What are my options to help my husband who had a life threatening accident who's in the process of immigrating back to the US?

Speak to an experienced and qualified immigration attorney and do so fast. Some aspects of your case are unclear. If your husband was deported, regardless of the circumstances, he must in addition to an approved Form I-130 petition request and be granted a Form I-212 Request for Permission to Return to the US in addition, he must request and be granted a Form I-601 waiver to cure the grounds of his deportation. You did not provide the specific grounds of his deportation and you must know, not all grounds of deportation are eligible for a waiver. I am mindful of his current medical situation, and you may ask for the waiver and I-212 to be expedited. In the end, that decision is up to the consular officer and that is even assuming he qualifies. If his medical condition is sufficiently serious and if you can demonstrate the financial resources needed for private medical treatment, you may ask for an emergency B-1 nonimmigrant visa as an option. But doing this on your own without an attorney may prove unwise.