US 12,402,918 B2
Coupling assembly for coupling a rod to a bone anchoring element, polyaxial bone anchoring device and modular stabilization device
Lutz Biedermann, VS-Villingen (DE); Wilfried Matthis, Weisweil (DE); Dimosthenis Dandanopoulos, VS-Schwenningen (DE); and Achim Schünemann, VS-Mühlhausen (DE)
Assigned to BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed by BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed on May 3, 2024, as Appl. No. 18/654,637.
Application 18/654,637 is a continuation of application No. 17/324,524, filed on May 19, 2021, granted, now 12,011,192.
Application 17/324,524 is a continuation of application No. 15/918,762, filed on Mar. 12, 2018, granted, now 11,039,860, issued on Jun. 22, 2021.
Application 15/918,762 is a continuation of application No. 14/490,569, filed on Sep. 18, 2014, granted, now 9,943,338, issued on Apr. 17, 2018.
Claims priority of provisional application 61/879,916, filed on Sep. 19, 2013.
Claims priority of application No. 13185176 (EP), filed on Sep. 19, 2013.
Prior Publication US 2024/0350176 A1, Oct. 24, 2024
Int. Cl. A61B 17/70 (2006.01)
CPC A61B 17/7032 (2013.01) [A61B 17/7002 (2013.01); A61B 17/7035 (2013.01); A61B 17/7037 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A bone anchoring device for coupling a rod to bone, the bone anchoring device comprising:
a bone anchoring element comprising a shank for anchoring to bone and a head;
a receiving part having a first end, a second end below the first end, a central axis extending through the first and second ends, a recess at the first end for receiving the rod, an accommodation space for accommodating the head of the bone anchoring element, and an opening at the second end sized for inserting the head therethrough into the accommodation space;
a rod receiving element separate from and movable in the receiving part, the rod receiving element comprising a rod engagement surface configured to extend into the recess of the receiving part to engage the rod;
a seat portion separate from the receiving part and the rod receiving element, wherein the seat portion is positionable in the accommodation space and comprises an upwardly facing surface configured to directly engage and exert an upward pressure directed towards the first end of the receiving part on the head; and
a spring portion separate from the receiving part and the rod receiving element, the spring portion comprising an engagement surface, wherein at least part of the spring portion is configured to be positioned at an axial position that is lower than the entire rod receiving element in the receiving part;
wherein when the bone anchoring device is at an insertion position, the seat portion is expandable while a position of the entire spring portion remains constant to facilitate passing of the head upwardly past the seat portion when the head is inserted through the opening of the receiving part; and
wherein the bone anchoring device is adjustable from the insertion position to a pre-locking position where the seat portion is restricted from expanding to prevent the head from being removed through the opening of the receiving part, while the engagement surface of the spring portion engages a corresponding surface of the receiving part to restrict adjustment of the bone anchoring device back towards the insertion position.