A formulation chamber is disclosed comprising a wall surrounding a lumen containing a device for delivering a beneficial agent. The chamber has an inlet for admitting a fluid into the chamber and an outlet for letting an agent formulation leave the chamber. The chamber is adapted for use in an intravenous...http://www.google.ca/patents/US4994031?utm_source=gb-gplus-sharePatent US4994031 - Intravenous system for delivering a beneficial agent
