According to one general aspect, there is an double-balloon breast brachytherapy catheter comprising, an outer-balloon that is filled with a liquid substance or air via an out-balloon-filler an inner-balloon that is filled with a liquid substance or air via an inner-balloon-filler, wherein the inner-balloon is inserted inside the outer-balloon a plurality of radiation-tubes connected to an outside boarder of the inner balloon a vacuum-tube that is wrapped around an exterior of the outer-balloon, wherein the vacuum tube is used to remove human fluids and air to create a void and a flexible-shaft is connected to an upper-head, a proximal-tail and a distal-tip, wherein the upper-head is covered by the outer-balloon, the inner-balloon, the plurality of radiation-tubes and the vacuum-tube.
