Patent ID: 8016866

Claim:
A tulip housing member comprising: a body member; said body member having a rod-reception channel and a rod seat both of which are adapted to receive a rod, said body member comprising at least one engagement surface in communication with said rod-reception channel, said rod-reception channel having a portion that extends axially and a second portion that extends about an axis of said body member; said at least one engagement surface configured to selectively fix said rod in the tulip housing member via rotation of said body member; said body member being adapted to receive at least one inner member configured to have a rotational relationship with said body member to fix said body member to a head of a bone fixation device; and wherein during said rotation of at least one of said body member or said at least one inner 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; wherein said second portion extends in a curve about said axis.