Method and apparatus for retaining screws in a plate
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United States of America Patent
Stats
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Jun 1, 2010
Grant Date -
Dec 22, 2005
app pub date -
Jun 17, 2004
filing date -
Jun 17, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A retention system for maintaining a screw to a vertebral plate. One or more screws extend through apertures within the vertebral plate. A cavity is positioned adjacent to and overlaps into the aperture. A ring is positioned within the cavity and held in position by a cap. The cap attaches to the plate to prevent removal of the ring. The ring is deflectable between a first shape to allow the screw to be inserted and removed from the aperture, and a second shape to prevent screw back-out from the aperture. A method of using the system is also included and comprises positioning the ring within a cavity in the plate, maintaining the position of the ring to the plate by attaching a cap, inserting a screw through the aperture and attaching the plate to a vertebral member, and positioning the ring over the screw head and preventing the screw from backing-out.
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