Inventors:
Francis Denis - Minneapolis MN, US
Timothy A. Garvey - Edina MN, US
Joseph H. Perra - Shoreview MN, US
Manuel Pinto - Minnetonka MN, US
James D. Schwender - Edina MN, US
Ensor Transfeldt - Edina MN, US
Michael S. Veldman - Memphis TN, US
William A. Rezach - Atoka TN, US
Assignee:
Warsaw Orthopedic, Inc. - Warsaw IN
International Classification:
A61B 17/04, A61B 17/86, A61F 2/08
Abstract:
A bone screw comprising a threaded shank including a distal end portion and a proximal end portion, and defining a first threaded section extending from the distal end portion toward the proximal end portion and adapted for anchoring in cancellous bone, and a second threaded section extending contiguously from the first threaded section toward the proximal end portion and adapted for engagement in cortical bone, with the second threaded section having a finer thread pattern relative to the first threaded section. In one embodiment, the first threaded section includes a first helical threading defining a single lead thread pattern for anchoring in cancellous bone, and the second threaded section includes a second helical threading interleaved with the first threading to define a duel lead thread pattern for engagement in cortical bone. In a further embodiment, the bone screw includes a head portion extending from the threaded shank and configured for coupling to a spinal implant.