Patent ID: 7922721

Claim:
A tool for cutting a hemispherical cavity in bone, comprising: a) a hemispherical, hollow dome extending from an apex to an equatorial rim, wherein a rotational axis central to the dome is aligned with the dome apex and wherein the equatorial rim is spaced from the rotational axis; b) at least one mounting bar extending perpendicular to the rotational axis with spaced apart ends secured to opposed locations of the dome; c) a plurality of first cutting teeth arrayed along the dome, but spaced from the equatorial rim thereof; d) at least two second cutting teeth, each second cutting tooth located at the equatorial rim and characterized as being a portion of the material of the dome having been raised in an upwardly direction to provide a second cutting edge of a cutting radii spaced further from the rotational axis than a hemispherical radii of the hemispherical dome to thereby interrupt the hemispherical continuity of the equatorial rim with the second cutting edge; and e) wherein the cutting radii and the hemispherical radii are each measured from a point where the rotational axis and an equatorial plane of the dome aligned perpendicular to the rotational axis meet.