A device for dilating a body passage includes an inner element including a shaft portion extending longitudinally from a proximal end to a distal end and an enlarged portion situated in the distal end and an outer sleeve extending longitudinally from a proximal end to a distal end and including a lumen extending therethrough. The lumen is sized and shaped to slidably accommodate the shaft portion of the inner element such that the device is movable between an insertion configuration, in which the enlarged portion extends distally past the distal end of the outer sleeve, and an expanded configuration, in which the distal end of the outer sleeve receives the enlarged portion of the inner element therein.
