A system 1000 for use in a medical procedure includes a catheter 100 defining a balloon lumen, at least one balloon 112 that is secured to an outer surface of the catheter, and a regulator 200 that is at least partially disposed within the balloon lumen. The regulator includes proximal 204 and distal end 206 portions, and defines a passage 210 extending from the proximal end portion to the distal end portion. The distal end portion of the regulator includes an outer surface defining at least one opening 216 that is in fluid communication with the passage. The at least one opening of the regulator is movable within the balloon lumen to control fluid communication between the passage and the at least one balloon.
