Patent ID: 6892755

Claim:
An ambulatory infusion device for dispensing a fluid at a predetermined fluid flow rate, comprising: an elastic bladder having an interior volume for storing the fluid under pressure and an opening for dispensing the fluid; a pressure regulator in fluid communication with the opening of the bladder, the pressure regulator including an inlet for receiving fluid from the bladder at an inlet pressure, an outlet for discharging the fluid at a predetermined outlet pressure, a valve at the inlet having a hemispheric-shaped head adapted to cooperate with a frustoconic-shaped seat to promote uniform fluid flow therebetween, a movable diaphragm connected to the valve, and a valve plate opposite the diaphragm having channels or texturing therein for receiving fluid flowing through the valve, the diaphragm and the valve being movable in response to fluid pressure to maintain the outlet pressure within a predetermined range of pressures so that the fluid flow rate is substantially constant during fluid flow.