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Machine translation
1. (WO1979000739) IMPROVED JOINT ENDOPROSTHESIS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000739    International Application No.:    PCT/US1979/000147
Publication Date: 04.10.1979 International Filing Date: 09.03.1979
IPC:
A61F 2/38 (2006.01), A61F 2/42 (2006.01), A61F 2/00 (2006.01), A61F 2/30 (2006.01)
Applicants:
Inventors:
Priority Data:
885273 10.03.1978 US
Title (EN) IMPROVED JOINT ENDOPROSTHESIS
(FR) AMELIORATIONS AUX ENDOPROTHESES DES ARTICULATIONS
Abstract: front page image
(EN)Joint endoprosthesis for the total replacement of degenerate joints such as the andle, knee, elbow, wrist and finger. When embodied as an ankle endoprosthesis (10), the device comprises a tibial component (11) which provides a first bearing surface (21a); a talar component (13) which provides a second bearing surface (34) which is at least a segment of a surface of revolution about a first axis (2); and a tibial insert (12) intermediate the tibial and talar components (11 and 13) which provides a third bearing surface (26a) which provides area contact with the first bearing surface (21a) to permit relative rotation between the tibial component (11) with respect to the tibial insert (12) and the talar component (13) about a second axis (1) that is substantially parallel to the shaft of the tibia and which relative rotation provides one of only two degrees of freedom of rotational movement of said tibia with respect to said talus, and wherein the tibial insert (12) is further provided with a fourth bearing surface (29) in area contact with the second bearing surface (34) that is in sliding engagement therewith to permit relative rotational movement of the tibial component (11) and tibial insert (12) with respect to the talar component (13) about the first axis (2) which relative rotation thereby provides the second of only two degrees of freedom of rotational movement of said tibia with respect to said talus. The joint endoprosthesis overcomes the problem of poor wear characteristics on parts due to high stresses and pressures resulting from normal joint loads and avoids bone fushion techniques.
(FR)Endoprothese des articulations pour remplacer totalement des articulations atteintes de degenerescence telles que chevilles, genoux, coudes, poignets et doigts. Lorsqu"il s"agit d"une endoprothese de cheville (10), le dispositif comprend un composant tibial (11) qui procure une premiere surface d"appui (21a), un composant talaire (13) qui procure une seconde surface d"appui (34) qui est au moins une partie d"une surface de rotation autour d"un premier axe (2) et un insert tibial (12) intermediaire entre le composant tibial (11) et le composant talaire (13) qui procure une troisieme surface d"appui (26a) ayant une zone de contact avec la premiere surface d"appui (21 a) pour permettre une rotation relative entre le composant tibial (11) par rapport a l"insert tibial (12) et le composant talaire (13) autour d"un second axe (1) qui est substantiellement parallele a l"axe du tibia, cette rotation relative n"assurant qu"un seul des deux degres de liberte du mouvement rotatif dudit tibia par rapport audit talon; de plus, l"insert tibial (12) possede une quatrieme surface d"appui (29) ayant une zone de contact avec la seconde surface d"appui (34) par coulissement pour permettre le mouvement de rotation relatif du composant tibial (11) et de l"insert tibial (12) par rapport au composant talaire (13) autour du premier axe (2), cette rotation relative assurant le second des deux seuls degres de liberte du mouvement rotatif dudit tibia par rapport audit talon. L"endoprothese d"articulation surmonte le probleme pose par les mauvaises usures de certaines parties dues aux grandes forces et pressions produites par les charges normales des articulations et evite d"avoir recours aux techniques de fusionnement des os.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)