Surgery – Instruments – Orthopedic instrumentation
Patent
1997-11-03
1999-04-27
Dawson, Glenn K.
Surgery
Instruments
Orthopedic instrumentation
606 79, 606 80, 606 82, 606 83, A61B 1756
Patent
active
058975586
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. The projections can include snap-in projections that automatically lock in position or projections that can be twisted and locked into position. Alternatively, the base can comprise a pair of upper and lower plates with apertures in the upper plate such that when the blade projections mate with the apertures, riveting of the lower plate with respect to the upper plate locks the projections and their related blades into position on the base. When the reamer is assembled it has a hemispherical shape suitable for reaming the acetabulum of the hip so that the acetabular portion of a hip implant properly fits into the acetabulum.
REFERENCES:
patent: 4023572 (1977-05-01), Weigand et al.
patent: 4116200 (1978-09-01), Braun et al.
patent: 4621637 (1986-11-01), Fishbein
patent: 5755719 (1998-05-01), Frieze et al.
Abraham Thomas
Frieze Allan S.
Nalepa David
Case Medical, Inc.
Dawson Glenn K.
Ho Tan-Uyen T.
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