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US 6,146,425 AGranted
Hip joint glenoid cavity with a special thread
OwnerGerd Hoermansdoerferinventor
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OwnerGerd Hoermansdoerferinventor
Estimating the term…
The invention concerns a screw-in type artificial hip joint socket with a special thread for implantation in human beings. Hip joint sockets of this type usually have a flat thread with parallel teeth flanks or a triangular thread with a neutral teeth position, the axial pitch being conventionally constant. However, such embodiments are unfavourable because they do not take sufficiently into account the forces which arise during implantation as well as during the intended use, or they cause an unnecessarily extensive bone bed destruction during an eventually required explantation. With the invention a purposefully optimization of the hip joint socket thread is provided, wherein the thread profile, the angular orientation of the thread teeth and a non-linear thread pitch is utilized, in order to ensure an effortless screwing, a stable seat in the long term and an unproblematic explantation (FIG. 3).
Screw-in type artificial hip joint socket comprising a shell body having an outer surface, said outer surface having a threaded portion provided thereon with a self-tapping threading for screwing into the acetabulum along a socket axis, said outer surface exhibiting a progressive or stepwise resolved curvature within said threaded portion, said threading having helical cutting grooves and/or a thread tooth profile tilted away from a plane radial to said socket screw-in axis, wherein said the thread has a pitch that varies relative to said socket axis depending upon:
Dependencies are inferred from the claim text.