Variable angle screw for spinal implant system

Details Variable angle screw for spinal implant system Variable angle screw for spinal implant system

1992-02-18

1993-11-16

DeMille, Danton D.

Surgery

Instruments

Orthopedic instrumentation

606 72, 606 60, A61F 504

Patent

active

052619095

ABSTRACT:
A variable angle bone screw system for use in a spinal implant system to connect a vertebral fixation element to a spinal rod extending adjacent the vertebral column in a patient. The system includes an eyebolt having a threaded stem, a washer receivable over the stem of the eyebolt, a bone screw including a yoked head to permit top loading of the stem of the eyebolt, and a nut engaging the threaded stem of the eyebolt and cooperating with the eyebolt to clamp the bone screw and washer therebetween. The bone screw head and the washer include interdigitating locking means for restraining the pivoting of the screw about the axis of the eyebolt threaded stem but permitting interlocking in variable angular orientations.

REFERENCES:
patent: 4662365 (1987-05-01), Gotzen et al.
patent: 4946458 (1990-08-01), Harms et al.
patent: 4987892 (1991-01-01), Krag et al.
patent: 5002542 (1991-03-01), Frigg et al.
patent: 5047029 (1991-09-01), Aebi et al.
patent: 5127912 (1992-07-01), Ray et al.
"Surgical Technique Manual" by Danek Medical, Inc., published 1990.

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