Patent ID: 7163538

Claim:
A spinal implant comprising a rigid elongated stabilizer, and a plurality of bone anchor assemblies, said bone anchor assemblies comprising at least one assembly having a post member having a rounded head and fixation member defining an axis and having resilient prongs collectively having an outer convex camming surface and an inner surface which s into a recess which forms a socket about the axis, said socket having an inner area with a spindle and said socket retaining the head of the post member and having a mating interface so that the head is variably positionable within the recess, the at least one assembly further including a locking cap having an inner concave camming surface which forms a mating interface with the outer concave camming surface of the prongs such that the prongs are releasably compressible about the head to lock it into position, and a connector joining the post member to the stabilizer, the head further including a hollow that mates with the spindle whereby the head is biased by the spindle away from the inner area, and wherein the connector includes a slot and the locking cap includes a bushing and the bushing is received in the slot of the connector.