Electrosurgical device with drum-driven articulation

A surgical device for operating on tissue comprises an end effector, a shaft, and an interface assembly. The shaft comprises an articulation section operable to provide deflection of the end effector relative to the longitudinal axis of the shaft. The interface assembly comprises a plurality of pulleys associated with drive shafts driven by an external system. The pulleys are operable to cause rotation of one or both of the shaft or end effector. The pulleys are further operable to cause articulation of the articulation section. The interface assembly further comprises drive components operable to cause movement of components of the end effector.