Patent ID: 7766944

Claim:
An anchoring element for fastening a rod of a device for adjusting a human or animal vertebral column on a vertebra, said anchoring element having a retaining means ( 10 ) for receiving the rod, a securing element ( 26 ) that is attachable on the retaining means and acting against the rod, a fastening element ( 14 ) for attachment to the vertebral body and a clamping device ( 12 ) which is arranged between the retaining means ( 10 ) and the fastening element ( 14 ), including a ring-shaped mount ( 32 ), a bearing ( 28 ) and an intermediate element ( 30 ) embedded in the mount ( 32 ) and surrounding the bearing, said bearing ( 28 ) having the shape of a spherical segment on two opposing sides ( 34 , 36 ) and comprising two guiding surfaces ( 38 , 40 ) configured to be planar between the sides ( 34 , 36 ) and also being oppositely disposed from each other, and said intermediate element ( 30 ) being substantially configured to be annular and comprising in its region surrounding the bearing ( 28 ) two opposing flat segments ( 42 , 43 ) and two opposing curved segments ( 44 , 45 ) so that the guiding surfaces ( 38 , 40 ) abut onto counter surfaces ( 50 , 52 ) formed on the flat segments ( 42 , 43 ) so that the mount ( 32 ) is free to move toward the guiding surfaces ( 38 , 40 ) relative to the bearing ( 28 ) when in its released state whilst the mount ( 32 ) is clampingly retained on the bearing ( 28 ) through the intermediate element ( 30 ) when in its clamped state characterized in that the counter surfaces ( 50 , 52 ) are formed on a respective one of the flat segments ( 42 , 43 ) of the intermediate element ( 30 ), said flat segments being disposed in the circumferential direction at a distance from curve segments ( 44 , 45 ) of the intermediate element ( 30 ) that are in the shape of a spherical segment.