Device for setting a spine

Details Device for setting a spine Device for setting a spine

1994-02-18

1995-12-19

Graysay, Tamara L.

Surgery

Instruments

Orthopedic instrumentation

606 73, A61B 1770

Patent

active

054764645

ABSTRACT:
The present invention relates to a device for setting a spine having damaged vertebrae, comprising an anchoring element including a shaft portion (16) to be attached to spaced vertebrae, the free end of said anchoring element including a slot (24) for receiving a distracting or, respectively, compressing bar (40) and a cap nut (42) to be screwed onto an outer thread (32) provided in the region of the receiving slot to urge an axial fixing portion (44) towards the bar received in said receiving slot. The invention is defined in that the receiving slot (24) is formed in a separate swivel head (20) including an inner end in the shape of a ball receiving portion (23) which has an aperture (28) through which said shaft portion (16;52) of the anchoring element (10;50) extends, wherein the diameter of the shaft portion adjacent said aperture is smaller than that of said aperture ( 28 ), and that a ball head ( 14;56 ) is provided at the end of the shaft portion ( 16;52), said ball head having a diameter larger than that of said aperture (28) and said ball head (14;56) in the ball receiving portion (23) entering the terminal region of said receiving slot (24) .

REFERENCES:
patent: 5176678 (1993-01-01), Tsou
patent: 5207678 (1993-05-01), Harms et al.

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