Patent ID: 8377100

Claim:
A closure plug in combination with an open-headed medical implant having a pair of spaced arms with a discontinuous, helically wound interior guide and advancement structure thereon; said plug comprising: a) a body sized and shaped to be received between the arms of the implant; said body having a radially outward surface that has a mating guide and advancement structure thereon that is sized and shaped to rotatably mate with the interior guide and advancement structure of the arms of the implant; b) said body having a top surface and a bottom surface; said top surface of said body having at least one removal aperture therein sized and shaped to receive a removal tool; said aperture extending axially from the bottom surface to the top surface of said body and opening onto the top surface thereof; c) said aperture being spaced from and positioned between both a central axis of said body and a periphery of said body; and d) a break-off head breakably and axially joined to said body and adapted to receive an installation tool for operably rotating said body; said head being joined to said body by a torque limiting region that causes said head to break from the body, when a preselected torque is applied to said head; said break-off head being free of pass through openings that axially align with said apertures so as to operably block axial access to said aperture from above said break-off head by the removal tool until said break-off head breaks from said body.