Safety and Efficacy of Vagus Nerve Stimulator in Patients With Rheumatoid Arthritis (RA)

1. Male or female and 22-75 years of age, inclusive
2. Have provided informed consent
3. Have a diagnosis of adult-onset rheumatoid arthritis as defined by the 2010 ACR/EULAR classification criteria (Aletaha, 2010)
4. Have moderately to severely active RA defined by at least 4/28 tender and 4/28 swollen joints and CDAI score >10

5. Have been treated at approved doses with at least 2 biologic DMARDs and/or new targeted synthetic DMARDs (e.g. JAK inhibition) for at least 3 months and either:

   1. experienced insufficient efficacy or loss of efficacy
   2. experienced intolerance of such treatment
6. Have had regular use of at least 1 conventional DMARDs for at least the 12 weeks prior to study entry with a continuous, non-changing dose for at least 8 weeks prior to screening visit
7. Women of childbearing potential must not be pregnant at the time of screening and must agree to use a double barrier method of contraception throughout the study

Exclusion Criteria:

1. Have taken the following within the defined time period prior to screening visit:

   i. Rituximab: 6 months ii. Infliximab, golimumab, adalimumab, certolizumab pegol, tocilizumab: 60 days iii. Abatacept, etanercept, anakinra: 30 days iv. Tofacitinib: 30 days v. Investigational biologic agents: 6 months for depleting agents, 60 days for others vi. Investigational small molecules: 5 times the pharmacokinetic half-life or 30 days, whichever is longer vii. Intra-articular corticosteroid injection: 30 days

2. Are currently receiving corticosteroids at doses greater than 10 mg per day of prednisone (or equivalent) or have been receiving an unstable dosing regimen of corticosteroids within 2 weeks of screening visit
3. Have started treatment with non-steroidal anti-inflammatory drugs (NSAIDs) or have been receiving an unstable dosing regimen of NSAIDs within 2 weeks of screening visit
4. Documented significant psychiatric illness or substance abuse
5. Active infection requiring treatment with antibiotics
6. Uncontrolled hypertension
7. Uncontrolled diabetes
8. History of stroke
9. Known cardiac disease, including cardiomyopathy with ejection fraction \<40%, recent myocardial infarction or unstable angina, or heart failure with New York Heart Association class III or IV symptoms
10. Known neurological syndromes
11. Known atherosclerotic disease including contralateral carotid artery
12. BMI \<18.5 or >35
13. Any condition per the investigator's clinical judgment that precludes participation in the study