A system and method for detecting and predicting neurological events with an implantable device uses a relatively low-power central processing unit in connection with signal processing circuitry to identify features and calculate window-based characteristics in an electrographic signal received from a patient’s brain. The local pumping stations may include at least one pump, and a local controller in communication with the central controller configured to monitor each device of the local pumping station. The metering assembly is disposed proximate the second external seal. The springs and sliders individually bias the movable contact arms and movable electrical contacts toward engagement with corresponding stationary electrical contacts.