Patent ID: 9492209
Filing Date: 2016-11-15
CPC Classification: A61B

Claim Text:
1. An extension device for a bone anchor, wherein the bone anchor comprises an anchoring section for anchoring to a bone and a receiving part connected to the anchoring section, the receiving part comprising a central axis and a channel for receiving a rod, the extension device comprising: a first sleeve having a first sleeve axis, wherein the first sleeve is configured to be detachably coupled to the receiving part; a second sleeve configured to contact the receiving part when the second sleeve is positioned in the first sleeve; and a coupling member configured to connect the first sleeve to the second sleeve, wherein when the coupling member is connected to the first sleeve, the entire coupling member is in the first sleeve; wherein the first sleeve is configured to contact the receiving part to restrict translational movement of the first sleeve relative to the receiving part along the central axis, wherein the second sleeve is configured to contact the receiving part to restrict rotational movement of the second sleeve relative to the receiving part, and wherein the coupling member is configured to axially advance in the first sleeve together with the second sleeve along the first sleeve axis.