Dual chamber and gear pump assembly for a high pressure delivery system

A high pressure delivery system for delivering a medicament, comprising:

• a first chamber for storing a supply of the medicament;
• a gear pump assembly in fluid communication with the first chamber, said gear pump assembly having a dose inlet and a dose discharge, said dose inlet having a larger diameter than said dose discharge to provide a high pressure discharge;
• and
• a fluid connection path in fluid communication with the gear pump assembly for delivering the medicament to a high pressure area;
• wherein
• pockets formed between adjacent teeth of a first gear and adjacent teeth of a second gear of the gear pump assembly each have a volume at a cross section defined when respective teeth of the first gear and the second gear are fully engaged;
• and
• the pockets gradually increase in volume in the defined cross section such that a gradually increasing rate of medicament is delivered during the dose.