Rotating constrained liner

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/34 (2006.01) A61F 2/32 (2006.01)

Patent

CA 2622769

An acetabular component for a prosthetic hip joint generally consists of an acetabular shell (60) and an acetabular liner (10). The acetabular liner includes a cup portion (11) and at least one constraining portion (14). The cup portion has a hemispherical or dome-shape that defines a hemispherical cavity (18) for receiving a femoral head (52) of a femoral component (50). The constraining portions may include extensions for retaining the femoral head in the cavity of the cup portion. The liner further includes cutout portions (19) between the constraining portions. The acetabular liner is rotatable within the acetabular shell to provide a complete range of motion to the femoral component without fear of impingement, subluxation, or dislocation of the femoral head. The constraining portions may include inclined surfaces to induce rotation of the acetabular liner within the acetabular shell.

La présente invention concerne un composant cotyloïdien, destiné à une prothèse d~articulation de la hanche, qui comprend en général une cupule cotyloïdienne (60) et un insert cotyloïdien (10). L~insert cotyloïdien se compose d~une partie coupelle (11) et d~au moins une partie de contrainte (14). La partie coupelle possède un hémisphère ou une forme de dôme qui définit une cavité hémisphérique (18) destinée à recevoir une tête fémorale (52) provenant d~un composant fémoral (50). Les parties de contrainte peuvent comprendre des extensions servant à retenir la tête fémorale dans la cavité de la partie coupelle. L~insert se compose également de parties découpées (19) disposées entre les parties de contrainte. L~insert cotyloïdien peut pivoter dans la cupule cotyloïdienne ce qui permet au composant fémoral de se déplacer sur tout son rayon d~action sans craindre de blocage, de subluxation ou de déboîtement de la tête fémorale. Les parties de contrainte peuvent comprendre des surfaces inclinées afin d~entraîner la rotation de l~insert cotyloïdien dans la cupule cotyloïdienne.

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