| 摘要 |
This implantable orthopedic device comprises a support structure (2) provided with an orifice (3) delimiting a receiving housing (5) for a nut (6) intended to cooperate with a fixing screw (4). The housing (5) comprises an upper part (5a) and a lower part (5b), both parts being generally truncated sphere shaped and concentric to each other. On the other hand, the nut (6) comprises a peripheral contour (11) and the screw head (15) comprises a lower part (15b), also having a spherical contour, as well as an upper part (15a) provided with a thread (17). The upper (15a) and lower (15b) parts of the screw head (15) cooperate with the mating thread (14) of the nut (6) and with the lower part (5b) of the receiving housing (5), respectively, so as to tend, during the final screwing step, to separate said nut (6) from the part (5b) of the housing (5), and then entail the forced rest—of the peripheral contour (11) of the nut (6) against the spherical upper part (5a) of the housing (5) and—of the lower part (15b) of the screw head against the spherical lower part (5b) of the housing (5).
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