Patent ID: 6471686
Filing Date: 2002-10-29
Classification: A61M,Y10S

Abstract:
A drug delivery device comprising a holding reservoir, a pump, a delivery reservoir, and an outlet, said holding reservoir being connected to said delivery reservoir through said pump by a connection, said pump being operable manually whereby fluid is transferred from the holding reservoir to the delivery reservoir, said delivery reservoir being connected to the outlet through a flow restriction which controls flow to the outlet, said delivery reservoir being resiliently expandable from a minimum volume to a maximum volume, whereby a pressure that is induced on the fluid within the delivery reservoir between a first volume and a second volume provides a generally constant rate of fluid delivery, wherein the first volume is greater than the second volume, wherein the connection between the holding reservoir and the delivery reservoir permits flow only from the holding reservoir to the delivery reservoir when the pressure within the delivery reservoir is less than a predetermined pressure, wherein said connection has a control means for redirecting flow to the holding reservoir when the pressure within the delivery reservoir attains at least the predetermined pressure, and wherein a control valve is mounted between the delivery reservoir and the outlet, said control valve being adapted to open to allow fluid flow to the outlet when the pressure within the delivery reservoir exceeds a preset pressure, wherein the preset pressure is less than a maximum pressure.