Improved floating bearing prosthetic knee

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/30 (2006.01) A61F 2/38 (2006.01)

Patent

CA 2078228

A semiconstrained prosthetic knee for surgical replacement of a dysfunctional knee includes a tibial platform (22), a movable bearing element (16), and a femoral component (12). The femoral component (12) includes a polycentric convex bearing which slidably engages a movable bearing (16). The superior surface of the bearing element (16) is designed to congruently slidably engage the inferior surface of the bearing portion of the femoral component (12). The inferior surface of the femoral component (12) is generally convex with two or more offset portions of varying radii of curvature matching complementary superior surfaces of the bearing element (16). The inferior surface of the femoral component (12) may have more than one radius of curvature at different points along the convex surface. The superior surface of the tibial platform (22) is generally flat and includes at least one protrusion for controlling the movement of the bearing element (16).

L'invention se rapporte à une prothèse de genou semicontrainte, qui sert à remplacer par une opération chirurgicale l'articulation défectueuse d'un genou et qui comprend une plateforme tibiale (22), un organe d'appui mobile (16) et un élément fémoral (12). L'élément fémoral (12) comporte un palier convexe polycentrique qui est en contact coulissant avec un palier mobile (16). La surface supérieure de l'organe d'appui (16) est conçu de façon à entrer en contact coulissant avec la surface inférieure de la partie d'appui de l'élément fémoral (12) pour coïncider avec cette surface. La surface inférieure de l'élément fémoral (12) est généralement convexe et comporte au moins deux parties décalées de rayons de courbure variables, s'adaptant aux surfaces supérieures complémentaires de l'organe d'appui (16). La surface inférieure de l'élément fémoral (12) peut présenter plus d'un rayon de courbure en différents points le long de la surface convexe. La surface supérieure de la plateforme tibiale (22) est généralement plate et présente au moins une saillie permettant de commander le déplacement de l'élément d'appui (16).

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