Spinal plate with internal screw locks
AssigneeSpinal LLC
InventorsRobert Doubler, John Hammill
Life of this patent
Estimating the term…
Abstract
A bone plate for stabilizing adjacent vertebrae or ends of a bone has a span for extending across the discontinuity. The span has brackets for attaching to the bone. The brackets have countersunk apertures terminating through which bone screws are placed in the bone. An eccentric cam bore is located between the countersunk apertures and, upon rotation of an eccentric cam, wedge grip shoes are slid into the countersunk apertures and frictionally engage the spherical heads of the bone screws. To prevent back-out of the bone screws, the eccentric cam is locked into the wedge grip shoes.
Claims13
A bone plate for attachment to bone across discontinuaties comprising an elongated span having a first end and a second end, a first bracket on said first end and a second bracket on said second end, said first and said second bracket each having at least one aperture adapted to receive a bone fastener, said first bracket and said second bracket each having a slot therein, a wedge shoe slidably disposed in said slot, a rotatable cam in said slot having a cam surface contacting said wedge shoe whereby rotation of said cam slides said wedge shoe partially into said aperture.
A bone plate for stabilizing adjacent vertebrae comprising a span for bridging intervertebral space, said span having a bone engaging surface and a distal surface, a first bracket one end of said span and a second bracket on the other end of said span, said first bracket having a first bone fastener aperture and a second bone fastener aperture therethrough, a cam bore between said first bone fastener aperture and said second fastener aperture, a slot in said first bracket extending from said first bone fastener aperture to said second bone fastener aperture, an eccentric cam rotatably mounted in said cam bore having cam surfaces, a first wedge shoe slidably disposed in said slot between said cam and said first bone fastener aperture and contacting said cam surface, a second wedge shoe slidably disposed in said slot between said cam and said second bone fastener aperture and contacting said cam surfaces, a cam cover plate closing said slot whereby rotating said cam slides said first and said second wedge shoe partially into said first and said second bone fastener aperture, respectively.
Dependencies are inferred from the claim text.