Patent ID: 7744619

Claim:
A catheter assembly comprising: a catheter shaft, the 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 therebetween, 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 fixed to the catheter shaft and the distal collar fixed to the catheter shaft, each collar having a nonactivated state and an activated state, in the nonactivated state the distal balloon waist being rotatable about the distal collar and the proximal balloon waist being rotatable about the proximal collar, in the activated state the proximal collar being expanded to sealingly engage the proximal balloon waist and the distal collar being expanded to sealingly engage the distal balloon waist.