Multi-lumen shaft used with endoscopic device

An apparatus for use with a medical instrument, comprising:

• a manifold having a first fluid coupling port, a second fluid coupling port, and a third fluid coupling port;
• a shaft having a first lumen connecting the first fluid coupling port to ta first output port, a second lumen connecting the second fluid coupling port to a second output port, a third lumen connecting the third fluid coupling port to a third output port, and a fourth lumen for accepting a guide wire;
• a strain relief sheath extending over a portion of the shaft;
• and
• a single expandable vessel coupled to the first output port;
• wherein the second output port is positioned distally from the first output port and and the third output port is positioned proximally from the first output port such that inflation of the single expandable vessel in a duct will block fluid communication in the duct between the second output port and the third output port.