is he eating at all? I hate to sound negative, but I think he is far from out of the woods. Fingers crossed he can recover from this and good for you for giving him a chance!
Oh I agree the animal is not out of danger as well. I just think it's amazing when something like this works. Or even appears to work. One step closer. Maybe at least the animal is more comfortable (assuming I'm not anthropomorphizing here.
I know a fellow that removed a lima bean sized rock from an Axolotls stomach when no vet would try it. Animal is fine now.
Sometimes doing something a little crazy is better than doing nothing at all.