Comparison of 1000 Hertz (Hz), Burst, and Standard Spinal Cord Stimulation in Chronic Pain Relief

Study will enroll 22 patients for the purpose of evaluation of efficacy of burst stimulation,
1000 hertz frequency stimulation or standard stimulation in patients who have a spinal cord
stimulators implanted. Each patients will be randomized to either group A or B, where each
groups consists of Burst, standard, and 1000 hertz frequency stimulation or vice versa with
wash off period in between. The duration for each stimulation modes will be approximately 3
weeks, with approximately 4 days of wash off prior to starting the new stimulation mode and
in between stimulation modes. Treatment duration for each groups will last about 3 months or
less, and with cross over total duration of the study is about 6 months in total.

During the trial there will be 13 visits. The first visit will consist of screening visit
activities and once the eligibility of the subjects are confirmed, they will be randomized
and they can start the study immediately and begin their wash off period. After the initial
visit/ randomization visit, there will be 12 follow up visits. At each visit, patients will
be assessed for their pain, disability index, and their perception of their painful
condition, as well as any adverse events and changes of medication usage or lack there of. At
the end of the study, the data will be pooled to look at the pain level, disability index,
and patients perceived changes in their painful condition for each treatment groups (Burst
stimulation, 1000 hertz stimulation and standard stimulation) to determine if subject
experienced equivocal pain relief from all three stimulation modes.

Inclusion Criteria:

- Subject must be 18 years and older, and younger than 75 years of age.

- Subject has had a Precision Spectra, or Plus spinal cord stimulator system implanted
for chronic painful condition.

- Subject continues to receive adequate pain relief with greater than or equal to 50%
pain relief based on pre-trial and pre-implant pain assessment.

- Device age should not be less than 2 months old.

- Subject is willing to comply with all requirements of the study.

Exclusion Criteria:

- Subjects who are getting <50% pain relief on current SCS based on pre-trial and
pre-implant pain assessment.

- Currently diagnosed with cognitive impairment, or exhibits any characteristic, that
would limit study candidate's ability to assess pain

- Unstable medical or psychiatric illness

- Urine drug screen shows controlled substance/s not prescribed by the prescribers.

- Lifetime history of psychosis, hypomania, or mania.

- Epilepsy, or dementia

- Substance abuse in the last 6 months

- Pregnant or breastfeeding

- Not on contraception for those of childbearing age. (Barrier methods, oral
contraception, hormone injections, or surgical sterilization)

- Treatment with investigational drug within 30 days of screening.