Osteosynthesis device with rapid fixing means

An osteosynthesis device comprising a plate (10) of thickness between 3 mm and 7 mm that can extend along a piece of bone and fixing means for holding a pin (20) of diameter between 0.8 mm and 5.0 mm through said plate, said pin (20) being screwable into said piece of bone, said plate (20) having a recess (12) of diameter between 2.5 mm and 15 mm made in its thickness to accept said fixing means, said recess defining a closed inner edge (22), said fixing means comprising a ring (14) intended to accept said pin (20), said ring (14) being designed to engage with said inner edge (22) and said fixing means further comprising screwable locking means (32) to lock said pin (20) in a fixed position with respect to said plate (10);

• characterized in that said plate (10) has two diametrically opposed threaded openings (26, 28) made at the margins of said recess (12) so as to exhibit two axial apertures (30, 31) opening into said inner edge (22), while said ring (14) is radially split so as to be diametrically compressible;
• and
• in that said screwable locking means comprise a screw (32) intended to be screwed through said threaded opening (26) to press against said ring (14) through said axial aperture (30, 32) and cause both said ring (14) to be pressed forcibly against a portion of said inner edge (22) diametrically opposite said threaded opening (26), and said ring (14) to tighten onto said pin (20), by virtue of which said pin (20) is held in a fixed position with respect to said plate (10).