Abstract: The present invention provides a device for displacing healthy or normal tissue away from radiation exposure during brachytherapy. In one embodiment, the device of the present invention comprises an inflatable component attached to the ring of a tandem and ring brachytherapy applicator. When the tandem and ring applicator is inserted, the balloon is deflated so that patient discomfort is minimized. Once the ring is in the correct position, the balloon is inflated and the rectum is displaced. The balloon remains inflated during any image guidance that is performed and for the duration of the brachytherapy treatment. The balloon is deflated prior to the removal of the ring from the body.