FIELD: medical engineering; orthopedics; traumatology. SUBSTANCE: distractor has threaded pair, nut of which is provided with cylindrical part installed in bushing secured to housing. Internal surface of bushing has grooves arranged equidistantly. It is provided with tangentially positioned hole in which spring-loaded pin is mounted for displacement. In addition, hollow housing may have base made in form of fork or it may be elongated. EFFECT: dosed microdistraction with extended limb and compression between bone fragments. 3 cl, 3 dwg
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