Reusable pre-flushing device

The utility model discloses a reusable pre-flushing device, which belongs to the technical field of medical instruments and comprises an injector, a three-way valve is sleeved at the output end of the injector, a quantifying component is sleeved on the outer wall of one end of the three-way valve close to the injector, and a discharge pipe is connected with one end of the three-way valve far away from the injector. The tail end of the discharging pipe is in butt joint with a liquid medicine filter, the end, away from the discharging pipe, of the liquid medicine filter is in butt joint with a first Luer check valve, and the end, away from the liquid medicine filter, of the first Luer check valve is in butt joint with an outer conical connector. By means of the quantitative assembly, the device can control the amount of discharged liquid medicine according to the condition of a patient, on one hand, medical staff can conveniently operate the injector to improve efficiency, on the other hand, waste caused by exc