06325799 is referenced by 548 patents and cites 37 patents.

In an electrosurgical instrument susceptible to varying load impedance, particularly varying load reactance, a fixed frequency radio frequency generator has an output stage (Q

1,

Q

2,

TR

2

-TR

4,

C

1,

VC

2, 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 (VC

2

) which maintains the tuning of the network substantially constant. Variation of the capacitor (VC

2

) 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.

Title
Electrosurgical instrument
Application Number
9/403389
Publication Number
6325799 (B1)
Application Date
December 20, 1999
Publication Date
December 4, 2001
Inventor
Colin C O Goble
Wales
US
Agent
Nixon & Vanderhye P C
US
Assignee
Gyrus Medical
US
IPC
A61B 18/18
View Original Source