Change -blood bloodletting instrument

The utility model discloses a change -blood bloodletting instrument, including keeping somewhere needle, blood counter and aspirator pump, keep somewhere the needle and pass through blood transfusion tube and blood counter top intercommunication, blood counter surface is provided with the scale, and blood counter bottom is provided with the through -hole, through -hole department is provided with ventilative water proof membrane, the aspirator pump passes through gas flow tube and through -hole intercommunication. The change -blood bloodletting instrument of this structure can precise measurement volume of drawing blood, greatly reduced medical risk. 本实用新型公开了种换血抽血装置，包括留置针、血液计量器以及吸气泵，所述留置针通过输血管与血液计量器顶部连通，所述血液计量器表面设置有刻度，血液计量器底部设置有通孔，所述通孔处设置有透气防水膜，所述吸气泵通过气流管与通孔连通。该结构的换血抽血装置，能精确计量抽血量，大大降低了医疗风险。