In a cosed-loop process, a controller uses a flow sensor to monitor the flow of a medicinal fluid being infused into a patient, to achieve a desired rate of flow. A relatively inexpensive peristaltic pump or electronically controlled valve can be used to vary the flow of the medicinal fluid through a...http://www.google.com/patents/US6981960?utm_source=gb-gplus-sharePatent US6981960 - Closed-loop IV fluid flow control
