| 摘要 |
A tulip assembly configured to be coupled to a head of a bone fixation device includes an inner tulip member including a lower portion configured to couple the head of the bone fixation device and an upper portion including a plurality of flexible protrusions extending from the lower portion. In one embodiment, the plurality of flexible protrusions are configured to provisionally couple a rod. The tulip assembly also includes an outer tulip member including first and second positions, the former being configured to enable an expansion of the lower portion of the inner tulip member and the latter being compressible locking the lower portion of the inner member on the bone fixation device. The tulip assembly also includes a cap and at least one locking member, wherein the at least one locking member is configured to compress the flexible protrusions to securely lock the rod within the tulip assembly.
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