A rectal balloon apparatus has a shaft with a fluid passageway extending therethrough. A balloon is affixed over an end of the shaft such that the fluid passageway communicates with an interior of the balloon. The balloon has a laterally flat surface thereon when inflated. The laterally flat surface of the balloon has a longitudinal groove formed thereon. A valve assembly is affixed to the shaft at an end opposite the balloon. The valve assembly selectively allows a fluid to pass therethrough to move the balloon from a non-inflated condition to an inflated condition. A fluid introducing means is removably attached to the valve assembly to introduce the fluid into the valve assembly.
