Oh my gosh poor thing!
Don't give up. Keep him clean, I don't really have any advice other than keep him as comfortable as possible and away from any corners or stuff he could rub up against and tear it open even more. Although it's a good sign that there's no weird smells or visible rot. I'm sorry you and your snake are going through this, and I hope the vet can suture it and give him some antibiotics maybe. Hopefully it's not the end![]()