Self-destroying pre-filling type wash pipe injector

The invention discloses a self-destroying pre-filling type wash pipe injector which comprises a sleeve, a piston and a pull rod. The sleeve at least comprises a sleeve body, a blocking fin, an inner threaded pipe, an outer thread cap and a butt-joint intubation tube. The front end of the outer thread cap is provided with a sealing end cover which makes close contact with the butt-joint intubationtube so as to achieve sealing. The piston is connected to the inner wall of the sleeve in a sealed mode. The pull rod is arranged at the lower end of the piston. According to the self-destruction pre-filling type wash pipe injector, the internal thread pipe can be sealed through the outer thread cap and the sealing end cover, and when the self-destruction pre-filling type wash pipe injector is used, the outer thread cap is unscrewed, and then the butt-joint intubation tube is connected with infusion equipment; and the infusion equipment at least comprises a PICC and an infusion port. Accordingto the self-destroying pr