Bone screw

Details Bone screw Bone screw

1994-02-18

1995-08-22

Aschenbrenner, Peter A.

Surgery

Instruments

Orthopedic instrumentation

606 72, 606 54, 606 73, A61F 504

Patent

active

054434670

ABSTRACT:
A bone screw comprises a receiver member (5) and a screw member (1) having a threaded portion (2) and a head (3) having a spherical segment-shaped portion. The receiver member (5) comprises an internal thread (10) for allowing a relative adjustment of receiver member and screw member and the connection of the receiver member with a round rod. A pressure means (12) acts onto the head (3) and the rod (16) is placed on top of the pressure means. The arrangement is locked by means of a rod locking nut (13) and a lock nut (14) is screwed onto an external thread (11).

REFERENCES:
patent: 4299212 (1981-11-01), Goudfrooy
patent: 5176680 (1993-01-01), Vignaud et al.
patent: 5190543 (1993-03-01), Schlapfer
patent: 5261912 (1993-11-01), Frigg
patent: 5306275 (1994-04-01), Bryan

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