A medical device (100) includes a balloon member (102), a port (108) that couples a compartment interior (106) of the balloon member to a region exterior of the balloon member, and a tubular member (104) that defines a lumen (105). A distal end (114) of the tubular member is attached to an internal surface (112) of the balloon member within the compartment so that a portion of the internal surface of the balloon member provides a seal (115) at a distal end (118) of the lumen. The tubular member passes through the port, and the proximal (end 122) of the tubular member is configured to remain exterior of the compartment. A delivery of a sufficient amount of a filling material into the lumen of the tubular member causes a length of the tubular member to pass through the port and into the balloon compartment.
