Patent ID: 9066731
Filing Date: 2015-06-30
Classification: A61B

Abstract:
1. An instrument for removing tissue from a bone to create a cavity, comprising: a spherical body having a pole, an equator, a center, a polar axis, an inner surface, an external surface, a polar edge defined as a line, near the pole, where the external surface and the inner surface meet, and cutting formations formed in the external surface for cutting the bone, the body being rotatable about the polar axis, the body having a polar recess formed at the pole, the polar recess being defined at least in part by the polar edge, and a plurality of cutting ridges extending from the inner surface adjacent the polar edge toward the polar axis; and wherein the angle subtended at the center of the body between (a) the polar axis and (b) a radius that connects a cutting formation that is furthest from the polar recess and the center of the body, is at least 100°.