I remember reading a case where a boy who was supposed to die at a certain age, and his parents brought him to a priest who recommended them to go see Buddha. The Buddha also prophesized the same thing, and he called all the monks to chant suttas for the boy. On the final day, the Buddha himself came in to chant for the boy and he lived up to age 120. But i guess this is not exactly the healing you meant, for if I am not mistaken, the cause of the boy's death is because a demoness is chasing to kill him.
And yes, the Bojjhanga Sutta- The sutta of factors of enlightenment was originated when the Buddha chanted that sutta for his disciples (and later his disciples did that to Him as well) and they were all cured from their respective sickness.