| 摘要 |
<p>Bone implantation screw (1) incorporates a considerably spherical head (2) provided with a blind axial orifice (3), which allows screwing onto the bone with an Allen type wrench, screw head (2) aided by an anchor plate (4) provided with an orifice (6) with a diameter greater than that of head (2), framed by a tronco-conical narrowing (5) on which rests an open washer (10) which, due to the axial pressure of an inner bushing (11) strangles the lower end of screw head (2), thereby locking it onto the anchor plate. Said anchor plate is provided with upper grooves (7) for implanting bar (8) which links the screws, which bar is permanently fixed by a second bushing (14) and a threaded plug (15) which is threaded on the inside (9) of anchor plate (4) and which generates the required axial pressure to strangle washer (10) and immobilise bar (8). <IMAGE></p> |
