Xomed Surgical Products, Inc.

Stephen M Vajda

F Barry Bays

Randall D Ross

An instrument for extracting an orthopedic prosthesis having an elongated shank implanted in bone and defining a first longitudinal axis and a tapered stem projecting from the shank and defining a second longitudinal axis oriented at an oblique angle relative to the first axis includes a lower jaw defining a first opening for receiving the tapered stem, an upper jaw pivotally connected to the lower jaw and defining a second opening in opposed relation to the first opening, and a mechanism for pivoting the upper and lower jaws apart so that, when the tapered stem is received in the first and second openings, at least one of the first and second openings is caused to tilt relative to the second longitudinal axis such that diagonally opposed inside surfaces of the tilted opening contact the tapered stem of the prosthesis at longitudinally spaced locations to secure the instrument to the tapered stem so that an extraction tool can be attached to the instrument and used to exert an extraction force substantially parallel to the first longitudinal axis of the prosthesis. One of a plurality of inserts having differently sized openings is preferably telescopically received in the second jaw opening to accomodate various degrees of taper, and the insert is preferably held in place within the jaw opening by a retainer such as a shoulder screw threaded into the top surface of the upper jaw so that, when the jaws are pivoted apart, inner surfaces of the insert opening will contact the tapered stem to secure the instrument to the prosthesis.

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Largo, FL, United States of America

Stephen M Vajda