FIELD: medicine. SUBSTANCE: distractor has threaded rod and distraction mechanism. Threaded rod is composed of guide and slide aligned with one another in dovetail manner. Distraction mechanism is made in the form of drive screw mounted in threaded opening along central axis of rod between supporting projections in guide slot. EFFECT: increased efficiency by dosed reposition of offset vertebrae for retaining thereof in required position and reduced disturbing operative effect. 5 dwg
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