Surgery – Instruments – Orthopedic instrumentation
Patent
1996-02-08
1997-12-02
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606180, A61B 1716
Patent
active
056930470
ABSTRACT:
Abstract of the Disclosure Intramedullary reamers are well known in orthopaedic procedures for reaming out a tubular passage within a bone for accommodating an implant such as a femoral nail. The reamer head of this invention is designed to accommodate a press fit connection to a reamer shaft. Heretofore, such press fit connections placed a hoop stress on the neck of the shaft such that the hoop stress significantly exceeded the yield strength of the material. Therefore in such prior art heads, the neck of the head would begin to crack adjacent the opening of the neck. The reamer head of this invention substantially reduces the hoop stresses on the neck of the head at its opening and provides for a smoother transition of stresses along the neck by forming a counter bore through the neck while maintaining a satisfactory press fit connection between the head and the shaft.
REFERENCES:
patent: 726388 (1903-04-01), Wysong
patent: 2325691 (1943-08-01), Litwin et al.
patent: 3321209 (1967-05-01), Sanders
patent: 4509887 (1985-04-01), Hofling
patent: 5499984 (1996-03-01), Steiner et al.
Bryant Mark
Meyers John
Toone James R.
Buiz Michael
Dawson Todd A.
Reip David O.
Zimmer Inc.
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