Exoskeleton suits promise to lift the impossible, but those promises typically come with a six-figure price tag. Kinethreads addresses that hole with a novel approach: a full-body garment without the bulk or cost. Built with off-the-shelf materials and imaginative fabric engineering, this system costs less than $500, making muscle imitating technology affordable.
Kinethreads wraps around the chest, arms, and legs like a second skin, providing guiding via simple strings and motors. The Responsive Environments group choreographed the entire thing using nylon threads, micro servo motors, and a Raspberry Pi brain. Each limb segment contains a number of these threads, which are routed via fabric channels, joined at joints, and pulled taut by motors. When triggered, a thread contracts like a synthetic tendon, drawing the cloth in and compressing the underlying muscle.
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Early prototypes concentrated on the arms, where support was most needed. A sleeve fits around the bicep and forearm, with threads going from shoulder to wrist. Four motors control each arm: one for shoulder flexion, one for elbow bend and two for rotation and extension. Fabric choice is key here; elastic neoprene for the base layer for comfort and rigid plastic guides to keep the threads from wandering. You program the Raspberry Pi with simple Python scripts and adjust the tension with sliders on a laptop connected to it.
Legs require more from the design, so Kinethreads adapts with wider bands around the thighs and calves, spreading the force over a larger area as well as reducing hotspots. Threads here double as hip abduction and knee stabilization which is essential for anyone learning to walk again after an accident. The motors are mounted on a belt pack so the suit can be untethered and moved around. It’s powered by a regular lithium-polymer battery and can last for 2 hours of active use before needing a quick recharge.
Vibration motors along the threads buzz slightly as you contract, telling you when assistance is available. This mix of pressure and shake allows your brain to map the suit’s movements, turning passive support into active learning. Over time, reliance on these cues decrease as natural control returns.
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