A portable infusion device assembly, having two pouches in pressure transmitting relationship, the first containing infusate and the second, a driving medium. The driving medium is pressurized by activation of osmotic pump, electrochemical reaction, release of pressurized fluid or gas or mechanical means...http://www.google.com.au/patents/US5318540?utm_source=gb-gplus-sharePatent US5318540 - Controlled release infusion device
