US Patent 6971994 Method and apparatus for focussing ultrasonic energy

An apparatus for treatment of subcutaneous tissue including ultrasonic, e.g. piezoelectric, generators to generate ultrasonic vibrations. Each generator has a lens to focus the ultrasonic vibration at a point within the tissue. The focal point may be moved so that the generated ultrasonic vibrations may be focussed exactly at a point within the tissue that requires treatment. The energy enters the surface of the body over a very wide area, and therefore causes minimum damage to healthy overlying tissue.