Orthopedic prosthesis having anti-backout screw

Details Orthopedic prosthesis having anti-backout screw Orthopedic prosthesis having anti-backout screw

1998-01-23

2000-07-11

Milano, Michael J.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

623 18, A61F 238, A61F 230

Patent

active

060866144

ABSTRACT:
An implantable orthopedic prosthesis includes a screw having a threaded shank and a head. The head includes a plurality of splines extending outwardly of the diametrical extent of the head. A first implantable prosthetic element has a threaded bore for receiving the threaded shank of the screw in threaded engagement. A second implantable prosthetic element has a shoulder-stepped bore for receiving the threaded shank therethrough and for engaging the head. The bore includes an annular groove for receiving the splines of the head and defines a shoulder for engaging the splines to prevent backout of the screw.

REFERENCES:
patent: 4640271 (1987-02-01), Lower
patent: 4672979 (1987-06-01), Pohndorf
patent: 5683472 (1997-11-01), O'Neil et al.
patent: 5766255 (1998-06-01), Slamin et al.
patent: 5879389 (1999-03-01), Koshino

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