Patent ID: 8298275
Filing Date: 2012-10-30
Classification: A61B

Abstract:
1. A bone anchor assembly, comprising: a receiver extending along a central longitudinal axis between a proximal end and an opposite distal end, said receiver including a distal portion defining a receptacle opening at said distal end and a pair of arms extending from said distal portion along said central longitudinal axis on opposite sides of a passage, wherein a lower outside surface of said receiver includes a pair of bosses spaced apart from one another on opposite sides of said receiver, said bosses protruding outwardly from said lower outside surface and extending parallel to one another; a base cap including an upper surface extending to a lower surface, said upper and lower surfaces being parallel to one another, said lower surface including an inner surface defining a generally rectangular shaped second passage opening into an interior recessed surface in relation to said upper surface, wherein said base cap further includes a lip extending inwardly from said inner surface toward said upper surface and a central axis of said bone cap that defines a passageway between said lip and said interior recessed surface, wherein said lip includes a pair of spaced apart recessed portions in communication with said passageway configured for disposal of said bosses, the base cap being configured to be connected with a second lower surface of said receiver such that said bosses are positioned in said recessed portions, wherein said interior recessed surface includes a head tray; and a bone anchor including a distal bone engaging portion and a head at a proximal end of said distal bone engaging portion, said head comprising a generally circular shape extending outwardly and horizontally in relation to said bone engaging portion, said head being configured to be received in said base cap through said second passage when said head is positioned in a first orientation and when said bone anchor is rotated to a second orientation said head is configured to pivotally rest in said head tray.