Patent ID: 6755829
Filing Date: 2004-06-29
Classification: A61B,Y10S

Abstract:
An anchor assembly for securing a fixation rod, such assembly comprising:a spinal anchor assembly having a screw axis and a head member with a slot and an open distal end adapted for passage of a linking element therethrough and a cap for closing the open end wherein the head member comprises an upwardly extending body having at least a partial flange portion extending about a perimeter of said head member, the partial flange portion of the head member extending internally of the perimeter, and said cap fitting within the head member, and wherein the cap includes a cover having a plurality of spaced apart radially extending rim protrusions adapted for passing through the partial flange portion when the cover is moved along the screw axis and rotating into engagement with the partial flange portion of the head member so as to close the open end and thereby capture the linking member in the slot, said cap further having a centrally-placed clamping member for tightening down to further clamp the captured linking member, wherein the clamping member is a clamping screw that passes centrally through the cap for locking the linking member in position.