Patent ID: 8414611

Claim:
A medical device balloon having a proximal end, a distal end, and a longitudinal axis, the balloon comprising: a first balloon portion at the proximal end of the balloon, the first balloon portion defining a first chamber and having a globular configuration with a maximum perpendicular dimension (D 1 ) taken in a plane perpendicular to the longitudinal axis of the balloon and an axial length (D 3 ) which is not more than about 20% greater than the maximum perpendicular dimension (D 1 ), and an adjacent second balloon portion, the second balloon portion defining a second chamber and having a generally cylindrical body portion which has a diameter (D 2 ) which is less than the first chamber diameter axial length (D 3 ), wherein the first balloon portion is proximal of the second balloon portion, the first balloon portion has a proximal end that defines the proximal end of the balloon, the second balloon portion has a distal end that defines the distal end of the balloon, and the first balloon portion has an inwardly inverted conical portion disposed at the proximal end of the balloon.