Patent ID: 7905232
Filing Date: 2011-03-15
Classification: A61M

Abstract:
1. A nasal cannula for delivering respiratory gases to a patient's nares comprising: a gases inlet configured to engage an inspiratory conduit; a separate gases outlet configured to engage a separate expiratory conduit, a hollow manifold chamber, said gases inlet and said gases outlet in fluid communication through said manifold chamber, a pair of nasal prongs in fluid communication with said gases inlet and said gases outlet through said hollow manifold chamber, said hollow manifold chamber configured internally to limit the deadspace of said nasal cannula substantially to the volume of said prongs and further configured internally to provide a low resistance path between said gases inlet and said gases outlet such that in use a portion of said respiratory gas flows continuously directly from said gases inlet to said gases outlet, said prongs juxtaposed directly in said low resistance path, each of said prongs spaced equidistant from said gases inlet such that said respiratory gas is available to each of said prongs simultaneously, and each of said prongs spaced equidistant from said gases outlet such that the potential for rebreathing expired gases is reduced.