FIELD: medical engineering; surgery. SUBSTANCE: tip piece comprises tubular element for blood intake and communicated with its interior space, another tubular element for anticoagulation supply. Blood intake tubular element is arranged coaxially within anticoagulant supply tubular element so as to form annular channel between them. Blood intake tubular element is shorter than anticoagulant supply by 0.1 to 10 mm. EFFECT: improved design. 1 dwg
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