US Patent 11026723 Pedicle screw assemblies with 3D printed components

A bone fastener assembly including a bone screw, a receiver, a crown, a first retaining ring, and a second retaining ring is provided. The crown is received in an interior cavity of the receiver, and the first retaining ring is provided to hold the crown in the receiver. At least a portion of a head portion is received in the interior cavity of the receiver, and the second retaining ring is provided to hold at least a portion of the head portion in the receiver. The crown, the first retaining ring, and/or the second retaining ring can be manufactured using a 3D printing process that provides a higher surface finish (Ra).