I'm so sorry this has happened to you both. I'm sure you are in complete shock. It is such a blessing that he is already in the care of the vets and they are going to do everything they can. I'm sure he makes no connection to you and the dryer and what happened. He only knows that you rescued him, which you did!
I get so worried about this same thing happening because kitties are so curious. Accidents happen but it sounds like you've got a plan that will prevent it from happening again. We all should probably get doors on our laundry rooms if we don't already. (I need one).
Prayers going out right now and all night long that Andy will pull through and be home with you soon. I'm sure that is all he wants right now.