The first snake I ever tube-fed was many years ago...my vet gave me the syringe & catheter & a very short typed paragraph, no where NEAR this much info to go on.
So this is MY version...and feel free to ask your vet, share, copy, whatever....it's all about helping snakes recover.

I have tube-fed tiny 7" hatchling desert glossy snakes, a TX longnose snake, a corn snake, a rosy boa, a BP, just all kinds (even a rattlesnake but that's a WHOLE OTHER
chapter- much harder & different.) A snake that gets too weak from not eating (or other issues) will eventually have no appetite...after tube-feeding, & sometimes even
only once, they often* feel better & regain their appetite. *Obviously the success of any individual depends on the reason they aren't eating...if there's a stomach tumor,
for example, it's not going to alter their future, but for many common situations, this is SO worth trying.