Trialing of ISS in Patients With CRPS

1. Capable of giving written informed consent to participate in this clinical study.
2. Must be 18 years old or older.
3. Predominant pain in one or both of the lower limbs attributed to CRPS or causalgia that has been refractory to conservative therapy for at least 3 months.
4. Average pain intensity larger or equal to 6 on the numeric pain rating scale (NPRS).
5. Appropriate candidate for spinal cord stimulation as determined by the Investigator.
6. Subjects must be on a stable dose of pain medication regimen for at least 1 month.
7. Must be able to comply with the requirements of study visits.
8. Have cognitive ability of operate the remote control and follow therapy instructions and directions by clinicians.

Exclusion Criteria:

1. Systemic infection.
2. Any other active implanted device.
3. Evidence of serious neurological, psychological or psychiatric disorders.
4. Previous posterior decompressive laminectomy that precludes appropriate posterior epidural placement of stimulation lead(s).
5. Patient who are pregnant, breast-feeding or women of childbearing potential with positive pregnancy tests.
6. Human immunodeficiency virus (HIV) infection or a clinically significant infection.
7. A clinically significant disorder such as cerebrovascular disease, pulmonary infarction, ischemic heart disease, cardiac dysrhythmia, myocardial infarction, or congestive heart failure or any other as determined by the investigator.
8. Uncontrolled diabetes, uncontrolled pulmonary disease, or uncontrolled hypertension.
9. Patients who have evidence of major psychiatric disease, mental disorder, drug dependency, alcohol dependency, or substance abuse disorders.
10. Patients who have progressive neurological disease such as multiple sclerosis, chronic inflammatory demyelinating polyneuropathy, rapidly progressive arachnoiditis, acute herniated disc, or any other as determined by investigator.
11. Medical condition or pain in other body areas determined by the Investigator as interfering with study procedures, accurate pain reporting, and/or confound evaluation of study end points.
12. Concurrent participation in another clinical study.
13. Involvement in an injury or disability claim under current litigation or a pending or approved workers' compensation claim.
14. Escalating or changing pain condition over the last 30 days that creates difficulty of pain evaluation by the patient.