A nasal delivery system

Abstract

A nasal delivery system comprising a nasal insertion tube and a fluid medium located in communication with the nasal insertion tube. The nasal insertion tube comprises a tubular wall forming an internal flow path from an inlet to an outlet. The outlet is configured to be arranged in a nostril of a person to thereby facilitate an upstream flow of air in a first flow path from an ambient space through the internal flow path to the respiratory tract of the person during inhaling and a downstream flow of air in a second flow path from the respiratory tract of the person outside the internal flow path to the ambient space during exhaling. The system further comprises a flow diverter structure configured for providing a first ratio between the flow resistance in the first flow path and the flow resistance in the second flow path during upstream flow and for providing a second ratio between the flow resistance in the first flow path and the flow resistance in the second flow path during downstream flow, where the second ratio is equal to or higher than the first ratio.

Dependencies are inferred from the claim text.