Hi Valleygirl
I was thinking, if he paralized, then he probably sitting most of the time, which can cause luck of blood circulation in that area; so what if you provide him with a good memory foam doughnat pillow. Any warming device will need close monitoring so it won't cause a burn. I also thought about substituting his enema with glycerin suppository( I've seen them in kids size and even considered buying for myself ), it may have the same effect plus lubrication. Is his fissure internal or external?
I'm not autorized ofcourse to give any medical advise, especially in such unfamiliar situation, I just share my thoughts.