The purpose of this feasibility study is to record cerebrospinal fluid (CSF) signatures from subjects who have an implanted drug infusion system and who undergo clinical tests designed to troubleshoot possible catheter-related problems as part of their normal standard of care. Signatures will be correlated with physician-determined catheter status.
The purpose of this study is to record signatures from the fluid surrounding the spinal cord from people who have an implanted drug infusion system.