| 摘要 |
<p>In one embodiment, a spinal fixation assembly (10) includes an elongated member (R) configured for placement adjacent the spine and a bone engaging fastener (11) having a lower portion (15) configured for engaging a vertebra and a head (16) that is at least partially spherical. The assembly further includes a receiver member (12) defining a bore (25) therethrough a recess (27) for receiving the head (16) of the bone engaging (11) fastener therein, and a lower opening at the bottom end of the receiver member through which the bone screw extends. The recess (27) is configured to permit pivoting of the bone screw within the receiver member until the heat is fixed within the recess. The receiver member (12) also includes a channel (33) communicating with the bore and having an upper opening (35) at the top end of the receiver member for insertion of the spinal rod into the channel. In one embodiment, two compression members (13) are provided, each being formed of a temperature responsive material to contract about a portion of the receiver member to thereby compress the receiver member about both the head of the bone screw and the spinal rod.</p> |
