Connectors for a secondary bone anchor

A spinal fixation system comprising:

• a plurality of spinal rods,
• a plurality of primary bone anchor assemblies for connecting one of the spinal rods to bone, the primary bone anchor assemblies each including a proximal receiver member for receiving a spinal rod, a distal bone anchor for engaging bone, and a closure mechanism for fixing the spinal rod relative to the receiver member,
• a secondary bone anchor, and
• a connector for connecting the secondary bone anchor to one of the primary bone anchor assemblies, the connector including
• a first component engageable to the receiver member of one of the first bone anchor assemblies, the first component being rotatably adjustable relative to the receiver member wherein securing the closure mechanism to the receiver member fixes the rotational position of the first component relative to the receiver member,
• a second component connected to the first component and forming a socket to receive the secondary bone anchor in a plurality of angular orientations, and
• a second closure mechanism engageable with the second component to fix the secondary bone anchor at a selected angular orientation relative to the second component.

A spinal fixation system comprising:

• a plurality of spinal rods,
• a plurality of primary bone anchor assemblies for connecting one of the spinal rods to bone, the primary bone anchor assemblies each including a bone anchor, a proximal receiver member for receiving a spinal rod to be coupled to the bone anchor, and a closure mechanism, the bone anchor having a proximal head and a distal shaft configured to engage bone, the receiver member having a proximal end having a pair of spaced apart arms defining a recess therebetween, a distal end having a distal end surface defining opening through which at least a portion of the bone anchor extends, and the closure mechanism positionable between and engaging the arms to capture a spinal rod within the receiver member and fix the spinal rod with respect to the receiver member,
• a secondary bone anchor having a proximal head and a bone engaging distal shaft, and
• a connector for connecting the secondary bone anchor to one of the primary bone anchor assemblies, the connector including
• a ring having an annular side wall having an inner diameter sized to permit positioning of the side wall about a portion of a receiver member of one of the bone anchor assemblies, the ring being rotatably adjustable relative to the receiver member, wherein securing a closure mechanism to the receiver member fixes the rotational position of the ring relative to the receiver member,
• a socket connected to the ring, the socket having an internal seat configured to engage the proximal head of the secondary bone anchor and to permit pivoting of the distal shaft of the secondary bone anchor in a plurality of angular orientations, and
• a second closure mechanism engageable with the socket to fix the distal shaft of the secondary bone anchor at a selected angular orientation relative to the socket.