I know at one time if you had a 360 you could use a program named Modio that was a game save mod program that would allow you to have almost infinate health (when I say almost I mean you can take a crap-load of damage, probly 15 times more damage before you die). Its been a while since I played 360 so Im not sure if it still works. I dont know of any program that will allow that on PS3 unfortunatly.
The following user thanked Doctor Stan for this useful post:
by the sounds of it well have to wait untill someone finds a way of decoding the gamesave, then adding in the command we need and then re-encoding it either that or if someone works out a way of typing in that code (basically the same thing)