Patent ID: 7604655

Claim:
A tulip assembly configured to be coupled to a head of a bone fixation device comprising: at least one inner member configured to fix said tulip assembly to said head of said bone fixation device; and an outer member including at least one engagement surface configured to selectively fix a rod in the tulip assembly via rotation of said outer member after said rod is received in said outer member; wherein said outer member comprises a rod receiving channel for receiving said rod and a rod locking channel having a rod seat, said rod receiving channel being in communication with said rod locking channel; said at least one engagement surface defining a wall of at least one of said rod receiving channel or said rod locking channel, said at least one engagement surface engaging said rod and forcing said rod to move axially in said outer member and toward said rod seat upon rotation of said outer member; said outer member having an end from which a threaded portion of said bone fixation device extends and a rod receiving end; said rod receiving channel having a rod receiving opening through said rod receiving end, said rod receiving opening receiving said rod after said at least one inner member is received in said outer member, said rod becoming fixed in said outer member after said rotation of said outer member.