Reversible bone screw lock

Details Reversible bone screw lock Reversible bone screw lock

1994-06-30

1995-12-26

Graysay, Tamara L.

Surgery

Instruments

Orthopedic instrumentation

A61B 1786

Patent

active

054783429

ABSTRACT:
A medical bone screw including a lock to lessen the possibility of pull-out or screw-out. The screw may be any bone screw including a cannula. A wire spring is inserted partially into the cannula prior to use. Once in position, the wire spring is pushed further down the cannula until its ends may project out side openings in the screw. These projections lock the screw in place. Further depression of the wire spring disengages them so the screw may be removed.

REFERENCES:
patent: 231588 (1880-08-01), Kernochan
patent: 324768 (1885-08-01), Hunt
patent: 867429 (1907-10-01), Simmerman
patent: 1075911 (1913-08-01), Gobin
patent: 2631584 (1953-03-01), Purificato
patent: 2998007 (1961-08-01), Herzog
patent: 3204785 (1962-03-01), Dobelle
patent: 3579831 (1971-05-01), Stevens et al.
patent: 3618212 (1971-11-01), Weissman
patent: 4190044 (1980-02-01), Wood
patent: 4636121 (1987-01-01), Miller
patent: 5087260 (1992-02-01), Fixel
patent: 5338197 (1994-08-01), Kwan

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