How Can Thought-Controlled Prosthetic Limbs Become More Affordable?

For most high school students, keeping up with the demands of remote learning was enough of a challenge during the Covid-19 pandemic. Not for Benjamin Choi, then a sophomore at the Potomac School in McLean, Virginia. Choi decided to use all of the time at home to design – what else? – an affordable, non-invasive thought-controlled prosthetic arm.

Choi had long been fascinated by the idea of controlling prosthetics with one's mind, ever since watching a 60 Minutes report as an elementary school student. However, amazing as it was, that particular device required brain surgery to implant sensors into the patient's motor cortex. It also had a price tag of hundreds of thousands of dollars, putting it far out of reach for most people in need of a prosthetic limb.

Intrigued by the idea of creating an affordable alternative that didn't require brain surgery, Choi set up a lab/workshop on the ping pong table in his basement and went to work. He designed and built a prosthetic arm, created in pieces with his sister's 3-D printer. Rather than having to be implanted, Choi's device was controlled through head gestures and brain wave data from EEG sensors placed on the head and interpreted by an AI algorithm that Choi devised himself. This algorithm, which involves 23,000 lines of codes, performs with a mean accuracy of 95%. It learns from the user's brain patterns to become more accurate over time. It took 75 iterations, but Choi eventually produced a working device that could be manufactured for only $300 – a tiny fraction of the cost of even a basic prosthetic limb.

Learn more about Benjamin Choi's creation: