Ultrasonic handpiece
First Claim
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1. An ultrasonic handpiece, comprising:
- a) a handpiece shell;
b) an ultrasound horn held within the shell, the horn containing a plurality of circumferential, diagonal slits sized and spaced so as to produce torsional movement in the horn in response to a drive signal having a first frequency and longitudinal movement in the horn in response to a drive signal having a second frequency; and
c) a plurality of piezoelectric elements;
wherein the piezoelectric elements and the horn are held within the shell so that a torsional nodal point and a longitudinal nodal point are coincident.
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Abstract
A handpiece having a single 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. Preferably, the two drive frequencies are not coincident, but provided in non-overlapping pulses.
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Citations
2 Claims
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1. An ultrasonic handpiece, comprising:
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a) a handpiece shell;
b) an ultrasound horn held within the shell, the horn containing a plurality of circumferential, diagonal slits sized and spaced so as to produce torsional movement in the horn in response to a drive signal having a first frequency and longitudinal movement in the horn in response to a drive signal having a second frequency; and
c) a plurality of piezoelectric elements;
wherein the piezoelectric elements and the horn are held within the shell so that a torsional nodal point and a longitudinal nodal point are coincident. - View Dependent Claims (2)
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Specification