Multi-thread bone screw and method

US9247976B2 · kind B2 · utility

Assignee

• Warsaw Orthopedic, Inc.

Inventors

• Francis Denis · Minneapolis, US
• Timothy A. Garvey · Edina, US
• Joseph H. Perra · Shoreview, US
• Manuel Pinto · Minnetonka, US
• James Schwender · Edina, US
• Ensor Transfeldt · Edina, US
• Michael S. Veldman · Memphis, US
• William Alan Rezach · Covington, US

Key dates

• Filing date: Dec 12, 2011
• Grant date: Feb 2, 2016
• Expiry date: Dec 12, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B17/7059
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A bone screw comprises 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. A second threaded section extends contiguously from the first threaded section toward the proximal end portion The second threaded section has 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.