Acetabular reamer

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 having 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.

A tool for cutting a hemispherical cavity in bone, comprising:

• a) a hemispherical, hollow dome extending from an apex to a rim, wherein a rotational axis central to the dome is aligned with the dome apex and wherein the rim of the dome is spaced from the rotational axis and comprises downwardly depending lobes spaced along the rim, the lobes extending distally of an equatorial plane of the dome aligned perpendicular to 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 rim thereof;
• d) at least two second cutting teeth, each second cutting tooth located on the rim and having 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 rim;
• and
• e) wherein the cutting radii and the hemispherical radii are each measured from a point where the rotational axis and the equatorial plane meet.

A surgical reaming system comprising:

• a) a driver having a proximal end connectable to a source of rotary power and a distal end;
• and
• b) a tool, which comprises:
• i) a hemispherical, hollow dome extending from an apex to a rim, wherein a rotational axis central to the dome is aligned with the dome apex and wherein the rim of the dome is spaced from the rotational axis and comprises downwardly depending lobes spaced along the rim, the lobes extending distally of an equatorial plane of the dome aligned perpendicular to the rotational axis;
• ii) at least one mounting bar extending perpendicular to the rotational axis with spaced apart ends secured to opposed locations of the dome, wherein the mounting bar is connectable to the distal end of the driver to provide the surgical reamer system;
• iii) a plurality of first cutting teeth arrayed along the dome, but spaced from the rim thereof;
• iv) at least two second cutting teeth, each second cutting tooth located on the rim and having 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 rim;
• and
• e) wherein the cutting radii and the hemispherical radii are each measured from a point where the rotational axis and the equatorial plane meet.

A surgical reaming system comprising:

• a) a driver having a proximal end connectable to a source of rotary power and a distal end;
• and
• b) a tool, which comprises:
• i) 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;
• ii) at least one mounting bar extending perpendicular to the rotational axis with spaced apart ends secured to opposed locations of the dome, wherein the mounting bar is connectable to the distal end of the driver to provide the surgical reaming system;
• iii) a plurality of first cutting teeth arrayed along the dome, but spaced from the equatorial rim thereof;
• iv) 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 the equatorial plane meet.