Surgery – Instruments – Orthopedic instrumentation
Patent
1995-05-26
1997-07-01
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606 69, 606 73, A61B 1780
Patent
active
056432658
ABSTRACT:
A dynamic compression polyaxial locking screw plate assembly for reduction and/or drawing together, and immobilization, of displaced bone segments. The assembly comprises a plate, having an upper portion and a lower portion, at least one of which portions includes an elongate hole, into which hole a screw and coupling element is inserted. Complete insertion of the coupling element into the elongate hole causes the element to translate along sloped surface conformations of the lateral sidewalls, to a proximal end. This translation causes the bone segment into which the screw is inserted to translate relative to the plate. In a first embodiment, the coupling element has a tapered cylindrical exterior, and an interior semi-spherical concave surface in which the semi-spherical head of a bone screw may be polyaxially mounted. The plate of this first embodiment includes an axially widening, tapered sidewall conformation. In a second embodiment, the coupling elements include external annular flanges which mate in sloped channels in the sidewalls of the elongate holes. In a third embodiment, the lateral sidewalls of the elongate holes have inwardly curved lower lips which are sloped downward along the axial length of the elongate holes. The lower lips support the semi-spherical head of the corresponding screw without the aid of a coupling element. Additional round holes and holding screws are provided for additional securing strength after the compression has been provided.
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Errico Joseph P.
Errico Thomas J.
Ralph James
Fastenetix, L.L.C.
Tucker Guy V.
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