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Nasal cannula

  • US 6,679,265 B2
  • Filed: 10/25/2001
  • Issued: 01/20/2004
  • Est. Priority Date: 10/25/2001
  • Status: Expired
First Claim
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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

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