Ultrasound handpiece

摘要

A handpiece having at least one set of piezoelectric elements polarized to produce longitudinal motion when excited at the relevant resonant frequency. The piezoelectric crystals are connected to an ultrasonic horn to which a cutting tip is attached. The horn and/or the cutting tip contains a plurality of diagonal slits or grooves. The slits or grooves produce optimized torsional movement in the cutting tip when the piezoelectric crystals are excited at a second resonant frequency.

主权项

1. An ultrasonic hand piece, comprising:
a shell; and an ultrasonic horn held within the shell, the horn configured to produce torsional movement of a cutting tip in response to a drive signal having a first frequency and a first amplitude and longitudinal movement of the cutting tip 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 horn is 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 hand piece opposite the cutting tip.