#$%^&*AU2011205122B220131031.pdf#####Abstract An injector for injecting fluid from a syringe into an animal subject, the injector comprising: a powerhead comprising: an injector housing； a drive ram bidirectionally movable along a 5 longitudinal axis of the drive ram； a motor located within the injector housing and drivingly coupled to the drive ram to selectively advance and retract the drive ram along the longitudinal axis thereof； a plurality of buttons used to control operation of the powerhead, wherein the plurality of buttons is associated with a top side of the powerhead； a purge/retract trigger mounted on a pivot and associated with another side of the powerhead other than the 10 top side, the purge/retract trigger comprising: a first portion that can be depressed to move the drive ram forward along the longitudinal axis； and a second portion that can be depressed to move the drive ram in reverse along the longitudinal axis； and a power pack designed to supply power to the powerhead； and a remote console to allow for remote control of the powerhead. 15 C:Ipoftemp SPEC-921 77 doc
