Bone screw
Patent 5169400 Issued on December 8, 1992. Estimated Expiration Date: 
November 9, 2010. 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.
November 9, 2010. 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 324768 2112007 3103926 Bone fracture fixation and compression apparatus Fasteners particularly useful as orthopedic screws Cardiovascular prosthetic devices and implants with porous systems Helical mandibular implant Absorbable bone fixation device Patent #: 4539981 InventorsAssigneeApplicationNo. 585123 filed on 11/09/1990US Classes:606/73, Threaded fastener element411/395, Having bore therethrough411/403, Socket or slot606/72, Orthopedic fastener606/77AbsorbableExaminersPrimary: Hafer, Robert A.Assistant: Rimell, Sam Attorney, Agent or FirmForeign Patent References
International ClassA61B 017/58Foreign Application Priority Data1988-04-02 DEAbstractIn order to reduce the risk that a bone screw, in particular one made of resorbing plastic material, with an externally threaded shaft will be destroyed by high screw-in torques, it is proposed that an insertion channel open at the top, arranged concentrically with the shaft and extending along most of the length of the shaft be located in the shaft for an insertion tool and have a cross-section which is non-circular and corresponds to the cross-section of the screwing-in tool. | |
