External fixation device for reducing bone fractures

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/64 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2448542

The invention relates to a novel type of an external fixation device having a carrying structure (1; 40) of inter- connected elements (2, 5, 6) comprising an extendible central body (2), and clamps (5, 6) for bone screws respectively articulated on opposed ends (3, 4) of the central body (2), said central body comprising two parts (8, 9) telescoping slidable one on the other, each of said parts (8, 9) including a first portion (8a; 9a) of elongate shape formed integrally with a second end portion (8b; 9b) of substantially cylindrical shape, said first portions (8a, 9a) of the parts (8, 9) being slidably coupled to each other by means of a driving groove (7) formed longitudinally in one the first portion (8a) and a corresponding slide (7a) formed longitudinally in the other first portion (9a) and means being provided in said parts (8, 9) for stopping their sliding movement characterized in that it further comprises at least one plate (27; 41; 42; 43; 60) having predetermined contour shape and thickness, at least one recess (28; 44; 47; 51) formed on the surface of at least one of the interconnected elements (2, 5, 6) and having its contour shape matching the contour shape of said at least one plate (27; 41; 42; 43; 60), and means (30, 31; 46, 46a; 49, 50 53, 54) for releasably securing said at least one plate (27; 41; 42; 43; 60) in said at least one recess (28; 44; 47; 51).

L'invention concerne un dispositif de fixation externe à structure support (1; 40) constituée d'éléments interconnectés (2, 5, 6) comprenant un corps central extensible (2), et à brides (5, 6) pour broches respectivement articulées aux extrémités opposées (3, 4) du corps central (2), lequel comprend deux parties (8, 9) coulissant de façon télescopique l'une sur l'autre; chaque partie (8, 9) comporte une première zone (8a; 9a) allongée intégrée à une seconde zone terminale (8b; 9b) sensiblement cylindrique. Lesdites premières zones (8a, 9a) des parties considérées (8, 9) sont mutuellement couplées coulissantes au moyen d'une rainure d'entraînement (7) d'extension longitudinale, dans l'une des premières zones (8a), et d'un élément coulissant correspondant (7a) d'extension longitudinale, dans l'autre première zone (9a). Un système est prévu dans les parties en question (8, 9) pour interrompre le mouvement coulissant; ce système comprend au moins une plaque (27; 41; 42; 43; 60) à contour et épaisseur préétablis, au moins une cavité (28; 44; 47; 51) à la surface d'au moins un des éléments interconnectés (2, 5, 6), dont le contour épouse celui de la ou des plaques (27; 41; 42; 43; 60), et un système (30, 31; 46, 46a; 49, 50 53, 54) permettant de fixer libérable(s) ladite ou lesdites plaques (27; 41; 42; 43; 60) dans la ou les cavités (28; 44; 47; 51).

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