Patent ID: 6348043
Filing Date: 2002-02-19
Classification: A61M

Abstract:
An infusion pump comprising:a pump housing having an internal chamber and a port for dispensing liquid from said chamber; a piston slidably engaging said internal chamber of said pump housing; drive means for moving said piston forward toward said port to dispense a series of doses of liquid; a flow restrictor restricting the flow of liquid from said chamber through said port, thereby maintaining pressure within said chamber as liquid is dispensed from said chamber; and a member extending across at least a portion of said piston, wherein said member moves rearward from an initial position under pressure as said piston moves forward and liquid is dispensed from said chamber, and then gradually returns to said initial position after forward motion of said piston stops and pressure within said chamber decreases, thereby continuing to dispense a small quantity of liquid from said chamber for a period of time after forward motion of said piston stops.