FIELD: mechanics; medicine for auto distraction systems. SUBSTANCE: unit includes ratchet wheel engageable with U-shaped member and rod. Transversal part of U- shaped member is articulated with vertical parts. Teeth of vertical parts are kept in engagement with teeth of ratchet wheel by means of spiral spring which is immovably connected with one vertical part of U-shaped member; it is connected with other part of U-shaped member for change in its tension by means of threaded rod fitted with nut. EFFECT: enhanced durability; possibility of controlling modes of operation. 2 cl, 1 dwg
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