Implant for correction and stabilization of the spinal column
An implant for the correction and stabilization of the spinal column, comprising pedicle screws that can be screwed into the vertebrae of a spine, and of at least one connection element that connects the pedicle screws at the screw heads. This connection element is formed by a spiral whose spiral windings are arranged offset in the axial direction, following a screw line.
1. An implant for the connection and stabilization of a spinal column having vertebra, the implant comprising:
a) a plurality of pedicle screws each having at least one screw head wherein said plurality of pedicle screws is capable of being screwed into the vertebra; and
b) at least one connection element formed over its entire axial expanse by at least two spirals, each spiral having spiral windings, wherein said spiral windings are arranged offset in an axial direction following a screw line, wherein said at least one connection element connects at least one of said plurality of pedicle screws to an adjacent one of said plurality of pedicle screws, wherein an inner spiral of said at least two spirals is arranged inside a spiral interior of an outside spiral of said two spirals, wherein a direction of rotation of the windings of said at least two spirals is in opposite directions; and
c) a spiral core which is arranged in an interior of said inner spiral over at least a partial region of its axial expanse, wherein said spiral core is configured as a titanium rod formed from multiple segments, and wherein at least two of said rod segments have at least two different material properties at least in the form of bending stiffness.
2. The implant as in claim 1 , further comprising a plurality of holders which are coupled to said screw heads of said plurality of pedicle screws, wherein said plurality of holders are for allowing an insertion of said at least two spirals, which have clamping means for securing said at least two spirals in said plurality of holders.
3. The implant according to claim 1 , wherein said at least two spirals are formed as flat wire spirals.
4. The implant according to claim 3 , wherein said at least two spirals are made from titanium.
5. The implant as in claim 3 , wherein said at least two spirals are made from surgical grade steel.
6. The implant according to claim 3 , wherein said flat wire has a material thickness from 0.4 mm to 2.8 mm.
7. The implant according to claims 3 , wherein said flat wire has a material thickness of 1.2 mm.
8. The implant according to claim 3 , wherein said flat wire has a material width of 2 mm to 8 mm.
9. The implant according to claim 3 , wherein said flat wire has a material width of 4 mm to 6 mm.
10. The implant according to claim 3 , wherein an inside diameter of said spiral has a size of between 2.5 mm to 7.5 mm.
11. The implant according to claim 3 , wherein an inside diameter of said spiral has a size of between 3.2 and 4.6 mm.
12. The implant according to claim 3 , wherein adjacent spiral windings have a distance of 0.5 mm to 2.5 mm from one another.
13. The implant according to claim 1 , wherein a distance between adjacent spiral windings of said inner spiral is selected to be greater than in the case of the outer spiral.
14. The implant as claimed in claim 1 , wherein said rod is formed from surgical grade steel.