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Figure 2. Commercial finger images (top) and kinematic models of finger joint coupling mechanism (bottom). (a) Vincent (Vincent Systems), (b) iLimb and iLimb Pulse (Touch Bionics), (c) Bebionic v2 and Bebionic (RSL Steeper), and (d) Michelangelo (Otto Bock). ??1 = angle of metacarpal phalange joint, ??2 = angle of proximal interphalange joint.
This new artificial limb is powered by rocket fuel. A team of mechanical engineers has created an prosthetic leg that is powered by a special type of liquid fuel called a monopropellant — the same kind of fuel that gives rockets their thrust. The new device could usher in the next generation of prosthetics — powerful and light-weight artificial limbs that will look and function more like the real thing.