Propel Drug-Eluting Sinus Stent Family Open Cohort

The primary efficacy endpoint is Sino-Nasal Outcome Test 22 item (SNOT-22) total score change from baseline to Month 6. The SNOT-22 assesses 22 symptoms associated with Chronic Rhinosinusitis (CRS) with a value from 0 (no problem) to 5 (problem as bad as it can be). The total score is assessed by summing the score for each of the 22 items. Total SNOT-22 scores of 20 and greater in patients with CRS meet criteria defined by European Position Paper on Rhinosinusitis and Nasal Polyps 2020 (EPOS 2020) as indicated for Functional Endoscopic Sinus Surgery (FESS). Baseline SNOT-22 total scores are expected to be higher at baseline prior to FESS. A decrease in SNOT-22 score at 6 months would indicate improvement in the patient's CRS symptoms.

Endoscopic evaluation scoring from baseline to month 3, 6, and12. Endoscopic evaluation is the physician's assessment via endoscopy of the adhesion/scarring, polyps, patency, polypoid oedema, and middle turbinate lateralization of the sinuses from 0 (none) to 3-4 (most severe) prior to FESS, and following FESS and Propel stent placement at 3, 6 and 12 months. Lower scores at follow-up would indicate improvement in the patient's CRS and healing compared to baseline.