The invention is directed to a radiation delivery catheter assembly for maintaining patency of a body lumen for a period of time sufficient to allow delivery of a radiation source to the body lumen. The catheter utilizes an inflatable region which maintains and centers the catheter in the body lumen....http://www.google.fr/patents/US6224535?utm_source=gb-gplus-shareBrevet US6224535 - Radiation centering catheters
