Patent ID: 7645256
Filing Date: 2010-01-12
Classification: A61B,A61F

Abstract:
1. An ultrasonic handpiece, comprising: a) a handpiece shell; b) an ultrasound horn held within the shell; and c) a plurality of piezoelectric elements connected to the horn, the piezoelectric elements producing torsional movement in the horn in response to a drive signal having a first frequency and a first amplitude and longitudinal movement in the horn in response to a drive signal having a second frequency and a second amplitude; wherein the drive signal having the first frequency is alternated with the drive signal having the second frequency; and further wherein the piezoelectric elements and the horn are held within the shell so that a torsional nodal point and a proximal longitudinal nodal point are coincident at a plug that seals the shell on an end of the handpiece opposite a cutting tip.