An electrode of the self-resonant, single-turn loop type adapted for attachment to a source of radio frequency energy to produce deep-heating by hyperthermia. The electrode is characterized by being a long cylindrical electrode having a small diameter to length radio as, for example, 0.5 to 1. The electrode...http://www.google.se/patents/US4402309?utm_source=gb-gplus-sharePatent US4402309 - Therapeutic magnetic electrode
