MIT researchers are using FUTEK’s sensors to make robotic leg
Developed by Matthew Carney of MIT Media Lab’s Biomechatronics group, the revolutionary TF8 actuator is a powered prosthesis. Rather than employing a one-size-fits-all design, it is able to replicate the kinetic and kinematic functionality of the human ankle—moving and responding to force in a lifelike way. The robotic ankle is driven by an MIT-developed reaction-force, series elastic actuator (FRSEA). In conjunction with FUTEK’s LCM300 load cell, the actuator allows for the wearer’s weight and gait to handle varied terrains such as stairs and inclines. The prosthetic ankle is neurally controlled thanks to a new MIT-developed amputation technique. This relocates the muscles and some nerves to above the amputation zone, instead of removing them. Sensors in the prosthetic read the signals from these muscles and can transmit sensations to the nerves.
These preserved muscles and nerves, which once controlled the leg, now allow neuromuscular bi-directional communication between the prosthesis and its wearer. As a result, the wearer experiences an artificial lower leg that feels real, as they can sense the ankle’s movements. Robotic prostheses integrate cutting-edge biomechanics, mechanical, electrical and software engineering.
The prosthetic ankle relies on FUTEK’s LCM300 strain gauge load cell for its force measurement. It was chosen due to its small footprint, lightweight, high accuracy and easy installation. A load cell is a transducer that converts force into measurable electrical output. Precision CNC machining allows FUTEK to consistently produce sensors with the very tight tolerances required for robotic and biomechanical applications. Its sensors can measure force, pressure and torque directly, plus they can also indirectly measure aspects like flow, viscosity and occlusion.
The medical and medtech market is an expanding field for FUTEK, accounting for around 30 percent of its business and growing each year. Beyond powered prostheses, FUTEK’s sensors are also found in exoskeletons and robotic arms including surgery robots. Other important sectors include aerospace and defense, manufacturing and automotive.
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