In the comics, Tony infects himself with a fixed Extremis virus. In the comics, that is what This allowed Tony to connect to Jarvis/hishis network without a headset... he gave himself better reflexes and some of the iron man suit components in his body. The fact that they showed Tony talk to Jarvis without aan earpiece tells me that he modified the Extremis virus and infected himself...., which would allowallowed him to heal from that kind of surgery.