Improved osteotome

Details Improved osteotome Improved osteotome

A - Human Necessities

61

B

A61B 17/14 (2006.01) A61B 17/16 (2006.01) A61B 17/32 (2006.01)

Patent

CA 2590344

A tool (1, 31) for cutting bone comprises an elongate blade (7, 37) connectable to a generator of longitudinal-mode ultrasonic vibrations. The blade (7, 37) has two lateral cutting edges (9, 10) linked by a rounded distal tip (8). A series of triangular teeth (13) extends along each cutting edge (9, 10) and the distal tip (8). The blade (37) may taper towards each cutting edge (9,10) and the distal tip (8). A variant of the tool (21) comprises an elongate part-cylindrical blade (27) connectable to a generator of torsional- mode ultrasonic vibrations. The blade (27) has a cutting edge at its distal tip (28) provided with a plurality of triangular teeth (23). All forms of the tool (1, 21, 31) are particularly suitable for cutting cancellous bone around an implant to be removed during revision of a joint arthroplasty.

La présente invention concerne un outil (1, 31) pour couper les os, comprenant une lame allongée (7, 37) pouvant être connectée à un générateur de vibrations ultrasonores en mode longitudinal. La lame (7, 37) comporte deux bords tranchants latéraux (9, 10) reliés par une pointe distale arrondie (8). Une série de dents triangulaires (13) s~étend le long de chaque bord tranchant (9, 10) et de la pointe distale (8). La lame (37) peut se réduire progressivement vers chaque bord tranchant (9, 10) et la pointe distale (8). Une variante de l~outil (21) comprend une lame partiellement cylindrique allongée (27) pouvant être connectée à un générateur de vibrations ultrasonores en mode de torsion. La lame (27) comporte un bord tranchant au niveau de sa pointe distale (28), muni d~une pluralité de dents triangulaires (23). Toutes les formes de l~outil (1, 21, 31) sont particulièrement appropriées pour couper des os spongieux autour d~un implant à enlever lors de la révision d~une arthroplastie articulaire.

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