US 11,690,652 B1
Modular screw assembly
John Franklin Cummins, Kosciusko, MS (US); and John Lawrence Walker, Madison, MS (US)
Assigned to ZAVATION MEDICAL PRODUCTS LLC, Flowood, MS (US)
Filed by Zavation Medical Products, LLC, Flowood, MS (US)
Filed on Aug. 17, 2022, as Appl. No. 17/889,977.
Int. Cl. A61B 17/70 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/7032 (2013.01) [A61B 17/7037 (2013.01); A61B 2017/00862 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A modular screw assembly for use in stabilizing a spinal column, comprising:
a fastener which couples to a screw head of a bone anchor;
a screw head coupler;
a retaining ring; and
a friction ring,
wherein
the fastener houses the screw head coupler, the retaining ring, and the friction ring,
translation of the fastener past the screw head results in the retaining ring elastically deforming and then snapping around the screw head, and
the friction ring mates to an outer wall of the retaining ring such that, upon the translation, the retaining ring slides along an inner surface of the friction ring.