| 摘要 |
A screw anchor having a deformable central portion in which are formed four main longitudinal slots defining in pairs on the central portion respective deformable main longitudinal tongues; the screw anchor also having a number of secondary longitudinal slots; and each secondary longitudinal slot defines, on the central portion and with an adjacent main longitudinal slot and/or an adjacent secondary longitudinal slot, respective deformable secondary longitudinal anchoring tongues.
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