Study to Evaluate the Efficacy of Intranasal Kinetic Oscillation Stimulation in the Preventive Treatment of Chronic Migraine

This is a randomized, placebo-controlled, double-blind, multicenter clinical investigation of a medical device. The study consists of a 4-week screening period, a 6-week treatment period (2 weeks run-in and a 4-week observation window to assess the treatment effect), and a 4-week follow-up period. The study primarily aims at evaluating the effect of intranasal kinetic oscillation stimulation using the Chordate System S211 as a preventative treatment on monthly headache days with moderate to severe intensity.