A cup component of an orthopaedic joint prosthesis

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/34 (2006.01)

Patent

CA 2718807

A cup component of an orthopaedic joint prosthesis comprises a hollow shell in which the head part of a mating component of the joint can be received. The shell has a flange at its open face extending around at least part of its periphery with at least two major threaded bores extending through the flange. The flange also provides at least one minor threaded bore, in which the diameter of the minor bore is less than that of the major bores and the pitch of the thread in the minor bore is less than that of the thread in the major bores. The cup component includes at least two fixation screws whose shanks have approximately equal diameters, each of which is threaded on its external surface (i) to engage the thread a respective one of the bores in the shell flange, and (ii) to threadingly engage the bone, and a temporary screw having a self-drilling tip for forming a bore in a bone, and a diameter and a thread which are suitable for threadingly engaging the thread in the minor bore.

L'invention porte sur un composant de cupule d'une prothèse articulaire orthopédique qui comprend une coque creuse dans laquelle la partie de tête d'un composant d'appariement de l'articulation peut être reçue. La coque a un rebord au niveau de sa face ouverte s'étendant autour d'au moins une partie de sa périphérie avec au moins deux alésages filetés majeurs s'étendant à travers le rebord. Le rebord fourni également au moins un alésage fileté mineur, le diamètre de l'alésage mineur étant inférieur à celui des alésages majeurs et le pas du filetage dans l'alésage mineur étant inférieur à celui du filetage dans les alésages majeurs. Le composant de cupule comprend au moins deux vis de fixation dont les tiges ont des diamètres approximativement égaux, dont l'un est fileté sur sa surface externe (i) pour engager le filetage d'un alésage respectif parmi les alésages dans le rebord de coque, et (ii) pour engager par filetage l'os, et une vis temporaire ayant un embout autoperceur pour former un alésage dans un os, et un diamètre et un filetage qui sont appropriés pour engager de façon filetée le filetage dans l'alésage mineur.

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