| 摘要 |
The present patent of invention that refers to a bone plate screw fixation. It refers to a system comprising a screw (3) and a plate (1) for bone synthesis, wherein the screw (3) after being placed in the bone in the final tight will stay blocked on the plate (1) whether using the lock ring (2) or not. On A Version (FIG. 1) the system will be comprised by screw (3), plate (1) and lock ring (2). The screw (3) has its conical head that may receive a thread or not. The ring (2) has in its internal outline a cone that may have a thread to receive the screw (3) or not. Outside the lock ring (2) there is a spherical surface that will connect to the plate (1), which will fix the set when tightened; this ring is cut so that it can be expanded. The plate (1) has its spherical hole similar to ring's outward to receive the set (2) and (3) where the block will occur. However, on B Version (FIG. 2) the screw (3) may be placed on the plate (5) even without the lock ring following the screw (3) thread outline (4).
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