Spinal fixator reduction frame

Details Spinal fixator reduction frame Spinal fixator reduction frame

1991-02-15

1993-06-15

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606 54, 606105, A61F 501

Patent

active

052193497

ABSTRACT:
A reduction frame according to the present invention is secured to shaft handles extending from the pedicle screws of a Vermont Spinal Fixator type implant. Shaft clamps secure two T-handles of the reduction frame to the shaft handles. A lower-rod assembly joins the two opposite T-frames by means of lower-rod clamps. The shaft clamps are provided with four degrees of freedom. The joint between the lower-rod assembly and T-handle is provided with five degrees of freedom. The lower-rod assembly and the T-handle are provided with power screw threads to allow for precise translational control. The shaft clamps and lower-rod clamps are provided with taper fit joints to allow for infinite rotational adjustment and fixture. An upper-rod assembly is also provided on the T-handles to produce rotation of the T-handles by providing means for changing the distance between the upper ends of the T-handles. Finger grips are provided on the upper-rod assembly to allow the surgeon to easily use one hand to either apply or monitor the force acting along the upper-rod.

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Dick et al., A New Device for Internal Fixation of Thoracolumbar and Lumbar Spine Fractures: The `Fixateur Interne`, Paraplegia, vol. 23, p. 230 (1985).
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