Nasal interface

摘要

A nasal cannula for use in a system for providing a flow of respiratory gases to a user is described. The nasal cannula comprises a body made from a pliable material. The body has an inlet and at least one nasal prong fluidly connected to the inlet. In use a conduit providing a flow of gases to the cannula is connected to the inlet, and the nasal prong is inserted into a user's nostril. The cannula is arranged to direct the flow of gases from the nasal prong towards the front wall of the user's nasal passage within the user's nose.

主权项

1. A nasal interface configured to provide a flow of respiratory gases to a user in use, the nasal interface comprising:
a headgear including a strap configured to support the nasal interface against a user in use; and a nasal cannula assembly including a nasal cannula body and a frame that provides support to the nasal cannula assembly, the nasal cannula assembly comprising:
first and second nasal prongs, each of the first and second nasal prongs configured to extend into a user's nostril in use;a manifold including an inlet connected to a conduit configured to provide respiratory gases to the inlet, the manifold connecting the inlet to the first and second nasal prongs such that gases flow from the conduit, into the nasal cannula body through the inlet, and through the manifold to exit each of the first and second nasal prongs to enter the user's nostrils;first and second side arms extending from first and second lateral sides of the nasal cannula assembly;a bridging portion extending between and connected to the first and second side arms;an expiratory flow passage defining an expiratory flow direction with a cross sectional shape transverse to the expiratory flow direction, the expiratory flow passage defined between the bridging portion and the inlet, the cross sectional shape of the expiratory flow passage having at least first, second, and third sides, the first side defined by the inlet and being concave, the second and third sides having straight portions adjacent to the first side; anda filter material disposed in the expiratory flow passage.