Patent ID: 8056556
Filing Date: 2011-11-15
Classification: A61M

Abstract:
1. A medication delivery apparatus, comprising: a first pressurized supply of fluid in a reservoir; a fluid conduit from the supply to an ejector head including at least one selectively disabled resistor; a valve operatively positioned in the fluid conduit between the supply and the ejector head; a programmable controller; wherein the reservoir, the fluid conduit, and the ejector head form a fluidically connected fluid delivery unit controlled by the programmable controller; a first operational mode controlled by the controller, wherein, in the first operational mode of the fluid delivery unit, the ejector head is operable to deliver fluid from the reservoir through the ejector head, the fluid in the ejector head and the fluid conduit being at a lower pressure relative to the fluid in the reservoir; and a second maintenance mode controlled by the controller, wherein, in the second maintenance mode of the fluid delivery unit, the at least one resistor of the ejector head is disabled and the valve is opened to create positive pressure throughout the reservoir, the fluid conduit and the ejector head; the positive pressure purging out all remaining fluid from the fluid delivery unit by way of the disabled ejector head, and the positive pressure for the second maintenance mode being generated by opening the valve and disabling the at least one selectively disabled resistor.