A double-balloon brachytherapy catheter includes an outer-balloon that is filled with a liquid substance or air via an outer-balloon-filler. Further, an inner-balloon is filled with a liquid substance or air via an inner-balloon-filler, with the inner-balloon inserted inside the outer-balloon. Additionally, a plurality of radiation-tubes is positioned in association within the inner-balloon, such as to an outside border of the inner-balloon and within the outer-balloon. Each radiation-tube out of the plurality is segmented into segments of differing hardness. In addition, a vacuum-tube can be wrapped around an exterior of the outer-balloon, where the vacuum tube is used to remove fluids and air to create a void. Also, the plurality of radiation-tubes can be configured to run longitudinally along a central shaft of the double-balloon brachytherapy catheter.