Patent ID: 7686835

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 a bone fixation device; and an outer member having a rod-reception channel and a rod seat both of which are adapted to receive a rod, said outer member comprising at least one engagement surface in communication with said rod-reception channel, said at least one engagement surface configured to selectively fix said rod in the tulip assembly via rotation of said outer member; wherein said at least one inner member is configured to positionally fix said tulip assembly relative to said head of said bone fixation device in response to movement of said at least one inner member in said outer member and relative to said head and independent of said rotation of said outer member, said rod-reception channel being adapted to receive said rod after said at least one inner member is fixed onto said head, said rod-reception channel having a portion that extends axially and a second portion that extends circumferentially about an axis of said outer member; wherein during said rotation of said outer member, said at least one engagement surface engages said rod and causes said rod to move in said rod-reception channel and locks said rod in said rod seat.