'Seus dedos não são medicamente necessários', respondeu o plano de saúde — então ele construiu a própria mão

Ian Davis is a mechanical engineer. In 2018, he has an accident in his workshop. He loses four fingers of one hand.

He asks his health plan for a new hand. The plan says no. The answer is hard: your fingers are not 'medically necessary'. The machine hand costs about 70,000 dollars.

So Ian builds his own hand. He uses metal rods, small chains and elastic bands. The hand has no motor and no battery. His wrist moves the fingers. The hand closes in 0.2 seconds.

He fixes it with cheap parts from a shop. He shows every step on the internet. Now he wants to build hands for other people too.