In the world of prosthetics, groundbreaking advances are transforming the lives of lower limb amputees.
Researchers at MIT, in collaboration with Brigham and Women’s Hospital, have developed a neuroprosthetic system that allows users to control a prosthetic leg using their own nervous system.
This innovative approach may bring us closer to a future of fully integrated, naturally controlled prosthetic limbs.
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People wearing neuroprosthetic systems (Hugh Herr and Song Hyun-woong)
AMI: A revolution in surgery
At the core of this breakthrough is a surgical procedure called an agonist-antagonist-nerve interface (AMI). Unlike traditional amputations, AMI reconnects the muscles of the remaining limb, preserving the natural push-pull mechanics of muscle pairs. This seemingly simple change has profound implications on the control and function of prosthetic limbs.
Diagram of how the neuroprosthetic system works (MIT Media Lab)
He is a professor at MIT, Lead study authorexplained its significance: “This is the first prosthetics study in history to demonstrate a fully neuromodulated prosthetic leg, resulting in biomimetic walking. No one has been able to demonstrate this level of brain control that produces natural walking, where the human nervous system controls the movement, rather than a robotic control algorithm.”
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Dr. Hugh Herr photographed with a neuroprosthetic system (Jimmy Day, MIT Media Lab)
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The Power of Proprioception
A key benefit of the AMI system is that it provides users with proprioceptive feedback – a sense of the position of their limbs in space. This sensory information is often taken for granted by people with healthy limbs, but is essential for natural movement and control. With AMI, patients can regain some of this important feedback, allowing them to walk more naturally and confidently.
The study compared seven patients who had AMI surgery with seven patients who had traditional amputation surgery. The results were surprising: AMI patients walked faster, navigated obstacles more easily, and climbed stairs with more agility. They also demonstrated more natural movement, such as pointing their toes up when stepping over obstacles — a subtle but important aspect of natural walking.
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People wearing neuroprosthetic systems (Hugh Herr and Song Hyun-woong)
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Adapting to real-world challenges
One of the most impressive aspects of the AMI system is its versatility. Patients were able to adapt their gait to different real-world situations, such as walking up a slope or climbing stairs. This adaptability is crucial for everyday life, where terrain and challenges change rapidly.
The responsiveness of the system was tested in an obstacle crossing trial. Patients with AMI were able to modify their gait to avoid obstacles more effectively than patients using traditional prosthetic limbs. This ability to rapidly adapt to unexpected challenges is a hallmark of natural limb function and represents a major advancement in prosthetic technology.
People wearing neuroprosthetic systems (Hugh Herr and Song Hyun-woong)
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The Science of Sensory Feedback
The success of the AMI system hinges on its ability to enhance residual muscle afferents, the sensory signals sent from muscles to the nervous system. Remarkably, even small increases in these signals can result in significant improvements in control and function. This finding highlights the incredible adaptability of the human nervous system and its ability to integrate and utilize even partial sensory information.
Dr Hyungwoon Song, lead author of the study, said: “One of the main findings here is that by slightly increasing neural feedback from the amputated limb, bionic neurocontrollability can be significantly restored, enabling direct neural control of walking speed, adaptation to different terrains, and obstacle avoidance.”
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People wearing neuroprosthetic systems (Hugh Herr and Song Hyun-woong)
Looking to the future
While this research is a major step forward, it’s only the beginning. The MIT team is exploring ways to further enhance sensory feedback and improve integration of the prosthesis with the human nervous system. The AMI procedure has already been performed on about 60 patients around the world, including amputees, suggesting it could be widely applicable to different types of limb loss.
As this technology continues to evolve, it may become possible to make artificial limbs more natural and intuitive to use, with the ultimate goal being to blur the line between human and machine, creating prosthetic limbs that feel and function like a natural part of the user’s body.
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People wearing neuroprosthetic systems (Hugh Herr and Song Hyun-woong)
Important points about the cart
The development of nervous system-controlled prosthetic limbs marks the beginning of a new era in bionics, offering hope for improved mobility, independence and quality of life for millions of people who have lost limbs, while also providing valuable insights into the plasticity of the human nervous system and its ability to integrate with advanced technologies.
Continuing to push the boundaries of what is possible at the intersection of biology and technology will open up new areas of human enhancement and rehabilitation, with implications that extend far beyond prosthetics and orthotics, into areas such as neurology, robotics, and even our understanding of human consciousness and embodiment.
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