A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/34 (2006.01)
Patent
CA 2560239
A prosthetic flexible bearing element cup or cup bearing liner adapted for use with a part-spherical bearing head Which includes an inner bearing surface which has a first portion which is substantially part-spherical about a hemispherical centre located on a main loading axis, and a second portion at least part of which is relieved with respect to the first portion and which over said relieved part has a radial distance (d) from the hemispherical centre which increases from an inner end towards an outer end as the angle of rotation (8) about the hemispherical centre increases towards the rim of the cup, characterised in that the distance of the relieved part of the surface of the second portion from a line representing the shape of the outer surface of the part-spherical bearing head when located on said main loading axis and bearing against said first portion of the inner bearing surface at any given radial distance (d) is determined by the formula Where d - a (e .theta. .In b - 1) d is the radial distance in millimetres between the line representing said shape of the outer surface of the part-spherical bearing head When located on said first portion of the inner bearing surface and with its centre located on said hemispherical centre and the relieved part of the second portion .theta.is the angle in degrees about the hemispherical centre, and a and b are values determined by selecting angle an (.theta.1) and a distance (d1) at or towards said inner end of the second portion and placing them in said formula, selecting an angle (.theta.2) and a distance (d2) at or towards the outer end of second portion adjacent the rim and placing them in the formula and solving the two equations together.
Benoist Girard Sas
Smart & Biggar
LandOfFree
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