Surgery – Means for introducing or removing material from body for... – With means for cutting – scarifying – or vibrating tissue
Reexamination Certificate
2011-04-19
2011-04-19
Casler, Brian (Department: 3737)
Surgery
Means for introducing or removing material from body for...
With means for cutting, scarifying, or vibrating tissue
C601S002000, C606S167000
Reexamination Certificate
active
07927300
ABSTRACT:
In an ultrasonic operation apparatus according to the present invention, in order to detect the initial resonance frequency (Fro) promptly once a foot switch is pressed, under the control of a sweeping speed control circuit, the D/A converter D/A converts 8-bits of signals (phase difference amount signal Δθ) representing the amount of the phase difference detected by the phase comparator, and the output of the D/A converter is output to a VCO so as to become a clock for a sweep circuit. When a phase difference amount between θi and θv is large and a drive frequency setting signal (Fs) is far from Fro, the sweeping speed for Fro detection is increased. When a phase difference amount between θi and θv is small and Fs is close to Fro, the sweeping speed for Pro detection is decreased.
REFERENCES:
patent: 6678621 (2004-01-01), Wiener et al.
patent: 2002-45368 (2002-02-01), None
patent: 2002-177292 (2002-06-01), None
Casler Brian
Mehta Parikha S
Olympus Corporation
Scully , Scott, Murphy & Presser, P.C.
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