A medical device includes a catheter (10), an expandable balloon (14) on the distal portion of the catheter (18), and a sheath (12) that is configured to enclose and protect the expandable balloon. The sheath extends within a sheath lumen (46) of the catheter and out from the catheter through a distal opening of the sheath lumen. When in a deployed configuration, the sheath extends proximally to enclose at least a portion of the expandable balloon. The sheath may be axially moveable within the sheath lumen of the catheter to actuate from the deployed configuration to a retracted configuration. In moving to the retracted configuration, the sheath may expose the outer surface of the expandable balloon.
