Inventors:
Gary S. Lindemann - Collierville TN, US
Larry Gause - Memphis TN, US
Robert A. Farris - Cordova TN, US
Stephen Papadopoulos - Paradise Valley AZ, US
Rick Sasso - Carmel IN, US
Volker Sonntag - Phoenix AZ, US
Vince Traynelis - Iowa City IA, US
Iain Kalfas - Beachwood OH, US
International Classification:
A61B 17/80
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.