Helical stent having improved flexibility and expandability

Details Helical stent having improved flexibility and expandability Helical stent having improved flexibility and expandability

2005-04-12

2005-04-12

Pellegrino, Brian E (Department: 3738)

Prosthesis (i.e., artificial body members), parts thereof, or ai

Arterial prosthesis

Stent structure

C623S001220

Reexamination Certificate

active

06878162

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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patent: PCTUS01/16431 (2001-05-01), None

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