A brachytherapy device is provided for treating a target tissue through an external surface area of the target tissue. The device includes an insertion member having a proximal portion, a distal portion, and at least one lumen extending therethrough. A fluid retaining member is mated to the distal portion...http://www.google.com/patents/US7494457?utm_source=gb-gplus-sharePatent US7494457 - Brachytherapy apparatus and method for treating a target tissue through an external surface of the tissue
