Patent ID: 8603145

Claim:
A coaxially lockable poly-axial bone fastener assembly, comprising: a bone fastener having a head, a shank, and a neck between the head and the shank, wherein the neck has a smaller outer diameter than adjacent portions of the head and the shank; a collar having an opening for receiving said bone fastener; and a coaxial locking mechanism for locking said collar and said bone fastener, wherein said coaxial locking mechanism comprises a coaxial lock, wherein said collar further comprises a cavity structured to accommodate said coaxial lock, wherein a portion of said neck of said bone fastener is structured to mate with said coaxial lock, wherein said coaxial lock is positioned in said cavity of said collar and mates with said portion of said neck of said bone fastener, wherein said coaxial locking mechanism prevents poly-axial movements of said collar relative to said bone fastener while permitting coaxial rotation of said collar relative to said bone fastener, wherein prevention of said poly-axial movements allows angular correction forces to be applied to a pedicle to which said shank of said bone fastener is affixed, and wherein permission of said coaxial rotation allows orientation of said collar relative to said shank of said bone fastener for receiving an elongated member without affecting a depth of said shank of said bone fastener in said pedicle.