RecruitingDevice studyProspective Evaluation of Effectiveness and Safety of Closed-Loop Spinal Cord Stimulation in Treating Patients With Chronic Pelvic PainSpinal cord stimulation (SCS) is an effective treatment for patients with chronic pelvic pain. The investigators will evaluate how safe and effective closed-loop spinal cord stimulation is in treating these patients; closed-loop spinal cord stimulation is a more novel method in delivering spinal cord stimulation that controls energy output of the device based on real-time feedback on how the device is stimulating the spinal cord.