It's an open wound so I would NOT use any type of antibiotic ointment. These oil based ointments that you get over the counter will slow the healing process and aggravate it. Your wife is a vet tech so have her bring you home some silver sulfadiazine cream. Make a shallow warm bath in a storage tub with lid and add enough betadine to make a light tea color. Let it soak in this for 10-15 minutes to kill bacteria and dry it out. Keep it on paper towels. Don't give it a water bowl large enough to soak in. Put 2 smaller bowls in the enclosure if humidity is an issue. If its being kept in a screen top enclosure, cover the top to keep in humidity.
The only thing safe for such an open wound is the silver cream. It will kill the bacteria and speed the healing process. That snake also needs a mouth culture and most likely antibiotic injections.
At this point, any vet who has worked with snakes minimally and has done cultures will do. Take it in and get this done so you can start getting it back to health.
Once you have the silver cream you won't need to do the betadine soaks. Put the silver cream on the wound a little daily or every other day as needed.
After a couple weeks of treatment I'd offer a small meal. Start feeding small and offer weekly to give the body a chance to adjust since its obviously starving.
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