FIELD: medical engineering. SUBSTANCE: device has casing connectable to cannula or needle at the distal end by means of cylindrical coupling member. Sensitive pressure pickup, unit for processing signal emitted by the signal-emitting unit pickup and electric power supply source are set into the casing. The pressure pick-up responses to pressure changes from the moment blood enters the needle. Photodetector or Takoe unit is usable as signal-emitting unit. EFFECT: enhanced reliability of operation. 4 cl, 3 dwg
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