Review of Recent Advances in Implantable Brain-Computer Interfaces for the Restoration of Motor Function in Patients...

Implantable brain-computer interfaces (BCIs) - positioned at the intersection of neuromedicine and clinical neurorehabilitation - have achieved notable advances in restoring motor function for individuals with paralysis. By using invasive electrodes to directly sample cortical neuronal activity and translating these signals into control commands for external effectors, BCIs offer a viable therapeutic pathway for severe motor impairment. On the mechanistic front, steady improvements in neural signal acquisition and decoding have enabled more precise capture of movement intent and real-time control of robotic manipulators, exoskeletons, and functional electrical stimulation systems, thereby supporting partial restoration of motor function. Evidence from animal studies and early clinical investigations indicates that long-term implanted electrodes provide distinctive advantages in signal stability, spatial resolution, and the induction of neuroplasticity, which collectively strengthen basic mechanistic inquiry and translational application. At the application level, recent work combining high-density electrode arrays with deep learning-based decoding strategies has demonstrated near real-time, multi-degree-of-freedom control of hand and upper-limb movements. In parallel, hybrid interfaces integrating electroencephalography and electromyography, together with closed-loop neuromodulatory paradigms, further extend the rehabilitative potential of BCI systems. In summary, implantable BCIs show substantial promise for motor recovery in paralysis and are progressing from laboratory demonstrations toward bedside deployment. With continued convergence of materials science, artificial intelligence, and clinical neuroscience, BCIs are poised to play an increasingly pivotal role in improving quality of life and advancing the practice of neurorehabilitation. This article aims to review recent advances in implantable BCIs for the restoration of motor function in patients with paralysis.