If your pain is severe I'd expect to hear that you''re on morphine, hydromorphone, methadone, or fentanyl patch
If your pain is managed with hydrocodone, then the pump may be premature.
However, if you've been on all the stronger opioids and are indeed severely opioid tolerant, then consider it. If your pain doctor recommends the pump and their is no contraindication, go for it.
Do you understand how the pump works?