US Patent 5,931,837
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A fixator for adjustably securing a first skeletal element on a superior side of an ankle joint relative to a skeletal element on the inferior side of the ankle joint. The fixator includes a bone screw clamping assembly that preferably secures a pair of screws to the bones of the foot. The bone screw clamping assembly is attached to a central body of the fixator and is operative for articulating the pair of bone screws about an axis substantially co-axial with the anatomical pivot axis of the ankle joint. The bone screw clamping assembly further defines a radiographic window for permitting lateral radiographic examination of the anatomical pivot axis of the ankle joint.
Marsh, Lawrence J. and Bottlang, Michael Method and apparatus for external fixation of an ankle. US Patent 5,931,837 filed December 09, 1997 and issued August 03, 1999. https://ir.uiowa.edu/patents/217