Patent ID: 8114139

Claim:
An osteosynthesis plate ( 1 ), comprising: receiving holes ( 2 ) configured for screws ( 3 ) or similar fixing bodies; and means for blocking ( 4 b , 5 , 6 ) of at least one screw ( 3 ) as regards extraction with respect to the hole ( 2 ) receiving this screw ( 3 ), wherein said means for blocking comprise: a plurality of slots, each slot ( 5 ) comprising a first portion opening into the hole ( 2 ) and developed radially in relation to the hole ( 2 ) a second portion extending over a section of the hole ( 2 ), at a distance from an edge defining the hole ( 2 ), the slot ( 5 ) thereby isolating a portion of material ( 6 ); said second portion of the slot ( 5 ) has, on a side of the first portion of the slot ( 5 ), a first area of a radially reduced thickness and, on a side opposite the first portion of the slot ( 5 ), a second area of a radially greater thickness, such that said portion of material ( 6 ) itself has, on the side of said first portion of the slot ( 5 ), a first part ( 6 a ) with a radially increased thickness and, on the side opposite said first portion of the slot ( 5 ), a second part ( 6 b ) having a radially reduced thickness; the second part ( 6 b ) has a thickness such that the portion of material ( 6 ) may be radially mobile between a withdrawn position, in which the portion of material ( 6 ) does not extend above a surface of the hole ( 2 ), and an active position, in which the portion of material extends partially over the area so as to axially block a screw in the hole ( 2 ); and a plurality of pads, each pad ( 4 b ) engaged in said slot ( 5 ), said pad having a thickness smaller than that of the second area but greater than that of the first area, able to be slidingly moved along said second portion of said slot, from said second area toward said first area in such a way as to bring said portion of material ( 6 ) from its withdrawn position to its active position, wherein the pads ( 4 b ) of the different slots ( 5 ) are connected to each other by a ring configured to be placed coaxially in relation to the hole ( 2 ).