Multiple diameter tangential set screw

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/84 (2006.01) A61B 17/56 (2006.01) A61B 17/68 (2006.01) A61B 17/70 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2483626

A multiple diameter tangential set screw (1) particularly for securing a rod (4) within a hook shaped rod receiver (11) includes a threaded mounting segment (25), a threaded rod engaging segment (27), and an abutment surface (29) at a transition between the mounting segment (25) and the rod engaging segment (27). The mounting segment (25) has a larger diameter than the rod engaging segment (27) and is received in a threaded bore (22) formed in the rod receiver (11). The abutment surface (29) has a concavely radiused surface of revolution. The rod engaging segment (27) is positioned so that threads of the rod engaging segment (27) cut into the surface of the rod (4) to secure the rod (4) from rotational movement. Engagement of the rod engaging segment (27) and the abutment surface cooperate to urge the rod (4) into frictional engagement with the rod receiver (11) and to secure it from axial, radial and rotational displacement relative to the rod receiver (11).

L'invention concerne un boulon de fixation tangentiel à plusieurs diamètres (1), destiné en particulier à fixer une tige (4) à l'intérieur d'un récepteur de tige en forme de crochet (11), comprenant un segment de montage fileté (25), un segment d'engagement de tige fileté (27), et une surface de butée (29) située entre le segment de montage (25) et le segment d'engagement de la tige (27). Le segment de montage (25) possède un diamètre plus grand que celui du segment d'engagement de tige (27), ce diamètre étant reçu dans un alésage fileté (22) formé dans le récepteur de tige (11). La surface de butée (29) est constituée d'une surface de révolution de rayon concave. Le segment d'engagement de tige (27) est positionné de façon que les filets de ce segment (27) découpent la surface de la tige (4) afin d'empêcher cette tige (4) de tourner. L'engagement du segment d'engagement de tige (27) et la surface de butée coopèrent afin de forcer la tige (4) à rentrer dans un engagement de frottement avec le récepteur (11) et d'empêcher ainsi tout déplacement axial, radial et rotationnel de la tige (4) par rapport au récepteur (11).

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