Cybernetics

Cybernetics were technological replacements for organic body parts, including eyes, limbs, and in extreme cases the majority of an individual's body, including whole new organ systems. Darth Vader was rebuilt with cybernetic parts by medical droids after having his limbs severed and nearly being burned to death. Luke Skywalker had a cybernetic hand installed to replace the lost appendage after his duel with Darth Vader.