an ultrasonic surgical liposuction apparatus comprises a piezoelectric crystal transducer assembly is connectable to an interchangeable operative probe and a damping body attached to the probe . the probe can be hollow , if aspiration of the fatty tissue is desired , or it can be solid . the damping body is largely formed of a plastic material , to prevent the propagation of the ultrasonic waves from that portion of the probe where the damping body is mounted , to the surrounding biological tissues . prevention of propagation of the ultrasonic energy from a portion of the probe prevents unwanted heating of that part of the surrounding tissues . the damping body can be removable or permanently affixed , such as by welding . the damping body can have a metal jacket covering a portion of the surface of the damping body , or the damping body can be entirely made of plastic . the damping body can also have an opening or a plurality of openings for aspiration of the fatty tissue .