Patent ID: 8784458

Claim:
An insert disc for a bone plate, the insert disc comprising: a) an outer sidewall providing an insert disc thickness extending from a bottom surface to a top surface of the insert disc, wherein at least one of the top and bottom surfaces is planar; b) a first, unthreaded aperture extending through the insert disc thickness, wherein the first aperture comprises: i) a top region sidewall sloping downwardly and inwardly part-way through the insert disc thickness from a first diameter at the top surface to a ridge having a second diameter less than the first diameter, and ii) a bottom region sidewall extending from the ridge to the bottom surface, wherein the bottom region sidewall is aligned substantially perpendicular to the at least one of the top and bottom planar surfaces of the insert disc; c) a second, threaded aperture extending through the insert disc thickness; and d) an inlet that extends through the outer sidewall of the insert disc and is in open communication with the first, unthreaded aperture, but not the second, threaded aperture, e) wherein the first and second apertures are not in open communication with each other.