Device and method for inserting a bone screw
Patent 4359906 Issued on November 23, 1982. Estimated Expiration Date: 
November 23, 1999. 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 23, 1999. 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 ReferencesTightening system Method and apparatus for pretensioning screw joints Simplified fastening technique using the logarithmic rate method Patent #: 4305471 InventorAssigneeApplicationNo. 06/040099 filed on 05/18/1979US Classes:73/862.23, With detection of specific torque value or condition (e.g., peak torque)73/761, Threaded fastener stress81/467Responsive to torque on workExaminersPrimary: Ruehl, Charles A.Attorney, Agent or FirmInternational ClassesA61B 17/88 (20060101)B25B 23/14 (20060101) Foreign Application Priority Data1978-05-20 CHAbstractA device for tightening a screw into bone material to a defined torque value MO less than that at which the bone irreversibly deforms including means for measuring the torque, M, necessary to obtain an angular rotation, , measured from the point where the screw first contacts the underlying material, and determining a value for MO as a function of M/.Other References
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