Surgical instrument for treating tissue

An electrosurgical instrument, comprising:

• a housing;
• an elongated shaft extending from the housing and defining a longitudinal axis;
• a pair of jaw members disposed at a distal portion of the elongated shaft, wherein at least one of the jaw members of the pair of jaw members is movable relative to the other jaw member of the pair of jaw members;
• a knife configured to cut tissue disposed between the pair of jaw members;
• and
• a knife collar housing a proximal portion of the knife and configured to move along the longitudinal axis relative to the elongated shaft, wherein the proximal portion of the knife is rotatable relative to the knife collar and longitudinal movement of the knife collar along the longitudinal axis induces corresponding longitudinal movement of the knife.

An electrosurgical instrument, comprising:

• a housing;
• an elongated shaft extending from the housing and defining a longitudinal axis;
• a pair of jaw members disposed at a distal portion of the elongated shaft, wherein at least one of the jaw members of the pair of jaw members is movable relative to the other jaw member of the pair of jaw members;
• a knife configured to cut tissue disposed between the pair of jaw members;
• a pin extending through the knife;
• and
• a knife collar configured to move the knife along the longitudinal axis relative to the elongated shaft, the knife collar defining an interior channel for receiving the pin, wherein the pin is rotatable within the interior channel during rotation of the knife about the longitudinal axis and relative to the knife collar.