A catheter assembly for use in radiation therapy of a patient by insertion into a vessel, passageway or cavity to deliver radioactive material to a treatment site within the patient. The distal end of the catheter assembly (10) includes a noncompliant inner balloon (18) therearound that is inflatable...http://www.google.com.au/patents/US7056274?utm_source=gb-gplus-sharePatent US7056274 - Catheter with concentric balloons for radiogas delivery and booster radiosources for use therewith
