US 12,251,147 B2
Polyaxial bone anchoring device with enlarged pivot angle
Lutz Biedermann, VS-Villingen (DE); and Martin Meer, Vöhringen (DE)
Assigned to BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed by BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed on Jun. 24, 2022, as Appl. No. 17/848,692.
Application 17/848,692 is a continuation of application No. 16/905,312, filed on Jun. 18, 2020, granted, now 11,389,219.
Application 16/905,312 is a continuation of application No. 15/962,763, filed on Apr. 25, 2018, granted, now 10,729,483, issued on Aug. 4, 2020.
Application 15/962,763 is a continuation of application No. 14/575,827, filed on Dec. 18, 2014, granted, now 9,962,207, issued on May 8, 2018.
Claims priority of provisional application 61/919,566, filed on Dec. 20, 2013.
Claims priority of application No. 13 198 637 (EP), filed on Dec. 19, 2013.
Prior Publication US 2022/0395307 A1, Dec. 15, 2022
Int. Cl. A61B 17/86 (2006.01); A61B 17/70 (2006.01)
CPC A61B 17/8605 (2013.01) [A61B 17/7037 (2013.01); A61B 17/7001 (2013.01); A61B 17/7002 (2013.01); A61B 17/7008 (2013.01); A61B 17/7032 (2013.01); A61B 17/7035 (2013.01); A61B 17/7062 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A polyaxial bone anchoring device comprising:
an anchoring element having a shank configured to anchor in bone and a head;
a receiving part configured to be pivotably connected to the head, the receiving part having a first end and a second end below the first end, a central axis extending through the first end and the second end, a channel at the first end that is transverse to the central axis for receiving a rod, and an accommodation space at the second end for accommodating the head;
an insert piece configured to be positioned around and to contact at least a portion of the head in the receiving part, the insert piece comprising a free end configured to be positioned closest to the first end of the receiving part, and an inner wall with a first portion that extends from the free end and a second portion farther away from the free end that is directly connected to the first portion and spaced apart at least as much from a central axis of the insert piece as the first portion is from the central axis of the insert piece; and
a pressure member positionable at least partially in the accommodation space and configured to directly contact the rod and to directly contact the head to exert pressure on the head to lock the head relative to the receiving part;
wherein when the head, the insert piece, and the pressure member are in the receiving part, the entire first portion and the entire second portion of the inner wall of the insert piece are configured to remain spaced apart from the head, the insert piece is pivotable together with the receiving part relative to the head, and at least the free end of the insert piece is movable towards the central axis of the receiving part while a portion of the pressure member is positionable radially between the free end of the insert piece and the head to limit the movement of the free end of the insert piece towards the central axis of the receiving part.