Patent ID: 6432089
Filing Date: 2002-08-13
Classification: A61M

Abstract:
A syringe comprising:a cylindrical syringe body (3); and a plunger (4) movably disposed within the syringe body (3) for injecting a liquid agent filled in the syringe body (3) from the syringe body (3) into the vascular system of a human body or animal, the plunger (4) comprising a plunger body (5) and an elastic cover (9) fitted over the plunger body from the front, the plunger body (5) comprising a backplate (62) at a rear end thereof, the backplate (62) defining an annular groove (68) forwardly opened and formed in a front surface thereof in the vicinity of an outer periphery thereof, the elastic cover (9) comprising a portion to be rearwardly stretched by friction with the syringe body (3) during advancement of the plunger (4) and operable to ingress into the annular groove (68).