| 摘要 |
A system (100) for lockably engaging bone screws into a fixation plate may include a locking fixation plate (300) including a threaded screw hole (302) defined by an inner surface surrounding the threaded screw hole, the inner surface comprising an upper countersink (310a) and a threaded portion (307), the threaded portion comprising a pair of threads arranged in a double helix configuration, and a screw (200) comprising a generally conical head (202) tapering into a generally cylindrical shaft (204) that ends at a tip (206) and a single thread (208) beginning near the tip and extending along the generally cylindrical shaft and onto the generally conical head, a thread height of the single thread being constant over a majority of the generally cylindrical shaft and tapering as the thread extends onto the head.
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