Surgical forceps

A surgical instrument, comprising:

• a housing;
• a handle pivotably connected to the housing;
• an elongated shaft extending distally from the housing and defining a longitudinal axis;
• an end effector assembly disposed adjacent a distal end of the elongated shaft, the end effector assembly including a first jaw member and a second jaw member, at least one of the jaw members movable with respect to the other jaw member from a spaced-apart position to a position closer to the other jaw member for grasping tissue;
• a drive assembly disposed at least partially within the housing, the drive assembly including a drive bar extending at least partially through the elongated shaft such that longitudinal translation of the drive bar causes the jaw members to move between the spaced-apart position and the closer position for grasping tissue;
• a support mechanically coupled to the housing;
• a roller rotationally supported by the support;
• and
• an extension depending from the handle, the extension including a proximal surface and a channel defined therein, the proximal surface configured to contact a portion of the drive assembly such that movement of the handle with respect to the housing causes longitudinal translation of the drive bar, the channel positioned for mechanical engagement by the roller.