FIELD: surgical operations. SUBSTANCE: two external and internal coaxial tubes designed to feed anticoagulant and to select blood are interconnected by internal cavities. Rod which forms fixed bend of endpiece is made flexible and positioned along endpiece length in diametrical clearance between tubes for interaction with internal wall of external tube at bend. Rod thickness does not exceed diametrical clearance width. Tubes are made flexible. EFFECT: improved design. 1 dwg
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