚斯U·D·塔科尔
Owner MERIL LIFE SCI PVT
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