Abstract: An orthopaedic implant provides a simple yet effective retention system requiring no additional components beyond the implant and the associated fastener(s). A plurality of anti-rotation protrusions on the fastener or screw head that match recesses in the implant. The protrusions engage the recesses to prevent the fastener from reversing direction, thereby assuring that the associated fastener does not backout during normal motion of the spine and other anatomical structures. A land on the fastener screw thread assures the fastener will not disengage from the implant should it strip out of the bone. Preventing the fastener from backing out assures it will not detach from the implant or staple, assuring that the implant will remain in place until all fasteners in the system have catastrophically failed. The anti-backout features of the invention provide feedback as they engage, allowing the surgeon to move quickly when placing a fastener without the concern for inadvertent over-tightening.
Abstract: A spinal correction system for the correction or arrest of scoliosis or spinal deformity in immature spines includes a bridge member, a pair of spaced apart legs extending substantially perpendicularly therefrom, and a fastener retaining portion extending substantially longitudinally from each end of the bridge member.
Type:
Grant
Filed:
May 11, 2005
Date of Patent:
September 20, 2011
Assignees:
Children's Hospital Medical Center, SpineForm LLC
Inventors:
Eric J. Wall, Donita I. Bylski-Austrow, Joseph E. Reynolds