Taking children to their surgeries?

Does anyone know of any foundations or organizations that I could get into contact about this? Is there any organization where people from poorer countries can send their children to the U.S. for medical procedures that their country may not be able to perform (such as cleft palates), and so someone from the U.S. can "adopt" them for that short period of time and take them to all of their appointments and surgeries and then when they are all better, send them back to their families?