FIELD: medical engineering. SUBSTANCE: device has thread produced with one or more screw grooves on the surface of piston rod 1, the mentioned grooves transforming into longitudinal grooves 4. Nut member 6 is engageable with thread and at least one projection 8 directed inward. Projection or projections 8 guide traveling piston rod in groove or grooves forming the thread. EFFECT: enhanced reliability of operation. 7 cl, 6 dwg
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