doctor told him that when he was born he had dead ball?

Me and my soon to be husband have been trying to have a baby but his doctor told him that when he was born he had dead ball and im not too sure what this means but i know that he might not be able to have kids, and i have tried to talk to him about what if he cant but he dont want to hear it because he thinks that i am trying to fix him that he is broken but that is not true i love him and we are going to be married and i want to be able to have our own little family, i have thought about sperm banks but that is out of question because i want to have his kids not someone elses, i dont know what to do, is there meds that can help, and how do i get him to see that i am not trying to fix him, i dont think he is broken