Grace Manufacturing, Inc.

Dan Duerr

Richard L Grace

Jeff Grace

The present invention is a backing plate for an acetabular reamer assembly that allows for the attachment of a reamer driver. The acetabular reamer assembly comprises a cutting cup and backing plate, the cutting cup having an external surface with cutting teeth formed therein and having an internal surface, the cutting cup terminating in a peripheral edge. The rigid backing plate has a planar surface which terminates in an outer circumferential edge, the outer circumferential edge being coupled to the peripheral bottom edge of the cutting cup, the rigid plate also having an internal edge profile. The internal edge profile of the rigid backing plate has at least two finger elements protruding from the outer circumferential edge thereof towards a central vertical axis drawn perpendicular to the planar surface of the plate. Further, the finger elements of the backing plate form a holding opening for a reamer driver. The internal edge profile of the backing plate forms at least one observation opening in addition to the holding opening to allow bone fragments forming within the acetabular reamer to be visually inspected while the reamer is in use. The finger elements terminate to form a contact surface to make firm contact with the driver when inserted in the holding opening. The contact surface can be simple or complex. Further, the internal edge profile is continuous so that the machining process for the backing plate is simplified.

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Rsul, AR, United States of America

Dan Duerr