Surgery – Instruments – Cutting – puncturing or piercing
Reexamination Certificate
2006-07-18
2006-07-18
Woo, Julian W. (Department: 3731)
Surgery
Instruments
Cutting, puncturing or piercing
C702S075000
Reexamination Certificate
active
07077853
ABSTRACT:
A method for calculating the capacitance of a transducer (C0) without knowing the exact resonance frequency of a transducer/blade combination is achieved by sweeping across a broad frequency range which contains resonant and non-resonant frequencies where C0can be measured. A pre-defined frequency range is set independently of the resonance frequency of a specific transducer/blade combination. C0of the transducer/blade is measured at several different frequencies within the pre-defined frequency range to ensure that invalid C0measurements are disregarded, and the temperature of the transducer is calculated based on valid C0measurements. The determined transducer temperature, based on C0measurements, can be used to optimize performance and/or provide a safety shutdown mechanism for the generator.
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Donofrio William T.
Houser Kevin
Kramer Kenneth S.
Stulen Foster B.
Wiener Eitan T.
Ethicon Endo-Surgery Inc.
Kreger, Jr. Verne E.
Nguyen Victor X.
Woo Julian W.
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