US 11,771,478 B2
Instrument for locking and unlocking a head of a bone anchor in a polyaxial bone anchoring device
Timo Biedermann, Trossingen (DE); Kevin Dold, Horb am Neckar (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 Jun. 25, 2021, as Appl. No. 17/359,045.
Application 17/359,045 is a continuation of application No. 16/571,858, filed on Sep. 16, 2019, granted, now 11,076,895.
Application 16/571,858 is a continuation of application No. 15/669,604, filed on Aug. 4, 2017, granted, now 10,470,805, issued on Nov. 12, 2019.
Claims priority of provisional application 62/379,108, filed on Aug. 24, 2016.
Claims priority of application No. 16185546 (EP), filed on Aug. 24, 2016.
Prior Publication US 2021/0393299 A1, Dec. 23, 2021
Int. Cl. A61B 17/70 (2006.01)
CPC A61B 17/7083 (2013.01) [A61B 17/708 (2013.01); A61B 17/7032 (2013.01); A61B 17/7037 (2013.01); A61B 17/7076 (2013.01); A61B 17/7079 (2013.01); A61B 17/7082 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An instrument for locking and unlocking a head of a bone anchor relative to a receiving part of a polyaxial bone anchoring device, the instrument comprising:
a tube assembly having a longitudinal axis and comprising an inner portion and an outer portion, the inner portion being displaceable relative to the outer portion to assume a first axial position configured to unlock the bone anchoring device such that the head is pivotable relative to the receiving part, and a second axial position configured to lock the head relative to the receiving part; and
an actuator assembly comprising a first abutment part, a second abutment part, and an actuator adjustable to displace the first abutment part and the second abutment part away from one another,
wherein, when the actuator assembly is at a first orientation relative to the tube assembly, the inner portion is configured to assume the first axial position relative to the outer portion when the first and second abutment parts are displaced away from one another, and when the actuator assembly is at a second orientation relative to the tube assembly, the inner portion is configured to assume the second axial position relative to the outer portion when the first and second abutment parts are displaced away from one another.