Prevent transfusion needle of blood backflow

The utility model discloses a prevent transfusion needle of blood backflow, including syringe needle and connecting seat, the syringe needle install in on the connecting seat, the infusion passageway has been seted up in the connecting seat, the infusion passageway is including big footpath section and path section, syringe needle, big footpath section and path section communicate in proper order, linking department of big footpath section and path section is equipped with and ends contrary diaphragm, path section internal stability is equipped with the mounting panel, end contrary diaphragm with be equipped with elastic element between the mounting panel, set up the through -hole that supplies the liquid medicine to flow through on the mounting panel, the utility model has the advantages of simple structure can prevent effectively that the blood backflow from getting into the infusion hose. 本实用新型公开了种防血液回流的输液针，包括针头和连接座，所述针头安装于所述连接座上，所述连接座内开设有输液通道，所述输液通道包括大径段和小径段，所述针头、大径段和小径段依次连通，所述大径段和小径段的衔接处设有止逆膜片，所述小径段内固设有安