Helical stent having improved flexibility and expandability
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United States of America Patent
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Oct 18, 2011
Grant Date -
Oct 22, 2009
app pub date -
May 13, 2009
filing date -
Aug 30, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A stent includes a central portion of helically wound undulations formed of struts, cylindrical end portions, and transition zones between the helical portion and the cylindrical portions. According to a first aspect of the invention, the torsional flexibility of the stent is maximized by having bridges connecting adjacent winding be interrupted by the maximum possible number of undulations. In a preferred design, each winding includes nineteen undulations around the circumference, bridges are provided every five undulations. According to a second aspect of the invention, uniform, opening of the transition zone is achieved by altering the width, and thereby the flexibility, of a series of struts in accordance with their lengths. Specifically, the long transition zone struts are made wider.
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Cited Art Landscape
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