Observational StudyPediatric Down Syndrome Post-Approval Study

Inclusion Criteria:

1. Patient has been diagnosed with Down syndrome;
2. Patient is 13-18 years of age;
3. Patient has been diagnosed with severe obstructive sleep apnea, with an AHI of ≥ 10 and ≤ 50 based on a recent (within 6 months of enrollment) qualified in-lab sleep study (PSG);
4. Patient has documented failure of, or intolerance to, positive airway pressure therapies (such as CPAP or BiPAP) despite attempts to improve compliance;
5. Patient is contraindicated for, or not effectively treated by, adenotonsillectomy;
6. Treatment of patient's OSA has followed standard of care in considering all other alternative/adjunctive therapies;
7. Patient, and their parents/guardians, is willing to have stimulation hardware permanently implanted, and be willing to participate in follow-up visits, postoperative in-lab sleep studies (PSGs), and questionnaire completion.

Exclusion Criteria:

1. Patient's recent PSG (within 6 months of enrollment) reports central + mixed apneas > 25% of the total apnea-hypopnea index (AHI);
2. Patient has any anatomical finding that would compromise the performance of upper airway stimulation, such as the presence of complete concentric collapse of the soft palate;
3. Patient has any condition or procedure that has compromised neurological control of the upper airway;
4. Patient, or their parent/guardian, is unable or does not have the necessary assistance to operate the patient remote;
5. Patient is pregnant or plans to become pregnant;
6. Patient has an implantable device that may be susceptible to unintended interaction with the Inspire system;
7. Patient will require magnetic resonance imaging (MRI) other than what is specified in the MR conditional labeling;
8. Patient has a terminal illness with life expectancy of less than 12 months;
9. Any other reason the investigator deems the patient is unfit for participation in the study.