Electrosurgical instrument
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United States of America Patent
Stats
-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Dec 20, 1999
filing date -
Apr 24, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electrosurgical instrument susceptible to varying load impedance, particularly varying load reactance, a fixed frequency radio frequency generator has an output stage (Q1, Q2, TR2-TR4, C1, VC2, 42) consisting of at least one output power device and, coupled to the power device, an output network with a load-dependent resonant condition. To compensate for variations in the load reactance, the output network has a dynamically variable capacitor (VC2) which maintains the tuning of the network substantially constant. Variation of the capacitor (VC2) is performed by means of a phase comparator and servo device (44) which are responsive to variations in phase difference occurring in the output stage due to load reactance changes.
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