Polyaxial locking screw and coupling element

Details Polyaxial locking screw and coupling element Polyaxial locking screw and coupling element

1997-01-23

1998-10-06

Tucker, Guy V.

Surgery

Instruments

Orthopedic instrumentation

606 73, A61B 1770

Patent

active

058170944

ABSTRACT:
A polyaxial orthopedic device for use with rod implant apparatus includes a screw having a curvate head, a locking collar disposed therearound, and a coupling element having a tapered socket into which both the screw and the collar are securely nested. The locking collar is slotted and tapered, and has a semi-spherical interior volume into which the screw head is initially polyaxially held. The coupling element has an axial bore through which the screw and locking collar may be inserted, and a tapered bottom which provides a radially inward force on the locking collar when forces thereinto. This radially inward force causes the locking collar to crush lock against the head of the screw, therein locking the two at the instant angulation. In an initial disposition, however, the screw head remains polyaxially free with respect to the locking collar, and with the coupling element. The coupling element includes a transverse channel in which a rod may be disposed. In a first embodiment the channel is formed between a pair of upwardly extending members, and in a second embodiment, the channel is formed in the side of the element. In either case, a rod which is inserted in the channel, seats against the top of the locking ring.

REFERENCES:
patent: 3779240 (1973-12-01), Kondo
patent: 4493317 (1985-01-01), Klaue
patent: 4946458 (1990-08-01), Harms et al.
patent: 5053036 (1991-10-01), Perren et al.
patent: 5057111 (1991-10-01), Park
patent: 5147361 (1992-09-01), Ojima et al.
patent: 5151103 (1992-09-01), Tepic et al.
patent: 5180381 (1993-01-01), Aust et al.
patent: 5207678 (1993-05-01), Harms et al.
patent: 5269784 (1993-12-01), Mast
patent: 5324290 (1994-06-01), Zdeblick et al.
patent: 5360431 (1994-11-01), Puno et al.
patent: 5395371 (1995-03-01), Miller et al.
patent: 5429639 (1995-07-01), Judet
patent: 5443467 (1995-08-01), Biedermann et al.
patent: 5476464 (1995-12-01), Metz-Stavenhagen et al.
patent: 5480401 (1996-01-01), Navas
"Cervi-Lok Cervical Fixation System", Spinetech, Inc., 980 E. Hennepin Ave., Minneapolis, Minn. 55414, 1994.
System Overview-Axis Fixation System, Sofamor Danek, 1800 Pyramid Place, Memphis, TN 38132, 1994.
"Surgical Technique-Orion Anterior Cervical Plate System", Sofamor Danek, 1800 Pyramid Place, Memphis, TN 38132, 1994.
"Surgical Technique-ZPlate-ATL Anterior Fixation System", Sofamor Danek, 1800 Pyramid Place, Memphis, TN 38132, 1994.

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