Patent ID: 8425493
Filing Date: 2013-04-23
Classification: A61M

Abstract:
1. An integrated medication delivery device configured to be implanted into a patient's body, said device comprising: a mounting structure; a movable wall carried by said mounting structure and defining a variable volume reservoir; a fill port for supplying medication to said reservoir; said mounting structure defining a fluid inlet port communicating with said reservoir, a fluid outlet port for discharging medication into said body, and a fluid path operable to transfer medication from said inlet port to said outlet port; said fluid path including a pump chamber, an inlet check valve that is biased to the closed state, that opens when pressure in the pump chamber is lower than reservoir pressure and located between said inlet port and said pump chamber, an outlet check valve that is biased to the closed state, that opens when pressure in the pump chamber is greater than reservoir pressure and located between said pump chamber and said outlet port, and a safety valve that is located between said outlet valve and said outlet port and is exposed to reservoir pressure by way of a channel that is not part of the fluid path; a pump actuator associated with said pump chamber operable to define a suction mode for pulling fluid via said inlet port from said reservoir into said pump chamber and a pressure mode that causes fluid from said pump chamber to be forced through the outlet check valve to said safety valve; and wherein said safety valve permits fluid flow when the pressure in said pump chamber exceeds the pressure in said reservoir and prevents fluid flow when the pressure in said reservoir exceeds the pressure in said pump chamber to prevent unintended medication discharge through said outlet port.