Patent ID: 11944353
Assignee: JGMG BENGOCHEA, LLC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 8:
9. A pivoting screw assembly for surgical implantation, comprising:
a fixation screw, including:
a threaded shank, and a head having a concave curved cradle that is shaped and disposed to receive and support a cylindrical stabilization rod, and a tapered surface that is adjacent to the threaded shank, the tapered surface including a linear taper, a curved taper, or a combination thereof, wherein the screw head further includes a plurality of contoured surfaces sloping away from the cradle toward the tapered surface, the plurality of contoured surfaces adapted to support the cylindrical stabilization rod and including contours selected from the group consisting of bevels, chamfers, curves, and combinations thereof;

a receiver body adapted for engagement with the fixation screw having an aperture having a generally U-shaped conformation, and including
a base that includes a curved exterior surface, an interior surface having a through slot for receiving the shank and a seat with a curved surface for contacting the tapered surface of the fixation screw; and
opposing sidewalls extending from the base, the opposing sidewalls including interior and exterior surfaces, and including on the interior surfaces opposing flats adjacent to the base and a threaded portion proximal to the flats; and

wherein the base and the opposing sidewalls are shaped and disposed to receive the spinal stabilization rod in contact with the cradle of the screw head inserted in the through slot,
wherein the curved exterior surface of the base and the curved surface of the seat of the base include an essentially common curvature, and
wherein, as assembled, the curved exterior surface of the base, and the curved surface of the seat of the base, restrict rotation of the receiver body to a single axis of rotation aligned with the essentially common curvature and wherein the opposing flats limit the extent of pivotal movement of the receiver body.