US 12,167,876 B2
Bone fastener tower assembly for spinal surgery
Douglas Brooke, Golden, CO (US); Heidi Farmer, Superior, CO (US); Guillaume Quetier, Lakewood, CO (US); and James Vincent Eaton, Denver, CO (US)
Assigned to Zimmer Biomet Spine, Inc., Westminster, CO (US)
Filed by Zimmer Biomet Spine, Inc., Westminster, CO (US)
Filed on Aug. 12, 2022, as Appl. No. 17/886,833.
Claims priority of provisional application 63/233,046, filed on Aug. 13, 2021.
Prior Publication US 2023/0049503 A1, Feb. 16, 2023
Int. Cl. A61B 17/70 (2006.01)
CPC A61B 17/7086 (2013.01) [A61B 17/708 (2013.01); A61B 17/7085 (2013.01); A61B 17/7052 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An extender tower configured to couple to a bone anchor, the extender tower comprising:
an outer tower body extending along a longitudinal axis from a proximal portion to a distal portion, the tower body comprising:
first and second deflectable arms at the distal portion configured to engage with a housing of a bone anchor;
first and second ramp-locks located on the first and second deflectable arms, respectively;
a threaded portion located at the proximal portion;
first and second deflectable prongs extending alongside the first deflectable arm; and
third and fourth deflectable prongs extending alongside the second deflectable arm;
a cap configured to engage the threaded portion;
a first inner slide comprising a first coupling portion configured to engage the cap and a first window configured to engage the first ramp-lock; and
a second inner slide comprising a second coupling portion configured to engage the cap and a second window configured to engage the second ramp-lock;
wherein the cap can be rotated to:
move the first and second inner slides to engage the first and second ramp-locks to push the first and second deflectable arms outward; and
move the first and second inner slides to engage the first and second ramp-locks to prevent outward movement of the first and second deflectable arms.