Patent ID: 7837676

Claim:
A method of applying ultrasonic energy to cardiac tissue comprising: providing a catheter having an ultrasonic transducer and a structural balloon, the structural balloon sandwiched between first and second reflective balloons to form a first reflective interface at an interface between the structural balloon and the first reflective balloon and a second reflective interface at an interface between the structural balloon and the second reflective balloon, the second reflective interface spaced apart from and directed towards the first reflective interface so as to form a window therebetween; inserting the catheter in a heart of a mammalian subject and inflating the structural balloon and the first and second reflective balloons so that the window is aligned with a preselected region of cardiac tissue; and actuating the ultrasonic transducer to emit ultrasonic energy, the first and second reflective interfaces directing the ultrasonic energy through the window and into the preselected region of the cardiac tissue.