A medical instrument uses solid tapered cones mounted to a preferably concave, spherically curved, piezoelectric ultrasound transducer which focuses and concentrates the ultrasound energy to a narrow tip so very high levels of ultrasound can be delivered to the tissue adjacent to the tip. Ultrasound...http://www.google.com/patents/US6500133?utm_source=gb-gplus-sharePatent US6500133 - Apparatus and method for producing high intensity focused ultrasonic energy for medical applications
