Ultrasonic system controls, tool recognition means and feedback methods

摘要

An ultrasonic electro-mechanical resonant system and instrument that provides improvements in the design and implementation of a feedback system. The disclosed configuration and orientation of coils enhance the motional or velocity feedback signals while minimizing the effects of transformer coupling. A two coil and a three coil approach is disclosed that takes advantage of non-homogeneous magnetic fields. An asymmetrical arrangement enables velocity signals to be coupled into the coils without requiring additional signal conditioning or capacitive elements.

主权项

1. An ultrasonic magnetostrictive system, comprising:
an oscillator configured to provide electrical signals including a current signal and a voltage signal; a drive circuit operably coupled to the oscillator and configured to amplify the electrical signals to generate a drive signal; a handpiece operably coupled to the drive circuit and configured to operably engage a removable transducer, the handpiece including:
a drive coil configured to establish an electromagnetic field for driving the transducer; anda feedback configuration, including:
a center coil having n turns wound in a first direction and having a portion of the center coil positioned in the nodal region of the transducer; andat least one distal coil having greater than n turns, wound in a second direction opposite the first direction,wherein the feedback configuration provides frequency and phase information regarding the transducer and minimizes the effect of transformer coupled signals.