Study of Safety and Efficacy for the Eustachian Tube Balloon Catheter

The primary efficacy analysis compares randomized subjects with tympanogram normalization (Types B or C normalized to Type A) in all indicated ears at 6 weeks in the investigational arm versus the control arm. Per protocol, tympanogram types are defined as follows: Type A: Peak compliance occurs between +50 and -100 daPa, with minimum peak height of 0.2ml. Indicates NORMAL middle ear function Type B: No sharp peak and a rounded line. Indicates ABNORMAL middle ear function Type C: Peak compliance occurs beyond -100 daPa. Indicates ABNORMAL middle ear function

The secondary efficacy endpoint will consist of comparison of subjects achieving at least a minimally important difference (MID) level improvement of 0.5 points on the ETDQ-7 at 6 weeks post-treatment in the investigational arm versus the proportion of subjects achieving at least an MID level improvement on the ETDQ-7 at 6 weeks post-randomization in the control arm The ETDQ-7 is a seven-item ETD specific validated quality of life survey. A mean item score of greater or equal to 2.1 indicates the presence of ETD.

Evaluation of subjects experiencing normalization of tympanometry at 12 weeks, 24 weeks, and 52 weeks post-treatment in the investigational arm and evaluation of subjects experiencing normalization of tympanometry at 12 weeks, 24 weeks, and 52 weeks post-randomization in the control arm. As MM subjects were allowed to receive a crossover procedure after their 6-week follow-up visit, there is a limited number of MM subjects who completed the 12/24/52 visits.

Evaluation of subjects achieving at least a MID level improvement of 0.5 points at 12 weeks, 24 weeks, and 52 weeks post-treatment in the investigational arm and evaluation of subjects achieving at least a MID level improvement at 12 weeks, 24 weeks, and 52 weeks post-randomization in the control arm. As MM subjects were allowed to receive a crossover procedure after their 6-week follow-up visit, there is a limited number of MM subjects who completed the 12/24/52 visits.

Evaluation of subjects' work and activity impairment before and after treatment in both the investigational arm and the control arm. The Work Productivity and Activity Impairment (WPAI) questionnaire is a 6-question patient-reported general health assessment of productivity and activity impairment. WPAI results are expressed as the percentage of impairment from 0 to 100 where higher numbers indicate greater impairment or less productivity. Due to an error in the WPAI electronic data collection form, 2 questions were not visible to many subjects resulting in a significant amount of missing data for all scores except non-work activity impairment. Therefore, only the non-work activity impairment results are presented. As MM subjects were allowed to receive a crossover procedure after their 6-week follow-up visit, there is a limited number of MM subjects who completed the 12/24/52 visits.