Electrode arrays and methods of making and using same

Described herein are improved electrode array devices and improved active agent delivery devices. Further described are methods of making and using the improved devices. An improved electrode array device includes a substrate and a plurality of probes disposed on the substrate, wherein the probes are formed from a plurality of aligned carbon nanotubes that are not encapsulated by a structure-providing material. An active agent delivery device includes a substrate having an aperture therein, an active agent delivery member disposed on a first surface of the substrate and having an aperture therein, and an active agent chamber disposed on a second surface of the substrate configured to deliver an active agent through the aperture of the substrate and the aperture of the active agent delivery member.