Patent ID: 9414865
Filing Date: 2016-08-16
CPC Classification: A61B

Claim Text:
1. A bone fixation implant assembly, comprising: a fastener having a partially spherical fastener head having a head diameter and a shaft extending along a longitudinal axis; and an eccentrically shaped monolithic cap comprising: a first axis intersects an outer edge of the first lobe, an outer edge of the second lobe, and the aperture geometric center, the first axis defining an axis of maximum length of the cap, a second axis intersects the first axis at the aperture geometric center and extends perpendicular to the first axis, and the aperture defines an aperture axis perpendicular to the first and second axes; the first lobe of the eccentrically shaped cap is longer, when measured from the aperture geometric center to the outer edge of the first lobe along the first axis, than the second lobe of the eccentrically shaped cap, when measured from the aperture geometric center to the outer edge of the second lobe along the first axis; the first lobe of the eccentrically shaped cap comprises at least one width, wherein the at least one width is larger, when measured in the direction of the second axis perpendicular to the first axis, than a largest width of the second lobe, when measured in the direction of the second axis perpendicular to the first axis; the cap comprises a bone engaging side, each of the first and second lobes comprises a planar bone engaging surface on the bone engaging side and an upper surface opposite the planar bone engaging surface, wherein the planar bone engaging surface of the first lobe abuts and is coplanar with the planar bone engaging surface of the second lobe, providing a uniplanar surface on the bone engaging side of the cap, the uniplanar surface extending between the outer edges of the first and second lobes; the spherically shaped capsule is contained entirely between the uniplanar bone engaging surface of the cap and the upper surface of the cap; and a plurality of teeth projecting from the first and second lobes on the bone engaging side continuous with the outer edges of the first and second lobes, said plurality of teeth configured to pierce into bone, the plurality of teeth comprising beveled surfaces which oppose one another and at least partially diverge away from each other moving away from the bone engaging side of the cap toward free ends of the teeth, and an additional tooth projecting from the planar bone engaging surface of the first lobe between one of the plurality of teeth and the aperture.