Ultrasound handpiece
First Claim
Patent Images
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.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. An ultrasonic hand piece, comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. An ultrasonic hand piece, comprising:
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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 applied continuously and the drive signal having the second frequency is pulsed; 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. - View Dependent Claims (6)
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7. An ultrasonic hand piece, comprising:
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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 pulsed and the drive signal having the second frequency is applied continuously; 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. - View Dependent Claims (8)
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9. An ultrasonic hand piece, comprising:
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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 and the drive signal having the second frequency are applied continuously 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. - View Dependent Claims (10)
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11. An ultrasonic hand piece, comprising:
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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 second amplitude; wherein the drive signal having the first frequency and the drive signal having the second frequency are provided in pulses that overlap completely; 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. - View Dependent Claims (12, 13)
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14. A phacoemulsification hand piece comprising:
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a shell; a horn with proximal and distal ends, the horn at least partially located in the shell, the horn producing torsional movement in a tip in response to a drive signal having a first frequency and a first amplitude and longitudinal movement in the tip in response to a drive signal having a second frequency and a second amplitude; the tip coupled to the distal end of the horn; a plug located near a proximal end of the horn, the plug sealing the horn to the shell; wherein a torsional nodal point and a longitudinal nodal point are coincident at the plug. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification