| 摘要 |
PCT No. PCT/EP93/03669 Sec. 371 Date Aug. 16, 1994 Sec. 102(e) Date Aug. 16, 1994 PCT Filed Dec. 22, 1993 PCT Pub. No. WO94/14384 PCT Pub. Date Jul. 7, 1994.The present invention relates to a system for osteosynthesis at the vertebral column, in particular for stabilizing spinal segments including at least one rodlike connecting element (14) and at least two retaining units (12). Each retaining unit can be anchored to a spinal segment with a tuning-fork-shaped head, (15) the two limbs (16, 17) of which delimit an approximately U-shaped receptacle (18) for the connecting element (14) A clamping screw (19) can be screwed into the receptacle (18) to fix the connecting element (14) between the two limbs (16, 17) of the tuning-fork-shaped screw head (15) The floor (22) of the receptacle (18) has a concave shape to correspond to a swivel-bearing element (23) disposed between the floor (22) of the receptacle (18) and the connecting element (14) The element (24) has a bearing surface (24) faces the floor (22) of the receptacle (18) and, has a complementary convex curvature. The bearing surface (24) of the swivel-bearing element (23), facing the floor (22) of the receptacle (18), is dish-shaped, in particular hemispherical. The opposite side (25) of the element, which faces the clamping screw (19) in the assembled state, moreover includes a groove (26) to receive the rodlike connecting element (14). |
