Surgery – Instruments – Orthopedic instrumentation
Patent
1998-01-28
1999-08-03
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 73, 606 62, 606 63, 606 71, 606 69, 606 70, 606 60, A61B 1756
Patent
active
059318384
ABSTRACT:
An improved fixation assembly for orthopedic applications. The fixation assembly includes a screw having an upper shank portion, a middle section with a recessed area, and a lower threaded section. A locking ring surrounds the recessed area of the screw, with the diameter of the locking ring being greater than the diameter of the recessed area of said screw and less than the diameter of the shank and threaded sections of the screw. The screw and locking ring combination is used to attach an orthopedic plate to a bone. The orthopedic plate includes a hole for receiving the screw and the locking ring. The hole includes an upper section and a lower section, wherein the width of the upper section is less than the width of the locking ring so that the locking ring is compressed while in the upper section of the hole. The width of the lower section is greater than the width of the locking ring so that the locking ring is not compressed while in the lower section of the hole.
REFERENCES:
patent: 2922456 (1960-01-01), Kann
patent: 3414154 (1968-12-01), Rose et al.
patent: 3762455 (1973-10-01), Anderson, Jr.
patent: 3894467 (1975-07-01), Brescia
patent: 5269784 (1993-12-01), Mast
patent: 5398664 (1995-03-01), Betz
patent: 5639113 (1997-06-01), Goss et al.
Buiz Michael
Ho (Jackie) Tan-Uyen Thi
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