Improved kit (1) for orthopedics, preferably for osteosynthesis, comprising an internal mechanical fixing system (2) which includes a plate (4) to be mounted straddling two bone fragments to be joined (7', 7") and at least two, preferably at least four, fixing screws (5) for fixing the plate to said two bone fragments (7', 7"), in said implant : - said plate (4) consists of a plate made of biocompatible metal material and has a thickness of about 0.5 - 4mm, said plate (4) being provided with at least two, preferably at least four, conical through holes (8) whose inner walls (9) are obtained with at least one surface finishing mechanical operation, each of said at least two fixing screws (5) has a head (11) and a self-tapping stem (13), and characterized in that each of said at least two fixing screws (5): comprises a conical collar (10) which is interposed between said head (11) and said self-tapping stem (13) and is configured to define a conical coupling within a corresponding conical through hole (8) of the plate (4), the head (11) presenting on its upper surface a recessed and shaped mark (15) for the coupling by the, at least partial, shape coupling, of the tip (32) of a screwing tool (31) and said head (11) also presenting on its external side wall (14) a thread (16) for the engagement of a gripping tool (35), it is configured so that, when its conical collar (10) is inserted into a corresponding conical through hole (8) of the plate (4), said head (11) protrudes outwards with respect to said plate (4).L'invention concerne un kit (1) amélioré pour l'orthopédie, de préférence pour l'ostéosynthèse, comprenant un système de fixation mécanique interne (2) qui comprend une plaque (4) à monter en chevauchement sur deux fragments d'os à assembler (7', 7") et au moins deux, de préférence au moins quatre, vis de fixation (5) pour fixer la plaque auxdits deux fragments d'os (7', 7"), dans ledit implant : - ladite plaque (4) consiste en une plaque en matériau métallique
