Surgery – Instruments – Orthopedic instrumentation
Patent
1992-07-06
1995-10-31
Brown, Michael A.
Surgery
Instruments
Orthopedic instrumentation
606 81, A61B 1700
Patent
active
054625483
ABSTRACT:
An acetabular reamer is provided with a shaft having opposed front and rear ends. A mounting cap is securely connected to the front end of the shaft and includes a skirt having an interior surface spaced radially outwardly from the shaft and an opposed non-cylindrical exterior surface. At least one aperture extends through the skirt. A locking spring is disposed adjacent the interior surface of the skirt and includes a locking detent extending through the aperture in the skirt. The spring can be deflected radially inwardly to bring the detent into alignment with the exterior surface of the skirt. A reamer head is mountable over the mounting cap such that the rear wall of the reamer head deflects the spring radially inwardly during mounting and unmounting. In the fully mounted condition of the reamer head, the locking detent of the spring engages an inwardly facing surface of the rear wall of the reamer head. The.degree. acetabular reamer further includes a sleeve slidably and rotatably disposed around the shaft. The forward end of the sleeve can be gravitationally advanced into the annular space between the shaft and the skirt to prevent the inward deflection of the spring. Thus, the sleeve and the spring cooperate to prevent unintentional separation of the reamer head from the mounting cap.
REFERENCES:
patent: 2525669 (1950-10-01), Hainault
patent: 2842131 (1958-07-01), Smith
patent: 4528980 (1985-07-01), Kenna
patent: 4649919 (1987-03-01), Thimsen
patent: 4662891 (1987-05-01), Hoiles
patent: 4706659 (1987-11-01), Matthews
patent: 4782833 (1988-11-01), Einhorn
patent: 4803982 (1989-02-01), Baker
patent: 4856503 (1989-08-01), Schelhas
patent: 4951690 (1990-08-01), Baker
patent: 5007911 (1991-04-01), Baker
Buechel Frederick F.
Pappas Michael J.
Brown Michael A.
Casella Anthony J.
Hespos Gerald E.
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