Surgical milling cutter and blades for such a cutter

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/16 (2006.01) A61B 17/00 (2006.01)

Patent

CA 2629739

This milling cutter is composed of four blades (la, 1b, 1c, 1d) cut out, preferably by die-stamping, from sheets of soft metal, for example stainless steel. The blades have slits (13, 15) that allow them to be inserted into one another in such a way as to obtain a cutter head. The slits have different widths, which allows them to be assembled on the rotation shaft in a number greater than two. Each blade is continued by a lower part (12). These lower parts are engaged in a flat ring (7) that keeps the assembly rigid. Two of the blades each have two lateral extensions (2) that are cut out from the blade itself and are situated in the lower part (12)of the blade. These lateral extensions are designed in such a way as to permit their insertion in notches (3) of conventional bayonet-type cutter spindles, thereby avoiding the need for an intermediate tool.

Cette fraise est constituée de quatre lames (la, 1b, 1c, 1d) découpées de préférence par étampage dans des feuilles de métal non dur, par exemple de l'acier inoxydable. Les lames présentent des fentes (13, 15) qui permettent de les insérer l'une dans l'autre de façon à obtenir une tête de fraise. Les fentes ont des largeurs différentes, ce qui permet de les assembler sur l'axe de rotation en un nombre supérieur à deux. Chaque lame est prolongée par une partie inférieure (12). Ces parties inférieures sont chassées dans un anneau plat (7) qui tient l'ensemble rigide. Deux des lames présentent chacune deux extensions latérales (2) découpées dans la lame elle-même et situées dans la partie inférieure (12) de la lame. Ces extensions latérales sont conformées de façon à permettre leur insertion dans des crans (3) de porte-fraises à baïonnette classiques, en évitant la nécessité d'un outil intermédiaire.

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