Surgery – Instruments – Orthopedic instrumentation
Patent
1994-05-23
1995-07-11
Graysay, Tamara L.
Surgery
Instruments
Orthopedic instrumentation
606 99, A61F 246, A61B 1788, A61B 1792
Patent
active
054316570
ABSTRACT:
An instrument 2 used to install both the outer shell 40 and bearing liner 50 of a conventional acetabular cup assembly 4. Instrument 2 includes an impactor 30 and a reversible cup or head component 10, which is adapted for driving shell 40 into the acetabulum and for seating bearing liner 50 into the shell. Head component 10 has a rounded semi-spherical surface 12 on one end and a substantially flat surface 14 on the opposite end. Impactor 30 includes a longitudinal extension 36 which can be inserted into a bore 20 in head component 10 from either direction to secure the head component to the impactor. When instrument 2 is used to seat shell 40 into the acetabulum, head component 10 is fitted to impactor 30 with semi-spherical surface 12 facing outward for abutment against inner surface 44 of shell 40. Shell 40 is connected to the distal end 39 of extension 36, which protrudes from semi-spherical surface 12 of head component 10. When instrument 2 is used to seat bearing liner 50 into shell 40, head component 10 is connected to impactor 30 with flat surface 14 facing outward for abutment against bearing liner 50.
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Dawson Todd A.
Graysay Tamara L.
Markow Scott B.
Zimmer Inc.
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