Abstract: An apparatus for delivering fluid, or power syringe, comprises a base, a lever, and a syringe. The syringe has a reservoir adapted for holding a quantity of fluid and a plunger disposed within the reservoir and adapted for movement therein. The reservoir features a clip on one end which releasably secures the end of the reservoir to the base and an inwardly facing annular flange on the second end which substantially prevents the plunger from being removed from the reservoir and substantially prevents leakage. The base of the apparatus features an extension beyond the end of the reservoir containing the clip, thereby providing stability to the apparatus during operation. The plunger features a clip on one end which releasably secures the plunger to the lever.

Abstract: A power syringe (10) for use in medical procedures, such as angiography, delivers air or fluid, such as contrast medium, to a patient at operator controlled rates and pressures. In one embodiment, mechanical advantage is created by first and second arms (22, 26) which are interconnected with each other, the base, and the plunger (20). The proximal end of the syringe contains a track (44) that the plunger follows in normal fashion in and out of the reservoir. The track is bevelled from proximal to distal end to create a path with variable resistance. A mechanical stop (42) is at the proximal end of the track to control the length of travel of plunger and secondary mechanical arm. Markings (18) on reservoir (12) indicate the volume of fluid or air in the reservoir. Mechanical arm length, tracking length, and distance to plunger stop will vary with size of syringe to generate appropriate flow and power.