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 |
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.
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