A hyperthermia applicator comprises a generator of a focused ultrasonic beam comprising a main high frequency electric wave emitter and a main piezoelectric transducer and an echography device comprising an auxiliary high frequency electric pulse generator associated with an auxiliary piezoelectric transducer...http://www.google.se/patents/US4658828?utm_source=gb-gplus-sharePatent US4658828 - Apparatus for examining and localizing tumors using ultra sounds, comprising a device for localized hyperthermia treatment
