Patent ID: 7510552

Claim:
An implantable medication delivery device, comprising; an implantable housing having a medication reservoir compartment, a fill port connected to the medication reservoir compartment, a sealed electronics compartment configured to maintain a substantially constant internal pressure therein, and an outlet port operably connected to the medication reservoir compartment; at least one electronic device located within the sealed electronics compartment; and a normally opened passive valve located within the implantable housing and including a valve element, movable between an open position that allows medication flow and a closed position that prevents medication flow, and a pressure responsive structure, operably connected to the valve element, having a first surface exposed to the substantially constant internal pressure of the sealed electronics compartment and a second surface exposed to medication flow within the implantable housing; wherein the valve element and pressure responsive structure are respectively configured and positioned such that the valve element will move to the closed position when the pressure of the medication flow reaches a threshold pressure.