Nasal cannula
First Claim
Patent Images
1. A nasal cannula comprising:
- first and second nasal inserts positioned on the nasal cannula with no indentation between the first and second nasal inserts for insertion into a patient'"'"'s nares;
whereby the area of each insert and the area of the nare are essentially equal so that a positive air pressure seal is created between the nare and the insert;
a first delivery tube and a second delivery tube, each coupled to both of said nasal inserts, whereby each nasal insert communicates with both the first delivery tube and second delivery tube;
a coupler located remote from said nasal inserts for coupling said cannula to said source of respiration gas; and
at least one bleed port positioned proximate a nasal insert communicating with said delivery tubes, having an opening flush with the exterior of the nasal cannula that is directly open to atmospheric pressure and having an internal height less than ten times the thickness of the delivery tube at the location of the bleed port.
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Abstract
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.
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Citations
20 Claims
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1. A nasal cannula comprising:
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first and second nasal inserts positioned on the nasal cannula with no indentation between the first and second nasal inserts for insertion into a patient'"'"'s nares;
whereby the area of each insert and the area of the nare are essentially equal so that a positive air pressure seal is created between the nare and the insert;a first delivery tube and a second delivery tube, each coupled to both of said nasal inserts, whereby each nasal insert communicates with both the first delivery tube and second delivery tube; a coupler located remote from said nasal inserts for coupling said cannula to said source of respiration gas; and at least one bleed port positioned proximate a nasal insert communicating with said delivery tubes, having an opening flush with the exterior of the nasal cannula that is directly open to atmospheric pressure and having an internal height less than ten times the thickness of the delivery tube at the location of the bleed port. - View Dependent Claims (2, 3, 4, 5)
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6. A nasal comprising:
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two nasal inserts positioned on the nasal cannula with no indentation between the first and second nasal inserts for insertion into a patient'"'"'s nares, each insert having a flange member at is terminal end for sealing against said nare against the positive air pressures; a first delivery tube and a second delivery tube meeting together proximate the nares forming plenum, having a plenum volume; and one or more bleed ports directly inline with said nasal insert and having an opening flush with the exterior of the nasal cannula and an internal lumen having a height less than ten times the thickness of the delivery tube at the location of the bleed port providing unrestricted gas exchange with the environment;
each bleed port having a characteristic diameter, selected depending on the plenum volume and the flow introduced into the nasal cannula to provide a CO2 concentration to the nasal inserts of below approximately 0.5%. - View Dependent Claims (7, 8, 9, 10)
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11. A nasal cannula, comprising:
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a first nasal insert and a second nasal insert designed to be inserted and form a seal in the nares of a patient, the area disposed between the first nasal insert and the second nasal insert is not indented; a first delivery tube and a second delivery tube each coupled to both the first nasal insert and the second nasal insert; a coupler for coupling the nasal cannula to a source of respiration gas; and at least one bleed port positioned proximate a nasal insert having an opening flush with the exterior of the nasal cannula and an internal height less than ten times the thickness of the delivery tube at the location of the bleed port. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification