Torsional tightener for bone anchoring or implant elements/tools
Patent 5725533 Issued on March 10, 1998. Estimated Expiration Date: 
November 12, 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.
November 12, 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 3174559 3693726 3825912 Screw driver Power tool Method of and apparatus for making up a threaded connection Method and apparatus for fastener tensioning Electronically indicating torque wrench Tie layer for co-extruded acrylonitrile copolymers Device and method for inserting a bone screw InventorAssigneeApplicationNo. 745313 filed on 11/12/1996US Classes:606/101, Nail or plate bender606/104Screw or pin placement or removal meansExaminersPrimary: Buiz, MichaelAssistant: Truong, Kevin Attorney, Agent or FirmForeign Patent References
International ClassA61B 017/58Foreign Application Priority Data1990-03-09 SEAbstractA compact torsional tightener system for anchoring tools or implants in bone or dentine or elements in implants anchored in bone or dentine sufficiently compact to be inserted into a patient's mouth includes a transformerless electric motor with a small rotating mass operating at a speed of about 10,000 to about 15,000 revolutions per minute and powered by an energy supply circuit. A gear part converts the speed of the motor to a slower speed. A controller senses the torque from the tool or element being anchored and interrupts the energy supply circuit at the predetermined parameter value such that the controller controls the rotational inertia in the motor, motor shaft, and element or tool so as to permit the motor, motor shaft and tool or element to rotate beyond a point where they are located when the electrical energy is interrupted to bring about a torsional tightening moment near a preselected optimal point substannially near but not exceeding a breaking point of the weakest member of the element, tools, or implants. A majority of the increasing torsional resistance from the bone or dentine is imparted to the element, tool, or implant by the implant, bone or dentine over during 1/2 to 1/2 turn of the element, tool, or implant. The energy supply circuit is interrupted such that the effect of rotational energy in the tightener after the interruption causes the tool or element to rotate by at most 10%.Field of SearchHand manipulatable implementHaving means facilitating assembly or disassembly Removable tool element By fastening to jawbone By screw Screw or pin placement or removal means Nail or plate bender Responsive to movement of work Responsive to torque on work Means for regulating motor Rotatable, coaxial, clutching components With electric signal device Screw Electrical Overload release Drive means responsive to torque or speed condition Having torque sensor Strain gauge Proximity angle detector WITH INDICATING OR SIGNALING MEANS AUTOMATIC CONTROL OF POWER OPERATED MEANS For making or breaking threaded connections (e.g., torque measuring wrenches) With variable capacity or sensitivity With detection of specific torque value or condition (e.g., peak torque) Rate of change | |
