| abstract |
Stabilization device for dynamic stabilization of the spine with at least two bone anchoring elements that are to be screwed into the vertebrae, a rod-shaped element (103) that connects the bone anchoring elements, being formed a rod-shaped element section as an elastic element that is configured as an essentially cylindrical body with a first end (9, 17, 22) and a second end (9 '', 17 '', 22 '') opposite the first and with an elastic section between the first and the second end, and a continuous bore (2, 34, 37, 42) being provided in the elastic element that is coaxial to the central axis (M) and extending from the first end ( 9) to the second end (9 '') of the cylindrical body, or a blind bore that borders the first end, the elastic section being formed by at least two helical springs coaxially arranged such that the turns of a helical spring l (7) extend between the turns of another helical spring (8), at least in a section of the helical springs, and each of the two helical springs (7, 8) essentially equal 180 ° is rotated with respect to the other around of its common central axis, the helical springs being formed by a first recess (3) that spirally extends into the wall of the cylindrical body and a second spiral recess (4), which flow radially into the bore (2), and the rod-shaped element being configured in several pieces and having at least one rigid rod section and the elastic element as an independent element that is connected to the rigid rod section at one of its ends. |