Locking device for securing a rod-shaped element in a...

Details Locking device for securing a rod-shaped element in a... Locking device for securing a rod-shaped element in a...

2007-05-01

2007-05-01

Barrett, Tom (Department: 3738)

Surgery

Instruments

Orthopedic instrumentation

C606S071000, C606S075000

Reexamination Certificate

active

10329888

ABSTRACT:
A locking device is provided for securing a rod in a receiving part, in particular a polyaxial bone screw. The locking device has a sleeve-type element with a cylindrical outer face and is dimensioned such that the element is displaceable between the legs of the receiving part. The element has an inner thread for receiving an inner screw. An outer nut can be screwed on to an outer thread of the legs to fix the element. The element acts on a pressure element provided in the receiving part to fix the position of the head of the polyaxial bone screw and the inner screw acts on the rod to fix it. The element is preferably provided with slits. During screwing in of the inner screw, the element splays out against the outer nut and thus effectively prevents loosening or detaching.

REFERENCES:
patent: 2440944 (1948-05-01), Green
patent: 5443467 (1995-08-01), Biedermann et al.
patent: 5672176 (1997-09-01), Biedermann et al.
patent: 5690630 (1997-11-01), Errico et al.
patent: 5797911 (1998-08-01), Sherman et al.
patent: 5928233 (1999-07-01), Apfelbaum et al.
patent: 6077262 (2000-06-01), Schlapfer et al.
patent: 6443953 (2002-09-01), Perra et al.
patent: 6835196 (2004-12-01), Biedermann et al.
patent: WO 98/25534 (1998-06-01), None

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