Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Reexamination Certificate
2006-05-18
2009-11-10
Benson, Walter (Department: 2837)
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
C310S316010, C600S512000
Reexamination Certificate
active
07614878
ABSTRACT:
A magnetostrictive ultrasonic dental scaler is disclosed. The magnetostrictive device comprises an oscillator adapted to provide electrical energy including a current and a voltage signal, a handpiece having a tool tip which vibrates in response to the electrical energy supplied to the handpiece and a control circuit. The control circuit includes a phase detector adapted to detect phase between current and voltage signals and to generate a phase detection signal as a function of the phase. The control circuit also includes a digital signal processor operatively connected to the phase detector. The digital signal processor adapted to process the phase detection signal through a digital loop filter to generate an error signal. The control circuit further includes a voltage controlled oscillator operatively connected to the digital signal processor, wherein the error signal outputs a voltage to operate the voltage controlled oscillator which in response thereto adjusts at least one of frequency and amplitude of vibrations of the tool tip.
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Paschke Noel S.
Paschke Richard
Rose Emery S.
Benson Walter
Carter DeLuca Farrell & Schmidt LLP
Gordon Bryan P
PCG, Inc.
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