Abstract: A surgical instrument, comprising a motor drive unit comprising a motor drive unit; a rotary surgical end effector arranged to be coupled to the motor drive unit; and a coupling means for coupling the motor drive unit and the rotary surgical end effector, the coupling means being configured such that there is only one possible rotational alignment between the rotary surgical end effector and the motor drive unit when coupled. This arrangement guarantees the rotational position of the rotary surgical end effector in relation to the rotational position of the motor drive unit. This enables quick and easy control of the rotational position of the rotary surgical end effector.

Abstract: The present disclosure provides an electrode assembly wherein an electrically conductive material is configured to extend into an insulating moulding via an opening in a wall of said moulding to electrically contact an active tip placed into the insulating moulding and thereby retain the active electrode therein, such that the height and space required to anchor the active electrode within the moulding is greatly reduced while still providing the necessary retention strength and electrical connection. As such, the electrode assembly retains and connects the active tip with a conductive element that is mounted within the insulating moulding.