US 12,114,898 B2
Modular head assembly for spinal fixation
Larry E. McClintock, Gore, VA (US); and Michael Barrus, Redondo Beach, CA (US)
Assigned to K2M, Inc., Leesburg, VA (US)
Filed by K2M, Inc., Leesburg, VA (US)
Filed on Dec. 23, 2021, as Appl. No. 17/560,471.
Application 17/560,471 is a continuation in part of application No. PCT/US2021/059376, filed on Nov. 15, 2021.
Claims priority of provisional application 63/115,737, filed on Nov. 19, 2020.
Prior Publication US 2023/0270472 A1, Aug. 31, 2023
Int. Cl. A61B 17/70 (2006.01)
CPC A61B 17/7038 (2013.01) [A61B 17/7037 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A pedicle screw assembly, comprising:
a bone screw having a head and a shank, the head defining at least one groove; and
a modular head assembly comprising:
a housing having a proximal end and a distal end, the housing defining a throughbore extending along a longitudinal axis of the housing and between the proximal and distal ends of the housing;
an anvil disposed within the throughbore such that the anvil is translatable along the axis and inhibited from rotating relative to the longitudinal axis; and
a spring at least partially circumscribing an outer surface of the anvil and entirely disposed within the throughbore.