Anti-retreating bone screw capable of being opened

Abstract

The utility model discloses a distractable anti-retreat bone screw which comprises an expansion screw and a distracting anti-retreat core rod which are in threaded connection, a distracting opening is formed in the inner end of the expansion screw, a plurality of cutting grooves are formed in the end, close to the distracting opening, of the expansion screw, a distracting piece is arranged at the end of the distracting anti-retreat core rod, and the distracting piece is connected with the distracting anti-retreat core rod. The expanding piece is arranged in the expanding opening in a penetrating mode so that the outer end of the expansion screw can be expanded, an anti-retreating clamping piece is arranged at the end of the expanding piece, and the anti-retreating clamping piece is connected to the end of the expansion screw in a clamped mode. The problems that an existing screw is disengaged, the fixing effect fails, and life safety of a patient is endangered can be solved.

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