Injection syringe

The invention relates to an injection syringe. The injection syringe comprises an injection tube, a needle group and a push rod. The injection tube comprises a collection section located at one end of the injection tube enclosing an accommodation chamber. The needle group comprises a connector, a needle base and a needle head. The connector is arranged in the collection section in a separable manner. The needle base is connected with the connector in a group. The needle head is arranged at one end, away from the connector, of the needle base. The outer wall of the connector is provided with a code in a concave-convex structure stamped by a die for shaping the connector. The push rod comprises an elastic piston and an ejection part. The elastic piston rod can be arranged in the injection tube in a sliable manner. One end of the ejection part is arranged in a manner of penetrating through the elastic piston. 本发明关于种注射器，其包括注射筒、针具组及推杆。该注射筒包括位于该注射筒端的收束段，该注射筒围构容室。该针具组包括转接头、针基及针头，该转接头可脱离地设于该收束段中，该针基组接于该转接头，该针头设于该针基远离