Surgery – Instruments – Orthopedic instrumentation
Patent
1996-11-12
1998-03-10
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606104, A61B 1758
Patent
active
057255334
ABSTRACT:
A 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%.
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Buiz Michael
Nobel Biocare AB
Truong Kevin
LandOfFree
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