In regards to wound treatment/management, why dont you have a glance over to Dwarf Fortress? It has a quite brilliant "damage" system, and while I encourage having a health bar, injuries from minor scratches to flesh wounds or broken bones could be interesting. I always wondered why those bear attacks make no more severe problems than waiting some time to regain consciuosnes.
Oh yea, by the way flesh wounds: lots of tribes used ants to treat open wounds; the saliva stopped the bleeding, and the ant claws (?) were used to close the wound. Simply let the ant bite and rip off its body - voila, you tacked the wound. The ants are already ingame ^^