When heroes are injured and have to heal themselves, the favored method is to quaff a Healing Potion. Typically this item is mostly used in Fantasy settings, but it can easily be adapted to other Speculative Fiction stories as a form of Applied Phlebotinum made of Nano Machines or whatnot. It can be as common as a Standard RPG Item, a one of a kind MacGuffin, or somewhere in between.
Healing [...] [tvtropes.org]