Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2005-05-24
2005-05-24
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S072000, C702S074000, C702S151000, C702S171000
Reexamination Certificate
active
06898536
ABSTRACT:
The start up performance of an ultrasonic system under zero load conditions is improved by setting a phase set point in a frequency control loop such that, at start up under zero load conditions, the phase set point intersects a point on a phase-frequency response curve which has a low positive slope. This intersection point on the phase-frequency response curve changes as the load is increased and the system Q is decreased. The controller “seeks” a target 0° impedance phase angle. The frequency of the ultrasonic generator is set to an off-resonance frequency which is lower than the resonance of any known hand piece/blade combination. In order for the drive voltage to not exceed the physical limit of the system, the drive current is set to a low level. The drive frequency is then smoothly increased in steps until the target 0° impedance phase delta is located.
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EPO Search Report dated Feb. 16, 2004 for corresponding patent application, European Patent Application No. EP 01 30 8928.
Brotz Joseph A.
Hein John E.
Wiener Eitan T.
Darby & Darby
Etchicon Endo-Surgery, Inc.
Hoff Marc S.
Suarez Felix
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