Surgical fixation system

Abstract

The present invention relates to a surgical fixation system comprising at least one anchor element (12) having an anchor portion (24) for fixation to a bone (20) and a receiving portion (26) for a stabilizing element (16) for connection to a further anchor element (12), the stabilizing element (16) being positionable in the receiving portion (26) and fixable in the receiving portion (26) by a fixation element (44), the fixation system (10) comprising an abutment element (22) positioned on the receiving portion (26) and contacting the anchor portion (24) for positioning the stabilizing element (16), the abutment element (22) having at least one deformation region (58) that deforms depending on the fixation force of the fixation element (44) acting on the stabilizing element (16).

Claims

1. A surgical fixation system comprising at least one anchor element (12) having an anchor portion (24) for fixing to bone (20) and a receiving portion (26) for a stabilizing element (16) for connecting to a further anchor element (12), The stabilizing element (16) is capable of being positioned within the receiving portion (26) and can be fixed within the receiving portion (26) by the fixing element (44), The aforementioned fixing system (10) includes an abutment element (22), The abutment element (22) is positioned on the receiving portion (26) and contacts the anchor portion (24) in order to position the stabilizing element (16). The abutment element (22) has at least one deformation region (58) that deforms depending on the fixing force of the fixing element (44) acting on the stabilizing element (16), The abutment element (22) has at least a partially sleeve-like configuration and has an abutment region (54) for the stabilizing element (16) on its end face. The at least one deformation region (58) is located below the abutment region (54) of the abutment element (22) for the stabilizing element (16), The at least one deformation region (58) is formed in the abutment element (22) by at least one material recess, or has at least one material recess. A surgical fixation system wherein the abutment element (22) has a configuration that allows for plastic deformation in at least one deformation region (58) by the fixing force of the fixing element (44) acting on the stabilizing element (16).

2. The fixing system according to claim 1, wherein the abutment element (22) is formed separately from the receiving portion (26) and is arranged on the receiving portion (26), or the receiving portion (26) constitutes or forms the abutment element (22).

3. The fixing system according to claim 1 or 2, wherein the at least one deformation region (58) is located in the abutment region (54) of the abutment element (22) for the stabilizing element (16).

4. The stabilizing element (16) is in contact with the lateral abutment region (68), The fixing system according to any one of claims 1 to 3, wherein the at least one deformation region (58) is located in or adjacent to the lateral abutment region (68) for the stabilizing element (16).

5. The abutment element (22) has a first abutment element portion (55) facing the stabilizing element (16) and a second abutment element portion (57) facing the anchor portion (12), The fixing system according to any one of claims 1 to 4, wherein the first abutment element portion (55) constitutes or forms the at least one deformable region (58) and, as a result of the fixing force, has higher deformability than the second abutment element portion (57).

6. a) A discontinuous partial boundary is provided between the first abutment element portion (55) and the second abutment element portion (57) with respect to the deformability of the abutment element (22), or b) A transition portion exists in relation to the deformability of the abutment element (22), and the first abutment element portion (55) and the second abutment element portion (57) are joined together via the transition portion. The fixing system according to claim 5, wherein at least one of the above.

7. The fixing system according to claim 5, wherein a discontinuous partial boundary is provided between the first abutment element portion (55) and the second abutment element portion (57) with respect to the deformability of the abutment element (22), and the partial boundary is oriented laterally with respect to the fixing direction of the fixing element (44) in the direction of the anchor portion (24).

8. The aforementioned at least one deformation region (58) is a) Having a portion that extends parallel to the abutment region (54) of the abutment element (22) for the stabilizing element (16), or b) With respect to the axis (34) of the receiving portion and / or the plane of symmetry (60) including the abutment element (22), the abutment element (22) is arranged or formed symmetrically on the abutment element (22). A fixing system according to any one of claims 1 to 7, wherein at least one of the above.

9. The material recess is a deformable recess provided on the surface of the abutment element (22), and / or The fixing system according to any one of claims 1 to 8, wherein the material recess is a cavity formed in the abutment element (22) and is surrounded in all directions.

10. The fixing system according to any one of claims 1 to 8, wherein the material recess is a through-opening (62) of the abutment element (22), or has a through-opening (62).

11. The aforementioned material recess is a) Having a portion that extends along the stabilizing element (16) positioned on the receiving portion (26), or b) Having a portion that extends radially with respect to the axis (48) defined by the abutment element (22), A fixing system according to any one of claims 1 to 10, wherein at least one of the above.

12. The abutment element (22) has a different material with respect to deformability, or has two or more deformable parts (72, 74, 76) made of different materials. The fixing system according to any one of claims 1 to 11, wherein at least one deformed region (58) is formed as a result of materially different qualities of the two or more deformed portions (72, 74, 76).

13. The fixing system according to claim 12, wherein the two or more deformable parts (72, 74, 76) are deformable parts of the abutment element (22) that are formed separately from each other and joined together.

14. The fixing system according to claim 13, wherein a first deformable portion (72) is provided, the first deformable portion (72) is at least partially surrounded by at least one second deformable portion (74), and the deformability of the first deformable portion (72) is greater than that of the at least one second deformable portion (74).

15. A fixing system according to any one of claims 12 to 14, wherein three or more deformable parts (72, 74, 76) are provided, and the deformability of each deformable part (72, 74, 76) that at least partially surrounds a further deformable part (72, 74, 76) is less than the deformability of the surrounded deformable part (72, 74, 76).

16. The fixing system according to any one of claims 1 to 15, wherein the abutment element (22) has a plurality of deformation regions (58).

17. The fixing system according to claim 16, wherein two deformation regions (58) are provided, which are spaced apart from each other and aligned on the abutment element (22).

18. The abutment element (22) is a) Having two diametrically opposed deformation regions (58), or b) Having two support members (66) positioned at a distance from each other and laterally dividing a tapered recess (70), wherein the stabilizing element (16) can be positioned in the recess (70) between the support members (66), or c) Oriented or oriented coaxially with the receiving portion (26) and / or the anchor portion (24), A fixing system according to any one of claims 1 to 17, wherein at least one of the above.

19. The abutment element (22) has two support members (66) that are spaced apart from each other and laterally divide the tapered recess (70), The fixing system according to any one of claims 1 to 17, wherein the stabilizing element (16) is configurable in the recess (70) between the support members (66), and the deformation region (58) is located on at least one of the support members (66).

20. The fixing system according to any one of claims 1 to 19, wherein the anchor portion (24) and the abutment element (22) have mutually compatible abutment regions (30, 56) and are at least partially spherical cup-shaped.

21. A fixing system according to any one of claims 1 to 20, comprising at least one of two or more anchor elements (12), two or more abutment elements (22), at least one stabilizing element (16), and at least one fixing element (44).

22. The fixing system according to any one of claims 1 to 21, wherein at least one of the following is employed: the at least one anchor element (12) is a bone screw; the at least one stabilizing element (16) is a rod element (18); and the at least one fixing element (44) is a screw element (46) that can be screwed into the receiving portion (26).

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