FIELD: medical engineering. SUBSTANCE: device has ring pairs with spoke holders and crossed spokes, rods with toothed threading and guides with springy plates engageable with the rod teeth to enable advance and check of the rings. The rods are connected to the rings through the guides. The device is provided with nuts mounted on rods and being in engagement with rings for rigidly fixing the rings. The rods are threaded and have longitudinal parallel flats. The rings are detachable with flattened butt-joining ends and cuts for rods. The cut width is equal to rod cross-section width between its flats. The guides are bushings mounted on rods to be engageable with the rings. EFFECT: wide range of applications. 5 dwg
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