US 12,458,421 B2
Screw-in-screw bone fixation system
Steven Greco, West Chester, PA (US); Seung Kyu Daniel Kwak, Wayne, PA (US); Timothy Josephson, Greenlawn, NY (US); Philip Watt, New Holland, PA (US); and Jeffrey Loftus-Vergari, Media, PA (US)
Assigned to DePuy Synthes Products, Inc., Raynham, MA (US)
Filed by DePuy Synthes Products, Inc., Raynham, MA (US)
Filed on Dec. 18, 2020, as Appl. No. 17/126,199.
Prior Publication US 2022/0192720 A1, Jun. 23, 2022
Int. Cl. A61B 17/86 (2006.01)
CPC A61B 17/864 (2013.01) [A61B 17/8605 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A bone fixation system configured to anchor to bone, the bone fixation system comprising:
a bone anchor including:
a head that defines a threaded head bore extending through the head along a head bore axis; and
a fully threaded shaft extending from the head along a shaft axis and configured to be driven into bone,
wherein the bone anchor defines a threaded shaft bore, and an entirety of the shaft bore extends through the shaft along a shaft bore axis that is angularly offset with respect to the shaft axis;
an auxiliary shaft anchor sized to be inserted through the shaft bore of the bone anchor along the shaft bore axis and driven into bone, the auxiliary shaft anchor having a respective head that is configured to threadedly mate with the bone anchor in the shaft bore; and
an auxiliary head anchor sized to be inserted through the head bore of the bone anchor along the head bore axis so as to be driven into bone, the auxiliary head anchor having a respective head that is configured to threadedly mate with the bone anchor in the head bore.