Abstract: An electrosurgical forceps includes a first member including a first housing and a first jaw member with a tissue contacting surface. A second member includes a second jaw member with a tissue contacting surface configured to communicate electrosurgical energy with the tissue contacting surface of the first jaw member a fluid receptacle at least partially disposed within the first housing. The fluid receptacle defines first and second receptacle sections, the first receptacle section defining a first internal dimension and the second receptacle section defining a second internal dimension less than the first internal dimension. A fluid is disposed within the fluid receptacle. A trigger plunger is mounted within the fluid receptacle. A knife shaft is at least partially disposed within the fluid receptacle distal of the trigger plunger and the fluid. A knife blade is disposed adjacent the first and second jaw members.

Abstract: An electrosurgical forceps includes a hydraulic knife mechanism adapted to increase linear movement of the cutting blade while minimizing movement of the manually manipulative actuator or trigger.