Device comprising an implant and screws for fastening said implant to a bone, and a device for connecting two separated pieces of bone
Patent 4484570 Issued on November 27, 1984. Estimated Expiration Date: 
November 27, 2001. 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 27, 2001. 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 2267925 2699774 3255747 Universal joint prosthesis with cap Patent #: 4332036 InventorsAssigneeApplicationNo. 06/266352 filed on 05/22/1981US Classes:606/72, Orthopedic fastener606/71Having separable and distinct plate elementsExaminersPrimary: Apley, Richard J.Assistant: Isabella, David J. Attorney, Agent or FirmInternational ClassesA61B 17/80 (20060101)A61B 17/68 (20060101) A61C 8/00 (20060101) A61B 17/86 (20060101) Foreign Application Priority Data1980-05-28 CHAbstractA plate is provided with clearance holes and fastening screws. Each screw is provided in the region of its head with a clamping part subdivided into tongues by means of slots and provided with an internal opening bounded by a conical surface. To each screw belongs an expander having a conical outer surface. The expander is axially displaceable in relation to the clamping part to force the tongues of the clamping part apart and lock the screw in relation to the plate. A rigid connection between the plate and the screws is thus provided, even if reabsorption of bone material takes place at the bearing surface of the plate.Other References
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