The invention provides a device for treating tumors at a target site, the device having a first balloon containing a radio isotope; a second balloon encasing the first balloon wherein the second balloon includes structures to create a void between the first balloon and the second balloon; and a third balloon encasing the second balloon, wherein the third balloon facilitates removal of material from the target site. The invention also provides a method for treating a tumor excise site, the method simultaneously exposing the tumor to heat and radiation.