Patent ID: 8486134

Claim:
A catheter assembly, comprising: (a) a catheter shaft having a distal end portion and a proximal end portion; (b) a main balloon positioned at the distal end portion of the catheter shaft, the main balloon operable between an unexpanded configuration and an expanded configuration; (c) a secondary balloon positioned at the distal end portion of the catheter shaft and mounted directly to an outer surface of an expandable portion of the main balloon, the secondary balloon operable between an unexpanded configuration in which the secondary balloon is positioned on the main balloon and an expanded configuration in which the secondary balloon extends radially outward from the outer surface of the main balloon; (d) a first structure defining a first inflation lumen, the first inflation lumen extending between the distal end portion and proximal end portion of the catheter shaft and configured to provide inflation fluid to the main balloon; (e) a second structure defining a second inflation lumen, the second inflation lumen extending between the distal end portion and proximal end portion of the catheter shaft and configured to provide inflation fluid to the secondary balloon, wherein the second structure extends through a portion of the main balloon; and (f) a valve member in fluid communication with the first inflation lumen and the second inflation lumen, the valve member configured to operate the secondary balloon between the unexpanded configuration to the expanded configuration independently of operation of the main balloon between the unexpanded and expanded configurations.