US 12,011,192 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 19, 2021, as Appl. No. 17/324,524.
Application 17/324,524 is a continuation of application No. 15/918,762, filed on Mar. 12, 2018, granted, now 11,039,860.
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 2021/0338287 A1, Nov. 4, 2021
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)] 26 Claims
OG exemplary drawing
 
1. A coupling assembly for coupling a rod to a bone anchoring element, the coupling assembly comprising:
a receiving part having a first end, a second end below the first end, and a central axis extending through the first and second ends, a recess at the first end for receiving the rod, and an accommodation space for accommodating a head of the bone anchoring element, the accommodation space having an opening at the second end for inserting the head; and
a pressure element positionable at least partially in the accommodation space to exert pressure on the head, wherein the pressure element comprises at least one spring portion which extends circumferentially around the central axis from a first end that is connected axially to another portion of the pressure element to a free second end that is spaced apart axially from and resiliently movable relative to other portions of the pressure element, wherein at least the second end of the spring portion is configured to engage a downwardly facing engagement surface at an inner wall of the receiving part to restrict axial movement of the pressure element towards the first end of the receiving part.