The invention provides a syringe for use in an ophthalmic injection. The syringe comprises a body, a stopper and a plunger. The body comprises an outlet at an outlet end and the stopper is arranged within the body such that a front surface of the stopper and the body define a variable volume chamber from which a fluid can be expelled though the outlet. The plunger comprises a plunger contact surface at a first end and a rod extends between the plunger contact surface and a rear portion. The plunger contact surface is arranged to contact the stopper but not couple thereto, such that the plunger can be used to force the stopper towards the outlet end of the body, reducing the volume of the variable volume chamber, but not to move the stopper away from the outlet end.本發明揭示一種用於眼部注射之注射器。該注射器包括一主體、一塞子及一柱塞。該主體包括一出口端處之一出口且該塞子配置於該主體內,使得該塞子之一前表面及該主體界定一可變容積腔,一流體可透過該出口而自該可變容積腔排出。該柱塞包括一第一端處之一柱塞接觸表面且一桿延伸於該柱塞接觸表面與一後部部分之間。該柱塞接觸表面經配置以接觸該塞子但非耦合至該塞子,使得該柱塞可用於迫使該塞子朝向該主體之該出口端以減小該可變容積腔之容積,但無法用於使該塞子移動遠離該出口端。4‧‧‧柱塞22‧‧‧柱塞接觸表面24‧‧‧第一端25‧‧‧後部部分26‧‧‧桿32‧‧‧桿凸肩42‧‧‧凸緣44‧‧‧肋條46‧‧‧圓盤形部分48‧‧‧間隙50‧‧‧間隙
