Safety syringe comprising a piston rod and a piston provided with mutually engaging protrusions which automatically disengage when the piston rod is retracted through a required distance

摘要

A safety syringe comprising a piston rod (41) and a piston (42) provided with mutually engaging protrusions (412a, 412b, 412c, 412d) and (422a, 422b, 422c, 422d) which automatically disengage when the piston rod is retracted in the piston cylinder through a required distance, is new.