Surgery – Instruments – Orthopedic instrumentation
Patent
1995-05-31
1998-07-07
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 87, 606102, A61B 1758
Patent
active
057761370
ABSTRACT:
A tool mountable on an intramedullary rod projecting from the distal end of a femur, the tool carrying anterior and posterior caliper feelers for respectively engaging the anterior surface of the femoral cortex and the posterior surfaces of the condyles of the femur. The tool is adapted to be rotated with the rod to a determined angular position. The caliper feelers are supported on the tool to measure the perpendicular distance between the anterior surface of the femoral cortex and a plane inclined about an axis located in another plane tangent to the posterior surfaces of the medial and lateral condyles and at an angle correlated to the angle of rotation of the tool. A scale on the tool indicates prosthesis size on the basis of the distance measured. A distal cutting guide is mountable on the tool while still on the rod and the cutting guide has a guide slot for a cutting tool to form a planar cut at a distal end of the femur to resect a thickness of the femur based on the distance measured by the caliper feelers. Thereafter, a conventional A-P cutting guide is mounted on the rod or a pair of reference pins to enable anterior and posterior cuts to be made.
REFERENCES:
patent: 5234433 (1993-08-01), Bert et al.
patent: 5364401 (1994-11-01), Ferrante et al.
patent: 5454816 (1995-10-01), Ashby
patent: 5484446 (1996-01-01), Burke et al.
patent: 5486178 (1996-01-01), Hodge
Buiz Michael
Woo Julian W.
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