Safety and Dosing Study of the CHILLS Cryotherapy for the Treatment of OSA

1. Age 25 - 65 years.
2. Diagnosed with moderate to severe OSA based on history and physical or have an established diagnosis of OSA (AHI ≥ 15 and ≤ 50) based on a prior sleep study.
3. BMI is between 28 kg/m2 and 40 kg/m2 at enrollment.
4. Negative result for COVID-19 polymerase chain reaction (RT-PCR) test and absence of clinical symptoms for COVID-19.

Exclusion Criteria:

1. Subjects with a high percentage of central apneas suggesting heart failure.
2. Contraindication to general anesthesia and MRI.
3. Metal braces, plate or pieces in the head or jaw that may interfere with MRI.
4. Craniofacial abnormality (e.g. retrognathia, micrognathia, etc.) thought to be the primary cause of OSA.
5. Obvious fixed upper airway obstructions (tumors, polyps, nasal obstruction) .
6. Tonsil size ≥ +3.
7. Previous surgery within 12 weeks of scheduled procedure performed on the soft tissue of the upper airway (e.g., uvula, soft palate or tonsils).
8. Oral cancer or non-healing oral wounds.
9. Presence of symptoms of influenza-like symptoms.
10. Contra-indicated for anesthesia or surgery.
11. History of surgery affecting the tongue (TORS, semi-glossectomy, RFBOT, MMA, HGNS).
12. History of radiation therapy to neck or upper respiratory tract
13. Surgical resection for cancer or congenital malformations in the larynx, tongue, or throat (with exception of tonsillectomy and/or adenoidectomy).
14. Clinical evidence of severe chronic obstructive or restrictive pulmonary disease (for example chronic bronchitis, emphysema, pulmonary fibrosis).
15. Active, severe pulmonary vascular disease (for example pulmonary arterial hypertension or pulmonary embolism).
16. Currently receiving treatment for severe cardiac valvular dysfunction, NYHA Class III or IV heart failure, unstable angina or recent (\< 12 month) myocardial infarction or severe cardiac arrhythmias.
17. Subjects with bleeding event, known bleeding diathesis, impaired immunity for any reason, or heart attack or stroke within the last 12 months.
18. Clinical evidence of severe renal failure (Stage 4 or 5) undergoing dialysis or expected to institute dialysis within 12 months.
19. History or current clinical evidence of TIA or stroke or muscular dysfunction.
20. Taking medications that in the opinion of the consulting physician may alter consciousness, the pattern of respiration, or sleep architecture, such examples being benzodiazepines, opiates, neuroleptics, prescription stimulants, phenothiazine, or any form of chemical substance abuse.
21. History of dementia or active psychiatric disease that may impact study compliance.
22. Females who are pregnant or females of childbearing age with intention to become pregnant during the study period (≤ 3 months from treatment date).
23. Unable and/or unwilling to comply with study requirements or to provide written informed consent.