A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/34 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01)
Patent
CA 2052978
ABSTRACT The present invention relates to a hip-joint socket of spherical geometry that can be screwed into place, this having a special thread for cementless implantation, and a process for the production of this. In its shape, the special thread follows the convex surface formed by the nominal diameter of the socket and its bottom is almost completely matched to this spherical surface. According to the present invention, the production of the special thread by metal-cutting methods is effected by machining with several tools having different cutting edge angles relative to the thread bottom, which are moved on different paths. Because of the thread shape according to the present invention, a significantly higher primary fixation during implantation is achieved as a result of the thread tooth height that is available, and at the same time, the danger of loosening has been considerably reduced by the fact that because of the complete and large area bone contact of the socket surface, only low specific forces act on the bone bed.
Hoermansdorfer Gerd
Johnson & Johnson Medical Gmbh
Smart & Biggar
LandOfFree
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