Floating Microelectrode Array

Floating Microelectrode Arrays (FMAs)*, specifically designed for long-term chronic applications. They improve upon the benefits offered by a standard chronic array while also accommodating numerous, user-defined specifications. These arrays are exceptionally customizable and well-constructed.

FMAs simultaneously empowers recording from different cortical layers, sub-cortical regions and depths as a result of combining uniquely long electrode lengths of up to 10mm with the ability to offer multiple lengths within a single array.

FMAs are made with a laser-drilled ceramic substrate to accommodate the number of platinum/iridium or pure iridium electrodes desired up to 32 channels. The array is then tethered using a bundle of 25µm gold wires (~1/3 the diameter of human hair) that have been coated with a silicone elastomer. This assembly allows the rigid connection point to be situated away from the array itself, which permits the array to float with all of the movements of the brain.

The FMA is implanted using a reusable vacuum insertion tool that is designed specifically to hold the back of the substrate. This tool will work with the majority of available micromanipulators and enables the user to perform a very gradual insertion process that minimizes dimpling. After the desired depth has been reached, the dura can be secured over the electrode substrate with sutures.

To enhance your experience and results when using FMAs, we offer a breadth of compatible, high quality connectors, headstages, headstage cables, and commutators. You may also wish to explore other options in Plexon’s family of specialty electrodes, probes and arrays including our Microwire Array, U-Probe, or the advanced Thumbtack Probe

Research labs around the world performing stimulation and recording studies in larger animals, like primates, have trusted custom FMAs for years. Your Plexon Sales Engineer is available to provide additional information and help you determine what might be the most advantageous FMA configuration to optimize your research.