Method for detecting presence of a blade in an ultrasonic system
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United States of America Patent
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-
Dec 9, 2003
Grant Date -
Apr 25, 2002
app pub date -
May 29, 2001
filing date -
Oct 20, 2000
priority date (Note) -
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Abstract
The type of blade installed in a hand piece of an ultrasonic system is determined and the information used to adjust the fault detection threshold of the generator by using an impedance diagram to determine the type of blade which is connected to the hand piece. A check is performed to determine the magnitude of the blade impedance at resonance. If the hand piece is bare (i.e. no blade is attached), the magnitude of the impedance at resonance is typically less than 125 ohms. If on the other hand, a blade is connected, the impedance will be greater that 125 ohms. This value is used to indicated the presence or absence of a blade.
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