Just wondering..when are morphine pumps recommended?

I am 28 and have severe leg pain and some back pain. I have 3 ruptured discs and one bulging, spinal stenosis, facet syndrome and failed back syndrome (2 prior surgeries). I am currently on methadone and morphine (for breakthru pain) but that regimen is not cutting it. I had an SCS trial this week and had it taken out today. The surgeon thinks I am a good candidate for this but I am very anxious about the whole thing and worried that it may not be worth it.

I want to consider all my options and am therefore doing research on a morphine pump too. When are these indicated??

Also, my husband and I want to have children in the next year or two and that is a consideration.

Thanks in advance!