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Justin SanchezHead of the program to create a robotic limb with sensation
Country:
 USA |
Content:
- The Arm That Feels: Restoring Tactile Sensation
- The Hand That Restored Sensation
- Bridging the Gap: Translating Force to Sensation
- The Masterminds Behind the Marvel
- A New Dimension of Experience
- Revolutionary Prostheses: The Future of Limb Restoration
- Sensory Innovation: Beyond Movement to Perception
- A Life-Changing Moment: Nathan's Experience
- Precision and Recognition
- Sensory Restoration in Lower Limbs
- A Simple Yet Effective Solution
The Arm That Feels: Restoring Tactile Sensation
In the cinematic realm of "Star Wars," Luke Skywalker's bionic hand grants him the ability to sense touch. Now, a real-life robotic limb has brought this fantasy to reality for a patient, thanks to a microchip implanted in their brain.
The Hand That Restored Sensation
American researchers have created an upper limb prosthesis that not only restores movement and dexterity but also provides a sense of touch. A 28-year-old paralyzed man named Nathan is the first recipient of the device. For the first time in years, he could feel someone caressing his "hand."
Bridging the Gap: Translating Force to Sensation
Similar to the powerful sensors in Luke Skywalker's hand, the robotic limb features force sensors that provide feedback. This feedback is converted into electrical signals that are sent to Nathan's brain. Electromyography (EMG) electrodes detect electrical signals from his brain, allowing him to control not only the limb's movements but also to perceive what its mechanical fingers touch.
The Masterminds Behind the Marvel
Scientists from the University of Miami and DARPA (Defense Advanced Research Projects Agency) collaborated on this groundbreaking technology. Dr. Justin Sanchez, lead researcher, unveiled the "sensory prosthetic hand" at the Wait What? tech conference.
A New Dimension of Experience
"Nathan is able to experience and feel what the robotic hand is touching, simply by using his thoughts," explained Sanchez. "This has required cutting-edge technology that translates forces applied to the robotic hand's fingers into electrical pulses that can be used to directly stimulate sensory neurons in the brain."
Revolutionary Prostheses: The Future of Limb Restoration
DARPA's Neural Engineering System Design program aims to empower amputees and paralyzed individuals. Electrodes are implanted into volunteers' brains, capturing minute electrical impulses from neurons. This allows near thought-controlled operation of robotic limbs, enabling them to perform tasks like shaking hands or playfully fist bumping.
Sensory Innovation: Beyond Movement to Perception
To advance the technology further, Dr. Sanchez utilized electrodes to tap into tiny electrical signals in the brain's sensory regions, mimicking the sense of touch.
A Life-Changing Moment: Nathan's Experience
Nathan, who became paralyzed after a spinal cord injury, was the first to receive this enhanced technology. "Motor-controlled prostheses offer great promise, but without sensory feedback to the brain, achieving fine control can be challenging," said Sanchez. "By sending sensations from touch directly to the brain, this approach has the potential for seamless, near-natural bionic restoration of human function."
Precision and Recognition
Tests with Nathan revealed his ability to identify which of his robotic fingers researchers were touching, even while blindfolded. "At one point, our team applied pressure to two of Nathan's fingers instead of one, without telling him," recalled Sanchez. "He jokingly asked if someone was messing with him."
"That's when we knew that the sensations Nathan was experiencing through the robotic hand were approaching true-to-life."
Sensory Restoration in Lower Limbs
Researchers have also succeeded in restoring the sense of touch in prosthetics for lower limbs. By "rewiring" remaining nerve endings from the amputated limb to healthy tissue in the upper leg, closer to the skin's surface, scientists can create a sensation of touch.
A Simple Yet Effective Solution
This breakthrough is made possible by a technique developed by Professor Hubert Egger of the University of Applied Sciences in Austria. Six sensors are placed on the sole of the prosthetic foot. These are connected to so-called stimulators located inside the socket that attaches the prosthesis to the residual limb. In the healthy leg, cutaneous receptors fulfill the stimulators' function.
"The sensors tell the brain where the foot is at any given moment, giving the prosthesis wearer the feeling as if they are moving their own foot when they take a step," explained Egger. "Considering the outcome, the procedure is remarkably straightforward."
