One device in accordance with the present invention includes a surgical device for creating channels in tissue of a patient. The device includes a catheter defining a lumen and a transducer assembly carried by the catheter along a lengthwise dimension of the catheter. An end effector is operatively coupled...http://www.google.com.au/patents/US6387109?utm_source=gb-gplus-sharePatent US6387109 - Methods and device for improving blood flow to heart of a patient
