Thomas Abraham

US Patent:

58975586, Apr 27, 1999

Filed:

Nov 3, 1997

Appl. No.:

8/963059

Inventors:

Allan S. Frieze - Alpine NJ
David Nalepa - Jersey City NJ
Thomas Abraham - Rutherford NJ

Assignee:

Case Medical, Inc. - Ridgefield NJ

International Classification:

A61B 1756

US Classification:

606 81

Abstract:

An acetabular reamer includes a base, a first set of semi-circular blades attached to the base, and a second set of semi-circular blades also contacting the base, and crossing and intersecting with the first set of blades at right angles thereto. The base preferably includes a circular plate having a hexagonal drive hole in the center thereof and a plurality of slots in the periphery thereof for anchoring the blades. Each semi-circular blade includes a first end having a projection thereon, a second end opposite from said first end and also having a projection thereon, a first edge having serrated cutting teeth thereon, a second edge opposite from said first edge, and a first and second side surface. The cutting edge of the first set of blades includes a plurality of outwardly facing slots which mate with and engage a second set of inwardly facing slots in the second edge of said second blades. When the first and second set of blades are assembled in this fashion the cutting edges of both sets of blades lie in the same spherical plane.

US Patent:

57557195, May 26, 1998

Filed:

Jan 15, 1997

Appl. No.:

8/784005

Inventors:

Allan S. Frieze - Alpine NJ
David Nalepa - Jersey City NJ
Thomas Abraham - Rutherford NJ

Assignee:

Case Medical, Inc. - Ridgefield NJ

International Classification:

A61B 1756

US Classification:

606 81

Abstract:

An acetabular reamer includes a base, a first set of semi-circular blades attached to the base, and a second set of semi-circular blades also contacting said base, and crossing and intersecting with said first set of blades at right angles thereto. The base preferably comprises a circular plate having a hexagonal drive hole in the center thereof and a plurality of slots in the periphery thereof for anchoring the blades. Each semi-circular blade includes a first end having a projection thereon, a second end opposite from said first end and also having a projection thereon, a first edge having serrated cutting teeth thereon, a second edge opposite from said first edge, and a first and second side surface. The cutting edge of the first set of blades includes a plurality of outwardly facing slots which mate with and engage a second set of inwardly facing slots in the second edge of said second blades. When the first and second set of blades are assembled in this fashion the cutting edges of both sets of blades lie in the same spherical plane.