An apparatus for sterilizing a female patient in a transcervical procedure comprises an elongated catheter with a piezoelectric ultrasound transducer at its distal end. The catheter is inserted transcervically into the uterus and guided to the intramural region of a fallopian tube. The transducer is...http://www.google.se/patents/US6972018?utm_source=gb-gplus-sharePatent US6972018 - Apparatus and method for transcervical sterilization by application of ultrasound
