Safety and Efficacy Study of the Evoke™ SCS System With Feedback vs. Conventional Stimulation

Inclusion Criteria:

- Subject is male or female between the ages of 18 and 80 years.

- Have been diagnosed with chronic, intractable pain of the trunk and/or limbs, which
has been refractory to conservative therapy for a minimum of 6 months.

- Be an appropriate candidate for an SCS trial and the surgical procedures required in
this study based on the clinical judgment of the Investigator.

- Be willing and capable of giving informed consent and able to comply with
study-related requirements, procedures, and visits.

Exclusion Criteria:

- Have a medical condition or pain in other area(s), not intended to be treated with
SCS, that could interfere with study procedures, accurate pain reporting, and/or
confound evaluation of study endpoints, as determined by the Investigator.

- Have evidence of an active disruptive psychological or psychiatric disorder or other
known condition significant enough to impact perception of pain, compliance of
intervention, and/or ability to evaluate treatment outcomes.

- Have an existing drug pump and/or SCS system or another active implantable device such
as a pacemaker, deep brain stimulator (DBS), or sacral nerve stimulator (SNS).

- Have prior experience with SCS.

- Have an active systemic infection or local infection in the area of the surgical site.

- Be pregnant or nursing (if female and sexually active, subject must be using a
reliable form of birth control, be surgically sterile, or be at least 2 years
post-menopausal).

- Be concomitantly participating in another clinical study.