Patent ID: 6942636
Filing Date: 2005-09-13
Classification: A61M,G05D

Abstract:
1. A system for maintaining a desired delivery rate of a fluid flow through an intravenous line, comprising: (a) a pump chassis; (b) a pump in fluid communication with the intravenous line and mountable within the pump chassis to receive a driving force from a driven member, said pump including an inlet port, an outlet port, an elastomeric membrane overlying a chamber comprising a portion of a fluid path extending between the inlet port and outlet port, said driven member exerting a force on the elastomeric membrane that displaces the fluid from the chamber and into the intravenous line; (c) an inlet pressure sensor that produces an inlet pressure signal indicative of an inlet pressure upstream of the chamber; (d) an outlet pressure sensor that produces an outlet pressure signal indicative of an outlet pressure downstream of the chamber; and (e) a controller that is electrically coupled to the inlet pressure sensor and the outlet pressure sensor to receive the inlet and the outlet pressure signals, said controller employing the inlet pressure signal and the outlet pressure signal to determine a first correction factor to be applied to an initial position of the driven member, said first correction factor being expressed as a change in a position of the driven member relative to the chamber.