Patent ID: 8277493

Claim:
A bone fixation system, comprising: a plate with a first opening having a first opening perimeter and a second opening having a second opening perimeter, said plate having a top surface and a bottom surface; a first fastener in said first opening having a first shank with a first threaded portion, a first head and a first shank perimeter substantially corresponding to said first opening perimeter, wherein said first shank perimeter has a first diameter that extends from said first threaded portion of said first fastener to a spherical surface of said first head of said first fastener, said first shank perimeter contacting said first opening perimeter to fix an angle of said first fastener relative to said bottom surface of said plate; a second fastener in said second opening having a second shank with a second threaded portion, a second head and a second shank perimeter substantially smaller than said second opening perimeter, wherein said second shank perimeter has a second diameter that extends from said second threaded portion of said second fastener to a spherical surface of said second head of said second fastener; and a lock system including a concentric locking recess disposed in between the first opening and the second opening, wherein the first opening and the second opening contact the locking recess at a locking overlap, and a notch extends transversely across the locking recess.