Wireless High Frequency Spinal Cord Stimulation for Chronic Pain

This is a multi-center, prospective, randomized study in which subjects will receive a
Freedom SCS System and be randomized 1:1 to receive either HF (10,000 Hz) or LF (5 Hz to 1500
Hz) stimulation parameters. Enrollment will continue until 80 responders at end of trial have
been identified. A description of the Freedom SCS System can be found in Appendix A.

Subjects will have chronic back or back and leg pain refractory to standard medical treatment
associated with Failed Back Surgery Syndrome (FBSS). Subjects will be randomized into either
the test (high frequency) or control (low frequency) group for a 6-month period after a
maximum one-month trial period. At the end of 6 months follow-up, all subjects will assess
the outcomes of their appointed therapy and continue with long-term use of the system.

Stimulators will be placed at the following sites to target the painful area:

- High Frequency (HF) Group: Epidural Space midline covering vertebrae levels T8 through
T11 (one stimulator placed at the top of T8 and the second stimulator placed at the
middle of T9).

- Low Frequency (LF) Group: Epidural Space covering vertebrae level determined by
paresthesia mapping for painful area.

Inclusion Criteria:

- Subject is ≥ 18 years of age at time of informed consent;

- Subjects have been diagnosed with chronic back or back and leg pain with an average
VAS > 5 (on a 10 scale) over the course of the last month for back pain based on
baseline pain diary;

- Subject diagnosis with chronic back or back and leg pain associated with FBSS
refractory to conventional medical management for at least 12 months prior to
enrollment;

- Based on the medical opinion of the Principal Investigator, subject has a stable pain
medication regiment;

- Based on the medical opinion of the Principal Investigator, there is no evidence of
anatomic abnormalities that could jeopardize the placement of the device or pose a
hazard to the subject;

- Based on the opinion of the Principal Investigator, subject is willing and able to
operate the patient programmer, recharging equipment, diary and has the ability to
undergo study assessments and provide accurate responses;

- Based on the opinion of the implanter, subject is a good surgical subject for the
implant procedure;

- Subject is willing to undergo surgical implant procedure, attend visits as scheduled,
and comply with the study requirements;

- Subject is male or non-pregnant female;

- Subject is deemed to be neuro-psycho-socially appropriate for implantation therapies
based of the assessment of a Clinical Psychologist, using face-to-face encounters and
the psychological testing described in the measures;

- Subject is capable of giving informed consent;

- Subject lives within reasonable distance from the study site (circumference of 50
miles).

Exclusion Criteria:

- Obvious mechanical instability related to pain (diagnosed by imaging taken within the
past 6 months);

- Unresolved Malignancies in last six months;

- Subject has post-herpetic neuralgia (shingles);

- Subject has an active systemic infection or is immune-compromised;

- Based on the medical opinion of the Principal Investigator, Psychologist and/or
Psychiatrist, the subject has other psychological conditions (e.g., psychosis,
suicidal ideation, borderline personality disorder, somatization, narcissism), other
health conditions (e.g., substance abuse, another chronic condition requiring the
regular use of opioid medication), or other legal concerns that would preclude his/her
enrollment in the study or potentially confound the results of the study;

- Subject is currently enrolled in or plans to enroll in any concurrent drug and/or
device study while participating in this study;

- Insulin-dependent diabetic who is not controlled through diet and/or medication
(determined by the physician) or non-insulin dependent diabetic who is not well
controlled through diet and/or medication;

- Bleeding complications or coagulopathy issues;

- Pregnant/lactating or not using adequate birth control;

- A life expectancy of less than one year;

- Any active implanted device whether turned off or on;

- A previous SCS experience;

- Conditions requiring Magnetic Resonance Imaging (MRI) evaluation or diathermy
procedures.