Patent ID: 8512340

Claim:
An ultrasonic dissection tip for use with an ultrasonic generator, said tip comprising: an ultrasonic resonator having a body, a first proximal end, a coupling feature at said first proximal end for coupling to the ultrasonic generator, and a second distal end, said second distal end capable of a torsional motion amplitude, a longitudinal motion amplitude, or a longitudinal-torsional motion amplitude when said first proximal end is excited by the ultrasonic generator producing a displacement; said body having three sections of decreasing outer diameter from said proximal end to said second distal end wherein said three sections include a proximal section, a distal section, and a middle section between said proximal and distal sections; a plurality of helical grooves formed in said middle section; a path extending from said proximal end to said second distal end; a substantially conical cutting surface adjacent said second distal end with a smallest radius of said conical cutting surface at said second distal end; said conical cutting surface having an arc of at least 180 degrees relative to a central axis; a plurality of cutting teeth having a pyramidal or tetrahedral form on said conical cutting surface; and said cutting teeth having a pitch less than or equal to two times at least one of said amplitudes.