Surgery – Instruments – Cutting – puncturing or piercing
Reexamination Certificate
2007-02-20
2007-02-20
Hayes, Michael J. (Department: 3734)
Surgery
Instruments
Cutting, puncturing or piercing
C606S001000, C702S106000
Reexamination Certificate
active
10326223
ABSTRACT:
The ability of an ultrasonic system to sweep and lock onto a resonance frequency of a blade subjected to a heavy load at startup is improved by applying a high drive voltage or a high drive current while systematically increasing the level of the applied signal. Increasing the drive signal to the hand piece results in an improved and more pronounced “impedance spectrum.” That is, under load, the increased drive signal causes the maximum phase margin to become higher and the minimum/maximum impedance magnitude to become more pronounced. Increasing the excitation drive signal to the hand piece/blade at startup significantly alleviates the limiting factors associated with ultrasonic generators, which results in an increase of the maximum load capability at startup.
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EPO Communication dated Jul. 28, 2005 for corresponding patent application, European Patent Application No. EP 01 308 910.
Brotz Joseph A.
Donofrio William T.
Friedman Allan L.
Hein John E.
Wiener Eitan T.
Ethicon Endo-Surgery, Inc
Hayes Michael J.
Nguyen Victor X.
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