Bone screw
Patent 5743914 Issued on April 28, 1998. Estimated Expiration Date: 
June 6, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 6, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re34969 1809758 2263137 3207023 Self-cutting fast construction screw Cannula Self-tapping screw Tapered bone screw with continuously varying pitch Patent #: 5562672 InventorApplicationNo. 659782 filed on 06/06/1996US Classes:606/73, Threaded fastener element411/412, Plural threads on single shank606/60Internal fixation meansExaminersPrimary: Buiz, MichaelAssistant: Reip, David O. International ClassA61B 017/86AbstractA bone screw having a head with a socket for receiving a screw driving device and a shaft extending from the head. The shaft includes respective alternating first and second helical threads running substantially parallel with each other along the shaft. Additionally, the second series of helical threads exhibits a diameter substantially different than the first series of helical threads. In accordance with this aspect of the invention, the thread pattern of the bone screw exhibits a hi-low thread configuration. In addition, the bone screw may comprise a plurality of series of helical threads, each exhibiting different diameters from the others. | |
