Magnetic Sensors Improve Prosthetic Limb Control
Researchers at the Massachusetts Institute of Technology (MIT) have made a breakthrough in developing more accurate control systems for prosthetic limbs. By implanting tiny magnetic beads in muscles, they can track muscle movement with greater precision, enabling individuals with certain types of amputations to control their prosthetic limbs more effectively.
The new system, known as magnetomicrometry, uses pairs of magnets implanted in muscles to measure the change in distance between them, allowing for the calculation of muscle length and velocity. This approach offers a more accurate and reliable method of tracking muscle activity compared to traditional electromyography, which relies on electrodes placed on the skin.
In a study published in Nature Sensors, the researchers demonstrated the accuracy of the magnetic measurements in three participants with below-knee amputations. The participants had magnets implanted in up to four muscles of the ankle joint, and the researchers compared the accuracy of three different types of measurements: magnetomicrometry, electromyography with implanted electrodes, and electromyography with electrodes on the surface of the skin.
The results showed that the magnet-based approach offered more accurate and stable control, suggesting that it could be a more effective method for controlling prosthetic limbs. The researchers are now conducting a larger study to evaluate the performance of the system in a more practical setting.
The development of this technology has the potential to improve the lives of individuals with amputations, enabling them to control their prosthetic limbs with greater precision and ease.
