A method and apparatus for performing transmyocardial revascularization using ultrasound is disclosed. The apparatus includes a phased array ultrasonic device that includes a plurality of ultrasonic transducer elements which are controlled using a feedback control system so that each ultrasonic transducer...http://www.google.com/patents/US6511444?utm_source=gb-gplus-sharePatent US6511444 - Transmyocardial revascularization using ultrasound
