The purpose of this study is to determine whether the local anesthetic bupivacaine delivered intrathecally in small doses via PTM self-administered boluses significantly improves the breakthrough pain and functional status of patients with chronic intractable pain who are managed with an intrathecal drug delivery system.
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Change From Baseline in the Numerical Rating Pain Scale (NRS)
Timeframe: Before self-administered bolus using Patient Therapy Manager device (PTM) and within 30 minutes of PTM bolus