Posterior spinal polyaxial locking lateral mass screw plate asse

Details Posterior spinal polyaxial locking lateral mass screw plate asse Posterior spinal polyaxial locking lateral mass screw plate asse

1995-05-22

1996-07-02

Tucker, Guy

Surgery

Instruments

Orthopedic instrumentation

606 70, 606 73, A61B 1770

Patent

active

055317464

ABSTRACT:
The present invention is a polyaxial lateral mass locking screw plate assembly for immobilization of vertebral bones, via fixation to surfaces thereof. In one embodiment the invention includes a narrow elongate plate having a plurality of holes, which in one variation are threaded, into which holes coupling elements may be inserted, or correspondingly screwed. The coupling elements have a cylindrical exterior, and have an semi-spherical interior volume into which the semi-spherical head of a bone screw may be inserted, and therein polyaxially mounted. In one variation the coupling element is a 7/8ths ring including a single axial slot. In another variation the coupling element includes a plurality of slots in its lower portion. In either variation insertion of a coupling element into a corresponding hole causes the interior volume to be crush locked to the head of the screw. In a second embodiment, the present invention includes a similar plate, having holes which are, however, threaded part of the way through the plate. In this embodiment, the bottom portion of the holes of the plate, additionally, have a curved interior surface which forms an annular lip for supporting a semi-spherical head portion of a bone screw. The coupling element of this embodiment is a short threaded cylindrical piece, having a concave bottom which locks the screw into the hole. Variations of each embodiment have means associated with the holes and/or the coupling element for locking the angle of the screw to the plate.

REFERENCES:
patent: 5053036 (1991-10-01), Perren et al.
patent: 5057111 (1991-10-01), Park
patent: 5147361 (1992-09-01), Ojima et al.
patent: 5180381 (1993-01-01), Aust et al.
patent: 5269784 (1993-12-01), Mast
patent: 5324290 (1994-06-01), Zdeblick et al.
patent: 5429639 (1995-07-01), Judet
"Cervi-Lok Cervical Fixation System", Spinetech, Inc., 980 East Hennepin Ave., Minneapolis, Minn 55414, 1994 Author unknown.
"System Overview--Axis Fixation System", Sofamor Danek, 1800 Pyramid Place, Memphis Tenn 38132, 1994 Author unkown.
"Surgical Technique--Orion Anterior Cervical Plate System", Sofamor Danek, 1800 Pyramid Place, Memphis Tenn 38132, 1994 Author unknown.
"Surgical Technique--ZPlate-ATL Anterior Fixation System", Sofamor Danek, 1800 Pyramid Place, Memphis Tenn 38132, 1994 Author unknown.

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