CPC A61B 17/7032 (2013.01) [A61B 17/708 (2013.01); A61B 17/7037 (2013.01); A61B 17/7076 (2013.01); A61B 17/7083 (2013.01); A61B 17/7085 (2013.01)] | 20 Claims |
1. A bone anchoring device comprising:
a bone anchoring element comprising a shank for anchoring to bone and a head;
a receiving part for coupling a rod to the bone anchoring element, the receiving part comprising a first end, a second end, a central axis extending between the first end and the second end, a recess at the first end for receiving the rod, the recess forming two legs each having an inner surface for engaging a fixation element to fix the rod in the recess, and a head receiving portion at the second end for pivotably holding the head of the bone anchoring element; and
a clamping ring positionable around the head receiving portion and movable axially while maintaining a constant rotational orientation from a first position where the head is insertable into the head receiving portion and is pivotable relative to the receiving part to a second position where the clamping ring exerts a force on the head receiving portion to clamp the head relative to the receiving part while the recess for the rod remains sufficiently unobstructed for the rod to extend and move therethrough, and from the second position back to the first position where the head is pivotable relative to the receiving part but is prevented from being removed from the head receiving portion;
wherein when the clamping ring is at the second position, the clamping ring is spaced apart axially from the recess for the rod, such that an inserted rod is restricted from contacting the clamping ring.
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