Screw

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/86 (2006.01) F16B 35/04 (2006.01)

Patent

CA 2574838

The invention relates to a screw (1) comprising a head-side end (5), a tip (6), a screw core (3) comprising an envelope surface (14) carrying an outer thread (7), and a central line (4) formed by the connection line of the centres of gravity of the axially successive, orthogonal cross-sectional surfaces of the screw core (3), without taking into account any cavities (13). The screw core (3) comprises at least one cavity and the central line is not straight. The material weakening of the screw core (3), caused by the cavities (13), simplifies the passage thereof through a narrow point, e.g. in a transversal borehole of an intramedullary nail (10), as the screw (1) without a straight central line can be radially deformed to a certain degree.

L'invention concerne une vis (1) comportant une extrémité côté tête (5), une pointe (6), et un noyau de vis (3) présentant la surface d'enveloppe (14), portant un filet extérieur (7) ainsi qu'une ligne centrale (4) formée par la ligne de liaison des centres de gravité des surfaces de section transversale orthogonales, axialement consécutives, du noyau de vis (3), sans prise en compte de cavités éventuelles (13). Le noyau de vis (3) présente une ou plusieurs cavités et la ligne centrale n'est pas droite. La diminution matérielle du noyau de vis (3), due aux cavités (13), permet d'en faciliter la progression au travers d'un rétrécissement, par exemple dans un alésage transversal d'un clou à moelle (10), du fait que la vis (1) ne présentant par de ligne centrale droite peut être déformée radialement jusqu'à un degré donné.

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