초록 ▼

A nasal cannula for delivering air to a patient's nares. Two delivery tubes are provided to supply air to a pair of nasal inserts each of which conform to the shape of the nare. Properly placed bleed ports reduce noise and reduce carbon dioxide retained in the system. The cannula is positioned on th

A nasal cannula for delivering air to a patient's nares. Two delivery tubes are provided to supply air to a pair of nasal inserts each of which conform to the shape of the nare. Properly placed bleed ports reduce noise and reduce carbon dioxide retained in the system. The cannula is positioned on the face with the aid of a strap system.

대표청구항 ▼

What is claimed is: 1. A nasal cannula for use with a constant positive pressure air supply, comprising:first and second nasal inserts for insertion into a patient's nares;said inserts adapted for a sealing relationship with the patient's nares;a left and a right delivery tube, each coupled to both

What is claimed is: 1. A nasal cannula for use with a constant positive pressure air supply, comprising:first and second nasal inserts for insertion into a patient's nares;said inserts adapted for a sealing relationship with the patient's nares;a left and a right delivery tube, each coupled to both of said nasal inserts, each of said delivery tubes is sufficient to provide all of the air required by the patient;a coupler located remote from said nasal inserts for coupling said cannula to a source of respiration gas;two tubular bleed ports having an internal lumen directly opening into said delivery tubes connecting an interior of the cannula with an exterior of the cannula;each of said bleed ports having a characteristic area expressed as a bleed port diameter called BPD, and separated by a distance called L;each of said tubular bleed ports located beneath each of said nasal inserts such that a first bleed port is located beneath a first insert and a second bleed port is located beneath a second insert, for preferentially intercepting expired gas during exhalation;the sum total of said bleed port diameters, called the Total Bleed Port Diameter (TBPD), have a T BPD/L ratio of between 0.1 and 0.5 such that for the two bleed ports: 0.5>2*BPD/L>0.1