Thomas O. Bales, Jr.;Peter K. Kratsch;Kenneth E. Perry;Thomas O. Bales; Jr.
发明人:
Thomas O. Bales, Jr.,Peter K. Kratsch,Kenneth E. Perry
申请号：
US11074806
公开号：
US08512391B2
申请日:
2005.03.08
申请国别(地区):
US
年份:
2013
代理人:
摘要：
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.
