In 2020, Keith Thomas, then 45, dived into a pool in Massapequa, New York, and snapped his spine. The accident left him paralyzed from the chest down, unable to feel or move his arms and hands. What followed would become one of the most extraordinary medical stories of the century.
In March 2023, a team of surgeons, engineers and scientists at the Feinstein Institutes for Medical Research — part of Northwell Health, the largest healthcare provider in New York State — performed a 15-hour operation at North Shore University Hospital on Long Island, New York. During parts of the surgery, Thomas was conscious, telling surgeons exactly what sensations he felt in his hands as they mapped his brain in real time. Five microchips — each smaller than a fingertip — were placed in the areas of his brain responsible for movement and touch.
The result was a "Double Neural Bypass": an electronic bridge built from brain implants, artificial intelligence, and electrode patches placed on his spine and forearm. When Thomas thinks about moving his hand, the AI reads his brain signals, activates his muscles, and sends sensory feedback back to his brain — creating a two-way flow of information that his injured spinal cord can no longer provide.
Within months, Thomas felt his sister Michelle's hand for the first time since his accident — a moment he described as a rush of energy. He went on to lift a cup of water to his mouth, wipe his own face, and feel the fur of his family dog, Bow. His arm strength has more than doubled, and he continues to gain sensation even when the system is switched off — a sign the brain may be forming new pathways.
The technology, developed by Professor Chad Bouton and his team at the Feinstein Institutes, was inducted into TIME magazine's Best Inventions Hall of Fame in 2025, joining inventions such as the iPhone and YouTube. More than 100 million people worldwide live with some form of paralysis. For them, this is more than a breakthrough. It's a door opening.