Electrical rotating cutting instruments and systems

An electrical cutting system for use with a rotating cutting instrument, a surgical motor, and a control unit for the surgical motor, the rotating cutting instrument comprising a proximal electrically-conductive shank configured to receive torque, an electrically-conductive outer electrode in electrical contact with the proximal electrically-conductive shank, and an electrically-conductive inner electrode, the electrical cutting system comprising:

• a handpiece configured to be removably coupled to the rotating cutting instrument, the handpiece comprising:
• an external casing comprising a cap;
• and
• a torque transmitter comprising an internal channel sized and shaped to removably receive the proximal electrically-conductive shank of the rotating cutting instrument therein such that a proximal end portion of the rotating cutting instrument extends proximally out of the torque transmitter and a distal end portion of the rotating cutting instrument extends distally out of the torque transmitter, the torque transmitter configured to transmit the torque generated by the surgical motor to the proximal electrically-conductive shank when the rotating cutting instrument is removably coupled to the handpiece;
• a central unit configured to emit signals to and collect signals from the rotating cutting instrument and provide information to a user of the electrical cutting system;
• and
• an electrical connecting system configured to electrically connect the electrically-conductive outer electrode and the electrically-conductive inner electrode to the central unit, the electrical connecting system comprising:
• an outer-electrode electrical connector comprising an outer-electrode electrical contact, and an insulated electrical wire electrically coupled to the outer-electrode electrical contact and to the central unit;
• and
• an inner-electrode electrical connector comprising an inner-electrode electrical contact, and an insulated electrical wire electrically coupled to the inner-electrode electrical contact and to the central unit,
• wherein the handpiece is configured such that when the rotating cutting instrument is removably coupled to the handpiece, the outer-electrode electrical contact is in electrical contact with the electrically-conductive outer electrode, and the inner-electrode electrical contact is in electrical contact with the electrically-conductive inner electrode via the proximal end portion of the rotating cutting instrument extending proximally from the torque transmitter.