Patent 8414611 was granted and assigned to Boston Scientific on April, 2013 by the United States Patent and Trademark Office.
A catheter having a multi-chamber balloon which includes a first chamber having a globular configuration and an adjacent second chamber having a generally cylindrical body portion are sequentially inflatable so when employed to enlarge an opening through a stent deployed at a bifurcation the stent is supported around the circumference of the side-branch opening while the stent wall opening is being enlarged.