Presently disclosed is a hydraulic pump device and its use thereof, especially in a fluid delivery system. In one embodiment, the fluid delivery system is an inexpensive, single-use device for slow dosing medicament applications. The fluid delivery system may employ a spring-compressed bellows crank...http://www.google.com.au/patents/US8070726?utm_source=gb-gplus-sharePatent US8070726 - Hydraulically actuated pump for long duration medicament administration
