Patient-controlled analgesia in chronic pain patients: experience with a new device designed to be used with implanted programmable pumps.

Background: Intrathecal drug delivery using implantable pumps is an effective method to control stable chronic pain. However, the appropriate alleviation of unpredictable pain fluctuations remains challenging. A possible solution is the use of patient-controlled analgesia (PCA) by means of a specific device--the personal therapy manager (PTM)--designed to be used with implanted programmable pumps.