Disclosed are devices, electrodes, systems, methods, and other implementations, including a device that includes an electrode comprising an elongated body, a plurality of electrode contacts disposed on a first side of the elongated body, and a cannulation channel defined along a longitudinal axis of the electrode. The device further includes a guiding mechanism received within the cannulation channel, the guiding mechanism configured to guide the electrode for placement at a target area inside a body of a patient. In some embodiments, the cannulation channel is configured to receive irrigation fluids dispensed through a perforated end located near a leading tip of the elongated body.