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The physical interface between the machine and the body has seen a revolution with Thin-Film Electrode Arrays. In 2026, these arrays are constructed from highly flexible, biocompatible polymers that are significantly thinner than previous platinum-iridium wires.

This flexibility allows for "Atraumatic Insertion," meaning the delicate structures and residual hair cells inside the cochlea are preserved during surgery. Furthermore, these arrays feature a higher density of electrodes (up to 32 or 64 channels), allowing for a more precise "tonotopic" mapping of the inner ear, which translates to a more natural and less "robotic" sound experience.