Patent ID: 8435258

Claim:
A torque wrench for coupling an ultrasonic surgical instrument to an ultrasonic transducer, the torque wrench comprising: a torque receiving element defining a central axis, the torque receiving element comprising two or more of gears arranged about the central axis, each gear comprising a ramp portion and a flat portion; a body comprising a cantilever arm arranged annularly about the gears, the cantilever arm adapted to engage the ramp portions of the gears when the body is rotated in a first rotational direction about the central axis causing the cantilever arm to flex away from the central axis thereby imparting to the torque receiving element a limited torque sufficient to operatively couple an ultrasonic surgical instrument to an ultrasonic transducer, and the cantilever arm engaging the flat portions of the gears when the body is rotated in a second rotational direction about the central axis.