Patent ID: 7588575

Claim:
A surgical system comprising: a bone anchor comprising: a head, wherein the head includes at least one circumferential key; and a first torqueing surface disposed on the at least one circumferential key; and an extension for use in the surgical system, the extension comprising: an elongated structure having a central bore, the elongated structure having a proximal portion and a distal portion; and a longitudinal passage; an actuating ring disposed around the central bore, wherein the actuating ring has a helical slot disposed within the actuating ring; a slider slideably coupled to the longitudinal passage and coupled to the actuating ring wherein the slider is selectively positionable between a first position and a second position; at least one interior channel disposed on the interior surface of the central bore at the distal portion adapted to mate with the circumferential key, where the at least one interior channel has a second torquing surface for transmitting torque to the bone anchor head; and a proximal head portion coupled to the actuating ring wherein the proximal head portion has a plurality of torque flats adapted to couple to a torque transmission instrument.