Leg sensation restored
A research team reported that a brain implant connected to an exoskeleton let paralysis patients walk while also restoring leg sensation, not just movement. (theengineer.co.uk) The story highlights that the system provided sensory feedback during walking, which investigators say is a step beyond earlier exoskeleton trials that only produced movement. (theengineer.co.uk)
A brain implant linked to a robotic exoskeleton let people with paralysis move their legs and feel them during walking, researchers reported on April 17. (theengineer.co.uk) Walking normally depends on two signal loops: the brain sends movement commands down, and the body sends touch and position signals back up. A spinal cord injury can break both loops even when the leg muscles and lower spinal circuits still exist. (nature.com) The new system is a bidirectional brain-computer interface, meaning it both reads brain signals and sends electrical stimulation back into the sensory cortex, the brain area that helps register feeling from the body. The Engineer reported that patients used brain signals to control a robotic exoskeleton while the device restored leg sensation during stepping. (theengineer.co.uk) That adds a missing piece to earlier walking systems, which mostly focused on movement alone. In a 2023 Nature study, a separate brain-spine interface restored standing, walking and stair climbing by linking cortical signals to spinal cord stimulation, but the published report centered on motor control rather than sensory feedback. (nature.com) Researchers have been trying to restore touch and body awareness because movement without feedback is hard to fine-tune. Nature reported in November 2024 that brain implants, peripheral nerve interfaces and related neural devices were starting to return sensation to prosthetic or paralyzed limbs, expanding the field beyond simple command signals. (nature.com) The wider field is still small. A 2025 review in Nature Reviews Bioengineering found 28 clinical trials of implanted brain-computer interfaces across 21 research groups worldwide, with 67 total participants from 1998 through 2023, and said no implanted brain-computer interface had yet been approved for the medical device market. (nature.com) That makes walking with both control and sensation notable for rehabilitation research, where exoskeletons have often acted more like powered braces than connected body parts. The next test is whether sensory feedback improves balance, endurance, safety and day-to-day use outside tightly supervised lab sessions. (theengineer.co.uk)
