Does anyone have experience with an inserted body pain pump?

After four back surgeries and a lower spine full of scar tissue, I have just about tried all the procedures available for relief, except an inserted body pain pump.

Back braces, tinge units, pt, pain killers and muscle relaxers have all been used without success. Surgery is not an option.

The only procedure left is a pain pump inserted into my spine.

Question: for those of you that had or have a pain pump inserted into your spine, what success have you received from it? Has the pain been lessened and to the point of returning to a half-normal life? I am just about to the desperation point with pain the scar tissue has on my spine and rightside muscles.

Any info is truly appreciated.