Instrument for removing tissue
AssigneeDepuy International Limited
InventorGary Moore
Life of this patent
Estimating the term…
Abstract
An instrument for removing tissue from a bone to create a cavity consists of an approximately spherical body having cutting formations in its external surface for cutting a bone. The body has a connector by which it can be connected to a drive by which it can be rotated about an axis, and a recess at the pole, opposite the connector. When the instrument is applied to the surface of a bone and is rotated about its axis, bone is cut as a result of the action of the formations against the bone, and a circular region of bone adjacent to the polar recess in the body remains generally intact.
Claims17
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°.
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 cutting formations are provided on the external surface over an area that extends from the polar recess to a point beyond the equator of the body.
Dependencies are inferred from the claim text.