Patent ID: 7922740

Claim:
A catheter assembly comprising: an outer catheter shaft, the outer catheter shaft having a length and an outer surface; an inner catheter shaft, the inner catheter shaft having a length and an outer surface; a balloon, the balloon comprising a proximal balloon waist, a distal balloon waist and a body portion there between, a proximal balloon cone extending between the proximal balloon waist and the balloon body, a distal balloon cone extending between the distal balloon waist and the balloon body; the balloon having an expanded state and a unexpanded state, in the expanded state the body portion having an expanded diameter and in the unexpanded state the body portion having an unexpanded diameter that is less than the expanded diameter; and a proximal collar and a distal collar, the proximal collar fixedly engaged to the outer catheter shaft and the distal collar fixedly engaged to the inner catheter shaft, each collar having a body portion and at least one lip portion, the at least one lip portion extending radially outward from the body portion, each collar having a nonactivated state and an activated state, in the nonactivated state the balloon being rotatable around the proximal collar and the distal collar, in the nonactivated state each lip portion constructed and arranged to abut a portion of the balloon to prevent the balloon from moving longitudinally relative thereto, in the activated state the body portion of the proximal collar being expanded to sealingly engage at least a portion of the proximal balloon waist and the distal collar being expanded to sealingly engage at least a portion of the distal balloon waist.