Infusion Pumps are used to deliver very small
quantities of drugs over long periods of time. They are also commonly called Syringe
Pumps. A worm gear (shaft) slowly turns, moving the plunger of the syringe
in, and pushing the medication out. These can also be used in reverse to withdraw
fluids.
Here the action is shown much faster than it usually would be. The
injection might take place over a period of many hours.
A typical infusion
pump might have a flow rate range from .2 cubic centimeters (cc) to 500cc per
hour. At .2cc per hour, a 10cc syringe would require 50 hours to empty.
(This is a still
representation and possibly also a low-resolution image of a pump which is fully
animated in the CD-ROM version of this glossary.) 
